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They allow the server to configure what it is willing to accept for both the negotiated configuration (takeover and window bits) and the other zlib options (level, mem_level and strategy). This can be used to reduce the memory and/or CPU footprint of the compressed data, which comes with a cost in compression ratio.
36 lines
1.1 KiB
Erlang
36 lines
1.1 KiB
Erlang
%% This module enables compression and returns deflate
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%% options depending on the query string.
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-module(ws_deflate_opts_h).
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-behavior(cowboy_websocket).
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-export([init/2]).
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-export([websocket_handle/2]).
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-export([websocket_info/2]).
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init(Req=#{qs := Qs}, State) ->
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{Name, Value} = case Qs of
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<<"server_context_takeover">> -> {server_context_takeover, takeover};
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<<"server_no_context_takeover">> -> {server_context_takeover, no_takeover};
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<<"client_context_takeover">> -> {client_context_takeover, takeover};
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<<"client_no_context_takeover">> -> {client_context_takeover, no_takeover};
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<<"server_max_window_bits">> -> {server_max_window_bits, 9};
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<<"client_max_window_bits">> -> {client_max_window_bits, 9};
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<<"level">> -> {level, best_speed};
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<<"mem_level">> -> {mem_level, 1};
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<<"strategy">> -> {strategy, rle}
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end,
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{cowboy_websocket, Req, State, #{
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compress => true,
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deflate_opts => #{Name => Value}
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}}.
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websocket_handle({text, Data}, State) ->
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{reply, {text, Data}, State};
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websocket_handle({binary, Data}, State) ->
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{reply, {binary, Data}, State};
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websocket_handle(_, State) ->
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{ok, State}.
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websocket_info(_, State) ->
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{ok, State}.
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