mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
1003 lines
20 KiB
Go
1003 lines
20 KiB
Go
// 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 proxy
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
mrand "math/rand"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"go.etcd.io/etcd/client/pkg/v3/transport"
|
|
|
|
humanize "github.com/dustin/go-humanize"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
var (
|
|
defaultDialTimeout = 3 * time.Second
|
|
defaultBufferSize = 48 * 1024
|
|
defaultRetryInterval = 10 * time.Millisecond
|
|
defaultLogger *zap.Logger
|
|
)
|
|
|
|
func init() {
|
|
var err error
|
|
defaultLogger, err = zap.NewProduction()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
|
|
// Server defines proxy server layer that simulates common network faults:
|
|
// latency spikes and packet drop or corruption. The proxy overhead is very
|
|
// small overhead (<500μs per request). Please run tests to compute actual
|
|
// overhead.
|
|
type Server interface {
|
|
// From returns proxy source address in "scheme://host:port" format.
|
|
From() string
|
|
// To returns proxy destination address in "scheme://host:port" format.
|
|
To() string
|
|
|
|
// Ready returns when proxy is ready to serve.
|
|
Ready() <-chan struct{}
|
|
// Done returns when proxy has been closed.
|
|
Done() <-chan struct{}
|
|
// Error sends errors while serving proxy.
|
|
Error() <-chan error
|
|
// Close closes listener and transport.
|
|
Close() error
|
|
|
|
// PauseAccept stops accepting new connections.
|
|
PauseAccept()
|
|
// UnpauseAccept removes pause operation on accepting new connections.
|
|
UnpauseAccept()
|
|
|
|
// DelayAccept adds latency ± random variable to accepting
|
|
// new incoming connections.
|
|
DelayAccept(latency, rv time.Duration)
|
|
// UndelayAccept removes sending latencies.
|
|
UndelayAccept()
|
|
// LatencyAccept returns current latency on accepting
|
|
// new incoming connections.
|
|
LatencyAccept() time.Duration
|
|
|
|
// DelayTx adds latency ± random variable for "outgoing" traffic
|
|
// in "sending" layer.
|
|
DelayTx(latency, rv time.Duration)
|
|
// UndelayTx removes sending latencies.
|
|
UndelayTx()
|
|
// LatencyTx returns current send latency.
|
|
LatencyTx() time.Duration
|
|
|
|
// DelayRx adds latency ± random variable for "incoming" traffic
|
|
// in "receiving" layer.
|
|
DelayRx(latency, rv time.Duration)
|
|
// UndelayRx removes "receiving" latencies.
|
|
UndelayRx()
|
|
// LatencyRx returns current receive latency.
|
|
LatencyRx() time.Duration
|
|
|
|
// ModifyTx alters/corrupts/drops "outgoing" packets from the listener
|
|
// with the given edit function.
|
|
ModifyTx(f func(data []byte) []byte)
|
|
// UnmodifyTx removes modify operation on "forwarding".
|
|
UnmodifyTx()
|
|
|
|
// ModifyRx alters/corrupts/drops "incoming" packets to client
|
|
// with the given edit function.
|
|
ModifyRx(f func(data []byte) []byte)
|
|
// UnmodifyRx removes modify operation on "receiving".
|
|
UnmodifyRx()
|
|
|
|
// BlackholeTx drops all "outgoing" packets before "forwarding".
|
|
// "BlackholeTx" operation is a wrapper around "ModifyTx" with
|
|
// a function that returns empty bytes.
|
|
BlackholeTx()
|
|
// UnblackholeTx removes blackhole operation on "sending".
|
|
UnblackholeTx()
|
|
|
|
// BlackholeRx drops all "incoming" packets to client.
|
|
// "BlackholeRx" operation is a wrapper around "ModifyRx" with
|
|
// a function that returns empty bytes.
|
|
BlackholeRx()
|
|
// UnblackholeRx removes blackhole operation on "receiving".
