mirror of https://github.com/k3s-io/k3s
75 lines
2.2 KiB
Go
75 lines
2.2 KiB
Go
// Copyright 2021 The etcd Authors
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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 resolver
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import (
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"go.etcd.io/etcd/client/v3/internal/endpoint"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/resolver/manual"
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"google.golang.org/grpc/serviceconfig"
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)
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const (
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Schema = "etcd-endpoints"
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)
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// EtcdManualResolver is a Resolver (and resolver.Builder) that can be updated
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// using SetEndpoints.
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type EtcdManualResolver struct {
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*manual.Resolver
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endpoints []string
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serviceConfig *serviceconfig.ParseResult
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}
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func New(endpoints ...string) *EtcdManualResolver {
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r := manual.NewBuilderWithScheme(Schema)
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return &EtcdManualResolver{Resolver: r, endpoints: endpoints, serviceConfig: nil}
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}
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// Build returns itself for Resolver, because it's both a builder and a resolver.
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func (r *EtcdManualResolver) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
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r.serviceConfig = cc.ParseServiceConfig(`{"loadBalancingPolicy": "round_robin"}`)
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if r.serviceConfig.Err != nil {
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return nil, r.serviceConfig.Err
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}
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res, err := r.Resolver.Build(target, cc, opts)
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if err != nil {
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return nil, err
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}
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// Populates endpoints stored in r into ClientConn (cc).
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r.updateState()
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return res, nil
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}
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func (r *EtcdManualResolver) SetEndpoints(endpoints []string) {
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r.endpoints = endpoints
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r.updateState()
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}
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func (r EtcdManualResolver) updateState() {
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if r.CC != nil {
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addresses := make([]resolver.Address, len(r.endpoints))
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for i, ep := range r.endpoints {
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addr, serverName := endpoint.Interpret(ep)
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addresses[i] = resolver.Address{Addr: addr, ServerName: serverName}
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}
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state := resolver.State{
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Addresses: addresses,
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ServiceConfig: r.serviceConfig,
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}
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r.UpdateState(state)
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}
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}
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