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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_transport).
-export([behaviour_info/1]).
%% constructors
-export([new/1, new/2]).
%% transport callbacks
-export([read/2, read_exact/2, write/2, flush/1, close/1]).
-export_type([t_transport/0]).
behaviour_info(callbacks) ->
[{read, 2}, {write, 2}, {flush, 1}, {close, 1}].
-record(t_transport, {
module,
state
}).
-type state() :: #t_transport{}.
-type t_transport() :: #t_transport{}.
-ifdef(transport_wrapper_module).
-define(debug_wrap(Transport),
case Transport#t_transport.module of
?transport_wrapper_module -> Transport;
_Else ->
{ok, Result} = ?transport_wrapper_module:new(Transport),
Result
end
).
-else.
-define(debug_wrap(Transport), Transport).
-endif.
-type wrappable() ::
binary() |
list() |
{membuffer, binary() | list()} |
{tcp, port()} |
{tcp, port(), list()} |
{file, file:io_device()} |
{file, file:io_device(), list()} |
{file, file:filename()} |
{file, file:filename(), list()}.
-spec new(wrappable()) -> {ok, #t_transport{}}.
new({membuffer, Membuffer}) when is_binary(Membuffer); is_list(Membuffer) ->
thrift_membuffer_transport:new(Membuffer);
new({membuffer, Membuffer, []}) when is_binary(Membuffer); is_list(Membuffer) ->
thrift_membuffer_transport:new(Membuffer);
new({tcp, Socket}) when is_port(Socket) ->
new({tcp, Socket, []});
new({tcp, Socket, Opts}) when is_port(Socket) ->
thrift_socket_transport:new(Socket, Opts);
new({file, Filename}) when is_list(Filename); is_binary(Filename) ->
new({file, Filename, []});
new({file, Filename, Opts}) when is_list(Filename); is_binary(Filename) ->
{ok, File} = file:open(Filename, [raw, binary]),
new({file, File, Opts});
new({file, File, Opts}) ->
thrift_file_transport:new(File, Opts).
-spec new(Module::module(), State::any()) -> {ok, #t_transport{}}.
new(Module, State) when is_atom(Module) ->
{ok, ?debug_wrap(#t_transport{module = Module, state = State})}.
-include("thrift_transport_behaviour.hrl").
read(Transport = #t_transport{module = Module}, Len)
when is_integer(Len), Len >= 0 ->
{NewState, Result} = Module:read(Transport#t_transport.state, Len),
{Transport#t_transport{state = NewState}, Result}.
read_exact(Transport = #t_transport{module = Module}, Len)
when is_integer(Len), Len >= 0 ->
case lists:keyfind(read_exact, 1, Module:module_info(exports)) of
{read_exact, 2} ->
{NewState, Result} = Module:read_exact(Transport#t_transport.state, Len),
{Transport#t_transport{state = NewState}, Result};
_ ->
read(Transport, Len)
end.
write(Transport = #t_transport{module = Module}, Data) ->
{NewState, Result} = Module:write(Transport#t_transport.state, Data),
{Transport#t_transport{state = NewState}, Result}.
flush(Transport = #t_transport{module = Module}) ->
{NewState, Result} = Module:flush(Transport#t_transport.state),
{Transport#t_transport{state = NewState}, Result}.
close(Transport = #t_transport{module = Module}) ->
{NewState, Result} = Module:close(Transport#t_transport.state),
{Transport#t_transport{state = NewState}, Result}.
|
