6c2fbcb80e
This test (prior tot his commit) works fine. However, something about running it with riak `make test` causes it to fail. The process crashes when the file:delete(F2) is called. As the test works in isolation on R16, and also because aprocess crashing in the real world in this stage would not be the end of the world (this whole part was added as a way of dealing with some unlikely but possible tidy-up scenarios in eqc tests), losing the test in R16 is tolerable. So In R16 tests (which includes riak make test), the delete will no longer be called in this test.
2657 lines
101 KiB
Erlang
2657 lines
101 KiB
Erlang
%% -------- CDB File Clerk ---------
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%%
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%% This is a modified version of the cdb module provided by Tom Whitcomb.
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%%
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%% - https://github.com/thomaswhitcomb/erlang-cdb
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%%
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%% The CDB module is an implementation of the constant database format
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%% described by DJ Bernstein
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%%
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%% - https://cr.yp.to/cdb.html
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%%
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%% The primary differences are:
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%% - Support for incrementally writing a CDB file while keeping the hash table
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%% in memory
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%% - The ability to scan a database in blocks of sequence numbers
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%% - The applictaion of a CRC check by default to all values
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%%
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%% Because of the final delta - this is incompatible with standard CDB files
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%% (in that you won't be able to fetch values if the file was written by
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%% another CDB writer as the CRC check is missing)
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%%
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%% This module provides functions to create and query a CDB (constant database).
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%% A CDB implements a two-level hashtable which provides fast {key,value}
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%% lookups that remain fairly constant in speed regardless of the CDBs size.
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%%
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%% The first level in the CDB occupies the first 255 doublewords in the file.
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%% Each doubleword slot contains two values. The first is a file pointer to
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%% the primary hashtable (at the end of the file) and the second value is the
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%% number of entries in the hashtable. The first level table of 255 entries
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%% is indexed with the lower eight bits of the hash of the input key.
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%%
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%% Following the 255 doublewords are the {key,value} tuples. The tuples are
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%% packed in the file without regard to word boundaries. Each {key,value}
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%% tuple is represented with a four byte key length, a four byte value length,
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%% the actual key value followed by the actual value.
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%%
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%% Following the {key,value} tuples are the primary hash tables. There are
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%% at most 255 hash tables. Each hash table is referenced by one of the 255
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%% doubleword entries at the top of the file. For efficiency reasons, each
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%% hash table is allocated twice the number of entries that it will need.
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%% Each entry in the hash table is a doubleword.
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%% The first word is the corresponding hash value and the second word is a
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%% file pointer to the actual {key,value} tuple higher in the file.
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%%
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%%
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-module(leveled_cdb).
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-behaviour(gen_fsm).
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-include("include/leveled.hrl").
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-ifdef(fsm_deprecated).
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-compile({nowarn_deprecated_function,
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[{gen_fsm, start_link, 3},
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{gen_fsm, sync_send_event, 3},
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{gen_fsm, sync_send_event, 2},
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{gen_fsm, send_event, 2},
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{gen_fsm, sync_send_all_state_event, 3},
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{gen_fsm, send_all_state_event, 2}]}).
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-endif.
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-ifdef(slow_test).
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-define(KEYCOUNT, 2048).
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-define(SPECIAL_DELFUN, fun(_F) -> ok end).
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% There are problems with the pendingdelete_test/0 in riak make test
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% The deletion of the file causes the process to crash and the test to
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% fail, but thisis not an issue tetsing outside of riak make test.
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% Workaround this problem by not performing the delete when running unit
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% tests in R16
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-else.
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-define(KEYCOUNT, 16384).
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-define(SPECIAL_DELFUN, fun(F) -> file:delete(F) end).
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-endif.
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-export([init/1,
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handle_sync_event/4,
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handle_event/3,
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handle_info/3,
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terminate/3,
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code_change/4,
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starting/3,
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writer/3,
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writer/2,
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rolling/2,
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rolling/3,
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reader/3,
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reader/2,
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delete_pending/3,
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delete_pending/2]).
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-export([cdb_open_writer/1,
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cdb_open_writer/2,
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cdb_open_reader/1,
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cdb_open_reader/2,
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cdb_reopen_reader/3,
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cdb_get/2,
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cdb_put/3,
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cdb_mput/2,
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cdb_getpositions/2,
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cdb_directfetch/3,
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cdb_lastkey/1,
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cdb_firstkey/1,
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cdb_filename/1,
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cdb_keycheck/2,
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cdb_scan/4,
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cdb_close/1,
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cdb_complete/1,
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cdb_roll/1,
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cdb_returnhashtable/3,
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cdb_checkhashtable/1,
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cdb_destroy/1,
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cdb_deletepending/1,
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cdb_deletepending/3,
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cdb_isrolling/1]).
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-export([finished_rolling/1,
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hashtable_calc/2]).
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-include_lib("eunit/include/eunit.hrl").
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-define(DWORD_SIZE, 8).
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-define(WORD_SIZE, 4).
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-define(MAX_FILE_SIZE, 3221225472).
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-define(BINARY_MODE, false).
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-define(BASE_POSITION, 2048).
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-define(WRITE_OPS, [binary, raw, read, write]).
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-define(PENDING_ROLL_WAIT, 30).
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-define(DELETE_TIMEOUT, 10000).
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-define(TIMING_SAMPLECOUNTDOWN, 1000).
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-define(TIMING_SAMPLESIZE, 100).
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-define(MAX_OBJECT_SIZE, 1000000000).
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% 1GB but really should be much smaller than this
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-record(state, {hashtree,
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last_position :: integer() | undefined,
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last_key = empty,
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hash_index = {} :: tuple(),
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filename :: string() | undefined,
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handle :: file:fd() | undefined,
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max_size :: integer() | undefined,
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binary_mode = false :: boolean(),
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delete_point = 0 :: integer(),
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inker :: pid() | undefined,
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deferred_delete = false :: boolean(),
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waste_path :: string() | undefined,
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sync_strategy = none,
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timings = no_timing :: cdb_timings(),
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timings_countdown = 0 :: integer(),
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log_options = leveled_log:get_opts()
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:: leveled_log:log_options()}).
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-record(cdb_timings, {sample_count = 0 :: integer(),
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sample_cyclecount = 0 :: integer(),
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sample_indextime = 0 :: integer(),
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sample_fetchtime = 0 :: integer(),
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fetchloop_starttime :: undefined|erlang:timestamp()}).
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-type cdb_options() :: #cdb_options{}.
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-type cdb_timings() :: no_timing|#cdb_timings{}.
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-type hashtable_index() :: tuple().
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-type file_location() :: integer()|eof.
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%%%============================================================================
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%%% API
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%%%============================================================================
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-spec cdb_open_writer(string()) -> {ok, pid()}.
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%% @doc
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%% Open a file for writing using default options
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cdb_open_writer(Filename) ->
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%% No options passed
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cdb_open_writer(Filename, #cdb_options{binary_mode=true}).
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-spec cdb_open_writer(string(), cdb_options()) -> {ok, pid()}.
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%% @doc
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%% The filename should be a full file system reference to an existing CDB
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%% file, and it will be opened and a FSM started to manage the file - with the
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%% hashtree cached in memory (the file will need to be scanned to build the
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%% hashtree)
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cdb_open_writer(Filename, Opts) ->
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{ok, Pid} = gen_fsm:start_link(?MODULE, [Opts], []),
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ok = gen_fsm:sync_send_event(Pid, {open_writer, Filename}, infinity),
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{ok, Pid}.
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-spec cdb_reopen_reader(string(), binary(), cdb_options()) -> {ok, pid()}.
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%% @doc
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%% Open an existing file that has already been moved into read-only mode. The
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%% LastKey should be known, as it has been stored in the manifest. Knowing the
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%% LastKey stops the file from needing to be scanned on start-up to discover
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%% the LastKey.
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%%
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%% The LastKey is the Key of the last object added to the file - and is used to
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%% determine when scans over a file have completed.
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cdb_reopen_reader(Filename, LastKey, CDBopts) ->
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{ok, Pid} =
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gen_fsm:start_link(?MODULE,
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[CDBopts#cdb_options{binary_mode=true}],
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[]),
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ok = gen_fsm:sync_send_event(Pid,
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{open_reader, Filename, LastKey},
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infinity),
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{ok, Pid}.
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-spec cdb_open_reader(string()) -> {ok, pid()}.
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%% @doc
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%% Open an existing file that has already been moved into read-only mode.
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%% Don't use this if the LastKey is known, as this requires an expensive scan
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%% to discover the LastKey.
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cdb_open_reader(Filename) ->
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cdb_open_reader(Filename, #cdb_options{binary_mode=true}).
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-spec cdb_open_reader(string(), #cdb_options{}) -> {ok, pid()}.
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%% @doc
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%% Open an existing file that has already been moved into read-only mode.
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%% Don't use this if the LastKey is known, as this requires an expensive scan
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%% to discover the LastKey.
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%% Allows non-default cdb_options to be passed
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cdb_open_reader(Filename, Opts) ->
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{ok, Pid} = gen_fsm:start_link(?MODULE, [Opts], []),
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ok = gen_fsm:sync_send_event(Pid, {open_reader, Filename}, infinity),
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{ok, Pid}.
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-spec cdb_get(pid(), any()) -> {any(), any()}|missing.
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%% @doc
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%% Extract a Key and Value from a CDB file by passing in a Key.
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cdb_get(Pid, Key) ->
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gen_fsm:sync_send_event(Pid, {get_kv, Key}, infinity).
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-spec cdb_put(pid(), any(), any()) -> ok|roll.
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%% @doc
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%% Put a key and value into a cdb file that is open as a writer, will fail
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%% if the FSM is in any other state.
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%%
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%% Response can be roll - if there is no space to put this value in the file.
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%% It is assumed that the response to a "roll" will be to roll the file, which
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%% will close this file for writing after persisting the hashtree.
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cdb_put(Pid, Key, Value) ->
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gen_fsm:sync_send_event(Pid, {put_kv, Key, Value}, infinity).
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-spec cdb_mput(pid(), list()) -> ok|roll.
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%% @doc
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%% Add multiple keys and values in one call. The file will request a roll if
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%% all of the keys and values cnanot be written (and in this case none of them
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%% will). Mput is an all_or_nothing operation.
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%%
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%% It may be preferable to respond to roll by trying individual PUTs until
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%% roll is returned again
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cdb_mput(Pid, KVList) ->
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gen_fsm:sync_send_event(Pid, {mput_kv, KVList}, infinity).
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-spec cdb_getpositions(pid(), integer()|all) -> list().
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%% @doc
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%% Get the positions in the file of a random sample of Keys. cdb_directfetch
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%% can then be used to fetch those keys. SampleSize can be an integer or the
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%% atom all. To be used for sampling queries, for example to assess the
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%% potential for compaction.
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cdb_getpositions(Pid, SampleSize) ->
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% Getting many positions from the index, especially getting all positions
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% can take time (about 1s for all positions). Rather than queue all
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% requests waiting for this to complete, loop over each of the 256 indexes
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% outside of the FSM processing loop - to allow for other messages to be
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% interleaved
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case SampleSize of
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all ->
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FoldFun =
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fun(Index, Acc) ->
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cdb_getpositions_fromidx(Pid, all, Index, Acc)
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end,
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IdxList = lists:seq(0, 255),
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lists:foldl(FoldFun, [], IdxList);
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S0 ->
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FoldFun =
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fun({_R, Index}, Acc) ->
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case length(Acc) of
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S0 ->
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Acc;
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L when L < S0 ->
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cdb_getpositions_fromidx(Pid, S0, Index, Acc)
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end
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end,
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RandFun = fun(X) -> {leveled_rand:uniform(), X} end,
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SeededL = lists:map(RandFun, lists:seq(0, 255)),
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SortedL = lists:keysort(1, SeededL),
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lists:foldl(FoldFun, [], SortedL)
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end.
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cdb_getpositions_fromidx(Pid, SampleSize, Index, Acc) ->
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gen_fsm:sync_send_event(Pid, {get_positions, SampleSize, Index, Acc}).
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-spec cdb_directfetch(pid(), list(), key_only|key_size|key_value_check) ->
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list().
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%% @doc
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%% Info can be key_only, key_size (size being the size of the value) or
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%% key_value_check (with the check part indicating if the CRC is correct for
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%% the value)
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cdb_directfetch(Pid, PositionList, Info) ->
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gen_fsm:sync_send_event(Pid, {direct_fetch, PositionList, Info}, infinity).
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-spec cdb_close(pid()) -> ok.
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%% @doc
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%% RONSEAL
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cdb_close(Pid) ->
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gen_fsm:sync_send_all_state_event(Pid, cdb_close, infinity).
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-spec cdb_complete(pid()) -> {ok, string()}.
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%% @doc
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%% Persists the hashtable to the end of the file, to close it for further
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%% writing then exit. Returns the filename that was saved.
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cdb_complete(Pid) ->
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gen_fsm:sync_send_event(Pid, cdb_complete, infinity).
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-spec cdb_roll(pid()) -> ok.
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%% @doc
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%% Persists the hashtable to the end of the file, to close it for further
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%% writing but do not exit, this will continue to service requests in the
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%% rolling state whilst the hashtable is being written, and will become a
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%% reader (read-only) CDB file process on completion
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cdb_roll(Pid) ->
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gen_fsm:send_event(Pid, cdb_roll).
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-spec cdb_returnhashtable(pid(), list(), binary()) -> ok.
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%% @doc
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%% Used for handling the return of a calulcated hashtable from a spawnded
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%% process - the building of the hashtable should not block the servicing of
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%% requests. Returned is the binary for writing and the IndexList
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%% [{Index, CurrPos, IndexLength}] which can be used to locate the slices of
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%% the hashtree within that binary
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cdb_returnhashtable(Pid, IndexList, HashTreeBin) ->
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gen_fsm:sync_send_event(Pid, {return_hashtable, IndexList, HashTreeBin}, infinity).
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-spec cdb_checkhashtable(pid()) -> boolean().
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%% @doc
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%% Hash the hashtable been written for this file?
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cdb_checkhashtable(Pid) ->
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gen_fsm:sync_send_event(Pid, check_hashtable).
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-spec cdb_destroy(pid()) -> ok.
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%% @doc
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%% If the file is in a delete_pending state close (and will destroy)
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cdb_destroy(Pid) ->
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gen_fsm:send_event(Pid, destroy).
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cdb_deletepending(Pid) ->
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% Only used in unit tests
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cdb_deletepending(Pid, 0, no_poll).
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|
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-spec cdb_deletepending(pid(), integer(), pid()|no_poll) -> ok.
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%% @doc
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%% Puts the file in a delete_pending state. From that state the Inker will be
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%% polled to discover if the Manifest SQN at which the file is deleted now
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%% means that the file can safely be destroyed (as there are no snapshots with
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%% any outstanding dependencies).
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%% Passing no_poll means there's no inker to poll, and the process will close
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%% on timeout rather than poll.
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cdb_deletepending(Pid, ManSQN, Inker) ->
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gen_fsm:send_event(Pid, {delete_pending, ManSQN, Inker}).
