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rocksdb/thrift/lib/cpp/transport/TTransportUtils.h

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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.
*/
#ifndef _THRIFT_TRANSPORT_TTRANSPORTUTILS_H_
#define _THRIFT_TRANSPORT_TTRANSPORTUTILS_H_ 1
#include <cstdlib>
#include <cstring>
#include <string>
#include <algorithm>
#include "thrift/lib/cpp/transport/TTransport.h"
// Include the buffered transports that used to be defined here.
#include "thrift/lib/cpp/transport/TBufferTransports.h"
#include "thrift/lib/cpp/transport/TFileTransport.h"
namespace apache { namespace thrift { namespace transport {
/**
* The null transport is a dummy transport that doesn't actually do anything.
* It's sort of an analogy to /dev/null, you can never read anything from it
* and it will let you write anything you want to it, though it won't actually
* go anywhere.
*
*/
class TNullTransport : public TVirtualTransport<TNullTransport> {
public:
TNullTransport() {}
~TNullTransport() {}
bool isOpen() {
return true;
}
void open() {}
void write(const uint8_t* /* buf */, uint32_t /* len */) {
return;
}
};
/**
* TPipedTransport. This transport allows piping of a request from one
* transport to another either when readEnd() or writeEnd(). The typical
* use case for this is to log a request or a reply to disk.
* The underlying buffer expands to a keep a copy of the entire
* request/response.
*
*/
class TPipedTransport : virtual public TTransport {
public:
TPipedTransport(boost::shared_ptr<TTransport> srcTrans,
boost::shared_ptr<TTransport> dstTrans) :
srcTrans_(srcTrans),
dstTrans_(dstTrans),
rBufSize_(512), rPos_(0), rLen_(0),
wBufSize_(512), wLen_(0) {
// default is to to pipe the request when readEnd() is called
pipeOnRead_ = true;
pipeOnWrite_ = false;
rBuf_ = (uint8_t*) std::malloc(sizeof(uint8_t) * rBufSize_);
if (rBuf_ == NULL) {
throw std::bad_alloc();
}
wBuf_ = (uint8_t*) std::malloc(sizeof(uint8_t) * wBufSize_);
if (wBuf_ == NULL) {
throw std::bad_alloc();
}
}
TPipedTransport(boost::shared_ptr<TTransport> srcTrans,
boost::shared_ptr<TTransport> dstTrans,
uint32_t sz) :
srcTrans_(srcTrans),
dstTrans_(dstTrans),
rBufSize_(512), rPos_(0), rLen_(0),
wBufSize_(sz), wLen_(0) {
rBuf_ = (uint8_t*) std::malloc(sizeof(uint8_t) * rBufSize_);
if (rBuf_ == NULL) {
throw std::bad_alloc();
}
wBuf_ = (uint8_t*) std::malloc(sizeof(uint8_t) * wBufSize_);
if (wBuf_ == NULL) {
throw std::bad_alloc();
}
}
~TPipedTransport() {
std::free(rBuf_);
std::free(wBuf_);
}
bool isOpen() {
return srcTrans_->isOpen();
}
bool peek() {
if (rPos_ >= rLen_) {
// Double the size of the underlying buffer if it is full
if (rLen_ == rBufSize_) {
rBufSize_ *=2;
rBuf_ = (uint8_t *)std::realloc(rBuf_, sizeof(uint8_t) * rBufSize_);
}
// try to fill up the buffer
rLen_ += srcTrans_->read(rBuf_+rPos_, rBufSize_ - rPos_);
}
return (rLen_ > rPos_);
}
void open() {
srcTrans_->open();
}
void close() {
srcTrans_->close();
}
void setPipeOnRead(bool pipeVal) {
pipeOnRead_ = pipeVal;
}
void setPipeOnWrite(bool pipeVal) {
pipeOnWrite_ = pipeVal;
}
uint32_t read(uint8_t* buf, uint32_t len);
uint32_t readEnd() {
if (pipeOnRead_) {
dstTrans_->write(rBuf_, rPos_);
dstTrans_->flush();
}
srcTrans_->readEnd();
// If requests are being pipelined, copy down our read-ahead data,
// then reset our state.
int read_ahead = rLen_ - rPos_;
uint32_t bytes = rPos_;
memcpy(rBuf_, rBuf_ + rPos_, read_ahead);
rPos_ = 0;
rLen_ = read_ahead;
return bytes;
}
void write(const uint8_t* buf, uint32_t len);
uint32_t writeEnd() {
if (pipeOnWrite_) {
dstTrans_->write(wBuf_, wLen_);
dstTrans_->flush();
}
return wLen_;
}
void flush();
boost::shared_ptr<TTransport> getTargetTransport() {
return dstTrans_;
}
/*
* Override TTransport *_virt() functions to invoke our implementations.
