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udpjson.go
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udpjson.go
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package udpjson
import (
"encoding/json"
"net"
"packetbeat/common"
"packetbeat/config"
"packetbeat/logp"
"time"
)
type Config struct {
Port int
BindIp string
Timeout time.Duration
}
type Udpjson struct {
Config
events chan common.MapStr
isAlive bool
conn *net.UDPConn
}
func (server *Udpjson) Run() error {
buf := make([]byte, 65535)
for server.isAlive {
err := server.conn.SetDeadline(time.Now().Add(server.Config.Timeout))
if err != nil {
logp.Err("SetDeadline: %v", err)
return err
}
n, _, err := server.conn.ReadFromUDP(buf)
if err != nil {
if err.(net.Error).Timeout() {
continue
}
logp.Err("ReadFromUDP: %v", err)
return err
}
logp.Debug("udpjson", "Read from socket: %s", string(buf[:n]))
var obj common.MapStr
err = json.Unmarshal(buf[:n], &obj)
if err != nil {
logp.Warn("json.Unmarshal failed: %v", err)
continue
}
err = obj.EnsureTimestampField(time.Now)
if err != nil {
logp.Err("Invalid timestamp field: %v", err)
continue
}
server.events <- obj
}
return nil
}
func (server *Udpjson) setFromConfig() error {
var cfg Config
if len(config.ConfigSingleton.Udpjson.Bind_ip) > 0 {
cfg.BindIp = config.ConfigSingleton.Udpjson.Bind_ip
} else {
cfg.BindIp = "127.0.0.1"
}
if config.ConfigSingleton.Udpjson.Port > 0 {
cfg.Port = config.ConfigSingleton.Udpjson.Port
} else {
cfg.Port = 9712
}
if config.ConfigSingleton.Udpjson.Timeout > 0 {
cfg.Timeout = time.Duration(config.ConfigSingleton.Udpjson.Timeout) * time.Millisecond
} else {
cfg.Timeout = 10 * time.Millisecond
}
server.Config = cfg
return nil
}
func (server *Udpjson) Init(test_mode bool, events chan common.MapStr) error {
if !test_mode {
err := server.setFromConfig()
if err != nil {
return err
}
}
server.events = events
addr := net.UDPAddr{
Port: server.Config.Port,
IP: net.ParseIP(server.Config.BindIp),
}
var err error
server.conn, err = net.ListenUDP("udp", &addr)
if err != nil {
return err
}
server.isAlive = true
logp.Info("UDPJson plugin listening on %s:%d", addr.IP, addr.Port)
return nil
}
func (server *Udpjson) Stop() error {
server.isAlive = false
return nil
}
func (server *Udpjson) Close() error {
return server.conn.Close()
}
func (server *Udpjson) IsAlive() bool {
return server.isAlive
}