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attack.go
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attack.go
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package vegeta
import (
"crypto/tls"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"strings"
"sync"
"time"
)
// Attacker is an attack executor which wraps an http.Client
type Attacker struct {
dialer *net.Dialer
client http.Client
stopch chan struct{}
workers uint64
redirects int
}
const (
// DefaultRedirects is the default number of times an Attacker follows
// redirects.
DefaultRedirects = 10
// DefaultTimeout is the default amount of time an Attacker waits for a request
// before it times out.
DefaultTimeout = 30 * time.Second
// DefaultConnections is the default amount of max open idle connections per
// target host.
DefaultConnections = 10000
// DefaultWorkers is the default initial number of workers used to carry an attack.
DefaultWorkers = 10
// NoFollow is the value when redirects are not followed but marked successful
NoFollow = -1
)
var (
// DefaultLocalAddr is the default local IP address an Attacker uses.
DefaultLocalAddr = net.IPAddr{IP: net.IPv4zero}
// DefaultTLSConfig is the default tls.Config an Attacker uses.
DefaultTLSConfig = &tls.Config{InsecureSkipVerify: true}
)
// NewAttacker returns a new Attacker with default options which are overridden
// by the optionally provided opts.
func NewAttacker(opts ...func(*Attacker)) *Attacker {
a := &Attacker{stopch: make(chan struct{}), workers: DefaultWorkers}
a.dialer = &net.Dialer{
LocalAddr: &net.TCPAddr{IP: DefaultLocalAddr.IP, Zone: DefaultLocalAddr.Zone},
KeepAlive: 30 * time.Second,
Timeout: DefaultTimeout,
}
a.client = http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: a.dialer.Dial,
ResponseHeaderTimeout: DefaultTimeout,
TLSClientConfig: DefaultTLSConfig,
TLSHandshakeTimeout: 10 * time.Second,
MaxIdleConnsPerHost: DefaultConnections,
},
}
for _, opt := range opts {
opt(a)
}
return a
}
// Workers returns a functional option which sets the initial number of workers
// an Attacker uses to hit its targets. More workers may be spawned dynamically
// to sustain the requested rate in the face of slow responses and errors.
func Workers(n uint64) func(*Attacker) {
return func(a *Attacker) { a.workers = n }
}
// Connections returns a functional option which sets the number of maximum idle
// open connections per target host.
func Connections(n int) func(*Attacker) {
return func(a *Attacker) {
tr := a.client.Transport.(*http.Transport)
tr.MaxIdleConnsPerHost = n
}
}
// Redirects returns a functional option which sets the maximum
// number of redirects an Attacker will follow.
func Redirects(n int) func(*Attacker) {
return func(a *Attacker) {
a.redirects = n
a.client.CheckRedirect = func(_ *http.Request, via []*http.Request) error {
if len(via) > n {
return fmt.Errorf("stopped after %d redirects", n)
}
return nil
}
}
}
// Timeout returns a functional option which sets the maximum amount of time
// an Attacker will wait for a request to be responded to.
func Timeout(d time.Duration) func(*Attacker) {
return func(a *Attacker) {
tr := a.client.Transport.(*http.Transport)
tr.ResponseHeaderTimeout = d
a.dialer.Timeout = d
tr.Dial = a.dialer.Dial
}
}
// LocalAddr returns a functional option which sets the local address
// an Attacker will use with its requests.
func LocalAddr(addr net.IPAddr) func(*Attacker) {
return func(a *Attacker) {
tr := a.client.Transport.(*http.Transport)
a.dialer.LocalAddr = &net.TCPAddr{IP: addr.IP, Zone: addr.Zone}
tr.Dial = a.dialer.Dial
}
}
// KeepAlive returns a functional option which toggles KeepAlive
// connections on the dialer and transport.
func KeepAlive(keepalive bool) func(*Attacker) {
return func(a *Attacker) {
tr := a.client.Transport.(*http.Transport)
tr.DisableKeepAlives = !keepalive
if !keepalive {
a.dialer.KeepAlive = 0
tr.Dial = a.dialer.Dial
}
}
}
// TLSConfig returns a functional option which sets the *tls.Config for a
// Attacker to use with its requests.
func TLSConfig(c *tls.Config) func(*Attacker) {
return func(a *Attacker) {
tr := a.client.Transport.(*http.Transport)
tr.TLSClientConfig = c
}
}
// Attack reads its Targets from the passed Targeter and attacks them at
// the rate specified for duration time. When the duration is zero the attack
// runs until Stop is called. Results are put into the returned channel as soon
// as they arrive.
func (a *Attacker) Attack(tr Targeter, rate uint64, du time.Duration) <-chan *Result {
var workers sync.WaitGroup
results := make(chan *Result)
ticks := make(chan time.Time)
for i := uint64(0); i < a.workers; i++ {
go a.attack(tr, &workers, ticks, results)
}
go func() {
defer close(results)
defer workers.Wait()
defer close(ticks)
interval := 1e9 / rate
hits := rate * uint64(du.Seconds())
began, done := time.Now(), uint64(0)
for {
now, next := time.Now(), began.Add(time.Duration(done*interval))
time.Sleep(next.Sub(now))
select {
case ticks <- max(next, now):
if done++; done == hits {
return
}
case <-a.stopch:
return
default: // all workers are blocked. start one more and try again
go a.attack(tr, &workers, ticks, results)
}
}
}()
return results
}
// Stop stops the current attack.
func (a *Attacker) Stop() {
select {
case <-a.stopch:
return
default:
close(a.stopch)
}
}
func (a *Attacker) attack(tr Targeter, workers *sync.WaitGroup, ticks <-chan time.Time, results chan<- *Result) {
workers.Add(1)
defer workers.Done()
for tm := range ticks {
results <- a.hit(tr, tm)
}
}
func (a *Attacker) hit(tr Targeter, tm time.Time) *Result {
var (
res = Result{Timestamp: tm}
tgt Target
err error
)
defer func() {
res.Latency = time.Since(tm)
if err != nil {
res.Error = err.Error()
}
}()
if err = tr(&tgt); err != nil {
a.Stop()
return &res
}
req, err := tgt.Request()
if err != nil {
return &res
}
r, err := a.client.Do(req)
if err != nil {
// ignore redirect errors when the user set --redirects=NoFollow
if a.redirects == NoFollow && strings.Contains(err.Error(), "stopped after") {
err = nil
}
return &res
}
defer r.Body.Close()
in, err := io.Copy(ioutil.Discard, r.Body)
if err != nil {
return &res
}
res.BytesIn = uint64(in)
if req.ContentLength != -1 {
res.BytesOut = uint64(req.ContentLength)
}
if res.Code = uint16(r.StatusCode); res.Code < 200 || res.Code >= 400 {
res.Error = r.Status
}
return &res
}
func max(a, b time.Time) time.Time {
if a.After(b) {
return a
}
return b
}