/
registry.go
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/
registry.go
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// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package etcdv3
import (
"context"
"encoding/json"
"fmt"
"net"
"net/url"
"strings"
"sync"
"time"
"github.com/coreos/etcd/clientv3/concurrency"
"github.com/douyu/jupiter/pkg"
"github.com/douyu/jupiter/pkg/constant"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/douyu/jupiter/pkg/client/etcdv3"
"github.com/douyu/jupiter/pkg/ecode"
"github.com/douyu/jupiter/pkg/registry"
"github.com/douyu/jupiter/pkg/server"
"github.com/douyu/jupiter/pkg/util/xgo"
"github.com/douyu/jupiter/pkg/xlog"
)
type etcdv3Registry struct {
client *etcdv3.Client
kvs sync.Map
*Config
cancel context.CancelFunc
rmu *sync.RWMutex
sessions map[string]*concurrency.Session
}
func newETCDRegistry(config *Config) *etcdv3Registry {
if config.logger == nil {
config.logger = xlog.JupiterLogger
}
config.logger = config.logger.With(xlog.FieldMod(ecode.ModRegistryETCD), xlog.FieldAddrAny(config.Config.Endpoints))
reg := &etcdv3Registry{
client: config.Config.Build(),
Config: config,
kvs: sync.Map{},
rmu: &sync.RWMutex{},
sessions: make(map[string]*concurrency.Session),
}
return reg
}
// RegisterService register service to registry
func (reg *etcdv3Registry) RegisterService(ctx context.Context, info *server.ServiceInfo) error {
err := reg.registerBiz(ctx, info)
if err != nil {
return err
}
return reg.registerMetric(ctx, info)
}
// UnregisterService unregister service from registry
func (reg *etcdv3Registry) UnregisterService(ctx context.Context, info *server.ServiceInfo) error {
return reg.unregister(ctx, reg.registerKey(info))
}
// ListServices list service registered in registry with name `name`
func (reg *etcdv3Registry) ListServices(ctx context.Context, name string, scheme string) (services []*server.ServiceInfo, err error) {
target := fmt.Sprintf("/%s/%s/providers/%s://", reg.Prefix, name, scheme)
getResp, getErr := reg.client.Get(ctx, target, clientv3.WithPrefix())
if getErr != nil {
reg.logger.Error(ecode.MsgWatchRequestErr, xlog.FieldErrKind(ecode.ErrKindRequestErr), xlog.FieldErr(getErr), xlog.FieldAddr(target))
return nil, getErr
}
for _, kv := range getResp.Kvs {
var service server.ServiceInfo
if err := json.Unmarshal(kv.Value, &service); err != nil {
reg.logger.Warnf("invalid service", xlog.FieldErr(err))
continue
}
services = append(services, &service)
}
return
}
// WatchServices watch service change event, then return address list
func (reg *etcdv3Registry) WatchServices(ctx context.Context, name string, scheme string) (chan registry.Endpoints, error) {
prefix := fmt.Sprintf("/%s/%s/", reg.Prefix, name)
watch, err := reg.client.WatchPrefix(context.Background(), prefix)
if err != nil {
return nil, err
}
var addresses = make(chan registry.Endpoints, 10)
var al = ®istry.Endpoints{
Nodes: make(map[string]server.ServiceInfo),
RouteConfigs: make(map[string]registry.RouteConfig),
ConsumerConfigs: make(map[string]registry.ConsumerConfig),
ProviderConfigs: make(map[string]registry.ProviderConfig),
}
for _, kv := range watch.IncipientKeyValues() {
updateAddrList(al, prefix, scheme, kv)
}
// var snapshot registry.Endpoints
// xstruct.CopyStruct(al, &snapshot)
addresses <- *al.DeepCopy()
xgo.Go(func() {
for event := range watch.C() {
switch event.Type {
case mvccpb.PUT:
updateAddrList(al, prefix, scheme, event.Kv)
case mvccpb.DELETE:
deleteAddrList(al, prefix, scheme, event.Kv)
}
// var snapshot registry.Endpoints
// xstruct.CopyStruct(al, &snapshot)
out := al.DeepCopy()
fmt.Printf("al => %p\n", al.Nodes)
fmt.Printf("snapshot => %p\n", out.Nodes)
select {
// case addresses <- snapshot:
case addresses <- *out:
default:
xlog.Warnf("invalid")
}
}
})
return addresses, nil
}
func (reg *etcdv3Registry) unregister(ctx context.Context, key string) error {
if _, ok := ctx.Deadline(); !ok {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, reg.ReadTimeout)
defer cancel()
}
if err := reg.delSession(key); err != nil {
return err
}
_, err := reg.client.Delete(ctx, key)
if err == nil {
reg.kvs.Delete(key)
}
return err
}
// Close ...