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-spec cdb_scan(pid(), fun(), any(), integer()|undefined) ->
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{integer()|eof, any()}.
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%% @doc
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%% cdb_scan returns {LastPosition, Acc}. Use LastPosition as StartPosiiton to
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%% continue from that point (calling function has to protect against) double
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%% counting.
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%%
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%% LastPosition could be the atom complete when the last key processed was at
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%% the end of the file. last_key must be defined in LoopState.
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cdb_scan(Pid, FilterFun, InitAcc, StartPosition) ->
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gen_fsm:sync_send_all_state_event(Pid,
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{cdb_scan,
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FilterFun,
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InitAcc,
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StartPosition},
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infinity).
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|
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-spec cdb_lastkey(pid()) -> any().
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%% @doc
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%% Get the last key to be added to the file (which will have the highest
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%% sequence number)
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cdb_lastkey(Pid) ->
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gen_fsm:sync_send_all_state_event(Pid, cdb_lastkey, infinity).
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|
|
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-spec cdb_firstkey(pid()) -> any().
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cdb_firstkey(Pid) ->
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gen_fsm:sync_send_all_state_event(Pid, cdb_firstkey, infinity).
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|
|
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-spec cdb_filename(pid()) -> string().
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%% @doc
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%% Get the filename of the database
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cdb_filename(Pid) ->
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gen_fsm:sync_send_all_state_event(Pid, cdb_filename, infinity).
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|
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-spec cdb_keycheck(pid(), any()) -> probably|missing.
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%% @doc
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%% Check to see if the key is probably present, will return either
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%% probably or missing. Does not do a definitive check
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cdb_keycheck(Pid, Key) ->
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gen_fsm:sync_send_event(Pid, {key_check, Key}, infinity).
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|
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-spec cdb_isrolling(pid()) -> boolean().
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%% @doc
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%% Check to see if a cdb file is still rolling
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cdb_isrolling(Pid) ->
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gen_fsm:sync_send_all_state_event(Pid, cdb_isrolling, infinity).
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|
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%%%============================================================================
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%%% gen_server callbacks
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%%%============================================================================
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init([Opts]) ->
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MaxSize = case Opts#cdb_options.max_size of
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undefined ->
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?MAX_FILE_SIZE;
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M ->
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M
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end,
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{ok,
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starting,
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#state{max_size=MaxSize,
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binary_mode=Opts#cdb_options.binary_mode,
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waste_path=Opts#cdb_options.waste_path,
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sync_strategy=Opts#cdb_options.sync_strategy,
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log_options=Opts#cdb_options.log_options}}.
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|
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starting({open_writer, Filename}, _From, State) ->
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leveled_log:save(State#state.log_options),
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leveled_log:log("CDB01", [Filename]),
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{LastPosition, HashTree, LastKey} = open_active_file(Filename),
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{WriteOps, UpdStrategy} = set_writeops(State#state.sync_strategy),
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leveled_log:log("CDB13", [WriteOps]),
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{ok, Handle} = file:open(Filename, WriteOps),
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{reply, ok, writer, State#state{handle=Handle,
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sync_strategy = UpdStrategy,
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last_position=LastPosition,
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last_key=LastKey,
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filename=Filename,
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hashtree=HashTree}};
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starting({open_reader, Filename}, _From, State) ->
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leveled_log:save(State#state.log_options),
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leveled_log:log("CDB02", [Filename]),
|
|
{Handle, Index, LastKey} = open_for_readonly(Filename, false),
|
|
{reply, ok, reader, State#state{handle=Handle,
|
|
last_key=LastKey,
|
|
filename=Filename,
|
|
hash_index=Index}};
|
|
starting({open_reader, Filename, LastKey}, _From, State) ->
|
|
leveled_log:save(State#state.log_options),
|
|
leveled_log:log("CDB02", [Filename]),
|
|
{Handle, Index, LastKey} = open_for_readonly(Filename, LastKey),
|
|
{reply, ok, reader, State#state{handle=Handle,
|
|
last_key=LastKey,
|
|
filename=Filename,
|
|
hash_index=Index}}.
|
|
|
|
writer({get_kv, Key}, _From, State) ->
|
|
{reply,
|
|
get_mem(Key,
|
|
State#state.handle,
|
|
State#state.hashtree,
|
|
State#state.binary_mode),
|
|
writer,
|
|
State};
|
|
writer({key_check, Key}, _From, State) ->
|
|
{reply,
|
|
get_mem(Key,
|
|
State#state.handle,
|
|
State#state.hashtree,
|
|
State#state.binary_mode,
|
|
loose_presence),
|
|
writer,
|
|
State};
|
|
writer({put_kv, Key, Value}, _From, State) ->
|
|
Result = put(State#state.handle,
|
|
Key,
|
|
Value,
|
|
{State#state.last_position, State#state.hashtree},
|
|
State#state.binary_mode,
|
|
State#state.max_size,
|
|
State#state.last_key == empty),
|
|
case Result of
|
|
roll ->
|
|
%% Key and value could not be written
|
|
{reply, roll, writer, State};
|
|
{UpdHandle, NewPosition, HashTree} ->
|
|
ok =
|
|
case State#state.sync_strategy of
|
|
riak_sync ->
|
|
file:datasync(UpdHandle);
|
|
_ ->
|
|
ok
|
|
end,
|
|
{reply, ok, writer, State#state{handle=UpdHandle,
|
|
last_position=NewPosition,
|
|
last_key=Key,
|
|
hashtree=HashTree}}
|
|
end;
|
|
writer({mput_kv, []}, _From, State) ->
|
|
{reply, ok, writer, State};
|
|
writer({mput_kv, KVList}, _From, State) ->
|
|
Result = mput(State#state.handle,
|
|
KVList,
|
|
{State#state.last_position, State#state.hashtree},
|
|
State#state.binary_mode,
|
|
State#state.max_size),
|
|
case Result of
|
|
roll ->
|
|
%% Keys and values could not be written
|
|
{reply, roll, writer, State};
|
|
{UpdHandle, NewPosition, HashTree, LastKey} ->
|
|
{reply, ok, writer, State#state{handle=UpdHandle,
|
|
last_position=NewPosition,
|
|
last_key=LastKey,
|
|
hashtree=HashTree}}
|
|
end;
|
|
writer(cdb_complete, _From, State) ->
|
|
NewName = determine_new_filename(State#state.filename),
|
|
ok = close_file(State#state.handle,
|
|
State#state.hashtree,
|
|
State#state.last_position),
|
|
ok = rename_for_read(State#state.filename, NewName),
|
|
{stop, normal, {ok, NewName}, State}.
|
|
|
|
writer(cdb_roll, State) ->
|
|
ok = leveled_iclerk:clerk_hashtablecalc(State#state.hashtree,
|
|
State#state.last_position,
|
|
self()),
|
|
{next_state, rolling, State}.
|
|
|
|
|
|
rolling({get_kv, Key}, _From, State) ->
|
|
{reply,
|
|
get_mem(Key,
|
|
State#state.handle,
|
|
State#state.hashtree,
|
|
State#state.binary_mode),
|
|
rolling,
|
|
State};
|
|
rolling({key_check, Key}, _From, State) ->
|
|
{reply,
|
|
get_mem(Key,
|
|
State#state.handle,
|
|
State#state.hashtree,
|
|
State#state.binary_mode,
|
|
loose_presence),
|
|
rolling,
|
|
State};
|
|
rolling({get_positions, _SampleSize, _Index, SampleAcc}, _From, State) ->
|
|
{reply, SampleAcc, rolling, State};
|
|
rolling({return_hashtable, IndexList, HashTreeBin}, _From, State) ->
|
|
SW = os:timestamp(),
|
|
Handle = State#state.handle,
|
|
{ok, BasePos} = file:position(Handle, State#state.last_position),
|
|
NewName = determine_new_filename(State#state.filename),
|
|
ok = perform_write_hash_tables(Handle, HashTreeBin, BasePos),
|
|
ok = write_top_index_table(Handle, BasePos, IndexList),
|
|
file:close(Handle),
|
|
ok = rename_for_read(State#state.filename, NewName),
|
|
leveled_log:log("CDB03", [NewName]),
|
|
ets:delete(State#state.hashtree),
|
|
{NewHandle, Index, LastKey} = open_for_readonly(NewName,
|
|
State#state.last_key),
|
|
case State#state.deferred_delete of
|
|
true ->
|
|
{reply, ok, delete_pending, State#state{handle=NewHandle,
|
|
last_key=LastKey,
|
|
filename=NewName,
|
|
hash_index=Index}};
|
|
false ->
|
|
leveled_log:log_timer("CDB18", [], SW),
|
|
{reply, ok, reader, State#state{handle=NewHandle,
|
|
last_key=LastKey,
|
|
filename=NewName,
|
|
hash_index=Index}}
|
|
end;
|
|
rolling(check_hashtable, _From, State) ->
|
|
{reply, false, rolling, State}.
|
|
|
|
rolling({delete_pending, ManSQN, Inker}, State) ->
|
|
{next_state,
|
|
rolling,
|
|
State#state{delete_point=ManSQN, inker=Inker, deferred_delete=true}}.
|
|
|
|
reader({get_kv, Key}, _From, State) ->
|
|
{UpdTimings, Result} =
|
|
get_withcache(State#state.handle,
|
|
Key,
|
|
State#state.hash_index,
|
|
State#state.binary_mode,
|
|
State#state.timings),
|
|
{UpdTimings0, CountDown} =
|
|
update_statetimings(UpdTimings, State#state.timings_countdown),
|
|
{reply,
|
|
Result,
|
|
reader,
|
|
State#state{timings = UpdTimings0, timings_countdown = CountDown}};
|
|
reader({key_check, Key}, _From, State) ->
|
|
{no_timing, Result} =
|
|
get_withcache(State#state.handle,
|
|
Key,
|
|
State#state.hash_index,
|
|
loose_presence,
|
|
State#state.binary_mode,
|
|
no_timing),
|
|
{reply, Result, reader, State};
|
|
reader({get_positions, SampleSize, Index, Acc}, _From, State) ->
|
|
{Pos, Count} = element(Index + 1, State#state.hash_index),
|
|
UpdAcc = scan_index_returnpositions(State#state.handle, Pos, Count, Acc),
|
|
case SampleSize of
|
|
all ->
|
|
{reply, UpdAcc, reader, State};
|
|
_ ->
|
|
{reply, lists:sublist(UpdAcc, SampleSize), reader, State}
|
|
end;
|
|
reader({direct_fetch, PositionList, Info}, _From, State) ->
|
|
H = State#state.handle,
|
|
FilterFalseKey = fun(Tpl) -> case element(1, Tpl) of
|
|
false ->
|
|
false;
|
|
_Key ->
|
|
{true, Tpl}
|
|
end end,
|
|
Reply =
|
|
case Info of
|
|
key_only ->
|
|
FM = lists:filtermap(
|
|
fun(P) ->
|
|
FilterFalseKey(extract_key(H, P)) end,
|
|
PositionList),
|
|
lists:map(fun(T) -> element(1, T) end, FM);
|
|
key_size ->
|
|
lists:filtermap(
|
|
fun(P) ->
|
|
FilterFalseKey(extract_key_size(H, P)) end,
|
|
PositionList);
|
|
key_value_check ->
|
|
BM = State#state.binary_mode,
|
|
lists:map(fun(P) -> extract_key_value_check(H, P, BM) end,
|
|
PositionList)
|
|
end,
|
|
{reply, Reply, reader, State};
|
|
reader(cdb_complete, _From, State) ->
|
|
leveled_log:log("CDB05", [State#state.filename, reader, cdb_ccomplete]),
|
|
ok = file:close(State#state.handle),
|
|
{stop, normal, {ok, State#state.filename}, State#state{handle=undefined}};
|
|
reader(check_hashtable, _From, State) ->
|
|
{reply, true, reader, State}.
|
|
|
|
|
|
reader({delete_pending, 0, no_poll}, State) ->
|
|
{next_state,
|
|
delete_pending,
|
|
State#state{delete_point=0}};
|
|
reader({delete_pending, ManSQN, Inker}, State) ->
|
|
{next_state,
|
|
delete_pending,
|
|
State#state{delete_point=ManSQN, inker=Inker},
|
|
?DELETE_TIMEOUT}.
|
|
|
|
|
|
delete_pending({get_kv, Key}, _From, State) ->
|
|
{UpdTimings, Result} =
|
|
get_withcache(State#state.handle,
|
|
Key,
|
|
State#state.hash_index,
|
|
State#state.binary_mode,
|
|
State#state.timings),
|
|
{UpdTimings0, CountDown} =
|
|
update_statetimings(UpdTimings, State#state.timings_countdown),
|
|
{reply,
|
|
Result,
|
|
delete_pending,
|
|
State#state{timings = UpdTimings0, timings_countdown = CountDown},
|
|
?DELETE_TIMEOUT};
|
|
delete_pending({key_check, Key}, _From, State) ->
|
|
{no_timing, Result} =
|
|
get_withcache(State#state.handle,
|
|
Key,
|
|
State#state.hash_index,
|
|
loose_presence,
|
|
State#state.binary_mode,
|
|
no_timing),
|
|
{reply, Result, delete_pending, State, ?DELETE_TIMEOUT}.
|
|
|
|
delete_pending(timeout, State=#state{delete_point=ManSQN}) when ManSQN > 0 ->
|
|
case is_process_alive(State#state.inker) of
|
|
true ->
|
|
case leveled_inker:ink_confirmdelete(State#state.inker, ManSQN) of
|
|
true ->
|
|
leveled_log:log("CDB04", [State#state.filename, ManSQN]),
|
|
close_pendingdelete(State#state.handle,
|
|
State#state.filename,
|
|
State#state.waste_path),
|
|
{stop, normal, State};
|
|
false ->
|
|
{next_state,
|
|
delete_pending,
|
|
State,
|
|
?DELETE_TIMEOUT}
|
|
end;
|
|
false ->
|
|
leveled_log:log("CDB04", [State#state.filename, ManSQN]),
|
|
close_pendingdelete(State#state.handle,
|
|
State#state.filename,
|
|
State#state.waste_path),
|
|
{stop, normal, State}
|
|
end;
|
|
delete_pending(destroy, State) ->
|
|
leveled_log:log("CDB05", [State#state.filename, delete_pending, destroy]),
|
|
close_pendingdelete(State#state.handle,
|
|
State#state.filename,
|
|
State#state.waste_path),
|
|
{stop, normal, State}.
