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output_http.go
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/
output_http.go
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package main
import (
"bufio"
"bytes"
es "github.com/buger/gor/elasticsearch"
"io"
"log"
"net/http"
"net/url"
"strconv"
"strings"
"time"
)
type RedirectNotAllowed struct{}
func (e *RedirectNotAllowed) Error() string {
return "Redirects not allowed"
}
// customCheckRedirect disables redirects https://github.com/buger/gor/pull/15
func customCheckRedirect(req *http.Request, via []*http.Request) error {
if len(via) >= 0 {
return new(RedirectNotAllowed)
}
return nil
}
// ParseRequest in []byte returns a http request or an error
func ParseRequest(data []byte) (request *http.Request, err error) {
buf := bytes.NewBuffer(data)
reader := bufio.NewReader(buf)
request, err = http.ReadRequest(reader)
return
}
type HTTPOutput struct {
address string
limit int
buf chan []byte
headers HTTPHeaders
methods HTTPMethods
elasticSearch *es.ESPlugin
bufStats *GorStat
}
func NewHTTPOutput(options string, headers HTTPHeaders, methods HTTPMethods, elasticSearchAddr string) io.Writer {
o := new(HTTPOutput)
optionsArr := strings.Split(options, "|")
address := optionsArr[0]
if !strings.HasPrefix(address, "http") {
address = "http://" + address
}
o.address = address
o.headers = headers
o.methods = methods
o.buf = make(chan []byte, 100)
o.bufStats = NewGorStat("output_http")
if elasticSearchAddr != "" {
o.elasticSearch = new(es.ESPlugin)
o.elasticSearch.Init(elasticSearchAddr)
}
if len(optionsArr) > 1 {
o.limit, _ = strconv.Atoi(optionsArr[1])
}
for i := 0; i < 10; i++ {
go o.worker(i)
}
if o.limit > 0 {
return NewLimiter(o, o.limit)
} else {
return o
}
}
func (o *HTTPOutput) worker(n int) {
client := &http.Client{
CheckRedirect: customCheckRedirect,
}
for {
data := <-o.buf
o.sendRequest(client, data)
}
}
func (o *HTTPOutput) Write(data []byte) (n int, err error) {
buf := make([]byte, len(data))
copy(buf, data)
o.buf <- buf
o.bufStats.Write(len(o.buf))
return len(data), nil
}
func (o *HTTPOutput) sendRequest(client *http.Client, data []byte) {
request, err := ParseRequest(data)
if err != nil {
log.Println("Cannot parse request", string(data), err)
return
}
if len(o.methods) > 0 && !o.methods.Contains(request.Method) {
return
}
// Change HOST of original request
URL := o.address + request.URL.Path + "?" + request.URL.RawQuery
request.RequestURI = ""
request.URL, _ = url.ParseRequestURI(URL)
for _, header := range o.headers {
request.Header.Set(header.Name, header.Value)
}
start := time.Now()
resp, err := client.Do(request)
stop := time.Now()
// We should not count Redirect as errors
if urlErr, ok := err.(*url.Error); ok {
if _, ok := urlErr.Err.(*RedirectNotAllowed); ok {
err = nil
}
}
if err == nil {
defer resp.Body.Close()
} else {
log.Println("Request error:", err)
}
if o.elasticSearch != nil {
o.elasticSearch.ResponseAnalyze(request, resp, start, stop)
}
}
func (o *HTTPOutput) String() string {
return "HTTP output: " + o.address
}