Golang Scope.Inc方法代码示例

// exchangeOne performs a single DNS exchange with a randomly chosen server
// out of the server list, returning the response, time, and error (if any).
// This method sets the DNSSEC OK bit on the message to true before sending
// it to the resolver in case validation isn't the resolvers default behaviour.
func (dnsResolver *DNSResolverImpl) exchangeOne(hostname string, qtype uint16, msgStats metrics.Scope) (rsp *dns.Msg, err error) {
	m := new(dns.Msg)
	// Set question type
	m.SetQuestion(dns.Fqdn(hostname), qtype)
	// Set DNSSEC OK bit for resolver
	m.SetEdns0(4096, true)

	if len(dnsResolver.Servers) < 1 {
		err = fmt.Errorf("Not configured with at least one DNS Server")
		return
	}

	dnsResolver.stats.Inc("Rate", 1)

	// Randomly pick a server
	chosenServer := dnsResolver.Servers[rand.Intn(len(dnsResolver.Servers))]

	msg, rtt, err := dnsResolver.DNSClient.Exchange(m, chosenServer)
	msgStats.TimingDuration("RTT", rtt)
	if err == nil {
		msgStats.Inc("Successes", 1)
	} else {
		msgStats.Inc("Errors", 1)
	}
	return msg, err
}

// ProfileCmd runs forever, sending Go runtime statistics to StatsD.
func ProfileCmd(stats metrics.Scope) {
	stats = stats.NewScope("Gostats")
	var memoryStats runtime.MemStats
	prevNumGC := int64(0)
	c := time.Tick(1 * time.Second)
	for range c {
		runtime.ReadMemStats(&memoryStats)

		// Gather goroutine count
		stats.Gauge("Goroutines", int64(runtime.NumGoroutine()))

		// Gather various heap metrics
		stats.Gauge("Heap.Alloc", int64(memoryStats.HeapAlloc))
		stats.Gauge("Heap.Objects", int64(memoryStats.HeapObjects))
		stats.Gauge("Heap.Idle", int64(memoryStats.HeapIdle))
		stats.Gauge("Heap.InUse", int64(memoryStats.HeapInuse))
		stats.Gauge("Heap.Released", int64(memoryStats.HeapReleased))

		// Gather various GC related metrics
		if memoryStats.NumGC > 0 {
			totalRecentGC := uint64(0)
			realBufSize := uint32(256)
			if memoryStats.NumGC < 256 {
				realBufSize = memoryStats.NumGC
			}
			for _, pause := range memoryStats.PauseNs {
				totalRecentGC += pause
			}
			gcPauseAvg := totalRecentGC / uint64(realBufSize)
			lastGC := memoryStats.PauseNs[(memoryStats.NumGC+255)%256]
			stats.Timing("Gc.PauseAvg", int64(gcPauseAvg))
			stats.Gauge("Gc.LastPause", int64(lastGC))
		}
		stats.Gauge("Gc.NextAt", int64(memoryStats.NextGC))
		// Send both a counter and a gauge here we can much more easily observe
		// the GC rate (versus the raw number of GCs) in graphing tools that don't
		// like deltas
		stats.Gauge("Gc.Count", int64(memoryStats.NumGC))
		gcInc := int64(memoryStats.NumGC) - prevNumGC
		stats.Inc("Gc.Rate", gcInc)
		prevNumGC += gcInc
	}
}

func (updater *OCSPUpdater) generateOCSPResponses(ctx context.Context, statuses []core.CertificateStatus, stats metrics.Scope) error {
	// Use the semaphore pattern from
	// https://github.com/golang/go/wiki/BoundingResourceUse to send a number of
	// GenerateOCSP / storeResponse requests in parallel, while limiting the total number of
	// outstanding requests. The number of outstanding requests equals the
	// capacity of the channel.
	sem := make(chan int, updater.parallelGenerateOCSPRequests)
	wait := func() {
		sem <- 1 // Block until there's capacity.
	}
	done := func() {
		<-sem // Indicate there's more capacity.
	}

	work := func(status core.CertificateStatus) {
		defer done()
		meta, err := updater.generateResponse(ctx, status)
		if err != nil {
			updater.log.AuditErr(fmt.Sprintf("Failed to generate OCSP response: %s", err))
			stats.Inc("Errors.ResponseGeneration", 1)
			return
		}
		updater.stats.Inc("GeneratedResponses", 1)
		err = updater.storeResponse(meta)
		if err != nil {
			updater.log.AuditErr(fmt.Sprintf("Failed to store OCSP response: %s", err))
			stats.Inc("Errors.StoreResponse", 1)
			return
		}
		stats.Inc("StoredResponses", 1)
	}

	for _, status := range statuses {
		wait()
		go work(status)
	}
	// Block until the channel reaches its full capacity again, indicating each
	// goroutine has completed.
	for i := 0; i < updater.parallelGenerateOCSPRequests; i++ {
		wait()
	}
	return nil
}