|
|
|
|
|
|
handle_sync_event({cdb_scan, FilterFun, Acc, StartPos},
|
|
_From,
|
|
StateName,
|
|
State) ->
|
|
{ok, EndPos0} = file:position(State#state.handle, eof),
|
|
{ok, StartPos0} = case StartPos of
|
|
undefined ->
|
|
file:position(State#state.handle,
|
|
?BASE_POSITION);
|
|
StartPos ->
|
|
{ok, StartPos}
|
|
end,
|
|
file:position(State#state.handle, StartPos0),
|
|
file:advise(State#state.handle,
|
|
StartPos0,
|
|
EndPos0 - StartPos0,
|
|
sequential),
|
|
MaybeEnd = (check_last_key(State#state.last_key) == empty) or
|
|
(StartPos0 >= (EndPos0 - ?DWORD_SIZE)),
|
|
{LastPosition, Acc2} =
|
|
case MaybeEnd of
|
|
true ->
|
|
{eof, Acc};
|
|
false ->
|
|
scan_over_file(State#state.handle,
|
|
StartPos0,
|
|
FilterFun,
|
|
Acc,
|
|
State#state.last_key)
|
|
end,
|
|
{ok, LastReadPos} = file:position(State#state.handle, cur),
|
|
file:advise(State#state.handle,
|
|
StartPos0,
|
|
LastReadPos - StartPos0,
|
|
dont_need),
|
|
{reply, {LastPosition, Acc2}, StateName, State};
|
|
handle_sync_event(cdb_lastkey, _From, StateName, State) ->
|
|
{reply, State#state.last_key, StateName, State};
|
|
handle_sync_event(cdb_firstkey, _From, StateName, State) ->
|
|
{ok, EOFPos} = file:position(State#state.handle, eof),
|
|
FilterFun = fun(Key, _V, _P, _O, _Fun) -> {stop, Key} end,
|
|
FirstKey =
|
|
case EOFPos of
|
|
?BASE_POSITION ->
|
|
empty;
|
|
_ ->
|
|
file:position(State#state.handle, ?BASE_POSITION),
|
|
{_Pos, FirstScanKey} = scan_over_file(State#state.handle,
|
|
?BASE_POSITION,
|
|
FilterFun,
|
|
empty,
|
|
State#state.last_key),
|
|
FirstScanKey
|
|
end,
|
|
{reply, FirstKey, StateName, State};
|
|
handle_sync_event(cdb_filename, _From, StateName, State) ->
|
|
{reply, State#state.filename, StateName, State};
|
|
handle_sync_event(cdb_isrolling, _From, StateName, State) ->
|
|
{reply, StateName == rolling, StateName, State};
|
|
handle_sync_event(cdb_close, _From, delete_pending, State) ->
|
|
leveled_log:log("CDB05",
|
|
[State#state.filename, delete_pending, cdb_close]),
|
|
close_pendingdelete(State#state.handle,
|
|
State#state.filename,
|
|
State#state.waste_path),
|
|
{stop, normal, ok, State};
|
|
handle_sync_event(cdb_close, _From, StateName, State) ->
|
|
leveled_log:log("CDB05", [State#state.filename, StateName, cdb_close]),
|
|
file:close(State#state.handle),
|
|
{stop, normal, ok, State}.
|
|
|
|
handle_event(_Msg, StateName, State) ->
|
|
{next_state, StateName, State}.
|
|
|
|
handle_info(_Msg, StateName, State) ->
|
|
{next_state, StateName, State}.
|
|
|
|
terminate(_Reason, _StateName, _State) ->
|
|
ok.
|
|
|
|
|
|
|
|
code_change(_OldVsn, StateName, State, _Extra) ->
|
|
{ok, StateName, State}.
|
|
|
|
|
|
%%%============================================================================
|
|
%%% External functions
|
|
%%%============================================================================
|
|
|
|
|
|
finished_rolling(CDB) ->
|
|
RollerFun =
|
|
fun(Sleep, FinishedRolling) ->
|
|
case FinishedRolling of
|
|
true ->
|
|
true;
|
|
false ->
|
|
timer:sleep(Sleep),
|
|
not leveled_cdb:cdb_isrolling(CDB)
|
|
end
|
|
end,
|
|
lists:foldl(RollerFun, false, [0, 1000, 10000, 100000]).
|
|
|
|
%%%============================================================================
|
|
%%% Internal functions
|
|
%%%============================================================================
|
|
|
|
|
|
-spec close_pendingdelete(file:io_device(), list(), list()|undefined) -> ok.
|
|
%% @doc
|
|
%% If delete is pending - then the close behaviour needs to actuallly delete
|
|
%% the file
|
|
close_pendingdelete(Handle, Filename, WasteFP) ->
|
|
ok = file:close(Handle),
|
|
case filelib:is_file(Filename) of
|
|
true ->
|
|
case WasteFP of
|
|
undefined ->
|
|
ok = file:delete(Filename);
|
|
WasteFP ->
|
|
Components = filename:split(Filename),
|
|
NewName = WasteFP ++ lists:last(Components),
|
|
file:rename(Filename, NewName)
|
|
end;
|
|
false ->
|
|
% This may happen when there has been a destroy while files are
|
|
% still pending deletion
|
|
leveled_log:log("CDB21", [Filename])
|
|
end.
|
|
|
|
-spec set_writeops(sync|riak_sync|none) -> {list(), sync|riak_sync|none}.
|
|
%% Assumption is that sync should be used - it is a transaction log.
|
|
%%
|
|
%% However this flag is not supported in OTP 16. Bitcask appears to pass an
|
|
%% o_sync flag, but this isn't supported either (maybe it works with the
|
|
%% bitcask nif fileops).
|
|
%%
|
|
%% To get round this will try and datasync on each PUT with riak_sync
|
|
-ifdef(no_sync).
|
|
|
|
set_writeops(SyncStrategy) ->
|
|
case SyncStrategy of
|
|
sync ->
|
|
{?WRITE_OPS, riak_sync};
|
|
riak_sync ->
|
|
{?WRITE_OPS, riak_sync};
|
|
none ->
|
|
{?WRITE_OPS, none}
|
|
end.
|
|
|
|
-else.
|
|
|
|
set_writeops(SyncStrategy) ->
|
|
case SyncStrategy of
|
|
sync ->
|
|
{[sync | ?WRITE_OPS], sync};
|
|
riak_sync ->
|
|
{?WRITE_OPS, riak_sync};
|
|
none ->
|
|
{?WRITE_OPS, none}
|
|
end.
|
|
|
|
-endif.
|
|
|
|
-spec open_active_file(list()) -> {integer(), ets:tid(), any()}.
|
|
%% @doc
|
|
%% Open an active file - one for which it is assumed the hash tables have not
|
|
%% yet been written
|
|
%%
|
|
%% Needs to scan over file to incrementally produce the hash list, starting at
|
|
%% the end of the top index table.
|
|
%%
|
|
%% Should return a dictionary keyed by index containing a list of {Hash, Pos}
|
|
%% tuples as the write_key_value_pairs function, and the current position, and
|
|
%% the file handle
|
|
open_active_file(FileName) when is_list(FileName) ->
|
|
{ok, Handle} = file:open(FileName, ?WRITE_OPS),
|
|
{ok, Position} = file:position(Handle, {bof, 256*?DWORD_SIZE}),
|
|
{LastPosition, {HashTree, LastKey}} = startup_scan_over_file(Handle,
|
|
Position),
|
|
case file:position(Handle, eof) of
|
|
{ok, LastPosition} ->
|
|
ok = file:close(Handle);
|
|
{ok, EndPosition} ->
|
|
case {LastPosition, EndPosition} of
|
|
{?BASE_POSITION, 0} ->
|
|
ok;
|
|
_ ->
|
|
leveled_log:log("CDB06", [LastPosition, EndPosition])
|
|
end,
|
|
{ok, _LastPosition} = file:position(Handle, LastPosition),
|
|
ok = file:truncate(Handle),
|
|
ok = file:close(Handle)
|
|
end,
|
|
{LastPosition, HashTree, LastKey}.
|
|
|
|
-spec put(list()|file:io_device(),
|
|
any(), any(),
|
|
{integer(), ets:tid()}, boolean(), integer(), boolean())
|
|
-> roll|{file:io_device(), integer(), ets:tid()}.
|
|
%% @doc
|
|
%% put(Handle, Key, Value, {LastPosition, HashDict}) -> {NewPosition, KeyDict}
|
|
%% Append to an active file a new key/value pair returning an updated
|
|
%% dictionary of Keys and positions. Returns an updated Position
|
|
%%
|
|
put(FileName,
|
|
Key,
|
|
Value,
|
|
{LastPosition, HashTree},
|
|
BinaryMode,
|
|
MaxSize,
|
|
IsEmpty) when is_list(FileName) ->
|
|
{ok, Handle} = file:open(FileName, ?WRITE_OPS),
|
|
put(Handle, Key, Value, {LastPosition, HashTree},
|
|
BinaryMode, MaxSize, IsEmpty);
|
|
put(Handle, Key, Value, {LastPosition, HashTree},
|
|
BinaryMode, MaxSize, IsEmpty) ->
|
|
Bin = key_value_to_record({Key, Value}, BinaryMode),
|
|
ObjectSize = byte_size(Bin),
|
|
SizeWithinReason = ObjectSize < ?MAX_OBJECT_SIZE,
|
|
PotentialNewSize = LastPosition + ObjectSize,
|
|
case {IsEmpty, PotentialNewSize > MaxSize} of
|
|
{false, true} ->
|
|
roll;
|
|
_ ->
|
|
if
|
|
SizeWithinReason ->
|
|
ok = file:pwrite(Handle, LastPosition, Bin),
|
|
{Handle,
|
|
PotentialNewSize,
|
|
put_hashtree(Key, LastPosition, HashTree)}
|
|
end
|
|
end.
|
|
|
|
|
|
-spec mput(file:io_device(),
|
|
list(tuple()),
|
|
{integer(), ets:tid()}, boolean(), integer())
|
|
-> roll|{file:io_device(), integer(), ets:tid(), any()}.
|
|
%% @doc
|
|
%% Multiple puts - either all will succeed or it will return roll with non
|
|
%% succeeding.
|
|
mput(Handle, KVList, {LastPosition, HashTree0}, BinaryMode, MaxSize) ->
|
|
{KPList, Bin, LastKey} = multi_key_value_to_record(KVList,
|
|
BinaryMode,
|
|
LastPosition),
|
|
PotentialNewSize = LastPosition + byte_size(Bin),
|
|
if
|
|
PotentialNewSize > MaxSize ->
|
|
roll;
|
|
true ->
|
|
ok = file:pwrite(Handle, LastPosition, Bin),
|
|
HashTree1 = lists:foldl(fun({K, P}, Acc) ->
|
|
put_hashtree(K, P, Acc)
|
|
end,
|
|
HashTree0,
|
|
KPList),
|
|
{Handle, PotentialNewSize, HashTree1, LastKey}
|
|
end.
|
|
|
|
|
|
-spec get_withcache(file:io_device(),
|
|
any(),
|
|
tuple(),
|
|
boolean(),
|
|
cdb_timings())
|
|
-> {cdb_timings(), missing|probably|tuple()}.
|
|
%% @doc
|
|
%%
|
|
%% Using a cache of the Index array - get a K/V pair from the file using the
|
|
%% Key. should return an updated timings object (if timings are being taken)
|
|
%% along with the result (which may be missing if the no matching entry is
|
|
%% found, or probably in QuickCheck scenarios)
|
|
get_withcache(Handle, Key, Cache, BinaryMode, Timings) ->
|
|
get(Handle, Key, Cache, true, BinaryMode, Timings).
|
|
|
|
get_withcache(Handle, Key, Cache, QuickCheck, BinaryMode, Timings) ->
|
|
get(Handle, Key, Cache, QuickCheck, BinaryMode, Timings).
|
|
|
|
get(FileNameOrHandle, Key, BinaryMode) ->
|
|
{no_timing, R} =
|
|
get(FileNameOrHandle, Key, no_cache, true, BinaryMode, no_timing),
|
|
R.
|
|
|
|
|
|
-spec get(list()|file:io_device(),
|
|
any(), no_cache|tuple(),
|
|
loose_presence|any(),
|
|
boolean(),
|
|
cdb_timings())
|
|
-> {cdb_timings(), tuple()|probably|missing}.
|
|
%% @doc
|
|
%%
|
|
%% Get a K/V pair from the file using the Key. QuickCheck can be set to
|
|
%% loose_presence if all is required is a loose check of presence (that the
|
|
%% Key is probably present as there is a hash in the hash table which matches
|
|
%% that Key)
|
|
%%
|
|
%% Timings also passed in and can be updated based on results
|
|
get(FileName, Key, Cache, QuickCheck, BinaryMode, Timings)
|
|
when is_list(FileName) ->
|
|
{ok, Handle} = file:open(FileName,[binary, raw, read]),
|
|
get(Handle, Key, Cache, QuickCheck, BinaryMode, Timings);
|
|
get(Handle, Key, Cache, QuickCheck, BinaryMode, Timings)
|
|
when is_tuple(Handle) ->
|
|
SW = os:timestamp(),
|
|
|
|
Hash = hash(Key),
|
|
Index = hash_to_index(Hash),
|
|
{HashTable, Count} = get_index(Handle, Index, Cache),
|
|
|
|
% If the count is 0 for that index - key must be missing
|
|
case Count of
|
|
0 ->
|
|
{Timings, missing};
|
|
_ ->
|
|
% Get starting slot in hashtable
|
|
{ok, FirstHashPosition} =
|
|
file:position(Handle, {bof, HashTable}),
|
|
Slot = hash_to_slot(Hash, Count),
|
|
UpdTimings = update_indextimings(Timings, SW),
|
|
search_hash_table(Handle,
|
|
{FirstHashPosition,
|
|
Slot,
|
|
1,
|
|
Count},
|
|
Hash,
|
|
Key,
|
|
QuickCheck,
|
|
BinaryMode,
|
|
UpdTimings)
|
|
end.
|
|
|
|
get_index(Handle, Index, no_cache) ->
|
|
{ok,_} = file:position(Handle, {bof, ?DWORD_SIZE * Index}),
|
|
% Get location of hashtable and number of entries in the hash
|
|
read_next_2_integers(Handle);
|
|
get_index(_Handle, Index, Cache) ->
|
|
element(Index + 1, Cache).
|
|
|
|
-spec get_mem(any(), list()|file:io_device(), ets:tid(), boolean()) ->
|
|
tuple()|probably|missing.
|
|
%% @doc
|
|
%% Get a Key/Value pair from an active CDB file (with no hash table written)
|
|
get_mem(Key, FNOrHandle, HashTree, BinaryMode) ->
|
|
get_mem(Key, FNOrHandle, HashTree, BinaryMode, true).
|
|
|
|
get_mem(Key, Filename, HashTree, BinaryMode, QuickCheck) when is_list(Filename) ->
|
|
{ok, Handle} = file:open(Filename, [binary, raw, read]),
|
|
get_mem(Key, Handle, HashTree, BinaryMode, QuickCheck);
|
|
get_mem(Key, Handle, HashTree, BinaryMode, QuickCheck) ->
|
|
ListToCheck = get_hashtree(Key, HashTree),
|
|
case {QuickCheck, ListToCheck} of
|
|
{loose_presence, []} ->
|
|
missing;
|
|
{loose_presence, _L} ->
|
|
probably;
|
|
_ ->
|
|
extract_kvpair(Handle, ListToCheck, Key, BinaryMode)
|
|
end.
