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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 (
"crypto/aes"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"strconv"
"syscall"
"time"
authapi "github.com/mainflux/mainflux/authn/api/grpc"
rediscons "github.com/mainflux/mainflux/bootstrap/redis/consumer"
redisprod "github.com/mainflux/mainflux/bootstrap/redis/producer"
"github.com/mainflux/mainflux/logger"
opentracing "github.com/opentracing/opentracing-go"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
r "github.com/go-redis/redis"
"github.com/jmoiron/sqlx"
"github.com/mainflux/mainflux"
"github.com/mainflux/mainflux/bootstrap"
api "github.com/mainflux/mainflux/bootstrap/api"
"github.com/mainflux/mainflux/bootstrap/postgres"
mflog "github.com/mainflux/mainflux/logger"
mfsdk "github.com/mainflux/mainflux/pkg/sdk/go"
stdprometheus "github.com/prometheus/client_golang/prometheus"
jconfig "github.com/uber/jaeger-client-go/config"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const (
defLogLevel = "error"
defDBHost = "localhost"
defDBPort = "5432"
defDBUser = "mainflux"
defDBPass = "mainflux"
defDB = "bootstrap"
defDBSSLMode = "disable"
defDBSSLCert = ""
defDBSSLKey = ""
defDBSSLRootCert = ""
defEncryptKey = "12345678910111213141516171819202"
defClientTLS = "false"
defCACerts = ""
defPort = "8180"
defServerCert = ""
defServerKey = ""
defBaseURL = "http://localhost"
defThingsPrefix = ""
defThingsESURL = "localhost:6379"
defThingsESPass = ""
defThingsESDB = "0"
defESURL = "localhost:6379"
defESPass = ""
defESDB = "0"
defESConsumerName = "bootstrap"
defJaegerURL = ""
defAuthnURL = "localhost:8181"
defAuthnTimeout = "1" // in seconds
envLogLevel = "MF_BOOTSTRAP_LOG_LEVEL"
envDBHost = "MF_BOOTSTRAP_DB_HOST"
envDBPort = "MF_BOOTSTRAP_DB_PORT"
envDBUser = "MF_BOOTSTRAP_DB_USER"
envDBPass = "MF_BOOTSTRAP_DB_PASS"
envDB = "MF_BOOTSTRAP_DB"
envDBSSLMode = "MF_BOOTSTRAP_DB_SSL_MODE"
envDBSSLCert = "MF_BOOTSTRAP_DB_SSL_CERT"
envDBSSLKey = "MF_BOOTSTRAP_DB_SSL_KEY"
envDBSSLRootCert = "MF_BOOTSTRAP_DB_SSL_ROOT_CERT"
envEncryptKey = "MF_BOOTSTRAP_ENCRYPT_KEY"
envClientTLS = "MF_BOOTSTRAP_CLIENT_TLS"
envCACerts = "MF_BOOTSTRAP_CA_CERTS"
envPort = "MF_BOOTSTRAP_PORT"
envServerCert = "MF_BOOTSTRAP_SERVER_CERT"
envServerKey = "MF_BOOTSTRAP_SERVER_KEY"
envBaseURL = "MF_SDK_BASE_URL"
envThingsPrefix = "MF_SDK_THINGS_PREFIX"
envThingsESURL = "MF_THINGS_ES_URL"
envThingsESPass = "MF_THINGS_ES_PASS"
envThingsESDB = "MF_THINGS_ES_DB"
envESURL = "MF_BOOTSTRAP_ES_URL"
envESPass = "MF_BOOTSTRAP_ES_PASS"
envESDB = "MF_BOOTSTRAP_ES_DB"
envESConsumerName = "MF_BOOTSTRAP_EVENT_CONSUMER"
envJaegerURL = "MF_JAEGER_URL"
envAuthnURL = "MF_AUTHN_GRPC_URL"
envAuthnTimeout = "MF_AUTHN_GRPC_TIMEOUT"
)
type config struct {
logLevel string
dbConfig postgres.Config
clientTLS bool
encKey []byte
caCerts string
httpPort string
serverCert string
serverKey string
baseURL string
thingsPrefix string
esThingsURL string
esThingsPass string
esThingsDB string
esURL string
esPass string
esDB string
esConsumerName string
jaegerURL string
authnURL string
authnTimeout time.Duration
}
func main() {
cfg := loadConfig()
logger, err := mflog.New(os.Stdout, cfg.logLevel)
if err != nil {
log.Fatalf(err.Error())
}
db := connectToDB(cfg.dbConfig, logger)
defer db.Close()
thingsESConn := connectToRedis(cfg.esThingsURL, cfg.esThingsPass, cfg.esThingsDB, logger)
defer thingsESConn.Close()
esClient := connectToRedis(cfg.esURL, cfg.esPass, cfg.esDB, logger)
defer esClient.Close()
authTracer, authCloser := initJaeger("auth", cfg.jaegerURL, logger)
defer authCloser.Close()
authConn := connectToAuth(cfg, logger)
defer authConn.Close()
auth := authapi.NewClient(authTracer, authConn, cfg.authnTimeout)
svc := newService(auth, db, logger, esClient, cfg)
errs := make(chan error, 2)
go startHTTPServer(svc, cfg, logger, errs)
go subscribeToThingsES(svc, thingsESConn, cfg.esConsumerName, logger)
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT)
errs <- fmt.Errorf("%s", <-c)
}()
err = <-errs
