Add tracing to settings service.

This adds tracing to the settings service. It uses the otelchi package
and passes the tracing provider to the grpc and http servers.

ocis-pkg/service/grpc/option.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 	"github.com/urfave/cli/v2"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // Option defines a single option function.
@@ -12,16 +13,17 @@ type Option func(o *Options)
 
 // Options defines the available options for this package.
 type Options struct {
-	Logger     log.Logger
-	Namespace  string
-	Name       string
-	Version    string
-	Address    string
-	TLSEnabled bool
-	TLSCert    string
-	TLSKey     string
-	Context    context.Context
-	Flags      []cli.Flag
+	Logger        log.Logger
+	Namespace     string
+	Name          string
+	Version       string
+	Address       string
+	TLSEnabled    bool
+	TLSCert       string
+	TLSKey        string
+	Context       context.Context
+	Flags         []cli.Flag
+	TraceProvider trace.TracerProvider
 }
 
 // newOptions initializes the available default options.
@@ -100,3 +102,10 @@ func Flags(flags ...cli.Flag) Option {
 		o.Flags = append(o.Flags, flags...)
 	}
 }
+
+// TraceProvider provides a function to set the trace provider option.
+func TraceProvider(tp trace.TracerProvider) Option {
+	return func(o *Options) {
+		o.TraceProvider = tp
+	}
+}

ocis-pkg/service/grpc/service.go

@@ -62,9 +62,15 @@ func NewService(opts ...Option) (Service, error) {
 		micro.RegisterTTL(time.Second * 30),
 		micro.RegisterInterval(time.Second * 10),
 		micro.WrapHandler(prometheus.NewHandlerWrapper()),
-		micro.WrapClient(mtracer.NewClientWrapper()),
-		micro.WrapHandler(mtracer.NewHandlerWrapper()),
-		micro.WrapSubscriber(mtracer.NewSubscriberWrapper()),
+		micro.WrapClient(mtracer.NewClientWrapper(
+			mtracer.WithTraceProvider(sopts.TraceProvider),
+		)),
+		micro.WrapHandler(mtracer.NewHandlerWrapper(
+			mtracer.WithTraceProvider(sopts.TraceProvider),
+		)),
+		micro.WrapSubscriber(mtracer.NewSubscriberWrapper(
+			mtracer.WithTraceProvider(sopts.TraceProvider),
+		)),
 	}
 
 	return Service{micro.NewService(mopts...)}, nil