rocksdb/thrift/lib/cpp/async/THttpAsyncChannel.h
Dhruba Borthakur 80c663882a Create leveldb server via Thrift.
Summary:
First draft.
Unit tests pass.

Test Plan: unit tests attached

Reviewers: heyongqiang

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D3969
2012-07-07 09:42:39 -07:00

205 lines
5.7 KiB
C++

/*
* 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.
*/
#ifndef THRIFT_ASYNC_THTTPASYNCCHANNEL_H_
#define THRIFT_ASYNC_THTTPASYNCCHANNEL_H_ 1
#include "thrift/lib/cpp/async/TStreamAsyncChannel.h"
#include "thrift/lib/cpp/util/THttpParser.h"
namespace apache { namespace thrift { namespace async {
class THttpAsyncChannel;
namespace detail {
/**
* Encapsulation of one outstanding write request on a THttpAsyncChannel.
*/
class THttpACWriteRequest :
public TAsyncChannelWriteRequestBase<THttpACWriteRequest> {
public:
typedef std::tr1::function<void()> VoidCallback;
THttpACWriteRequest(const VoidCallback& callback,
const VoidCallback& errorCallback,
transport::TMemoryBuffer* message,
TAsyncEventChannel* channel);
void write(TAsyncTransport* transport,
TAsyncTransport::WriteCallback* callback) THRIFT_NOEXCEPT;
void writeSuccess() THRIFT_NOEXCEPT;
void writeError(size_t bytesWritten,
const transport::TTransportException& ex) THRIFT_NOEXCEPT;
private:
char lengthBuf_[64];
THttpAsyncChannel* channel_;
};
/**
* Read state for THttpAsyncChannel
*/
class THttpACReadState {
public:
typedef std::tr1::function<void()> VoidCallback;
THttpACReadState() {
}
// Methods required by TStreamAsyncChannel
void setCallbackBuffer(transport::TMemoryBuffer* buffer) {
parser_->setDataBuffer(buffer);
}
void unsetCallbackBuffer() {
parser_->unsetDataBuffer();
}
bool hasReadAheadData() {
return parser_->hasReadAheadData();
}
bool hasPartialMessage() {
return parser_->hasPartialMessage();
}
void getReadBuffer(void** bufReturn, size_t* lenReturn);
bool readDataAvailable(size_t len);
// Other methods specific to THttpAsyncChannel
void setParser(boost::shared_ptr<apache::thrift::util::THttpParser> parser) {
parser_ = parser;
}
private:
boost::shared_ptr<apache::thrift::util::THttpParser> parser_;
};
} // namespace detail
/**
* THttpAsyncChannel
*
* This is a TAsyncChannel implementation that reads and writes messages
* encapuated in HTTP.
*
* Its messages are compatible with THttpTransport.
*/
class THttpAsyncChannel :
public TStreamAsyncChannel<detail::THttpACWriteRequest,
detail::THttpACReadState> {
private:
typedef TStreamAsyncChannel<detail::THttpACWriteRequest,
detail::THttpACReadState> Parent;
boost::shared_ptr<apache::thrift::util::THttpParser> parser_;
public:
explicit THttpAsyncChannel(
const boost::shared_ptr<TAsyncTransport>& transport)
: Parent(transport) {
}
/**
* Helper function to create a shared_ptr<THttpAsyncChannel>.
*
* This passes in the correct destructor object, since THttpAsyncChannel's
* destructor is protected and cannot be invoked directly.
*/
static boost::shared_ptr<THttpAsyncChannel> newChannel(
const boost::shared_ptr<TAsyncTransport>& transport) {
return boost::shared_ptr<THttpAsyncChannel>(
new THttpAsyncChannel(transport), Destructor());
}
/// size in bytes beyond which we'll reject a given http size.
void setMaxHttpSize(uint32_t size) {
parser_->setMaxSize(size);
}
uint32_t getMaxHttpSize() const {
return parser_->getMaxSize();
}
void setParser(boost::shared_ptr<apache::thrift::util::THttpParser> parser) {
parser_ = parser;
readState_.setParser(parser);
}
boost::shared_ptr<apache::thrift::util::THttpParser> getParser() const {
return parser_;
}
int constructHeader(iovec* ops,
int opsLen,
int contentLength,
char* contentLengthBuf) {
return parser_->constructHeader(ops,
opsLen,
contentLength,
contentLengthBuf);
}
protected:
/**
* Protected destructor.
*
* Users of THttpAsyncChannel must never delete it directly. Instead,
* invoke destroy().
*/
virtual ~THttpAsyncChannel() { }
};
class THttpAsyncChannelFactory : public TStreamAsyncChannelFactory {
public:
THttpAsyncChannelFactory()
: maxHttpSize_(0x7fffffff)
, recvTimeout_(0)
, sendTimeout_(0) {}
void setMaxHttpSize(uint32_t bytes) {
maxHttpSize_ = bytes;
}
void setRecvTimeout(uint32_t milliseconds) {
recvTimeout_ = milliseconds;
}
void setSendTimeout(uint32_t milliseconds) {
sendTimeout_ = milliseconds;
}
virtual boost::shared_ptr<TAsyncEventChannel> newChannel(
const boost::shared_ptr<TAsyncTransport>& transport) {
boost::shared_ptr<THttpAsyncChannel> channel(
THttpAsyncChannel::newChannel(transport));
transport->setSendTimeout(sendTimeout_);
channel->setMaxHttpSize(maxHttpSize_);
channel->setRecvTimeout(recvTimeout_);
return channel;
}
private:
uint32_t maxHttpSize_;
uint32_t recvTimeout_;
uint32_t sendTimeout_;
};
}}} // apache::thrift::async
#endif // THRIFT_ASYNC_THTTPASYNCCHANNEL_H_