|
|
|
|
-spec hashtable_calc(ets:tid(), integer()) -> {list(), binary()}.
|
|
%% @doc
|
|
%% Create a binary representation of the hash table to be written to the end
|
|
%% of the file
|
|
hashtable_calc(HashTree, StartPos) ->
|
|
Seq = lists:seq(0, 255),
|
|
SWC = os:timestamp(),
|
|
{IndexList, HashTreeBin} = write_hash_tables(Seq, HashTree, StartPos),
|
|
leveled_log:log_timer("CDB07", [], SWC),
|
|
{IndexList, HashTreeBin}.
|
|
|
|
%%%%%%%%%%%%%%%%%%%%
|
|
%% Internal functions
|
|
%%%%%%%%%%%%%%%%%%%%
|
|
|
|
|
|
determine_new_filename(Filename) ->
|
|
filename:rootname(Filename, ".pnd") ++ ".cdb".
|
|
|
|
rename_for_read(Filename, NewName) ->
|
|
%% Rename file
|
|
leveled_log:log("CDB08", [Filename, NewName, filelib:is_file(NewName)]),
|
|
file:rename(Filename, NewName).
|
|
|
|
|
|
-spec open_for_readonly(string(), term())
|
|
-> {file:io_device(), hashtable_index(), term()}.
|
|
%% @doc
|
|
%% Open a CDB file to accept read requests (e.g. key/value lookups) but no
|
|
%% additions or changes
|
|
open_for_readonly(Filename, LastKeyKnown) ->
|
|
{ok, Handle} = file:open(Filename, [binary, raw, read]),
|
|
Index = load_index(Handle),
|
|
LastKey =
|
|
case LastKeyKnown of
|
|
false ->
|
|
find_lastkey(Handle, Index);
|
|
LastKeyKnown ->
|
|
LastKeyKnown
|
|
end,
|
|
{Handle, Index, LastKey}.
|
|
|
|
|
|
-spec load_index(file:io_device()) -> hashtable_index().
|
|
%% @doc
|
|
%% The CDB file has at the beginning an index of how many keys are present in
|
|
%% each of 256 slices of the hashtable. This loads that index
|
|
load_index(Handle) ->
|
|
Index = lists:seq(0, 255),
|
|
LoadIndexFun =
|
|
fun(X) ->
|
|
file:position(Handle, {bof, ?DWORD_SIZE * X}),
|
|
{HashTablePos, Count} = read_next_2_integers(Handle),
|
|
{HashTablePos, Count}
|
|
end,
|
|
list_to_tuple(lists:map(LoadIndexFun, Index)).
|
|
|
|
|
|
-spec find_lastkey(file:io_device(), hashtable_index()) -> empty|term().
|
|
%% @doc
|
|
%% Function to find the LastKey in the file
|
|
find_lastkey(Handle, IndexCache) ->
|
|
ScanIndexFun =
|
|
fun(Index, {LastPos, KeyCount}) ->
|
|
{Pos, Count} = element(Index + 1, IndexCache),
|
|
scan_index_findlast(Handle, Pos, Count, {LastPos, KeyCount})
|
|
end,
|
|
{LastPosition, TotalKeys} = lists:foldl(ScanIndexFun,
|
|
{0, 0},
|
|
lists:seq(0, 255)),
|
|
case TotalKeys of
|
|
0 ->
|
|
empty;
|
|
_ ->
|
|
{ok, _} = file:position(Handle, LastPosition),
|
|
{KeyLength, _ValueLength} = read_next_2_integers(Handle),
|
|
safe_read_next_key(Handle, KeyLength)
|
|
end.
|
|
|
|
|
|
scan_index_findlast(Handle, Position, Count, {LastPosition, TotalKeys}) ->
|
|
{ok, _} = file:position(Handle, Position),
|
|
MaxPosFun = fun({_Hash, HPos}, MaxPos) -> max(HPos, MaxPos) end,
|
|
MaxPos = lists:foldl(MaxPosFun,
|
|
LastPosition,
|
|
read_next_n_integerpairs(Handle, Count)),
|
|
{MaxPos, TotalKeys + Count}.
|
|
|
|
scan_index_returnpositions(Handle, Position, Count, PosList0) ->
|
|
{ok, _} = file:position(Handle, Position),
|
|
AddPosFun =
|
|
fun({Hash, HPosition}, PosList) ->
|
|
case Hash of
|
|
0 ->
|
|
PosList;
|
|
_ ->
|
|
[HPosition|PosList]
|
|
end
|
|
end,
|
|
PosList = lists:foldl(AddPosFun,
|
|
PosList0,
|
|
read_next_n_integerpairs(Handle, Count)),
|
|
lists:reverse(PosList).
|
|
|
|
|
|
%% Take an active file and write the hash details necessary to close that
|
|
%% file and roll a new active file if requested.
|
|
%%
|
|
%% Base Pos should be at the end of the KV pairs written (the position for)
|
|
%% the hash tables
|
|
close_file(Handle, HashTree, BasePos) ->
|
|
{ok, BasePos} = file:position(Handle, BasePos),
|
|
IndexList = write_hash_tables(Handle, HashTree),
|
|
ok = write_top_index_table(Handle, BasePos, IndexList),
|
|
file:close(Handle).
|
|
|
|
|
|
%% Fetch a list of positions by passing a key to the HashTree
|
|
get_hashtree(Key, HashTree) ->
|
|
Hash = hash(Key),
|
|
Index = hash_to_index(Hash),
|
|
lookup_positions(HashTree, Index, Hash).
|
|
|
|
%% Add to hash tree - this is an array of 256 skiplists that contains the Hash
|
|
%% and position of objects which have been added to an open CDB file
|
|
put_hashtree(Key, Position, HashTree) ->
|
|
Hash = hash(Key),
|
|
Index = hash_to_index(Hash),
|
|
add_position_tohashtree(HashTree, Index, Hash, Position).
|
|
|
|
%% Function to extract a Key-Value pair given a file handle and a position
|
|
%% Will confirm that the key matches and do a CRC check
|
|
extract_kvpair(_H, [], _K, _BinaryMode) ->
|
|
missing;
|
|
extract_kvpair(Handle, [Position|Rest], Key, BinaryMode) ->
|
|
{ok, _} = file:position(Handle, Position),
|
|
{KeyLength, ValueLength} = read_next_2_integers(Handle),
|
|
case safe_read_next_keybin(Handle, KeyLength) of
|
|
{Key, KeyBin} -> % If same key as passed in, then found!
|
|
case checkread_next_value(Handle, ValueLength, KeyBin) of
|
|
{false, _} ->
|
|
crc_wonky;
|
|
{_, Value} ->
|
|
case BinaryMode of
|
|
true ->
|
|
{Key, Value};
|
|
false ->
|
|
{Key, binary_to_term(Value)}
|
|
end
|
|
end;
|
|
_ ->
|
|
extract_kvpair(Handle, Rest, Key, BinaryMode)
|
|
end.
|
|
|
|
extract_key(Handle, Position) ->
|
|
{ok, _} = file:position(Handle, Position),
|
|
{KeyLength, _ValueLength} = read_next_2_integers(Handle),
|
|
{safe_read_next_key(Handle, KeyLength)}.
|
|
|
|
extract_key_size(Handle, Position) ->
|
|
{ok, _} = file:position(Handle, Position),
|
|
{KeyLength, ValueLength} = read_next_2_integers(Handle),
|
|
K = safe_read_next_key(Handle, KeyLength),
|
|
{K, ValueLength}.
|
|
|
|
extract_key_value_check(Handle, Position, BinaryMode) ->
|
|
{ok, _} = file:position(Handle, Position),
|
|
case {BinaryMode, saferead_keyvalue(Handle)} of
|
|
{_, false} ->
|
|
{null, crc_wonky, false};
|
|
{true, {Key, Value, _KeyL, _ValueL}} ->
|
|
{Key, Value, true};
|
|
{false, {Key, Value, _KeyL, _ValueL}} ->
|
|
{Key, binary_to_term(Value), true}
|
|
end.
|
|
|
|
|
|
-spec startup_scan_over_file(file:io_device(), file_location())
|
|
-> {file_location(), any()}.
|
|
%% @doc
|
|
%% Scan through the file until there is a failure to crc check an input, and
|
|
%% at that point return the position and the key dictionary scanned so far
|
|
startup_scan_over_file(Handle, Position) ->
|
|
HashTree = new_hashtree(),
|
|
{eof, Output} = scan_over_file(Handle,
|
|
Position,
|
|
fun startup_filter/5,
|
|
{HashTree, empty},
|
|
empty),
|
|
{ok, FinalPos} = file:position(Handle, cur),
|
|
{FinalPos, Output}.
|
|
|
|
|
|
%% @doc
|
|
%% Specific filter to be used at startup to build a hashtree for an incomplete
|
|
%% cdb file, and returns at the end the hashtree and the final Key seen in the
|
|
%% journal
|
|
startup_filter(Key, _ValueAsBin, Position, {Hashtree, _LastKey}, _ExtractFun) ->
|
|
{loop, {put_hashtree(Key, Position, Hashtree), Key}}.
|
|
|
|
|
|
-spec scan_over_file(file:io_device(), file_location(), fun(), any(), any())
|
|
-> {file_location(), any()}.
|
|
%% Scan for key changes - scan over file returning applying FilterFun
|
|
%% The FilterFun should accept as input:
|
|
%% - Key, ValueBin, Position, Accumulator, Fun (to extract values from Binary)
|
|
%% -> outputting a new Accumulator and a loop|stop instruction as a tuple
|
|
%% i.e. {loop, Acc} or {stop, Acc}
|
|
scan_over_file(Handle, Position, FilterFun, Output, LastKey) ->
|
|
case saferead_keyvalue(Handle) of
|
|
false ->
|
|
case {LastKey, Position} of
|
|
{empty, ?BASE_POSITION} ->
|
|
% Not interesting that we've nothing to read at base
|
|
ok;
|
|
_ ->
|
|
leveled_log:log("CDB09", [Position])
|
|
end,
|
|
% Bring file back to that position
|
|
{ok, Position} = file:position(Handle, {bof, Position}),
|
|
{eof, Output};
|
|
{Key, ValueAsBin, KeyLength, ValueLength} ->
|
|
NewPosition = case Key of
|
|
LastKey ->
|
|
eof;
|
|
_ ->
|
|
Position + KeyLength + ValueLength
|
|
+ ?DWORD_SIZE
|
|
end,
|
|
case FilterFun(Key,
|
|
ValueAsBin,
|
|
Position,
|
|
Output,
|
|
fun extract_valueandsize/1) of
|
|
{stop, UpdOutput} ->
|
|
{Position, UpdOutput};
|
|
{loop, UpdOutput} ->
|
|
case NewPosition of
|
|
eof ->
|
|
{eof, UpdOutput};
|
|
_ ->
|
|
scan_over_file(Handle,
|
|
NewPosition,
|
|
FilterFun,
|
|
UpdOutput,
|
|
LastKey)
|
|
end
|
|
end
|
|
end.
|
|
|
|
|
|
%% @doc
|
|
%% Confirm that the last key has been defined and set to a non-default value
|
|
check_last_key(empty) ->
|
|
empty;
|
|
check_last_key(_LK) ->
|
|
ok.
|
|
|
|
|
|
-spec saferead_keyvalue(file:io_device())
|
|
-> false|{any(), any(), integer(), integer()}.
|
|
%% @doc
|
|
%% Read the Key/Value at this point, returning {ok, Key, Value}
|
|
%% catch expected exceptions associated with file corruption (or end) and
|
|
%% return eof
|
|
saferead_keyvalue(Handle) ->
|
|
case read_next_2_integers(Handle) of
|
|
eof ->
|
|
false;
|
|
{KeyL, ValueL} when is_integer(KeyL), is_integer(ValueL) ->
|
|
case safe_read_next_keybin(Handle, KeyL) of
|
|
false ->
|
|
false;
|
|
{Key, KeyBin} ->
|
|
case safe_read_next_value(Handle, ValueL, KeyBin) of
|
|
false ->
|
|
false;
|
|
TrueValue ->
|
|
% i.e. value with no CRC
|
|
{Key, TrueValue, KeyL, ValueL}
|
|
end
|
|
end;
|
|
_ ->
|
|
false
|
|
end.
|
|
|
|
|
|
-spec safe_read_next_key(file:io_device(), integer()) -> false|term().
|
|
%% @doc
|
|
%% Return the next key or have false returned if there is some sort of
|
|
%% potentially expected error (e.g. due to file truncation). Note that no
|
|
%% CRC check has been performed
|
|
safe_read_next_key(Handle, Length) ->
|
|
ReadFun = fun(Bin) -> binary_to_term(Bin) end,
|
|
safe_read_next(Handle, Length, ReadFun).
|
|
|
|
-spec safe_read_next_keybin(file:io_device(), integer())
|
|
-> false|{term(), binary()}.
|
|
%% @doc
|
|
%% Return the next key or have false returned if there is some sort of
|
|
%% potentially expected error (e.g. due to file truncation). Note that no
|
|
%% CRC check has been performed
|
|
%% Returns both the Key and the Binary version, the binary version being
|
|
%% required for the CRC checking after the value fetch (see
|
|
%% safe_read_next_value/3)
|
|
safe_read_next_keybin(Handle, Length) ->
|
|
ReadFun = fun(Bin) -> {binary_to_term(Bin), Bin} end,
|
|
safe_read_next(Handle, Length, ReadFun).
|
|
|
|
-spec safe_read_next_value(file:io_device(), integer(), binary())
|
|
-> binary()|false.
|
|
safe_read_next_value(Handle, Length, KeyBin) ->
|
|
ReadFun = fun(VBin) -> crccheck(VBin, KeyBin) end,
|
|
safe_read_next(Handle, Length, ReadFun).
|
|
|
|
|
|
-spec safe_read_next(file:io_device(), integer(), fun()) -> any().
|
|
%% @doc
|
|
%% Read the next item of length Length
|
|
%% Previously catching error:badarg was sufficient to capture errors of
|
|
%% corruption, but on some OS versions may need to catch error:einval as well
|
|
safe_read_next(Handle, Length, ReadFun) ->
|
|
try
|
|
loose_read(Handle, Length, ReadFun)
|
|
catch
|
|
error:ReadError ->
|
|
leveled_log:log("CDB20", [ReadError, Length]),
|
|
false
|
|
end.
|
|
|
|
-spec loose_read(file:io_device(), integer(), fun()) -> any().
|
|
%% @doc
|
|
%% Read with minimal error handling (only eof) - to be wrapped in
|
|
%% safe_read_next/3 to catch exceptions.
|
|
loose_read(Handle, Length, ReadFun) ->
|
|
case file:read(Handle, Length) of
|
|
eof ->
|
|
false;
|
|
{ok, Result} ->
|
|
ReadFun(Result)
|
|
end.
|
|
|
|
|
|
-spec crccheck(binary()|bitstring(), binary()) -> any().