|
|
UnblackholeRx()
|
|
|
|
// PauseTx stops "forwarding" packets; "outgoing" traffic blocks.
|
|
PauseTx()
|
|
// UnpauseTx removes "forwarding" pause operation.
|
|
UnpauseTx()
|
|
|
|
// PauseRx stops "receiving" packets; "incoming" traffic blocks.
|
|
PauseRx()
|
|
// UnpauseRx removes "receiving" pause operation.
|
|
UnpauseRx()
|
|
|
|
// ResetListener closes and restarts listener.
|
|
ResetListener() error
|
|
}
|
|
|
|
// ServerConfig defines proxy server configuration.
|
|
type ServerConfig struct {
|
|
Logger *zap.Logger
|
|
From url.URL
|
|
To url.URL
|
|
TLSInfo transport.TLSInfo
|
|
DialTimeout time.Duration
|
|
BufferSize int
|
|
RetryInterval time.Duration
|
|
}
|
|
|
|
type server struct {
|
|
lg *zap.Logger
|
|
|
|
from url.URL
|
|
fromPort int
|
|
to url.URL
|
|
toPort int
|
|
|
|
tlsInfo transport.TLSInfo
|
|
dialTimeout time.Duration
|
|
|
|
bufferSize int
|
|
retryInterval time.Duration
|
|
|
|
readyc chan struct{}
|
|
donec chan struct{}
|
|
errc chan error
|
|
|
|
closeOnce sync.Once
|
|
closeWg sync.WaitGroup
|
|
|
|
listenerMu sync.RWMutex
|
|
listener net.Listener
|
|
|
|
pauseAcceptMu sync.Mutex
|
|
pauseAcceptc chan struct{}
|
|
|
|
latencyAcceptMu sync.RWMutex
|
|
latencyAccept time.Duration
|
|
|
|
modifyTxMu sync.RWMutex
|
|
modifyTx func(data []byte) []byte
|
|
|
|
modifyRxMu sync.RWMutex
|
|
modifyRx func(data []byte) []byte
|
|
|
|
pauseTxMu sync.Mutex
|
|
pauseTxc chan struct{}
|
|
|
|
pauseRxMu sync.Mutex
|
|
pauseRxc chan struct{}
|
|
|
|
latencyTxMu sync.RWMutex
|
|
latencyTx time.Duration
|
|
|
|
latencyRxMu sync.RWMutex
|
|
latencyRx time.Duration
|
|
}
|
|
|
|
// NewServer returns a proxy implementation with no iptables/tc dependencies.
|
|
// The proxy layer overhead is <1ms.
|
|
func NewServer(cfg ServerConfig) Server {
|
|
s := &server{
|
|
lg: cfg.Logger,
|
|
|
|
from: cfg.From,
|
|
to: cfg.To,
|
|
|
|
tlsInfo: cfg.TLSInfo,
|
|
dialTimeout: cfg.DialTimeout,
|
|
|
|
bufferSize: cfg.BufferSize,
|
|
retryInterval: cfg.RetryInterval,
|
|
|
|
readyc: make(chan struct{}),
|
|
donec: make(chan struct{}),
|
|
errc: make(chan error, 16),
|
|
|
|
pauseAcceptc: make(chan struct{}),
|
|
pauseTxc: make(chan struct{}),
|
|
pauseRxc: make(chan struct{}),
|
|
}
|
|
|
|
_, fromPort, err := net.SplitHostPort(cfg.From.Host)
|
|
if err == nil {
|
|
s.fromPort, _ = strconv.Atoi(fromPort)
|
|
}
|
|
var toPort string
|
|
_, toPort, err = net.SplitHostPort(cfg.To.Host)
|
|
if err == nil {
|
|
s.toPort, _ = strconv.Atoi(toPort)
|
|
}
|
|
|
|
if s.dialTimeout == 0 {
|
|
s.dialTimeout = defaultDialTimeout
|
|
}
|
|
if s.bufferSize == 0 {
|
|
s.bufferSize = defaultBufferSize
|
|
}
|
|
if s.retryInterval == 0 {
|
|
s.retryInterval = defaultRetryInterval
|
|
}
|
|
if s.lg == nil {
|
|
s.lg = defaultLogger
|
|
}
|
|
|
|
close(s.pauseAcceptc)
|
|
close(s.pauseTxc)
|
|
close(s.pauseRxc)
|
|
|
|
if strings.HasPrefix(s.from.Scheme, "http") {
|
|
s.from.Scheme = "tcp"
|
|
}
|
|
if strings.HasPrefix(s.to.Scheme, "http") {
|
|
s.to.Scheme = "tcp"
|
|
}
|
|
|
|
addr := fmt.Sprintf(":%d", s.fromPort)
