Add HTTP client update function to tracing library

Signed-off-by: Derek McGowan <derek@mcg.dev>

tracing/tracing.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"net/http"
 
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
@@ -47,6 +48,16 @@ func WithHTTPRequest(_ *http.Request) SpanOpt {
 	}
 }
 
+// UpdateHTTPClient updates the http client with the necessary otel transport
+func UpdateHTTPClient(client *http.Client, name string) {
+	client.Transport = otelhttp.NewTransport(
+		client.Transport,
+		otelhttp.WithSpanNameFormatter(func(operation string, r *http.Request) string {
+			return name
+		}),
+	)
+}
+
 // StartSpan starts child span in a context.
 func StartSpan(ctx context.Context, opName string, opts ...SpanOpt) (context.Context, *Span) {
 	config := StartConfig{}