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Diffstat (limited to '')
-rw-r--r-- | src/jaegertracing/thrift/lib/erl/src/thrift_file_transport.erl | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/jaegertracing/thrift/lib/erl/src/thrift_file_transport.erl b/src/jaegertracing/thrift/lib/erl/src/thrift_file_transport.erl new file mode 100644 index 000000000..071152b63 --- /dev/null +++ b/src/jaegertracing/thrift/lib/erl/src/thrift_file_transport.erl @@ -0,0 +1,115 @@ +%% +%% 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. + |