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103 行
3.4 KiB
103 行
3.4 KiB
-module(tpSocketCli).
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-behavior(gen_statem).
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-export([start_link/2]).
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-export([stop/1]).
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%% gen_statem.
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-export([callback_mode/0]).
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-export([init/1]).
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-export([connect/3]).
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-export([open_file/3]).
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-export([process_events/3]).
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-export([close_file/3]).
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-export([code_change/4]).
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-export([terminate/3]).
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-record(state, {
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port :: inet:port_number(),
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base_filename :: file:filename_all(),
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nth = 0 :: non_neg_integer(),
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socket :: inet:socket() | undefined,
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io_device :: file:io_device() | undefined,
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events_per_frame = 100000 :: pos_integer(),
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events_this_frame = 0 :: non_neg_integer(),
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buffer = <<>> :: binary()
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}).
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start_link(Port, BaseFilename) ->
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gen_statem:start_link(?MODULE, [Port, BaseFilename], []).
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stop(Pid) ->
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gen_statem:stop(Pid).
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callback_mode() ->
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state_functions.
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init([Port, BaseFilename]) ->
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%% Store all messages off the heap to avoid unnecessary GC.
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process_flag(message_queue_data, off_heap),
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%% We need to trap exit signals in order to shutdown properly.
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process_flag(trap_exit, true),
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{ok, connect, #state{port = Port, base_filename = BaseFilename},
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{next_event, internal, run}}.
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connect(internal, _, State) ->
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do_connect(State);
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connect({timeout, retry}, retry, State) ->
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do_connect(State);
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connect(_, _, State) ->
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{keep_state, State}.
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do_connect(State = #state{port = Port}) ->
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case gen_tcp:connect("localhost", Port, [binary, {packet, 2}, {active, true}]) of
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{ok, Socket} ->
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{next_state, open_file, State#state{socket = Socket},
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{next_event, internal, run}};
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{error, _} ->
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{keep_state, State, [{{timeout, retry}, 1000, retry}]}
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end.
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open_file(internal, _, State = #state{base_filename = Filename0, nth = Nth}) ->
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Filename = filename:flatten([Filename0, ".", integer_to_list(Nth)]),
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{ok, IoDevice} = file:open(Filename, [write, raw]),
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{next_state, process_events, State#state{nth = Nth + 1, io_device = IoDevice}}.
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process_events(info, {tcp, Socket, Bin}, State = #state{socket = Socket, io_device = IoDevice,
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events_per_frame = MaxEvents, events_this_frame = NumEvents0, buffer = Buffer0}) ->
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BinSize = byte_size(Bin),
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Buffer = <<Buffer0/binary, BinSize:16, Bin/binary>>,
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NumEvents = NumEvents0 + 1,
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if
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MaxEvents =:= NumEvents ->
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ok = file:write(IoDevice, zip:compress_frame(Buffer)),
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{keep_state, State#state{events_this_frame = 0, buffer = <<>>}};
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true ->
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{keep_state, State#state{events_this_frame = NumEvents, buffer = Buffer}}
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end;
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process_events(info, {tcp_closed, Socket}, State = #state{socket = Socket}) ->
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{next_state, close_file, State#state{socket = undefined},
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{next_event, internal, run}};
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process_events(info, {tcp_error, Socket, _}, State = #state{socket = Socket}) ->
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_ = gen_tcp:close(Socket),
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{next_state, close_file, State#state{socket = undefined},
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{next_event, internal, run}}.
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close_file(internal, _, State) ->
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do_close_file(State),
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{next_state, connect, State#state{io_device = undefined},
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{next_event, internal, run}}.
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do_close_file(#state{io_device = IoDevice, buffer = Buffer}) ->
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_ = file:write(IoDevice, lz4f:compress_frame(Buffer)),
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_ = file:close(IoDevice),
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ok.
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code_change(_OldVsn, OldState, OldData, _Extra) ->
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{callback_mode(), OldState, OldData}.
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terminate(_, _, #state{io_device = undefined}) ->
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ok;
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terminate(_, _, State) ->
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do_close_file(State),
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ok.
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