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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"
"strings"
"syscall"
"time"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
"github.com/gocql/gocql"
"github.com/mainflux/mainflux"
"github.com/mainflux/mainflux/logger"
"github.com/mainflux/mainflux/readers"
"github.com/mainflux/mainflux/readers/api"
"github.com/mainflux/mainflux/readers/cassandra"
thingsapi "github.com/mainflux/mainflux/things/api/auth/grpc"
opentracing "github.com/opentracing/opentracing-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 (
sep = ","
defLogLevel = "error"
defPort = "8180"
defCluster = "127.0.0.1"
defKeyspace = "mainflux"
defDBUsername = ""
defDBPassword = ""
defDBPort = "9042"
defThingsURL = "localhost:8181"
defClientTLS = "false"
defCACerts = ""
defJaegerURL = ""
defThingsTimeout = "1" // in seconds
envLogLevel = "MF_CASSANDRA_READER_LOG_LEVEL"
envPort = "MF_CASSANDRA_READER_PORT"
envCluster = "MF_CASSANDRA_READER_DB_CLUSTER"
envKeyspace = "MF_CASSANDRA_READER_DB_KEYSPACE"
envDBUsername = "MF_CASSANDRA_READER_DB_USERNAME"
envDBPassword = "MF_CASSANDRA_READER_DB_PASSWORD"
envDBPort = "MF_CASSANDRA_READER_DB_PORT"
envThingsURL = "MF_THINGS_URL"
envClientTLS = "MF_CASSANDRA_READER_CLIENT_TLS"
envCACerts = "MF_CASSANDRA_READER_CA_CERTS"
envJaegerURL = "MF_JAEGER_URL"
envThingsTimeout = "MF_CASSANDRA_READER_THINGS_TIMEOUT"
)
type config struct {
logLevel string
port string
dbCfg cassandra.DBConfig
thingsURL string
clientTLS bool
caCerts string
jaegerURL string
thingsTimeout time.Duration
}
func main() {
cfg := loadConfig()
logger, err := logger.New(os.Stdout, cfg.logLevel)
if err != nil {
log.Fatalf(err.Error())
}
session := connectToCassandra(cfg.dbCfg, logger)
defer session.Close()
conn := connectToThings(cfg, logger)
defer conn.Close()
thingsTracer, thingsCloser := initJaeger("things", cfg.jaegerURL, logger)
defer thingsCloser.Close()
tc := thingsapi.NewClient(conn, thingsTracer, cfg.thingsTimeout)
repo := newService(session, logger)
errs := make(chan error, 2)
go startHTTPServer(repo, tc, cfg.port, errs, logger)
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT)
errs <- fmt.Errorf("%s", <-c)
}()
err = <-errs
logger.Error(fmt.Sprintf("Cassandra reader service terminated: %s", err))
}
func loadConfig() config {
dbPort, err := strconv.Atoi(mainflux.Env(envDBPort, defDBPort))
if err != nil {
log.Fatal(err)
}
dbCfg := cassandra.DBConfig{
Hosts: strings.Split(mainflux.Env(envCluster, defCluster), sep),
Keyspace: mainflux.Env(envKeyspace, defKeyspace),
Username: mainflux.Env(envDBUsername, defDBUsername),
Password: mainflux.Env(envDBPassword, defDBPassword),
Port: dbPort,
}
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(envThingsTimeout, defThingsTimeout), 10, 64)
if err != nil {
log.Fatalf("Invalid %s value: %s", envThingsTimeout, err.Error())
}
return config{
logLevel: mainflux.Env(envLogLevel, defLogLevel),
port: mainflux.Env(envPort, defPort),
dbCfg: dbCfg,
thingsURL: mainflux.Env(envThingsURL, defThingsURL),
clientTLS: tls,
caCerts: mainflux.Env(envCACerts, defCACerts),
jaegerURL: mainflux.Env(envJaegerURL, defJaegerURL),
thingsTimeout: time.Duration(timeout) * time.Second,
}
}
func connectToCassandra(dbCfg cassandra.DBConfig, logger logger.Logger) *gocql.Session {
session, err := cassandra.Connect(dbCfg)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to Cassandra cluster: %s", err))
os.Exit(1)
}
return session
}
func connectToThings(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 load certs: %s", err))
os.Exit(1)
}
opts = append(opts, grpc.WithTransportCredentials(tpc))
}
} else {
logger.Info("gRPC communication is not encrypted")
opts = append(opts, grpc.WithInsecure())
}
conn, err := grpc.Dial(cfg.thingsURL, opts...)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to things service: %s", err))
os.Exit(1)
}
return conn
}
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(session *gocql.Session, logger logger.Logger) readers.MessageRepository {
repo := cassandra.New(session)
repo = api.LoggingMiddleware(repo, logger)
repo = api.MetricsMiddleware(
repo,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "cassandra",
Subsystem: "message_reader",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "cassandra",
Subsystem: "message_reader",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
return repo
}
func startHTTPServer(repo readers.MessageRepository, tc mainflux.ThingsServiceClient, port string, errs chan error, logger logger.Logger) {
p := fmt.Sprintf(":%s", port)
logger.Info(fmt.Sprintf("Cassandra reader service started, exposed port %s", port))
errs <- http.ListenAndServe(p, api.MakeHandler(repo, tc, "cassandra-reader"))
}