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// 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 (
"fmt"
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
timestamp time.Time
}
type watcher interface {
notify(watcherEventType) chan watcherEvent
restart(string) error
stop()
}
type mrtWatcherOp struct {
filename string //used for rotate
result chan error
}
type mrtWatcher struct {
t tomb.Tomb
filename string
file *os.File
ch chan watcherEvent
opCh chan *mrtWatcherOp
}
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) restart(filename string) error {
adminOp := &mrtWatcherOp{
filename: filename,
result: make(chan error),
}
select {
case w.opCh <- adminOp:
default:
return fmt.Errorf("already an admin operaiton in progress")
}
return <-adminOp.result
}
func (w *mrtWatcher) loop() error {
defer w.file.Close()
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(m.timestamp.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)
}
}
drain := func() {
for len(w.ch) > 0 {
m := <-w.ch
write(m)
}
}
select {
case <-w.t.Dying():
drain()
return nil
case m := <-w.ch:
write(m)
case adminOp := <-w.opCh:
var err error
if adminOp.filename != "" {
err = os.Rename(w.file.Name(), adminOp.filename)
}
if err == nil {
var file *os.File
file, err = mrtFileOpen(w.file.Name())
if err == nil {
w.file.Close()
w.file = file
}
}
adminOp.result <- err
}
}
}
func mrtFileOpen(filename string) (*os.File, error) {
file, err := os.OpenFile(filename, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0644)
if err != nil {
log.Warn(err)
}
return file, err
}
func newMrtWatcher(filename string) (*mrtWatcher, error) {
file, err := mrtFileOpen(filename)
if err != nil {
return nil, err
}
w := mrtWatcher{
filename: filename,
file: file,
ch: make(chan watcherEvent),
opCh: make(chan *mrtWatcherOp, 1),
}
w.t.Go(w.loop)
return &w, nil
}
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