builder

pkg/discoveryregistry/zookeeper/discover.go

@@ -0,0 +1,110 @@
+package openKeeper
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"sync"
+
+	"github.com/pkg/errors"
+
+	"github.com/go-zookeeper/zk"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/resolver"
+)
+
+var ErrConnIsNil = errors.New("conn is nil")
+var ErrConnIsNilButLocalNotNil = errors.New("conn is nil, but local is not nil")
+
+func (s *ZkClient) watch(wg *sync.WaitGroup) {
+	wg.Done()
+	for {
+		event := <-s.eventChan
+		switch event.Type {
+		case zk.EventSession:
+		case zk.EventNodeCreated:
+		case zk.EventNodeChildrenChanged:
+			l := strings.Split(event.Path, "/")
+			s.lock.Lock()
+			if len(l) > 1 {
+				rpcName := l[len(l)-1]
+				s.flushResolver(rpcName)
+				if len(s.localConns[rpcName]) != 0 {
+					delete(s.localConns, rpcName)
+				}
+			}
+			s.lock.Unlock()
+		case zk.EventNodeDataChanged:
+		case zk.EventNodeDeleted:
+		case zk.EventNotWatching:
+		}
+	}
+
+}
+
+func (s *ZkClient) GetConnsRemote(serviceName string) (conns []resolver.Address, err error) {
+	path := s.getPath(serviceName)
+	childNodes, _, err := s.conn.Children(path)
+	if err != nil {
+		return nil, errors.Wrap(err, "get children error")
+	}
+	for _, child := range childNodes {
+		fullPath := path + "/" + child
+		data, _, err := s.conn.Get(fullPath)
+		if err != nil {
+			if err == zk.ErrNoNode {
+				return nil, errors.Wrap(err, "this is zk ErrNoNode")
+			}
+			return nil, errors.Wrap(err, "get children error")
+		}
+		conns = append(conns, resolver.Address{Addr: string(data), ServerName: serviceName})
+	}
+	_, _, _, err = s.conn.ChildrenW(s.getPath(serviceName))
+	if err != nil {
+		return nil, errors.Wrap(err, "children watch error")
+	}
+	if len(conns) == 0 {
+		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)
+	}
+	return conns, nil
+}
+
+func (s *ZkClient) GetConns(ctx context.Context, serviceName string, opts ...grpc.DialOption) ([]*grpc.ClientConn, error) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	opts = append(s.options, opts...)
+	conns := s.localConns[serviceName]
+	if len(conns) == 0 {
+		var err error
+		conns, err = s.GetConnsRemote(serviceName)
+		if err != nil {
+			return nil, err
+		}
+		s.localConns[serviceName] = conns
+	}
+	var ret []*grpc.ClientConn
+	for _, conn := range conns {
+		c, err := grpc.DialContext(ctx, conn.Addr, append(s.options, opts...)...)
+		if err != nil {
+			return nil, errors.Wrap(err, fmt.Sprintf("conns dialContext error, conn: %s", conn.Addr))
+		}
+		ret = append(ret, c)
+	}
+	return ret, nil
+}
+
+func (s *ZkClient) GetConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
+	newOpts := append(s.options, grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"LoadBalancingPolicy": "%s"}`, s.balancerName)))
+	return grpc.DialContext(ctx, fmt.Sprintf("%s:///%s", s.scheme, serviceName), append(newOpts, opts...)...)
+}
+
+func (s *ZkClient) GetFirstConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
+	conns, err := s.GetConns(ctx, serviceName, opts...)
+	if err != nil {
+		return nil, err
+	}
+	if len(conns) == 0 {
+		return nil, ErrConnIsNil
+	}
+	return conns[0], nil
+}