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8404b1c908
This feature is currently experimental. It will become the preferred way to use Websocket handlers once it becomes documented. A commands-based interface enables adding commands without having to change the interface much. It mirrors the interface of stream handlers or gen_statem. It will enable adding commands that have been needed for some time but were not implemented for fear of making the interface too complex.
32 lines
888 B
Erlang
32 lines
888 B
Erlang
%% This module takes commands from the x-commands header
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%% and returns them in the websocket_info/2 callback.
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%% This callback is triggered via a message.
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-module(ws_info_commands_h).
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-behavior(cowboy_websocket).
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-export([init/2]).
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-export([websocket_init/1]).
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-export([websocket_handle/2]).
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-export([websocket_info/2]).
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init(Req=#{pid := Pid}, RunOrHibernate) ->
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Commands0 = cowboy_req:header(<<"x-commands">>, Req),
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Commands = binary_to_term(base64:decode(Commands0)),
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case Commands of
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bad -> ct_helper_error_h:ignore(Pid, cowboy_websocket, handler_call, 6);
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_ -> ok
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end,
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{cowboy_websocket, Req, {Commands, RunOrHibernate}}.
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websocket_init(State) ->
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self() ! shoot,
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{[], State}.
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websocket_handle(_, State) ->
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{[], State}.
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websocket_info(_, State={Commands, run}) ->
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{Commands, State};
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websocket_info(_, State={Commands, hibernate}) ->
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{Commands, State, hibernate}.
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