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// Copyright 2020 Envoyproxy 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 example
import (
"context"
"fmt"
"log"
"net"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
clusterservice "github.com/envoyproxy/go-control-plane/envoy/service/cluster/v3"
discoverygrpc "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
endpointservice "github.com/envoyproxy/go-control-plane/envoy/service/endpoint/v3"
listenerservice "github.com/envoyproxy/go-control-plane/envoy/service/listener/v3"
routeservice "github.com/envoyproxy/go-control-plane/envoy/service/route/v3"
runtimeservice "github.com/envoyproxy/go-control-plane/envoy/service/runtime/v3"
secretservice "github.com/envoyproxy/go-control-plane/envoy/service/secret/v3"
"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
"github.com/envoyproxy/go-control-plane/pkg/server/v3"
"github.com/envoyproxy/go-control-plane/pkg/test/v3"
)
const (
grpcKeepaliveTime = 30 * time.Second
grpcKeepaliveTimeout = 5 * time.Second
grpcKeepaliveMinTime = 30 * time.Second
grpcMaxConcurrentStreams = 1000000
)
type Server struct {
xdsserver server.Server
}
func NewServer(ctx context.Context, cache cache.Cache, cb *test.Callbacks) *Server {
srv := server.NewServer(ctx, cache, cb)
return &Server{srv}
}
func (s *Server) registerServer(grpcServer *grpc.Server) {
// register services
discoverygrpc.RegisterAggregatedDiscoveryServiceServer(grpcServer, s.xdsserver)
endpointservice.RegisterEndpointDiscoveryServiceServer(grpcServer, s.xdsserver)
clusterservice.RegisterClusterDiscoveryServiceServer(grpcServer, s.xdsserver)
routeservice.RegisterRouteDiscoveryServiceServer(grpcServer, s.xdsserver)
listenerservice.RegisterListenerDiscoveryServiceServer(grpcServer, s.xdsserver)
secretservice.RegisterSecretDiscoveryServiceServer(grpcServer, s.xdsserver)
runtimeservice.RegisterRuntimeDiscoveryServiceServer(grpcServer, s.xdsserver)
}
func (s *Server) Run(port uint) {
// gRPC golang library sets a very small upper bound for the number gRPC/h2
// streams over a single TCP connection. If a proxy multiplexes requests over
// a single connection to the management server, then it might lead to
// availability problems. Keepalive timeouts based on connection_keepalive parameter https://www.envoyproxy.io/docs/envoy/latest/configuration/overview/examples#dynamic
var grpcOptions []grpc.ServerOption
grpcOptions = append(grpcOptions,
grpc.MaxConcurrentStreams(grpcMaxConcurrentStreams),
grpc.KeepaliveParams(keepalive.ServerParameters{
Time: grpcKeepaliveTime,
Timeout: grpcKeepaliveTimeout,
}),
grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
MinTime: grpcKeepaliveMinTime,
PermitWithoutStream: true,
}),
)
grpcServer := grpc.NewServer(grpcOptions...)
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
log.Fatal(err)
}
s.registerServer(grpcServer)
log.Printf("management server listening on %d\n", port)
if err = grpcServer.Serve(lis); err != nil {
log.Println(err)
}
}
func registerServer(grpcServer *grpc.Server, server server.Server) {
// register services
discoverygrpc.RegisterAggregatedDiscoveryServiceServer(grpcServer, server)
endpointservice.RegisterEndpointDiscoveryServiceServer(grpcServer, server)
clusterservice.RegisterClusterDiscoveryServiceServer(grpcServer, server)
routeservice.RegisterRouteDiscoveryServiceServer(grpcServer, server)
listenerservice.RegisterListenerDiscoveryServiceServer(grpcServer, server)
secretservice.RegisterSecretDiscoveryServiceServer(grpcServer, server)
runtimeservice.RegisterRuntimeDiscoveryServiceServer(grpcServer, server)
}
// RunServer starts an xDS server at the given port.
func RunServer(srv server.Server, port uint) {
// gRPC golang library sets a very small upper bound for the number gRPC/h2
// streams over a single TCP connection. If a proxy multiplexes requests over
// a single connection to the management server, then it might lead to
// availability problems. Keepalive timeouts based on connection_keepalive parameter https://www.envoyproxy.io/docs/envoy/latest/configuration/overview/examples#dynamic
var grpcOptions []grpc.ServerOption
grpcOptions = append(grpcOptions,
grpc.MaxConcurrentStreams(grpcMaxConcurrentStreams),
grpc.KeepaliveParams(keepalive.ServerParameters{
Time: grpcKeepaliveTime,
Timeout: grpcKeepaliveTimeout,
}),
grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
MinTime: grpcKeepaliveMinTime,
PermitWithoutStream: true,
}),
)
grpcServer := grpc.NewServer(grpcOptions...)
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
log.Fatal(err)
}
registerServer(grpcServer, srv)
log.Printf("management server listening on %d\n", port)
if err = grpcServer.Serve(lis); err != nil {
log.Println(err)
}
}
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