| %% |
| %% 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. |
| |