/
cluster.go
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/
cluster.go
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// Copyright Project Contour 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 v3
import (
"sort"
"sync"
envoy_cluster_v3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
resource "github.com/envoyproxy/go-control-plane/pkg/resource/v3"
"github.com/golang/protobuf/proto"
"github.com/projectcontour/contour/internal/contour"
"github.com/projectcontour/contour/internal/dag"
"github.com/projectcontour/contour/internal/envoy"
envoy_v3 "github.com/projectcontour/contour/internal/envoy/v3"
"github.com/projectcontour/contour/internal/protobuf"
"github.com/projectcontour/contour/internal/sorter"
)
// ClusterCache manages the contents of the gRPC CDS cache.
type ClusterCache struct {
mu sync.Mutex
values map[string]*envoy_cluster_v3.Cluster
contour.Cond
}
// Update replaces the contents of the cache with the supplied map.
func (c *ClusterCache) Update(v map[string]*envoy_cluster_v3.Cluster) {
c.mu.Lock()
defer c.mu.Unlock()
c.values = v
c.Cond.Notify()
}
// Contents returns a copy of the cache's contents.
func (c *ClusterCache) Contents() []proto.Message {
c.mu.Lock()
defer c.mu.Unlock()
var values []*envoy_cluster_v3.Cluster
for _, v := range c.values {
values = append(values, v)
}
sort.Stable(sorter.For(values))
return protobuf.AsMessages(values)
}
func (c *ClusterCache) Query(names []string) []proto.Message {
c.mu.Lock()
defer c.mu.Unlock()
var values []*envoy_cluster_v3.Cluster
for _, n := range names {
// if the cluster is not registered we cannot return
// a blank cluster because each cluster has a required
// discovery type; DNS, EDS, etc. We cannot determine the
// correct value for this property from the cluster's name
// provided by the query so we must not return a blank cluster.
if v, ok := c.values[n]; ok {
values = append(values, v)
}
}
sort.Stable(sorter.For(values))
return protobuf.AsMessages(values)
}
func (*ClusterCache) TypeURL() string { return resource.ClusterType }
func (c *ClusterCache) OnChange(root *dag.DAG) {
clusters := visitClusters(root)
c.Update(clusters)
}
type clusterVisitor struct {
clusters map[string]*envoy_cluster_v3.Cluster
}
// visitCluster produces a map of *envoy_cluster_v3.Clusters.
func visitClusters(root dag.Vertex) map[string]*envoy_cluster_v3.Cluster {
cv := clusterVisitor{
clusters: make(map[string]*envoy_cluster_v3.Cluster),
}
cv.visit(root)
return cv.clusters
}
func (v *clusterVisitor) visit(vertex dag.Vertex) {
switch cluster := vertex.(type) {
case *dag.Cluster:
name := envoy.Clustername(cluster)
if _, ok := v.clusters[name]; !ok {
v.clusters[name] = envoy_v3.Cluster(cluster)
}
case *dag.ExtensionCluster:
name := cluster.Name
if _, ok := v.clusters[name]; !ok {
v.clusters[name] = envoy_v3.ExtensionCluster(cluster)
}
}
// recurse into children of v
vertex.Visit(v.visit)
}