|
|
%% @doc
|
|
%% CRC chaeck the value which should be a binary, where the first four bytes
|
|
%% are a CRC check. If the binary is truncated, it could be a bitstring or
|
|
%% less than 4 bytes - in which case return false to recognise the corruption.
|
|
crccheck(<<CRC:32/integer, Value/binary>>, KeyBin) when is_binary(KeyBin) ->
|
|
case calc_crc(KeyBin, Value) of
|
|
CRC ->
|
|
Value;
|
|
_ ->
|
|
leveled_log:log("CDB10", []),
|
|
false
|
|
end;
|
|
crccheck(_V, _KB) ->
|
|
leveled_log:log("CDB11", []),
|
|
false.
|
|
|
|
|
|
-spec calc_crc(binary(), binary()) -> integer().
|
|
%% @doc
|
|
%% Do a vaanilla CRC calculation on the binary
|
|
calc_crc(KeyBin, Value) -> erlang:crc32(<<KeyBin/binary, Value/binary>>).
|
|
|
|
|
|
-spec checkread_next_value(file:io_device(), integer(), binary())
|
|
-> {boolean(), binary()|crc_wonky}.
|
|
%% @doc
|
|
%% Read next string where the string has a CRC prepended - stripping the crc
|
|
%% and checking if requested
|
|
checkread_next_value(Handle, Length, KeyBin) ->
|
|
{ok, <<CRC:32/integer, Value/binary>>} = file:read(Handle, Length),
|
|
case calc_crc(KeyBin, Value) of
|
|
CRC ->
|
|
{true, Value};
|
|
_ ->
|
|
{false, crc_wonky}
|
|
end.
|
|
|
|
%% Extract value and size from binary containing CRC
|
|
extract_valueandsize(ValueAsBin) ->
|
|
{ValueAsBin, byte_size(ValueAsBin)}.
|
|
|
|
|
|
%% Used for reading lengths
|
|
%% Note that the endian_flip is required to make the file format compatible
|
|
%% with CDB
|
|
read_next_2_integers(Handle) ->
|
|
case file:read(Handle, ?DWORD_SIZE) of
|
|
{ok, <<Int1:32,Int2:32>>} ->
|
|
{endian_flip(Int1), endian_flip(Int2)};
|
|
ReadError ->
|
|
ReadError
|
|
end.
|
|
|
|
read_next_n_integerpairs(Handle, NumberOfPairs) ->
|
|
{ok, Block} = file:read(Handle, ?DWORD_SIZE * NumberOfPairs),
|
|
read_integerpairs(Block, []).
|
|
|
|
read_integerpairs(<<>>, Pairs) ->
|
|
Pairs;
|
|
read_integerpairs(<<Int1:32, Int2:32, Rest/binary>>, Pairs) ->
|
|
read_integerpairs(<<Rest/binary>>,
|
|
Pairs ++ [{endian_flip(Int1),
|
|
endian_flip(Int2)}]).
|
|
|
|
|
|
|
|
-spec search_hash_table(file:io_device(), tuple(), integer(), any(),
|
|
loose_presence|boolean(), boolean(),
|
|
cdb_timings()) ->
|
|
{cdb_timings(), missing|probably|tuple()}.
|
|
%% @doc
|
|
%%
|
|
%% Seach the hash table for the matching hash and key. Be prepared for
|
|
%% multiple keys to have the same hash value.
|
|
%%
|
|
%% There are three possible values of CRCCheck:
|
|
%% true - check the CRC before returning key & value
|
|
%% false - don't check the CRC before returning key & value
|
|
%% loose_presence - confirm that the hash of the key is present
|
|
search_hash_table(_Handle,
|
|
{_, _, _TotalSlots, _TotalSlots},
|
|
_Hash, _Key,
|
|
_QuickCheck, _BinaryMode, Timings) ->
|
|
% We have done the full loop - value must not be present
|
|
{Timings, missing};
|
|
search_hash_table(Handle,
|
|
{FirstHashPosition, Slot, CycleCount, TotalSlots},
|
|
Hash, Key,
|
|
QuickCheck, BinaryMode, Timings) ->
|
|
|
|
% Read the next 2 integers at current position, see if it matches the hash
|
|
% we're after
|
|
Offset =
|
|
((Slot + CycleCount - 1) rem TotalSlots) * ?DWORD_SIZE
|
|
+ FirstHashPosition,
|
|
{ok, _} = file:position(Handle, Offset),
|
|
{StoredHash, DataLoc} = read_next_2_integers(Handle),
|
|
|
|
case StoredHash of
|
|
Hash ->
|
|
KV =
|
|
case QuickCheck of
|
|
loose_presence ->
|
|
probably;
|
|
_ ->
|
|
extract_kvpair(Handle, [DataLoc], Key, BinaryMode)
|
|
end,
|
|
case KV of
|
|
missing ->
|
|
leveled_log:log("CDB15", [Hash]),
|
|
search_hash_table(Handle,
|
|
{FirstHashPosition,
|
|
Slot,
|
|
CycleCount + 1,
|
|
TotalSlots},
|
|
Hash, Key,
|
|
QuickCheck, BinaryMode,
|
|
Timings);
|
|
_ ->
|
|
UpdTimings = update_fetchtimings(Timings, CycleCount),
|
|
{UpdTimings, KV}
|
|
end;
|
|
0 ->
|
|
{Timings, missing};
|
|
_ ->
|
|
search_hash_table(Handle,
|
|
{FirstHashPosition,
|
|
Slot,
|
|
CycleCount + 1,
|
|
TotalSlots},
|
|
Hash, Key,
|
|
QuickCheck, BinaryMode,
|
|
Timings)
|
|
end.
|
|
|
|
|
|
-spec update_fetchtimings(no_timing|cdb_timings(), integer()) ->
|
|
no_timing|cdb_timings().
|
|
%% @doc
|
|
%%
|
|
%% Update the timings record if sample timings currently being taken
|
|
%% (otherwise the timngs record will be set to no_timing)
|
|
update_fetchtimings(no_timing, _CycleCount) ->
|
|
no_timing;
|
|
update_fetchtimings(Timings, CycleCount) ->
|
|
FetchTime =
|
|
timer:now_diff(os:timestamp(),
|
|
Timings#cdb_timings.fetchloop_starttime),
|
|
Timings#cdb_timings{sample_fetchtime =
|
|
Timings#cdb_timings.sample_fetchtime + FetchTime,
|
|
sample_cyclecount =
|
|
Timings#cdb_timings.sample_cyclecount + CycleCount,
|
|
sample_count =
|
|
Timings#cdb_timings.sample_count + 1}.
|
|
|
|
-spec update_indextimings(no_timing|cdb_timings(), erlang:timestamp()) ->
|
|
no_timing|cdb_timings().
|
|
%% @doc
|
|
%%
|
|
%% Update the timings record with the time spent looking up the position
|
|
%% list to check from the index
|
|
update_indextimings(no_timing, _SW) ->
|
|
no_timing;
|
|
update_indextimings(Timings, SW) ->
|
|
IdxTime = timer:now_diff(os:timestamp(), SW),
|
|
Timings#cdb_timings{sample_indextime =
|
|
Timings#cdb_timings.sample_indextime
|
|
+ IdxTime,
|
|
fetchloop_starttime =
|
|
os:timestamp()}.
|
|
|
|
-spec update_statetimings(cdb_timings(), integer())
|
|
-> {cdb_timings(), integer()}.
|
|
%% @doc
|
|
%%
|
|
%% The timings state is either in countdown to the next set of samples of
|
|
%% we are actively collecting a sample. Active collection take place
|
|
%% when the countdown is 0. Once the sample has reached the expected count
|
|
%% then there is a log of that sample, and the countdown is restarted.
|
|
%%
|
|
%% Outside of sample windows the timings object should be set to the atom
|
|
%% no_timing. no_timing is a valid state for the cdb_timings type.
|
|
update_statetimings(no_timing, 0) ->
|
|
{#cdb_timings{}, 0};
|
|
update_statetimings(Timings, 0) ->
|
|
case Timings#cdb_timings.sample_count of
|
|
SC when SC >= ?TIMING_SAMPLESIZE ->
|
|
leveled_log:log("CDB19", [Timings#cdb_timings.sample_count,
|
|
Timings#cdb_timings.sample_cyclecount,
|
|
Timings#cdb_timings.sample_fetchtime,
|
|
Timings#cdb_timings.sample_indextime]),
|
|
{no_timing, leveled_rand:uniform(2 * ?TIMING_SAMPLECOUNTDOWN)};
|
|
_SC ->
|
|
{Timings, 0}
|
|
end;
|
|
update_statetimings(no_timing, N) ->
|
|
{no_timing, N - 1}.
|
|
|
|
|
|
% Write Key and Value tuples into the CDB. Each tuple consists of a
|
|
% 4 byte key length, a 4 byte value length, the actual key followed
|
|
% by the value.
|
|
%
|
|
% Returns a dictionary that is keyed by
|
|
% the least significant 8 bits of each hash with the
|
|
% values being a list of the hash and the position of the
|
|
% key/value binary in the file.
|
|
write_key_value_pairs(Handle, KeyValueList) ->
|
|
{ok, Position} = file:position(Handle, cur),
|
|
HashTree = new_hashtree(),
|
|
write_key_value_pairs(Handle, KeyValueList, {Position, HashTree}).
|
|
|
|
write_key_value_pairs(_, [], Acc) ->
|
|
Acc;
|
|
write_key_value_pairs(Handle, [HeadPair|TailList], Acc) ->
|
|
{Key, Value} = HeadPair,
|
|
{Handle, NewPosition, HashTree} = put(Handle, Key, Value, Acc),
|
|
write_key_value_pairs(Handle, TailList, {NewPosition, HashTree}).
|
|
|
|
%% Write the actual hashtables at the bottom of the file. Each hash table
|
|
%% entry is a doubleword in length. The first word is the hash value
|
|
%% corresponding to a key and the second word is a file pointer to the
|
|
%% corresponding {key,value} tuple.
|
|
write_hash_tables(Handle, HashTree) ->
|
|
{ok, StartPos} = file:position(Handle, cur),
|
|
{IndexList, HashTreeBin} = hashtable_calc(HashTree, StartPos),
|
|
ok = perform_write_hash_tables(Handle, HashTreeBin, StartPos),
|
|
IndexList.
|
|
|
|
perform_write_hash_tables(Handle, HashTreeBin, StartPos) ->
|
|
SWW = os:timestamp(),
|
|
ok = file:write(Handle, HashTreeBin),
|
|
{ok, EndPos} = file:position(Handle, cur),
|
|
ok = file:advise(Handle, StartPos, EndPos - StartPos, will_need),
|
|
leveled_log:log_timer("CDB12", [], SWW),
|
|
ok.
|
|
|
|
|
|
%% Write the top most 255 doubleword entries. First word is the
|
|
%% file pointer to a hashtable and the second word is the number of entries
|
|
%% in the hash table
|
|
%% The List passed in should be made up of {Index, Position, Count} tuples
|
|
write_top_index_table(Handle, BasePos, IndexList) ->
|
|
FnWriteIndex = fun({_Index, Pos, Count}, {AccBin, CurrPos}) ->
|
|
case Count == 0 of
|
|
true ->
|
|
PosLE = endian_flip(CurrPos),
|
|
NextPos = CurrPos;
|
|
false ->
|
|
PosLE = endian_flip(Pos),
|
|
NextPos = Pos + (Count * ?DWORD_SIZE)
|
|
end,
|
|
CountLE = endian_flip(Count),
|
|
{<<AccBin/binary, PosLE:32, CountLE:32>>, NextPos}
|
|
end,
|
|
|
|
{IndexBin, _Pos} = lists:foldl(FnWriteIndex,
|
|
{<<>>, BasePos},
|
|
IndexList),
|
|
{ok, _} = file:position(Handle, 0),
|
|
ok = file:write(Handle, IndexBin),
|
|
ok = file:advise(Handle, 0, ?DWORD_SIZE * 256, will_need),
|
|
ok.
|
|
|
|
%% To make this compatible with original Bernstein format this endian flip
|
|
%% and also the use of the standard hash function required.
|
|
|
|
endian_flip(Int) ->
|
|
<<X:32/unsigned-little-integer>> = <<Int:32>>,
|
|
X.
|
|
|
|
hash(Key) ->
|
|
leveled_util:magic_hash(Key).
|
|
|
|
% Get the least significant 8 bits from the hash.
|
|
hash_to_index(Hash) ->
|
|
Hash band 255.
|
|
|
|
hash_to_slot(Hash, L) ->
|
|
(Hash bsr 8) rem L.
|
|
|
|
%% Create a binary of the LengthKeyLengthValue, adding a CRC check
|
|
%% at the front of the value
|
|
key_value_to_record({Key, Value}, BinaryMode) ->
|
|
BK = term_to_binary(Key),
|
|
BV = case BinaryMode of
|
|
true ->
|
|
Value;
|
|
false ->
|
|
term_to_binary(Value)
|
|
end,
|
|
KS = byte_size(BK),
|
|
VS = byte_size(BV),
|
|
KS_FL = endian_flip(KS),
|
|
VS_FL = endian_flip(VS + 4),
|
|
CRC = calc_crc(BK, BV),
|
|
<<KS_FL:32, VS_FL:32, BK:KS/binary, CRC:32/integer, BV:VS/binary>>.
|
|
|
|
|
|
multi_key_value_to_record(KVList, BinaryMode, LastPosition) ->
|
|
lists:foldl(fun({K, V}, {KPosL, Bin, _LK}) ->
|
|
Bin0 = key_value_to_record({K, V}, BinaryMode),
|
|
{[{K, byte_size(Bin) + LastPosition}|KPosL],
|
|
<<Bin/binary, Bin0/binary>>,
|
|
K} end,
|
|
{[], <<>>, empty},
|
|
KVList).
|
|
|
|
%%%============================================================================
|
|
%%% HashTree Implementation
|
|
%%%============================================================================
|
|
|
|
lookup_positions(HashTree, Index, Hash) ->
|
|
lookup_positions(HashTree, Index, Hash, -1, []).
|
|
|
|
lookup_positions(HashTree, Index, Hash, Pos, PosList) ->
|
|
case ets:next(HashTree, {Index, Hash, Pos}) of
|
|
{Index, Hash, NewPos} ->
|
|
lookup_positions(HashTree, Index, Hash, NewPos, [NewPos|PosList]);
|
|
_ ->
|
|
PosList
|
|
end.
|
|
|
|
add_position_tohashtree(HashTree, Index, Hash, Position) ->
|
|
ets:insert(HashTree, {{Index, Hash, Position}}),
|
|
HashTree.
|
|
|
|
new_hashtree() ->
|
|
ets:new(hashtree, [ordered_set]).
|
|
|
|
to_list(HashTree, Index) ->
|
|
to_list(HashTree, Index, {0, -1}, []).
|
|
|
|
to_list(HashTree, Index, {LastHash, LastPos}, Acc) ->
|
|
case ets:next(HashTree, {Index, LastHash, LastPos}) of
|
|
{Index, Hash, Pos} ->
|
|
to_list(HashTree, Index, {Hash, Pos}, [{Hash, Pos}|Acc]);
|
|
_ ->
|
|
Acc
|
|
end.
