Golang metrics.IncCounter函數代碼示例

func (h Handler) Touch(cmd common.TouchRequest) error {
	// read metadata
	// for 0 to metadata.numChunks
	//  touch item
	// touch metadata

	// We get the metadata and not GAT it in case the key is *just* about to expire.
	// In this case if a chunk expires during the operation, we fail the touch instead of
	// leaving a key in an inconsistent state where the metadata lives on and the data is
	// incomplete. The metadata is touched last to make sure the data exists first.
	metaKey, metaData, err := getMetadata(h.rw, cmd.Key)

	if err != nil {
		if err == common.ErrKeyNotFound {
			metrics.IncCounter(MetricCmdTouchMissesMeta)
		}

		return err
	}

	// First touch all the chunks as a batch
	for i := 0; i < int(metaData.NumChunks); i++ {
		chunkKey := chunkKey(cmd.Key, i)
		if err := binprot.WriteTouchCmd(h.rw.Writer, chunkKey, cmd.Exptime); err != nil {
			return err
		}
	}

	if err := h.rw.Flush(); err != nil {
		return err
	}

	miss := false
	for i := 0; i < int(metaData.NumChunks); i++ {
		if err := simpleCmdLocal(h.rw, false); err != nil {
			if err == common.ErrKeyNotFound && !miss {
				metrics.IncCounter(MetricCmdTouchMissesChunk)
				miss = true
			}
		}
	}

	if miss {
		return common.ErrKeyNotFound
	}

	// Then touch the metadata
	if err := binprot.WriteTouchCmd(h.rw.Writer, metaKey, cmd.Exptime); err != nil {
		return err
	}
	if err := simpleCmdLocal(h.rw, true); err != nil {
		if err == common.ErrKeyNotFound {
			metrics.IncCounter(MetricCmdTouchMissesMeta)
		}
		return err
	}

	return nil
}

func (h Handler) Delete(cmd common.DeleteRequest) error {
	// read metadata
	// delete metadata
	// for 0 to metadata.numChunks
	//  delete item

	metaKey, metaData, err := getMetadata(h.rw, cmd.Key)

	if err != nil {
		if err == common.ErrKeyNotFound {
			metrics.IncCounter(MetricCmdDeleteMissesMeta)
		}
		return err
	}

	// Delete metadata first
	if err := binprot.WriteDeleteCmd(h.rw.Writer, metaKey); err != nil {
		return err
	}
	if err := simpleCmdLocal(h.rw, true); err != nil {
		if err == common.ErrKeyNotFound {
			metrics.IncCounter(MetricCmdDeleteMissesMeta)
		}
		return err
	}

	// Then delete data chunks
	for i := 0; i < int(metaData.NumChunks); i++ {
		chunkKey := chunkKey(cmd.Key, i)
		if err := binprot.WriteDeleteCmd(h.rw.Writer, chunkKey); err != nil {
			return err
		}
	}

	if err := h.rw.Flush(); err != nil {
		return err
	}

	miss := false
	for i := 0; i < int(metaData.NumChunks); i++ {
		if err := simpleCmdLocal(h.rw, false); err != nil {
			if err == common.ErrKeyNotFound && !miss {
				metrics.IncCounter(MetricCmdDeleteMissesChunk)
				miss = true
			}
		}
	}

	if miss {
		return common.ErrKeyNotFound
	}

	return nil
}

func (l *L1OnlyOrca) Gat(req common.GATRequest) error {
	metrics.IncCounter(MetricCmdGat)
	//log.Println("gat", string(req.Key))

	metrics.IncCounter(MetricCmdGatL1)
	res, err := l.l1.GAT(req)

	if err == nil {
		if res.Miss {
			metrics.IncCounter(MetricCmdGatMissesL1)
			// TODO: Account for L2
			metrics.IncCounter(MetricCmdGatMisses)
		} else {
			metrics.IncCounter(MetricCmdGatHits)
			metrics.IncCounter(MetricCmdGatHitsL1)
		}
		l.res.GAT(res)
		// There is no GetEnd call required here since this is only ever
		// done in the binary protocol, where there's no END marker.
		// Calling l.res.GetEnd was a no-op here and is just useless.
		//l.res.GetEnd(0, false)
	} else {
		metrics.IncCounter(MetricCmdGatErrors)
		metrics.IncCounter(MetricCmdGatErrorsL1)
	}

