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