/
main.go
164 lines (137 loc) · 4.46 KB
/
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/mongodb"
"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"
stdprometheus "github.com/prometheus/client_golang/prometheus"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"golang.org/x/sync/errgroup"
)
const (
svcName = "mongodb-writer"
stopWaitTime = 5 * time.Second
defLogLevel = "error"
defBrokerURL = "nats://localhost:4222"
defPort = "8180"
defDB = "mainflux"
defDBHost = "localhost"
defDBPort = "27017"
envBrokerURL = "MF_BROKER_URL"
envLogLevel = "MF_MONGO_WRITER_LOG_LEVEL"
envPort = "MF_MONGO_WRITER_PORT"
envDB = "MF_MONGO_WRITER_DB"
envDBHost = "MF_MONGO_WRITER_DB_HOST"
envDBPort = "MF_MONGO_WRITER_DB_PORT"
)
type config struct {
brokerURL string
logLevel string
port string
dbName string
dbHost string
dbPort string
}
func main() {
cfg := loadConfigs()
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
logger, err := logger.New(os.Stdout, cfg.logLevel)
if err != nil {
log.Fatal(err)
}
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()
addr := fmt.Sprintf("mongodb://%s:%s", cfg.dbHost, cfg.dbPort)
client, err := mongo.Connect(context.Background(), options.Client().ApplyURI(addr))
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to database: %s", err))
os.Exit(1)
}
db := client.Database(cfg.dbName)
repo := mongodb.New(db)
counter, latency := makeMetrics()
repo = api.LoggingMiddleware(repo, logger)
repo = api.MetricsMiddleware(repo, counter, latency)
if err := consumers.Start(svcName, pubSub, repo, brokers.SubjectSenML, brokers.SubjectJSON); err != nil {
logger.Error(fmt.Sprintf("Failed to start MongoDB writer: %s", err))
os.Exit(1)
}
g.Go(func() error {
return startHTTPService(ctx, cfg.port, logger)
})
g.Go(func() error {
if sig := errors.SignalHandler(ctx); sig != nil {
cancel()
logger.Info(fmt.Sprintf("MongoDB reader service shutdown by signal: %s", sig))
}
return nil
})
if err := g.Wait(); err != nil {
logger.Error(fmt.Sprintf("MongoDB writer service terminated: %s", err))
}
}
func loadConfigs() config {
return config{
brokerURL: mainflux.Env(envBrokerURL, defBrokerURL),
logLevel: mainflux.Env(envLogLevel, defLogLevel),
port: mainflux.Env(envPort, defPort),
dbName: mainflux.Env(envDB, defDB),
dbHost: mainflux.Env(envDBHost, defDBHost),
dbPort: mainflux.Env(envDBPort, defDBPort),
}
}
func makeMetrics() (*kitprometheus.Counter, *kitprometheus.Summary) {
counter := kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "mongodb",
Subsystem: "message_writer",
Name: "request_count",
Help: "Number of database inserts.",
}, []string{"method"})
latency := kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "mongodb",
Subsystem: "message_writer",
Name: "request_latency_microseconds",
Help: "Total duration of inserts in microseconds.",
}, []string{"method"})
return counter, latency
}
func startHTTPService(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("MongoDB writer service started, exposed port %s", p))
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("MongoDB writer service error occurred during shutdown at %s: %s", p, err))
return fmt.Errorf("mongodb writer service occurred during shutdown at %s: %w", p, err)
}
logger.Info(fmt.Sprintf("MongoDB writer service shutdown of http at %s", p))
return nil
case err := <-errCh:
return err
}
}