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rocksdb/thrift/lib/cpp/transport/TFileTransport.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_TFILETRANSPORT_H_
#define _THRIFT_TRANSPORT_TFILETRANSPORT_H_ 1
#include "thrift/lib/cpp/transport/TTransport.h"
#include "thrift/lib/cpp/Thrift.h"
#include "thrift/lib/cpp/TProcessor.h"
#include <string>
#include <stdio.h>
#include <pthread.h>
#include <boost/scoped_ptr.hpp>
#include <boost/shared_ptr.hpp>
namespace apache { namespace thrift { namespace transport {
using apache::thrift::TProcessor;
using apache::thrift::protocol::TProtocolFactory;
// Data pertaining to a single event
typedef struct eventInfo {
uint8_t* eventBuff_;
uint32_t eventSize_;
uint32_t eventBuffPos_;
eventInfo():eventBuff_(NULL), eventSize_(0), eventBuffPos_(0){};
~eventInfo() {
if (eventBuff_) {
delete[] eventBuff_;
}
}
} eventInfo;
// information about current read state
typedef struct readState {
eventInfo* event_;
// keep track of event size
uint8_t eventSizeBuff_[4];
uint8_t eventSizeBuffPos_;
bool readingSize_;
// read buffer variables
int32_t bufferPtr_;
int32_t bufferLen_;
// last successful dispatch point
int32_t lastDispatchPtr_;
void resetState(uint32_t lastDispatchPtr) {
readingSize_ = true;
eventSizeBuffPos_ = 0;
lastDispatchPtr_ = lastDispatchPtr;
}
void resetAllValues() {
resetState(0);
bufferPtr_ = 0;
bufferLen_ = 0;
if (event_) {
delete(event_);
}
event_ = 0;
}
readState() {
event_ = 0;
resetAllValues();
}
~readState() {
if (event_) {
delete(event_);
}
}
} readState;
/**
* TFileTransportBuffer - buffer class used by TFileTransport for queuing up events
* to be written to disk. Should be used in the following way:
* 1) Buffer created
* 2) Buffer written to (addEvent)
* 3) Buffer read from (getNext)
* 4) Buffer reset (reset)
* 5) Go back to 2, or destroy buffer
*
* The buffer should never be written to after it is read from, unless it is reset first.
* Note: The above rules are enforced mainly for debugging its sole client TFileTransport
* which uses the buffer in this way.
*
*/
class TFileTransportBuffer {
public:
TFileTransportBuffer(uint32_t size);
~TFileTransportBuffer();
bool addEvent(eventInfo *event);
eventInfo* getNext();
void reset();
bool isFull();
bool isEmpty();
private:
TFileTransportBuffer(); // should not be used
enum mode {
WRITE,
READ
};
mode bufferMode_;
uint32_t writePoint_;
uint32_t readPoint_;
uint32_t size_;
eventInfo** buffer_;
};
/**
* Abstract interface for transports used to read files
*/
class TFileReaderTransport : virtual public TTransport {
public:
virtual int32_t getReadTimeout() = 0;
virtual void setReadTimeout(int32_t readTimeout) = 0;
virtual uint32_t getNumChunks() = 0;
virtual uint32_t getCurChunk() = 0;
virtual void seekToChunk(int32_t chunk) = 0;
virtual void seekToEnd() = 0;
};
/**
* Abstract interface for transports used to write files
*/
class TFileWriterTransport : virtual public TTransport {
public:
virtual uint32_t getChunkSize() = 0;
virtual void setChunkSize(uint32_t chunkSize) = 0;
};
/**
* File implementation of a transport. Reads and writes are done to a
* file on disk.
*
*/
class TFileTransport : public TFileReaderTransport,
public TFileWriterTransport {
public:
TFileTransport(std::string path, bool readOnly=false);
~TFileTransport();
// TODO: what is the correct behavior for this?
