| /* |
| * |
| * Copyright 2019 gRPC authors. |
| * |
| * 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 client |
| |
| import ( |
| "fmt" |
| |
| xdspb "github.com/envoyproxy/go-control-plane/envoy/api/v2" |
| "github.com/golang/protobuf/ptypes" |
| ) |
| |
| // handleCDSResponse processes an CDS response received from the xDS server. On |
| // receipt of a good response, it also invokes the registered watcher callback. |
| func (v2c *v2Client) handleCDSResponse(resp *xdspb.DiscoveryResponse) error { |
| returnUpdate := make(map[string]ClusterUpdate) |
| for _, r := range resp.GetResources() { |
| var resource ptypes.DynamicAny |
| if err := ptypes.UnmarshalAny(r, &resource); err != nil { |
| return fmt.Errorf("xds: failed to unmarshal resource in CDS response: %v", err) |
| } |
| cluster, ok := resource.Message.(*xdspb.Cluster) |
| if !ok { |
| return fmt.Errorf("xds: unexpected resource type: %T in CDS response", resource.Message) |
| } |
| v2c.logger.Infof("Resource with name: %v, type: %T, contains: %v", cluster.GetName(), cluster, cluster) |
| update, err := validateCluster(cluster) |
| if err != nil { |
| return err |
| } |
| |
| // If the Cluster message in the CDS response did not contain a |
| // serviceName, we will just use the clusterName for EDS. |
| if update.ServiceName == "" { |
| update.ServiceName = cluster.GetName() |
| } |
| v2c.logger.Debugf("Resource with name %v, type %T, value %+v added to cache", cluster.GetName(), update, update) |
| returnUpdate[cluster.GetName()] = update |
| } |
| |
| v2c.parent.newCDSUpdate(returnUpdate) |
| return nil |
| } |
| |
| func validateCluster(cluster *xdspb.Cluster) (ClusterUpdate, error) { |
| emptyUpdate := ClusterUpdate{ServiceName: "", EnableLRS: false} |
| switch { |
| case cluster.GetType() != xdspb.Cluster_EDS: |
| return emptyUpdate, fmt.Errorf("xds: unexpected cluster type %v in response: %+v", cluster.GetType(), cluster) |
| case cluster.GetEdsClusterConfig().GetEdsConfig().GetAds() == nil: |
| return emptyUpdate, fmt.Errorf("xds: unexpected edsConfig in response: %+v", cluster) |
| case cluster.GetLbPolicy() != xdspb.Cluster_ROUND_ROBIN: |
| return emptyUpdate, fmt.Errorf("xds: unexpected lbPolicy %v in response: %+v", cluster.GetLbPolicy(), cluster) |
| } |
| |
| return ClusterUpdate{ |
| ServiceName: cluster.GetEdsClusterConfig().GetServiceName(), |
| EnableLRS: cluster.GetLrsServer().GetSelf() != nil, |
| }, nil |
| } |