mirror of
https://github.com/coredns/coredns.git
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91 lines
2.9 KiB
Go
91 lines
2.9 KiB
Go
/*
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*
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* Copyright 2019 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package xds
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import (
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"fmt"
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xdspb "github.com/envoyproxy/go-control-plane/envoy/api/v2"
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"github.com/golang/protobuf/ptypes"
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)
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// handleCDSResponse processes an CDS response received from the xDS server. On
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// receipt of a good response, it also invokes the registered watcher callback.
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func (v2c *v2Client) handleCDSResponse(resp *xdspb.DiscoveryResponse) error {
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println("handlCDSResponse")
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v2c.mu.Lock()
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defer v2c.mu.Unlock()
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wi := v2c.watchMap[cdsURL]
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if wi == nil {
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return fmt.Errorf("xds: no CDS watcher found when handling CDS response: %+v", resp)
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}
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var returnUpdate CDSUpdate
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localCache := make(map[string]CDSUpdate)
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for _, r := range resp.GetResources() {
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var resource ptypes.DynamicAny
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if err := ptypes.UnmarshalAny(r, &resource); err != nil {
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return fmt.Errorf("xds: failed to unmarshal resource in CDS response: %v", err)
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}
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cluster, ok := resource.Message.(*xdspb.Cluster)
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if !ok {
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return fmt.Errorf("xds: unexpected resource type: %T in CDS response", resource.Message)
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}
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fmt.Printf("CLUSTER %+v\n", cluster)
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update, err := validateCluster(cluster)
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if err != nil {
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return err
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}
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// If the Cluster message in the CDS response did not contain a
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// serviceName, we will just use the clusterName for EDS.
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if update.ServiceName == "" {
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update.ServiceName = cluster.GetName()
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}
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localCache[cluster.GetName()] = update
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if cluster.GetName() == wi.target[0] {
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returnUpdate = update
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}
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}
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v2c.cdsCache = localCache
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var err error
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if returnUpdate.ServiceName == "" {
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err = fmt.Errorf("xds: CDS target %s not found in received response %+v", wi.target, resp)
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}
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wi.stopTimer()
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wi.callback.(cdsCallback)(returnUpdate, err)
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return nil
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}
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func validateCluster(cluster *xdspb.Cluster) (CDSUpdate, error) {
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emptyUpdate := CDSUpdate{ServiceName: ""}
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switch {
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case cluster.GetType() != xdspb.Cluster_EDS:
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return emptyUpdate, fmt.Errorf("xds: unexpected cluster type %v in response: %+v", cluster.GetType(), cluster)
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case cluster.GetEdsClusterConfig().GetEdsConfig().GetAds() == nil:
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return emptyUpdate, fmt.Errorf("xds: unexpected edsConfig in response: %+v", cluster)
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case cluster.GetLbPolicy() != xdspb.Cluster_ROUND_ROBIN:
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return emptyUpdate, fmt.Errorf("xds: unexpected lbPolicy %v in response: %+v", cluster.GetLbPolicy(), cluster)
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}
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return CDSUpdate{ServiceName: cluster.GetEdsClusterConfig().GetServiceName()}, nil
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}
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