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metrics.go
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metrics.go
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// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rpc
import (
"sort"
sync "sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"go.uber.org/atomic"
"golang.org/x/exp/maps"
"github.com/livekit/psrpc"
"github.com/livekit/psrpc/pkg/middleware"
)
const (
livekitNamespace = "livekit"
)
type psrpcMetrics struct {
requestTime prometheus.ObserverVec
streamSendTime prometheus.ObserverVec
streamReceiveTotal *prometheus.CounterVec
streamCurrent *prometheus.GaugeVec
errorTotal *prometheus.CounterVec
}
var (
metricsBase struct {
mu sync.RWMutex
initialized bool
curryLabels prometheus.Labels
psrpcMetrics
}
metrics atomic.Pointer[psrpcMetrics]
)
type psrpcMetricsOptions struct {
curryLabels prometheus.Labels
}
type PSRPCMetricsOption func(*psrpcMetricsOptions)
func WithCurryLabels(labels prometheus.Labels) PSRPCMetricsOption {
return func(o *psrpcMetricsOptions) {
maps.Copy(o.curryLabels, labels)
}
}
func InitPSRPCStats(constLabels prometheus.Labels, opts ...PSRPCMetricsOption) {
metricsBase.mu.Lock()
if metricsBase.initialized {
metricsBase.mu.Unlock()
return
}
metricsBase.initialized = true
o := psrpcMetricsOptions{
curryLabels: prometheus.Labels{},
}
for _, opt := range opts {
opt(&o)
}
metricsBase.curryLabels = o.curryLabels
curryLabelNames := maps.Keys(o.curryLabels)
sort.Strings(curryLabelNames)
labels := append(curryLabelNames, "role", "kind", "service", "method")
streamLabels := append(curryLabelNames, "role", "service", "method")
metricsBase.requestTime = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: livekitNamespace,
Subsystem: "psrpc",
Name: "request_time_ms",
ConstLabels: constLabels,
Buckets: []float64{10, 50, 100, 300, 500, 1000, 1500, 2000, 5000, 10000},
}, labels)
metricsBase.streamSendTime = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: livekitNamespace,
Subsystem: "psrpc",
Name: "stream_send_time_ms",
ConstLabels: constLabels,
Buckets: []float64{10, 50, 100, 300, 500, 1000, 1500, 2000, 5000, 10000},
}, streamLabels)
metricsBase.streamReceiveTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: livekitNamespace,
Subsystem: "psrpc",
Name: "stream_receive_total",
ConstLabels: constLabels,
}, streamLabels)
metricsBase.streamCurrent = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: livekitNamespace,
Subsystem: "psrpc",
Name: "stream_count",
ConstLabels: constLabels,
}, streamLabels)
metricsBase.errorTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: livekitNamespace,
Subsystem: "psrpc",
Name: "error_total",
ConstLabels: constLabels,
}, labels)
metricsBase.mu.Unlock()
prometheus.MustRegister(metricsBase.requestTime)
prometheus.MustRegister(metricsBase.streamSendTime)
prometheus.MustRegister(metricsBase.streamReceiveTotal)
prometheus.MustRegister(metricsBase.streamCurrent)
prometheus.MustRegister(metricsBase.errorTotal)
CurryMetricLabels(o.curryLabels)
}
func CurryMetricLabels(labels prometheus.Labels) {
metricsBase.mu.Lock()
defer metricsBase.mu.Unlock()
if !metricsBase.initialized {
return
}
for k := range metricsBase.curryLabels {
if v, ok := labels[k]; ok {
metricsBase.curryLabels[k] = v
}
}
metrics.Store(&psrpcMetrics{
requestTime: metricsBase.requestTime.MustCurryWith(metricsBase.curryLabels),
streamSendTime: metricsBase.streamSendTime.MustCurryWith(metricsBase.curryLabels),
