mirror of
https://gitee.com/rainbond/Rainbond.git
synced 2024-11-29 18:27:58 +08:00
307 lines
7.5 KiB
Go
307 lines
7.5 KiB
Go
// Copyright (C) 2014-2018 Goodrain Co., Ltd.
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// RAINBOND, Application Management Platform
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version. For any non-GPL usage of Rainbond,
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// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
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// must be obtained first.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package discover
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import (
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"fmt"
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"strings"
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"sync"
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"time"
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"github.com/goodrain/rainbond/discover/config"
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"golang.org/x/net/context"
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"github.com/coreos/etcd/clientv3"
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"github.com/coreos/etcd/mvcc/mvccpb"
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etcdutil "github.com/goodrain/rainbond/util/etcd"
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"github.com/sirupsen/logrus"
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)
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//CallbackUpdate 每次返还变化
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type CallbackUpdate interface {
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//TODO:
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//weight自动发现更改实现暂时不 Ready
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UpdateEndpoints(operation config.Operation, endpoints ...*config.Endpoint)
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//when watch occurred error,will exec this method
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Error(error)
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}
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//Callback 每次返回全部节点
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type Callback interface {
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UpdateEndpoints(endpoints ...*config.Endpoint)
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//when watch occurred error,will exec this method
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Error(error)
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}
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//Discover 后端服务自动发现
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type Discover interface {
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// Add project to cache if not exists, then watch the endpoints.
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AddProject(name string, callback Callback)
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// Update a project.
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AddUpdateProject(name string, callback CallbackUpdate)
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Stop()
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}
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//GetDiscover 获取服务发现管理器
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func GetDiscover(opt config.DiscoverConfig) (Discover, error) {
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if opt.Ctx == nil {
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opt.Ctx = context.Background()
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}
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ctx, cancel := context.WithCancel(opt.Ctx)
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client, err := etcdutil.NewClient(ctx, opt.EtcdClientArgs)
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if err != nil {
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cancel()
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return nil, err
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}
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etcdD := &etcdDiscover{
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projects: make(map[string]CallbackUpdate),
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ctx: ctx,
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cancel: cancel,
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client: client,
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prefix: "/rainbond/discover",
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}
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return etcdD, nil
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}
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type etcdDiscover struct {
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projects map[string]CallbackUpdate
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lock sync.Mutex
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ctx context.Context
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cancel context.CancelFunc
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client *clientv3.Client
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prefix string
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}
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type defaultCallBackUpdate struct {
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endpoints map[string]*config.Endpoint
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callback Callback
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lock sync.Mutex
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}
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func (d *defaultCallBackUpdate) UpdateEndpoints(operation config.Operation, endpoints ...*config.Endpoint) {
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d.lock.Lock()
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defer d.lock.Unlock()
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switch operation {
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case config.ADD:
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for _, e := range endpoints {
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if old, ok := d.endpoints[e.Name]; !ok {
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d.endpoints[e.Name] = e
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} else {
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if e.Mode == 0 {
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old.URL = e.URL
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}
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if e.Mode == 1 {
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old.Weight = e.Weight
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}
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if e.Mode == 2 {
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old.URL = e.URL
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old.Weight = e.Weight
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}
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}
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}
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case config.SYNC:
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for _, e := range endpoints {
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if old, ok := d.endpoints[e.Name]; !ok {
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d.endpoints[e.Name] = e
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} else {
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if e.Mode == 0 {
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old.URL = e.URL
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}
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if e.Mode == 1 {
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old.Weight = e.Weight
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}
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if e.Mode == 2 {
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old.URL = e.URL
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old.Weight = e.Weight
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}
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}
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}
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case config.DELETE:
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for _, e := range endpoints {
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if e.Mode == 0 {
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if old, ok := d.endpoints[e.Name]; ok {
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old.URL = ""
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}
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}
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if e.Mode == 1 {
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if old, ok := d.endpoints[e.Name]; ok {
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old.Weight = 0
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}
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}
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if e.Mode == 2 {
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if _, ok := d.endpoints[e.Name]; ok {
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delete(d.endpoints, e.Name)
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}
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}
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}
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case config.UPDATE:
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for _, e := range endpoints {
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if e.Mode == 0 {
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if old, ok := d.endpoints[e.Name]; ok {
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old.URL = e.URL
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}
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}
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if e.Mode == 1 {
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if old, ok := d.endpoints[e.Name]; ok {
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old.Weight = e.Weight
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}
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}
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if e.Mode == 2 {
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if old, ok := d.endpoints[e.Name]; ok {
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old.URL = e.URL
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old.Weight = e.Weight
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}
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}
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}
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}
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var re []*config.Endpoint
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for _, v := range d.endpoints {
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if v.URL != "" {
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re = append(re, v)
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}
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}
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d.callback.UpdateEndpoints(re...)
