Exemple #1
0
// Get remote hashed intervals
func netDstReceiver(decoder *gob.Decoder, netInStream chan<- HashedInterval, netInStreamDone chan<- bool) {
	status := true
	for {
		if verboseClient {
			log.Debug("Client.netDstReceiver decoding...")
		}
		var r HashedInterval
		err := decoder.Decode(&r)
		if err != nil {
			log.Fatal("Cient protocol error:", err)
			status = false
			break
		}
		// interval := r.Interval
		if r.Kind == SparseIgnore {
			if verboseClient {
				log.Debug("Client.netDstReceiver got <eof>")
			}
			break
		}
		if verboseClient {
			switch r.Kind {
			case SparseData:
				log.Debug("Client.netDstReceiver got data", r.FileInterval, "hash[", len(r.Hash), "]")
			case SparseHole:
				log.Debug("Client.netDstReceiver got hole", r.FileInterval)
			}
		}
		netInStream <- r
	}
	close(netInStream)
	netInStreamDone <- status
}
Exemple #2
0
func netSender(netOutStream <-chan HashedInterval, encoder *gob.Encoder, netOutDoneStream chan<- bool) {
	for r := range netOutStream {
		if verboseServer {
			log.Debug("Server.netSender: sending", r.FileInterval)
		}
		err := encoder.Encode(r)
		if err != nil {
			log.Fatal("Protocol encoder error:", err)
			netOutDoneStream <- false
			return
		}
	}

	rEOF := HashedInterval{FileInterval{SparseIgnore, Interval{}}, make([]byte, 0)}
	if rEOF.Len() != 0 {
		log.Fatal("Server.netSender internal error")
	}
	// err := encoder.Encode(HashedInterval{FileInterval{}, make([]byte, 0)})
	err := encoder.Encode(rEOF)
	if err != nil {
		log.Fatal("Protocol encoder error:", err)
		netOutDoneStream <- false
		return
	}
	if verboseServer {
		log.Debug("Server.netSender: finished sending hashes")
	}
	netOutDoneStream <- true
}
Exemple #3
0
// IntervalSplitter limits file intervals to predefined batch size
func IntervalSplitter(spltterStream <-chan FileInterval, fileStream chan<- FileInterval) {
	const batch = 32 * Blocks
	for r := range spltterStream {
		if verboseServer {
			log.Debug("Interval Splitter:", r)
		}
		switch r.Kind {
		case SparseHole:
			// Process hole
			fileStream <- r
		case SparseData:
			// Process data in chunks
			for offset := r.Begin; offset < r.End; {
				size := batch
				if offset+size > r.End {
					size = r.End - offset
				}
				interval := Interval{offset, offset + size}
				if size == batch && interval.End%batch != 0 {
					interval.End = interval.End / batch * batch
				}
				log.Debug("Interval Splitter data:", interval)
				fileStream <- FileInterval{SparseData, interval}
				offset += interval.Len()
			}
		}
	}
	close(fileStream)
}
Exemple #4
0
// OrderIntervals puts back "out of order" read results
func OrderIntervals(prefix string, unorderedStream <-chan HashedDataInterval, orderedStream chan<- HashedDataInterval) {
	pos := int64(0)
	m := make(map[int64]HashedDataInterval) // out of order completions
	for r := range unorderedStream {
		if pos == r.Begin {
			// Handle "in order" range
			log.Debug(prefix, r)
			orderedStream <- r
			pos = r.End
		} else {
			// push "out of order"" range
			m[r.Begin] = r
		}

		// check the "out of order" stash for "in order"
		for pop, existsNext := m[pos]; len(m) > 0 && existsNext; pop, existsNext = m[pos] {
			// pop in order range
			log.Debug(prefix, pop)
			orderedStream <- pop
			delete(m, pos)
			pos = pop.End
		}
	}
	close(orderedStream)
}
Exemple #5
0
// FileWriter supports concurrent file reading
// add this writer to wgroup before invoking
func FileWriter(fileStream <-chan DataInterval, path string, wgroup *sync.WaitGroup) {
	// open file
	file, err := fileOpen(path, os.O_WRONLY, 0)
	if err != nil {
		log.Fatal("Failed to open file for wroting:", string(path), err)
	}
	defer file.Close()

	for r := range fileStream {
		switch r.Kind {
		case SparseHole:
			log.Debug("trimming...")
			err := PunchHole(file, r.Interval)
			if err != nil {
				log.Fatal("Failed to trim file")
			}

