/
countingresponsewriter.go
62 lines (54 loc) · 1.48 KB
/
countingresponsewriter.go
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package requestlog
import (
"bufio"
"bytes"
"fmt"
"net"
"net/http"
"strings"
)
type CountingResponseWriter struct {
StatusCode int
ResponseLength int
Hijacked bool
ResponseWriter http.ResponseWriter
ResponseBody *bytes.Buffer
RequestBody *bytes.Buffer
}
func (crw *CountingResponseWriter) Header() http.Header {
return crw.ResponseWriter.Header()
}
func (crw *CountingResponseWriter) Write(data []byte) (int, error) {
if crw.ResponseLength == -1 {
crw.ResponseLength = 0
}
if crw.StatusCode == -1 {
crw.StatusCode = http.StatusOK
}
crw.ResponseLength += len(data)
if crw.ResponseBody != nil && crw.ResponseBody.Len() < MaxRequestSizeLog {
crw.ResponseBody.Write(CutRequestData(data, crw.ResponseBody.Len()))
}
return crw.ResponseWriter.Write(data)
}
func (crw *CountingResponseWriter) WriteHeader(statusCode int) {
crw.StatusCode = statusCode
crw.ResponseWriter.WriteHeader(statusCode)
if !strings.HasPrefix(crw.Header().Get("Content-Type"), "application/json") {
crw.ResponseBody = nil
}
}
func (crw *CountingResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
hijacker, ok := crw.ResponseWriter.(http.Hijacker)
if !ok {
return nil, nil, fmt.Errorf("CountingResponseWriter: %T does not implement http.Hijacker", crw.ResponseWriter)
}
crw.Hijacked = true
return hijacker.Hijack()
}
func CutRequestData(data []byte, length int) []byte {
if len(data)+length > MaxRequestSizeLog {
return data[:MaxRequestSizeLog-length]
}
return data
}