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// Copyright (C) 2016 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 (
"bytes"
"os"
"time"
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/packet/mrt"
)
type mrtWriter struct {
dead chan struct{}
s *BgpServer
filename string
file *os.File
interval uint64
}
func (m *mrtWriter) Stop() {
close(m.dead)
}
func (m *mrtWriter) loop() error {
w := m.s.Watch(WatchUpdate(false))
c := func() *time.Ticker {
if m.interval == 0 {
return &time.Ticker{}
}
return time.NewTicker(time.Second * time.Duration(m.interval))
}()
defer func() {
if m.file != nil {
m.file.Close()
}
if m.interval != 0 {
c.Stop()
}
w.Stop()
}()
for {
serialize := func(ev WatchEvent) ([]byte, error) {
m := ev.(*WatchEventUpdate)
subtype := mrt.MESSAGE_AS4
mp := mrt.NewBGP4MPMessage(m.PeerAS, m.LocalAS, 0, m.PeerAddress.String(), m.LocalAddress.String(), m.FourBytesAs, nil)
mp.BGPMessagePayload = m.Payload
if m.FourBytesAs == false {
subtype = mrt.MESSAGE
}
bm, err := mrt.NewMRTMessage(uint32(m.Timestamp.Unix()), mrt.BGP4MP, subtype, mp)
if err != nil {
log.WithFields(log.Fields{
"Topic": "mrt",
"Data": m,
}).Warn(err)
return nil, err
}
return bm.Serialize()
}
drain := func(ev WatchEvent) {
events := make([]WatchEvent, 0, 1+len(w.Event()))
if ev != nil {
events = append(events, ev)
}
for len(w.Event()) > 0 {
events = append(events, <-w.Event())
}
w := func(buf []byte) {
if _, err := m.file.Write(buf); err == nil {
m.file.Sync()
} else {
log.WithFields(log.Fields{
"Topic": "mrt",
"Error": err,
}).Warn(err)
}
}
var b bytes.Buffer
for _, e := range events {
buf, err := serialize(e)
if err != nil {
log.WithFields(log.Fields{
"Topic": "mrt",
"Data": e,
}).Warn(err)
continue
}
b.Write(buf)
if b.Len() > 1*1000*1000 {
w(b.Bytes())
b.Reset()
}
}
if b.Len() > 0 {
w(b.Bytes())
}
}
select {
case <-m.dead:
drain(nil)
return nil
case e := <-w.Event():
drain(e)
case <-c.C:
m.file.Close()
file, err := mrtFileOpen(m.filename, m.interval)
if err == nil {
m.file = file
} else {
log.Info("can't rotate mrt file", err)
}
}
}
}
func mrtFileOpen(filename string, interval uint64) (*os.File, error) {
realname := filename
if interval != 0 {
realname = time.Now().Format(filename)
}
i := len(realname)
for i > 0 && os.IsPathSeparator(realname[i-1]) {
// skip trailing path separators
i--
}
j := i
for j > 0 && !os.IsPathSeparator(realname[j-1]) {
j--
}
if j > 0 {
if err := os.MkdirAll(realname[0:j-1], 0755); err != nil {
log.Warn(err)
return nil, err
}
}
file, err := os.OpenFile(realname, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0644)
if err != nil {
log.Warn(err)
}
return file, err
}
func newMrtWriter(s *BgpServer, dumpType int, filename string, interval uint64) (*mrtWriter, error) {
file, err := mrtFileOpen(filename, interval)
if err != nil {
return nil, err
}
m := mrtWriter{
s: s,
filename: filename,
file: file,
interval: interval,
}
go m.loop()
return &m, nil
}
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