		case SparseData:
			log.Debug("writing data...")
			_, err = fileWriteAt(file, r.Data, r.Begin)
			if err != nil {
				log.Fatal("Failed to write file")
			}
		}
	}
	wgroup.Done()
}
Exemple #6
0
func logData(prefix string, data []byte) {
	size := len(data)
	if size > 0 {
		log.Debug("\t", prefix, "of", size, "bytes", data[0], "...")
	} else {
		log.Debug("\t", prefix, "of", size, "bytes")
	}
}
Exemple #7
0
func netReceiver(decoder *gob.Decoder, file *os.File, netInStream chan<- DataInterval, fileStream chan<- DataInterval, deltaReceiverDone chan<- bool) {
	// receive & process data diff
	status := true
	for status {
		var delta FileInterval
		err := decoder.Decode(&delta)
		if err != nil {
			log.Fatal("Protocol decoder error:", err)
			status = false
			break
		}
		log.Debug("receiving delta [", delta, "]")
		if 0 == delta.Len() {
			log.Debug("received end of transimission marker")
			break // end of diff
		}
		switch delta.Kind {
		case SparseData:
			// Receive data
			var data []byte
			err = decoder.Decode(&data)
			if err != nil {
				log.Fatal("Protocol data decoder error:", err)
				status = false
				break
			}
			if int64(len(data)) != delta.Len() {
				log.Fatal("Failed to receive data, expected=", delta.Len(), "received=", len(data))
				status = false
				break
			}
			// Push for writing and vaildator processing
			fileStream <- DataInterval{delta, data}
			netInStream <- DataInterval{delta, data}

		case SparseHole:
			// Push for writing and vaildator processing
			fileStream <- DataInterval{delta, make([]byte, 0)}
			netInStream <- DataInterval{delta, make([]byte, 0)}

		case SparseIgnore:
			// Push for vaildator processing
			netInStream <- DataInterval{delta, make([]byte, 0)}
			log.Debug("ignoring...")
		}
	}

	log.Debug("Server.netReceiver done, sync")
	close(netInStream)
	close(fileStream)
	deltaReceiverDone <- status
}
Exemple #8
0
// RetrieveLayoutStream streams sparse file data/hole layout
// Based on fiemap
// To abort: abortStream <- error
// Check status: err := <- errStream
// Usage: go RetrieveLayoutStream(...)
func RetrieveLayoutStream(abortStream <-chan error, file *os.File, r Interval, layoutStream chan<- FileInterval, errStream chan<- error) {
	const extents = 1024
	const chunkSizeMax = 1 /*GB*/ << 30
	chunkSize := r.Len()
	if chunkSize > chunkSizeMax {
		chunkSize = chunkSizeMax
	}

	chunk := Interval{r.Begin, r.Begin + chunkSize}
	// Process file extents for each chunk
	intervalLast := Interval{chunk.Begin, chunk.Begin}
	for chunk.Begin < r.End {
		if chunk.End > r.End {
			chunk.End = r.End
		}

		for more := true; more && chunk.Len() > 0; {
			ext, errno := fibmap.Fiemap(file.Fd(), uint64(chunk.Begin), uint64(chunk.Len()), 1024)
			if errno != 0 {
				close(layoutStream)
				errStream <- &os.PathError{Op: "Fiemap", Path: file.Name(), Err: errno}
				return
			}
			if len(ext) == 0 {
				break
			}

			// Process each extent
			for _, e := range ext {
				interval := Interval{int64(e.Logical), int64(e.Logical + e.Length)}
				log.Debug("Extent:", interval, e.Flags)
				if e.Flags&fibmap.FIEMAP_EXTENT_LAST != 0 {
					more = false
				}
				if intervalLast.End < interval.Begin {
					if intervalLast.Len() > 0 {
						// Pop last Data
						layoutStream <- FileInterval{SparseData, intervalLast}
					}
					// report hole
					intervalLast = Interval{intervalLast.End, interval.Begin}
					layoutStream <- FileInterval{SparseHole, intervalLast}

