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logger.go
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logger.go
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package middleware
import (
"bytes"
"io"
"net/http"
"time"
"github.com/ralch/slogr"
)
// WithLogger set up the http logger.
func WithLogger() func(http.Handler) http.Handler {
innerFn := func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
start := time.Now()
writer := &ResponseWriter{
ResponseWriter: w,
ResponseBody: &bytes.Buffer{},
}
defer writer.Flush()
// prepare the logger
logger := slogr.FromContext(ctx)
logger = logger.With(slogr.Request(r))
// prepare the context
ctx = slogr.WithContext(ctx, logger)
// prepare the request
r = r.WithContext(ctx)
// execute the handler
next.ServeHTTP(writer, r)
duration := time.Since(start)
// log the request end
logger = logger.With(slogr.ResponseWriter(writer, slogr.WithLatency(duration)))
status := writer.GetStatusCode()
switch {
case status < 400:
logger.InfoContext(ctx, "")
case status < 500:
logger.WarnContext(ctx, "")
default:
logger.ErrorContext(ctx, "")
}
}
return http.HandlerFunc(fn)
}
return innerFn
}
var (
_ http.Flusher = &ResponseWriter{}
_ http.ResponseWriter = &ResponseWriter{}
)
// ResponseWriter repersents a response writer.
type ResponseWriter struct {
ResponseWriter http.ResponseWriter
ResponseBody io.ReadWriter
StatusCode int32
ContentLength int64
}
// Flush implements http.Flusher.
func (r *ResponseWriter) Flush() {
io.Copy(r.ResponseWriter, r.ResponseBody)
if flusher, ok := r.ResponseWriter.(http.Flusher); ok {
flusher.Flush()
}
}
// Header implements http.ResponseWriter
func (r *ResponseWriter) Header() http.Header {
return r.ResponseWriter.Header()
}
// Write implements http.ResponseWriter
func (r *ResponseWriter) Write(data []byte) (int, error) {
n, err := r.ResponseBody.Write(data)
r.ContentLength = r.ContentLength + int64(n)
return n, err
}
// WriteHeader implements http.ResponseWriter
func (r *ResponseWriter) WriteHeader(code int) {
r.StatusCode = int32(code)
r.ResponseWriter.WriteHeader(code)
}
// GetStatusCode returns the StatusCode.
func (r *ResponseWriter) GetStatusCode() int32 {
return r.StatusCode
}
// GetContentLength returns the ContentLength.
func (r *ResponseWriter) GetContentLength() int64 {
return r.ContentLength
}