/
main.go
253 lines (226 loc) · 7.48 KB
/
main.go
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//
// Copyright (c) 2018
// Mainflux
//
// SPDX-License-Identifier: Apache-2.0
//
package main
import (
"database/sql"
"fmt"
"log"
"net"
"net/http"
"os"
"os/signal"
"strconv"
"syscall"
"google.golang.org/grpc/credentials"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
"github.com/go-redis/redis"
"github.com/mainflux/mainflux"
"github.com/mainflux/mainflux/logger"
"github.com/mainflux/mainflux/things"
"github.com/mainflux/mainflux/things/api"
grpcapi "github.com/mainflux/mainflux/things/api/grpc"
httpapi "github.com/mainflux/mainflux/things/api/http"
"github.com/mainflux/mainflux/things/postgres"
rediscache "github.com/mainflux/mainflux/things/redis"
"github.com/mainflux/mainflux/things/uuid"
usersapi "github.com/mainflux/mainflux/users/api/grpc"
stdprometheus "github.com/prometheus/client_golang/prometheus"
"google.golang.org/grpc"
)
const (
defLogLevel = "error"
defDBHost = "localhost"
defDBPort = "5432"
defDBUser = "mainflux"
defDBPass = "mainflux"
defDBName = "things"
defDBSSLMode = "disable"
defCACerts = ""
defCacheURL = "localhost:6379"
defCachePass = ""
defCacheDB = "0"
defHTTPPort = "8180"
defGRPCPort = "8181"
defServerCert = ""
defServerKey = ""
defUsersURL = "localhost:8181"
envLogLevel = "MF_THINGS_LOG_LEVEL"
envDBHost = "MF_THINGS_DB_HOST"
envDBPort = "MF_THINGS_DB_PORT"
envDBUser = "MF_THINGS_DB_USER"
envDBPass = "MF_THINGS_DB_PASS"
envDBName = "MF_THINGS_DB"
envDBSSLMode = "MF_THINGS_DB_SSL_MODE"
envCACerts = "MF_THINGS_CA_CERTS"
envCacheURL = "MF_THINGS_CACHE_URL"
envCachePass = "MF_THINGS_CACHE_PASS"
envCacheDB = "MF_THINGS_CACHE_DB"
envHTTPPort = "MF_THINGS_HTTP_PORT"
envGRPCPort = "MF_THINGS_GRPC_PORT"
envUsersURL = "MF_USERS_URL"
envServerCert = "MF_THINGS_SERVER_CERT"
envServerKey = "MF_THINGS_SERVER_KEY"
)
type config struct {
LogLevel string
DBHost string
DBPort string
DBUser string
DBPass string
DBName string
DBSSLMode string
CACerts string
CacheURL string
CachePass string
CacheDB string
HTTPPort string
GRPCPort string
UsersURL string
ServerCert string
ServerKey string
}
func main() {
cfg := loadConfig()
logger, err := logger.New(os.Stdout, cfg.LogLevel)
if err != nil {
log.Fatalf(err.Error())
}
cache := connectToCache(cfg.CacheURL, cfg.CachePass, cfg.CacheDB, logger)
db := connectToDB(cfg, logger)
defer db.Close()
conn := connectToUsersService(cfg, logger)
defer conn.Close()
svc := newService(conn, db, cache, logger)
errs := make(chan error, 2)
go startHTTPServer(svc, cfg.HTTPPort, cfg.ServerCert, cfg.ServerKey, logger, errs)
go startGRPCServer(svc, cfg.GRPCPort, cfg.ServerCert, cfg.ServerKey, 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("Things service terminated: %s", err))
}
func loadConfig() config {
return config{
LogLevel: mainflux.Env(envLogLevel, defLogLevel),
DBHost: mainflux.Env(envDBHost, defDBHost),
DBPort: mainflux.Env(envDBPort, defDBPort),
DBUser: mainflux.Env(envDBUser, defDBUser),
DBPass: mainflux.Env(envDBPass, defDBPass),
DBName: mainflux.Env(envDBName, defDBName),
DBSSLMode: mainflux.Env(envDBSSLMode, defDBSSLMode),
CACerts: mainflux.Env(envCACerts, defCACerts),
CacheURL: mainflux.Env(envCacheURL, defCacheURL),
CachePass: mainflux.Env(envCachePass, defCachePass),
