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cds.go
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cds.go
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// Copyright 2018 Istio 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 v2
import (
"fmt"
xdsapi "github.com/envoyproxy/go-control-plane/envoy/api/v2"
"github.com/gogo/protobuf/types"
"github.com/prometheus/client_golang/prometheus"
"istio.io/istio/pilot/pkg/model"
)
// clusters aggregate a DiscoveryResponse for pushing.
func (con *XdsConnection) clusters(response []*xdsapi.Cluster) *xdsapi.DiscoveryResponse {
out := &xdsapi.DiscoveryResponse{
// All resources for CDS ought to be of the type ClusterLoadAssignment
TypeUrl: ClusterType,
// Pilot does not really care for versioning. It always supplies what's currently
// available to it, irrespective of whether Envoy chooses to accept or reject CDS
// responses. Pilot believes in eventual consistency and that at some point, Envoy
// will begin seeing results it deems to be good.
VersionInfo: versionInfo(),
Nonce: nonce(),
}
for _, c := range response {
cc, _ := types.MarshalAny(c)
out.Resources = append(out.Resources, *cc)
}
return out
}
func (s *DiscoveryServer) pushCds(con *XdsConnection, push *model.PushContext, version string) error {
// TODO: Modify interface to take services, and config instead of making library query registry
rawClusters, err := s.generateRawClusters(con.modelNode, push)
if err != nil {
return err
}
if s.DebugConfigs {
con.CDSClusters = rawClusters
}
response := con.clusters(rawClusters)
err = con.send(response)
if err != nil {
adsLog.Warnf("CDS: Send failure, closing grpc %s: %v", con.modelNode.ID, err)
pushes.With(prometheus.Labels{"type": "cds_senderr"}).Add(1)
return err
}
pushes.With(prometheus.Labels{"type": "cds"}).Add(1)
// The response can't be easily read due to 'any' marshaling.
adsLog.Infof("CDS: PUSH %s for %s %q, Clusters: %d, Services %d", version,
con.modelNode.ID, con.PeerAddr, len(rawClusters), len(push.Services(nil)))
return nil
}
func (s *DiscoveryServer) generateRawClusters(node *model.Proxy, push *model.PushContext) ([]*xdsapi.Cluster, error) {
rawClusters, err := s.ConfigGenerator.BuildClusters(s.Env, node, push)
if err != nil {
adsLog.Warnf("CDS: Failed to generate clusters for node %s: %v", node, err)
pushes.With(prometheus.Labels{"type": "cds_builderr"}).Add(1)
return nil, err
}
for _, c := range rawClusters {
if err = c.Validate(); err != nil {
retErr := fmt.Errorf("CDS: Generated invalid cluster for node %v: %v", node, err)
adsLog.Errorf("CDS: Generated invalid cluster for node %s: %v, %v", node, err, c)
pushes.With(prometheus.Labels{"type": "cds_builderr"}).Add(1)
totalXDSInternalErrors.Add(1)
// Generating invalid clusters is a bug.
// Panic instead of trying to recover from that, since we can't
// assume anything about the state.
panic(retErr.Error())
}
}
return rawClusters, nil
}