snapshot of https://github.com/livekit/livekit.git @ 08c5433449c106943231037d0b892895f6e92d3b (2026-09-15)

pkg/service/requestid.go

@@ -0,0 +1,53 @@
+// Copyright 2026 LiveKit, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package service
+
+import (
+	"context"
+
+	"github.com/livekit/protocol/utils/guid"
+)
+
+// RequestIDAttribute is the participant attribute stamped with the request id
+// for calls that join a room before dialing. A
+// retry finds the existing participant with a matching value and skips the dial.
+const RequestIDAttribute = "lk.request_id"
+
+type requestIDKey struct{}
+
+// WithRequestID stores the client idempotency id on the context and propagates
+// it to downstream services via outgoing metadata. A no-op when id is empty.
+func WithRequestID(ctx context.Context, id string) context.Context {
+	if id == "" {
+		return ctx
+	}
+	return context.WithValue(ctx, requestIDKey{}, id)
+}
+
+func RequestID(ctx context.Context) string {
+	if id, ok := ctx.Value(requestIDKey{}).(string); ok && id != "" {
+		return id
+	}
+	return ""
+}
+
+// DeterministicID derives a stable resource id from the request id — retries of the same logical call
+// yield the same id and dedup at the store. With no request id it falls back to a random id.
+func DeterministicID(prefix, requestID string) string {
+	if requestID == "" {
+		return guid.New(prefix)
+	}
+	return guid.Hash(prefix, []byte(requestID))
+}