|
|
if s.fromPort == 0 { // unix
|
|
addr = s.from.Host
|
|
}
|
|
|
|
var ln net.Listener
|
|
if !s.tlsInfo.Empty() {
|
|
ln, err = transport.NewListener(addr, s.from.Scheme, &s.tlsInfo)
|
|
} else {
|
|
ln, err = net.Listen(s.from.Scheme, addr)
|
|
}
|
|
if err != nil {
|
|
s.errc <- err
|
|
s.Close()
|
|
return s
|
|
}
|
|
s.listener = ln
|
|
|
|
s.closeWg.Add(1)
|
|
go s.listenAndServe()
|
|
|
|
s.lg.Info("started proxying", zap.String("from", s.From()), zap.String("to", s.To()))
|
|
return s
|
|
}
|
|
|
|
func (s *server) From() string {
|
|
return fmt.Sprintf("%s://%s", s.from.Scheme, s.from.Host)
|
|
}
|
|
|
|
func (s *server) To() string {
|
|
return fmt.Sprintf("%s://%s", s.to.Scheme, s.to.Host)
|
|
}
|
|
|
|
// TODO: implement packet reordering from multiple TCP connections
|
|
// buffer packets per connection for awhile, reorder before transmit
|
|
// - https://github.com/etcd-io/etcd/issues/5614
|
|
// - https://github.com/etcd-io/etcd/pull/6918#issuecomment-264093034
|
|
|
|
func (s *server) listenAndServe() {
|
|
defer s.closeWg.Done()
|
|
|
|
ctx := context.Background()
|
|
s.lg.Info("proxy is listening on", zap.String("from", s.From()))
|
|
close(s.readyc)
|
|
|
|
for {
|
|
s.pauseAcceptMu.Lock()
|
|
pausec := s.pauseAcceptc
|
|
s.pauseAcceptMu.Unlock()
|
|
select {
|
|
case <-pausec:
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
|
|
s.latencyAcceptMu.RLock()
|
|
lat := s.latencyAccept
|
|
s.latencyAcceptMu.RUnlock()
|
|
if lat > 0 {
|
|
select {
|
|
case <-time.After(lat):
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
}
|
|
|
|
s.listenerMu.RLock()
|
|
ln := s.listener
|
|
s.listenerMu.RUnlock()
|
|
|
|
in, err := ln.Accept()
|
|
if err != nil {
|
|
select {
|
|
case s.errc <- err:
|
|
select {
|
|
case <-s.donec:
|
|
return
|
|
default:
|
|
}
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
s.lg.Debug("listener accept error", zap.Error(err))
|
|
|
|
if strings.HasSuffix(err.Error(), "use of closed network connection") {
|
|
select {
|
|
case <-time.After(s.retryInterval):
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
s.lg.Debug("listener is closed; retry listening on", zap.String("from", s.From()))
|
|
|
|
if err = s.ResetListener(); err != nil {
|
|
select {
|
|
case s.errc <- err:
|
|
select {
|
|
case <-s.donec:
|
|
return
|
|
default:
|
|
}
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
s.lg.Warn("failed to reset listener", zap.Error(err))
|
|
}
|
|
}
|
|
|
|
continue
|
|
}
|
|
|
|
var out net.Conn
|
|
if !s.tlsInfo.Empty() {
|
|
var tp *http.Transport
|
|
tp, err = transport.NewTransport(s.tlsInfo, s.dialTimeout)
|
|
if err != nil {
|
|
select {
|
|
case s.errc <- err:
|
|
select {
|
|
case <-s.donec:
|
|
return
|
|
default:
|
|
}
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
continue
|
|
}
|
|
out, err = tp.DialContext(ctx, s.to.Scheme, s.to.Host)
|
|
} else {
|
|
out, err = net.Dial(s.to.Scheme, s.to.Host)
|
|
}
|
|
if err != nil {
|
|
select {
|
|
case s.errc <- err:
|
|
select {
|
|
case <-s.donec:
|
|
return
|
|
default:
|
|
}
