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etcd_resolver.go
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/
etcd_resolver.go
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// etcd
// @author LanguageY++2013 2023/5/8 18:31
// @company soulgame
package etcd
import (
"strings"
"google.golang.org/grpc/resolver"
"github.com/coreos/etcd/clientv3"
"sync"
etcd_wrapper "github.com/Languege/flexmatch/common/wrappers/etcd"
"github.com/Languege/flexmatch/common/logger"
"net/url"
"fmt"
"context"
"github.com/coreos/etcd/mvcc/mvccpb"
"encoding/json"
"google.golang.org/grpc/attributes"
)
const (
EtcdScheme = "etcd2"
)
func init() {
resolver.Register(newEtcdBuilder())
}
type etcdBuilder struct {
client *clientv3.Client
once *sync.Once
}
func newEtcdBuilder() *etcdBuilder {
return &etcdBuilder{
once: &sync.Once{},
}
}
func(d *etcdBuilder) checkInit(addrs []string, username, password string) {
d.once.Do(func() {
options := []etcd_wrapper.Option{}
if username != "" && password != "" {
options = append(options, etcd_wrapper.WithAuth(username, password))
}
var err error
d.client, err = etcd_wrapper.NewClient(addrs, options...)
if err != nil {
logger.Errorf("new etcd client err %v", err)
}
})
}
// Build
func (d *etcdBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (
resolver.Resolver, error) {
tURL, err := url.Parse(fmt.Sprintf("%s://%s/%s", target.Scheme, target.Authority, target.Endpoint))
if err != nil {
logger.Errorf("url parse target err %s", err)
return nil, err
}
password, _ := tURL.User.Password()
//构建器初始化
d.checkInit(strings.Split(tURL.Host, ","), tURL.User.Username(), password)
//对 target.Endpoint 进行监听
r := d.newResolver(cc, target.Endpoint)
r.start()
return r, nil
}
func(d *etcdBuilder) newResolver(cc resolver.ClientConn, endpoint string) *etcdResolver {
r := &etcdResolver{
cc: cc,
endpoint: endpoint,
client: d.client,
services: map[string]*ServiceDescriptor{},
}
r.key = fmt.Sprintf("%s/%s", GrpcServicePrefix, r.endpoint)
return r
}
func (d *etcdBuilder) Scheme() string {
return EtcdScheme
}
type etcdResolver struct {
cc resolver.ClientConn
endpoint string
key string
client *clientv3.Client
//服务集合
services map[string]*ServiceDescriptor
serviceGuard sync.Mutex
}
func (r *etcdResolver) Close() {
}
func (r *etcdResolver) ResolveNow(options resolver.ResolveNowOptions) {
}
func(r *etcdResolver) listener() {
var addrs []resolver.Address
for _, sd := range r.services {
kvs := make([]interface{}, 0, len(sd.Tags))
for _, v := range sd.Tags {
kvs = append(kvs, v)
}
addrs = append(addrs, resolver.Address{
Addr: sd.ListenAddr,
ServerName: sd.Name,
Attributes: attributes.New(kvs...),
})
}
r.cc.UpdateState(resolver.State{
Addresses: addrs,
})
logger.Infof("UpdateState:%#v", addrs)
}
func (r *etcdResolver) start() {
resp, err := r.client.Get(context.Background(), r.key, clientv3.WithPrefix())
if err != nil {
logger.Errorf("get %s err %v", r.key, err)
return
}
for _, kv := range resp.Kvs {
r.addService(kv)
}
watchChan := r.client.Watch(context.Background(), r.key, clientv3.WithPrefix(), clientv3.WithPrevKV())
go func() {
for resp := range watchChan {
for _, ev := range resp.Events {
switch ev.Type {
case clientv3.EventTypePut:
r.addService(ev.Kv)
case clientv3.EventTypeDelete:
r.removeService(ev.PrevKv)
}
}
}
}()
}
func(r *etcdResolver) addService(kv *mvccpb.KeyValue) {
sd := &ServiceDescriptor{}
err := json.Unmarshal(kv.Value, sd)
if err != nil {
logger.Errorf("add service unmarshal err %v, key %s value %s", err, string(kv.Key), string(kv.Value))
return
}
r.serviceGuard.Lock()
r.services[sd.ListenAddr] = sd
r.serviceGuard.Unlock()
r.notifyChange()
}
func(r *etcdResolver) removeService(kv *mvccpb.KeyValue) {
sd := &ServiceDescriptor{}
err := json.Unmarshal(kv.Value, sd)
if err != nil {
logger.Errorf("remove service unmarshal err %v, key %s value %s", err, string(kv.Key), string(kv.Value))
return
}
r.serviceGuard.Lock()
delete(r.services, sd.ListenAddr)
r.serviceGuard.Unlock()
}
func(r *etcdResolver) notifyChange() {
r.listener()
}
// 返回一个代表所给endpoints的字符串,keyPrefix代码服务前缀
func BuildTarget(endpoints []string, service string) string {
return fmt.Sprintf("%s://%s/%s", EtcdScheme,
strings.Join(endpoints, ","), service)
}
// 返回一个代表所给endpoints的字符串,keyPrefix代码服务前缀
func BuildTargetWithUserPassword(endpoints []string, service string, username, password string) string {
return fmt.Sprintf("%s://%s:%s@%s/%s", EtcdScheme,
strings.Join(endpoints, ","), username, password, service)
}