Open-IM-Server/pkg/discoveryregistry/zookeeper/resolver.go

package zookeeper

import (
	"context"
	"strings"

	"github.com/OpenIMSDK/Open-IM-Server/pkg/common/log"

	"google.golang.org/grpc/resolver"
)

type Resolver struct {
	target resolver.Target
	cc     resolver.ClientConn
	addrs  []resolver.Address

	getConnsRemote func(serviceName string) (conns []resolver.Address, err error)
}

func (r *Resolver) ResolveNowZK(o resolver.ResolveNowOptions) {
	log.ZDebug(context.Background(), "start resolve now", "target", r.target, "cc", r.cc.UpdateState, "serviceName", strings.TrimLeft(r.target.URL.Path, "/"))
	newConns, err := r.getConnsRemote(strings.TrimLeft(r.target.URL.Path, "/"))
	if err != nil {
		log.ZError(context.Background(), "resolve now error", err, "target", r.target)
		return
	}
	r.addrs = newConns
	if err := r.cc.UpdateState(resolver.State{Addresses: newConns}); err != nil {
		log.ZError(context.Background(), "UpdateState error, conns is nil from svr", err, "conns", newConns, "zk path", r.target.URL.Path)
		return
	}
	log.ZDebug(context.Background(), "resolve now finished", "target", r.target, "conns", r.addrs)
}

func (r *Resolver) ResolveNow(o resolver.ResolveNowOptions) {}

func (s *Resolver) Close() {}

func (s *ZkClient) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
	s.logger.Printf("build resolver: %+v, cc: %+v", target, cc.UpdateState)
	// log.ZDebug(context.Background(), "build resolver start", "target", target, "cc", cc.UpdateState)
	r := &Resolver{}
	r.target = target
	r.cc = cc
	r.getConnsRemote = s.GetConnsRemote
	r.ResolveNowZK(resolver.ResolveNowOptions{})
	s.lock.Lock()
	defer s.lock.Unlock()
	serviceName := strings.TrimLeft(target.URL.Path, "/")
	s.resolvers[serviceName] = r
	s.logger.Printf("build resolver finished: %+v, cc: %+v, key: %s", target, cc.UpdateState, serviceName)
	// log.ZDebug(context.Background(), "build resolver finished", "target", target, "cc", cc.UpdateState, "serviceName", serviceName)
	return r, nil
}

func (s *ZkClient) Scheme() string { return s.scheme }