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log_middleware.go
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log_middleware.go
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package logging
import (
"fmt"
"net/http"
"runtime"
"strings"
"time"
)
type LogMiddleware struct {
Next http.Handler
}
func NewLogMiddleware(next http.Handler) *LogMiddleware {
return &LogMiddleware{
Next: next,
}
}
func (mw *LogMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
EnsureCorrelationId(r)
start := time.Now()
defer func() {
if rec := recover(); rec != nil {
AccessError(r, start, fmt.Errorf("PANIC (%v): %v", identifyLogOrigin(), rec))
}
}()
lrw := &logResponseWriter{ResponseWriter: w}
mw.Next.ServeHTTP(lrw, r)
Access(r, start, lrw.statusCode)
}
// identifyLogOrigin returns the location, where a panic was raised
// in the form package/subpackage.method:line
func identifyLogOrigin() string {
var name, file string
var line int
var pc [16]uintptr
n := runtime.Callers(3, pc[:])
for _, pc := range pc[:n] {
fn := runtime.FuncForPC(pc)
if fn == nil {
continue
}
file, line = fn.FileLine(pc)
name = fn.Name()
if !strings.HasPrefix(name, "runtime.") {
break
}
}
switch {
case name != "":
return fmt.Sprintf("%v:%v", name, line)
case file != "":
return fmt.Sprintf("%v:%v", file, line)
}
return fmt.Sprintf("pc:%x", pc)
}
type logResponseWriter struct {
http.ResponseWriter
statusCode int
}
func (lrw *logResponseWriter) Write(b []byte) (int, error) {
if lrw.statusCode == 0 {
lrw.statusCode = 200
}
return lrw.ResponseWriter.Write(b)
}
func (lrw *logResponseWriter) WriteHeader(statusCode int) {
lrw.statusCode = statusCode
lrw.ResponseWriter.WriteHeader(statusCode)
}