forked from tsenart/vegeta
/
targets.go
371 lines (327 loc) · 8.84 KB
/
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"
jlexer "github.com/mailru/easyjson/jlexer"
jwriter "github.com/mailru/easyjson/jwriter"
)
// Target is an HTTP request blueprint.
//
//go:generate go run ../internal/cmd/jsonschema/main.go -type=Target -output=target.schema.json
type Target struct {
Method string `json:"method"`
URL string `json:"url"`
Body []byte `json:"body,omitempty"`
Header http.Header `json:"header,omitempty"`
}
// 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
}
// Equal returns true if the target is equal to the other given target.
func (t *Target) Equal(other *Target) bool {
switch {
case t == other:
return true
case t == nil || other == nil:
return false
default:
equal := t.Method == other.Method &&
t.URL == other.URL &&
bytes.Equal(t.Body, other.Body) &&
len(t.Header) == len(other.Header)
if !equal {
return false
}
for k := range t.Header {
left, right := t.Header[k], other.Header[k]
if len(left) != len(right) {
return false
}
for i := range left {
if left[i] != right[i] {
return false
}
}
}
return true
}
}
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")
// ErrNoMethod is returned by JSONTargeter when a parsed Target has
// no method.
ErrNoMethod = errors.New("target: required method is missing")
// ErrNoURL is returned by JSONTargeter when a parsed Target has no
// URL.
ErrNoURL = errors.New("target: required url is missing")
// TargetFormats contains the canonical list of the valid target
// format identifiers.
TargetFormats = []string{HTTPTargetFormat, JSONTargetFormat}
)
const (
// HTTPTargetFormat is the human readable identifier for the HTTP target format.
HTTPTargetFormat = "http"
// JSONTargetFormat is the human readable identifier for the JSON target format.
JSONTargetFormat = "json"
)
// 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
// Decode is a convenience method that calls the underlying Targeter function.
func (tr Targeter) Decode(t *Target) error {
return tr(t)
}
// NewJSONTargeter returns a new targeter that decodes one Target from the
// given io.Reader on every invocation. Each target is one JSON object in its own line.
//
// The method and url fields are required. If present, the body field must be base64 encoded.
// The generated [JSON Schema](lib/target.schema.json) defines the format in detail.
//
// {"method":"POST", "url":"https://goku/1", "header":{"Content-Type":["text/plain"], "body": "Rk9P"}
// {"method":"GET", "url":"https://goku/2"}
//
// body will be set as the Target's body if no body is provided in each target definiton.
// hdr will be merged with the each Target's headers.
//
func NewJSONTargeter(src io.Reader, body []byte, header http.Header) Targeter {
type reader struct {
*bufio.Reader
sync.Mutex
}
rd := reader{Reader: bufio.NewReader(src)}
return func(tgt *Target) (err error) {
if tgt == nil {
return ErrNilTarget
}
var jl jlexer.Lexer
rd.Lock()
for len(jl.Data) == 0 {
if jl.Data, err = rd.ReadBytes('\n'); err != nil {
break
}
jl.Data = bytes.TrimSpace(jl.Data) // Skip empty lines
}
rd.Unlock()
if err != nil {
if err == io.EOF {
err = ErrNoTargets
}
return err
}
var t jsonTarget
t.decode(&jl)
if err = jl.Error(); err != nil {
return err
} else if t.Method == "" {
return ErrNoMethod
} else if t.URL == "" {
return ErrNoURL
}
tgt.Method = t.Method
tgt.URL = t.URL
if tgt.Body = body; len(t.Body) > 0 {
tgt.Body = t.Body
}
if tgt.Header == nil {
tgt.Header = http.Header{}
}
for k, vs := range header {
tgt.Header[k] = append(tgt.Header[k], vs...)
}
for k, vs := range t.Header {
tgt.Header[k] = append(tgt.Header[k], vs...)
}
return nil
}
}
// A TargetEncoder encodes a Target in a format that can be read by a Targeter.
type TargetEncoder func(*Target) error
// Encode is a convenience method that calls the underlying TargetEncoder function.
func (enc TargetEncoder) Encode(t *Target) error {
return enc(t)
}
// NewJSONTargetEncoder returns a TargetEncoder that encods Targets in the JSON format.
func NewJSONTargetEncoder(w io.Writer) TargetEncoder {
var jw jwriter.Writer
return func(t *Target) error {
(*jsonTarget)(t).encode(&jw)
if jw.Error != nil {
return jw.Error
}
jw.RawByte('\n')
_, err := jw.DumpTo(w)
return err
}
}
// 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
}
}
// ReadAllTargets eagerly reads all Targets out of the provided Targeter.
func ReadAllTargets(t Targeter) (tgts []Target, err error) {
for {
var tgt Target
if err = t(&tgt); err == ErrNoTargets {
break
} else if err != nil {
return nil, err
}
tgts = append(tgts, tgt)
}
if len(tgts) == 0 {
return nil, ErrNoTargets
}
return tgts, nil
}
// NewHTTPTargeter returns a new Targeter that decodes one Target from the
// given io.Reader on every invocation. The format is as follows:
//
// GET https://foo.bar/a/b/c
// Header-X: 123
// Header-Y: 321
// @/path/to/body/file
//
// POST https://foo.bar/b/c/a
// Header-X: 123
//
// 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 NewHTTPTargeter(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 && 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
}