/
main.go
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/
main.go
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"strconv"
"time"
"github.com/MainfluxLabs/mainflux"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
"golang.org/x/sync/errgroup"
logger "github.com/MainfluxLabs/mainflux/logger"
"github.com/MainfluxLabs/mainflux/pkg/errors"
"github.com/MainfluxLabs/mainflux/pkg/messaging"
"github.com/MainfluxLabs/mainflux/pkg/messaging/brokers"
thingsapi "github.com/MainfluxLabs/mainflux/things/api/grpc"
adapter "github.com/MainfluxLabs/mainflux/ws"
"github.com/MainfluxLabs/mainflux/ws/api"
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"
"google.golang.org/grpc/credentials/insecure"
)
const (
stopWaitTime = 5 * time.Second
defPort = "8190"
defBrokerURL = "nats://localhost:4222"
defLogLevel = "error"
defClientTLS = "false"
defCACerts = ""
defJaegerURL = ""
defThingsGRPCURL = "localhost:8183"
defThingsGRPCTimeout = "1s"
envPort = "MF_WS_ADAPTER_PORT"
envBrokerURL = "MF_BROKER_URL"
envLogLevel = "MF_WS_ADAPTER_LOG_LEVEL"
envClientTLS = "MF_WS_ADAPTER_CLIENT_TLS"
envCACerts = "MF_WS_ADAPTER_CA_CERTS"
envJaegerURL = "MF_JAEGER_URL"
envThingsGRPCURL = "MF_THINGS_AUTH_GRPC_URL"
envThingsGRPCTimeout = "MF_THINGS_AUTH_GRPC_TIMEOUT"
)
type config struct {
port string
brokerURL string
logLevel string
clientTLS bool
caCerts string
jaegerURL string
thingsGRPCURL string
thingsGRPCTimeout time.Duration
}
func main() {
cfg := loadConfig()
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
logger, err := logger.New(os.Stdout, cfg.logLevel)
if err != nil {
log.Fatalf(err.Error())
}
conn := connectToThings(cfg, logger)
defer conn.Close()
thingsTracer, thingsCloser := initJaeger("things", cfg.jaegerURL, logger)
defer thingsCloser.Close()
tc := thingsapi.NewClient(conn, thingsTracer, cfg.thingsGRPCTimeout)
nps, 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 nps.Close()
svc := newService(tc, nps, logger)
g.Go(func() error {
return startWSServer(ctx, cfg, svc, logger)
})
g.Go(func() error {
if sig := errors.SignalHandler(ctx); sig != nil {
cancel()
logger.Info(fmt.Sprintf("WS adapter service shutdown by signal: %s", sig))
}
return nil
})
if err := g.Wait(); err != nil {
logger.Error(fmt.Sprintf("WS adapter 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)
}
thingsGRPCTimeout, err := time.ParseDuration(mainflux.Env(envThingsGRPCTimeout, defThingsGRPCTimeout))
if err != nil {
log.Fatalf("Invalid %s value: %s", envThingsGRPCTimeout, err.Error())
}
return config{
brokerURL: mainflux.Env(envBrokerURL, defBrokerURL),
port: mainflux.Env(envPort, defPort),
logLevel: mainflux.Env(envLogLevel, defLogLevel),
clientTLS: tls,
caCerts: mainflux.Env(envCACerts, defCACerts),
jaegerURL: mainflux.Env(envJaegerURL, defJaegerURL),
thingsGRPCURL: mainflux.Env(envThingsGRPCURL, defThingsGRPCURL),
thingsGRPCTimeout: thingsGRPCTimeout,
}
}
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.WithTransportCredentials(insecure.NewCredentials()))
}
conn, err := grpc.Dial(cfg.thingsGRPCURL, 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(tc mainflux.ThingsServiceClient, nps messaging.PubSub, logger logger.Logger) adapter.Service {
svc := adapter.New(tc, nps)
svc = api.LoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "ws_adapter",
Subsystem: "api",
Name: "reqeust_count",
Help: "Number of requests received",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "ws_adapter",
Subsystem: "api",
Name: "request_latency_microsecond",
Help: "Total duration of requests in microseconds",
}, []string{"method"}),
)
return svc
}
func startWSServer(ctx context.Context, cfg config, svc adapter.Service, l logger.Logger) error {
p := fmt.Sprintf(":%s", cfg.port)
errCh := make(chan error, 2)
server := &http.Server{Addr: p, Handler: api.MakeHandler(svc, l)}
l.Info(fmt.Sprintf("WS adapter service started, exposed port %s", cfg.port))
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 {
l.Error(fmt.Sprintf("WS adapter service error occurred during shutdown at %s: %s", p, err))
return fmt.Errorf("WS adapter service error occurred during shutdown at %s: %w", p, err)
}
l.Info(fmt.Sprintf("WS adapter service shutdown at %s", p))
return nil
case err := <-errCh:
return err
}
}