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
s.lg.Debug("failed to dial", zap.Error(err))
|
|
continue
|
|
}
|
|
|
|
s.closeWg.Add(2)
|
|
go func() {
|
|
defer s.closeWg.Done()
|
|
// read incoming bytes from listener, dispatch to outgoing connection
|
|
s.transmit(out, in)
|
|
out.Close()
|
|
in.Close()
|
|
}()
|
|
go func() {
|
|
defer s.closeWg.Done()
|
|
// read response from outgoing connection, write back to listener
|
|
s.receive(in, out)
|
|
in.Close()
|
|
out.Close()
|
|
}()
|
|
}
|
|
}
|
|
|
|
func (s *server) transmit(dst io.Writer, src io.Reader) {
|
|
s.ioCopy(dst, src, proxyTx)
|
|
}
|
|
|
|
func (s *server) receive(dst io.Writer, src io.Reader) {
|
|
s.ioCopy(dst, src, proxyRx)
|
|
}
|
|
|
|
type proxyType uint8
|
|
|
|
const (
|
|
proxyTx proxyType = iota
|
|
proxyRx
|
|
)
|
|
|
|
func (s *server) ioCopy(dst io.Writer, src io.Reader, ptype proxyType) {
|
|
buf := make([]byte, s.bufferSize)
|
|
for {
|
|
nr1, err := src.Read(buf)
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
return
|
|
}
|
|
// connection already closed
|
|
if strings.HasSuffix(err.Error(), "read: connection reset by peer") {
|
|
return
|
|
}
|
|
if strings.HasSuffix(err.Error(), "use of closed network connection") {
|
|
return
|
|
}
|
|
select {
|
|
case s.errc <- err:
|
|
select {
|
|
case <-s.donec:
|
|
return
|
|
default:
|
|
}
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
s.lg.Debug("failed to read", zap.Error(err))
|
|
return
|
|
}
|
|
if nr1 == 0 {
|
|
return
|
|
}
|
|
data := buf[:nr1]
|
|
|
|
// alters/corrupts/drops data
|
|
switch ptype {
|
|
case proxyTx:
|
|
s.modifyTxMu.RLock()
|
|
if s.modifyTx != nil {
|
|
data = s.modifyTx(data)
|
|
}
|
|
s.modifyTxMu.RUnlock()
|
|
case proxyRx:
|
|
s.modifyRxMu.RLock()
|
|
if s.modifyRx != nil {
|
|
data = s.modifyRx(data)
|
|
}
|
|
s.modifyRxMu.RUnlock()
|
|
default:
|
|
panic("unknown proxy type")
|
|
}
|
|
nr2 := len(data)
|
|
switch ptype {
|
|
case proxyTx:
|
|
s.lg.Debug(
|
|
"modified tx",
|
|
zap.String("data-received", humanize.Bytes(uint64(nr1))),
|
|
zap.String("data-modified", humanize.Bytes(uint64(nr2))),
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
case proxyRx:
|
|
s.lg.Debug(
|
|
"modified rx",
|
|
zap.String("data-received", humanize.Bytes(uint64(nr1))),
|
|
zap.String("data-modified", humanize.Bytes(uint64(nr2))),
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
default:
|
|
panic("unknown proxy type")
|
|
}
|
|
|
|
// pause before packet dropping, blocking, and forwarding
|
|
var pausec chan struct{}
|
|
switch ptype {
|
|
case proxyTx:
|
|
s.pauseTxMu.Lock()
|
|
pausec = s.pauseTxc
|
|
s.pauseTxMu.Unlock()
|
|
case proxyRx:
|
|
s.pauseRxMu.Lock()
|
|
pausec = s.pauseRxc
|
|
s.pauseRxMu.Unlock()
|
|
default:
|
|
panic("unknown proxy type")
|
|
}
|
|
select {
|
|
case <-pausec:
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
|
|
// pause first, and then drop packets
|
|
if nr2 == 0 {
|
|
continue
|
|
}
|
|
|
|
// block before forwarding
|
|
var lat time.Duration
|
|
switch ptype {
|
|
case proxyTx:
|
|
s.latencyTxMu.RLock()
