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%%
%% Licensed to the Apache Software Foundation (ASF) under one
%% or more contributor license agreements. See the NOTICE file
%% distributed with this work for additional information
%% regarding copyright ownership. The ASF licenses this file
%% to you under the Apache License, Version 2.0 (the
%% "License"); you may not use this file except in compliance
%% with the License. You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%%
-module(thrift_file_transport).
-behaviour(thrift_transport).
%% constructors
-export([new/1, new/2]).
%% protocol callbacks
-export([read/2, read_exact/2, write/2, flush/1, close/1]).
%% legacy api
-export([new_reader/1]).
-record(t_file, {
device,
should_close = true,
mode = write
}).
-type state() :: #t_file{}.
-spec new(Device::file:io_device()) ->
thrift_transport:t_transport().
new(Device) -> new(Device, []).
-spec new(Device::file:io_device(), Opts::list()) ->
thrift_transport:t_transport().
%% Device should be opened in raw and binary mode.
new(Device, Opts) when is_list(Opts) ->
State = parse_opts(Opts, #t_file{device = Device}),
thrift_transport:new(?MODULE, State).
parse_opts([{should_close, Bool}|Rest], State)
when is_boolean(Bool) ->
parse_opts(Rest, State#t_file{should_close = Bool});
parse_opts([{mode, Mode}|Rest], State)
when Mode =:= write; Mode =:= read ->
parse_opts(Rest, State#t_file{mode = Mode});
parse_opts([], State) ->
State.
-include("thrift_transport_behaviour.hrl").
read(State = #t_file{device = Device, mode = read}, Len)
when is_integer(Len), Len >= 0 ->
case file:read(Device, Len) of
eof -> {State, {error, eof}};
{ok, Result} -> {State, {ok, iolist_to_binary(Result)}}
end;
read(State, _) ->
{State, {error, write_mode}}.
read_exact(State = #t_file{device = Device, mode = read}, Len)
when is_integer(Len), Len >= 0 ->
case file:read(Device, Len) of
eof -> {State, {error, eof}};
{ok, Result} ->
case iolist_size(Result) of
X when X < Len -> {State, {error, eof}};
_ -> {State, {ok, iolist_to_binary(Result)}}
end
end;
read_exact(State, _) ->
{State, {error, write_mode}}.
write(State = #t_file{device = Device, mode = write}, Data) ->
{State, file:write(Device, Data)};
write(State, _) ->
{State, {error, read_mode}}.
flush(State = #t_file{device = Device, mode = write}) ->
{State, file:sync(Device)}.
close(State = #t_file{device = Device, should_close = SC}) ->
case SC of
true -> {State, file:close(Device)};
false -> {State, ok}
end.
%% legacy api. left for compatibility
new_reader(Filename) ->
case file:open(Filename, [read, binary, {read_ahead, 1024*1024}]) of
{ok, IODevice} -> new(IODevice, [{should_close, true}, {mode, read}]);
Error -> Error
end.
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