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// Copyright 2018 The etcd 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 agent
import (
"math"
"net"
"os"
"os/exec"
"strings"
"go.etcd.io/etcd/pkg/v3/proxy"
"go.etcd.io/etcd/server/v3/embed"
"go.etcd.io/etcd/tests/v3/functional/rpcpb"
"go.uber.org/zap"
"google.golang.org/grpc"
)
// Server implements "rpcpb.TransportServer"
// and other etcd operations as an agent
// no need to lock fields since request operations are
// serialized in tester-side
type Server struct {
lg *zap.Logger
grpcServer *grpc.Server
network string
address string
ln net.Listener
rpcpb.TransportServer
last rpcpb.Operation
*rpcpb.Member
*rpcpb.Tester
etcdServer *embed.Etcd
etcdCmd *exec.Cmd
etcdLogFile *os.File
// forward incoming advertise URLs traffic to listen URLs
advertiseClientPortToProxy map[int]proxy.Server
advertisePeerPortToProxy map[int]proxy.Server
}
// NewServer returns a new agent server.
func NewServer(
lg *zap.Logger,
network string,
address string,
) *Server {
return &Server{
lg: lg,
network: network,
address: address,
last: rpcpb.Operation_NOT_STARTED,
advertiseClientPortToProxy: make(map[int]proxy.Server),
advertisePeerPortToProxy: make(map[int]proxy.Server),
}
}
const (
maxRequestBytes = 1.5 * 1024 * 1024
grpcOverheadBytes = 512 * 1024
maxStreams = math.MaxUint32
maxSendBytes = math.MaxInt32
)
// StartServe starts serving agent server.
func (srv *Server) StartServe() error {
var err error
srv.ln, err = net.Listen(srv.network, srv.address)
if err != nil {
return err
}
var opts []grpc.ServerOption
opts = append(opts, grpc.MaxRecvMsgSize(int(maxRequestBytes+grpcOverheadBytes)))
opts = append(opts, grpc.MaxSendMsgSize(maxSendBytes))
opts = append(opts, grpc.MaxConcurrentStreams(maxStreams))
srv.grpcServer = grpc.NewServer(opts...)
rpcpb.RegisterTransportServer(srv.grpcServer, srv)
srv.lg.Info(
"gRPC server started",
zap.String("address", srv.address),
zap.String("listener-address", srv.ln.Addr().String()),
)
err = srv.grpcServer.Serve(srv.ln)
if err != nil && strings.Contains(err.Error(), "use of closed network connection") {
srv.lg.Info(
"gRPC server is shut down",
zap.String("address", srv.address),
zap.Error(err),
)
} else {
srv.lg.Warn(
"gRPC server returned with error",
zap.String("address", srv.address),
zap.Error(err),
)
}
return err
}
// Stop stops serving gRPC server.
func (srv *Server) Stop() {
srv.lg.Info("gRPC server stopping", zap.String("address", srv.address))
srv.grpcServer.Stop()
srv.lg.Info("gRPC server stopped", zap.String("address", srv.address))
}
// Transport communicates with etcd tester.
func (srv *Server) Transport(stream rpcpb.Transport_TransportServer) (reterr error) {
errc := make(chan error, 1)
go func() {
for {
var req *rpcpb.Request
var err error
req, err = stream.Recv()
if err != nil {
errc <- err
// TODO: handle error and retry
return
}
if req.Member != nil {
srv.Member = req.Member
}
if req.Tester != nil {
srv.Tester = req.Tester
}
var resp *rpcpb.Response
resp, err = srv.handleTesterRequest(req)
if err != nil {
errc <- err
// TODO: handle error and retry
return
}
if err = stream.Send(resp); err != nil {
errc <- err
// TODO: handle error and retry
return
}
}
}()
select {
case reterr = <-errc:
case <-stream.Context().Done():
reterr = stream.Context().Err()
}
return reterr
}
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