fix: add headers and endpoint to otel

internal/conf/tracing.go

@@ -1,5 +1,10 @@
 package conf
 
+import (
+	"encoding/json"
+	"fmt"
+)
+
 type TracingExporter = string
 
 const (
@@ -24,10 +29,25 @@ type TracingConfig struct {
 	// ServiceName is the service name to use with OpenTracing.
 	ServiceName string `default:"gotrue" split_words:"true"`
 
+	Headers TracingHeaderDecoder
+
 	// Tags are the tags to associate with OpenTracing.
 	Tags map[string]string
 }
 
 func (tc *TracingConfig) Validate() error {
 	return nil
 }
+
+type TracingHeaderDecoder map[string]string
+
+func (h *TracingHeaderDecoder) Decode(value string) error {
+	headers := make(TracingHeaderDecoder)
+	if value != "" {
+		if err := json.Unmarshal([]byte(value), &headers); err != nil {
+			return fmt.Errorf("conf: custom headers not a map[string][]string: %w", err)
+		}
+	}
+	*h = headers
+	return nil
+}

internal/observability/tracing.go

@@ -47,7 +47,11 @@ func enableOpenTelemetryTracing(ctx context.Context, tc *conf.TracingConfig) err
 
 	switch tc.ExporterProtocol {
 	case "grpc":
-		traceExporter, err = otlptracegrpc.New(ctx)
+		traceExporter, err = otlptracegrpc.New(
+			ctx,
+			otlptracegrpc.WithHeaders(tc.Headers),
+			otlptracegrpc.WithEndpoint(fmt.Sprintf("%s:%s", tc.Host, tc.Port)),
+		)
 		if err != nil {
 			return err
 		}