fix: make async webhooks fully async

ory · Feb 16, 2023 · 950a51d · 950a51d
1 parent bb12fe7
commit 950a51d
Showing 1 changed file with 62 additions and 61 deletions.
diff --git a/selfservice/hook/web_hook.go b/selfservice/hook/web_hook.go
@@ -266,63 +266,74 @@ func (e *WebHook) ExecuteSettingsPrePersistHook(_ http.ResponseWriter, req *http
 }
 
 func (e *WebHook) execute(ctx context.Context, data *templateContext) error {
-	builder, err := request.NewBuilder(e.conf, e.deps)
-	if err != nil {
-		return err
-	}
-
-	req, err := builder.BuildRequest(ctx, data)
-	if errors.Is(err, request.ErrCancel) {
-		return nil
-	} else if err != nil {
-		return err
-	}
-
-	attrs := semconv.HTTPClientAttributesFromHTTPRequest(req.Request)
-	if data.Identity != nil {
-		attrs = append(attrs,
-			attribute.String("webhook.identity.id", data.Identity.ID.String()),
-			attribute.String("webhook.identity.nid", data.Identity.NID.String()),
-		)
-	}
-
 	var (
 		httpClient     = e.deps.HTTPClient(ctx)
 		ignoreResponse = gjson.GetBytes(e.conf, "response.ignore").Bool()
 		canInterrupt   = gjson.GetBytes(e.conf, "can_interrupt").Bool()
 		parseResponse  = gjson.GetBytes(e.conf, "response.parse").Bool()
 		tracer         = trace.SpanFromContext(ctx).TracerProvider().Tracer("kratos-webhooks")
-		spanOpts       = []trace.SpanStartOption{trace.WithAttributes(attrs...)}
-		errChan        = make(chan error, 1)
 	)
-
 	if ignoreResponse && (parseResponse || canInterrupt) {
 		return errors.WithStack(herodot.ErrInternalServerError.WithReasonf("A webhook is configured to ignore the response but also to parse the response. This is not possible."))
 	}
 
-	ctx, span := tracer.Start(ctx, "selfservice.webhook", spanOpts...)
-	e.deps.Logger().WithRequest(req.Request).Info("Dispatching webhook")
-
-	req = req.WithContext(ctx)
-	if ignoreResponse {
-		// This is one of the few places where spawning a context.Background() is ok. We need to do this
-		// because the function runs asynchronously and we don't want to cancel the request if the
-		// incoming request context is cancelled.
-		//
-		// The webhook will still cancel after 30 seconds as that is the configured timeout for the HTTP client.
-		req = req.WithContext(trace.ContextWithSpan(context.Background(), span))
-	}
+	makeRequest := func() (finalErr error) {
+		if ignoreResponse {
+			// This is one of the few places where spawning a context.Background() is ok. We need to do this
+			// because the function runs asynchronously and we don't want to cancel the request if the
+			// incoming request context is cancelled.
+			//
+			// The webhook will still cancel after 30 seconds as that is the configured timeout for the HTTP client.
+			var cancel context.CancelFunc
+			ctx, cancel = context.WithTimeout(context.Background(), httpClient.HTTPClient.Timeout)
+			defer cancel()
+		}
+		ctx, span := tracer.Start(ctx, "selfservice.webhook")
+		startTime := time.Now()
+
+		defer func() {
+			traceID, spanID := span.SpanContext().TraceID(), span.SpanContext().SpanID()
+			logger := e.deps.Logger().WithField("otel", map[string]string{
+				"trace_id": traceID.String(),
+				"span_id":  spanID.String(),
+			})
+			if finalErr != nil {
+				logger.WithField("duration", time.Since(startTime)).WithError(finalErr).Warning("Webhook request failed but the error was ignored because the configuration indicated that the upstream response should be ignored.")
+			} else {
+				logger.WithField("duration", time.Since(startTime)).Info("Webhook request succeeded")
+			}
+		}()
+
+		builder, err := request.NewBuilder(e.conf, e.deps)
+		if err != nil {
+			return err
+		}
+
+		req, err := builder.BuildRequest(ctx, data)
+		if errors.Is(err, request.ErrCancel) {
+			return nil
+		} else if err != nil {
+			return err
+		}
+
+		span.SetAttributes(semconv.HTTPClientAttributesFromHTTPRequest(req.Request)...)
+		if data.Identity != nil {
+			span.SetAttributes(
+				attribute.String("webhook.identity.id", data.Identity.ID.String()),
+				attribute.String("webhook.identity.nid", data.Identity.NID.String()),
+			)
+		}
+
+		e.deps.Logger().WithRequest(req.Request).Info("Dispatching webhook")
+
+		req = req.WithContext(ctx)
 
-	startTime := time.Now()
-	go func() {
-		defer close(errChan)
 		defer span.End()
 
 		resp, err := httpClient.Do(req)
 		if err != nil {
 			span.SetStatus(codes.Error, err.Error())
-			errChan <- errors.WithStack(err)
-			return
+			return errors.WithStack(err)
 		}
 		defer resp.Body.Close()
 		span.SetAttributes(semconv.HTTPAttributesFromHTTPStatusCode(resp.StatusCode)...)
@@ -332,40 +343,30 @@ func (e *WebHook) execute(ctx context.Context, data *templateContext) error {
 			if canInterrupt || parseResponse {
 				if err := parseWebhookResponse(resp, data.Identity); err != nil {
 					span.SetStatus(codes.Error, err.Error())
-					errChan <- err
+					return err
 				}
 			}
-			errChan <- fmt.Errorf("webhook failed with status code %v", resp.StatusCode)
-			return
+			return fmt.Errorf("webhook failed with status code %v", resp.StatusCode)
 		}
 
 		if parseResponse {
 			if err := parseWebhookResponse(resp, data.Identity); err != nil {
 				span.SetStatus(codes.Error, err.Error())
-				errChan <- err
+				return err
 			}
 		}
 
-		errChan <- nil
-	}()
-
-	if ignoreResponse {
-		traceID, spanID := span.SpanContext().TraceID(), span.SpanContext().SpanID()
-		logger := e.deps.Logger().WithField("otel", map[string]string{
-			"trace_id": traceID.String(),
-			"span_id":  spanID.String(),
-		})
-		go func() {
-			if err := <-errChan; err != nil {
-				logger.WithField("duration", time.Since(startTime)).WithError(err).Warning("Webhook request failed but the error was ignored because the configuration indicated that the upstream response should be ignored.")
-			} else {
-				logger.WithField("duration", time.Since(startTime)).Info("Webhook request succeeded")
-			}
-		}()
 		return nil
 	}
 
-	return <-errChan
+	if !ignoreResponse {
+		return makeRequest()
+	}
+	go func() {
+		// we cannot handle the error as we are running async, and it is logged anyway
+		_ = makeRequest()
+	}()
+	return nil
 }
 
 func parseWebhookResponse(resp *http.Response, id *identity.Identity) (err error) {