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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 (
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"strconv"
"syscall"
"time"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
"github.com/mainflux/mainflux"
authapi "github.com/mainflux/mainflux/authn/api/grpc"
"github.com/mainflux/mainflux/logger"
"github.com/mainflux/mainflux/pkg/messaging"
"github.com/mainflux/mainflux/pkg/messaging/nats"
localusers "github.com/mainflux/mainflux/things/users"
"github.com/mainflux/mainflux/twins"
"github.com/mainflux/mainflux/twins/api"
twapi "github.com/mainflux/mainflux/twins/api/http"
twmongodb "github.com/mainflux/mainflux/twins/mongodb"
"github.com/mainflux/mainflux/twins/tracing"
"github.com/mainflux/mainflux/twins/uuid"
opentracing "github.com/opentracing/opentracing-go"
stdprometheus "github.com/prometheus/client_golang/prometheus"
jconfig "github.com/uber/jaeger-client-go/config"
"go.mongodb.org/mongo-driver/mongo"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const (
queue = "twins"
defLogLevel = "error"
defHTTPPort = "8180"
defJaegerURL = ""
defServerCert = ""
defServerKey = ""
defDB = "mainflux-twins"
defDBHost = "localhost"
defDBPort = "27017"
defSingleUserEmail = ""
defSingleUserToken = ""
defClientTLS = "false"
defCACerts = ""
defChannelID = ""
defNatsURL = "nats://localhost:4222"
defAuthnURL = "localhost:8181"
defAuthnTimeout = "1" // in seconds
envLogLevel = "MF_TWINS_LOG_LEVEL"
envHTTPPort = "MF_TWINS_HTTP_PORT"
envJaegerURL = "MF_JAEGER_URL"
envServerCert = "MF_TWINS_SERVER_CERT"
envServerKey = "MF_TWINS_SERVER_KEY"
envDB = "MF_TWINS_DB"
envDBHost = "MF_TWINS_DB_HOST"
envDBPort = "MF_TWINS_DB_PORT"
envSingleUserEmail = "MF_TWINS_SINGLE_USER_EMAIL"
envSingleUserToken = "MF_TWINS_SINGLE_USER_TOKEN"
envClientTLS = "MF_TWINS_CLIENT_TLS"
envCACerts = "MF_TWINS_CA_CERTS"
envChannelID = "MF_TWINS_CHANNEL_ID"
envNatsURL = "MF_NATS_URL"
envAuthnURL = "MF_AUTHN_GRPC_URL"
envAuthnTimeout = "MF_AUTHN_GRPC_TIMEOUT"
)
type config struct {
logLevel string
httpPort string
jaegerURL string
serverCert string
serverKey string
dbCfg twmongodb.Config
singleUserEmail string
singleUserToken string
clientTLS bool
caCerts string
channelID string
natsURL string
authnURL string
authnTimeout time.Duration
}
func main() {
cfg := loadConfig()
logger, err := logger.New(os.Stdout, cfg.logLevel)
if err != nil {
log.Fatalf(err.Error())
}
db, err := twmongodb.Connect(cfg.dbCfg, logger)
if err != nil {
logger.Error(err.Error())
os.Exit(1)
}
authTracer, authCloser := initJaeger("auth", cfg.jaegerURL, logger)
defer authCloser.Close()
auth, _ := createAuthClient(cfg, authTracer, logger)
dbTracer, dbCloser := initJaeger("twins_db", cfg.jaegerURL, logger)
defer dbCloser.Close()
pubSub, err := nats.NewPubSub(cfg.natsURL, queue, logger)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to NATS: %s", err))
os.Exit(1)
}
defer pubSub.Close()
svc := newService(pubSub, cfg.channelID, auth, dbTracer, db, logger)
tracer, closer := initJaeger("twins", cfg.jaegerURL, logger)
defer closer.Close()
errs := make(chan error, 2)
go startHTTPServer(twapi.MakeHandler(tracer, svc), cfg.httpPort, cfg, logger, errs)
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT)
errs <- fmt.Errorf("%s", <-c)
}()
err = <-errs
logger.Error(fmt.Sprintf("Twins service terminated: %s", err))
}
func loadConfig() config {
tls, err := strconv.ParseBool(mainflux.Env(envClientTLS, defClientTLS))
if err != nil {
log.Fatalf("Invalid value passed for %s\n", envClientTLS)
}
timeout, err := strconv.ParseInt(mainflux.Env(envAuthnTimeout, defAuthnTimeout), 10, 64)
if err != nil {
log.Fatalf("Invalid %s value: %s", envAuthnTimeout, err.Error())
}
dbCfg := twmongodb.Config{
Name: mainflux.Env(envDB, defDB),
Host: mainflux.Env(envDBHost, defDBHost),
