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targets.go
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targets.go
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package vegeta
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"regexp"
"strings"
"sync"
"sync/atomic"
)
// Target is an HTTP request blueprint.
type Target struct {
Method string
URL string
Body []byte
Header http.Header
}
// Request creates an *http.Request out of Target and returns it along with an
// error in case of failure.
func (t *Target) Request() (*http.Request, error) {
req, err := http.NewRequest(t.Method, t.URL, bytes.NewReader(t.Body))
if err != nil {
return nil, err
}
for k, vs := range t.Header {
req.Header[k] = make([]string, len(vs))
copy(req.Header[k], vs)
}
if host := req.Header.Get("Host"); host != "" {
req.Host = host
}
return req, nil
}
var (
// ErrNoTargets is returned when not enough Targets are available.
ErrNoTargets = errors.New("no targets to attack")
// ErrNilTarget is returned when the passed Target pointer is nil.
ErrNilTarget = errors.New("nil target")
)
// A Targeter decodes a Target or returns an error in case of failure.
// Implementations must be safe for concurrent use.
type Targeter func(*Target) error
// NewStaticTargeter returns a Targeter which round-robins over the passed
// Targets.
func NewStaticTargeter(tgts ...Target) Targeter {
i := int64(-1)
return func(tgt *Target) error {
if tgt == nil {
return ErrNilTarget
}
*tgt = tgts[atomic.AddInt64(&i, 1)%int64(len(tgts))]
return nil
}
}
// NewEagerTargeter eagerly reads all Targets out of the provided io.Reader and
// returns a NewStaticTargeter with them.
//
// body will be set as the Target's body if no body is provided.
// hdr will be merged with the each Target's headers.
func NewEagerTargeter(src io.Reader, body []byte, header http.Header) (Targeter, error) {
var (
sc = NewLazyTargeter(src, body, header)
tgts []Target
tgt Target
err error
)
for {
if err = sc(&tgt); err == ErrNoTargets {
break
} else if err != nil {
return nil, err
}
tgts = append(tgts, tgt)
}
if len(tgts) == 0 {
return nil, ErrNoTargets
}
return NewStaticTargeter(tgts...), nil
}
// NewLazyTargeter returns a new Targeter that lazily scans Targets from the
// provided io.Reader on every invocation.
//
// body will be set as the Target's body if no body is provided.
// hdr will be merged with the each Target's headers.
func NewLazyTargeter(src io.Reader, body []byte, hdr http.Header) Targeter {
var mu sync.Mutex
sc := peekingScanner{src: bufio.NewScanner(src)}
return func(tgt *Target) (err error) {
mu.Lock()
defer mu.Unlock()
if tgt == nil {
return ErrNilTarget
}
var line string
for {
if !sc.Scan() {
return ErrNoTargets
}
line = strings.TrimSpace(sc.Text())
if len(line) != 0 {
break
}
}
tgt.Body = body
tgt.Header = http.Header{}
for k, vs := range hdr {
tgt.Header[k] = vs
}
tokens := strings.SplitN(line, " ", 2)
if len(tokens) < 2 {
return fmt.Errorf("bad target: %s", line)
}
if !startsWithHTTPMethod(line) {
return fmt.Errorf("bad method: %s", tokens[0])
}
tgt.Method = tokens[0]
if _, err = url.ParseRequestURI(tokens[1]); err != nil {
return fmt.Errorf("bad URL: %s", tokens[1])
}
tgt.URL = tokens[1]
line = strings.TrimSpace(sc.Peek())
if line == "" || startsWithHTTPMethod(line) {
return nil
}
for sc.Scan() {
if line = strings.TrimSpace(sc.Text()); line == "" {
break
} else if strings.HasPrefix(line, "@") {
if tgt.Body, err = ioutil.ReadFile(line[1:]); err != nil {
return fmt.Errorf("bad body: %s", err)
}
break
}
tokens = strings.SplitN(line, ":", 2)
if len(tokens) < 2 {
return fmt.Errorf("bad header: %s", line)
}
for i := range tokens {
if tokens[i] = strings.TrimSpace(tokens[i]); tokens[i] == "" {
return fmt.Errorf("bad header: %s", line)
}
}
// Add key/value directly to the http.Header (map[string][]string).
// http.Header.Add() canonicalizes keys but vegeta is used
// to test systems that require case-sensitive headers.
tgt.Header[tokens[0]] = append(tgt.Header[tokens[0]], tokens[1])
}
if err = sc.Err(); err != nil {
return ErrNoTargets
}
return nil
}
}
var httpMethodChecker = regexp.MustCompile("^[A-Z]+\\s")
// A line starts with an http method when the first word is uppercase ascii
// followed by a space.
func startsWithHTTPMethod(t string) bool {
return httpMethodChecker.MatchString(t)
}
// Wrap a Scanner so we can cheat and look at the next value and react accordingly,
// but still have it be around the next time we Scan() + Text()
type peekingScanner struct {
src *bufio.Scanner
peeked string
}
func (s *peekingScanner) Err() error {
return s.src.Err()
}
func (s *peekingScanner) Peek() string {
if !s.src.Scan() {
return ""
}
s.peeked = s.src.Text()
return s.peeked
}
func (s *peekingScanner) Scan() bool {
if s.peeked == "" {
return s.src.Scan()
}
return true
}
func (s *peekingScanner) Text() string {
if s.peeked == "" {
return s.src.Text()
}
t := s.peeked
s.peeked = ""
return t
}