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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"
"net"
"sync"
"time"
log "github.com/Sirupsen/logrus"
"github.com/eapache/channels"
"github.com/osrg/gobgp/packet/bgp"
"github.com/osrg/gobgp/table"
"gopkg.in/tomb.v2"
)
type watcherType uint8
const (
_ watcherType = iota
WATCHER_MRT // UPDATE MSG
WATCHER_BMP
WATCHER_ZEBRA
WATCHER_COLLECTOR
WATCHER_GRPC_MONITOR
)
type watcherEventType uint8
const (
_ watcherEventType = iota
WATCHER_EVENT_UPDATE_MSG
WATCHER_EVENT_STATE_CHANGE
WATCHER_EVENT_BESTPATH_CHANGE
WATCHER_EVENT_POST_POLICY_UPDATE_MSG
WATCHER_EVENT_ADJ_IN
)
type watcherEvent interface {
}
type watcherEventUpdateMsg struct {
message *bgp.BGPMessage
peerAS uint32
localAS uint32
peerAddress net.IP
localAddress net.IP
peerID net.IP
fourBytesAs bool
timestamp time.Time
payload []byte
postPolicy bool
pathList []*table.Path
}
type watcherEventStateChangedMsg struct {
peerAS uint32
localAS uint32
peerAddress net.IP
localAddress net.IP
peerPort uint16
localPort uint16
peerID net.IP
sentOpen *bgp.BGPMessage
recvOpen *bgp.BGPMessage
state bgp.FSMState
adminState AdminState
timestamp time.Time
}
type watcherEventAdjInMsg struct {
pathList []*table.Path
}
type watcherEventBestPathMsg struct {
pathList []*table.Path
multiPathList [][]*table.Path
}
type watcher interface {
notify(watcherEventType) chan watcherEvent
restart(string) error
stop()
watchingEventTypes() []watcherEventType
}
type watcherMsg struct {
typ watcherEventType
ev watcherEvent
}
type watcherManager struct {
t tomb.Tomb
mu sync.RWMutex
m map[watcherType]watcher
ch *channels.InfiniteChannel
}
func (m *watcherManager) watching(typ watcherEventType) bool {
for _, w := range m.m {
for _, ev := range w.watchingEventTypes() {
if ev == typ {
return true
}
}
}
return false
}
// this will be called from server's main goroutine.
// shouldn't block.
func (m *watcherManager) notify(typ watcherEventType, ev watcherEvent) {
m.ch.In() <- &watcherMsg{typ, ev}
}
func (m *watcherManager) loop() error {
for {
select {
case i, ok := <-m.ch.Out():
if !ok {
continue
}
msg := i.(*watcherMsg)
m.mu.RLock()
for _, w := range m.m {
if ch := w.notify(msg.typ); ch != nil {
t := time.NewTimer(time.Second)
select {
case ch <- msg.ev:
case <-t.C:
log.WithFields(log.Fields{
"Topic": "Watcher",
}).Warnf("notification to %s timeout expired")
}
}
}
m.mu.RUnlock()
}
}
}
func (m *watcherManager) watcher(typ watcherType) (watcher, bool) {
m.mu.RLock()
defer m.mu.RUnlock()
w, y := m.m[typ]
return w, y
}
func (m *watcherManager) addWatcher(typ watcherType, w watcher) error {
m.mu.Lock()
defer m.mu.Unlock()
if _, y := m.m[typ]; y {
return fmt.Errorf("already exists %s watcher", typ)
}
m.m[typ] = w
return nil
}
func (m *watcherManager) delWatcher(typ watcherType) error {
m.mu.Lock()
defer m.mu.Unlock()
if _, y := m.m[typ]; !y {
return fmt.Errorf("not found %s watcher", typ)
}
w := m.m[typ]
w.stop()
delete(m.m, typ)
return nil
}
func newWatcherManager() *watcherManager {
m := &watcherManager{
m: make(map[watcherType]watcher),
ch: channels.NewInfiniteChannel(),
}
m.t.Go(m.loop)
return m
}
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