	return err
}

func (l *L1OnlyOrca) Get(req common.GetRequest) error {
	metrics.IncCounter(MetricCmdGet)
	metrics.IncCounterBy(MetricCmdGetKeys, uint64(len(req.Keys)))
	//debugString := "get"
	//for _, k := range req.Keys {
	//	debugString += " "
	//	debugString += string(k)
	//}
	//println(debugString)

	metrics.IncCounter(MetricCmdGetL1)
	metrics.IncCounterBy(MetricCmdGetKeysL1, uint64(len(req.Keys)))
	resChan, errChan := l.l1.Get(req)

	var err error

	// Read all the responses back from l.l1.
	// The contract is that the resChan will have GetResponse's for get hits and misses,
	// and the errChan will have any other errors, such as an out of memory error from
	// memcached. If any receive happens from errChan, there will be no more responses
	// from resChan.
	for {
		select {
		case res, ok := <-resChan:
			if !ok {
				resChan = nil
			} else {
				if res.Miss {
					metrics.IncCounter(MetricCmdGetMissesL1)
					metrics.IncCounter(MetricCmdGetMisses)
				} else {
					metrics.IncCounter(MetricCmdGetHits)
					metrics.IncCounter(MetricCmdGetHitsL1)
				}
				l.res.Get(res)
			}

		case getErr, ok := <-errChan:
			if !ok {
				errChan = nil
			} else {
				metrics.IncCounter(MetricCmdGetErrors)
				metrics.IncCounter(MetricCmdGetErrorsL1)
				err = getErr
			}
		}

		if resChan == nil && errChan == nil {
			break
		}
	}

	if err == nil {
		l.res.GetEnd(req.NoopOpaque, req.NoopEnd)
	}

	return err
}

func (l *L1L2Orca) Set(req common.SetRequest) error {
	//log.Println("set", string(req.Key))

	// Try L2 first
	metrics.IncCounter(MetricCmdSetL2)
	start := timer.Now()

	err := l.l2.Set(req)

	metrics.ObserveHist(HistSetL2, timer.Since(start))

	// If we fail to set in L2, don't set in L1
	if err != nil {
		metrics.IncCounter(MetricCmdSetErrorsL2)
		metrics.IncCounter(MetricCmdSetErrors)
		return err
	}
	metrics.IncCounter(MetricCmdSetSuccessL2)

	// Now set in L1. If L1 fails, we log the error and fail the request.
	// If a user was writing a new piece of information, the error would be OK,
	// since the next GET would be able to put the L2 information back into L1.
	// In the case that the user was overwriting information, a failed set in L1
	// and successful one in L2 would leave us inconsistent. If the response was
	// positive in this situation, it would look like the server successfully
	// processed the request but didn't store the information. Clients will
	// retry failed writes. In this case L2 will get two writes for the same key
	// but this is better because it is more correct overall, though less
	// efficient. Note there are no retries at this level.
	//
	// It should be noted that errors on a straight set are nearly always fatal
	// for the connection. It's likely that if this branch is taken that the
	// connections to everyone will be severed (for this one client connection)
	// and that the client will reconnect to try again.
	metrics.IncCounter(MetricCmdSetL1)
	start = timer.Now()

	err = l.l1.Set(req)

	metrics.ObserveHist(HistSetL1, timer.Since(start))

	if err != nil {
		metrics.IncCounter(MetricCmdSetErrorsL1)
		metrics.IncCounter(MetricCmdSetErrors)
		return err
	}

	metrics.IncCounter(MetricCmdSetSuccessL1)
	metrics.IncCounter(MetricCmdSetSuccess)

	return l.res.Set(req.Opaque, req.Quiet)
}

func (l *L1OnlyOrca) Replace(req common.SetRequest) error {
	//log.Println("replace", string(req.Key))

	metrics.IncCounter(MetricCmdReplaceL1)
	start := timer.Now()

	err := l.l1.Replace(req)

	metrics.ObserveHist(HistReplaceL1, timer.Since(start))

	if err == nil {
		metrics.IncCounter(MetricCmdReplaceStoredL1)
		metrics.IncCounter(MetricCmdReplaceStored)

		err = l.res.Replace(req.Opaque, req.Quiet)

	} else if err == common.ErrKeyNotFound {
		metrics.IncCounter(MetricCmdReplaceNotStoredL1)
		metrics.IncCounter(MetricCmdReplaceNotStored)
	} else {
		metrics.IncCounter(MetricCmdReplaceErrorsL1)
		metrics.IncCounter(MetricCmdReplaceErrors)
	}

	return err
}

func (l *L1L2BatchOrca) Set(req common.SetRequest) error {
	//log.Println("set", string(req.Key))