* We cannot use TVirtualTransport to provide these, since we need to inherit
* virtually from TTransport.
*/
virtual uint32_t read_virt(uint8_t* buf, uint32_t len) {
return this->read(buf, len);
}
virtual void write_virt(const uint8_t* buf, uint32_t len) {
this->write(buf, len);
}
protected:
boost::shared_ptr<TTransport> srcTrans_;
boost::shared_ptr<TTransport> dstTrans_;
uint8_t* rBuf_;
uint32_t rBufSize_;
uint32_t rPos_;
uint32_t rLen_;
uint8_t* wBuf_;
uint32_t wBufSize_;
uint32_t wLen_;
bool pipeOnRead_;
bool pipeOnWrite_;
};
/**
* Wraps a transport into a pipedTransport instance.
*
*/
class TPipedTransportFactory : public TTransportFactory {
public:
TPipedTransportFactory() {}
TPipedTransportFactory(boost::shared_ptr<TTransport> dstTrans) {
initializeTargetTransport(dstTrans);
}
virtual ~TPipedTransportFactory() {}
/**
* Wraps the base transport into a piped transport.
*/
virtual boost::shared_ptr<TTransport> getTransport(boost::shared_ptr<TTransport> srcTrans) {
return boost::shared_ptr<TTransport>(new TPipedTransport(srcTrans, dstTrans_));
}
virtual void initializeTargetTransport(boost::shared_ptr<TTransport> dstTrans) {
if (dstTrans_.get() == NULL) {
dstTrans_ = dstTrans;
} else {
throw TLibraryException("Target transport already initialized");
}
}
protected:
boost::shared_ptr<TTransport> dstTrans_;
};
/**
* TPipedFileTransport. This is just like a TTransport, except that
* it is a templatized class, so that clients who rely on a specific
* TTransport can still access the original transport.
*
*/
class TPipedFileReaderTransport : public TPipedTransport,
public TFileReaderTransport {
public:
TPipedFileReaderTransport(boost::shared_ptr<TFileReaderTransport> srcTrans, boost::shared_ptr<TTransport> dstTrans);
~TPipedFileReaderTransport();
// TTransport functions
bool isOpen();
bool peek();
void open();
void close();
uint32_t read(uint8_t* buf, uint32_t len);
uint32_t readAll(uint8_t* buf, uint32_t len);
uint32_t readEnd();
void write(const uint8_t* buf, uint32_t len);
uint32_t writeEnd();
void flush();
// TFileReaderTransport functions
int32_t getReadTimeout();
void setReadTimeout(int32_t readTimeout);
uint32_t getNumChunks();
uint32_t getCurChunk();
void seekToChunk(int32_t chunk);
void seekToEnd();
/*
* Override TTransport *_virt() functions to invoke our implementations.
* We cannot use TVirtualTransport to provide these, since we need to inherit
* virtually from TTransport.
*/
virtual uint32_t read_virt(uint8_t* buf, uint32_t len) {
return this->read(buf, len);
}
virtual uint32_t readAll_virt(uint8_t* buf, uint32_t len) {
return this->readAll(buf, len);
}
virtual void write_virt(const uint8_t* buf, uint32_t len) {
this->write(buf, len);
}
protected:
// shouldn't be used
TPipedFileReaderTransport();
boost::shared_ptr<TFileReaderTransport> srcTrans_;
};
/**
* Creates a TPipedFileReaderTransport from a filepath and a destination transport
*
*/
class TPipedFileReaderTransportFactory : public TPipedTransportFactory {
public:
TPipedFileReaderTransportFactory() {}
TPipedFileReaderTransportFactory(boost::shared_ptr<TTransport> dstTrans)
: TPipedTransportFactory(dstTrans)
{}
virtual ~TPipedFileReaderTransportFactory() {}
boost::shared_ptr<TTransport> getTransport(boost::shared_ptr<TTransport> srcTrans) {
boost::shared_ptr<TFileReaderTransport> pFileReaderTransport = boost::dynamic_pointer_cast<TFileReaderTransport>(srcTrans);
if (pFileReaderTransport.get() != NULL) {
return getFileReaderTransport(pFileReaderTransport);
} else {
return boost::shared_ptr<TTransport>();
}
}
boost::shared_ptr<TFileReaderTransport> getFileReaderTransport(boost::shared_ptr<TFileReaderTransport> srcTrans) {
return boost::shared_ptr<TFileReaderTransport>(new TPipedFileReaderTransport(srcTrans, dstTrans_));
}
};
}}} // apache::thrift::transport
#endif // #ifndef _THRIFT_TRANSPORT_TTRANSPORTUTILS_H_