func (reg *etcdv3Registry) Close() error {
if reg.cancel != nil {
reg.cancel()
}
var wg sync.WaitGroup
reg.kvs.Range(func(k, v interface{}) bool {
wg.Add(1)
go func(k interface{}) {
defer wg.Done()
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
err := reg.unregister(ctx, k.(string))
if err != nil {
reg.logger.Error("unregister service", xlog.FieldErrKind(ecode.ErrKindRequestErr), xlog.FieldErr(err), xlog.FieldErr(err), xlog.FieldKeyAny(k), xlog.FieldValueAny(v))
} else {
reg.logger.Info("unregister service", xlog.FieldKeyAny(k), xlog.FieldValueAny(v))
}
cancel()
}(k)
return true
})
wg.Wait()
return nil
}
func (reg *etcdv3Registry) registerMetric(ctx context.Context, info *server.ServiceInfo) error {
if info.Kind != constant.ServiceGovernor {
return nil
}
metric := "/prometheus/job/%s/%s/%s"
if _, ok := ctx.Deadline(); !ok {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, reg.ReadTimeout)
defer cancel()
}
val := info.Address
key := fmt.Sprintf(metric, info.Name, pkg.HostName(), val)
opOptions := make([]clientv3.OpOption, 0)
// opOptions = append(opOptions, clientv3.WithSerializable())
if ttl := reg.Config.ServiceTTL.Seconds(); ttl > 0 {
//todo ctx without timeout for same as service life?
sess, err := reg.getSession(key, concurrency.WithTTL(int(ttl)))
if err != nil {
return err
}
opOptions = append(opOptions, clientv3.WithLease(sess.Lease()))
}
_, err := reg.client.Put(ctx, key, val, opOptions...)
if err != nil {
reg.logger.Error("register service", xlog.FieldErrKind(ecode.ErrKindRegisterErr), xlog.FieldErr(err), xlog.FieldKeyAny(key), xlog.FieldValueAny(info))
return err
}
reg.logger.Info("register service", xlog.FieldKeyAny(key), xlog.FieldValueAny(val))
reg.kvs.Store(key, val)
return nil
}
func (reg *etcdv3Registry) registerBiz(ctx context.Context, info *server.ServiceInfo) error {
var readCtx context.Context
var readCancel context.CancelFunc
if _, ok := ctx.Deadline(); !ok {
readCtx, readCancel = context.WithTimeout(ctx, reg.ReadTimeout)
defer readCancel()
}
key := reg.registerKey(info)
val := reg.registerValue(info)
opOptions := make([]clientv3.OpOption, 0)
// opOptions = append(opOptions, clientv3.WithSerializable())
if ttl := reg.Config.ServiceTTL.Seconds(); ttl > 0 {
//todo ctx without timeout for same as service life?
sess, err := reg.getSession(key, concurrency.WithTTL(int(ttl)))
if err != nil {
return err
}
opOptions = append(opOptions, clientv3.WithLease(sess.Lease()))
}
_, err := reg.client.Put(readCtx, key, val, opOptions...)
