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27 lines
782 B
Erlang
27 lines
782 B
Erlang
%% 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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-export([init/2]).
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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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{cowboy_loop, Req, 2, hibernate}.
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info(timeout, Req, 0) ->
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%% Send an unused status code to make sure there's no
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%% conflict with whatever Cowboy may send itself.
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{stop, cowboy_req:reply(<<"299 OK!">>, Req), 0};
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info(timeout, Req, Count) ->
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erlang:send_after(200, self(), timeout),
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{ok, Req, Count - 1, hibernate}.
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terminate(stop, _, 0) ->
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ok;
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terminate({error, overflow}, _, _) ->
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ok.
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