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117 lines
3.5 KiB
117 lines
3.5 KiB
package zookeeper
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import (
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"context"
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"fmt"
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"io"
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"strings"
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"sync"
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"github.com/pkg/errors"
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"github.com/go-zookeeper/zk"
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"google.golang.org/grpc"
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"google.golang.org/grpc/resolver"
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)
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var ErrConnIsNil = errors.New("conn is nil")
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var ErrConnIsNilButLocalNotNil = errors.New("conn is nil, but local is not nil")
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func (s *ZkClient) watch(wg *sync.WaitGroup) {
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for {
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event := <-s.eventChan
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switch event.Type {
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case zk.EventSession:
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s.logger.Printf("zk session event: %+v", event)
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case zk.EventNodeChildrenChanged:
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s.logger.Printf("zk event: %s", event.Path)
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l := strings.Split(event.Path, "/")
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if len(l) > 1 {
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s.lock.Lock()
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rpcName := l[len(l)-1]
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s.flushResolver(rpcName)
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if len(s.localConns[rpcName]) != 0 {
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delete(s.localConns, rpcName)
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}
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s.lock.Unlock()
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}
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s.logger.Printf("zk event handle success: %s", event.Path)
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case zk.EventNodeDataChanged:
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case zk.EventNodeCreated:
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case zk.EventNodeDeleted:
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case zk.EventNotWatching:
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}
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}
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}
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func (s *ZkClient) GetConnsRemote(serviceName string) (conns []resolver.Address, err error) {
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path := s.getPath(serviceName)
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childNodes, _, err := s.conn.Children(path)
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if err != nil {
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return nil, errors.Wrap(err, "get children error")
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}
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for _, child := range childNodes {
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fullPath := path + "/" + child
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data, _, err := s.conn.Get(fullPath)
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if err != nil {
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if err == zk.ErrNoNode {
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return nil, errors.Wrap(err, "this is zk ErrNoNode")
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}
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return nil, errors.Wrap(err, "get children error")
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}
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conns = append(conns, resolver.Address{Addr: string(data), ServerName: serviceName})
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}
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_, _, _, err = s.conn.ChildrenW(s.getPath(serviceName))
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if err != nil {
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return nil, errors.Wrap(err, "children watch error")
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}
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if len(conns) == 0 {
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return nil, fmt.Errorf("no conn for service %s, grpc server may not exist, local conn is %v, please check zookeeper server %v, path: %s", serviceName, s.localConns, s.zkServers, s.zkRoot)
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}
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return conns, nil
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}
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func (s *ZkClient) GetConns(ctx context.Context, serviceName string, opts ...grpc.DialOption) ([]grpc.ClientConnInterface, error) {
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s.logger.Printf("get conns from client, serviceName: %s", serviceName)
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s.lock.Lock()
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defer s.lock.Unlock()
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opts = append(s.options, opts...)
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conns := s.localConns[serviceName]
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if len(conns) == 0 {
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var err error
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s.logger.Printf("get conns from zk remote, serviceName: %s", serviceName)
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conns, err = s.GetConnsRemote(serviceName)
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if err != nil {
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return nil, err
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}
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s.localConns[serviceName] = conns
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}
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var ret []grpc.ClientConnInterface
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s.logger.Printf("get conns from zk success, serviceName: %s", serviceName)
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for _, conn := range conns {
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cc, err := grpc.DialContext(ctx, conn.Addr, append(s.options, opts...)...)
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if err != nil {
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return nil, errors.Wrap(err, fmt.Sprintf("conns dialContext error, conn: %s", conn.Addr))
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}
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ret = append(ret, newClientConnInterface(cc))
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}
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s.logger.Printf("dial ctx success, serviceName: %s", serviceName)
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return ret, nil
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}
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func (s *ZkClient) GetConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (grpc.ClientConnInterface, error) {
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newOpts := append(s.options, grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"LoadBalancingPolicy": "%s"}`, s.balancerName)))
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cc, err := grpc.DialContext(ctx, fmt.Sprintf("%s:///%s", s.scheme, serviceName), append(newOpts, opts...)...)
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if err != nil {
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return nil, err
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}
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return newClientConnInterface(cc), nil
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}
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func (s *ZkClient) CloseConn(conn grpc.ClientConnInterface) {
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if closer, ok := conn.(io.Closer); ok {
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closer.Close()
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}
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}
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