CacheDB: mainflux.Env(envCacheDB, defCacheDB),
HTTPPort: mainflux.Env(envHTTPPort, defHTTPPort),
GRPCPort: mainflux.Env(envGRPCPort, defGRPCPort),
UsersURL: mainflux.Env(envUsersURL, defUsersURL),
ServerCert: mainflux.Env(envServerCert, defServerCert),
ServerKey: mainflux.Env(envServerKey, defServerKey),
}
}
func connectToCache(cacheURL, cachePass string, cacheDB string, logger logger.Logger) *redis.Client {
db, err := strconv.Atoi(cacheDB)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to cache: %s", err))
os.Exit(1)
}
return redis.NewClient(&redis.Options{
Addr: cacheURL,
Password: cachePass,
DB: db,
})
}
func connectToDB(cfg config, logger logger.Logger) *sql.DB {
db, err := postgres.Connect(cfg.DBHost, cfg.DBPort, cfg.DBName, cfg.DBUser, cfg.DBPass, cfg.DBSSLMode)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to postgres: %s", err))
os.Exit(1)
}
return db
}
func connectToUsersService(cfg config, logger logger.Logger) *grpc.ClientConn {
var opts []grpc.DialOption
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.UsersURL, opts...)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to users service: %s", err))
os.Exit(1)
}
return conn
}
func newService(conn *grpc.ClientConn, db *sql.DB, client *redis.Client, logger logger.Logger) things.Service {
users := usersapi.NewClient(conn)
thingsRepo := postgres.NewThingRepository(db, logger)
channelsRepo := postgres.NewChannelRepository(db, logger)
chanCache := rediscache.NewChannelCache(client)
thingCache := rediscache.NewThingCache(client)
idp := uuid.New()
svc := things.New(users, thingsRepo, channelsRepo, chanCache, thingCache, idp)
svc = api.LoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "things",
Subsystem: "api",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "things",
Subsystem: "api",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
return svc
}
func startHTTPServer(svc things.Service, port string, certFile string, keyFile string, logger logger.Logger, errs chan error) {
p := fmt.Sprintf(":%s", port)
if certFile != "" || keyFile != "" {
logger.Info(fmt.Sprintf("Things service started using https on port %s with cert %s key %s", port, certFile, keyFile))
errs <- http.ListenAndServeTLS(p, certFile, keyFile, httpapi.MakeHandler(svc))
} else {
logger.Info(fmt.Sprintf("Things service started using http on port %s", port))
errs <- http.ListenAndServe(p, httpapi.MakeHandler(svc))
}
}
func startGRPCServer(svc things.Service, port string, certFile string, keyFile string, logger logger.Logger, errs chan error) {
p := fmt.Sprintf(":%s", port)
listener, err := net.Listen("tcp", p)
if err != nil {
logger.Error(fmt.Sprintf("Failed to listen on port %s: %s", port, err))
}
var server *grpc.Server
if certFile != "" || keyFile != "" {
creds, err := credentials.NewServerTLSFromFile(certFile, keyFile)
if err != nil {
logger.Error(fmt.Sprintf("Failed to load things certificates: %s", err))
os.Exit(1)
}
logger.Info(fmt.Sprintf("Things gRPC service started using https on port %s with cert %s key %s", port, certFile, keyFile))
server = grpc.NewServer(grpc.Creds(creds))
} else {
logger.Info(fmt.Sprintf("Things gRPC service started using http on port %s", port))
server = grpc.NewServer()
}
mainflux.RegisterThingsServiceServer(server, grpcapi.NewServer(svc))
errs <- server.Serve(listener)
}