mirror of
https://github.com/caddyserver/caddy.git
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102 lines
3.0 KiB
Go
102 lines
3.0 KiB
Go
// Copyright 2015 Light Code Labs, LLC
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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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// http://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 log implements request (access) logging middleware.
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package log
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import (
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"fmt"
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"net/http"
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"github.com/mholt/caddy"
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"github.com/mholt/caddy/caddyhttp/httpserver"
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)
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func init() {
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caddy.RegisterPlugin("log", caddy.Plugin{
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ServerType: "http",
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Action: setup,
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})
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}
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// Logger is a basic request logging middleware.
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type Logger struct {
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Next httpserver.Handler
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Rules []*Rule
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ErrorFunc func(http.ResponseWriter, *http.Request, int) // failover error handler
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}
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func (l Logger) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
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for _, rule := range l.Rules {
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if httpserver.Path(r.URL.Path).Matches(rule.PathScope) {
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// Record the response
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responseRecorder := httpserver.NewResponseRecorder(w)
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// Attach the Replacer we'll use so that other middlewares can
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// set their own placeholders if they want to.
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rep := httpserver.NewReplacer(r, responseRecorder, CommonLogEmptyValue)
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responseRecorder.Replacer = rep
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// Bon voyage, request!
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status, err := l.Next.ServeHTTP(responseRecorder, r)
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if status >= 400 {
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// There was an error up the chain, but no response has been written yet.
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// The error must be handled here so the log entry will record the response size.
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if l.ErrorFunc != nil {
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l.ErrorFunc(responseRecorder, r, status)
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} else {
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// Default failover error handler
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responseRecorder.WriteHeader(status)
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fmt.Fprintf(responseRecorder, "%d %s", status, http.StatusText(status))
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}
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status = 0
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}
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// Write log entries
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for _, e := range rule.Entries {
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e.Log.Println(rep.Replace(e.Format))
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}
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return status, err
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}
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}
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return l.Next.ServeHTTP(w, r)
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}
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// Entry represents a log entry under a path scope
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type Entry struct {
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Format string
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Log *httpserver.Logger
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}
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// Rule configures the logging middleware.
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type Rule struct {
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PathScope string
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Entries []*Entry
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}
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const (
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// DefaultLogFilename is the default log filename.
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DefaultLogFilename = "access.log"
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// CommonLogFormat is the common log format.
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CommonLogFormat = `{remote} ` + CommonLogEmptyValue + ` {user} [{when}] "{method} {uri} {proto}" {status} {size}`
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// CommonLogEmptyValue is the common empty log value.
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CommonLogEmptyValue = "-"
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// CombinedLogFormat is the combined log format.
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CombinedLogFormat = CommonLogFormat + ` "{>Referer}" "{>User-Agent}"`
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// DefaultLogFormat is the default log format.
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DefaultLogFormat = CommonLogFormat
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)
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