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utils.go
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utils.go
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// Copyright 2018 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 balancer
import (
"fmt"
"net/url"
"sort"
"sync/atomic"
"time"
"google.golang.org/grpc/balancer"
"google.golang.org/grpc/resolver"
)
func scToString(sc balancer.SubConn) string {
return fmt.Sprintf("%p", sc)
}
func scsToStrings(scs map[balancer.SubConn]resolver.Address) (ss []string) {
ss = make([]string, 0, len(scs))
for sc, a := range scs {
ss = append(ss, fmt.Sprintf("%s (%s)", a.Addr, scToString(sc)))
}
sort.Strings(ss)
return ss
}
func addrsToStrings(addrs []resolver.Address) (ss []string) {
ss = make([]string, len(addrs))
for i := range addrs {
ss[i] = addrs[i].Addr
}
sort.Strings(ss)
return ss
}
func epsToAddrs(eps ...string) (addrs []resolver.Address) {
addrs = make([]resolver.Address, 0, len(eps))
for _, ep := range eps {
u, err := url.Parse(ep)
if err != nil {
addrs = append(addrs, resolver.Address{Addr: ep, Type: resolver.Backend})
continue
}
addrs = append(addrs, resolver.Address{Addr: u.Host, Type: resolver.Backend})
}
return addrs
}
var genN = new(uint32)
func genName() string {
now := time.Now().UnixNano()
return fmt.Sprintf("%X%X", now, atomic.AddUint32(genN, 1))
}