	// Try L2 first
	metrics.IncCounter(MetricCmdSetL2)
	start := timer.Now()

	err := l.l2.Set(req)

	metrics.ObserveHist(HistSetL2, timer.Since(start))

	// If we fail to set in L2, don't do anything in L1
	if err != nil {
		metrics.IncCounter(MetricCmdSetErrorsL2)
		metrics.IncCounter(MetricCmdSetErrors)
		return err
	}
	metrics.IncCounter(MetricCmdSetSuccessL2)

	// Replace the entry in L1.
	metrics.IncCounter(MetricCmdSetReplaceL1)
	start = timer.Now()

	err = l.l1.Replace(req)

	metrics.ObserveHist(HistReplaceL1, timer.Since(start))

	if err != nil {
		if err == common.ErrKeyNotFound {
			// For a replace not stored in L1, there's no problem.
			// There is no hot data to replace
			metrics.IncCounter(MetricCmdSetReplaceNotStoredL1)
		} else {
			metrics.IncCounter(MetricCmdSetReplaceErrorsL1)
			metrics.IncCounter(MetricCmdSetErrors)
			return err
		}
	} else {
		metrics.IncCounter(MetricCmdSetReplaceStoredL1)
	}

	metrics.IncCounter(MetricCmdSetSuccess)

	return l.res.Set(req.Opaque, req.Quiet)
}

func (l *L1OnlyOrca) Delete(req common.DeleteRequest) error {
	//log.Println("delete", string(req.Key))

	metrics.IncCounter(MetricCmdDeleteL1)
	start := timer.Now()

	err := l.l1.Delete(req)

	metrics.ObserveHist(HistDeleteL1, timer.Since(start))

	if err == nil {
		metrics.IncCounter(MetricCmdDeleteHits)
		metrics.IncCounter(MetricCmdDeleteHitsL1)

		l.res.Delete(req.Opaque)

	} else if err == common.ErrKeyNotFound {
		metrics.IncCounter(MetricCmdDeleteMissesL1)
		metrics.IncCounter(MetricCmdDeleteMisses)
	} else {
		metrics.IncCounter(MetricCmdDeleteErrorsL1)
		metrics.IncCounter(MetricCmdDeleteErrors)
	}

	return err
}

func (l *L1OnlyOrca) Touch(req common.TouchRequest) error {
	//log.Println("touch", string(req.Key))

	metrics.IncCounter(MetricCmdTouchL1)
	start := timer.Now()

	err := l.l1.Touch(req)

	metrics.ObserveHist(HistTouchL1, timer.Since(start))

	if err == nil {
		metrics.IncCounter(MetricCmdTouchHitsL1)
		metrics.IncCounter(MetricCmdTouchHits)

		l.res.Touch(req.Opaque)

	} else if err == common.ErrKeyNotFound {
		metrics.IncCounter(MetricCmdTouchMissesL1)
		metrics.IncCounter(MetricCmdTouchMisses)
	} else {
		metrics.IncCounter(MetricCmdTouchMissesL1)
		metrics.IncCounter(MetricCmdTouchMisses)
	}

	return err
}

func (l *L1OnlyOrca) Add(req common.SetRequest) error {
	//log.Println("add", string(req.Key))

	metrics.IncCounter(MetricCmdAddL1)
	start := timer.Now()

	err := l.l1.Add(req)

	metrics.ObserveHist(HistAddL1, timer.Since(start))

	if err == nil {
		metrics.IncCounter(MetricCmdAddStoredL1)
		metrics.IncCounter(MetricCmdAddStored)

		err = l.res.Add(req.Opaque, req.Quiet)

