add tracing and refactor some api pkgs

internal/tracing/config/config.go

@@ -0,0 +1,61 @@
+package config
+
+import (
+	"encoding/json"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+
+	"github.com/caos/zitadel/internal/tracing"
+	tracing_g "github.com/caos/zitadel/internal/tracing/google"
+	tracing_log "github.com/caos/zitadel/internal/tracing/log"
+)
+
+type TracingConfig struct {
+	Type   string
+	Config tracing.Config
+}
+
+var tracer = map[string]func() tracing.Config{
+	"google": func() tracing.Config { return &tracing_g.Config{} },
+	"log":    func() tracing.Config { return &tracing_log.Config{} },
+}
+
+func (c *TracingConfig) UnmarshalJSON(data []byte) error {
+	var rc struct {
+		Type   string
+		Config json.RawMessage
+	}
+
+	if err := json.Unmarshal(data, &rc); err != nil {
+		return status.Errorf(codes.Internal, "%v parse config: %v", "TRACE-vmjS", err)
+	}
+
+	c.Type = rc.Type
+
+	var err error
+	c.Config, err = newTracingConfig(c.Type, rc.Config)
+	if err != nil {
+		return status.Errorf(codes.Internal, "%v parse config: %v", "TRACE-Ws9E", err)
+	}
+
+	return c.Config.NewTracer()
+}
+
+func newTracingConfig(tracerType string, configData []byte) (tracing.Config, error) {
+	t, ok := tracer[tracerType]
+	if !ok {
+		return nil, status.Errorf(codes.Internal, "%v No config: %v", "TRACE-HMEJ", tracerType)
+	}
+
+	tracingConfig := t()
+	if len(configData) == 0 {
+		return tracingConfig, nil
+	}
+
+	if err := json.Unmarshal(configData, tracingConfig); err != nil {
+		return nil, status.Errorf(codes.Internal, "%v Could not read conifg: %v", "TRACE-1tSS", err)
+	}
+
+	return tracingConfig, nil
+}