logger.Error(fmt.Sprintf("Bootstrap service terminated: %s", err))
}
func loadConfig() config {
tls, err := strconv.ParseBool(mainflux.Env(envClientTLS, defClientTLS))
if err != nil {
tls = false
}
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),
}
timeout, err := strconv.ParseInt(mainflux.Env(envAuthnTimeout, defAuthnTimeout), 10, 64)
if err != nil {
log.Fatalf("Invalid %s value: %s", envAuthnTimeout, err.Error())
}
encKey, err := hex.DecodeString(mainflux.Env(envEncryptKey, defEncryptKey))
if err != nil {
log.Fatalf("Invalid %s value: %s", envEncryptKey, err.Error())
}
if err := os.Unsetenv(envEncryptKey); err != nil {
log.Fatalf("Unable to unset %s value: %s", envEncryptKey, err.Error())
}
if _, err := aes.NewCipher(encKey); err != nil {
log.Fatalf("Invalid %s value: %s", envEncryptKey, err.Error())
}
return config{
logLevel: mainflux.Env(envLogLevel, defLogLevel),
dbConfig: dbConfig,
clientTLS: tls,
encKey: encKey,
caCerts: mainflux.Env(envCACerts, defCACerts),
httpPort: mainflux.Env(envPort, defPort),
serverCert: mainflux.Env(envServerCert, defServerCert),
serverKey: mainflux.Env(envServerKey, defServerKey),
baseURL: mainflux.Env(envBaseURL, defBaseURL),
thingsPrefix: mainflux.Env(envThingsPrefix, defThingsPrefix),
esThingsURL: mainflux.Env(envThingsESURL, defThingsESURL),
esThingsPass: mainflux.Env(envThingsESPass, defThingsESPass),
esThingsDB: mainflux.Env(envThingsESDB, defThingsESDB),
esURL: mainflux.Env(envESURL, defESURL),
esPass: mainflux.Env(envESPass, defESPass),
esDB: mainflux.Env(envESDB, defESDB),
esConsumerName: mainflux.Env(envESConsumerName, defESConsumerName),
jaegerURL: mainflux.Env(envJaegerURL, defJaegerURL),
authnURL: mainflux.Env(envAuthnURL, defAuthnURL),
authnTimeout: time.Duration(timeout) * time.Second,
}
}
func connectToDB(cfg postgres.Config, logger mflog.Logger) *sqlx.DB {
db, err := postgres.Connect(cfg)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to postgres: %s", err))
os.Exit(1)
}
return db
}
func connectToRedis(redisURL, redisPass, redisDB string, logger mflog.Logger) *r.Client {
db, err := strconv.Atoi(redisDB)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to redis: %s", err))
os.Exit(1)
}
return r.NewClient(&r.Options{
Addr: redisURL,
Password: redisPass,
DB: db,
})
}
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 newService(auth mainflux.AuthNServiceClient, db *sqlx.DB, logger mflog.Logger, esClient *r.Client, cfg config) bootstrap.Service {
thingsRepo := postgres.NewConfigRepository(db, logger)
config := mfsdk.Config{
BaseURL: cfg.baseURL,
ThingsPrefix: cfg.thingsPrefix,
}
sdk := mfsdk.NewSDK(config)
svc := bootstrap.New(auth, thingsRepo, sdk, cfg.encKey)
svc = redisprod.NewEventStoreMiddleware(svc, esClient)
svc = api.NewLoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "bootstrap",
Subsystem: "api",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "bootstrap",
Subsystem: "api",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
return svc
}
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 startHTTPServer(svc bootstrap.Service, cfg config, logger mflog.Logger, errs chan error) {
p := fmt.Sprintf(":%s", cfg.httpPort)
if cfg.serverCert != "" || cfg.serverKey != "" {
logger.Info(fmt.Sprintf("Bootstrap service started using https on port %s with cert %s key %s",
cfg.httpPort, cfg.serverCert, cfg.serverKey))
errs <- http.ListenAndServeTLS(p, cfg.serverCert, cfg.serverKey, api.MakeHandler(svc, bootstrap.NewConfigReader(cfg.encKey)))
return
}
logger.Info(fmt.Sprintf("Bootstrap service started using http on port %s", cfg.httpPort))
errs <- http.ListenAndServe(p, api.MakeHandler(svc, bootstrap.NewConfigReader(cfg.encKey)))
}
func subscribeToThingsES(svc bootstrap.Service, client *r.Client, consumer string, logger mflog.Logger) {
eventStore := rediscons.NewEventStore(svc, client, consumer, logger)
logger.Info("Subscribed to Redis Event Store")
if err := eventStore.Subscribe("mainflux.things"); err != nil {
logger.Warn(fmt.Sprintf("Bootstrap service failed to subscribe to event sourcing: %s", err))
}
}