/
etcd.go
175 lines (150 loc) · 4.55 KB
/
etcd.go
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package serverplugin
import (
"errors"
"fmt"
"net"
"net/url"
"strconv"
"strings"
"sync"
"time"
"github.com/docker/libkv"
"github.com/docker/libkv/store"
"github.com/docker/libkv/store/etcd"
metrics "github.com/rcrowley/go-metrics"
"github.com/werunclub/rpcx/log"
)
func init() {
etcd.Register()
}
// EtcdRegisterPlugin implements etcd registry.
type EtcdRegisterPlugin struct {
// service address, for example, tcp@127.0.0.1:8972, quic@127.0.0.1:1234
ServiceAddress string
// etcd addresses
EtcdServers []string
// base path for rpcx server, for example com/example/rpcx
BasePath string
Metrics metrics.Registry
// Registered services
Services []string
metasLock sync.RWMutex
metas map[string]string
UpdateInterval time.Duration
Options *store.Config
kv store.Store
}
// Start starts to connect etcd cluster
func (p *EtcdRegisterPlugin) Start() error {
if p.kv == nil {
kv, err := libkv.NewStore(store.ETCD, p.EtcdServers, p.Options)
if err != nil {
log.Errorf("cannot create etcd registry: %v", err)
return err
}
p.kv = kv
}
err := p.kv.Put(p.BasePath, []byte("rpcx_path"), &store.WriteOptions{IsDir: true})
if err != nil && !strings.Contains(err.Error(), "Not a file") {
log.Errorf("cannot create etcd path %s: %v", p.BasePath, err)
return err
}
if p.UpdateInterval > 0 {
ticker := time.NewTicker(p.UpdateInterval)
go func() {
defer p.kv.Close()
// refresh service TTL
for range ticker.C {
var data []byte
if p.Metrics != nil {
clientMeter := metrics.GetOrRegisterMeter("clientMeter", p.Metrics)
data = []byte(strconv.FormatInt(clientMeter.Count()/60, 10))
}
//set this same metrics for all services at this server
for _, name := range p.Services {
nodePath := fmt.Sprintf("%s/%s/%s", p.BasePath, name, p.ServiceAddress)
kvPair, err := p.kv.Get(nodePath)
if err != nil {
log.Infof("can't get data of node: %s, because of %v", nodePath, err.Error())
p.metasLock.RLock()
meta := p.metas[name]
p.metasLock.RUnlock()
err = p.kv.Put(nodePath, []byte(meta), &store.WriteOptions{TTL: p.UpdateInterval * 3})
if err != nil {
log.Errorf("cannot re-create etcd path %s: %v", nodePath, err)
}
} else {
v, _ := url.ParseQuery(string(kvPair.Value))
v.Set("tps", string(data))
p.kv.Put(nodePath, []byte(v.Encode()), &store.WriteOptions{TTL: p.UpdateInterval * 3})
}
}
}
}()
}
return nil
}
// HandleConnAccept handles connections from clients
func (p *EtcdRegisterPlugin) HandleConnAccept(conn net.Conn) (net.Conn, bool) {
if p.Metrics != nil {
clientMeter := metrics.GetOrRegisterMeter("clientMeter", p.Metrics)
clientMeter.Mark(1)
}
return conn, true
}
// Register handles registering event.
// this service is registered at BASE/serviceName/thisIpAddress node
func (p *EtcdRegisterPlugin) Register(name string, rcvr interface{}, metadata string) (err error) {
if "" == strings.TrimSpace(name) {
err = errors.New("Register service `name` can't be empty")
return
}
if p.kv == nil {
etcd.Register()
kv, err := libkv.NewStore(store.ETCD, p.EtcdServers, nil)
if err != nil {
log.Errorf("cannot create etcd registry: %v", err)
return err
}
p.kv = kv
}
err = p.kv.Put(p.BasePath, []byte("rpcx_path"), &store.WriteOptions{IsDir: true})
if err != nil && !strings.Contains(err.Error(), "Not a file") {
log.Errorf("cannot create etcd path %s: %v", p.BasePath, err)
return err
}
nodePath := fmt.Sprintf("%s/%s", p.BasePath, name)
err = p.kv.Put(nodePath, []byte(name), &store.WriteOptions{IsDir: true})
if err != nil && !strings.Contains(err.Error(), "Not a file") {
log.Errorf("cannot create etcd path %s: %v", nodePath, err)
return err
}
nodePath = fmt.Sprintf("%s/%s/%s", p.BasePath, name, p.ServiceAddress)
err = p.kv.Put(nodePath, []byte(metadata), &store.WriteOptions{TTL: p.UpdateInterval * 2})
if err != nil {
log.Errorf("cannot create etcd path %s: %v", nodePath, err)
return err
}
p.Services = append(p.Services, name)
p.metasLock.Lock()
if p.metas == nil {
p.metas = make(map[string]string)
}
p.metas[name] = metadata
p.metasLock.Unlock()
return
}
// Deregister 注销服务
func (p *EtcdRegisterPlugin) Deregister(name string) (err error) {
if "" == strings.TrimSpace(name) {
err = errors.New("Register service `name` can't be empty")
return
}
nodePath := fmt.Sprintf("%s/%s/%s", p.BasePath, name, p.ServiceAddress)
err = p.kv.Delete(nodePath)
if err != nil {
log.Errorf("cannot delete etcd path %s: %v", nodePath, err)
return err
}
return
}