85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
// Copyright 2018 The Go Cloud Development Kit Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package requestlog
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import (
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"io"
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"strconv"
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"sync"
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)
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// An NCSALogger writes log entries to an io.Writer in the
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// Combined Log Format.
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//
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// Details at http://httpd.apache.org/docs/current/logs.html#combined
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type NCSALogger struct {
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onErr func(error)
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mu sync.Mutex
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w io.Writer
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buf []byte
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}
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// NewNCSALogger returns a new logger that writes to w.
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// A nil onErr is treated the same as func(error) {}.
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func NewNCSALogger(w io.Writer, onErr func(error)) *NCSALogger {
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return &NCSALogger{
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w: w,
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onErr: onErr,
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}
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}
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// Log writes an entry line to its writer. Multiple concurrent calls
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// will produce sequential writes to its writer.
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func (l *NCSALogger) Log(ent *Entry) {
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if err := l.log(ent); err != nil && l.onErr != nil {
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l.onErr(err)
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}
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}
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func (l *NCSALogger) log(ent *Entry) error {
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defer l.mu.Unlock()
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l.mu.Lock()
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l.buf = formatEntry(l.buf[:0], ent)
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_, err := l.w.Write(l.buf)
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return err
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}
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func formatEntry(b []byte, ent *Entry) []byte {
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const ncsaTime = "02/Jan/2006:15:04:05 -0700"
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if ent.RemoteIP == "" {
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b = append(b, '-')
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} else {
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b = append(b, ent.RemoteIP...)
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}
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b = append(b, " - - ["...)
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b = ent.ReceivedTime.AppendFormat(b, ncsaTime)
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b = append(b, "] \""...)
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b = append(b, ent.RequestMethod...)
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b = append(b, ' ')
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b = append(b, ent.RequestURL...)
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b = append(b, ' ')
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b = append(b, ent.Proto...)
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b = append(b, "\" "...)
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b = strconv.AppendInt(b, int64(ent.Status), 10)
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b = append(b, ' ')
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b = strconv.AppendInt(b, int64(ent.ResponseBodySize), 10)
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b = append(b, ' ')
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b = strconv.AppendQuote(b, ent.Referer)
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b = append(b, ' ')
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b = strconv.AppendQuote(b, ent.UserAgent)
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b = append(b, '\n')
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return b
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}
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