mirror of
https://github.com/muety/wakapi.git
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125 lines
3.2 KiB
Go
125 lines
3.2 KiB
Go
package middlewares
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// Borrowed from https://gist.github.com/elithrar/887d162dfd0c539b700ab4049c76e22b
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import (
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"io"
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"log"
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"net/http"
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"time"
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)
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type LoggingMiddleware struct {
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handler http.Handler
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output *log.Logger
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}
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func NewLoggingMiddleware(output *log.Logger) func(http.Handler) http.Handler {
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return func(h http.Handler) http.Handler {
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return &LoggingMiddleware{
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handler: h,
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output: output,
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}
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}
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}
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func (lg *LoggingMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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ww := wrapWriter(w)
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start := time.Now()
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lg.handler.ServeHTTP(ww, r)
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end := time.Now()
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duration := end.Sub(start)
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lg.output.Printf(
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"%v status=%d, method=%s, uri=%s, duration=%v, bytes=%d, addr=%s\n",
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time.Now().Format(time.RFC3339Nano),
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ww.Status(),
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r.Method,
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r.URL.String(),
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duration,
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ww.BytesWritten(),
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r.RemoteAddr,
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)
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}
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// The below writer-wrapping code has been lifted from
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// https://github.com/zenazn/goji/blob/master/web/middleware/logger.go - because
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// it does exactly what is needed, and it's unlikely to change in any
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// significant way that makes copying worse-off than importing. MIT licensed
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// and (c) Carl Jackson.
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// writerProxy is a proxy around an http.ResponseWriter that allows you to hook
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// into various parts of the response process.
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type writerProxy interface {
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http.ResponseWriter
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// Status returns the HTTP status of the request, or 0 if one has not
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// yet been sent.
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Status() int
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// BytesWritten returns the total number of bytes sent to the client.
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BytesWritten() int
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// Tee causes the response body to be written to the given io.Writer in
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// addition to proxying the writes through. Only one io.Writer can be
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// tee'd to at once: setting a second one will overwrite the first.
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// Writes will be sent to the proxy before being written to this
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// io.Writer. It is illegal for the tee'd writer to be modified
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// concurrently with writes.
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Tee(io.Writer)
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// Unwrap returns the original proxied target.
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Unwrap() http.ResponseWriter
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}
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// wrapWriter wraps an http.ResponseWriter, returning a proxy that allows you to
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// hook into various parts of the response process.
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func wrapWriter(w http.ResponseWriter) writerProxy {
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return &basicWriter{ResponseWriter: w}
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}
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// basicWriter wraps a http.ResponseWriter that implements the minimal
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// http.ResponseWriter interface.
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type basicWriter struct {
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http.ResponseWriter
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wroteHeader bool
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code int
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bytes int
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tee io.Writer
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}
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func (b *basicWriter) WriteHeader(code int) {
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if !b.wroteHeader {
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b.code = code
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b.wroteHeader = true
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b.ResponseWriter.WriteHeader(code)
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}
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}
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func (b *basicWriter) Write(buf []byte) (int, error) {
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b.WriteHeader(http.StatusOK)
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n, err := b.ResponseWriter.Write(buf)
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if b.tee != nil {
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_, err2 := b.tee.Write(buf[:n])
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// Prefer errors generated by the proxied writer.
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if err == nil {
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err = err2
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}
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}
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b.bytes += n
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return n, err
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}
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func (b *basicWriter) maybeWriteHeader() {
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if !b.wroteHeader {
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b.WriteHeader(http.StatusOK)
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}
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}
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func (b *basicWriter) Status() int {
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return b.code
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}
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func (b *basicWriter) BytesWritten() int {
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return b.bytes
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}
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func (b *basicWriter) Tee(w io.Writer) {
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b.tee = w
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}
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func (b *basicWriter) Unwrap() http.ResponseWriter {
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return b.ResponseWriter
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}
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