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cli.go
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cli.go
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// Copyright © 2018 Heptio
// 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 main
import (
"context"
"os"
"github.com/envoyproxy/go-control-plane/envoy/api/v2"
"github.com/gogo/protobuf/proto"
"google.golang.org/grpc"
)
const (
googleApis = "type.googleapis.com/"
typePrefix = googleApis + "envoy.api.v2."
endpointType = typePrefix + "ClusterLoadAssignment"
clusterType = typePrefix + "Cluster"
routeType = typePrefix + "RouteConfiguration"
listenerType = typePrefix + "Listener"
)
type Client struct {
ContourAddr string
}
func (c *Client) dial() *grpc.ClientConn {
conn, err := grpc.Dial(c.ContourAddr, grpc.WithInsecure())
check(err)
return conn
}
func (c *Client) ClusterStream() v2.ClusterDiscoveryService_StreamClustersClient {
stream, err := v2.NewClusterDiscoveryServiceClient(c.dial()).StreamClusters(context.Background())
check(err)
return stream
}
func (c *Client) EndpointStream() v2.ClusterDiscoveryService_StreamClustersClient {
stream, err := v2.NewEndpointDiscoveryServiceClient(c.dial()).StreamEndpoints(context.Background())
check(err)
return stream
}
func (c *Client) ListenerStream() v2.ClusterDiscoveryService_StreamClustersClient {
stream, err := v2.NewListenerDiscoveryServiceClient(c.dial()).StreamListeners(context.Background())
check(err)
return stream
}
func (c *Client) RouteStream() v2.ClusterDiscoveryService_StreamClustersClient {
stream, err := v2.NewRouteDiscoveryServiceClient(c.dial()).StreamRoutes(context.Background())
check(err)
return stream
}
type stream interface {
Send(*v2.DiscoveryRequest) error
Recv() (*v2.DiscoveryResponse, error)
}
func watchstream(st stream, typeURL string, resources []string) {
m := proto.TextMarshaler{
Compact: false,
ExpandAny: true,
}
for {
req := &v2.DiscoveryRequest{
TypeUrl: typeURL,
ResourceNames: resources,
}
err := st.Send(req)
check(err)
resp, err := st.Recv()
check(err)
m.Marshal(os.Stdout, resp)
}
}