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28 lines
735 B
Erlang
28 lines
735 B
Erlang
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%% This module implements a loop handler for long-polling.
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%% It starts by sending itself a message after 200ms,
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%% then sends another after that for a total of 3 messages.
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%% When it receives the last message, it sends a 102 reply back.
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-module(long_polling_h).
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-behaviour(cowboy_loop_handler).
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-export([init/3]).
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-export([info/3]).
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-export([terminate/3]).
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init(_, Req, _) ->
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erlang:send_after(200, self(), timeout),
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{loop, Req, 2, 5000, hibernate}.
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info(timeout, Req, 0) ->
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{ok, Req2} = cowboy_req:reply(102, Req),
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{ok, Req2, 0};
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info(timeout, Req, Count) ->
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erlang:send_after(200, self(), timeout),
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{loop, Req, Count - 1, hibernate}.
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terminate({normal, shutdown}, _, 0) ->
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ok;
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terminate({error, overflow}, _, _) ->
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ok.
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