// the log file is generally always open
bool isOpen() {
return true;
}
void write(const uint8_t* buf, uint32_t len);
void flush();
uint32_t readAll(uint8_t* buf, uint32_t len);
bool peek();
uint32_t read(uint8_t* buf, uint32_t len);
// log-file specific functions
void seekToChunk(int32_t chunk);
void seekToEnd();
uint32_t getNumChunks();
uint32_t getCurChunk();
// for changing the output file
void resetOutputFile(int fd, std::string filename, int64_t offset);
// Setter/Getter functions for user-controllable options
void setReadBuffSize(uint32_t readBuffSize) {
if (readBuffSize) {
readBuffSize_ = readBuffSize;
}
}
uint32_t getReadBuffSize() {
return readBuffSize_;
}
static const int32_t TAIL_READ_TIMEOUT = -1;
static const int32_t NO_TAIL_READ_TIMEOUT = 0;
void setReadTimeout(int32_t readTimeout) {
readTimeout_ = readTimeout;
}
int32_t getReadTimeout() {
return readTimeout_;
}
void setChunkSize(uint32_t chunkSize) {
if (chunkSize) {
chunkSize_ = chunkSize;
}
}
uint32_t getChunkSize() {
return chunkSize_;
}
void setEventBufferSize(uint32_t bufferSize) {
if (bufferAndThreadInitialized_) {
GlobalOutput("Cannot change the buffer size after writer thread started");
return;
}
eventBufferSize_ = bufferSize;
}
uint32_t getEventBufferSize() {
return eventBufferSize_;
}
void setFlushMaxUs(uint32_t flushMaxUs) {
if (flushMaxUs) {
flushMaxUs_ = flushMaxUs;
}
}
uint32_t getFlushMaxUs() {
return flushMaxUs_;
}
void setFlushMaxBytes(uint32_t flushMaxBytes) {
if (flushMaxBytes) {
flushMaxBytes_ = flushMaxBytes;
}
}
uint32_t getFlushMaxBytes() {
return flushMaxBytes_;
}
void setMaxEventSize(uint32_t maxEventSize) {
maxEventSize_ = maxEventSize;
}
uint32_t getMaxEventSize() {
return maxEventSize_;
}
void setMaxCorruptedEvents(uint32_t maxCorruptedEvents) {
maxCorruptedEvents_ = maxCorruptedEvents;
}
uint32_t getMaxCorruptedEvents() {
return maxCorruptedEvents_;
}
void setEofSleepTimeUs(uint32_t eofSleepTime) {
if (eofSleepTime) {
eofSleepTime_ = eofSleepTime;
}
}
uint32_t getEofSleepTimeUs() {
return eofSleepTime_;
}
/*
* 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);
}
private:
// helper functions for writing to a file
void enqueueEvent(const uint8_t* buf, uint32_t eventLen);
bool swapEventBuffers(struct timespec* deadline);
bool initBufferAndWriteThread();
// control for writer thread
static void* startWriterThread(void* ptr) {
(((TFileTransport*)ptr)->writerThread());
return 0;
}
void writerThread();
// helper functions for reading from a file
eventInfo* readEvent();
// event corruption-related functions
bool isEventCorrupted();
void performRecovery();
// Utility functions
void openLogFile();
void getNextFlushTime(struct timespec* ts_next_flush);
// Class variables
readState readState_;
uint8_t* readBuff_;
eventInfo* currentEvent_;
uint32_t readBuffSize_;
static const uint32_t DEFAULT_READ_BUFF_SIZE = 1 * 1024 * 1024;
int32_t readTimeout_;
static const int32_t DEFAULT_READ_TIMEOUT_MS = 200;
// size of chunks that file will be split up into
uint32_t chunkSize_;
static const uint32_t DEFAULT_CHUNK_SIZE = 16 * 1024 * 1024;
// size of event buffers
uint32_t eventBufferSize_;
static const uint32_t DEFAULT_EVENT_BUFFER_SIZE = 10000;
// max number of microseconds that can pass without flushing
uint32_t flushMaxUs_;
static const uint32_t DEFAULT_FLUSH_MAX_US = 3000000;
// max number of bytes that can be written without flushing
uint32_t flushMaxBytes_;
static const uint32_t DEFAULT_FLUSH_MAX_BYTES = 1000 * 1024;
// max event size