|
|
|
|
to_slotmap(HashTree, Index) ->
|
|
HPList = to_list(HashTree, Index),
|
|
IndexLength = length(HPList) * 2,
|
|
ConvertObjFun =
|
|
fun({Hash, Position}) ->
|
|
HashLE = endian_flip(Hash),
|
|
PosLE = endian_flip(Position),
|
|
NewBin = <<HashLE:32, PosLE:32>>,
|
|
{hash_to_slot(Hash, IndexLength), NewBin}
|
|
end,
|
|
lists:map(ConvertObjFun, HPList).
|
|
|
|
build_hashtree_binary(SlotMap, IndexLength) ->
|
|
build_hashtree_binary(SlotMap, IndexLength, 0, []).
|
|
|
|
build_hashtree_binary([], IdxLen, SlotPos, Bin) ->
|
|
case SlotPos of
|
|
IdxLen ->
|
|
lists:reverse(Bin);
|
|
N when N < IdxLen ->
|
|
ZeroLen = (IdxLen - N) * 64,
|
|
lists:reverse([<<0:ZeroLen>>|Bin])
|
|
end;
|
|
build_hashtree_binary([{TopSlot, TopBin}|SlotMapTail], IdxLen, SlotPos, Bin) ->
|
|
case TopSlot of
|
|
N when N > SlotPos ->
|
|
D = N - SlotPos,
|
|
Bridge = lists:duplicate(D, <<0:64>>) ++ Bin,
|
|
UpdBin = [<<TopBin/binary>>|Bridge],
|
|
build_hashtree_binary(SlotMapTail,
|
|
IdxLen,
|
|
SlotPos + D + 1,
|
|
UpdBin);
|
|
N when N =< SlotPos, SlotPos < IdxLen ->
|
|
UpdBin = [<<TopBin/binary>>|Bin],
|
|
build_hashtree_binary(SlotMapTail,
|
|
IdxLen,
|
|
SlotPos + 1,
|
|
UpdBin);
|
|
N when N < SlotPos, SlotPos == IdxLen ->
|
|
% Need to wrap round and put in the first empty slot from the
|
|
% beginning
|
|
Pos = find_firstzero(Bin, length(Bin)),
|
|
{LHS, [<<0:64>>|RHS]} = lists:split(Pos - 1, Bin),
|
|
UpdBin = lists:append(LHS, [TopBin|RHS]),
|
|
build_hashtree_binary(SlotMapTail,
|
|
IdxLen,
|
|
SlotPos,
|
|
UpdBin)
|
|
end.
|
|
|
|
|
|
% Search from the tail of the list to find the first zero
|
|
find_firstzero(Bin, Pos) ->
|
|
case lists:nth(Pos, Bin) of
|
|
<<0:64>> ->
|
|
Pos;
|
|
_ ->
|
|
find_firstzero(Bin, Pos - 1)
|
|
end.
|
|
|
|
|
|
write_hash_tables(Indexes, HashTree, CurrPos) ->
|
|
write_hash_tables(Indexes, HashTree, CurrPos, CurrPos, [], [], {0, 0, 0}).
|
|
|
|
write_hash_tables([], _HashTree, _CurrPos, _BasePos,
|
|
IndexList, HT_BinList, {T1, T2, T3}) ->
|
|
leveled_log:log("CDB14", [T1, T2, T3]),
|
|
IL = lists:reverse(IndexList),
|
|
{IL, list_to_binary(HT_BinList)};
|
|
write_hash_tables([Index|Rest], HashTree, CurrPos, BasePos,
|
|
IndexList, HT_BinList, Timers) ->
|
|
SW1 = os:timestamp(),
|
|
SlotMap = to_slotmap(HashTree, Index),
|
|
T1 = timer:now_diff(os:timestamp(), SW1) + element(1, Timers),
|
|
case SlotMap of
|
|
[] ->
|
|
write_hash_tables(Rest,
|
|
HashTree,
|
|
CurrPos,
|
|
BasePos,
|
|
[{Index, BasePos, 0}|IndexList],
|
|
HT_BinList,
|
|
Timers);
|
|
_ ->
|
|
SW2 = os:timestamp(),
|
|
IndexLength = length(SlotMap) * 2,
|
|
SortedMap = lists:keysort(1, SlotMap),
|
|
T2 = timer:now_diff(os:timestamp(), SW2) + element(2, Timers),
|
|
SW3 = os:timestamp(),
|
|
NewSlotBin = build_hashtree_binary(SortedMap, IndexLength),
|
|
T3 = timer:now_diff(os:timestamp(), SW3) + element(3, Timers),
|
|
write_hash_tables(Rest,
|
|
HashTree,
|
|
CurrPos + IndexLength * ?DWORD_SIZE,
|
|
BasePos,
|
|
[{Index, CurrPos, IndexLength}|IndexList],
|
|
HT_BinList ++ NewSlotBin,
|
|
{T1, T2, T3})
|
|
end.
|
|
|
|
|
|
|
|
%%%%%%%%%%%%%%%%
|
|
% T E S T
|
|
%%%%%%%%%%%%%%%
|
|
-ifdef(TEST).
|
|
|
|
%%
|
|
%% dump(FileName) -> List
|
|
%% Given a file name, this function returns a list
|
|
%% of {key,value} tuples from the CDB.
|
|
%%
|
|
|
|
|
|
%% from_dict(FileName,ListOfKeyValueTuples)
|
|
%% Given a filename and a dictionary, create a cdb
|
|
%% using the key value pairs from the dict.
|
|
from_dict(FileName,Dict) ->
|
|
KeyValueList = dict:to_list(Dict),
|
|
create(FileName, KeyValueList).
|
|
|
|
|
|
%%
|
|
%% create(FileName,ListOfKeyValueTuples) -> ok
|
|
%% Given a filename and a list of {key,value} tuples,
|
|
%% this function creates a CDB
|
|
%%
|
|
create(FileName,KeyValueList) ->
|
|
{ok, Handle} = file:open(FileName, ?WRITE_OPS),
|
|
{ok, _} = file:position(Handle, {bof, ?BASE_POSITION}),
|
|
{BasePos, HashTree} = write_key_value_pairs(Handle, KeyValueList),
|
|
close_file(Handle, HashTree, BasePos).
|
|
|
|
|
|
%% Should not be used for non-test PUTs by the inker - as the Max File Size
|
|
%% should be taken from the startup options not the default
|
|
put(FileName, Key, Value, {LastPosition, HashTree}) ->
|
|
put(FileName, Key, Value, {LastPosition, HashTree},
|
|
?BINARY_MODE, ?MAX_FILE_SIZE, false).
|
|
|
|
|
|
dump(FileName) ->
|
|
{ok, Handle} = file:open(FileName, [binary, raw, read]),
|
|
Fn = fun(Index, Acc) ->
|
|
{ok, _} = file:position(Handle, ?DWORD_SIZE * Index),
|
|
{_, Count} = read_next_2_integers(Handle),
|
|
Acc + Count
|
|
end,
|
|
NumberOfPairs = lists:foldl(Fn, 0, lists:seq(0,255)) bsr 1,
|
|
io:format("Count of keys in db is ~w~n", [NumberOfPairs]),
|
|
{ok, _} = file:position(Handle, {bof, ?BASE_POSITION}),
|
|
Fn1 = fun(_I, Acc) ->
|
|
{KL, VL} = read_next_2_integers(Handle),
|
|
{Key, KB} = safe_read_next_keybin(Handle, KL),
|
|
Value =
|
|
case checkread_next_value(Handle, VL, KB) of
|
|
{true, V0} ->
|
|
binary_to_term(V0)
|
|
end,
|
|
{Key, Value} = get(Handle, Key, false),
|
|
[{Key,Value} | Acc]
|
|
end,
|
|
lists:foldr(Fn1, [], lists:seq(0, NumberOfPairs-1)).
|
|
|
|
%%
|
|
%% to_dict(FileName)
|
|
%% Given a filename returns a dict containing
|
|
%% the key value pairs from the dict.
|
|
%%
|
|
%% @spec to_dict(filename()) -> dictionary()
|
|
%% where
|
|
%% filename() = string(),
|
|
%% dictionary() = dict()
|
|
%%
|
|
to_dict(FileName) ->
|
|
KeyValueList = dump(FileName),
|
|
dict:from_list(KeyValueList).
|
|
|
|
|
|
build_hashtree_bunchedatend_binary_test() ->
|
|
SlotMap = [{1, <<10:32, 0:32>>},
|
|
{4, <<11:32, 100:32>>},
|
|
{8, <<12:32, 200:32>>},
|
|
{8, <<13:32, 300:32>>},
|
|
{14, <<14:32, 400:32>>},
|
|
{14, <<15:32, 500:32>>},
|
|
{15, <<16:32, 600:32>>},
|
|
{15, <<17:32, 700:32>>}],
|
|
Bin = list_to_binary(build_hashtree_binary(SlotMap, 16)),
|
|
ExpBinP1 = <<16:32, 600:32, 10:32, 0:32, 17:32, 700:32, 0:64>>,
|
|
ExpBinP2 = <<11:32, 100:32, 0:192, 12:32, 200:32, 13:32, 300:32, 0:256>>,
|
|
ExpBinP3 = <<14:32, 400:32, 15:32, 500:32>>,
|
|
ExpBin = <<ExpBinP1/binary, ExpBinP2/binary, ExpBinP3/binary>>,
|
|
?assertMatch(ExpBin, Bin).
|
|
|
|
build_hashtree_bunchedatstart_binary_test() ->
|
|
SlotMap = [{1, <<10:32, 0:32>>},
|
|
{2, <<11:32, 100:32>>},
|
|
{3, <<12:32, 200:32>>},
|
|
{4, <<13:32, 300:32>>},
|
|
{5, <<14:32, 400:32>>},
|
|
{6, <<15:32, 500:32>>},
|
|
{7, <<16:32, 600:32>>},
|
|
{8, <<17:32, 700:32>>}],
|
|
Bin = list_to_binary(build_hashtree_binary(SlotMap, 16)),
|
|
ExpBinP1 = <<0:64, 10:32, 0:32, 11:32, 100:32, 12:32, 200:32>>,
|
|
ExpBinP2 = <<13:32, 300:32, 14:32, 400:32, 15:32, 500:32, 16:32, 600:32>>,
|
|
ExpBinP3 = <<17:32, 700:32, 0:448>>,
|
|
ExpBin = <<ExpBinP1/binary, ExpBinP2/binary, ExpBinP3/binary>>,
|
|
ExpSize = byte_size(ExpBin),
|
|
?assertMatch(ExpSize, byte_size(Bin)),
|
|
?assertMatch(ExpBin, Bin).
|
|
|
|
|
|
build_hashtree_test() ->
|
|
SlotMap = [{3, <<2424914688:32, 100:32>>},
|
|
{3, <<2424917760:32, 200:32>>},
|
|
{7, <<2424915712:32, 300:32>>},
|
|
{9, <<2424903936:32, 400:32>>},
|
|
{9, <<2424907008:32, 500:32>>},
|
|
{10, <<2424913408:32, 600:32>>}],
|
|
BinList = build_hashtree_binary(SlotMap, 12),
|
|
ExpOut = [<<0:64>>, <<0:64>>, <<0:64>>, <<2424914688:32, 100:32>>] ++
|
|
[<<2424917760:32, 200:32>>, <<0:64>>, <<0:64>>] ++
|
|
[<<2424915712:32, 300:32>>, <<0:64>>] ++
|
|
[<<2424903936:32, 400:32>>, <<2424907008:32, 500:32>>] ++
|
|
[<<2424913408:32, 600:32>>],
|
|
?assertMatch(ExpOut, BinList).
|
|
|
|
|
|
find_firstzero_test() ->
|
|
Bin = [<<1:64/integer>>, <<0:64/integer>>,
|
|
<<89:64/integer>>, <<89:64/integer>>,
|
|
<<0:64/integer>>,
|
|
<<71:64/integer>>, <<72:64/integer>>],
|
|
?assertMatch(5, find_firstzero(Bin, length(Bin))),
|
|
{LHS, [<<0:64>>|RHS]} = lists:split(4, Bin),
|
|
?assertMatch([<<1:64/integer>>, <<0:64/integer>>,
|
|
<<89:64/integer>>, <<89:64/integer>>], LHS),
|
|
?assertMatch([<<71:64/integer>>, <<72:64/integer>>], RHS).
|
|
|
|
|
|
cyclecount_test() ->
|
|
io:format("~n~nStarting cycle count test~n"),
|
|
KVL1 = generate_sequentialkeys(5000, []),
|
|
KVL2 = lists:foldl(fun({K, V}, Acc) ->
|
|
H = hash(K),
|
|
I = hash_to_index(H),
|
|
case I of
|
|
0 ->
|
|
[{K, V}|Acc];
|
|
_ ->
|
|
Acc
|
|
end end,
|
|
[],
|
|
KVL1),
|
|
{ok, P1} = cdb_open_writer("test/test_area/cycle_count.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
ok = cdb_mput(P1, KVL2),
|
|
{ok, F2} = cdb_complete(P1),
|
|
{ok, P2} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
lists:foreach(fun({K, V}) ->
|
|
?assertMatch({K, V}, cdb_get(P2, K)) end,
|
|
KVL2),
|
|
% Test many missing keys
|
|
lists:foreach(fun(X) ->
|
|
K = "NotKey" ++ integer_to_list(X),
|
|
?assertMatch(missing, cdb_get(P2, K))
|
|
end,
|
|
lists:seq(1, 5000)),
|
|
|
|
ok = cdb_close(P2),
|
|
ok = file:delete("test/test_area/cycle_count.cdb").
|
|
|
|
|
|
full_1_test() ->
|
|
List1 = lists:sort([{"key1","value1"},{"key2","value2"}]),
|
|
create("test/test_area/simple.cdb",
|
|
lists:sort([{"key1","value1"},{"key2","value2"}])),
|
|
List2 = lists:sort(dump("test/test_area/simple.cdb")),
|
|
?assertMatch(List1,List2),
|
|
ok = file:delete("test/test_area/simple.cdb").
|
|
|
|
full_2_test() ->
|
|
List1 = lists:sort([{lists:flatten(io_lib:format("~s~p",[Prefix,Plug])),
|
|
lists:flatten(io_lib:format("value~p",[Plug]))}
|
|
|| Plug <- lists:seq(1,200),
|
|
Prefix <- ["dsd","so39ds","oe9%#*(","020dkslsldclsldowlslf%$#",
|
|
"tiep4||","qweq"]]),
|
|
create("test/test_area/full.cdb",List1),
|
|
List2 = lists:sort(dump("test/test_area/full.cdb")),
|
|
?assertMatch(List1,List2),
|
|
ok = file:delete("test/test_area/full.cdb").
