Esempio n. 1
0
// Connect once to the server and work the UPR stream.  If anything
// goes wrong, return our level of progress in order to let our caller
// control any potential retries.
func (d *bucketDataSource) worker(server string, workerCh chan []uint16) int {
	atomic.AddUint64(&d.stats.TotWorkerBody, 1)

	if !d.isRunning() {
		return -1
	}

	atomic.AddUint64(&d.stats.TotWorkerConnect, 1)
	connect := d.options.Connect
	if connect == nil {
		connect = memcached.Connect
	}

	client, err := connect("tcp", server)
	if err != nil {
		atomic.AddUint64(&d.stats.TotWorkerConnectErr, 1)
		d.receiver.OnError(fmt.Errorf("worker connect, server: %s, err: %v",
			server, err))
		return 0
	}
	defer client.Close()
	atomic.AddUint64(&d.stats.TotWorkerConnectOk, 1)

	if d.auth != nil {
		var user, pswd string
		var adminCred bool
		if auth, ok := d.auth.(couchbase.AuthWithSaslHandler); ok {
			user, pswd = auth.GetSaslCredentials()
			adminCred = true
		} else {
			user, pswd, _ = d.auth.GetCredentials()
		}
		if user != "" {
			atomic.AddUint64(&d.stats.TotWorkerAuth, 1)
			res, err := client.Auth(user, pswd)
			if err != nil {
				atomic.AddUint64(&d.stats.TotWorkerAuthErr, 1)
				d.receiver.OnError(fmt.Errorf("worker auth, server: %s, user: %s, err: %v",
					server, user, err))
				return 0
			}
			if res.Status != gomemcached.SUCCESS {
				atomic.AddUint64(&d.stats.TotWorkerAuthFail, 1)
				d.receiver.OnError(&AuthFailError{ServerURL: server, User: user})
				return 0
			}
			if adminCred {
				atomic.AddUint64(&d.stats.TotWorkerAuthOk, 1)
				_, err = client.SelectBucket(d.bucketName)
				if err != nil {
					atomic.AddUint64(&d.stats.TotWorkerSelBktFail, 1)
					d.receiver.OnError(fmt.Errorf("worker select bucket err: %v", err))
					return 0
				}
				atomic.AddUint64(&d.stats.TotWorkerSelBktOk, 1)
			}
		}
	}

	uprOpenName := d.options.Name
	if uprOpenName == "" {
		uprOpenName = fmt.Sprintf("cbdatasource-%x", rand.Int63())
	}

	err = UPROpen(client, uprOpenName, d.options.FeedBufferSizeBytes)
	if err != nil {
		atomic.AddUint64(&d.stats.TotWorkerUPROpenErr, 1)
		d.receiver.OnError(err)
		return 0
	}
	atomic.AddUint64(&d.stats.TotWorkerUPROpenOk, 1)

	ackBytes :=
		uint32(d.options.FeedBufferAckThreshold * float32(d.options.FeedBufferSizeBytes))

	sendCh := make(chan *gomemcached.MCRequest, 1)
	sendEndCh := make(chan struct{})
	recvEndCh := make(chan struct{})

	cleanup := func(progress int, err error) int {
		if err != nil {
			d.receiver.OnError(err)
		}
		go func() {
			<-recvEndCh
			close(sendCh)
		}()
		return progress
	}

	currVBuckets := make(map[uint16]*VBucketState)
	currVBucketsMutex := sync.Mutex{} // Protects currVBuckets.

	go func() { // Sender goroutine.
		defer close(sendEndCh)

		atomic.AddUint64(&d.stats.TotWorkerTransmitStart, 1)
		for msg := range sendCh {
			atomic.AddUint64(&d.stats.TotWorkerTransmit, 1)
			err := client.Transmit(msg)
			if err != nil {
				atomic.AddUint64(&d.stats.TotWorkerTransmitErr, 1)
				d.receiver.OnError(fmt.Errorf("client.Transmit, err: %v", err))
				return
			}
			atomic.AddUint64(&d.stats.TotWorkerTransmitOk, 1)
		}
		atomic.AddUint64(&d.stats.TotWorkerTransmitDone, 1)
	}()

	go func() { // Receiver goroutine.
		defer close(recvEndCh)

		atomic.AddUint64(&d.stats.TotWorkerReceiveStart, 1)

		var hdr [gomemcached.HDR_LEN]byte
		var pkt gomemcached.MCRequest
		var res gomemcached.MCResponse

		// Track received bytes in case we need to buffer-ack.
		recvBytesTotal := uint32(0)

		conn := client.Hijack()

		for {
			// TODO: memory allocation here.
			atomic.AddUint64(&d.stats.TotWorkerReceive, 1)
			_, err := pkt.Receive(conn, hdr[:])
			if err != nil {
				atomic.AddUint64(&d.stats.TotWorkerReceiveErr, 1)
				d.receiver.OnError(fmt.Errorf("pkt.Receive, err: %v", err))
				return
			}
			atomic.AddUint64(&d.stats.TotWorkerReceiveOk, 1)

			if pkt.Opcode == gomemcached.UPR_MUTATION ||
				pkt.Opcode == gomemcached.UPR_DELETION ||
				pkt.Opcode == gomemcached.UPR_EXPIRATION {
				atomic.AddUint64(&d.stats.TotUPRDataChange, 1)

				vbucketID := pkt.VBucket

				currVBucketsMutex.Lock()

				vbucketState := currVBuckets[vbucketID]
				if vbucketState == nil || vbucketState.State != "running" {
					currVBucketsMutex.Unlock()
					atomic.AddUint64(&d.stats.TotUPRDataChangeStateErr, 1)
					d.receiver.OnError(fmt.Errorf("error: DataChange,"+
						" wrong vbucketState: %#v, err: %v", vbucketState, err))
					return
				}

