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enriched-response.go
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enriched-response.go
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package api
import (
"bufio"
"errors"
"net"
"net/http"
"github.com/safing/portbase/log"
)
// LoggingResponseWriter is a wrapper for http.ResponseWriter for better request logging.
type LoggingResponseWriter struct {
ResponseWriter http.ResponseWriter
Request *http.Request
Status int
}
// NewLoggingResponseWriter wraps a http.ResponseWriter.
func NewLoggingResponseWriter(w http.ResponseWriter, r *http.Request) *LoggingResponseWriter {
return &LoggingResponseWriter{
ResponseWriter: w,
Request: r,
}
}
// Header wraps the original Header method.
func (lrw *LoggingResponseWriter) Header() http.Header {
return lrw.ResponseWriter.Header()
}
// Write wraps the original Write method.
func (lrw *LoggingResponseWriter) Write(b []byte) (int, error) {
return lrw.ResponseWriter.Write(b)
}
// WriteHeader wraps the original WriteHeader method to extract information.
func (lrw *LoggingResponseWriter) WriteHeader(code int) {
lrw.Status = code
lrw.ResponseWriter.WriteHeader(code)
}
// Hijack wraps the original Hijack method, if available.
func (lrw *LoggingResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
hijacker, ok := lrw.ResponseWriter.(http.Hijacker)
if ok {
c, b, err := hijacker.Hijack()
if err != nil {
return nil, nil, err
}
log.Tracer(lrw.Request.Context()).Infof("api request: %s HIJ %s", lrw.Request.RemoteAddr, lrw.Request.RequestURI)
return c, b, nil
}
return nil, nil, errors.New("response does not implement http.Hijacker")
}
// RequestLogger is a logging middleware.
func RequestLogger(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log.Tracer(r.Context()).Tracef("api request: %s ___ %s", r.RemoteAddr, r.RequestURI)
lrw := NewLoggingResponseWriter(w, r)
next.ServeHTTP(lrw, r)
if lrw.Status != 0 {
// request may have been hijacked
log.Tracer(r.Context()).Infof("api request: %s %d %s", lrw.Request.RemoteAddr, lrw.Status, lrw.Request.RequestURI)
}
})
}