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handler.go
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handler.go
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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 (
"errors"
"fmt"
"net/url"
"os"
"os/exec"
"syscall"
"time"
"github.com/coreos/etcd/pkg/fileutil"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/tools/functional-tester/rpcpb"
"go.uber.org/zap"
)
// return error for system errors (e.g. fail to create files)
// return status error in response for wrong configuration/operation (e.g. start etcd twice)
func (srv *Server) handleTesterRequest(req *rpcpb.Request) (resp *rpcpb.Response, err error) {
defer func() {
if err == nil {
srv.last = req.Operation
srv.lg.Info("handler success", zap.String("operation", req.Operation.String()))
}
}()
switch req.Operation {
case rpcpb.Operation_InitialStartEtcd:
return srv.handleInitialStartEtcd(req)
case rpcpb.Operation_RestartEtcd:
return srv.handleRestartEtcd()
case rpcpb.Operation_KillEtcd:
return srv.handleKillEtcd()
case rpcpb.Operation_FailArchive:
return srv.handleFailArchive()
case rpcpb.Operation_DestroyEtcdAgent:
return srv.handleDestroyEtcdAgent()
case rpcpb.Operation_BlackholePeerPortTxRx:
return srv.handleBlackholePeerPortTxRx()
case rpcpb.Operation_UnblackholePeerPortTxRx:
return srv.handleUnblackholePeerPortTxRx()
case rpcpb.Operation_DelayPeerPortTxRx:
return srv.handleDelayPeerPortTxRx()
case rpcpb.Operation_UndelayPeerPortTxRx:
return srv.handleUndelayPeerPortTxRx()
default:
msg := fmt.Sprintf("operation not found (%v)", req.Operation)
return &rpcpb.Response{Success: false, Status: msg}, errors.New(msg)
}
}
func (srv *Server) handleInitialStartEtcd(req *rpcpb.Request) (*rpcpb.Response, error) {
if srv.last != rpcpb.Operation_NotStarted {
return &rpcpb.Response{
Success: false,
Status: fmt.Sprintf("%q is not valid; last server operation was %q", rpcpb.Operation_InitialStartEtcd.String(), srv.last.String()),
}, nil
}
srv.Member = req.Member
srv.Tester = req.Tester
srv.lg.Info("creating base directory", zap.String("path", srv.Member.BaseDir))
err := fileutil.TouchDirAll(srv.Member.BaseDir)
if err != nil {
return nil, err
}
srv.lg.Info("created base directory", zap.String("path", srv.Member.BaseDir))
if err = srv.createEtcdFile(); err != nil {
return nil, err
}
srv.creatEtcdCmd()
srv.lg.Info("starting etcd")
err = srv.startEtcdCmd()
if err != nil {
return nil, err
}
srv.lg.Info("started etcd", zap.String("command-path", srv.etcdCmd.Path))
// wait some time for etcd listener start
// before setting up proxy
time.Sleep(time.Second)
if err = srv.startProxy(); err != nil {
return nil, err
}
return &rpcpb.Response{
Success: true,
Status: "successfully started etcd!",
}, nil
}
func (srv *Server) startProxy() error {
if srv.Member.EtcdClientProxy {
advertiseClientURL, advertiseClientURLPort, err := getURLAndPort(srv.Member.Etcd.AdvertiseClientURLs[0])
if err != nil {
return err
}
listenClientURL, _, err := getURLAndPort(srv.Member.Etcd.ListenClientURLs[0])
if err != nil {
return err
}
srv.lg.Info("starting proxy on client traffic", zap.String("url", advertiseClientURL.String()))
srv.advertiseClientPortToProxy[advertiseClientURLPort] = transport.NewProxy(transport.ProxyConfig{
Logger: srv.lg,
From: *advertiseClientURL,
To: *listenClientURL,
})
select {
case err = <-srv.advertiseClientPortToProxy[advertiseClientURLPort].Error():
return err
case <-time.After(2 * time.Second):
srv.lg.Info("started proxy on client traffic", zap.String("url", advertiseClientURL.String()))
}
}
if srv.Member.EtcdPeerProxy {
advertisePeerURL, advertisePeerURLPort, err := getURLAndPort(srv.Member.Etcd.InitialAdvertisePeerURLs[0])
if err != nil {
return err
}
listenPeerURL, _, err := getURLAndPort(srv.Member.Etcd.ListenPeerURLs[0])
if err != nil {
return err
}
