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%% Feel free to use, reuse and abuse the code in this file.
%% @doc EventSource emitter.
-module(eventsource_handler).
-export([init/2]).
-export([info/3]).
init(Req, Opts) ->
cowboy_req:stream_reply(200, #{
<<"content-type">> => <<"text/event-stream">>
}, Req),
erlang:send_after(1000, self(), {message, "Tick"}),
{cowboy_loop, Req, Opts, 5000}.
info({message, Msg}, Req, State) ->
cowboy_req:stream_body(["id: ", id(), "\ndata: ", Msg, "\n\n"], nofin, Req),
erlang:send_after(1000, self(), {message, "Tick"}),
{ok, Req, State}.
id() ->
integer_to_list(erlang:unique_integer([positive, monotonic]), 16).
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