mirror of
https://github.com/coredns/coredns.git
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80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
// Package errors implements an HTTP error handling plugin.
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package errors
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import (
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"context"
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"fmt"
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"log"
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"runtime"
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"strings"
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"time"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/request"
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"github.com/miekg/dns"
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)
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// errorHandler handles DNS errors (and errors from other plugin).
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type errorHandler struct {
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Next plugin.Handler
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LogFile string
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Log *log.Logger
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}
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// ServeDNS implements the plugin.Handler interface.
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func (h errorHandler) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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defer h.recovery(ctx, w, r)
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rcode, err := plugin.NextOrFailure(h.Name(), h.Next, ctx, w, r)
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if err != nil {
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state := request.Request{W: w, Req: r}
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errMsg := fmt.Sprintf("%s [ERROR %d %s %s] %v", time.Now().Format(timeFormat), rcode, state.Name(), state.Type(), err)
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h.Log.Println(errMsg)
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}
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return rcode, err
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}
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func (h errorHandler) Name() string { return "errors" }
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func (h errorHandler) recovery(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) {
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rec := recover()
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if rec == nil {
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return
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}
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// Obtain source of panic
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// From: https://gist.github.com/swdunlop/9629168
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var name, file string // function name, file name
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var line int
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var pc [16]uintptr
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n := runtime.Callers(3, pc[:])
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for _, pc := range pc[:n] {
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fn := runtime.FuncForPC(pc)
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if fn == nil {
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continue
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}
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file, line = fn.FileLine(pc)
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name = fn.Name()
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if !strings.HasPrefix(name, "runtime.") {
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break
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}
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}
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// Trim file path
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delim := "/coredns/"
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pkgPathPos := strings.Index(file, delim)
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if pkgPathPos > -1 && len(file) > pkgPathPos+len(delim) {
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file = file[pkgPathPos+len(delim):]
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}
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panicMsg := fmt.Sprintf("%s [PANIC %s %s] %s:%d - %v", time.Now().Format(timeFormat), r.Question[0].Name, dns.Type(r.Question[0].Qtype), file, line, rec)
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// Currently we don't use the function name, since file:line is more conventional
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h.Log.Printf(panicMsg)
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}
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const timeFormat = "02/Jan/2006:15:04:05 -0700"
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