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Open-IM-Server/pkg/common/discoveryregister/direct/direct_resolver.go

97 lines
2.2 KiB

// Copyright © 2024 OpenIM. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package direct
import (
"context"
"math/rand"
"strings"
"github.com/openimsdk/tools/log"
"google.golang.org/grpc/resolver"
)
const (
slashSeparator = "/"
// EndpointSepChar is the separator char in endpoints.
EndpointSepChar = ','
subsetSize = 32
scheme = "direct"
)
type ResolverDirect struct {
}
func NewResolverDirect() *ResolverDirect {
return &ResolverDirect{}
}
func (rd *ResolverDirect) Build(target resolver.Target, cc resolver.ClientConn, _ resolver.BuildOptions) (
resolver.Resolver, error) {
log.ZDebug(context.Background(), "Build", "target", target)
endpoints := strings.FieldsFunc(GetEndpoints(target), func(r rune) bool {
return r == EndpointSepChar
})
endpoints = subset(endpoints, subsetSize)
addrs := make([]resolver.Address, 0, len(endpoints))
for _, val := range endpoints {
addrs = append(addrs, resolver.Address{
Addr: val,
})
}
if err := cc.UpdateState(resolver.State{
Addresses: addrs,
}); err != nil {
return nil, err
}
return &nopResolver{cc: cc}, nil
}
func init() {
resolver.Register(&ResolverDirect{})
}
func (rd *ResolverDirect) Scheme() string {
return scheme // return your custom scheme name
}
// GetEndpoints returns the endpoints from the given target.
func GetEndpoints(target resolver.Target) string {
return strings.Trim(target.URL.Path, slashSeparator)
}
func subset(set []string, sub int) []string {
rand.Shuffle(len(set), func(i, j int) {
set[i], set[j] = set[j], set[i]
})
if len(set) <= sub {
return set
}
return set[:sub]
}
type nopResolver struct {
cc resolver.ClientConn
}
func (n nopResolver) ResolveNow(options resolver.ResolveNowOptions) {
}
func (n nopResolver) Close() {
}