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server.go
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server.go
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// Copyright 2020 Authors of Hubble
// 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 server
import (
"crypto/tls"
"errors"
"fmt"
"net"
observerpb "github.com/cilium/cilium/api/v1/observer"
peerpb "github.com/cilium/cilium/api/v1/peer"
"github.com/cilium/cilium/pkg/hubble/server/serveroption"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
"google.golang.org/grpc/reflection"
)
var (
errNoListener = errors.New("no listener configured")
errNoServerTLSConfig = errors.New("no server TLS config is set")
)
// Server is hubble's gRPC server.
type Server struct {
log logrus.FieldLogger
srv *grpc.Server
opts serveroption.Options
}
// NewServer creates a new hubble gRPC server.
func NewServer(log logrus.FieldLogger, options ...serveroption.Option) (*Server, error) {
opts := serveroption.Options{}
for _, opt := range options {
if err := opt(&opts); err != nil {
return nil, fmt.Errorf("failed to apply option: %v", err)
}
}
if opts.Listener == nil {
return nil, errNoListener
}
if opts.ServerTLSConfig == nil && !opts.Insecure {
return nil, errNoServerTLSConfig
}
return &Server{log: log, opts: opts}, nil
}
func (s *Server) newGRPCServer() (*grpc.Server, error) {
switch {
case s.opts.Insecure:
return grpc.NewServer(), nil
case s.opts.ServerTLSConfig != nil:
tlsConfig := s.opts.ServerTLSConfig.ServerConfig(&tls.Config{
MinVersion: tls.VersionTLS13,
})
creds := credentials.NewTLS(tlsConfig)
return grpc.NewServer(grpc.Creds(creds)), nil
default:
return nil, errNoServerTLSConfig
}
}
func (s *Server) initGRPCServer() error {
srv, err := s.newGRPCServer()
if err != nil {
return err
}
if s.opts.HealthService != nil {
healthpb.RegisterHealthServer(srv, s.opts.HealthService)
}
if s.opts.ObserverService != nil {
observerpb.RegisterObserverServer(srv, s.opts.ObserverService)
}
if s.opts.PeerService != nil {
peerpb.RegisterPeerServer(srv, s.opts.PeerService)
}
s.srv = srv
reflection.Register(s.srv)
return nil
}
// Serve starts the hubble server and accepts new connections on the configured
// listener. Stop should be called to stop the server.
func (s *Server) Serve() error {
if err := s.initGRPCServer(); err != nil {
return err
}
if s.opts.Listener == nil {
return errNoListener
}
go func(listener net.Listener) {
if err := s.srv.Serve(s.opts.Listener); err != nil {
s.log.WithError(err).WithField("address", listener.Addr().String()).Error("Failed to start gRPC server")
}
}(s.opts.Listener)
return nil
}
// Stop stops the hubble server.
func (s *Server) Stop() {
s.srv.Stop()
}