forked from zeromicro/go-zero
/
registry.go
366 lines (321 loc) · 7.72 KB
/
registry.go
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package internal
import (
"context"
"fmt"
"io"
"sort"
"strings"
"sync"
"time"
"github.com/zeromicro/go-zero/core/contextx"
"github.com/zeromicro/go-zero/core/lang"
"github.com/zeromicro/go-zero/core/logx"
"github.com/zeromicro/go-zero/core/syncx"
"github.com/zeromicro/go-zero/core/threading"
clientv3 "go.etcd.io/etcd/client/v3"
)
var (
registry = Registry{
clusters: make(map[string]*cluster),
}
connManager = syncx.NewResourceManager()
)
// A Registry is a registry that manages the etcd client connections.
type Registry struct {
clusters map[string]*cluster
lock sync.Mutex
}
// GetRegistry returns a global Registry.
func GetRegistry() *Registry {
return ®istry
}
// GetConn returns an etcd client connection associated with given endpoints.
func (r *Registry) GetConn(endpoints []string) (EtcdClient, error) {
c, _ := r.getCluster(endpoints)
return c.getClient()
}
// Monitor monitors the key on given etcd endpoints, notify with the given UpdateListener.
func (r *Registry) Monitor(endpoints []string, key string, l UpdateListener) error {
c, exists := r.getCluster(endpoints)
// if exists, the existing values should be updated to the listener.
if exists {
kvs := c.getCurrent(key)
for _, kv := range kvs {
l.OnAdd(kv)
}
}
return c.monitor(key, l)
}
func (r *Registry) getCluster(endpoints []string) (c *cluster, exists bool) {
clusterKey := getClusterKey(endpoints)
r.lock.Lock()
defer r.lock.Unlock()
c, exists = r.clusters[clusterKey]
if !exists {
c = newCluster(endpoints)
r.clusters[clusterKey] = c
}
return
}
type cluster struct {
endpoints []string
key string
values map[string]map[string]string
listeners map[string][]UpdateListener
watchGroup *threading.RoutineGroup
done chan lang.PlaceholderType
lock sync.Mutex
}
func newCluster(endpoints []string) *cluster {
return &cluster{
endpoints: endpoints,
key: getClusterKey(endpoints),
values: make(map[string]map[string]string),
listeners: make(map[string][]UpdateListener),
watchGroup: threading.NewRoutineGroup(),
done: make(chan lang.PlaceholderType),
}
}
func (c *cluster) context(cli EtcdClient) context.Context {
return contextx.ValueOnlyFrom(cli.Ctx())
}
func (c *cluster) getClient() (EtcdClient, error) {
val, err := connManager.GetResource(c.key, func() (io.Closer, error) {
return c.newClient()
})
if err != nil {
return nil, err
}
return val.(EtcdClient), nil
}
func (c *cluster) getCurrent(key string) []KV {
c.lock.Lock()
defer c.lock.Unlock()
var kvs []KV
for k, v := range c.values[key] {
kvs = append(kvs, KV{
Key: k,
Val: v,
})
}
return kvs
}
func (c *cluster) handleChanges(key string, kvs []KV) {
var add []KV
var remove []KV
c.lock.Lock()
listeners := append([]UpdateListener(nil), c.listeners[key]...)
vals, ok := c.values[key]
if !ok {
add = kvs
vals = make(map[string]string)
for _, kv := range kvs {
vals[kv.Key] = kv.Val
}
c.values[key] = vals
} else {
m := make(map[string]string)
for _, kv := range kvs {
m[kv.Key] = kv.Val
}
for k, v := range vals {
if val, ok := m[k]; !ok || v != val {
remove = append(remove, KV{
Key: k,
Val: v,
})
}
}
for k, v := range m {
if val, ok := vals[k]; !ok || v != val {
add = append(add, KV{
Key: k,
Val: v,
})
}
}
c.values[key] = m
}
c.lock.Unlock()
for _, kv := range add {
for _, l := range listeners {
l.OnAdd(kv)
}
}
for _, kv := range remove {
for _, l := range listeners {
l.OnDelete(kv)
}
}
}
func (c *cluster) handleWatchEvents(key string, events []*clientv3.Event) {
c.lock.Lock()
listeners := append([]UpdateListener(nil), c.listeners[key]...)