					// Start data
					intervalLast = interval
				} else {
					// coalesce
					intervalLast.End = interval.End
				}
				chunk.Begin = interval.End
			}
		}
		chunk = Interval{chunk.End, chunk.End + chunkSize}
	}

	if intervalLast.Len() > 0 {
		// Pop last Data
		if intervalLast.End > r.End {
			intervalLast.End = r.End
		}
		layoutStream <- FileInterval{SparseData, intervalLast}
	}
	if intervalLast.End < r.End {
		// report hole
		layoutStream <- FileInterval{SparseHole, Interval{intervalLast.End, r.End}}
	}

	close(layoutStream)
	errStream <- nil
	return
}
Exemple #9
0
func networkSender(netStream <-chan diffChunk, encoder *gob.Encoder, netStatus chan<- netXferStatus) {
	status := true
	byteCount := int64(0)
	for {
		chunk := <-netStream
		if 0 == chunk.header.Len() {
			// eof: last 0 len header
			if verboseClient {
				log.Debug("Client.networkSender <eof>")
			}
			err := encoder.Encode(chunk.header.FileInterval)
			if err != nil {
				log.Fatal("Client protocol encoder error:", err)
				status = false
			}
			break
		}

		if !status {
			// network error
			continue // discard the chunk
		}
		if !chunk.status {
			// read error
			status = false
			continue // discard the chunk
		}

		if traceChannelLoad {
			fmt.Fprint(os.Stderr, len(netStream), "n")
		}

		// Encode and send data to the network
		if verboseClient {
			log.Debug("Client.networkSender sending:", chunk.header.FileInterval)
		}
		err := encoder.Encode(chunk.header.FileInterval)
		if err != nil {
			log.Fatal("Client protocol encoder error:", err)
			status = false
			continue
		}
		if len(chunk.header.Data) == 0 {
			continue
		}
		if verboseClient {
			log.Debug("Client.networkSender sending data")
		}
		if int64(len(chunk.header.Data)) != chunk.header.FileInterval.Len() {
			log.Fatal("Client.networkSender sending data internal error:", chunk.header.FileInterval.Len(), len(chunk.header.Data))
		}
		err = encoder.Encode(chunk.header.Data)
		if err != nil {
			log.Fatal("Client protocol encoder error:", err)
			status = false
			continue
		}
		byteCount += int64(len(chunk.header.Data))
		if traceChannelLoad {
			fmt.Fprint(os.Stderr, "N\n")
		}
	}
	netStatus <- netXferStatus{status, byteCount}
}
Exemple #10
0
func processDiff(salt []byte, abortStream chan<- error, errStream <-chan error, encoder *gob.Encoder, decoder *gob.Decoder, local <-chan HashedDataInterval, remote <-chan HashedInterval, netInStreamDone <-chan bool, retry bool) (hashLocal []byte, err error) {
	// Local:   __ _*
	// Remote:  *_ **
	hashLocal = make([]byte, 0) // empty hash for errors
	const concurrentReaders = 4
	netStream := make(chan diffChunk, 128)
	netStatus := make(chan netXferStatus)
	go networkSender(netStream, encoder, netStatus)
	fileHasher := sha1.New()
	fileHasher.Write(salt)

	lrange := <-local
	rrange := <-remote
	for lrange.Len() != 0 {
		if rrange.Len() == 0 {
			// Copy local tail
			if verboseClient {
				logData("LHASH", lrange.Data)
			}
			hashFileData(fileHasher, lrange.Len(), lrange.Data)
			processFileInterval(lrange, HashedInterval{FileInterval{SparseHole, lrange.Interval}, make([]byte, 0)}, netStream)
			lrange = <-local
			continue
		}
		// Diff
		if verboseClient {
			log.Debug("Diff:", lrange.HashedInterval, rrange)
		}
		if lrange.Begin == rrange.Begin {
			if lrange.End > rrange.End {
				data := lrange.Data
				if len(data) > 0 {
					data = lrange.Data[:rrange.Len()]
				}
				subrange := HashedDataInterval{HashedInterval{FileInterval{lrange.Kind, rrange.Interval}, lrange.Hash}, data}
				if verboseClient {
					logData("LHASH", subrange.Data)
				}

				hashFileData(fileHasher, subrange.Len(), subrange.Data)
				processFileInterval(subrange, rrange, netStream)
				if len(data) > 0 {
					lrange.Data = lrange.Data[subrange.Len():]
				}
				lrange.Begin = rrange.End
				rrange = <-remote
				continue
			} else if lrange.End < rrange.End {
				if verboseClient {
					logData("LHASH", lrange.Data)
				}

				hashFileData(fileHasher, lrange.Len(), lrange.Data)
				processFileInterval(lrange, HashedInterval{FileInterval{rrange.Kind, lrange.Interval}, make([]byte, 0)}, netStream)
				rrange.Begin = lrange.End
				lrange = <-local
				continue
			}
			if verboseClient {
				logData("LHASH", lrange.Data)
			}
			hashFileData(fileHasher, lrange.Len(), lrange.Data)
			processFileInterval(lrange, rrange, netStream)
			lrange = <-local
			rrange = <-remote
		} else {
			// Should never happen
			log.Fatal("processDiff internal error")
			return
		}
	}
	log.Info("Finished processing file diff")

	status := true
	err = <-errStream
	if err != nil {
		log.Error("Sync client file load aborted:", err)
		status = false
	}
	// make sure we finished consuming dst hashes
	status = <-netInStreamDone && status // netDstReceiver finished
	log.Info("Finished consuming remote file hashes, status=", status)

