traefik/pkg/metrics/datadog.go

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package metrics
import (
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"context"
"net"
"strings"
"time"
"github.com/go-kit/kit/metrics/dogstatsd"
"github.com/go-kit/kit/util/conn"
gokitlog "github.com/go-kit/log"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/logs"
"github.com/traefik/traefik/v3/pkg/safe"
"github.com/traefik/traefik/v3/pkg/types"
)
const (
unixAddressPrefix = "unix://"
unixAddressDatagramPrefix = "unixgram://"
unixAddressStreamPrefix = "unixstream://"
)
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var (
datadogClient *dogstatsd.Dogstatsd
datadogLoopCancelFunc context.CancelFunc
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)
// Metric names consistent with https://github.com/DataDog/integrations-extras/pull/64
const (
ddConfigReloadsName = "config.reload.total"
ddLastConfigReloadSuccessName = "config.reload.lastSuccessTimestamp"
ddOpenConnsName = "open.connections"
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ddTLSCertsNotAfterTimestampName = "tls.certs.notAfterTimestamp"
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ddEntryPointReqsName = "entrypoint.request.total"
ddEntryPointReqsTLSName = "entrypoint.request.tls.total"
ddEntryPointReqDurationName = "entrypoint.request.duration"
ddEntryPointReqsBytesName = "entrypoint.requests.bytes.total"
ddEntryPointRespsBytesName = "entrypoint.responses.bytes.total"
ddRouterReqsName = "router.request.total"
ddRouterReqsTLSName = "router.request.tls.total"
ddRouterReqsDurationName = "router.request.duration"
ddRouterReqsBytesName = "router.requests.bytes.total"
ddRouterRespsBytesName = "router.responses.bytes.total"
ddServiceReqsName = "service.request.total"
ddServiceReqsTLSName = "service.request.tls.total"
ddServiceReqsDurationName = "service.request.duration"
ddServiceRetriesName = "service.retries.total"
ddServiceServerUpName = "service.server.up"
ddServiceReqsBytesName = "service.requests.bytes.total"
ddServiceRespsBytesName = "service.responses.bytes.total"
)
// RegisterDatadog registers the metrics pusher if this didn't happen yet and creates a datadog Registry instance.
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func RegisterDatadog(ctx context.Context, config *types.Datadog) Registry {
// Ensures there is only one DataDog client sending metrics at any given time.
StopDatadog()
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// just to be sure there is a prefix defined
if config.Prefix == "" {
config.Prefix = defaultMetricsPrefix
}
datadogLogger := logs.NewGoKitWrapper(log.Logger.With().Str(logs.MetricsProviderName, "datadog").Logger())
datadogClient = dogstatsd.New(config.Prefix+".", datadogLogger)
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initDatadogClient(ctx, config, datadogLogger)
registry := &standardRegistry{
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configReloadsCounter: datadogClient.NewCounter(ddConfigReloadsName, 1.0),
lastConfigReloadSuccessGauge: datadogClient.NewGauge(ddLastConfigReloadSuccessName),
openConnectionsGauge: datadogClient.NewGauge(ddOpenConnsName),
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tlsCertsNotAfterTimestampGauge: datadogClient.NewGauge(ddTLSCertsNotAfterTimestampName),
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}
if config.AddEntryPointsLabels {
registry.epEnabled = config.AddEntryPointsLabels
registry.entryPointReqsCounter = NewCounterWithNoopHeaders(datadogClient.NewCounter(ddEntryPointReqsName, 1.0))
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registry.entryPointReqsTLSCounter = datadogClient.NewCounter(ddEntryPointReqsTLSName, 1.0)
registry.entryPointReqDurationHistogram, _ = NewHistogramWithScale(datadogClient.NewHistogram(ddEntryPointReqDurationName, 1.0), time.Second)
registry.entryPointReqsBytesCounter = datadogClient.NewCounter(ddEntryPointReqsBytesName, 1.0)
registry.entryPointRespsBytesCounter = datadogClient.NewCounter(ddEntryPointRespsBytesName, 1.0)
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}
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if config.AddRoutersLabels {
registry.routerEnabled = config.AddRoutersLabels
registry.routerReqsCounter = NewCounterWithNoopHeaders(datadogClient.NewCounter(ddRouterReqsName, 1.0))
registry.routerReqsTLSCounter = datadogClient.NewCounter(ddRouterReqsTLSName, 1.0)
registry.routerReqDurationHistogram, _ = NewHistogramWithScale(datadogClient.NewHistogram(ddRouterReqsDurationName, 1.0), time.Second)
registry.routerReqsBytesCounter = datadogClient.NewCounter(ddRouterReqsBytesName, 1.0)
registry.routerRespsBytesCounter = datadogClient.NewCounter(ddRouterRespsBytesName, 1.0)
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}
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if config.AddServicesLabels {
registry.svcEnabled = config.AddServicesLabels
registry.serviceReqsCounter = NewCounterWithNoopHeaders(datadogClient.NewCounter(ddServiceReqsName, 1.0))
registry.serviceReqsTLSCounter = datadogClient.NewCounter(ddServiceReqsTLSName, 1.0)
registry.serviceReqDurationHistogram, _ = NewHistogramWithScale(datadogClient.NewHistogram(ddServiceReqsDurationName, 1.0), time.Second)
registry.serviceRetriesCounter = datadogClient.NewCounter(ddServiceRetriesName, 1.0)
registry.serviceServerUpGauge = datadogClient.NewGauge(ddServiceServerUpName)
registry.serviceReqsBytesCounter = datadogClient.NewCounter(ddServiceReqsBytesName, 1.0)
registry.serviceRespsBytesCounter = datadogClient.NewCounter(ddServiceRespsBytesName, 1.0)
}
return registry
}
func initDatadogClient(ctx context.Context, config *types.Datadog, logger gokitlog.LoggerFunc) {
network, address := parseDatadogAddress(config.Address)
ctx, datadogLoopCancelFunc = context.WithCancel(ctx)
safe.Go(func() {
ticker := time.NewTicker(time.Duration(config.PushInterval))
defer ticker.Stop()
dialer := func(network, address string) (net.Conn, error) {
switch network {
case "unix":
// To mimic the Datadog client when the network is unix we will try to guess the UDS type.
newConn, err := net.Dial("unixgram", address)
if err != nil && strings.Contains(err.Error(), "protocol wrong type for socket") {
return net.Dial("unix", address)
}
return newConn, err
case "unixgram":
return net.Dial("unixgram", address)
case "unixstream":
return net.Dial("unix", address)
default:
return net.Dial(network, address)
}
}
datadogClient.WriteLoop(ctx, ticker.C, conn.NewManager(dialer, network, address, time.After, logger))
})
}
// StopDatadog stops the Datadog metrics pusher.
func StopDatadog() {
if datadogLoopCancelFunc != nil {
datadogLoopCancelFunc()
datadogLoopCancelFunc = nil
}
}
func parseDatadogAddress(address string) (string, string) {
network := "udp"
var addr string
switch {
case strings.HasPrefix(address, unixAddressPrefix):
network = "unix"
addr = address[len(unixAddressPrefix):]
case strings.HasPrefix(address, unixAddressDatagramPrefix):
network = "unixgram"
addr = address[len(unixAddressDatagramPrefix):]
case strings.HasPrefix(address, unixAddressStreamPrefix):
network = "unixstream"
addr = address[len(unixAddressStreamPrefix):]
case address != "":
addr = address
default:
addr = "localhost:8125"
}
return network, addr
}