141 lines
3.7 KiB
Go
141 lines
3.7 KiB
Go
package main
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import (
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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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influxdata "github.com/influxdata/influxdb/client/v2"
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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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influxdb "github.com/mainflux/mainflux/writers/influxdb"
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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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name = "influxdb-writer"
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senML = "out.senml"
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prefix = "http://"
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defNatsURL = nats.DefaultURL
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defPort = "8180"
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defPointName = "messages"
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defDBName = "mainflux"
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defDBHost = "localhost"
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defDBPort = "8086"
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defDBUser = "mainflux"
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defDBPass = "mainflux"
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envNatsURL = "MF_NATS_URL"
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envPort = "MF_INFLUXDB_WRITER_PORT"
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envPoint = "MF_INFLUXDB_POINT"
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envDBName = "MF_INFLUXDB_DB_NAME"
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envDBHost = "MF_INFLUXDB_DB_HOST"
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envDBPort = "MF_INFLUXDB_DB_PORT"
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envDBUser = "MF_INFLUXDB_DB_USER"
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envDBPass = "MF_INFLUXDB_DB_PASS"
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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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PointName string
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DBName string
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DBHost string
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DBPort string
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DBUser string
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DBPass string
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}
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func main() {
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cfg, clientCfg := 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 := influxdata.NewHTTPClient(clientCfg)
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if err != nil {
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logger.Error(fmt.Sprintf("Failed to create InfluxDB client: %s", err))
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os.Exit(1)
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}
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defer client.Close()
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repo, err := influxdb.New(client, cfg.DBName, cfg.PointName)
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if err != nil {
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logger.Error(fmt.Sprintf("Failed to create InfluxDB writer: %s", err.Error()))
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os.Exit(1)
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}
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counter, latency := makeMetrices()
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if err := writers.Start(name, nc, logger, repo, counter, latency); 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("Influxdb writer service terminated: %s", err))
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}
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func loadConfigs() (config, influxdata.HTTPConfig) {
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cfg := config{
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NatsURL: mainflux.Env(envNatsURL, defNatsURL),
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PointName: mainflux.Env(envPoint, defPointName),
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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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DBUser: mainflux.Env(envDBUser, defDBUser),
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DBPass: mainflux.Env(envDBPass, defDBPass),
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}
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clientCfg := influxdata.HTTPConfig{
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Addr: fmt.Sprintf("%s%s:%s", prefix, cfg.DBHost, cfg.DBPort),
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Username: cfg.DBUser,
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Password: cfg.DBPass,
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}
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return cfg, clientCfg
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}
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func makeMetrices() (*kitprometheus.Counter, *kitprometheus.Summary) {
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counter := kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
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Namespace: "influxdb",
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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: "influxdb",
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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("Influxdb writer service started, exposed port %s", p))
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errs <- http.ListenAndServe(p, influxdb.MakeHandler())
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}
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