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main.go
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/*
* Copyright 2018 National Library of Norway.
*
* 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 (
"errors"
"fmt"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/nlnwa/veidemann-metrics/internal/frontier"
"github.com/nlnwa/veidemann-metrics/internal/logger"
"github.com/nlnwa/veidemann-metrics/internal/metrics"
"github.com/nlnwa/veidemann-metrics/internal/rethinkdb"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/zerolog/log"
"github.com/spf13/pflag"
"github.com/spf13/viper"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
const indexContent = `<!DOCTYPE html>
<html lang="en">
<head><title>Veidemann Exporter</title></head>
<body>
<h1>Veidemann Exporter</h1>
<p><a href="/metrics">Metrics</a></p>
</body>
</html>`
func main() {
pflag.String("host", "", "Host")
pflag.Int("port", 9301, "Port")
pflag.String("db-host", "rethinkdb-proxy", "Database host")
pflag.Int("db-port", 28015, "Database port")
pflag.String("db-name", "veidemann", "Database name")
pflag.String("db-username", "admin", "Database username")
pflag.String("db-password", "", "Database password")
pflag.String("frontier-host", "veidemann-frontier", "Frontier host")
pflag.Int("frontier-port", 7700, "Frontier port")
pflag.String("log-level", "info", "Log level; available levels are panic, fatal, error, warn, info, debug and trace")
pflag.String("log-formatter", "logfmt", "Log formatter; available values are logfmt and json")
pflag.Bool("log-method", false, "Log method names or not")
pflag.Parse()
_ = viper.BindPFlags(pflag.CommandLine)
replacer := strings.NewReplacer("-", "_")
viper.SetEnvKeyReplacer(replacer)
viper.AutomaticEnv()
if err := viper.BindPFlags(pflag.CommandLine); err != nil {
log.Fatal().Err(err).Msg("Failed to parse flags")
}
logger.InitLog(viper.GetString("log-level"), viper.GetString("log-formatter"), viper.GetBool("log-method"))
db := rethinkdb.NewConnection(
viper.GetString("db-host"),
viper.GetInt("db-port"),
viper.GetString("db-username"),
viper.GetString("db-password"),
viper.GetString("db-name"),
1*time.Minute)
if err := db.Connect(); err != nil {
log.Fatal().Err(err).
Str("host", viper.GetString("db-host")).
Int("port", viper.GetInt("db-port")).
Msg("Failed to connect to RethinkDB")
}
defer func() { _ = db.Close() }()
log.Info().
Str("host", viper.GetString("db-host")).
Int("port", viper.GetInt("db-port")).
Msg("Connected to RethinkDB")
if err := db.Verify(); err != nil {
_ = db.Close()
log.Fatal().Err(err).Msg("Database is not initialized")
}
frontierAddress := fmt.Sprintf("%s:%d", viper.GetString("frontier-host"), viper.GetInt("frontier-port"))
conn, err := grpc.NewClient(frontierAddress, grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
log.Fatal().Err(err).Str("address", frontierAddress).Msg("Failed to create frontier client")
}
defer conn.Close()
log.Info().Str("address", frontierAddress).Msg("Frontier channel created")
exp := metrics.New(db, frontier.New(conn))
exp.Run(30 * time.Second)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, _ = w.Write([]byte(indexContent))
})
http.Handle("/metrics", promhttp.Handler())
addr := fmt.Sprintf("%s:%d", viper.GetString("host"), viper.GetInt("port"))
server := &http.Server{Addr: addr}
go func() {
signals := make(chan os.Signal, 2)
signal.Notify(signals, os.Interrupt, syscall.SIGTERM)
sig := <-signals
log.Info().Str("signal", sig.String()).Msg("Shutting down")
_ = server.Close()
}()
// Serve metrics
log.Info().Str("address", addr).Msg("Server listening")
err = server.ListenAndServe()
if errors.Is(err, http.ErrServerClosed) {
log.Err(err).Msg("")
}
}