if err != nil {
reg.logger.Error("register service", xlog.FieldErrKind(ecode.ErrKindRegisterErr), xlog.FieldErr(err), xlog.FieldKeyAny(key), xlog.FieldValueAny(info))
return err
}
reg.logger.Info("register service", xlog.FieldKeyAny(key), xlog.FieldValueAny(val))
reg.kvs.Store(key, val)
return nil
}
func (reg *etcdv3Registry) getSession(k string, opts ...concurrency.SessionOption) (*concurrency.Session, error) {
reg.rmu.RLock()
sess, ok := reg.sessions[k]
reg.rmu.RUnlock()
if ok {
return sess, nil
}
sess, err := concurrency.NewSession(reg.client.Client)
if err != nil {
return sess, err
}
reg.rmu.Lock()
reg.sessions[k] = sess
reg.rmu.Unlock()
return sess, nil
}
func (reg *etcdv3Registry) delSession(k string) error {
if ttl := reg.Config.ServiceTTL.Seconds(); ttl > 0 {
reg.rmu.RLock()
sess, ok := reg.sessions[k]
reg.rmu.RUnlock()
if ok {
reg.rmu.Lock()
delete(reg.sessions, k)
reg.rmu.Unlock()
if err := sess.Close(); err != nil {
return err
}
}
}
return nil
}
func (reg *etcdv3Registry) registerKey(info *server.ServiceInfo) string {
return registry.GetServiceKey(reg.Prefix, info)
}
func (reg *etcdv3Registry) registerValue(info *server.ServiceInfo) string {
return registry.GetServiceValue(info)
}
func deleteAddrList(al *registry.Endpoints, prefix, scheme string, kvs ...*mvccpb.KeyValue) {
for _, kv := range kvs {
var addr = strings.TrimPrefix(string(kv.Key), prefix)
if strings.HasPrefix(addr, "providers/"+scheme) {
// 解析服务注册键
addr = strings.TrimPrefix(addr, "providers/")
if addr == "" {
continue
}
uri, err := url.Parse(addr)
if err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
delete(al.Nodes, uri.String())
}
if strings.HasPrefix(addr, "configurators/"+scheme) {
// 解析服务配置键
addr = strings.TrimPrefix(addr, "configurators/")
if addr == "" {
continue
}
uri, err := url.Parse(addr)
if err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
delete(al.RouteConfigs, uri.String())
}
if isIPPort(addr) {
// 直接删除addr 因为Delete操作的value值为空
delete(al.Nodes, addr)
delete(al.RouteConfigs, addr)
}
}
}
func updateAddrList(al *registry.Endpoints, prefix, scheme string, kvs ...*mvccpb.KeyValue) {
for _, kv := range kvs {
var addr = strings.TrimPrefix(string(kv.Key), prefix)
switch {
// 解析服务注册键
case strings.HasPrefix(addr, "providers/"+scheme):
addr = strings.TrimPrefix(addr, "providers/")
uri, err := url.Parse(addr)
if err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
var serviceInfo server.ServiceInfo
if err := json.Unmarshal(kv.Value, &serviceInfo); err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
if serviceInfo.Enable == true {
al.Nodes[uri.String()] = serviceInfo
} else {
delete(al.Nodes, uri.String())
}
case strings.HasPrefix(addr, "configurators/"+scheme):
addr = strings.TrimPrefix(addr, "configurators/")
uri, err := url.Parse(addr)
if err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
if strings.HasPrefix(uri.Path, "/routes/") { // 路由配置
var routeConfig registry.RouteConfig
if err := json.Unmarshal(kv.Value, &routeConfig); err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
routeConfig.ID = strings.TrimPrefix(uri.Path, "/routes/")
routeConfig.Scheme = uri.Scheme
routeConfig.Host = uri.Host
al.RouteConfigs[uri.String()] = routeConfig
}
if strings.HasPrefix(uri.Path, "/providers/") {
var providerConfig registry.ProviderConfig
if err := json.Unmarshal(kv.Value, &providerConfig); err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
providerConfig.ID = strings.TrimPrefix(uri.Path, "/providers/")
providerConfig.Scheme = uri.Scheme
providerConfig.Host = uri.Host
al.ProviderConfigs[uri.String()] = providerConfig
}
if strings.HasPrefix(uri.Path, "/consumers/") {
var consumerConfig registry.ConsumerConfig
if err := json.Unmarshal(kv.Value, &consumerConfig); err != nil {
xlog.Error("parse uri", xlog.FieldErrKind(ecode.ErrKindUriErr), xlog.FieldErr(err), xlog.FieldKey(string(kv.Key)))
continue
}
consumerConfig.ID = strings.TrimPrefix(uri.Path, "/consumers/")
consumerConfig.Scheme = uri.Scheme
consumerConfig.Host = uri.Host
al.ConsumerConfigs[uri.String()] = consumerConfig
}
}
}
}
func isIPPort(addr string) bool {
_, _, err := net.SplitHostPort(addr)
return err == nil
}
/*
key: /jupiter/main/configurator/grpc:///routes/1
val:
{
"upstream": { // 客户端配置
"nodes": { // 按照node负载均衡
"127.0.0.1:1980": 1,
"127.0.0.1:1981": 4
},
"group": { // 按照group负载均衡
"red": 2,
"green": 1
}
},
"uri": "/hello",
"deployment": "open_api"
}
key: /jupiter/main/configurator/grpc://127.0.0.1/routes/2
val:
{
"upstream": { // 客户端配置
"nodes": { // 按照node负载均衡
"127.0.0.1:1980": 1,
"127.0.0.1:1981": 1
},
"group": { // 按照group负载均衡
"red": 1,
"green": 2
}
},
"uri": "/hello",
"deployment": "core_api" // 部署组
}
key: /jupiter/main/configurator/grpc:///consumers/client-demo
val:
{
}
*/