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package main
import (
"fmt"
"io"
"net/http"
)
type loggingResponseWriter struct {
http.ResponseWriter
statusCode int
}
func (lrw *loggingResponseWriter) WriteHeader(code int) {
lrw.statusCode = code
// avoids warning: superfluous response.WriteHeader call
if lrw.statusCode != http.StatusOK {
lrw.ResponseWriter.WriteHeader(code)
}
}
func NewLoggingResponseWriter(w http.ResponseWriter) *loggingResponseWriter {
return &loggingResponseWriter{w, http.StatusOK}
}
type wrappedHandlerOptions struct {
defaultHostname string
logger io.Writer
}
func wrapHandlerWithLogging(wrappedHandler http.Handler, opts wrappedHandlerOptions) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
scheme := r.Header.Get("X-Forwarded-Proto")
if scheme == "" {
scheme = "http"
}
host := r.Header.Get("Host")
if host == "" {
host = opts.defaultHostname
}
lw := NewLoggingResponseWriter(w)
wrappedHandler.ServeHTTP(lw, r)
statusCode := lw.statusCode
fmt.Fprintf(
opts.logger,
"%s %s %d %s %s %s\n",
scheme,
r.Method,
statusCode,
host,
r.URL.Path,
lw.Header().Get("Location"),
)
})
}
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