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main.go
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/*
Copyright 2022 Ondat.
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 main
import (
"html/template"
"log"
"net/http"
"os"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
configondatv1 "github.com/ondat/metrics-exporter/api/config.storageos.com/v1"
)
const (
address = ":9100"
endpoint = "/metrics"
)
var (
scheme = runtime.NewScheme()
)
func init() {
// +kubebuilder:scaffold:scheme
utilruntime.Must(configondatv1.AddToScheme(scheme))
}
func main() {
configFile, cfg := getConfigOrDie()
level, err := zapcore.ParseLevel(cfg.LogLevel)
if err != nil {
log.Printf("failed to parse log level %s: %s\n", cfg.LogLevel, err.Error())
os.Exit(1)
}
loggerConfig := zap.NewProductionConfig()
loggerConfig.EncoderConfig.EncodeTime = zapcore.RFC3339NanoTimeEncoder
loggerConfig.Level.SetLevel(level)
logger, err := loggerConfig.Build()
if err != nil {
log.Printf("failed to build logger from desired config: %s\n", err.Error())
os.Exit(1)
}
defer func() { _ = logger.Sync() }()
log := logger.Sugar()
if len(configFile) > 0 {
log.Debugf("Loaded config file \"%s\"", configFile)
}
log.Debugf("Serve metrics timeout set to %d seconds", cfg.Timeout)
metricsCollectors := GetEnabledMetricsCollectors(log, cfg.DisabledCollectors)
if len(metricsCollectors) == 0 {
log.Fatal("there is nothing to do with all metrics collectors disabled")
}
prometheusRegistry := prometheus.NewRegistry()
_ = prometheusRegistry.Register(NewCollectorGroup(log, metricsCollectors))
// k8s endpoints
http.HandleFunc("/healthz", healthz)
http.HandleFunc("/readyz", readyz)
// metrics page
http.Handle(endpoint, promhttp.HandlerFor(
prometheusRegistry,
promhttp.HandlerOpts{
// the request will continue on the background but the user requests
// gets the correct timeout response
Timeout: time.Second * time.Duration(cfg.Timeout),
ErrorHandling: promhttp.ContinueOnError,
},
))
// landing page
// prometheus.io/docs/instrumenting/writing_exporters/#landing-page
var templ = template.Must(template.ParseFiles("index.html"))
http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
data := struct {
Title string
MetricsEndpoint string
}{
Title: "Metrics exporter",
MetricsEndpoint: endpoint,
}
_ = templ.Execute(w, &data)
w.Header().Set("Content-Type", "text/html")
}))
log.Infow("starting http handler", "port", address)
if err := http.ListenAndServe(address, nil); err != nil {
log.Errorw("error running http server", "error", err)
os.Exit(1)
}
}
// healthz is a liveness probe.
func healthz(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
}
// readyz is a readyness probe.
func readyz(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
}