go.etcd.io/etcd@v3.3.27+incompatible/clientv3/balancer/utils.go (about)

     1  // Copyright 2018 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package balancer
    16  
    17  import (
    18  	"fmt"
    19  	"net/url"
    20  	"sort"
    21  	"sync/atomic"
    22  	"time"
    23  
    24  	"google.golang.org/grpc/balancer"
    25  	"google.golang.org/grpc/resolver"
    26  )
    27  
    28  func scToString(sc balancer.SubConn) string {
    29  	return fmt.Sprintf("%p", sc)
    30  }
    31  
    32  func scsToStrings(scs map[balancer.SubConn]resolver.Address) (ss []string) {
    33  	ss = make([]string, 0, len(scs))
    34  	for sc, a := range scs {
    35  		ss = append(ss, fmt.Sprintf("%s (%s)", a.Addr, scToString(sc)))
    36  	}
    37  	sort.Strings(ss)
    38  	return ss
    39  }
    40  
    41  func addrsToStrings(addrs []resolver.Address) (ss []string) {
    42  	ss = make([]string, len(addrs))
    43  	for i := range addrs {
    44  		ss[i] = addrs[i].Addr
    45  	}
    46  	sort.Strings(ss)
    47  	return ss
    48  }
    49  
    50  func epsToAddrs(eps ...string) (addrs []resolver.Address) {
    51  	addrs = make([]resolver.Address, 0, len(eps))
    52  	for _, ep := range eps {
    53  		u, err := url.Parse(ep)
    54  		if err != nil {
    55  			addrs = append(addrs, resolver.Address{Addr: ep, Type: resolver.Backend})
    56  			continue
    57  		}
    58  		addrs = append(addrs, resolver.Address{Addr: u.Host, Type: resolver.Backend})
    59  	}
    60  	return addrs
    61  }
    62  
    63  var genN = new(uint32)
    64  
    65  func genName() string {
    66  	now := time.Now().UnixNano()
    67  	return fmt.Sprintf("%X%X", now, atomic.AddUint32(genN, 1))
    68  }