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main.go
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main.go
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"fmt"
"log"
"net/http"
"os"
"time"
"github.com/MainfluxLabs/mainflux"
"github.com/MainfluxLabs/mainflux/consumers"
"github.com/MainfluxLabs/mainflux/consumers/writers/api"
"github.com/MainfluxLabs/mainflux/consumers/writers/postgres"
"github.com/MainfluxLabs/mainflux/logger"
"github.com/MainfluxLabs/mainflux/pkg/errors"
"github.com/MainfluxLabs/mainflux/pkg/messaging/brokers"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
"github.com/jmoiron/sqlx"
stdprometheus "github.com/prometheus/client_golang/prometheus"
"golang.org/x/sync/errgroup"
)
const (
svcName = "postgres-writer"
stopWaitTime = 5 * time.Second
defLogLevel = "error"
defBrokerURL = "nats://localhost:4222"
defPort = "8180"
defDBHost = "localhost"
defDBPort = "5432"
defDBUser = "mainflux"
defDBPass = "mainflux"
defDB = "mainflux"
defDBSSLMode = "disable"
defDBSSLCert = ""
defDBSSLKey = ""
defDBSSLRootCert = ""
envBrokerURL = "MF_BROKER_URL"
envLogLevel = "MF_POSTGRES_WRITER_LOG_LEVEL"
envPort = "MF_POSTGRES_WRITER_PORT"
envDBHost = "MF_POSTGRES_WRITER_DB_HOST"
envDBPort = "MF_POSTGRES_WRITER_DB_PORT"
envDBUser = "MF_POSTGRES_WRITER_DB_USER"
envDBPass = "MF_POSTGRES_WRITER_DB_PASS"
envDB = "MF_POSTGRES_WRITER_DB"
envDBSSLMode = "MF_POSTGRES_WRITER_DB_SSL_MODE"
envDBSSLCert = "MF_POSTGRES_WRITER_DB_SSL_CERT"
envDBSSLKey = "MF_POSTGRES_WRITER_DB_SSL_KEY"
envDBSSLRootCert = "MF_POSTGRES_WRITER_DB_SSL_ROOT_CERT"
)
type config struct {
brokerURL string
logLevel string
port string
dbConfig postgres.Config
}
func main() {
cfg := loadConfig()
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
logger, err := logger.New(os.Stdout, cfg.logLevel)
if err != nil {
log.Fatalf(err.Error())
}
pubSub, err := brokers.NewPubSub(cfg.brokerURL, "", logger)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to message broker: %s", err))
os.Exit(1)
}
defer pubSub.Close()
db := connectToDB(cfg.dbConfig, logger)
defer db.Close()
repo := newService(db, logger)
if err = consumers.Start(svcName, pubSub, repo, brokers.SubjectSenML, brokers.SubjectJSON); err != nil {
logger.Error(fmt.Sprintf("Failed to create Postgres writer: %s", err))
}
g.Go(func() error {
return startHTTPServer(ctx, cfg.port, logger)
})
g.Go(func() error {
if sig := errors.SignalHandler(ctx); sig != nil {
cancel()
logger.Info(fmt.Sprintf("Postgres writer service shutdown by signal: %s", sig))
}
return nil
})
if err := g.Wait(); err != nil {
logger.Error(fmt.Sprintf("Postgres writer service terminated: %s", err))
}
}
func loadConfig() config {
dbConfig := postgres.Config{
Host: mainflux.Env(envDBHost, defDBHost),
Port: mainflux.Env(envDBPort, defDBPort),
User: mainflux.Env(envDBUser, defDBUser),
Pass: mainflux.Env(envDBPass, defDBPass),
Name: mainflux.Env(envDB, defDB),
SSLMode: mainflux.Env(envDBSSLMode, defDBSSLMode),
SSLCert: mainflux.Env(envDBSSLCert, defDBSSLCert),
SSLKey: mainflux.Env(envDBSSLKey, defDBSSLKey),
SSLRootCert: mainflux.Env(envDBSSLRootCert, defDBSSLRootCert),
}
return config{
brokerURL: mainflux.Env(envBrokerURL, defBrokerURL),
logLevel: mainflux.Env(envLogLevel, defLogLevel),
port: mainflux.Env(envPort, defPort),
dbConfig: dbConfig,
}
}
func connectToDB(dbConfig postgres.Config, logger logger.Logger) *sqlx.DB {
db, err := postgres.Connect(dbConfig)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to Postgres: %s", err))
os.Exit(1)
}
return db
}
func newService(db *sqlx.DB, logger logger.Logger) consumers.Consumer {
svc := postgres.New(db)
svc = api.LoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "postgres",
Subsystem: "message_writer",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "postgres",
Subsystem: "message_writer",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
return svc
}
func startHTTPServer(ctx context.Context, port string, logger logger.Logger) error {
p := fmt.Sprintf(":%s", port)
errCh := make(chan error)
server := &http.Server{Addr: p, Handler: api.MakeHandler(svcName)}
logger.Info(fmt.Sprintf("Postgres writer service started, exposed port %s", port))
go func() {
errCh <- server.ListenAndServe()
}()
select {
case <-ctx.Done():
ctxShutdown, cancelShutdown := context.WithTimeout(context.Background(), stopWaitTime)
defer cancelShutdown()
if err := server.Shutdown(ctxShutdown); err != nil {
logger.Error(fmt.Sprintf("Postgres writer service error occurred during shutdown at %s: %s", p, err))
return fmt.Errorf("postgres writer service occurred during shutdown at %s: %w", p, err)
}
logger.Info(fmt.Sprintf("Postgres writer service shutdown of http at %s", p))
return nil
case err := <-errCh:
return err
}
}