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service_manager.go
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service_manager.go
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package core
import (
"context"
"errors"
"math/rand"
"strings"
"sync/atomic"
"time"
"github.com/panco95/go-garden/core/log"
clientV3 "go.etcd.io/etcd/client/v3"
)
type node struct {
Addr string
Waiting int64
Finish int64
}
type service struct {
Nodes []node
}
type serviceOperate struct {
operate string
serviceName string
serviceAddr string
nodeIndex int
}
//GetServices get all cluster service map by etcdKey
func (g *Garden) GetServices() map[string]*service {
return g.services
}
//GetServiceIp get this service ip
func (g *Garden) GetServiceIp() string {
return g.cfg.Service.ServiceIp
}
//GetServiceId get this service union id
func (g *Garden) GetServiceId() string {
return g.cfg.Service.EtcdKey + "_" + g.cfg.Service.ServiceName + "_" + g.cfg.Service.ServiceIp + ":" + g.cfg.Service.HttpPort + ":" + g.cfg.Service.RpcPort
}
func (g *Garden) bootService() {
var err error
g.services = map[string]*service{}
if g.cfg.Service.ServiceIp == "" {
g.cfg.Service.ServiceIp, err = getOutboundIP()
if err != nil {
log.Fatal("bootService", err)
}
}
g.serviceManager = make(chan serviceOperate, 0)
go g.serviceManageWatch(g.serviceManager)
if err = g.serviceRegister(true); err != nil {
log.Fatal("serviceRegister", err)
}
}
func (g *Garden) serviceRegister(isReconnect bool) error {
client, err := g.GetEtcd()
if err != nil {
return err
}
// New lease
resp, err := client.Grant(context.TODO(), 2)
if err != nil {
return err
}
// The lease was granted
if err != nil {
return err
}
_, err = client.Put(context.TODO(), g.GetServiceId(), "0", clientV3.WithLease(resp.ID))
if err != nil {
return err
}
// keep alive
ch, err := client.KeepAlive(context.TODO(), resp.ID)
if err != nil {
return err
}
// monitor etcd connection
go func() {
for {
select {
case resp := <-ch:
if resp == nil {
go g.serviceRegister(false)
return
}
}
}
}()
if isReconnect {
go g.serviceWatcher()
go func() {
for {
g.getAllServices()
time.Sleep(time.Second * 5)
}
}()
}
return nil
}
func (g *Garden) serviceWatcher() {
client, err := g.GetEtcd()
if err != nil {
log.Error("getEtcd", err)
return
}
rch := client.Watch(context.Background(), g.cfg.Service.EtcdKey+"_", clientV3.WithPrefix())
for wresp := range rch {
for _, ev := range wresp.Events {
arr := strings.Split(string(ev.Kv.Key), "_")
serviceName := arr[1]
httpAddr := arr[2]
serviceAddr := httpAddr
switch ev.Type {
case 0: //put
g.addServiceNode(serviceName, serviceAddr)
log.Infof("service", "%s node %s join", serviceName, serviceAddr)
case 1: //delete
g.delServiceNode(serviceName, serviceAddr)
log.Infof("service", "%s node %s leave", serviceName, serviceAddr)
}
}
}
}
func (g *Garden) getAllServices() ([]string, error) {
client, err := g.GetEtcd()
if err != nil {
return []string{}, err
}
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
resp, err := client.Get(ctx, g.cfg.Service.EtcdKey+"_", clientV3.WithPrefix())
cancel()
if err != nil {
log.Error("getAllServices", err)
return []string{}, nil
}
var services []string
for _, ev := range resp.Kvs {
arr := strings.Split(string(ev.Key), g.cfg.Service.EtcdKey+"_")
service := arr[1]
services = append(services, service)
}
for _, service := range services {
arr := strings.Split(service, "_")
serviceName := arr[0]
serviceHttpAddr := arr[1]
g.addServiceNode(serviceName, serviceHttpAddr)
}
return services, nil
}
func (g *Garden) getServicesByName(serviceName string) ([]string, error) {
client, err := g.GetEtcd()
if err != nil {
return nil, err
}
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
resp, err := client.Get(ctx, g.cfg.Service.EtcdKey+"_"+serviceName, clientV3.WithPrefix())
cancel()
if err != nil {
log.Error("getServicesByName", err)
return []string{}, nil
}
var services []string
for _, ev := range resp.Kvs {
arr := strings.Split(string(ev.Key), g.cfg.Service.EtcdKey+"_"+serviceName+"_")
serviceAddr := arr[1]
services = append(services, serviceAddr)
}
return services, nil
}
func (g *Garden) addServiceNode(name, addr string) {
sm := serviceOperate{
operate: "addNode",
serviceName: name,
serviceAddr: addr,
}
g.serviceManager <- sm
}
func (g *Garden) delServiceNode(name, addr string) {
sm := serviceOperate{
operate: "delNode",
serviceName: name,
serviceAddr: addr,
}
g.serviceManager <- sm
}
func (g *Garden) createServiceIndex(name string) {
if !g.existsService(name) {
g.services[name] = &service{
Nodes: []node{},
}
}
}
func (g *Garden) existsService(name string) bool {
_, ok := g.services[name]
return ok
}
func (g *Garden) getServiceHttpAddr(name string, index int) (string, error) {
if index > len(g.services[name].Nodes)-1 {
return "", errors.New("service node not found")
}
arr := strings.Split(strings.Split(g.services[name].Nodes[index].Addr, "_")[0], ":")
return arr[0] + ":" + arr[1], nil
}
func (g *Garden) getServiceRpcAddr(name string, index int) (string, error) {
if index > len(g.services[name].Nodes)-1 {
return "", errors.New("service node not found")
}
arr := strings.Split(strings.Split(g.services[name].Nodes[index].Addr, "_")[0], ":")
return arr[0] + ":" + arr[2], nil
}
func (g *Garden) serviceManageWatch(ch chan serviceOperate) {
for {
select {
case sm := <-ch:
switch sm.operate {
case "addNode":
g.createServiceIndex(sm.serviceName)
g.services[sm.serviceName].Nodes = append(g.services[sm.serviceName].Nodes, node{Addr: sm.serviceAddr})
break
case "delNode":
if g.existsService(sm.serviceName) {
for i := 0; i < len(g.services[sm.serviceName].Nodes); i++ {
if g.services[sm.serviceName].Nodes[i].Addr == sm.serviceAddr {
g.services[sm.serviceName].Nodes = append(g.services[sm.serviceName].Nodes[:i], g.services[sm.serviceName].Nodes[i+1:]...)
i--
}
}
}
break
}
}
}
}
func (g *Garden) selectService(name string) (string, int, error) {
if _, ok := g.services[name]; !ok {
return "", 0, errors.New("service not found")
}
var waitingMin int64 = 0
nodeIndex := 0
nodeLen := len(g.services[name].Nodes)
if nodeLen < 1 {
return "", 0, errors.New("service node not found")
} else if nodeLen > 1 {
// get the min waiting service node
for k, v := range g.services[name].Nodes {
if k == 0 {
waitingMin = atomic.LoadInt64(&v.Waiting)
continue
}
if t := atomic.LoadInt64(&v.Waiting); t < waitingMin {
nodeIndex = k
waitingMin = t
}
}
// if all zero, use rand
if waitingMin == 0 {
nodeIndex = rand.Intn(nodeLen)
} /* else { //test
fmt.Println("not rand")
}*/
}
return g.services[name].Nodes[nodeIndex].Addr, nodeIndex, nil
}