c.lock.Unlock()
for _, ev := range events {
switch ev.Type {
case clientv3.EventTypePut:
c.lock.Lock()
if vals, ok := c.values[key]; ok {
vals[string(ev.Kv.Key)] = string(ev.Kv.Value)
} else {
c.values[key] = map[string]string{string(ev.Kv.Key): string(ev.Kv.Value)}
}
c.lock.Unlock()
for _, l := range listeners {
l.OnAdd(KV{
Key: string(ev.Kv.Key),
Val: string(ev.Kv.Value),
})
}
case clientv3.EventTypeDelete:
c.lock.Lock()
if vals, ok := c.values[key]; ok {
delete(vals, string(ev.Kv.Key))
}
c.lock.Unlock()
for _, l := range listeners {
l.OnDelete(KV{
Key: string(ev.Kv.Key),
Val: string(ev.Kv.Value),
})
}
default:
logx.Errorf("Unknown event type: %v", ev.Type)
}
}
}
func (c *cluster) load(cli EtcdClient, key string) int64 {
var resp *clientv3.GetResponse
for {
var err error
ctx, cancel := context.WithTimeout(c.context(cli), RequestTimeout)
resp, err = cli.Get(ctx, makeKeyPrefix(key), clientv3.WithPrefix())
cancel()
if err == nil {
break
}
logx.Error(err)
time.Sleep(coolDownInterval)
}
var kvs []KV
for _, ev := range resp.Kvs {
kvs = append(kvs, KV{
Key: string(ev.Key),
Val: string(ev.Value),
})
}
c.handleChanges(key, kvs)
return resp.Header.Revision
}
func (c *cluster) monitor(key string, l UpdateListener) error {
c.lock.Lock()
c.listeners[key] = append(c.listeners[key], l)
c.lock.Unlock()
cli, err := c.getClient()
if err != nil {
return err
}
rev := c.load(cli, key)
c.watchGroup.Run(func() {
c.watch(cli, key, rev)
})
return nil
}
func (c *cluster) newClient() (EtcdClient, error) {
cli, err := NewClient(c.endpoints)
if err != nil {
return nil, err
}
go c.watchConnState(cli)
return cli, nil
}
func (c *cluster) reload(cli EtcdClient) {
c.lock.Lock()
close(c.done)
c.watchGroup.Wait()
c.done = make(chan lang.PlaceholderType)
c.watchGroup = threading.NewRoutineGroup()
var keys []string
for k := range c.listeners {
keys = append(keys, k)
}
c.lock.Unlock()
for _, key := range keys {
k := key
c.watchGroup.Run(func() {
rev := c.load(cli, k)
c.watch(cli, k, rev)
})
}
}
func (c *cluster) watch(cli EtcdClient, key string, rev int64) {
for {
if c.watchStream(cli, key, rev) {
return
}
}
}
func (c *cluster) watchStream(cli EtcdClient, key string, rev int64) bool {
var rch clientv3.WatchChan
if rev != 0 {
rch = cli.Watch(clientv3.WithRequireLeader(c.context(cli)), makeKeyPrefix(key), clientv3.WithPrefix(),
clientv3.WithRev(rev+1))
} else {
rch = cli.Watch(clientv3.WithRequireLeader(c.context(cli)), makeKeyPrefix(key), clientv3.WithPrefix())
}
for {
select {
case wresp, ok := <-rch:
if !ok {
logx.Error("etcd monitor chan has been closed")
return false
}
if wresp.Canceled {
logx.Errorf("etcd monitor chan has been canceled, error: %v", wresp.Err())
return false
}
if wresp.Err() != nil {
logx.Error(fmt.Sprintf("etcd monitor chan error: %v", wresp.Err()))
return false
}
c.handleWatchEvents(key, wresp.Events)
case <-c.done:
return true
}
}
}
func (c *cluster) watchConnState(cli EtcdClient) {
watcher := newStateWatcher()
watcher.addListener(func() {
go c.reload(cli)
})
watcher.watch(cli.ActiveConnection())
}
// DialClient dials an etcd cluster with given endpoints.
func DialClient(endpoints []string) (EtcdClient, error) {
cfg := clientv3.Config{
Endpoints: endpoints,
AutoSyncInterval: autoSyncInterval,
DialTimeout: DialTimeout,
DialKeepAliveTime: dialKeepAliveTime,
DialKeepAliveTimeout: DialTimeout,
RejectOldCluster: true,
PermitWithoutStream: true,
}
if account, ok := GetAccount(endpoints); ok {
cfg.Username = account.User
cfg.Password = account.Pass
}
if tlsCfg, ok := GetTLS(endpoints); ok {
cfg.TLS = tlsCfg
}
return clientv3.New(cfg)
}
func getClusterKey(endpoints []string) string {
sort.Strings(endpoints)
return strings.Join(endpoints, endpointsSeparator)
}
func makeKeyPrefix(key string) string {
return fmt.Sprintf("%s%c", key, Delimiter)
}