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main.go
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main.go
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// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0
// Package main contains http-adapter main function to start the http-adapter service.
package main
import (
"context"
"fmt"
"log"
"log/slog"
"net/http"
"net/url"
"os"
chclient "github.com/absmach/callhome/pkg/client"
"github.com/absmach/magistrala"
adapter "github.com/absmach/magistrala/http"
"github.com/absmach/magistrala/http/api"
"github.com/absmach/magistrala/internal"
jaegerclient "github.com/absmach/magistrala/internal/clients/jaeger"
"github.com/absmach/magistrala/internal/server"
httpserver "github.com/absmach/magistrala/internal/server/http"
mglog "github.com/absmach/magistrala/logger"
"github.com/absmach/magistrala/pkg/auth"
"github.com/absmach/magistrala/pkg/messaging"
"github.com/absmach/magistrala/pkg/messaging/brokers"
brokerstracing "github.com/absmach/magistrala/pkg/messaging/brokers/tracing"
"github.com/absmach/magistrala/pkg/messaging/handler"
"github.com/absmach/magistrala/pkg/uuid"
mproxy "github.com/absmach/mproxy/pkg/http"
"github.com/absmach/mproxy/pkg/session"
"github.com/caarlos0/env/v10"
"go.opentelemetry.io/otel/trace"
"golang.org/x/sync/errgroup"
)
const (
svcName = "http_adapter"
envPrefix = "MG_HTTP_ADAPTER_"
envPrefixAuthz = "MG_THINGS_AUTH_GRPC_"
defSvcHTTPPort = "80"
targetHTTPPort = "81"
targetHTTPHost = "http://localhost"
)
type config struct {
LogLevel string `env:"MG_HTTP_ADAPTER_LOG_LEVEL" envDefault:"info"`
BrokerURL string `env:"MG_MESSAGE_BROKER_URL" envDefault:"nats://localhost:4222"`
JaegerURL url.URL `env:"MG_JAEGER_URL" envDefault:"http://localhost:14268/api/traces"`
SendTelemetry bool `env:"MG_SEND_TELEMETRY" envDefault:"true"`
InstanceID string `env:"MG_HTTP_ADAPTER_INSTANCE_ID" envDefault:""`
TraceRatio float64 `env:"MG_JAEGER_TRACE_RATIO" envDefault:"1.0"`
}
func main() {
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
cfg := config{}
if err := env.Parse(&cfg); err != nil {
log.Fatalf("failed to load %s configuration : %s", svcName, err)
}
logger, err := mglog.New(os.Stdout, cfg.LogLevel)
if err != nil {
log.Fatalf("failed to init logger: %s", err.Error())
}
var exitCode int
defer mglog.ExitWithError(&exitCode)
if cfg.InstanceID == "" {
if cfg.InstanceID, err = uuid.New().ID(); err != nil {
logger.Error(fmt.Sprintf("failed to generate instanceID: %s", err))
exitCode = 1
return
}
}
httpServerConfig := server.Config{Port: defSvcHTTPPort}
if err := env.ParseWithOptions(&httpServerConfig, env.Options{Prefix: envPrefix}); err != nil {
logger.Error(fmt.Sprintf("failed to load %s HTTP server configuration : %s", svcName, err))
exitCode = 1
return
}
authConfig := auth.Config{}
if err := env.ParseWithOptions(&authConfig, env.Options{Prefix: envPrefixAuthz}); err != nil {
logger.Error(fmt.Sprintf("failed to load %s auth configuration : %s", svcName, err))
exitCode = 1
return
}
authClient, authHandler, err := auth.SetupAuthz(authConfig)
if err != nil {
logger.Error(err.Error())
exitCode = 1
return
}
defer authHandler.Close()
logger.Info("Successfully connected to things grpc server " + authHandler.Secure())
tp, err := jaegerclient.NewProvider(ctx, svcName, cfg.JaegerURL, cfg.InstanceID, cfg.TraceRatio)
if err != nil {
logger.Error(fmt.Sprintf("Failed to init Jaeger: %s", err))
exitCode = 1
return
}
defer func() {
if err := tp.Shutdown(ctx); err != nil {
logger.Error(fmt.Sprintf("Error shutting down tracer provider: %v", err))
}
}()
tracer := tp.Tracer(svcName)
pub, err := brokers.NewPublisher(ctx, cfg.BrokerURL)
if err != nil {
logger.Error(fmt.Sprintf("failed to connect to message broker: %s", err))
exitCode = 1
return
}
defer pub.Close()
pub = brokerstracing.NewPublisher(httpServerConfig, tracer, pub)
svc := newService(pub, authClient, logger, tracer)
targetServerCfg := server.Config{Port: targetHTTPPort}
hs := httpserver.New(ctx, cancel, svcName, targetServerCfg, api.MakeHandler(cfg.InstanceID), logger)
if cfg.SendTelemetry {
chc := chclient.New(svcName, magistrala.Version, logger, cancel)
go chc.CallHome(ctx)
}
g.Go(func() error {
return hs.Start()
})
g.Go(func() error {
return proxyHTTP(ctx, httpServerConfig, logger, svc)
})
g.Go(func() error {
return server.StopSignalHandler(ctx, cancel, logger, svcName, hs)
})
if err := g.Wait(); err != nil {
logger.Error(fmt.Sprintf("HTTP adapter service terminated: %s", err))
}
}
func newService(pub messaging.Publisher, tc magistrala.AuthzServiceClient, logger *slog.Logger, tracer trace.Tracer) session.Handler {
svc := adapter.NewHandler(pub, logger, tc)
svc = handler.NewTracing(tracer, svc)
svc = handler.LoggingMiddleware(svc, logger)
counter, latency := internal.MakeMetrics(svcName, "api")
svc = handler.MetricsMiddleware(svc, counter, latency)
return svc
}
func proxyHTTP(ctx context.Context, cfg server.Config, logger *slog.Logger, sessionHandler session.Handler) error {
address := fmt.Sprintf("%s:%s", "", cfg.Port)
target := fmt.Sprintf("%s:%s", targetHTTPHost, targetHTTPPort)
mp, err := mproxy.NewProxy(address, target, sessionHandler, logger)
if err != nil {
return err
}
http.HandleFunc("/", mp.Handler)
errCh := make(chan error)
switch {
case cfg.CertFile != "" || cfg.KeyFile != "":
go func() {
errCh <- mp.ListenTLS(cfg.CertFile, cfg.KeyFile)
}()
logger.Info(fmt.Sprintf("%s service https server listening at %s:%s with TLS cert %s and key %s", svcName, cfg.Host, cfg.Port, cfg.CertFile, cfg.KeyFile))
default:
go func() {
errCh <- mp.Listen()
}()
logger.Info(fmt.Sprintf("%s service http server listening at %s:%s without TLS", svcName, cfg.Host, cfg.Port))
}
select {
case <-ctx.Done():
logger.Info(fmt.Sprintf("proxy HTTP shutdown at %s", target))
return nil
case err := <-errCh:
return err
}
}