|
|
|
|
from_dict_test() ->
|
|
D = dict:new(),
|
|
D1 = dict:store("a","b",D),
|
|
D2 = dict:store("c","d",D1),
|
|
ok = from_dict("test/test_area/from_dict_test.cdb",D2),
|
|
io:format("Store created ~n", []),
|
|
KVP = lists:sort(dump("test/test_area/from_dict_test.cdb")),
|
|
D3 = lists:sort(dict:to_list(D2)),
|
|
io:format("KVP is ~w~n", [KVP]),
|
|
io:format("D3 is ~w~n", [D3]),
|
|
?assertMatch(KVP, D3),
|
|
ok = file:delete("test/test_area/from_dict_test.cdb").
|
|
|
|
to_dict_test() ->
|
|
D = dict:new(),
|
|
D1 = dict:store("a","b",D),
|
|
D2 = dict:store("c","d",D1),
|
|
ok = from_dict("test/test_area/from_dict_test1.cdb",D2),
|
|
Dict = to_dict("test/test_area/from_dict_test1.cdb"),
|
|
D3 = lists:sort(dict:to_list(D2)),
|
|
D4 = lists:sort(dict:to_list(Dict)),
|
|
?assertMatch(D4,D3),
|
|
ok = file:delete("test/test_area/from_dict_test1.cdb").
|
|
|
|
crccheck_emptyvalue_test() ->
|
|
?assertMatch(false, crccheck(<<>>, <<"Key">>)).
|
|
|
|
crccheck_shortvalue_test() ->
|
|
Value = <<128,128,32>>,
|
|
?assertMatch(false, crccheck(Value, <<"Key">>)).
|
|
|
|
crccheck_justshortvalue_test() ->
|
|
Value = <<128,128,32,64>>,
|
|
?assertMatch(false, crccheck(Value, <<"Key">>)).
|
|
|
|
crccheck_wronghash_test() ->
|
|
Value = term_to_binary("some text as value"),
|
|
Key = <<"K">>,
|
|
BadHash = erlang:crc32(<<Key/binary, Value/binary, 1:8/integer>>),
|
|
GoodHash = erlang:crc32(<<Key/binary, Value/binary>>),
|
|
GValueOnDisk = <<GoodHash:32/integer, Value/binary>>,
|
|
BValueOnDisk = <<BadHash:32/integer, Value/binary>>,
|
|
?assertMatch(false, crccheck(BValueOnDisk, Key)),
|
|
?assertMatch(Value, crccheck(GValueOnDisk, Key)).
|
|
|
|
crccheck_truncatedvalue_test() ->
|
|
Value = term_to_binary("some text as value"),
|
|
Key = <<"K">>,
|
|
Hash = erlang:crc32(<<Key/binary, Value/binary>>),
|
|
ValueOnDisk = <<Hash:32/integer, Value/binary>>,
|
|
Size = bit_size(ValueOnDisk) - 1,
|
|
<<TruncatedValue:Size/bitstring, _/bitstring>> = ValueOnDisk,
|
|
?assertMatch(false, crccheck(TruncatedValue, Key)),
|
|
?assertMatch(Value, crccheck(ValueOnDisk, Key)).
|
|
|
|
activewrite_singlewrite_test() ->
|
|
Key = "0002",
|
|
Value = "some text as new value",
|
|
InitialD = dict:new(),
|
|
InitialD1 = dict:store("0001", "Initial value", InitialD),
|
|
ok = from_dict("test/test_area/test_mem.cdb", InitialD1),
|
|
io:format("New db file created ~n", []),
|
|
{LastPosition, KeyDict, _} =
|
|
open_active_file("test/test_area/test_mem.cdb"),
|
|
io:format("File opened as new active file "
|
|
"with LastPosition=~w ~n", [LastPosition]),
|
|
{_, _, UpdKeyDict} = put("test/test_area/test_mem.cdb",
|
|
Key, Value,
|
|
{LastPosition, KeyDict}),
|
|
io:format("New key and value added to active file ~n", []),
|
|
?assertMatch({Key, Value},
|
|
get_mem(Key,
|
|
"test/test_area/test_mem.cdb",
|
|
UpdKeyDict,
|
|
false)),
|
|
?assertMatch(probably,
|
|
get_mem(Key,
|
|
"test/test_area/test_mem.cdb",
|
|
UpdKeyDict,
|
|
false,
|
|
loose_presence)),
|
|
?assertMatch(missing,
|
|
get_mem("not_present",
|
|
"test/test_area/test_mem.cdb",
|
|
UpdKeyDict,
|
|
false,
|
|
loose_presence)),
|
|
ok = file:delete("test/test_area/test_mem.cdb").
|
|
|
|
search_hash_table_findinslot_test() ->
|
|
Key1 = "key1", % this is in slot 3 if count is 8
|
|
D = dict:from_list([{Key1, "value1"}, {"K2", "V2"}, {"K3", "V3"},
|
|
{"K4", "V4"}, {"K5", "V5"}, {"K6", "V6"}, {"K7", "V7"},
|
|
{"K8", "V8"}]),
|
|
ok = from_dict("test/test_area/hashtable1_test.cdb",D),
|
|
{ok, Handle} = file:open("test/test_area/hashtable1_test.cdb",
|
|
[binary, raw, read, write]),
|
|
Hash = hash(Key1),
|
|
Index = hash_to_index(Hash),
|
|
{ok, _} = file:position(Handle, {bof, ?DWORD_SIZE*Index}),
|
|
{HashTable, Count} = read_next_2_integers(Handle),
|
|
io:format("Count of ~w~n", [Count]),
|
|
{ok, FirstHashPosition} = file:position(Handle, {bof, HashTable}),
|
|
Slot = hash_to_slot(Hash, Count),
|
|
io:format("Slot of ~w~n", [Slot]),
|
|
{ok, _} = file:position(Handle, {cur, Slot * ?DWORD_SIZE}),
|
|
{ReadH3, ReadP3} = read_next_2_integers(Handle),
|
|
{ReadH4, ReadP4} = read_next_2_integers(Handle),
|
|
io:format("Slot 1 has Hash ~w Position ~w~n", [ReadH3, ReadP3]),
|
|
io:format("Slot 2 has Hash ~w Position ~w~n", [ReadH4, ReadP4]),
|
|
?assertMatch(0, ReadH4),
|
|
?assertMatch({"key1", "value1"}, get(Handle, Key1, false)),
|
|
?assertMatch({no_timing, probably},
|
|
get(Handle, Key1,
|
|
no_cache, loose_presence, false, no_timing)),
|
|
?assertMatch({no_timing, missing},
|
|
get(Handle, "Key99",
|
|
no_cache, loose_presence, false, no_timing)),
|
|
{ok, _} = file:position(Handle, FirstHashPosition),
|
|
FlipH3 = endian_flip(ReadH3),
|
|
FlipP3 = endian_flip(ReadP3),
|
|
RBin = <<FlipH3:32/integer,
|
|
FlipP3:32/integer,
|
|
0:32/integer,
|
|
0:32/integer>>,
|
|
io:format("Replacement binary of ~w~n", [RBin]),
|
|
{ok, OldBin} = file:pread(Handle,
|
|
FirstHashPosition + (Slot -1) * ?DWORD_SIZE, 16),
|
|
io:format("Bin to be replaced is ~w ~n", [OldBin]),
|
|
ok = file:pwrite(Handle,
|
|
FirstHashPosition + (Slot -1) * ?DWORD_SIZE,
|
|
RBin),
|
|
ok = file:close(Handle),
|
|
io:format("Find key following change to hash table~n"),
|
|
?assertMatch(missing, get("test/test_area/hashtable1_test.cdb", Key1, false)),
|
|
ok = file:delete("test/test_area/hashtable1_test.cdb").
|
|
|
|
newactivefile_test() ->
|
|
{LastPosition, _, _} = open_active_file("test/test_area/activefile_test.cdb"),
|
|
?assertMatch(256 * ?DWORD_SIZE, LastPosition),
|
|
ok = file:delete("test/test_area/activefile_test.cdb").
|
|
|
|
emptyvalue_fromdict_test() ->
|
|
D = dict:new(),
|
|
D1 = dict:store("K1", "V1", D),
|
|
D2 = dict:store("K2", "", D1),
|
|
D3 = dict:store("K3", "V3", D2),
|
|
D4 = dict:store("K4", "", D3),
|
|
ok = from_dict("test/test_area/from_dict_test_ev.cdb",D4),
|
|
io:format("Store created ~n", []),
|
|
KVP = lists:sort(dump("test/test_area/from_dict_test_ev.cdb")),
|
|
D_Result = lists:sort(dict:to_list(D4)),
|
|
io:format("KVP is ~w~n", [KVP]),
|
|
io:format("D_Result is ~w~n", [D_Result]),
|
|
?assertMatch(KVP, D_Result),
|
|
ok = file:delete("test/test_area/from_dict_test_ev.cdb").
|
|
|
|
|
|
empty_roll_test() ->
|
|
file:delete("test/test_area/empty_roll.cdb"),
|
|
file:delete("test/test_area/empty_roll.pnd"),
|
|
{ok, P1} = cdb_open_writer("test/test_area/empty_roll.pnd",
|
|
#cdb_options{binary_mode=true}),
|
|
ok = cdb_roll(P1),
|
|
true = finished_rolling(P1),
|
|
{ok, P2} = cdb_open_reader("test/test_area/empty_roll.cdb",
|
|
#cdb_options{binary_mode=true}),
|
|
ok = cdb_close(P2),
|
|
ok = file:delete("test/test_area/empty_roll.cdb").
|
|
|
|
find_lastkey_test() ->
|
|
file:delete("test/test_area/lastkey.pnd"),
|
|
{ok, P1} = cdb_open_writer("test/test_area/lastkey.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
ok = cdb_put(P1, "Key1", "Value1"),
|
|
ok = cdb_put(P1, "Key3", "Value3"),
|
|
ok = cdb_put(P1, "Key2", "Value2"),
|
|
?assertMatch("Key2", cdb_lastkey(P1)),
|
|
?assertMatch("Key1", cdb_firstkey(P1)),
|
|
probably = cdb_keycheck(P1, "Key2"),
|
|
ok = cdb_close(P1),
|
|
{ok, P2} = cdb_open_writer("test/test_area/lastkey.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
?assertMatch("Key2", cdb_lastkey(P2)),
|
|
probably = cdb_keycheck(P2, "Key2"),
|
|
{ok, F2} = cdb_complete(P2),
|
|
{ok, P3} = cdb_open_reader(F2),
|
|
?assertMatch("Key2", cdb_lastkey(P3)),
|
|
{ok, _FN} = cdb_complete(P3),
|
|
{ok, P4} = cdb_open_reader(F2),
|
|
?assertMatch("Key2", cdb_lastkey(P4)),
|
|
ok = cdb_close(P4),
|
|
ok = file:delete("test/test_area/lastkey.cdb").
|
|
|
|
get_keys_byposition_simple_test() ->
|
|
{ok, P1} = cdb_open_writer("test/test_area/poskey.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
ok = cdb_put(P1, "Key1", "Value1"),
|
|
ok = cdb_put(P1, "Key3", "Value3"),
|
|
ok = cdb_put(P1, "Key2", "Value2"),
|
|
KeyList = ["Key1", "Key2", "Key3"],
|
|
{ok, F2} = cdb_complete(P1),
|
|
{ok, P2} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
PositionList = cdb_getpositions(P2, all),
|
|
io:format("Position list of ~w~n", [PositionList]),
|
|
?assertMatch(3, length(PositionList)),
|
|
R1 = cdb_directfetch(P2, PositionList, key_only),
|
|
io:format("R1 ~w~n", [R1]),
|
|
?assertMatch(3, length(R1)),
|
|
lists:foreach(fun(Key) ->
|
|
?assertMatch(true, lists:member(Key, KeyList)) end,
|
|
R1),
|
|
R2 = cdb_directfetch(P2, PositionList, key_size),
|
|
?assertMatch(3, length(R2)),
|
|
lists:foreach(fun({Key, _Size}) ->
|
|
?assertMatch(true, lists:member(Key, KeyList)) end,
|
|
R2),
|
|
R3 = cdb_directfetch(P2, PositionList, key_value_check),
|
|
?assertMatch(3, length(R3)),
|
|
lists:foreach(fun({Key, Value, Check}) ->
|
|
?assertMatch(true, Check),
|
|
{K, V} = cdb_get(P2, Key),
|
|
?assertMatch(K, Key),
|
|
?assertMatch(V, Value) end,
|
|
R3),
|
|
ok = cdb_close(P2),
|
|
ok = file:delete(F2).
|
|
|
|
generate_sequentialkeys(0, KVList) ->
|
|
lists:reverse(KVList);
|
|
generate_sequentialkeys(Count, KVList) ->
|
|
KV = {"Key" ++ integer_to_list(Count), "Value" ++ integer_to_list(Count)},
|
|
generate_sequentialkeys(Count - 1, KVList ++ [KV]).
|
|
|
|
get_keys_byposition_manykeys_test_() ->
|
|
{timeout, 600, fun get_keys_byposition_manykeys_test_to/0}.
|
|
|
|
get_keys_byposition_manykeys_test_to() ->
|
|
KeyCount = ?KEYCOUNT,
|
|
{ok, P1} = cdb_open_writer("test/test_area/poskeymany.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
KVList = generate_sequentialkeys(KeyCount, []),
|
|
lists:foreach(fun({K, V}) -> cdb_put(P1, K, V) end, KVList),
|
|
ok = cdb_roll(P1),
|
|
% Should not return positions when rolling
|
|
% There is an implicit race here - if cdb_roll is too fast, then the test
|
|
% will fail. It appears to be safe that if KeyCount is set to a high value
|
|
% (e.g. > 10K) it is implausible that cdb_roll will ever finish before the
|
|
% call to cdb_getpositions is executed. So the race is tolerated
|
|
?assertMatch([], cdb_getpositions(P1, 10)),
|
|
lists:foldl(fun(X, Complete) ->
|
|
case Complete of
|
|
true ->
|
|
true;
|
|
false ->
|
|
case cdb_checkhashtable(P1) of
|
|
true ->
|
|
true;
|
|
false ->
|
|
timer:sleep(X),
|
|
false
|
|
end
|
|
end end,
|
|
false,
|
|
lists:seq(1, 30)),
|
|
?assertMatch(10, length(cdb_getpositions(P1, 10))),
|
|
{ok, F2} = cdb_complete(P1),
|
|
|
|
{ok, P2} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
PositionList = cdb_getpositions(P2, all),
|
|
L1 = length(PositionList),
|
|
io:format("Length of all positions ~w~n", [L1]),
|
|
?assertMatch(KeyCount, L1),
|
|
|
|
SampleList1 = cdb_getpositions(P2, 10),
|
|
?assertMatch(10, length(SampleList1)),
|
|
SampleList2 = cdb_getpositions(P2, KeyCount),
|
|
?assertMatch(KeyCount, length(SampleList2)),
|
|
SampleList3 = cdb_getpositions(P2, KeyCount + 1),
|
|
?assertMatch(KeyCount, length(SampleList3)),
|
|
|
|
ok = cdb_close(P2),
|
|
ok = file:delete(F2).
