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008160998a
The errors and logs can now have log rolling if provided by the user. The current customisable parameter of it are: The maximal size of the file before rolling. The maximal age/time of the file before rolling. The number of backups to keep.
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// Package log implements basic but useful request (access) logging middleware.
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package log
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import (
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"fmt"
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"log"
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"net/http"
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"github.com/mholt/caddy/middleware"
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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 middleware.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 middleware.Path(r.URL.Path).Matches(rule.PathScope) {
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responseRecorder := middleware.NewResponseRecorder(w)
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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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rep := middleware.NewReplacer(r, responseRecorder, CommonLogEmptyValue)
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rule.Log.Println(rep.Replace(rule.Format))
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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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// Rule configures the logging middleware.
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type Rule struct {
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PathScope string
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OutputFile string
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Format string
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Log *log.Logger
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Roller *middleware.LogRoller
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}
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const (
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DefaultLogFilename = "access.log"
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CommonLogFormat = `{remote} ` + CommonLogEmptyValue + ` [{when}] "{method} {uri} {proto}" {status} {size}`
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CommonLogEmptyValue = "-"
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CombinedLogFormat = CommonLogFormat + ` "{>Referer}" "{>User-Agent}"`
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DefaultLogFormat = CommonLogFormat
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)
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