First commit

middleware/log/log.go

@@ -0,0 +1,66 @@
+// Package log implements basic but useful request (access) logging middleware.
+package log
+
+import (
+	"log"
+
+	"github.com/miekg/coredns/middleware"
+	"github.com/miekg/dns"
+)
+
+// Logger is a basic request logging middleware.
+type Logger struct {
+	Next      middleware.Handler
+	Rules     []Rule
+	ErrorFunc func(dns.ResponseWriter, *dns.Msg, int) // failover error handler
+}
+
+func (l Logger) ServeDNS(w dns.ResponseWriter, r *dns.Msg) (int, error) {
+	for _, rule := range l.Rules {
+		/*
+			if middleware.Path(r.URL.Path).Matches(rule.PathScope) {
+				responseRecorder := middleware.NewResponseRecorder(w)
+				status, err := l.Next.ServeHTTP(responseRecorder, r)
+				if status >= 400 {
+					// There was an error up the chain, but no response has been written yet.
+					// The error must be handled here so the log entry will record the response size.
+					if l.ErrorFunc != nil {
+						l.ErrorFunc(responseRecorder, r, status)
+					} else {
+						// Default failover error handler
+						responseRecorder.WriteHeader(status)
+						fmt.Fprintf(responseRecorder, "%d %s", status, http.StatusText(status))
+					}
+					status = 0
+				}
+				rep := middleware.NewReplacer(r, responseRecorder, CommonLogEmptyValue)
+				rule.Log.Println(rep.Replace(rule.Format))
+				return status, err
+			}
+		*/
+		rule = rule
+	}
+	return l.Next.ServeDNS(w, r)
+}
+
+// Rule configures the logging middleware.
+type Rule struct {
+	PathScope  string
+	OutputFile string
+	Format     string
+	Log        *log.Logger
+	Roller     *middleware.LogRoller
+}
+
+const (
+	// DefaultLogFilename is the default log filename.
+	DefaultLogFilename = "access.log"
+	// CommonLogFormat is the common log format.
+	CommonLogFormat = `{remote} ` + CommonLogEmptyValue + ` [{when}] "{type} {name} {proto}" {rcode} {size}`
+	// CommonLogEmptyValue is the common empty log value.
+	CommonLogEmptyValue = "-"
+	// CombinedLogFormat is the combined log format.
+	CombinedLogFormat = CommonLogFormat + ` "{>Referer}" "{>User-Agent}"` // Something here as well
+	// DefaultLogFormat is the default log format.
+	DefaultLogFormat = CommonLogFormat
+)