streamReceiveTotal: metricsBase.streamReceiveTotal.MustCurryWith(metricsBase.curryLabels),
streamCurrent: metricsBase.streamCurrent.MustCurryWith(metricsBase.curryLabels),
errorTotal: metricsBase.errorTotal.MustCurryWith(metricsBase.curryLabels),
})
}
var _ middleware.MetricsObserver = PSRPCMetricsObserver{}
type PSRPCMetricsObserver struct{}
func (o PSRPCMetricsObserver) OnUnaryRequest(role middleware.MetricRole, info psrpc.RPCInfo, duration time.Duration, err error) {
if err != nil {
metrics.Load().errorTotal.WithLabelValues(role.String(), "rpc", info.Service, info.Method).Inc()
} else if role == middleware.ClientRole {
metrics.Load().requestTime.WithLabelValues(role.String(), "rpc", info.Service, info.Method).Observe(float64(duration.Milliseconds()))
} else {
metrics.Load().requestTime.WithLabelValues(role.String(), "rpc", info.Service, info.Method).Observe(float64(duration.Milliseconds()))
}
}
func (o PSRPCMetricsObserver) OnMultiRequest(role middleware.MetricRole, info psrpc.RPCInfo, duration time.Duration, responseCount int, errorCount int) {
if responseCount == 0 {
metrics.Load().errorTotal.WithLabelValues(role.String(), "multirpc", info.Service, info.Method).Inc()
} else if role == middleware.ClientRole {
metrics.Load().requestTime.WithLabelValues(role.String(), "multirpc", info.Service, info.Method).Observe(float64(duration.Milliseconds()))
} else {
metrics.Load().requestTime.WithLabelValues(role.String(), "multirpc", info.Service, info.Method).Observe(float64(duration.Milliseconds()))
}
}
func (o PSRPCMetricsObserver) OnStreamSend(role middleware.MetricRole, info psrpc.RPCInfo, duration time.Duration, err error) {
if err != nil {
metrics.Load().errorTotal.WithLabelValues(role.String(), "stream", info.Service, info.Method).Inc()
} else {
metrics.Load().streamSendTime.WithLabelValues(role.String(), info.Service, info.Method).Observe(float64(duration.Milliseconds()))
}
}
func (o PSRPCMetricsObserver) OnStreamRecv(role middleware.MetricRole, info psrpc.RPCInfo, err error) {
if err != nil {
metrics.Load().errorTotal.WithLabelValues(role.String(), "stream", info.Service, info.Method).Inc()
} else {
metrics.Load().streamReceiveTotal.WithLabelValues(role.String(), info.Service, info.Method).Inc()
}
}
func (o PSRPCMetricsObserver) OnStreamOpen(role middleware.MetricRole, info psrpc.RPCInfo) {
metrics.Load().streamCurrent.WithLabelValues(role.String(), info.Service, info.Method).Inc()
}
func (o PSRPCMetricsObserver) OnStreamClose(role middleware.MetricRole, info psrpc.RPCInfo) {
metrics.Load().streamCurrent.WithLabelValues(role.String(), info.Service, info.Method).Dec()
}
type UnimplementedMetricsObserver struct{}
func (o UnimplementedMetricsObserver) OnUnaryRequest(role middleware.MetricRole, rpcInfo psrpc.RPCInfo, duration time.Duration, err error) {
}
func (o UnimplementedMetricsObserver) OnMultiRequest(role middleware.MetricRole, rpcInfo psrpc.RPCInfo, duration time.Duration, responseCount int, errorCount int) {
}
func (o UnimplementedMetricsObserver) OnStreamSend(role middleware.MetricRole, rpcInfo psrpc.RPCInfo, duration time.Duration, err error) {
}
func (o UnimplementedMetricsObserver) OnStreamRecv(role middleware.MetricRole, rpcInfo psrpc.RPCInfo, err error) {
}
func (o UnimplementedMetricsObserver) OnStreamOpen(role middleware.MetricRole, rpcInfo psrpc.RPCInfo) {
}
func (o UnimplementedMetricsObserver) OnStreamClose(role middleware.MetricRole, rpcInfo psrpc.RPCInfo) {
}