				if !vbucketState.SnapSaved {
					// NOTE: Following the ep-engine's approach, we
					// wait to persist SnapStart/SnapEnd until we see
					// the first mutation/deletion in the new snapshot
					// range.  That reduces a race window where if we
					// kill and restart this process right now after a
					// setVBucketMetaData() and before the next,
					// first-mutation-in-snapshot, then a restarted
					// stream-req using this just-saved
					// SnapStart/SnapEnd might have a lastSeq number <
					// SnapStart, where Couchbase Server will respond
					// to the stream-req with an ERANGE error code.
					v, _, err := d.getVBucketMetaData(vbucketID)
					if err != nil || v == nil {
						currVBucketsMutex.Unlock()
						d.receiver.OnError(fmt.Errorf("error: DataChange,"+
							" getVBucketMetaData, vbucketID: %d, err: %v",
							vbucketID, err))
						return
					}

					v.SnapStart = vbucketState.SnapStart
					v.SnapEnd = vbucketState.SnapEnd

					err = d.setVBucketMetaData(vbucketID, v)
					if err != nil {
						currVBucketsMutex.Unlock()
						d.receiver.OnError(fmt.Errorf("error: DataChange,"+
							" getVBucketMetaData, vbucketID: %d, err: %v",
							vbucketID, err))
						return
					}

					vbucketState.SnapSaved = true
				}

				currVBucketsMutex.Unlock()

				seq := binary.BigEndian.Uint64(pkt.Extras[:8])

				if pkt.Opcode == gomemcached.UPR_MUTATION {
					atomic.AddUint64(&d.stats.TotUPRDataChangeMutation, 1)
					err = d.receiver.DataUpdate(vbucketID, pkt.Key, seq, &pkt)
				} else {
					if pkt.Opcode == gomemcached.UPR_DELETION {
						atomic.AddUint64(&d.stats.TotUPRDataChangeDeletion, 1)
					} else {
						atomic.AddUint64(&d.stats.TotUPRDataChangeExpiration, 1)
					}
					err = d.receiver.DataDelete(vbucketID, pkt.Key, seq, &pkt)
				}

				if err != nil {
					atomic.AddUint64(&d.stats.TotUPRDataChangeErr, 1)
					d.receiver.OnError(fmt.Errorf("error: DataChange, err: %v", err))
					return
				}

				atomic.AddUint64(&d.stats.TotUPRDataChangeOk, 1)
			} else {
				res.Opcode = pkt.Opcode
				res.Opaque = pkt.Opaque
				res.Status = gomemcached.Status(pkt.VBucket)
				res.Extras = pkt.Extras
				res.Cas = pkt.Cas
				res.Key = pkt.Key
				res.Body = pkt.Body

				atomic.AddUint64(&d.stats.TotWorkerHandleRecv, 1)
				currVBucketsMutex.Lock()
				err := d.handleRecv(sendCh, currVBuckets, &res)
				currVBucketsMutex.Unlock()
				if err != nil {
					atomic.AddUint64(&d.stats.TotWorkerHandleRecvErr, 1)
					d.receiver.OnError(fmt.Errorf("error: HandleRecv, err: %v", err))
					return
				}
				atomic.AddUint64(&d.stats.TotWorkerHandleRecvOk, 1)
			}

			recvBytesTotal +=
				uint32(gomemcached.HDR_LEN) +
					uint32(len(pkt.Key)+len(pkt.Extras)+len(pkt.Body))
			if ackBytes > 0 && recvBytesTotal > ackBytes {
				atomic.AddUint64(&d.stats.TotUPRBufferAck, 1)
				ack := &gomemcached.MCRequest{Opcode: gomemcached.UPR_BUFFERACK}
				ack.Extras = make([]byte, 4) // TODO: Memory mgmt.
				binary.BigEndian.PutUint32(ack.Extras, uint32(recvBytesTotal))
				sendCh <- ack
				recvBytesTotal = 0
			}
		}
	}()

	atomic.AddUint64(&d.stats.TotWorkerBodyKick, 1)
	d.Kick("new-worker")

	for {
		select {
		case <-sendEndCh:
			atomic.AddUint64(&d.stats.TotWorkerSendEndCh, 1)
			return cleanup(0, nil)

		case <-recvEndCh:
			// If we lost a connection, then maybe a node was rebalanced out,
			// or failed over, so ask for a cluster refresh just in case.
			d.Kick("recvEndCh")

			atomic.AddUint64(&d.stats.TotWorkerRecvEndCh, 1)
			return cleanup(0, nil)

		case wantVBucketIDs, alive := <-workerCh:
			atomic.AddUint64(&d.stats.TotRefreshWorker, 1)

			if !alive {
				atomic.AddUint64(&d.stats.TotRefreshWorkerDone, 1)
				return cleanup(-1, nil) // We've been asked to shutdown.
			}

			currVBucketsMutex.Lock()
			err := d.refreshWorker(sendCh, currVBuckets, wantVBucketIDs)
			currVBucketsMutex.Unlock()
			if err != nil {
				return cleanup(0, err)
			}

			atomic.AddUint64(&d.stats.TotRefreshWorkerOk, 1)
		}
	}

	return cleanup(-1, nil) // Unreached.
}
Esempio n. 2
0
func notFound(req *gomemcached.MCRequest, s *storage) *gomemcached.MCResponse {
	var response gomemcached.MCResponse
	response.Status = gomemcached.UNKNOWN_COMMAND
	return &response
}