|
|
lat = s.latencyTx
|
|
s.latencyTxMu.RUnlock()
|
|
case proxyRx:
|
|
s.latencyRxMu.RLock()
|
|
lat = s.latencyRx
|
|
s.latencyRxMu.RUnlock()
|
|
default:
|
|
panic("unknown proxy type")
|
|
}
|
|
if lat > 0 {
|
|
select {
|
|
case <-time.After(lat):
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
}
|
|
|
|
// now forward packets to target
|
|
var nw int
|
|
nw, err = dst.Write(data)
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
return
|
|
}
|
|
select {
|
|
case s.errc <- err:
|
|
select {
|
|
case <-s.donec:
|
|
return
|
|
default:
|
|
}
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
switch ptype {
|
|
case proxyTx:
|
|
s.lg.Debug("write fail on tx", zap.Error(err))
|
|
case proxyRx:
|
|
s.lg.Debug("write fail on rx", zap.Error(err))
|
|
default:
|
|
panic("unknown proxy type")
|
|
}
|
|
return
|
|
}
|
|
|
|
if nr2 != nw {
|
|
select {
|
|
case s.errc <- io.ErrShortWrite:
|
|
select {
|
|
case <-s.donec:
|
|
return
|
|
default:
|
|
}
|
|
case <-s.donec:
|
|
return
|
|
}
|
|
switch ptype {
|
|
case proxyTx:
|
|
s.lg.Debug(
|
|
"write fail on tx; read/write bytes are different",
|
|
zap.Int("read-bytes", nr1),
|
|
zap.Int("write-bytes", nw),
|
|
zap.Error(io.ErrShortWrite),
|
|
)
|
|
case proxyRx:
|
|
s.lg.Debug(
|
|
"write fail on rx; read/write bytes are different",
|
|
zap.Int("read-bytes", nr1),
|
|
zap.Int("write-bytes", nw),
|
|
zap.Error(io.ErrShortWrite),
|
|
)
|
|
default:
|
|
panic("unknown proxy type")
|
|
}
|
|
return
|
|
}
|
|
|
|
switch ptype {
|
|
case proxyTx:
|
|
s.lg.Debug(
|
|
"transmitted",
|
|
zap.String("data-size", humanize.Bytes(uint64(nr1))),
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
case proxyRx:
|
|
s.lg.Debug(
|
|
"received",
|
|
zap.String("data-size", humanize.Bytes(uint64(nr1))),
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
default:
|
|
panic("unknown proxy type")
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *server) Ready() <-chan struct{} { return s.readyc }
|
|
func (s *server) Done() <-chan struct{} { return s.donec }
|
|
func (s *server) Error() <-chan error { return s.errc }
|
|
func (s *server) Close() (err error) {
|
|
s.closeOnce.Do(func() {
|
|
close(s.donec)
|
|
s.listenerMu.Lock()
|
|
if s.listener != nil {
|
|
err = s.listener.Close()
|
|
s.lg.Info(
|
|
"closed proxy listener",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
s.lg.Sync()
|
|
s.listenerMu.Unlock()
|
|
})
|
|
s.closeWg.Wait()
|
|
return err
|
|
}
|
|
|
|
func (s *server) PauseAccept() {
|
|
s.pauseAcceptMu.Lock()
|
|
s.pauseAcceptc = make(chan struct{})
|
|
s.pauseAcceptMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"paused accept",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UnpauseAccept() {
|
|
s.pauseAcceptMu.Lock()
|
|
select {
|
|
case <-s.pauseAcceptc: // already unpaused
|
|
case <-s.donec:
|
|
s.pauseAcceptMu.Unlock()
|
|
return
|
|
default:
|
|
close(s.pauseAcceptc)
|
|
}
|
|
s.pauseAcceptMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"unpaused accept",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) DelayAccept(latency, rv time.Duration) {
