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handlers.go
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/
handlers.go
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package castcenter
import (
"crypto/md5"
"encoding/hex"
"net"
"time"
"github.com/sirupsen/logrus"
)
// Run .
func (c *CastCenter) Run() {
if err := c.heartbeat(); err != nil {
logrus.Fatal(err)
}
go recoverLoop(c.startReceive)
go recoverLoop(c.startSend)
c.loop()
}
func (c *CastCenter) loop() {
tick := time.NewTicker(c.clusterHeartbeat)
for {
select {
case <-tick.C:
c.heartbeat()
}
}
}
func (c *CastCenter) startReceive() {
addr, err := net.ResolveUDPAddr("udp", c.serviceAddr)
if err != nil {
logrus.Fatal(err)
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
logrus.Fatal(err)
}
if err := NewUDPServer(c.handleReceive, c.chanSize).ListenUDP(conn); err != nil {
logrus.Fatal(err)
}
}
func (c *CastCenter) handleReceive(event *UDPEvent) {
if !c.GetClusterStatus().SubNetLeader {
return
}
hashed := md5.Sum(event.buf)
c.cache.Set(string(hashed[:]), 1, time.Second)
logrus.Debugf("receive: len= %d content= %s", len(event.buf), hex.Dump(event.buf))
c.multicastConn.Write(event.buf)
}
func (c *CastCenter) startSend() {
addr, err := net.ResolveUDPAddr("udp", c.multicastAddr)
if err != nil {
logrus.Fatal(err)
}
conn, err := net.ListenMulticastUDP("udp", nil, addr)
if err != nil {
logrus.Fatal(err)
}
if err := NewUDPServer(c.handleSend, c.chanSize).ListenUDP(conn); err != nil {
logrus.Fatal(err)
}
}
func (c *CastCenter) handleSend(event *UDPEvent) {
if event.ip != netinfo.IP {
return
}
hashed := md5.Sum(event.buf)
if _, ok := c.cache.Get(string(hashed[:])); ok {
return
}
hexstr := hex.Dump(event.buf)
for host, conn := range c.GetClusterStatus().Conns {
logrus.Debugf("send to %s: len= %d content= %s", host, len(event.buf), hexstr)
conn.Write(event.buf)
}
}