Add default config to service.

Also modify `GetServiceTraceProvider` to keep working if nil or nil
interface is passed.

ocis-pkg/tracing/tracing.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/url"
+	"reflect"
 	"strings"
 	"time"
 
@@ -29,7 +30,13 @@ var Propagator = propagation.NewCompositeTextMapPropagator(
 
 // GetServiceTraceProvider returns a configured open-telemetry trace provider.
 func GetServiceTraceProvider(c ConfigConverter, serviceName string) (trace.TracerProvider, error) {
-	cfg := c.Convert()
+	var cfg Config
+	if c == nil || reflect.ValueOf(c).IsNil() {
+		cfg = Config{Enabled: false}
+	} else {
+		cfg = c.Convert()
+	}
+
 	if cfg.Enabled {
 		return GetTraceProvider(cfg.Endpoint, cfg.Collector, serviceName, cfg.Type)
 	}

services/eventhistory/pkg/config/defaults/defaultconfig.go

@@ -59,6 +59,17 @@ func EnsureDefaults(cfg *config.Config) {
 		cfg.Log = &config.Log{}
 	}
 
+	if cfg.Tracing == nil && cfg.Commons != nil && cfg.Commons.Tracing != nil {
+		cfg.Tracing = &config.Tracing{
+			Enabled:   cfg.Commons.Tracing.Enabled,
+			Type:      cfg.Commons.Tracing.Type,
+			Endpoint:  cfg.Commons.Tracing.Endpoint,
+			Collector: cfg.Commons.Tracing.Collector,
+		}
+	} else if cfg.Tracing == nil {
+		cfg.Tracing = &config.Tracing{}
+	}
+
 	if cfg.GRPCClientTLS == nil && cfg.Commons != nil {
 		cfg.GRPCClientTLS = structs.CopyOrZeroValue(cfg.Commons.GRPCClientTLS)
 	}