// NewAmqpRPCClient constructs an RPC client using AMQP
func NewAmqpRPCClient(
	clientQueuePrefix string,
	amqpConf *cmd.AMQPConfig,
	rpcConf *cmd.RPCServerConfig,
	stats metrics.Scope,
) (rpc *AmqpRPCCLient, err error) {
	stats = stats.NewScope("RPC")
	hostname, err := os.Hostname()
	if err != nil {
		return nil, err
	}

	randID := make([]byte, 3)
	_, err = rand.Read(randID)
	if err != nil {
		return nil, err
	}
	clientQueue := fmt.Sprintf("%s.%s.%x", clientQueuePrefix, hostname, randID)

	reconnectBase := amqpConf.ReconnectTimeouts.Base.Duration
	if reconnectBase == 0 {
		reconnectBase = 20 * time.Millisecond
	}
	reconnectMax := amqpConf.ReconnectTimeouts.Max.Duration
	if reconnectMax == 0 {
		reconnectMax = time.Minute
	}

	timeout := rpcConf.RPCTimeout.Duration
	if timeout == 0 {
		timeout = 10 * time.Second
	}

	rpc = &AmqpRPCCLient{
		serverQueue: rpcConf.Server,
		clientQueue: clientQueue,
		connection:  newAMQPConnector(clientQueue, reconnectBase, reconnectMax),
		pending:     make(map[string]chan []byte),
		timeout:     timeout,
		log:         blog.Get(),
		stats:       stats,
	}

	err = rpc.connection.connect(amqpConf)
	if err != nil {
		return nil, err
	}

	go func() {
		for {
			select {
			case msg, ok := <-rpc.connection.messages():
				if ok {
					corrID := msg.CorrelationId
					rpc.mu.RLock()
					responseChan, present := rpc.pending[corrID]
					rpc.mu.RUnlock()

					if !present {
						// occurs when a request is timed out and the arrives
						// afterwards
						stats.Inc("AfterTimeoutResponseArrivals."+clientQueuePrefix, 1)
						continue
					}

					responseChan <- msg.Body
					rpc.mu.Lock()
					delete(rpc.pending, corrID)
					rpc.mu.Unlock()
				} else {
					// chan has been closed by rpc.connection.Cancel
					rpc.log.Info(fmt.Sprintf(" [!] Client reply channel closed: %s", rpc.clientQueue))
					continue
				}
			case err = <-rpc.connection.closeChannel():
				rpc.log.Info(fmt.Sprintf(" [!] Client reply channel closed : %s", rpc.clientQueue))
				rpc.connection.reconnect(amqpConf, rpc.log)
			}
		}
	}()

	return rpc, err
}

// exchangeOne performs a single DNS exchange with a randomly chosen server
// out of the server list, returning the response, time, and error (if any).
// This method sets the DNSSEC OK bit on the message to true before sending
// it to the resolver in case validation isn't the resolvers default behaviour.
func (dnsResolver *DNSResolverImpl) exchangeOne(ctx context.Context, hostname string, qtype uint16, msgStats metrics.Scope) (*dns.Msg, error) {
	m := new(dns.Msg)
	// Set question type
	m.SetQuestion(dns.Fqdn(hostname), qtype)
	// Set DNSSEC OK bit for resolver
	m.SetEdns0(4096, true)

	if len(dnsResolver.servers) < 1 {
		return nil, fmt.Errorf("Not configured with at least one DNS Server")
	}

	dnsResolver.stats.Inc("Rate", 1)

	// Randomly pick a server
	chosenServer := dnsResolver.servers[rand.Intn(len(dnsResolver.servers))]

	client := dnsResolver.dnsClient

	tries := 1
	start := dnsResolver.clk.Now()
	msgStats.Inc("Calls", 1)
	defer func() {
		msgStats.TimingDuration("Latency", dnsResolver.clk.Now().Sub(start))
	}()
	for {
		msgStats.Inc("Tries", 1)
		ch := make(chan dnsResp, 1)

		go func() {
			rsp, rtt, err := client.Exchange(m, chosenServer)
			msgStats.TimingDuration("SingleTryLatency", rtt)
			ch <- dnsResp{m: rsp, err: err}
		}()
		select {
		case <-ctx.Done():
			msgStats.Inc("Cancels", 1)
			msgStats.Inc("Errors", 1)
			return nil, ctx.Err()
		case r := <-ch:
			if r.err != nil {
				msgStats.Inc("Errors", 1)
				operr, ok := r.err.(*net.OpError)
				isRetryable := ok && operr.Temporary()
				hasRetriesLeft := tries < dnsResolver.maxTries
				if isRetryable && hasRetriesLeft {
					tries++
					continue
				} else if isRetryable && !hasRetriesLeft {
					msgStats.Inc("RanOutOfTries", 1)
				}
			} else {
				msgStats.Inc("Successes", 1)
			}
			return r.m, r.err
		}
	}
}