github.heygears.com/openimsdk/tools@v0.0.49/discovery/zookeeper/resolver.go (about)

     1  // Copyright © 2023 OpenIM. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package zookeeper
    16  
    17  import (
    18  	"context"
    19  	"strings"
    20  
    21  	"google.golang.org/grpc/resolver"
    22  )
    23  
    24  type Resolver struct {
    25  	client         *ZkClient
    26  	target         resolver.Target
    27  	cc             resolver.ClientConn
    28  	addrs          []resolver.Address
    29  	getConnsRemote func(ctx context.Context, serviceName string) (conns []resolver.Address, err error)
    30  }
    31  
    32  func (r *Resolver) ResolveNowZK(o resolver.ResolveNowOptions) {
    33  	serviceName := strings.TrimLeft(r.target.URL.Path, "/")
    34  	r.client.logger.Debug(context.Background(), "start resolve now", "target", r.target, "serviceName", serviceName)
    35  	newConns, err := r.getConnsRemote(context.Background(), serviceName)
    36  	if err != nil {
    37  		r.client.logger.Error(context.Background(), "resolve now error", err, "target", r.target, "serviceName", serviceName)
    38  		return
    39  	}
    40  	r.addrs = newConns
    41  	if err := r.cc.UpdateState(resolver.State{Addresses: newConns}); err != nil {
    42  		r.client.logger.Error(context.Background(), "UpdateState error, conns is nil from svr", err, "conns", newConns, "zk path", r.target.URL.Path, "serviceName", serviceName)
    43  		return
    44  	}
    45  	r.client.logger.Debug(context.Background(), "resolve now finished", "target", r.target, "conns", r.addrs, "serviceName", serviceName)
    46  }
    47  
    48  func (r *Resolver) ResolveNow(o resolver.ResolveNowOptions) {}
    49  
    50  func (r *Resolver) Close() {}
    51  
    52  func (s *ZkClient) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
    53  	s.logger.Debug(context.Background(), "build resolver", "target", target, "cc", cc.UpdateState)
    54  	serviceName := strings.TrimLeft(target.URL.Path, "/")
    55  	r := &Resolver{client: s}
    56  	r.target = target
    57  	r.cc = cc
    58  	r.getConnsRemote = s.GetConnsRemote
    59  	r.ResolveNowZK(resolver.ResolveNowOptions{})
    60  	s.lock.Lock()
    61  	defer s.lock.Unlock()
    62  	s.resolvers[serviceName] = r
    63  	s.logger.Debug(context.Background(), "build resolver finished", "target", target, "cc", cc.UpdateState, "key", serviceName)
    64  	return r, nil
    65  }
    66  
    67  func (s *ZkClient) Scheme() string { return s.scheme }