mirror of
https://github.com/mainflux/mainflux.git
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126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
//
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// Copyright (c) 2018
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// Mainflux
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package main
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import (
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"context"
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"fmt"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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kitprometheus "github.com/go-kit/kit/metrics/prometheus"
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"github.com/mainflux/mainflux"
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log "github.com/mainflux/mainflux/logger"
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"github.com/mainflux/mainflux/writers"
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mongodb "github.com/mainflux/mainflux/writers/mongodb"
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"github.com/mongodb/mongo-go-driver/mongo"
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nats "github.com/nats-io/go-nats"
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stdprometheus "github.com/prometheus/client_golang/prometheus"
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)
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const (
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queue = "mongodb-writer"
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defNatsURL = nats.DefaultURL
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defPort = "8180"
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defDBName = "mainflux"
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defDBHost = "localhost"
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defDBPort = "27017"
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envNatsURL = "MF_NATS_URL"
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envPort = "MF_MONGO_WRITER_PORT"
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envDBName = "MF_MONGO_WRITER_DB_NAME"
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envDBHost = "MF_MONGO_WRITER_DB_HOST"
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envDBPort = "MF_MONGO_WRITER_DB_PORT"
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)
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type config struct {
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NatsURL string
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Port string
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DBName string
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DBHost string
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DBPort string
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}
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func main() {
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cfg := loadConfigs()
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logger := log.New(os.Stdout)
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nc, err := nats.Connect(cfg.NatsURL)
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if err != nil {
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logger.Error(fmt.Sprintf("Failed to connect to NATS: %s", err))
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os.Exit(1)
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}
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defer nc.Close()
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client, err := mongo.Connect(context.Background(), fmt.Sprintf("mongodb://%s:%s", cfg.DBHost, cfg.DBPort), nil)
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if err != nil {
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logger.Error(fmt.Sprintf("Failed to connect to database: %s", err))
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os.Exit(1)
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}
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db := client.Database(cfg.DBName)
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repo := mongodb.New(db)
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counter, latency := makeMetrics()
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repo = writers.LoggingMiddleware(repo, logger)
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repo = writers.MetricsMiddleware(repo, counter, latency)
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if err := writers.Start(nc, repo, queue, logger); err != nil {
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logger.Error(fmt.Sprintf("Failed to start message writer: %s", err))
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os.Exit(1)
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}
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errs := make(chan error, 2)
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go func() {
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c := make(chan os.Signal)
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signal.Notify(c, syscall.SIGINT)
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errs <- fmt.Errorf("%s", <-c)
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}()
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go startHTTPService(cfg.Port, logger, errs)
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err = <-errs
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logger.Error(fmt.Sprintf("MongoDB writer service terminated: %s", err))
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}
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func loadConfigs() config {
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return config{
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NatsURL: mainflux.Env(envNatsURL, defNatsURL),
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Port: mainflux.Env(envPort, defPort),
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DBName: mainflux.Env(envDBName, defDBName),
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DBHost: mainflux.Env(envDBHost, defDBHost),
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DBPort: mainflux.Env(envDBPort, defDBPort),
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}
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}
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func makeMetrics() (*kitprometheus.Counter, *kitprometheus.Summary) {
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counter := kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
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Namespace: "mongodb",
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Subsystem: "message_writer",
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Name: "request_count",
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Help: "Number of database inserts.",
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}, []string{"method"})
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latency := kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
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Namespace: "mongodb",
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Subsystem: "message_writer",
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Name: "request_latency_microseconds",
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Help: "Total duration of inserts in microseconds.",
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}, []string{"method"})
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return counter, latency
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}
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func startHTTPService(port string, logger log.Logger, errs chan error) {
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p := fmt.Sprintf(":%s", port)
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logger.Info(fmt.Sprintf("Mongodb writer service started, exposed port %s", p))
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errs <- http.ListenAndServe(p, mongodb.MakeHandler())
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}
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