|
|
|
|
|
|
nokeys_test() ->
|
|
{ok, P1} = cdb_open_writer("test/test_area/nohash_emptyfile.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
{ok, F2} = cdb_complete(P1),
|
|
{ok, P2} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
io:format("FirstKey is ~s~n", [cdb_firstkey(P2)]),
|
|
io:format("LastKey is ~s~n", [cdb_lastkey(P2)]),
|
|
?assertMatch(empty, cdb_firstkey(P2)),
|
|
?assertMatch(empty, cdb_lastkey(P2)),
|
|
ok = cdb_close(P2),
|
|
ok = file:delete(F2).
|
|
|
|
mput_test() ->
|
|
KeyCount = 1024,
|
|
{ok, P1} = cdb_open_writer("test/test_area/nohash_keysinfile.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
KVList = generate_sequentialkeys(KeyCount, []),
|
|
ok = cdb_mput(P1, KVList),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
?assertMatch({"Key1024", "Value1024"}, cdb_get(P1, "Key1024")),
|
|
?assertMatch(missing, cdb_get(P1, "Key1025")),
|
|
?assertMatch(missing, cdb_get(P1, "Key1026")),
|
|
{ok, F2} = cdb_complete(P1),
|
|
{ok, P2} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
?assertMatch("Key1", cdb_firstkey(P2)),
|
|
?assertMatch("Key1024", cdb_lastkey(P2)),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P2, "Key1")),
|
|
?assertMatch({"Key1024", "Value1024"}, cdb_get(P2, "Key1024")),
|
|
?assertMatch(missing, cdb_get(P2, "Key1025")),
|
|
?assertMatch(missing, cdb_get(P2, "Key1026")),
|
|
ok = cdb_close(P2),
|
|
ok = file:delete(F2).
|
|
|
|
state_test() ->
|
|
{ok, P1} = cdb_open_writer("test/test_area/state_test.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
KVList = generate_sequentialkeys(1000, []),
|
|
ok = cdb_mput(P1, KVList),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
ok = cdb_roll(P1),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
ok = cdb_deletepending(P1),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
timer:sleep(500),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
ok = cdb_close(P1).
|
|
|
|
|
|
hashclash_test() ->
|
|
{ok, P1} = cdb_open_writer("test/test_area/hashclash_test.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
Key1 = "Key4184465780",
|
|
Key99 = "Key4254669179",
|
|
KeyNF = "Key9070567319",
|
|
?assertMatch(22, hash(Key1)),
|
|
?assertMatch(22, hash(Key99)),
|
|
?assertMatch(22, hash(KeyNF)),
|
|
|
|
ok = cdb_mput(P1, [{Key1, 1}, {Key99, 99}]),
|
|
|
|
?assertMatch(probably, cdb_keycheck(P1, Key1)),
|
|
?assertMatch(probably, cdb_keycheck(P1, Key99)),
|
|
?assertMatch(probably, cdb_keycheck(P1, KeyNF)),
|
|
|
|
?assertMatch({Key1, 1}, cdb_get(P1, Key1)),
|
|
?assertMatch({Key99, 99}, cdb_get(P1, Key99)),
|
|
?assertMatch(missing, cdb_get(P1, KeyNF)),
|
|
|
|
{ok, FN} = cdb_complete(P1),
|
|
{ok, P2} = cdb_open_reader(FN, #cdb_options{binary_mode=false}),
|
|
|
|
?assertMatch(probably, cdb_keycheck(P2, Key1)),
|
|
?assertMatch(probably, cdb_keycheck(P2, Key99)),
|
|
?assertMatch(probably, cdb_keycheck(P2, KeyNF)),
|
|
|
|
?assertMatch({Key1, 1}, cdb_get(P2, Key1)),
|
|
?assertMatch({Key99, 99}, cdb_get(P2, Key99)),
|
|
?assertMatch(missing, cdb_get(P2, KeyNF)),
|
|
|
|
ok = cdb_deletepending(P2),
|
|
|
|
?assertMatch(probably, cdb_keycheck(P2, Key1)),
|
|
?assertMatch(probably, cdb_keycheck(P2, Key99)),
|
|
?assertMatch(probably, cdb_keycheck(P2, KeyNF)),
|
|
|
|
?assertMatch({Key1, 1}, cdb_get(P2, Key1)),
|
|
?assertMatch({Key99, 99}, cdb_get(P2, Key99)),
|
|
?assertMatch(missing, cdb_get(P2, KeyNF)),
|
|
|
|
ok = cdb_close(P2).
|
|
|
|
corruptfile_test() ->
|
|
file:delete("test/test_area/corrupt_test.pnd"),
|
|
{ok, P1} = cdb_open_writer("test/test_area/corrupt_test.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
KVList = generate_sequentialkeys(100, []),
|
|
ok = cdb_mput(P1, []), % Not relevant to this test, but needs testing
|
|
lists:foreach(fun({K, V}) -> cdb_put(P1, K, V) end, KVList),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P1, "Key100")),
|
|
ok = cdb_close(P1),
|
|
lists:foreach(fun(Offset) -> corrupt_testfile_at_offset(Offset) end,
|
|
lists:seq(1, 40)),
|
|
ok = file:delete("test/test_area/corrupt_test.pnd").
|
|
|
|
corrupt_testfile_at_offset(Offset) ->
|
|
{ok, F1} = file:open("test/test_area/corrupt_test.pnd", ?WRITE_OPS),
|
|
{ok, EofPos} = file:position(F1, eof),
|
|
file:position(F1, EofPos - Offset),
|
|
ok = file:truncate(F1),
|
|
ok = file:close(F1),
|
|
{ok, P2} = cdb_open_writer("test/test_area/corrupt_test.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
?assertMatch(probably, cdb_keycheck(P2, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P2, "Key1")),
|
|
?assertMatch(missing, cdb_get(P2, "Key100")),
|
|
ok = cdb_put(P2, "Key100", "Value100"),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P2, "Key100")),
|
|
ok = cdb_close(P2).
|
|
|
|
crc_corrupt_writer_test() ->
|
|
file:delete("test/test_area/corruptwrt_test.pnd"),
|
|
{ok, P1} = cdb_open_writer("test/test_area/corruptwrt_test.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
KVList = generate_sequentialkeys(100, []),
|
|
ok = cdb_mput(P1, KVList),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P1, "Key100")),
|
|
ok = cdb_close(P1),
|
|
{ok, Handle} = file:open("test/test_area/corruptwrt_test.pnd", ?WRITE_OPS),
|
|
{ok, EofPos} = file:position(Handle, eof),
|
|
% zero the last byte of the last value
|
|
ok = file:pwrite(Handle, EofPos - 5, <<0:8/integer>>),
|
|
ok = file:close(Handle),
|
|
{ok, P2} = cdb_open_writer("test/test_area/corruptwrt_test.pnd",
|
|
#cdb_options{binary_mode=false}),
|
|
?assertMatch(probably, cdb_keycheck(P2, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P2, "Key1")),
|
|
?assertMatch(missing, cdb_get(P2, "Key100")),
|
|
ok = cdb_put(P2, "Key100", "Value100"),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P2, "Key100")),
|
|
ok = cdb_close(P2).
|
|
|
|
safe_read_test() ->
|
|
% should return the right thing or false, or the wrong thing if and
|
|
% only if we understand why
|
|
Key = term_to_binary(<<"Key">>),
|
|
Value = <<"Value">>,
|
|
CRC = calc_crc(Key, Value),
|
|
ValToWrite = <<CRC:32/integer, Value/binary>>,
|
|
KeyL = byte_size(Key),
|
|
FlippedKeyL = endian_flip(KeyL),
|
|
ValueL= byte_size(ValToWrite),
|
|
FlippedValL = endian_flip(ValueL),
|
|
|
|
TestFN = "test/test_area/saferead.pnd",
|
|
BinToWrite =
|
|
<<FlippedKeyL:32/integer,
|
|
FlippedValL:32/integer,
|
|
Key/binary,
|
|
ValToWrite/binary>>,
|
|
|
|
TestCorruptedWriteFun =
|
|
fun(BitNumber) ->
|
|
<<PreBin:BitNumber/bitstring,
|
|
Bit:1/integer,
|
|
PostBin/bitstring>> = BinToWrite,
|
|
BadBit = Bit bxor 1,
|
|
AltBin = <<PreBin:BitNumber/bitstring,
|
|
BadBit:1/integer,
|
|
PostBin/bitstring>>,
|
|
file:delete(TestFN),
|
|
{ok, Handle} = file:open(TestFN, ?WRITE_OPS),
|
|
ok = file:pwrite(Handle, 0, AltBin),
|
|
{ok, _} = file:position(Handle, bof),
|
|
case saferead_keyvalue(Handle) of
|
|
false ->
|
|
% Result OK to be false - should get that on error
|
|
ok;
|
|
{<<"Key">>, Value, KeyL, BadValueL} ->
|
|
% Sometimes corruption may yield a correct answer
|
|
% for example if Value Length is too big
|
|
%
|
|
% This can only happen with a corrupted value length at
|
|
% the end of the file - which is just a peculiarity of
|
|
% the test
|
|
?assertMatch(true, BadValueL > ValueL)
|
|
end,
|
|
ok = file:close(Handle)
|
|
end,
|
|
|
|
lists:foreach(TestCorruptedWriteFun,
|
|
lists:seq(1, -1 + 8 * (KeyL + ValueL + 8))),
|
|
|
|
{ok, HandleK} = file:open(TestFN, ?WRITE_OPS),
|
|
ok = file:pwrite(HandleK, 0, BinToWrite),
|
|
{ok, _} = file:position(HandleK, 8 + KeyL + ValueL),
|
|
?assertMatch(false, safe_read_next_key(HandleK, KeyL)),
|
|
ok = file:close(HandleK),
|
|
|
|
WrongKeyL = endian_flip(KeyL + ValueL),
|
|
{ok, HandleV0} = file:open(TestFN, ?WRITE_OPS),
|
|
ok = file:pwrite(HandleV0, 0, BinToWrite),
|
|
ok = file:pwrite(HandleV0, 0, <<WrongKeyL:32/integer>>),
|
|
{ok, _} = file:position(HandleV0, bof),
|
|
?assertMatch(false, saferead_keyvalue(HandleV0)),
|
|
ok = file:close(HandleV0),
|
|
|
|
WrongValL = 0,
|
|
{ok, HandleV1} = file:open(TestFN, ?WRITE_OPS),
|
|
ok = file:pwrite(HandleV1, 0, BinToWrite),
|
|
ok = file:pwrite(HandleV1, 4, <<WrongValL:32/integer>>),
|
|
{ok, _} = file:position(HandleV1, bof),
|
|
?assertMatch(false, saferead_keyvalue(HandleV1)),
|
|
ok = file:close(HandleV1),
|
|
|
|
io:format("Happy check ~n"),
|
|
{ok, HandleHappy} = file:open(TestFN, ?WRITE_OPS),
|
|
ok = file:pwrite(HandleHappy, 0, BinToWrite),
|
|
{ok, _} = file:position(HandleHappy, bof),
|
|
?assertMatch({<<"Key">>, Value, KeyL, ValueL},
|
|
saferead_keyvalue(HandleHappy)),
|
|
|
|
file:delete(TestFN).
|
|
|
|
|
|
get_positions_corruption_test() ->
|
|
F1 = "test/test_area/corruptpos_test.pnd",
|
|
file:delete(F1),
|
|
{ok, P1} = cdb_open_writer(F1, #cdb_options{binary_mode=false}),
|
|
KVList = generate_sequentialkeys(1000, []),
|
|
ok = cdb_mput(P1, KVList),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P1, "Key100")),
|
|
{ok, F2} = cdb_complete(P1),
|
|
{ok, P2} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
PositionList = cdb_getpositions(P2, all),
|
|
?assertMatch(1000, length(PositionList)),
|
|
ok = cdb_close(P2),
|
|
|
|
{ok, Handle} = file:open(F2, ?WRITE_OPS),
|
|
Positions = lists:sublist(PositionList, 200, 10),
|
|
CorruptFun =
|
|
fun(Offset) ->
|
|
ok = file:pwrite(Handle, Offset, <<0:8/integer>>)
|
|
end,
|
|
ok = lists:foreach(CorruptFun, Positions),
|
|
ok = file:close(Handle),
|
|
|
|
{ok, P3} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
|
|
PositionList = cdb_getpositions(P3, all),
|
|
?assertMatch(1000, length(PositionList)),
|
|
|
|
KVCL = cdb_directfetch(P3, PositionList, key_size),
|
|
?assertMatch(true, length(KVCL) < 1000),
|
|
ok = cdb_close(P3),
|
|
file:delete(F2).
|
|
|
|
badly_written_test() ->
|
|
F1 = "test/test_area/badfirstwrite_test.pnd",
|
|
file:delete(F1),
|
|
{ok, Handle} = file:open(F1, ?WRITE_OPS),
|
|
ok = file:pwrite(Handle, 256 * ?DWORD_SIZE, <<1:8/integer>>),
|
|
ok = file:close(Handle),
|
|
{ok, P1} = cdb_open_writer(F1, #cdb_options{binary_mode=false}),
|
|
ok = cdb_put(P1, "Key100", "Value100"),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P1, "Key100")),
|
|
ok = cdb_close(P1),
|
|
{ok, P2} = cdb_open_writer(F1, #cdb_options{binary_mode=false}),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P2, "Key100")),
|
|
ok = cdb_close(P2),
|
|
file:delete(F1).
|
|
|
|
pendingdelete_test() ->
|
|
F1 = "test/test_area/deletfile_test.pnd",
|
|
file:delete(F1),
|
|
{ok, P1} = cdb_open_writer(F1, #cdb_options{binary_mode=false}),
|
|
KVList = generate_sequentialkeys(1000, []),
|
|
ok = cdb_mput(P1, KVList),
|
|
?assertMatch(probably, cdb_keycheck(P1, "Key1")),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P1, "Key1")),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P1, "Key100")),
|
|
{ok, F2} = cdb_complete(P1),
|
|
{ok, P2} = cdb_open_reader(F2, #cdb_options{binary_mode=false}),
|
|
?assertMatch({"Key1", "Value1"}, cdb_get(P2, "Key1")),
|
|
?assertMatch({"Key100", "Value100"}, cdb_get(P2, "Key100")),
|
|
?SPECIAL_DELFUN(F2),
|
|
ok = cdb_deletepending(P2),
|
|
% No issues destroying even though the file has already been removed
|
|
ok = cdb_destroy(P2).
|
|
|
|
|
|
nonsense_coverage_test() ->
|
|
{ok, Pid} = gen_fsm:start_link(?MODULE, [#cdb_options{}], []),
|
|
ok = gen_fsm:send_all_state_event(Pid, nonsense),
|
|
?assertMatch({next_state, reader, #state{}}, handle_info(nonsense,
|
|
reader,
|
|
#state{})),
|
|
?assertMatch({ok, reader, #state{}}, code_change(nonsense,
|
|
reader,
|
|
#state{},
|
|
nonsense)).
|
|
|
|
-endif.
|