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blixt/logger_middleware.go

Last active July 5, 2024 22:02
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Revisions

  1. blixt revised this gist Oct 29, 2016. 1 changed file with 4 additions and 0 deletions.
    4 changes: 4 additions & 0 deletions logger_middleware.go
    View file
    Original file line number Diff line number Diff line change
    @@ -14,6 +14,10 @@ import (
    // 127.0.0.1 - - [28/Oct/2016:18:35:05 -0400] "GET /favicon.ico HTTP/1.1" 404 10 "http://localhost:8080/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36"
    func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    if r.URL.Path != "/" {
    http.Error(w, "Not Found", http.StatusNotFound)
    return
    }
    fmt.Fprintln(w, "Hello World!")
    })
    log.Println("Serving...")
  2. blixt revised this gist Oct 29, 2016. 1 changed file with 2 additions and 1 deletion.
    3 changes: 2 additions & 1 deletion logger_middleware.go
    View file
    Original file line number Diff line number Diff line change
    @@ -11,12 +11,13 @@ import (

    // Example log output:
    // 127.0.0.1 - - [28/Oct/2016:18:35:05 -0400] "GET / HTTP/1.1" 200 13 "" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36"
    // 127.0.0.1 - - [28/Oct/2016:18:35:05 -0400] "GET /favicon.ico HTTP/1.1" 404 23 "http://localhost:8080/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36"
    // 127.0.0.1 - - [28/Oct/2016:18:35:05 -0400] "GET /favicon.ico HTTP/1.1" 404 10 "http://localhost:8080/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36"
    func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Hello World!")
    })
    log.Println("Serving...")
    // Logger takes an io.Writer and an http.Handler function to wrap:
    http.ListenAndServe(":8080", Logger(os.Stderr, http.DefaultServeMux))
    }

  3. blixt created this gist Oct 29, 2016.
    67 changes: 67 additions & 0 deletions logger_middleware.go
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,67 @@
    package main

    import (
    "fmt"
    "io"
    "log"
    "net/http"
    "os"
    "time"
    )

    // Example log output:
    // 127.0.0.1 - - [28/Oct/2016:18:35:05 -0400] "GET / HTTP/1.1" 200 13 "" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36"
    // 127.0.0.1 - - [28/Oct/2016:18:35:05 -0400] "GET /favicon.ico HTTP/1.1" 404 23 "http://localhost:8080/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36"
    func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Hello World!")
    })
    log.Println("Serving...")
    http.ListenAndServe(":8080", Logger(os.Stderr, http.DefaultServeMux))
    }

    // Logs incoming requests, including response status.
    func Logger(out io.Writer, h http.Handler) http.Handler {
    logger := log.New(out, "", 0)
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    o := &responseObserver{ResponseWriter: w}
    h.ServeHTTP(o, r)
    addr := r.RemoteAddr
    if i := strings.LastIndex(addr, ":"); i != -1 {
    addr = addr[:i]
    }
    logger.Printf("%s - - [%s] %q %d %d %q %q",
    addr,
    time.Now().Format("02/Jan/2006:15:04:05 -0700"),
    fmt.Sprintf("%s %s %s", r.Method, r.URL, r.Proto),
    o.status,
    o.written,
    r.Referer(),
    r.UserAgent())
    })
    }

    type responseObserver struct {
    http.ResponseWriter
    status int
    written int64
    wroteHeader bool
    }

    func (o *responseObserver) Write(p []byte) (n int, err error) {
    if !o.wroteHeader {
    o.WriteHeader(http.StatusOK)
    }
    n, err = o.ResponseWriter.Write(p)
    o.written += int64(n)
    return
    }

    func (o *responseObserver) WriteHeader(code int) {
    o.ResponseWriter.WriteHeader(code)
    if o.wroteHeader {
    return
    }
    o.wroteHeader = true
    o.status = code
    }