1 files changed, 145 insertions, 0 deletions
diff --git a/server/watcher.go b/server/watcher.go
new file mode 100644
index 00000000..a4c3a192
--- /dev/null
+++ b/server/watcher.go
@@ -0,0 +1,145 @@
+// Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+// implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import (
+	log "github.com/Sirupsen/logrus"
+	"github.com/osrg/gobgp/packet"
+	"gopkg.in/tomb.v2"
+	"net"
+	"os"
+	"time"
+)
+
+type broadcastWatcherMsg struct {
+	ch    chan watcherEvent
+	event watcherEvent
+}
+
+func (m *broadcastWatcherMsg) send() {
+	m.ch <- m.event
+}
+
+type watcherType uint8
+
+const (
+	_           watcherType = iota
+	WATCHER_MRT             // UPDATE MSG
+	WATCHER_BMP
+	WATCHER_ZEBRA
+	WATCHER_GRPC_BESTPATH
+)
+
+type watcherEventType uint8
+
+const (
+	_ watcherEventType = iota
+	WATCHER_EVENT_UPDATE_MSG
+	WATCHER_EVENT_STATE_CHANGE
+	WATCHER_EVENT_BESTPATH_CHANGE
+)
+
+type watcherEvent interface {
+}
+
+type watcherEventUpdateMsg struct {
+	message      *bgp.BGPMessage
+	peerAS       uint32
+	localAS      uint32
+	peerAddress  net.IP
+	localAddress net.IP
+	fourBytesAs  bool
+}
+
+type watcher interface {
+	notify(watcherEventType) chan watcherEvent
+	stop()
+}
+
+type mrtWatcher struct {
+	t        tomb.Tomb
+	filename string
+	file     *os.File
+	ch       chan watcherEvent
+}
+
+func (w *mrtWatcher) notify(t watcherEventType) chan watcherEvent {
+	if t == WATCHER_EVENT_UPDATE_MSG {
+		return w.ch
+	}
+	return nil
+}
+
+func (w *mrtWatcher) stop() {
+	w.t.Kill(nil)
+}
+
+func (w *mrtWatcher) loop() error {
+	for {
+		write := func(ev watcherEvent) {
+			m := ev.(*watcherEventUpdateMsg)
+			subtype := bgp.MESSAGE_AS4
+			mp := bgp.NewBGP4MPMessage(m.peerAS, m.localAS, 0, m.peerAddress.String(), m.localAddress.String(), m.fourBytesAs, m.message)
+			if m.fourBytesAs == false {
+				subtype = bgp.MESSAGE
+			}
+			bm, err := bgp.NewMRTMessage(uint32(time.Now().Unix()), bgp.BGP4MP, subtype, mp)
+			if err != nil {
+				log.WithFields(log.Fields{
+					"Topic": "mrt",
+					"Data":  m,
+				}).Warn(err)
+				return
+			}
+			buf, err := bm.Serialize()
+			if err == nil {
+				_, err = w.file.Write(buf)
+			}
+
+			if err != nil {
+				log.WithFields(log.Fields{
+					"Topic": "mrt",
+					"Data":  m,
+				}).Warn(err)
+			}
+		}
+
+		select {
+		case <-w.t.Dying():
+			for len(w.ch) > 0 {
+				m := <-w.ch
+				write(m)
+			}
+			return nil
+		case m := <-w.ch:
+			write(m)
+		}
+	}
+}
+
+func newMrtWatcher(filename string) (*mrtWatcher, error) {
+	file, err := os.OpenFile(filename, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+	w := mrtWatcher{
+		filename: filename,
+		file:     file,
+		ch:       make(chan watcherEvent),
+	}
+	w.t.Go(w.loop)
+	return &w, nil
+}