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229 lines (199 loc) · 4.9 KB
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package etcd
import (
"context"
"net/http"
"sync"
"sync/atomic"
"time"
"github.com/eolinker/eosc/log"
"go.etcd.io/etcd/api/v3/mvccpb"
"go.etcd.io/etcd/api/v3/version"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/server/v3/etcdserver"
)
var _ Etcd = (*_Server)(nil)
type _Server struct {
config Config
ctx context.Context
cancel context.CancelFunc
mu sync.RWMutex
server *etcdserver.EtcdServer
raftHandler atomic.Pointer[http.Handler]
leaseHandler atomic.Pointer[http.Handler]
downgradeEnabledHandler atomic.Pointer[http.Handler]
hashKVHandler atomic.Pointer[http.Handler]
client *clientv3.Client
requestTimeout time.Duration
name string
leaderChangeHandler []ILeaderStateHandler
clientCh []chan *clientv3.Client
clusterData *Clusters
}
func (s *_Server) Status() ClusterInfo {
s.mu.RLock()
defer s.mu.RUnlock()
if s.server == nil {
return ClusterInfo{}
}
member := s.server.Cluster().Member(s.server.ID())
if member == nil {
return ClusterInfo{}
}
members := s.server.Cluster().Members()
leaderId := s.server.Leader()
nodes := s.clusterData.parse(leaderId, members...)
return ClusterInfo{
Cluster: s.clusterData.cluster,
Nodes: nodes,
}
}
func (s *_Server) Nodes() []*Node {
s.mu.RLock()
defer s.mu.RUnlock()
if s.server != nil {
members := s.server.Cluster().Members()
leaderId := s.server.Leader()
return s.clusterData.parse(leaderId, members...)
}
return []*Node{}
}
func (s *_Server) Version() Versions {
//s.mu.RLock()
//defer s.mu.RUnlock()
strv := "not_decided"
if s.server != nil {
v := s.server.Cluster().Version()
if v != nil {
strv = v.String()
}
}
return Versions{
Server: version.Version,
Cluster: strv,
}
}
func NewServer(ctx context.Context, mux *http.ServeMux, config Config) (Etcd, error) {
serverCtc, cancel := context.WithCancel(ctx)
s := &_Server{
config: config,
ctx: serverCtc,
cancel: cancel,
requestTimeout: 100 * time.Second,
clientCh: make([]chan *clientv3.Client, 0, 10),
}
s.mu.Lock()
defer s.mu.Unlock()
s.addHandler(mux)
err := s.initEtcdServer()
if err != nil {
return nil, err
}
return s, nil
}
func (s *_Server) Info() *Node {
s.mu.Lock()
defer s.mu.Unlock()
if s.server == nil {
return nil
}
member := s.server.Cluster().Member(s.server.ID())
leaderId := s.server.Leader()
nodes := s.clusterData.parse(leaderId, member)
if len(nodes) < 1 {
return nil
}
return nodes[0]
}
func (s *_Server) IsLeader() (bool, []string) {
s.mu.RLock()
defer s.mu.RUnlock()
return s.isLeader()
}
func (s *_Server) isLeader() (bool, []string) {
server := s.server
lead := server.Leader()
if lead == server.ID() {
return true, nil
}
member := server.Cluster().Member(lead)
if member == nil {
// leader not found，maybe it's removed
return true, nil
}
return false, member.PeerURLs
}
func (s *_Server) Put(key string, value []byte) error {
ctx, _ := s.requestContext()
_, err := s.client.Put(ctx, key, string(value))
return err
}
func (s *_Server) Delete(key string) error {
ctx, _ := s.requestContext()
_, err := s.client.Delete(ctx, key)
return err
}
func (s *_Server) Watch(prefix string, handler ServiceHandler) {
clientCh := make(chan *clientv3.Client, 1)
s.mu.Lock()
s.clientCh = append(s.clientCh, clientCh)
clientCh <- s.client
s.mu.Unlock()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
once := sync.Once{}
var watch clientv3.WatchChan = nil
for {
select {
case client, ok := <-clientCh:
{
if !ok {
continue
}
ctx, _ := s.requestContext()
response, err := client.Get(ctx, prefix, clientv3.WithPrefix())
if err != nil {
log.Warn("watch ", prefix, " error:", err)
clientCh <- client
continue
}
watch = client.Watch(s.ctx, prefix, clientv3.WithPrefix())
init := make([]*KValue, 0, response.Count+1)
for _, kv := range response.Kvs {
init = append(init, &KValue{
Key: kv.Key,
Value: kv.Value,
})
}
//init = append(init, &KValue{
// Key: []byte("/cluster/node"),
// Value: []byte(fmt.Sprintf("{\"cluster_id\":\"%s\",\"node_id\":\"%s\"}", s.clusterData.cluster, s.server.ID().String())),
//})
handler.Reset(init)
once.Do(func() {
wg.Done()
})
}
case <-s.ctx.Done():
return
case v, ok := <-watch:
if !ok {
watch = nil
continue
}
for _, e := range v.Events {
switch e.Type {
case mvccpb.DELETE:
_ = handler.Delete(string(e.Kv.Key))
case mvccpb.PUT:
_ = handler.Put(string(e.Kv.Key), e.Kv.Value)
}
}
}
}
}()
wg.Wait()
}
func (s *_Server) requestContext() (context.Context, context.CancelFunc) {
return context.WithTimeout(s.ctx, s.requestTimeout)
}