|
|
if latency <= 0 {
|
|
return
|
|
}
|
|
d := computeLatency(latency, rv)
|
|
s.latencyAcceptMu.Lock()
|
|
s.latencyAccept = d
|
|
s.latencyAcceptMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"set accept latency",
|
|
zap.Duration("latency", d),
|
|
zap.Duration("given-latency", latency),
|
|
zap.Duration("given-latency-random-variable", rv),
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UndelayAccept() {
|
|
s.latencyAcceptMu.Lock()
|
|
d := s.latencyAccept
|
|
s.latencyAccept = 0
|
|
s.latencyAcceptMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"removed accept latency",
|
|
zap.Duration("latency", d),
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) LatencyAccept() time.Duration {
|
|
s.latencyAcceptMu.RLock()
|
|
d := s.latencyAccept
|
|
s.latencyAcceptMu.RUnlock()
|
|
return d
|
|
}
|
|
|
|
func (s *server) DelayTx(latency, rv time.Duration) {
|
|
if latency <= 0 {
|
|
return
|
|
}
|
|
d := computeLatency(latency, rv)
|
|
s.latencyTxMu.Lock()
|
|
s.latencyTx = d
|
|
s.latencyTxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"set transmit latency",
|
|
zap.Duration("latency", d),
|
|
zap.Duration("given-latency", latency),
|
|
zap.Duration("given-latency-random-variable", rv),
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UndelayTx() {
|
|
s.latencyTxMu.Lock()
|
|
d := s.latencyTx
|
|
s.latencyTx = 0
|
|
s.latencyTxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"removed transmit latency",
|
|
zap.Duration("latency", d),
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) LatencyTx() time.Duration {
|
|
s.latencyTxMu.RLock()
|
|
d := s.latencyTx
|
|
s.latencyTxMu.RUnlock()
|
|
return d
|
|
}
|
|
|
|
func (s *server) DelayRx(latency, rv time.Duration) {
|
|
if latency <= 0 {
|
|
return
|
|
}
|
|
d := computeLatency(latency, rv)
|
|
s.latencyRxMu.Lock()
|
|
s.latencyRx = d
|
|
s.latencyRxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"set receive latency",
|
|
zap.Duration("latency", d),
|
|
zap.Duration("given-latency", latency),
|
|
zap.Duration("given-latency-random-variable", rv),
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UndelayRx() {
|
|
s.latencyRxMu.Lock()
|
|
d := s.latencyRx
|
|
s.latencyRx = 0
|
|
s.latencyRxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"removed receive latency",
|
|
zap.Duration("latency", d),
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) LatencyRx() time.Duration {
|
|
s.latencyRxMu.RLock()
|
|
d := s.latencyRx
|
|
s.latencyRxMu.RUnlock()
|
|
return d
|
|
}
|
|
|
|
func computeLatency(lat, rv time.Duration) time.Duration {
|
|
if rv == 0 {
|
|
return lat
|
|
}
|
|
if rv < 0 {
|
|
rv *= -1
|
|
}
|
|
if rv > lat {
|
|
rv = lat / 10
|
|
}
|
|
now := time.Now()
|
|
mrand.Seed(int64(now.Nanosecond()))
|
|
sign := 1
|
|
if now.Second()%2 == 0 {
|
|
sign = -1
|
|
}
|
|
return lat + time.Duration(int64(sign)*mrand.Int63n(rv.Nanoseconds()))
|
|
}
|
|
|
|
func (s *server) ModifyTx(f func([]byte) []byte) {
|
|
s.modifyTxMu.Lock()
|
|
s.modifyTx = f
|
|
