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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 (
"context"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"strconv"
"time"
"google.golang.org/grpc/credentials"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
"github.com/mainflux/mainflux"
adapter "github.com/mainflux/mainflux/http"
"github.com/mainflux/mainflux/http/api"
"github.com/mainflux/mainflux/logger"
"github.com/mainflux/mainflux/pkg/errors"
"github.com/mainflux/mainflux/pkg/messaging/nats"
thingsapi "github.com/mainflux/mainflux/things/api/auth/grpc"
"github.com/opentracing/opentracing-go"
stdprometheus "github.com/prometheus/client_golang/prometheus"
jconfig "github.com/uber/jaeger-client-go/config"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
)
const (
stopWaitTime = 5 * time.Second
defLogLevel = "error"
defClientTLS = "false"
defCACerts = ""
defPort = "8180"
defNatsURL = "nats://localhost:4222"
defJaegerURL = ""
defThingsAuthURL = "localhost:8183"
defThingsAuthTimeout = "1s"
envLogLevel = "MF_HTTP_ADAPTER_LOG_LEVEL"
envClientTLS = "MF_HTTP_ADAPTER_CLIENT_TLS"
envCACerts = "MF_HTTP_ADAPTER_CA_CERTS"
envPort = "MF_HTTP_ADAPTER_PORT"
envNatsURL = "MF_NATS_URL"
envJaegerURL = "MF_JAEGER_URL"
envThingsAuthURL = "MF_THINGS_AUTH_GRPC_URL"
envThingsAuthTimeout = "MF_THINGS_AUTH_GRPC_TIMEOUT"
)
type config struct {
natsURL string
logLevel string
port string
clientTLS bool
caCerts string
jaegerURL string
thingsAuthURL string
thingsAuthTimeout 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()
tracer, closer := initJaeger("http_adapter", cfg.jaegerURL, logger)
defer closer.Close()
thingsTracer, thingsCloser := initJaeger("things", cfg.jaegerURL, logger)
defer thingsCloser.Close()
pub, err := nats.NewPublisher(cfg.natsURL)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to NATS: %s", err))
os.Exit(1)
}
defer pub.Close()
tc := thingsapi.NewClient(conn, thingsTracer, cfg.thingsAuthTimeout)
svc := adapter.New(pub, tc)
svc = api.LoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "http_adapter",
Subsystem: "api",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "http_adapter",
Subsystem: "api",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
g.Go(func() error {
return startHTTPServer(ctx, svc, cfg, logger, tracer)
})
g.Go(func() error {
if sig := errors.SignalHandler(ctx); sig != nil {
cancel()
logger.Info(fmt.Sprintf("HTTP adapter service shutdown by signal: %s", sig))
}
return nil
})
if err := g.Wait(); err != nil {
logger.Error(fmt.Sprintf("HTTP 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)
}
authTimeout, err := time.ParseDuration(mainflux.Env(envThingsAuthTimeout, defThingsAuthTimeout))
if err != nil {
log.Fatalf("Invalid %s value: %s", envThingsAuthTimeout, err.Error())
}
return config{
natsURL: mainflux.Env(envNatsURL, defNatsURL),
logLevel: mainflux.Env(envLogLevel, defLogLevel),
port: mainflux.Env(envPort, defPort),
clientTLS: tls,
caCerts: mainflux.Env(envCACerts, defCACerts),
jaegerURL: mainflux.Env(envJaegerURL, defJaegerURL),
thingsAuthURL: mainflux.Env(envThingsAuthURL, defThingsAuthURL),
thingsAuthTimeout: authTimeout,
}
}
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 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.thingsAuthURL, opts...)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to things service: %s", err))
os.Exit(1)
}
return conn
}
func startHTTPServer(ctx context.Context, svc adapter.Service, cfg config, logger logger.Logger, tracer opentracing.Tracer) error {
p := fmt.Sprintf(":%s", cfg.port)
errCh := make(chan error)
server := &http.Server{Addr: p, Handler: api.MakeHandler(svc, tracer, logger)}
logger.Info(fmt.Sprintf("HTTP adapter service started on 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 {
logger.Error(fmt.Sprintf("HTTP adapter service error occurred during shutdown at %s: %s", p, err))
return fmt.Errorf("http adapter service error occurred during shutdown at %s: %w", p, err)
}
logger.Info(fmt.Sprintf("HTTP adapter service shutdown of http at %s", p))
return nil
case err := <-errCh:
return err
}
}