| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 v3 |
| |
| import ( |
| "context" |
| ) |
| |
| import ( |
| envoy_core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3" |
| envoy_sd "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3" |
| envoy_xds "github.com/envoyproxy/go-control-plane/pkg/server/v3" |
| ) |
| |
| type CallbacksChain []envoy_xds.Callbacks |
| |
| var _ envoy_xds.Callbacks = CallbacksChain{} |
| |
| // OnStreamOpen is called once an xDS stream is open with a stream ID and the type URL (or "" for ADS). |
| // Returning an error will end processing and close the stream. OnStreamClosed will still be called. |
| func (chain CallbacksChain) OnStreamOpen(ctx context.Context, streamID int64, typ string) error { |
| for _, cb := range chain { |
| if err := cb.OnStreamOpen(ctx, streamID, typ); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| // OnStreamClosed is called immediately prior to closing an xDS stream with a stream ID. |
| func (chain CallbacksChain) OnStreamClosed(streamID int64, node *envoy_core.Node) { |
| for i := len(chain) - 1; i >= 0; i-- { |
| cb := chain[i] |
| cb.OnStreamClosed(streamID, node) |
| } |
| } |
| |
| // OnStreamRequest is called once a request is received on a stream. |
| // Returning an error will end processing and close the stream. OnStreamClosed will still be called. |
| func (chain CallbacksChain) OnStreamRequest(streamID int64, req *envoy_sd.DiscoveryRequest) error { |
| for _, cb := range chain { |
| if err := cb.OnStreamRequest(streamID, req); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| // OnStreamResponse is called immediately prior to sending a response on a stream. |
| func (chain CallbacksChain) OnStreamResponse(ctx context.Context, streamID int64, req *envoy_sd.DiscoveryRequest, resp *envoy_sd.DiscoveryResponse) { |
| for i := len(chain) - 1; i >= 0; i-- { |
| cb := chain[i] |
| cb.OnStreamResponse(ctx, streamID, req, resp) |
| } |
| } |
| |
| // OnFetchRequest is called for each Fetch request. Returning an error will end processing of the |
| // request and respond with an error. |
| func (chain CallbacksChain) OnFetchRequest(ctx context.Context, req *envoy_sd.DiscoveryRequest) error { |
| for _, cb := range chain { |
| if err := cb.OnFetchRequest(ctx, req); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| // OnFetchRequest is called for each Fetch request. Returning an error will end processing of the |
| // request and respond with an error. |
| // OnFetchResponse is called immediately prior to sending a response. |
| func (chain CallbacksChain) OnFetchResponse(req *envoy_sd.DiscoveryRequest, resp *envoy_sd.DiscoveryResponse) { |
| for i := len(chain) - 1; i >= 0; i-- { |
| cb := chain[i] |
| cb.OnFetchResponse(req, resp) |
| } |
| } |
| |
| func (chain CallbacksChain) OnDeltaStreamOpen(ctx context.Context, streamID int64, typeURL string) error { |
| for _, cb := range chain { |
| if err := cb.OnDeltaStreamOpen(ctx, streamID, typeURL); err != nil { |
| return err |
| } |
| } |
| |
| return nil |
| } |
| |
| func (chain CallbacksChain) OnDeltaStreamClosed(streamID int64, node *envoy_core.Node) { |
| for i := len(chain) - 1; i >= 0; i-- { |
| cb := chain[i] |
| cb.OnDeltaStreamClosed(streamID, node) |
| } |
| } |
| |
| func (chain CallbacksChain) OnStreamDeltaRequest(streamID int64, request *envoy_sd.DeltaDiscoveryRequest) error { |
| for _, cb := range chain { |
| if err := cb.OnStreamDeltaRequest(streamID, request); err != nil { |
| return err |
| } |
| } |
| |
| return nil |
| } |
| |
| func (chain CallbacksChain) OnStreamDeltaResponse(streamID int64, request *envoy_sd.DeltaDiscoveryRequest, response *envoy_sd.DeltaDiscoveryResponse) { |
| for i := len(chain) - 1; i >= 0; i-- { |
| cb := chain[i] |
| cb.OnStreamDeltaResponse(streamID, request, response) |
| } |
| } |