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}
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func (d *defaultCallBackUpdate) Error(err error) {
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d.callback.Error(err)
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}
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func (e *etcdDiscover) AddProject(name string, callback Callback) {
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e.lock.Lock()
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defer e.lock.Unlock()
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if _, ok := e.projects[name]; !ok {
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cal := &defaultCallBackUpdate{
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callback: callback,
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endpoints: make(map[string]*config.Endpoint),
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}
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e.projects[name] = cal
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go e.discover(name, cal)
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}
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}
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func (e *etcdDiscover) AddUpdateProject(name string, callback CallbackUpdate) {
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e.lock.Lock()
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defer e.lock.Unlock()
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if _, ok := e.projects[name]; !ok {
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e.projects[name] = callback
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go e.discover(name, callback)
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}
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}
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func (e *etcdDiscover) Stop() {
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e.cancel()
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}
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func (e *etcdDiscover) removeProject(name string) {
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e.lock.Lock()
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defer e.lock.Unlock()
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if _, ok := e.projects[name]; ok {
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delete(e.projects, name)
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}
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}
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func (e *etcdDiscover) discover(name string, callback CallbackUpdate) {
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ctx, cancel := context.WithCancel(e.ctx)
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defer cancel()
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endpoints := e.list(name)
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if endpoints != nil && len(endpoints) > 0 {
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callback.UpdateEndpoints(config.SYNC, endpoints...)
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}
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watch := e.client.Watch(ctx, fmt.Sprintf("%s/%s", e.prefix, name), clientv3.WithPrefix())
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timer := time.NewTimer(time.Second * 20)
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defer timer.Stop()
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for {
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select {
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case <-e.ctx.Done():
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return
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case <-timer.C:
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go e.discover(name, callback)
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return
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case res := <-watch:
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if err := res.Err(); err != nil {
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callback.Error(err)
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logrus.Debugf("monitor discover get watch error: %s, remove this watch target first, and then sleep 10 sec, we will re-watch it", err.Error())
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e.removeProject(name)
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time.Sleep(10 * time.Second)
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e.AddUpdateProject(name, callback)
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return
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}
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for _, event := range res.Events {
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if event.Kv != nil {
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var end *config.Endpoint
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kstep := strings.Split(string(event.Kv.Key), "/")
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if len(kstep) > 2 {
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serverName := kstep[len(kstep)-1]
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serverURL := string(event.Kv.Value)
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end = &config.Endpoint{Name: serverName, URL: serverURL, Mode: 0}
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}
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if end != nil { //获取服务地址
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switch event.Type {
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case mvccpb.DELETE:
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callback.UpdateEndpoints(config.DELETE, end)
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case mvccpb.PUT:
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if event.Kv.Version == 1 {
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callback.UpdateEndpoints(config.ADD, end)
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} else {
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callback.UpdateEndpoints(config.UPDATE, end)
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}
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}
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}
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}
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}
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timer.Reset(time.Second * 20)
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}
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}
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}
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func (e *etcdDiscover) list(name string) []*config.Endpoint {
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ctx, cancel := context.WithTimeout(e.ctx, time.Second*10)
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defer cancel()
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res, err := e.client.Get(ctx, fmt.Sprintf("%s/%s", e.prefix, name), clientv3.WithPrefix())
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if err != nil {
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logrus.Errorf("list all servers of %s error.%s", name, err.Error())
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return nil
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}
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if res.Count == 0 {
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return nil
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}
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return makeEndpointForKvs(res.Kvs)
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}
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func makeEndpointForKvs(kvs []*mvccpb.KeyValue) (res []*config.Endpoint) {
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var ends = make(map[string]*config.Endpoint)
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for _, kv := range kvs {
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//获取服务地址
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kstep := strings.Split(string(kv.Key), "/")
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if len(kstep) > 2 {
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serverName := kstep[len(kstep)-1]
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serverURL := string(kv.Value)
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if en, ok := ends[serverName]; ok {
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en.URL = serverURL
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} else {
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ends[serverName] = &config.Endpoint{Name: serverName, URL: serverURL}
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}
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}
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}
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for _, v := range ends {
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res = append(res, v)
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}
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return
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}
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