	} else if err == common.ErrKeyExists {
		metrics.IncCounter(MetricCmdAddNotStoredL1)
		metrics.IncCounter(MetricCmdAddNotStored)
	} else {
		metrics.IncCounter(MetricCmdAddErrorsL1)
		metrics.IncCounter(MetricCmdAddErrors)
	}

	return err
}

func readRequestHeader(r io.Reader) (RequestHeader, error) {
	buf := bufPool.Get().([]byte)

	br, err := io.ReadAtLeast(r, buf, ReqHeaderLen)
	metrics.IncCounterBy(common.MetricBytesReadRemote, uint64(br))
	if err != nil {
		bufPool.Put(buf)
		return emptyReqHeader, err
	}

	if buf[0] != MagicRequest {
		bufPool.Put(buf)
		metrics.IncCounter(MetricBinaryRequestHeadersBadMagic)
		return emptyReqHeader, ErrBadMagic
	}

	rh := reqHeadPool.Get().(RequestHeader)
	rh.Magic = buf[0]
	rh.Opcode = buf[1]
	rh.KeyLength = binary.BigEndian.Uint16(buf[2:4])
	rh.ExtraLength = buf[4]
	// ignore DataType, unused
	//rh.DataType = buf[5]
	rh.DataType = 0
	// ignore VBucket, unused
	//rh.VBucket = binary.BigEndian.Uint16(buf[6:8])
	rh.VBucket = 0
	rh.TotalBodyLength = binary.BigEndian.Uint32(buf[8:12])
	rh.OpaqueToken = binary.BigEndian.Uint32(buf[12:16])
	// ignore CAS, unused in rend
	//rh.CASToken = binary.BigEndian.Uint64(buf[16:24])
	rh.CASToken = 0

	bufPool.Put(buf)
	metrics.IncCounter(MetricBinaryRequestHeadersParsed)

	return rh, nil
}

func (l *L1OnlyOrca) Set(req common.SetRequest) error {
	//log.Println("set", string(req.Key))

	metrics.IncCounter(MetricCmdSetL1)
	start := timer.Now()

	err := l.l1.Set(req)

	metrics.ObserveHist(HistSetL1, timer.Since(start))

	if err == nil {
		metrics.IncCounter(MetricCmdSetSuccessL1)
		metrics.IncCounter(MetricCmdSetSuccess)

		err = l.res.Set(req.Opaque, req.Quiet)

	} else {
		metrics.IncCounter(MetricCmdSetErrorsL1)
		metrics.IncCounter(MetricCmdSetErrors)
	}

	return err
}

func (l *L1OnlyOrca) Touch(req common.TouchRequest) error {
	metrics.IncCounter(MetricCmdTouch)
	//log.Println("touch", string(req.Key))

	metrics.IncCounter(MetricCmdTouchL1)
	err := l.l1.Touch(req)

	if err == nil {
		metrics.IncCounter(MetricCmdTouchHitsL1)
		metrics.IncCounter(MetricCmdTouchHits)

		l.res.Touch(req.Opaque)

	} else if err == common.ErrKeyNotFound {
		metrics.IncCounter(MetricCmdTouchMissesL1)
		metrics.IncCounter(MetricCmdTouchMisses)
	} else {
		metrics.IncCounter(MetricCmdTouchMissesL1)
		metrics.IncCounter(MetricCmdTouchMisses)
	}

	return err
}

func (l *L1OnlyOrca) Add(req common.SetRequest) error {
	metrics.IncCounter(MetricCmdAdd)
	//log.Println("add", string(req.Key))

	metrics.IncCounter(MetricCmdAddL1)
	err := l.l1.Add(req)

	if err == nil {
		metrics.IncCounter(MetricCmdAddStoredL1)
		metrics.IncCounter(MetricCmdAddStored)

		err = l.res.Add(req.Opaque, req.Quiet)

	} else if err == common.ErrKeyExists {
		metrics.IncCounter(MetricCmdAddNotStoredL1)
		metrics.IncCounter(MetricCmdAddNotStored)
	} else {
		metrics.IncCounter(MetricCmdAddErrorsL1)
		metrics.IncCounter(MetricCmdAddErrors)
	}

	return err
}

func (l *L1OnlyOrca) Replace(req common.SetRequest) error {
	metrics.IncCounter(MetricCmdReplace)
	//log.Println("replace", string(req.Key))

	metrics.IncCounter(MetricCmdReplaceL1)
	err := l.l1.Replace(req)

	if err == nil {
		metrics.IncCounter(MetricCmdReplaceStoredL1)
		metrics.IncCounter(MetricCmdReplaceStored)

		err = l.res.Replace(req.Opaque, req.Quiet)

	} else if err == common.ErrKeyNotFound {
		metrics.IncCounter(MetricCmdReplaceNotStoredL1)
		metrics.IncCounter(MetricCmdReplaceNotStored)
	} else {
		metrics.IncCounter(MetricCmdReplaceErrorsL1)
		metrics.IncCounter(MetricCmdReplaceErrors)
	}

	return err
}