uint32_t maxEventSize_;
static const uint32_t DEFAULT_MAX_EVENT_SIZE = 0;
// max number of corrupted events per chunk
uint32_t maxCorruptedEvents_;
static const uint32_t DEFAULT_MAX_CORRUPTED_EVENTS = 0;
// sleep duration when EOF is hit
uint32_t eofSleepTime_;
static const uint32_t DEFAULT_EOF_SLEEP_TIME_US = 500 * 1000;
// sleep duration when a corrupted event is encountered
uint32_t corruptedEventSleepTime_;
static const uint32_t DEFAULT_CORRUPTED_SLEEP_TIME_US = 1 * 1000 * 1000;
// sleep duration in seconds when an IO error is encountered in the writer thread
uint32_t writerThreadIOErrorSleepTime_;
static const uint32_t DEFAULT_WRITER_THREAD_SLEEP_TIME_US = 60 * 1000 * 1000;
// writer thread id
pthread_t writerThreadId_;
// buffers to hold data before it is flushed. Each element of the buffer stores a msg that
// needs to be written to the file. The buffers are swapped by the writer thread.
TFileTransportBuffer *dequeueBuffer_;
TFileTransportBuffer *enqueueBuffer_;
// conditions used to block when the buffer is full or empty
pthread_cond_t notFull_, notEmpty_;
volatile bool closing_;
// To keep track of whether the buffer has been flushed
pthread_cond_t flushed_;
bool forceFlush_;
// Mutex that is grabbed when enqueuing and swapping the read/write buffers
pthread_mutex_t mutex_;
// File information
std::string filename_;
int fd_;
// Whether the writer thread and buffers have been initialized
bool bufferAndThreadInitialized_;
// Offset within the file
off_t offset_;
// event corruption information
uint32_t lastBadChunk_;
uint32_t numCorruptedEventsInChunk_;
bool readOnly_;
};
// Exception thrown when EOF is hit
class TEOFException : public TTransportException {
public:
TEOFException():
TTransportException(TTransportException::END_OF_FILE) {};
};
// wrapper class to process events from a file containing thrift events
class TFileProcessor {
public:
/**
* Constructor that defaults output transport to null transport
*
* @param processor processes log-file events
* @param protocolFactory protocol factory
* @param inputTransport file transport
*/
TFileProcessor(boost::shared_ptr<TProcessor> processor,
boost::shared_ptr<TProtocolFactory> protocolFactory,
boost::shared_ptr<TFileReaderTransport> inputTransport);
TFileProcessor(boost::shared_ptr<TProcessor> processor,
boost::shared_ptr<TProtocolFactory> inputProtocolFactory,
boost::shared_ptr<TProtocolFactory> outputProtocolFactory,
boost::shared_ptr<TFileReaderTransport> inputTransport);
/**
* Constructor
*
* @param processor processes log-file events
* @param protocolFactory protocol factory
* @param inputTransport input file transport
* @param output output transport
*/
TFileProcessor(boost::shared_ptr<TProcessor> processor,
boost::shared_ptr<TProtocolFactory> protocolFactory,
boost::shared_ptr<TFileReaderTransport> inputTransport,
boost::shared_ptr<TTransport> outputTransport);
/**
* processes events from the file
*
* @param numEvents number of events to process (0 for unlimited)
* @param tail tails the file if true
*/
void process(uint32_t numEvents, bool tail);
/**
* process events until the end of the chunk
*
*/
void processChunk();
private:
boost::shared_ptr<TProcessor> processor_;
boost::shared_ptr<TProtocolFactory> inputProtocolFactory_;
boost::shared_ptr<TProtocolFactory> outputProtocolFactory_;
boost::shared_ptr<TFileReaderTransport> inputTransport_;
boost::shared_ptr<TTransport> outputTransport_;
};
}}} // apache::thrift::transport
#endif // _THRIFT_TRANSPORT_TFILETRANSPORT_H_