Port: mainflux.Env(envDBPort, defDBPort),
}
return config{
logLevel: mainflux.Env(envLogLevel, defLogLevel),
httpPort: mainflux.Env(envHTTPPort, defHTTPPort),
serverCert: mainflux.Env(envServerCert, defServerCert),
serverKey: mainflux.Env(envServerKey, defServerKey),
jaegerURL: mainflux.Env(envJaegerURL, defJaegerURL),
dbCfg: dbCfg,
singleUserEmail: mainflux.Env(envSingleUserEmail, defSingleUserEmail),
singleUserToken: mainflux.Env(envSingleUserToken, defSingleUserToken),
clientTLS: tls,
caCerts: mainflux.Env(envCACerts, defCACerts),
channelID: mainflux.Env(envChannelID, defChannelID),
natsURL: mainflux.Env(envNatsURL, defNatsURL),
authnURL: mainflux.Env(envAuthnURL, defAuthnURL),
authnTimeout: time.Duration(timeout) * time.Second,
}
}
func initJaeger(svcName, url string, logger logger.Logger) (opentracing.Tracer, io.Closer) {
if url == "" {
return opentracing.NoopTracer{}, ioutil.NopCloser(nil)
}
tracer, closer, err := jconfig.Configuration{
ServiceName: svcName,
Sampler: &jconfig.SamplerConfig{
Type: "const",
Param: 1,
},
Reporter: &jconfig.ReporterConfig{
LocalAgentHostPort: url,
LogSpans: true,
},
}.NewTracer()
if err != nil {
logger.Error(fmt.Sprintf("Failed to init Jaeger client: %s", err))
os.Exit(1)
}
return tracer, closer
}
func createAuthClient(cfg config, tracer opentracing.Tracer, logger logger.Logger) (mainflux.AuthNServiceClient, func() error) {
if cfg.singleUserEmail != "" && cfg.singleUserToken != "" {
return localusers.NewSingleUserService(cfg.singleUserEmail, cfg.singleUserToken), nil
}
conn := connectToAuth(cfg, logger)
return authapi.NewClient(tracer, conn, cfg.authnTimeout), conn.Close
}
func connectToAuth(cfg config, logger logger.Logger) *grpc.ClientConn {
var opts []grpc.DialOption
if cfg.clientTLS {
if cfg.caCerts != "" {
tpc, err := credentials.NewClientTLSFromFile(cfg.caCerts, "")
if err != nil {
logger.Error(fmt.Sprintf("Failed to create tls credentials: %s", err))
os.Exit(1)
}
opts = append(opts, grpc.WithTransportCredentials(tpc))
}
} else {
opts = append(opts, grpc.WithInsecure())
logger.Info("gRPC communication is not encrypted")
}
conn, err := grpc.Dial(cfg.authnURL, opts...)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to authn service: %s", err))
os.Exit(1)
}
return conn
}
func newService(ps messaging.PubSub, chanID string, users mainflux.AuthNServiceClient, dbTracer opentracing.Tracer, db *mongo.Database, logger logger.Logger) twins.Service {
twinRepo := twmongodb.NewTwinRepository(db)
twinRepo = tracing.TwinRepositoryMiddleware(dbTracer, twinRepo)
stateRepo := twmongodb.NewStateRepository(db)
stateRepo = tracing.StateRepositoryMiddleware(dbTracer, stateRepo)
idp := uuid.New()
svc := twins.New(ps, users, twinRepo, stateRepo, idp, chanID, logger)
svc = api.LoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "twins",
Subsystem: "api",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "twins",
Subsystem: "api",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
err := ps.Subscribe(nats.SubjectAllChannels, func(msg messaging.Message) error {
if msg.Channel == chanID {
return nil
}
if err := svc.SaveStates(&msg); err != nil {
logger.Error(fmt.Sprintf("State save failed: %s", err))
return err
}
return nil
})
if err != nil {
logger.Error(err.Error())
os.Exit(1)
}
return svc
}
func startHTTPServer(handler http.Handler, port string, cfg config, logger logger.Logger, errs chan error) {
p := fmt.Sprintf(":%s", port)
if cfg.serverCert != "" || cfg.serverKey != "" {
logger.Info(fmt.Sprintf("Twins service started using https on port %s with cert %s key %s",
port, cfg.serverCert, cfg.serverKey))
errs <- http.ListenAndServeTLS(p, cfg.serverCert, cfg.serverKey, handler)
return
}
logger.Info(fmt.Sprintf("Twins service started using http on port %s", cfg.httpPort))
errs <- http.ListenAndServe(p, handler)
}