forked from sassoftware/relic
/
logging.go
90 lines (81 loc) · 2.36 KB
/
logging.go
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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package server
import (
"fmt"
"net/http"
"strings"
"time"
)
// Log a general message
func (s *Server) Logf(format string, args ...interface{}) {
s.ErrorLog.Output(2, fmt.Sprintf(format, args...))
}
// Log a message associated with an ongoing request
func (s *Server) Logr(request *http.Request, format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
dn := GetClientDN(request)
if dn != "" {
dn = " `" + dn + "`"
}
msg2 := fmt.Sprintf("[%s \"%s\"%s] %s", GetClientIP(request), GetClientName(request), dn, msg)
s.ErrorLog.Output(2, msg2)
}
// Log an unhandled error with optional traceback
func (s *Server) LogError(request *http.Request, err interface{}, traceback []byte) Response {
msg := ""
if len(traceback) != 0 {
msg = "\n " + strings.Replace(string(traceback), "\n", "\n ", -1)
}
s.Logr(request, "unhandled exception: %s%s\n", err, msg)
return ErrorResponse(http.StatusInternalServerError)
}
// Wraps a http.ResponseWriter and writes an access log entry on completion
type loggingWriter struct {
http.ResponseWriter
s *Server
r *http.Request
st time.Time
wrote bool
length int64
status int
}
func (lw *loggingWriter) WriteHeader(status int) {
lw.wrote = true
lw.status = status
lw.ResponseWriter.WriteHeader(status)
}
func (lw *loggingWriter) Write(d []byte) (int, error) {
if !lw.wrote {
lw.WriteHeader(http.StatusOK)
}
n, err := lw.ResponseWriter.Write(d)
lw.length += int64(n)
return n, err
}
func (lw *loggingWriter) Close() {
path := lw.r.URL.Path
if path == "/health" {
// don't log health check spam
return
}
ua := lw.r.Header.Get("User-Agent")
if ua == "" {
ua = "-"
}
elapsed := time.Since(lw.st)
lw.s.Logr(lw.r, "%s \"%s\" %d %d %s %.03f", lw.r.Method, lw.r.URL, lw.status, lw.length, ua, elapsed.Seconds())
}