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ncsa.go
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ncsa.go
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// Copyright 2018 The Go Cloud Development Kit Authors
//
// 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
//
// https://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 requestlog
import (
"io"
"strconv"
"sync"
)
// An NCSALogger writes log entries to an io.Writer in the
// Combined Log Format.
//
// Details at http://httpd.apache.org/docs/current/logs.html#combined
type NCSALogger struct {
onErr func(error)
mu sync.Mutex
w io.Writer
buf []byte
}
// NewNCSALogger returns a new logger that writes to w.
// A nil onErr is treated the same as func(error) {}.
func NewNCSALogger(w io.Writer, onErr func(error)) *NCSALogger {
return &NCSALogger{
w: w,
onErr: onErr,
}
}
// Log writes an entry line to its writer. Multiple concurrent calls
// will produce sequential writes to its writer.
func (l *NCSALogger) Log(ent *Entry) {
if err := l.log(ent); err != nil && l.onErr != nil {
l.onErr(err)
}
}
func (l *NCSALogger) log(ent *Entry) error {
defer l.mu.Unlock()
l.mu.Lock()
l.buf = formatEntry(l.buf[:0], ent)
_, err := l.w.Write(l.buf)
return err
}
func formatEntry(b []byte, ent *Entry) []byte {
const ncsaTime = "02/Jan/2006:15:04:05 -0700"
if ent.RemoteIP == "" {
b = append(b, '-')
} else {
b = append(b, ent.RemoteIP...)
}
b = append(b, " - - ["...)
b = ent.ReceivedTime.AppendFormat(b, ncsaTime)
b = append(b, "] \""...)
b = append(b, ent.RequestMethod...)
b = append(b, ' ')
b = append(b, ent.RequestURL...)
b = append(b, ' ')
b = append(b, ent.Proto...)
b = append(b, "\" "...)
b = strconv.AppendInt(b, int64(ent.Status), 10)
b = append(b, ' ')
b = strconv.AppendInt(b, int64(ent.ResponseBodySize), 10)
b = append(b, ' ')
b = strconv.AppendQuote(b, ent.Referer)
b = append(b, ' ')
b = strconv.AppendQuote(b, ent.UserAgent)
b = append(b, '\n')
return b
}