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TEvhttpClientChannel.cpp
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TEvhttpClientChannel.cpp
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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.
*/
#include <thrift/async/TEvhttpClientChannel.h>
#include <evhttp.h>
#include <event2/buffer.h>
#include <event2/buffer_compat.h>
#include <thrift/transport/TBufferTransports.h>
#include <thrift/protocol/TProtocolException.h>
#include <iostream>
#include <sstream>
using namespace apache::thrift::protocol;
using apache::thrift::transport::TTransportException;
namespace apache {
namespace thrift {
namespace async {
TEvhttpClientChannel::TEvhttpClientChannel(const std::string& host,
const std::string& path,
const char* address,
int port,
struct event_base* eb,
struct evdns_base* dnsbase)
: host_(host), path_(path), conn_(nullptr) {
conn_ = evhttp_connection_base_new(eb, dnsbase, address, port);
if (conn_ == nullptr) {
throw TException("evhttp_connection_new failed");
}
}
TEvhttpClientChannel::~TEvhttpClientChannel() {
if (conn_ != nullptr) {
evhttp_connection_free(conn_);
}
}
void TEvhttpClientChannel::sendAndRecvMessage(const VoidCallback& cob,
apache::thrift::transport::TMemoryBuffer* sendBuf,
apache::thrift::transport::TMemoryBuffer* recvBuf) {
struct evhttp_request* req = evhttp_request_new(response, this);
if (req == nullptr) {
throw TException("evhttp_request_new failed");
}
int rv;
rv = evhttp_add_header(req->output_headers, "Host", host_.c_str());
if (rv != 0) {
throw TException("evhttp_add_header failed");
}
rv = evhttp_add_header(req->output_headers, "Content-Type", "application/x-thrift");
if (rv != 0) {
throw TException("evhttp_add_header failed");
}
uint8_t* obuf;
uint32_t sz;
sendBuf->getBuffer(&obuf, &sz);
rv = evbuffer_add(req->output_buffer, obuf, sz);
if (rv != 0) {
throw TException("evbuffer_add failed");
}
rv = evhttp_make_request(conn_, req, EVHTTP_REQ_POST, path_.c_str());
if (rv != 0) {
throw TException("evhttp_make_request failed");
}
completionQueue_.push(Completion(cob, recvBuf));
}
void TEvhttpClientChannel::sendMessage(const VoidCallback& cob,
apache::thrift::transport::TMemoryBuffer* message) {
(void)cob;
(void)message;
throw TProtocolException(TProtocolException::NOT_IMPLEMENTED,
"Unexpected call to TEvhttpClientChannel::sendMessage");
}
void TEvhttpClientChannel::recvMessage(const VoidCallback& cob,
apache::thrift::transport::TMemoryBuffer* message) {
(void)cob;
(void)message;
throw TProtocolException(TProtocolException::NOT_IMPLEMENTED,
"Unexpected call to TEvhttpClientChannel::recvMessage");
}
void TEvhttpClientChannel::finish(struct evhttp_request* req) {
assert(!completionQueue_.empty());
Completion completion = completionQueue_.front();
completionQueue_.pop();
if (req == nullptr) {
try {
completion.first();
} catch (const TTransportException& e) {
if (e.getType() == TTransportException::END_OF_FILE)
throw TException("connect failed");
else
throw;
}
return;
} else if (req->response_code != 200) {
try {
completion.first();
} catch (const TTransportException& e) {
std::stringstream ss;
ss << "server returned code " << req->response_code;
if (req->response_code_line)
ss << ": " << req->response_code_line;
if (e.getType() == TTransportException::END_OF_FILE)
throw TException(ss.str());
else
throw;
}
return;
}
completion.second->resetBuffer(EVBUFFER_DATA(req->input_buffer),
static_cast<uint32_t>(EVBUFFER_LENGTH(req->input_buffer)));
completion.first();
return;
}
/* static */ void TEvhttpClientChannel::response(struct evhttp_request* req, void* arg) {
auto* self = (TEvhttpClientChannel*)arg;
try {
self->finish(req);
} catch (std::exception& e) {
// don't propagate a C++ exception in C code (e.g. libevent)
std::cerr << "TEvhttpClientChannel::response exception thrown (ignored): " << e.what()
<< std::endl;
}
}
}
}
} // apache::thrift::async