k3s/vendor/go.etcd.io/etcd/etcdserver/api/rafthttp/urlpick.go
Darren Shepherd f4ff2bf3a8 Update vendor
2020-06-06 22:38:12 -07:00

58 lines
1.3 KiB
Go

// Copyright 2015 The etcd Authors
//
// 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 rafthttp
import (
"net/url"
"sync"
"go.etcd.io/etcd/pkg/types"
)
type urlPicker struct {
mu sync.Mutex // guards urls and picked
urls types.URLs
picked int
}
func newURLPicker(urls types.URLs) *urlPicker {
return &urlPicker{
urls: urls,
}
}
func (p *urlPicker) update(urls types.URLs) {
p.mu.Lock()
defer p.mu.Unlock()
p.urls = urls
p.picked = 0
}
func (p *urlPicker) pick() url.URL {
p.mu.Lock()
defer p.mu.Unlock()
return p.urls[p.picked]
}
// unreachable notices the picker that the given url is unreachable,
// and it should use other possible urls.
func (p *urlPicker) unreachable(u url.URL) {
p.mu.Lock()
defer p.mu.Unlock()
if u == p.urls[p.picked] {
p.picked = (p.picked + 1) % len(p.urls)
}
}