srv.lg.Info("starting proxy on peer traffic", zap.String("url", advertisePeerURL.String()))
srv.advertisePeerPortToProxy[advertisePeerURLPort] = transport.NewProxy(transport.ProxyConfig{
Logger: srv.lg,
From: *advertisePeerURL,
To: *listenPeerURL,
})
select {
case err = <-srv.advertisePeerPortToProxy[advertisePeerURLPort].Error():
return err
case <-time.After(2 * time.Second):
srv.lg.Info("started proxy on peer traffic", zap.String("url", advertisePeerURL.String()))
}
}
return nil
}
func (srv *Server) stopProxy() {
if srv.Member.EtcdClientProxy && len(srv.advertiseClientPortToProxy) > 0 {
for port, px := range srv.advertiseClientPortToProxy {
srv.lg.Info("closing proxy",
zap.Int("port", port),
zap.String("from", px.From()),
zap.String("to", px.To()),
)
if err := px.Close(); err != nil {
srv.lg.Warn("failed to close proxy", zap.Int("port", port))
continue
}
select {
case <-px.Done():
// enough time to release port
time.Sleep(time.Second)
case <-time.After(time.Second):
}
srv.lg.Info("closed proxy",
zap.Int("port", port),
zap.String("from", px.From()),
zap.String("to", px.To()),
)
}
srv.advertiseClientPortToProxy = make(map[int]transport.Proxy)
}
if srv.Member.EtcdPeerProxy && len(srv.advertisePeerPortToProxy) > 0 {
for port, px := range srv.advertisePeerPortToProxy {
srv.lg.Info("closing proxy",
zap.Int("port", port),
zap.String("from", px.From()),
zap.String("to", px.To()),
)
if err := px.Close(); err != nil {
srv.lg.Warn("failed to close proxy", zap.Int("port", port))
continue
}
select {
case <-px.Done():
// enough time to release port
time.Sleep(time.Second)
case <-time.After(time.Second):
}
srv.lg.Info("closed proxy",
zap.Int("port", port),
zap.String("from", px.From()),
zap.String("to", px.To()),
)
}
srv.advertisePeerPortToProxy = make(map[int]transport.Proxy)
}
}
func (srv *Server) createEtcdFile() error {
srv.lg.Info("creating etcd log file", zap.String("path", srv.Member.EtcdLogPath))
var err error
srv.etcdLogFile, err = os.Create(srv.Member.EtcdLogPath)
if err != nil {
return err
}
srv.lg.Info("created etcd log file", zap.String("path", srv.Member.EtcdLogPath))
return nil
}
func (srv *Server) creatEtcdCmd() {
etcdPath, etcdFlags := srv.Member.EtcdExecPath, srv.Member.Etcd.Flags()
u, _ := url.Parse(srv.Member.FailpointHTTPAddr)
srv.lg.Info("creating etcd command",
zap.String("etcd-exec-path", etcdPath),
zap.Strings("etcd-flags", etcdFlags),
zap.String("failpoint-http-addr", srv.Member.FailpointHTTPAddr),
zap.String("failpoint-addr", u.Host),
)
srv.etcdCmd = exec.Command(etcdPath, etcdFlags...)
srv.etcdCmd.Env = []string{"GOFAIL_HTTP=" + u.Host}
srv.etcdCmd.Stdout = srv.etcdLogFile
srv.etcdCmd.Stderr = srv.etcdLogFile
}
// start but do not wait for it to complete
func (srv *Server) startEtcdCmd() error {
return srv.etcdCmd.Start()
}
func (srv *Server) handleRestartEtcd() (*rpcpb.Response, error) {
srv.creatEtcdCmd()
srv.lg.Info("restarting etcd")
err := srv.startEtcdCmd()
if err != nil {
return nil, err
}
srv.lg.Info("restarted etcd", zap.String("command-path", srv.etcdCmd.Path))
// wait some time for etcd listener start
// before setting up proxy
// TODO: local tests should handle port conflicts
// with clients on restart
time.Sleep(time.Second)
if err = srv.startProxy(); err != nil {
return nil, err
}
return &rpcpb.Response{
Success: true,
Status: "successfully restarted etcd!",
}, nil
}
func (srv *Server) handleKillEtcd() (*rpcpb.Response, error) {
srv.stopProxy()
srv.lg.Info("killing etcd", zap.String("signal", syscall.SIGTERM.String()))
err := stopWithSig(srv.etcdCmd, syscall.SIGTERM)
if err != nil {
return nil, err
}
srv.lg.Info("killed etcd", zap.String("signal", syscall.SIGTERM.String()))
return &rpcpb.Response{
Success: true,
Status: "successfully killed etcd!",
}, nil
}
func (srv *Server) handleFailArchive() (*rpcpb.Response, error) {
srv.stopProxy()
