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server.go
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server.go
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// Copyright 2020 Authors of Cilium
//
// 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 relay
import (
"fmt"
"net"
observerpb "github.com/cilium/cilium/api/v1/observer"
v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
"github.com/cilium/cilium/pkg/hubble/peer"
"github.com/cilium/cilium/pkg/hubble/relay/relayoption"
"github.com/cilium/cilium/pkg/lock"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
"google.golang.org/grpc/health"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
"google.golang.org/grpc/reflection"
)
type hubblePeer struct {
peer.Peer
conn *grpc.ClientConn
connErr error
}
// Server is a proxy that connects to a running instance of hubble gRPC server
// via unix domain socket.
type Server struct {
server *grpc.Server
log logrus.FieldLogger
peers map[string]*hubblePeer
opts relayoption.Options
mu lock.Mutex
stop chan struct{}
}
// NewServer creates a new hubble-relay Server.
func NewServer(options ...relayoption.Option) (*Server, error) {
opts := relayoption.Default
for _, opt := range options {
if err := opt(&opts); err != nil {
return nil, fmt.Errorf("failed to apply option: %v", err)
}
}
logger := logging.DefaultLogger.WithField(logfields.LogSubsys, "hubble-relay")
logging.ConfigureLogLevel(opts.Debug)
return &Server{
log: logger,
peers: make(map[string]*hubblePeer),
stop: make(chan struct{}),
opts: opts,
}, nil
}
// Serve starts the hubble-relay server. Serve does not return unless a
// listening fails with fatal errors. Serve will return a non-nil error if
// Stop() is not called.
func (s *Server) Serve() error {
s.log.WithField("options", fmt.Sprintf("%+v", s.opts)).Info("Starting server...")
s.server = grpc.NewServer()
healthSrv := health.NewServer()
healthSrv.SetServingStatus(v1.ObserverServiceName, healthpb.HealthCheckResponse_SERVING)
healthpb.RegisterHealthServer(s.server, healthSrv)
observerpb.RegisterObserverServer(s.server, s)
socket, err := net.Listen("tcp", s.opts.ListenAddress)
if err != nil {
return fmt.Errorf("failed to listen on tcp socket %s: %v", s.opts.ListenAddress, err)
}
go s.syncPeers()
reflection.Register(s.server)
return s.server.Serve(socket)
}
// Stop terminates the hubble-relay server.
func (s *Server) Stop() {
s.log.Info("Stopping server...")
close(s.stop)
s.server.Stop()
s.log.Info("Server stopped")
}