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metrics.go
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/
metrics.go
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// Copyright 2018 The Nakama Authors
//
// 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 server
import (
"context"
"fmt"
"net/http"
"time"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"github.com/prometheus/client_golang/prometheus"
ocprometheus "go.opencensus.io/exporter/prometheus"
"go.opencensus.io/exporter/stackdriver"
"go.opencensus.io/stats/view"
"go.uber.org/zap"
)
type Metrics struct {
prometheusHTTPServer *http.Server
}
func NewMetrics(logger, startupLogger *zap.Logger, config Config) *Metrics {
m := &Metrics{}
view.SetReportingPeriod(time.Duration(config.GetMetrics().ReportingFreqSec) * time.Second)
if config.GetMetrics().StackdriverProjectID != "" {
m.initStackdriver(logger, startupLogger, config)
}
if config.GetMetrics().PrometheusPort > 0 {
m.initPrometheus(logger, startupLogger, config)
}
return m
}
func (m *Metrics) initStackdriver(logger, startupLogger *zap.Logger, config Config) {
prefix := config.GetName()
if config.GetMetrics().Namespace != "" {
prefix += "-" + config.GetMetrics().Namespace
}
exporter, err := stackdriver.NewExporter(stackdriver.Options{
MetricPrefix: prefix,
ProjectID: config.GetMetrics().StackdriverProjectID,
OnError: func(err error) {
logger.Error("Could not upload data to Stackdriver", zap.Error(err))
},
})
if err != nil {
startupLogger.Fatal("Could not setup Stackdriver exporter", zap.Error(err))
}
view.RegisterExporter(exporter)
}
func (m *Metrics) initPrometheus(logger, startupLogger *zap.Logger, config Config) {
prefix := config.GetName()
if config.GetMetrics().Namespace != "" {
prefix += "-" + config.GetMetrics().Namespace
}
registry := prometheus.NewRegistry()
exporter, err := ocprometheus.NewExporter(ocprometheus.Options{
Namespace: prefix,
Registry: registry,
OnError: func(err error) {
logger.Error("Could not upload data to Prometheus", zap.Error(err))
},
})
if err != nil {
startupLogger.Fatal("Could not setup Prometheus exporter", zap.Error(err))
}
view.RegisterExporter(exporter)
router := mux.NewRouter()
router.Handle("/", exporter).Methods("GET")
CORSHeaders := handlers.AllowedHeaders([]string{"Content-Type", "User-Agent"})
CORSOrigins := handlers.AllowedOrigins([]string{"*"})
CORSMethods := handlers.AllowedMethods([]string{"GET", "HEAD"})
handlerWithCORS := handlers.CORS(CORSHeaders, CORSOrigins, CORSMethods)(router)
m.prometheusHTTPServer = &http.Server{
Addr: fmt.Sprintf(":%d", config.GetMetrics().PrometheusPort),
ReadTimeout: time.Millisecond * time.Duration(int64(config.GetSocket().ReadTimeoutMs)),
WriteTimeout: time.Millisecond * time.Duration(int64(config.GetSocket().WriteTimeoutMs)),
IdleTimeout: time.Millisecond * time.Duration(int64(config.GetSocket().IdleTimeoutMs)),
Handler: handlerWithCORS,
}
startupLogger.Info("Starting Prometheus server for metrics requests", zap.Int("port", config.GetMetrics().PrometheusPort))
go func() {
if err := m.prometheusHTTPServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
startupLogger.Fatal("Prometheus listener failed", zap.Error(err))
}
}()
}
func (m *Metrics) Stop(logger *zap.Logger) {
if m.prometheusHTTPServer != nil {
if err := m.prometheusHTTPServer.Shutdown(context.Background()); err != nil {
logger.Error("Prometheus listener shutdown failed", zap.Error(err))
}
}
}