// exit with stackstrace
srv.lg.Info("killing etcd", zap.String("signal", syscall.SIGQUIT.String()))
err := stopWithSig(srv.etcdCmd, syscall.SIGQUIT)
if err != nil {
return nil, err
}
srv.lg.Info("killed etcd", zap.String("signal", syscall.SIGQUIT.String()))
srv.etcdLogFile.Sync()
srv.etcdLogFile.Close()
// TODO: support separate WAL directory
srv.lg.Info("archiving data", zap.String("base-dir", srv.Member.BaseDir))
if err = archive(
srv.Member.BaseDir,
srv.Member.EtcdLogPath,
srv.Member.Etcd.DataDir,
); err != nil {
return nil, err
}
srv.lg.Info("archived data", zap.String("base-dir", srv.Member.BaseDir))
if err = srv.createEtcdFile(); err != nil {
return nil, err
}
srv.lg.Info("cleaning up page cache")
if err := cleanPageCache(); err != nil {
srv.lg.Warn("failed to clean up page cache", zap.String("error", err.Error()))
}
srv.lg.Info("cleaned up page cache")
return &rpcpb.Response{
Success: true,
Status: "successfully cleaned up etcd!",
}, nil
}
// stop proxy, etcd, delete data directory
func (srv *Server) handleDestroyEtcdAgent() (*rpcpb.Response, error) {
srv.lg.Info("killing etcd", zap.String("signal", syscall.SIGTERM.String()))
err := stopWithSig(srv.etcdCmd, syscall.SIGTERM)
if err != nil {
return nil, err
}
srv.lg.Info("killed etcd", zap.String("signal", syscall.SIGTERM.String()))
srv.lg.Info("removing base directory", zap.String("dir", srv.Member.BaseDir))
err = os.RemoveAll(srv.Member.BaseDir)
if err != nil {
return nil, err
}
srv.lg.Info("removed base directory", zap.String("dir", srv.Member.BaseDir))
// stop agent server
srv.Stop()
for port, px := range srv.advertiseClientPortToProxy {
srv.lg.Info("closing proxy", zap.Int("client-port", port))
err := px.Close()
srv.lg.Info("closed proxy", zap.Int("client-port", port), zap.Error(err))
}
for port, px := range srv.advertisePeerPortToProxy {
srv.lg.Info("closing proxy", zap.Int("peer-port", port))
err := px.Close()
srv.lg.Info("closed proxy", zap.Int("peer-port", port), zap.Error(err))
}
return &rpcpb.Response{
Success: true,
Status: "successfully destroyed etcd and agent!",
}, nil
}
func (srv *Server) handleBlackholePeerPortTxRx() (*rpcpb.Response, error) {
for port, px := range srv.advertisePeerPortToProxy {
srv.lg.Info("blackholing", zap.Int("peer-port", port))
px.BlackholeTx()
px.BlackholeRx()
srv.lg.Info("blackholed", zap.Int("peer-port", port))
}
return &rpcpb.Response{
Success: true,
Status: "successfully blackholed peer port tx/rx!",
}, nil
}
func (srv *Server) handleUnblackholePeerPortTxRx() (*rpcpb.Response, error) {
for port, px := range srv.advertisePeerPortToProxy {
srv.lg.Info("unblackholing", zap.Int("peer-port", port))
px.UnblackholeTx()
px.UnblackholeRx()
srv.lg.Info("unblackholed", zap.Int("peer-port", port))
}
return &rpcpb.Response{
Success: true,
Status: "successfully unblackholed peer port tx/rx!",
}, nil
}
func (srv *Server) handleDelayPeerPortTxRx() (*rpcpb.Response, error) {
lat := time.Duration(srv.Tester.DelayLatencyMs) * time.Millisecond
rv := time.Duration(srv.Tester.DelayLatencyMsRv) * time.Millisecond
for port, px := range srv.advertisePeerPortToProxy {
srv.lg.Info("delaying",
zap.Int("peer-port", port),
zap.Duration("latency", lat),
zap.Duration("random-variable", rv),
)
px.DelayTx(lat, rv)
px.DelayRx(lat, rv)
srv.lg.Info("delayed",
zap.Int("peer-port", port),
zap.Duration("latency", lat),
zap.Duration("random-variable", rv),
)
}
return &rpcpb.Response{
Success: true,
Status: "successfully delay peer port tx/rx!",
}, nil
}
func (srv *Server) handleUndelayPeerPortTxRx() (*rpcpb.Response, error) {
for port, px := range srv.advertisePeerPortToProxy {
srv.lg.Info("undelaying", zap.Int("peer-port", port))
px.UndelayTx()
px.UndelayRx()
srv.lg.Info("undelayed", zap.Int("peer-port", port))
}
return &rpcpb.Response{
Success: true,
Status: "successfully undelay peer port tx/rx!",
}, nil
}