	// Send end of transmission
	netStream <- diffChunk{true, DataInterval{FileInterval{SparseIgnore, Interval{0, 0}}, make([]byte, 0)}}

	// get network sender status
	net := <-netStatus
	log.Info("Finished sending file diff of", net.byteCount, "(bytes), status=", net.status)
	if !net.status {
		err = errors.New("netwoek transfer failure")
		return
	}

	var statusRemote bool
	err = decoder.Decode(&statusRemote)
	if err != nil {
		log.Fatal("Cient protocol remote status error:", err)
		return
	}
	if !statusRemote {
		err = errors.New("failure on remote sync site")
		return
	}
	var hashRemote []byte
	err = decoder.Decode(&hashRemote)
	if err != nil {
		log.Fatal("Cient protocol remote hash error:", err)
		return
	}

	// Compare file hashes
	hashLocal = fileHasher.Sum(nil)
	if isHashDifferent(hashLocal, hashRemote) || FailPointFileHashMatch() {
		log.Warn("hashLocal =", hashLocal)
		log.Warn("hashRemote=", hashRemote)
		err = &HashCollsisionError{}
	} else {
		retry = false // success, don't retry anymore
	}

	// Final retry negotiation
	{
		err1 := encoder.Encode(retry)
		if err1 != nil {
			log.Fatal("Cient protocol remote retry error:", err)
		}
		err1 = decoder.Decode(&statusRemote)
		if err1 != nil {
			log.Fatal("Cient protocol remote retry status error:", err)
		}
	}
	return
}
Exemple #11
0
// Validator merges source and diff data; produces hash of the destination file
func Validator(salt []byte, checksumStream, netInStream <-chan DataInterval, resultStream chan<- []byte) {
	fileHasher := sha1.New()
	//TODO: error handling
	fileHasher.Write(salt)
	r := <-checksumStream // original dst file data
	q := <-netInStream    // diff data
	for q.Len() != 0 || r.Len() != 0 {
		if r.Len() == 0 /*end of dst file*/ {
			// Hash diff data
			if verboseServer {
				logData("RHASH", q.Data)
			}
			hashFileData(fileHasher, q.Len(), q.Data)
			q = <-netInStream
		} else if q.Len() == 0 /*end of diff file*/ {
			// Hash original data
			if verboseServer {
				logData("RHASH", r.Data)
			}
			hashFileData(fileHasher, r.Len(), r.Data)
			r = <-checksumStream
		} else {
			qi := q.Interval
			ri := r.Interval
			if qi.Begin == ri.Begin {
				if qi.End > ri.End {
					log.Fatal("Server.Validator internal error, diff=", q.FileInterval, "local=", r.FileInterval)
				} else if qi.End < ri.End {
					// Hash diff data
					if verboseServer {
						log.Debug("Server.Validator: hashing diff", q.FileInterval, r.FileInterval)
					}
					if verboseServer {
						logData("RHASH", q.Data)
					}
					hashFileData(fileHasher, q.Len(), q.Data)
					r.Begin = q.End
					q = <-netInStream
				} else {
					if q.Kind == SparseIgnore {
						// Hash original data
						if verboseServer {
							log.Debug("Server.Validator: hashing original", r.FileInterval)
						}
						if verboseServer {
							logData("RHASH", r.Data)
						}
						hashFileData(fileHasher, r.Len(), r.Data)
					} else {
						// Hash diff data
						if verboseServer {
							log.Debug("Server.Validator: hashing diff", q.FileInterval)
						}
						if verboseServer {
							logData("RHASH", q.Data)
						}
						hashFileData(fileHasher, q.Len(), q.Data)
					}
					q = <-netInStream
					r = <-checksumStream
				}
			} else {
				log.Fatal("Server.Validator internal error, diff=", q.FileInterval, "local=", r.FileInterval)
			}
		}
	}

	if verboseServer {
		log.Debug("Server.Validator: finished")
	}
	resultStream <- fileHasher.Sum(nil)
}