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natsLinker.go
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natsLinker.go
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package linker
import (
"os"
"strconv"
"github.com/wmyi/gn/config"
logger "github.com/wmyi/gn/glog"
"github.com/wmyi/gn/gnError"
"github.com/nats-io/nats.go"
)
type natsLinker struct {
natsC *nats.Conn
CWChan chan []byte
natsConf *config.Natsconfig
serverID string
natsClientId uint64
isRuning bool
exDetect *gnError.GnExceptionDetect
}
func NewNatsClient(serverId string, natsConf *config.Natsconfig, outChan chan []byte,
detect *gnError.GnExceptionDetect) *natsLinker {
nats := &natsLinker{
CWChan: outChan,
natsConf: natsConf,
serverID: serverId,
isRuning: false,
exDetect: detect,
}
return nats
}
func (nl *natsLinker) Done() {
if nl.natsC.IsConnected() {
defer nl.natsC.Close()
defer nl.natsC.Flush()
}
if nl.isRuning {
nl.isRuning = false
}
}
func (nl *natsLinker) natsDisconnectHandler(con *nats.Conn) {
nl.exDetect.ThrowException(&gnError.GnException{
Id: nl.serverID,
Exception: gnError.NATS_DISCONNECT,
Msg: "Nats connection DisconnectErrException will set the disconnect event handler.",
})
}
func (nl *natsLinker) natsClosedHandler(con *nats.Conn) {
nl.exDetect.ThrowException(&gnError.GnException{
Id: nl.serverID,
Exception: gnError.NATS_CLOSED,
Msg: "Nats connection ClosedException will set the reconnect event handler.",
})
}
func (nl *natsLinker) natsDiscoveredServersHandler(con *nats.Conn) {
nl.exDetect.ThrowException(&gnError.GnException{
Id: nl.serverID,
Exception: gnError.NATS_DISCOVERED,
Msg: "Nats connection DiscoveredServersException will set the discovered servers handler.",
})
}
func (nl *natsLinker) natsDisconnectErrHandler(con *nats.Conn, err error) {
nl.exDetect.ThrowException(&gnError.GnException{
Id: nl.serverID,
Exception: gnError.NATS__DISCONNECTERR,
Msg: "Nats connection DisconnectErrException will set the disconnect event handler.",
})
}
func (nl *natsLinker) natsErrorHandler(*nats.Conn, *nats.Subscription, error) {
nl.exDetect.ThrowException(&gnError.GnException{
Id: nl.serverID,
Exception: gnError.NATS_ERRORHANDLER,
Msg: "Nats connection ErrorException will set the async error handler.",
})
}
func (nl *natsLinker) natsReconnectHandler(con *nats.Conn) {
nl.exDetect.ThrowException(&gnError.GnException{
Id: nl.serverID,
Exception: gnError.NATS_RECONNECT,
Msg: "Nats connection ReconnectException will set the reconnect event handler.",
})
}
func (nl *natsLinker) GetConnection() interface{} {
return nl.natsC
}
func (nl *natsLinker) Run() error {
if nl.natsC == nil && !nl.isRuning {
var address string
address = os.Getenv("NATS_URI")
if len(address) <= 0 {
address = nl.natsConf.Host + ":" + strconv.Itoa(nl.natsConf.Port)
}
connect, err := nats.Connect(address)
if err != nil {
logger.Errorf("nats connect ", err)
return err
}
nl.natsC = connect
// set handler
nl.natsC.SetClosedHandler(nl.natsClosedHandler)
nl.natsC.SetDisconnectErrHandler(nl.natsDisconnectErrHandler)
nl.natsC.SetDisconnectHandler(nl.natsDisconnectHandler)
nl.natsC.SetDiscoveredServersHandler(nl.natsDiscoveredServersHandler)
nl.natsC.SetErrorHandler(nl.natsErrorHandler)
nl.natsC.SetReconnectHandler(nl.natsReconnectHandler)
err = nl.initNats()
if err != nil {
return err
}
nl.isRuning = true
return nil
} else {
return gnError.ErrLinkerRuning
}
}
func (nl *natsLinker) SendMsg(router string, data []byte) {
if nl.natsC != nil {
err := nl.natsC.Publish(router, data)
if err != nil {
logger.Errorf("natsLinker sendMsg error ", err)
nl.exDetect.ThrowException(&gnError.GnException{
Id: nl.serverID,
Exception: gnError.NATS_SENDERROR,
Msg: err.Error(),
})
}
}
}
func (nl *natsLinker) GetSubRounter() string {
return nl.serverID
}
func (nl *natsLinker) initNats() error {
if nl.natsC != nil {
_, err := nl.natsC.Subscribe(nl.GetSubRounter(), func(msg *nats.Msg) {
logger.Infof("nats receive msg %s \n", string(msg.Data))
nl.CWChan <- msg.Data
})
if err != nil {
nl.Done()
logger.Errorf("nats subscribe error %v", err)
return err
}
nl.natsClientId, err = nl.natsC.GetClientID()
if err == nil {
logger.Infof("natsLinker Run done urls: %v clientId: %d Subscribe: %s ", nl.natsC.Servers(), nl.natsClientId, nl.GetSubRounter())
} else {
return err
}
}
return nil
}