s.modifyTxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"modifying tx",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UnmodifyTx() {
|
|
s.modifyTxMu.Lock()
|
|
s.modifyTx = nil
|
|
s.modifyTxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"unmodifyed tx",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) ModifyRx(f func([]byte) []byte) {
|
|
s.modifyRxMu.Lock()
|
|
s.modifyRx = f
|
|
s.modifyRxMu.Unlock()
|
|
s.lg.Info(
|
|
"modifying rx",
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UnmodifyRx() {
|
|
s.modifyRxMu.Lock()
|
|
s.modifyRx = nil
|
|
s.modifyRxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"unmodifyed rx",
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) BlackholeTx() {
|
|
s.ModifyTx(func([]byte) []byte { return nil })
|
|
s.lg.Info(
|
|
"blackholed tx",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UnblackholeTx() {
|
|
s.UnmodifyTx()
|
|
s.lg.Info(
|
|
"unblackholed tx",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) BlackholeRx() {
|
|
s.ModifyRx(func([]byte) []byte { return nil })
|
|
s.lg.Info(
|
|
"blackholed rx",
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UnblackholeRx() {
|
|
s.UnmodifyRx()
|
|
s.lg.Info(
|
|
"unblackholed rx",
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) PauseTx() {
|
|
s.pauseTxMu.Lock()
|
|
s.pauseTxc = make(chan struct{})
|
|
s.pauseTxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"paused tx",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UnpauseTx() {
|
|
s.pauseTxMu.Lock()
|
|
select {
|
|
case <-s.pauseTxc: // already unpaused
|
|
case <-s.donec:
|
|
s.pauseTxMu.Unlock()
|
|
return
|
|
default:
|
|
close(s.pauseTxc)
|
|
}
|
|
s.pauseTxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"unpaused tx",
|
|
zap.String("from", s.From()),
|
|
zap.String("to", s.To()),
|
|
)
|
|
}
|
|
|
|
func (s *server) PauseRx() {
|
|
s.pauseRxMu.Lock()
|
|
s.pauseRxc = make(chan struct{})
|
|
s.pauseRxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"paused rx",
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) UnpauseRx() {
|
|
s.pauseRxMu.Lock()
|
|
select {
|
|
case <-s.pauseRxc: // already unpaused
|
|
case <-s.donec:
|
|
s.pauseRxMu.Unlock()
|
|
return
|
|
default:
|
|
close(s.pauseRxc)
|
|
}
|
|
s.pauseRxMu.Unlock()
|
|
|
|
s.lg.Info(
|
|
"unpaused rx",
|
|
zap.String("from", s.To()),
|
|
zap.String("to", s.From()),
|
|
)
|
|
}
|
|
|
|
func (s *server) ResetListener() error {
|
|
s.listenerMu.Lock()
|
|
defer s.listenerMu.Unlock()
|
|
|
|
if err := s.listener.Close(); err != nil {
|
|
// already closed
|
|
if !strings.HasSuffix(err.Error(), "use of closed network connection") {
|
|
return err
|
|
}
|
|
}
|
|
|
|
var ln net.Listener
|
|
var err error
|
|
if !s.tlsInfo.Empty() {
|
|
ln, err = transport.NewListener(s.from.Host, s.from.Scheme, &s.tlsInfo)
|
|
} else {
|
|
ln, err = net.Listen(s.from.Scheme, s.from.Host)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
s.listener = ln
|
|
|
|
s.lg.Info(
|
|
"reset listener on",
|
|
zap.String("from", s.From()),
|
|
)
|
|
return nil
|
|
}
|