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wakapi/middlewares/logging.go

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package middlewares
// Borrowed from https://gist.github.com/elithrar/887d162dfd0c539b700ab4049c76e22b
import (
"io"
"net/http"
"strings"
"time"
)
type logFunc func(string, ...interface{})
type LoggingMiddleware struct {
handler http.Handler
logFunc logFunc
excludePrefixes []string
}
func NewLoggingMiddleware(logFunc logFunc, excludePrefixes []string) func(http.Handler) http.Handler {
return func(h http.Handler) http.Handler {
return &LoggingMiddleware{
handler: h,
logFunc: logFunc,
excludePrefixes: excludePrefixes,
}
}
}
func (lg *LoggingMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ww := wrapWriter(w)
start := time.Now()
lg.handler.ServeHTTP(ww, r)
end := time.Now()
duration := end.Sub(start)
path := strings.ToLower(r.URL.Path)
for _, prefix := range lg.excludePrefixes {
if strings.HasPrefix(path, prefix) {
return
}
}
lg.logFunc(
"[request] status=%d, method=%s, uri=%s, duration=%v, bytes=%d, addr=%s, user=%s",
ww.Status(),
r.Method,
r.URL.String(),
duration,
ww.BytesWritten(),
readUserIP(r),
readUserID(r),
)
}
func readUserIP(r *http.Request) string {
ip := r.Header.Get("X-Real-Ip")
if ip == "" {
ip = r.Header.Get("X-Forwarded-For")
}
if ip == "" {
ip = r.RemoteAddr
}
return ip
}
func readUserID(r *http.Request) string {
if user := GetPrincipal(r); user != nil {
return user.ID
}
return "-"
}
// The below writer-wrapping code has been lifted from
// https://github.com/zenazn/goji/blob/master/web/middleware/logger.go - because
// it does exactly what is needed, and it's unlikely to change in any
// significant way that makes copying worse-off than importing. MIT licensed
// and (c) Carl Jackson.
// writerProxy is a proxy around an http.ResponseWriter that allows you to hook
// into various parts of the response process.
type writerProxy interface {
http.ResponseWriter
// Status returns the HTTP status of the request, or 0 if one has not
// yet been sent.
Status() int
// BytesWritten returns the total number of bytes sent to the client.
BytesWritten() int
// Tee causes the response body to be written to the given io.Writer in
// addition to proxying the writes through. Only one io.Writer can be
// tee'd to at once: setting a second one will overwrite the first.
// Writes will be sent to the proxy before being written to this
// io.Writer. It is illegal for the tee'd writer to be modified
// concurrently with writes.
Tee(io.Writer)
// Unwrap returns the original proxied target.
Unwrap() http.ResponseWriter
}
// wrapWriter wraps an http.ResponseWriter, returning a proxy that allows you to
// hook into various parts of the response process.
func wrapWriter(w http.ResponseWriter) writerProxy {
return &basicWriter{ResponseWriter: w}
}
// basicWriter wraps a http.ResponseWriter that implements the minimal
// http.ResponseWriter interface.
type basicWriter struct {
http.ResponseWriter
wroteHeader bool
code int
bytes int
tee io.Writer
}
func (b *basicWriter) WriteHeader(code int) {
if !b.wroteHeader {
b.code = code
b.wroteHeader = true
b.ResponseWriter.WriteHeader(code)
}
}
func (b *basicWriter) Write(buf []byte) (int, error) {
b.WriteHeader(http.StatusOK)
n, err := b.ResponseWriter.Write(buf)
if b.tee != nil {
_, err2 := b.tee.Write(buf[:n])
// Prefer errors generated by the proxied writer.
if err == nil {
err = err2
}
}
b.bytes += n
return n, err
}
func (b *basicWriter) maybeWriteHeader() {
if !b.wroteHeader {
b.WriteHeader(http.StatusOK)
}
}
func (b *basicWriter) Status() int {
return b.code
}
func (b *basicWriter) BytesWritten() int {
return b.bytes
}
func (b *basicWriter) Tee(w io.Writer) {
b.tee = w
}
func (b *basicWriter) Unwrap() http.ResponseWriter {
return b.ResponseWriter
}