go.etcd.io/etcd@v3.3.27+incompatible/pkg/types/urls.go (about)

     1  // Copyright 2015 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 types
    16  
    17  import (
    18  	"errors"
    19  	"fmt"
    20  	"net"
    21  	"net/url"
    22  	"sort"
    23  	"strings"
    24  )
    25  
    26  type URLs []url.URL
    27  
    28  func NewURLs(strs []string) (URLs, error) {
    29  	all := make([]url.URL, len(strs))
    30  	if len(all) == 0 {
    31  		return nil, errors.New("no valid URLs given")
    32  	}
    33  	for i, in := range strs {
    34  		in = strings.TrimSpace(in)
    35  		u, err := url.Parse(in)
    36  		if err != nil {
    37  			return nil, err
    38  		}
    39  		if u.Scheme != "http" && u.Scheme != "https" && u.Scheme != "unix" && u.Scheme != "unixs" {
    40  			return nil, fmt.Errorf("URL scheme must be http, https, unix, or unixs: %s", in)
    41  		}
    42  		if _, _, err := net.SplitHostPort(u.Host); err != nil {
    43  			return nil, fmt.Errorf(`URL address does not have the form "host:port": %s`, in)
    44  		}
    45  		if u.Path != "" {
    46  			return nil, fmt.Errorf("URL must not contain a path: %s", in)
    47  		}
    48  		all[i] = *u
    49  	}
    50  	us := URLs(all)
    51  	us.Sort()
    52  
    53  	return us, nil
    54  }
    55  
    56  func MustNewURLs(strs []string) URLs {
    57  	urls, err := NewURLs(strs)
    58  	if err != nil {
    59  		panic(err)
    60  	}
    61  	return urls
    62  }
    63  
    64  func (us URLs) String() string {
    65  	return strings.Join(us.StringSlice(), ",")
    66  }
    67  
    68  func (us *URLs) Sort() {
    69  	sort.Sort(us)
    70  }
    71  func (us URLs) Len() int           { return len(us) }
    72  func (us URLs) Less(i, j int) bool { return us[i].String() < us[j].String() }
    73  func (us URLs) Swap(i, j int)      { us[i], us[j] = us[j], us[i] }
    74  
    75  func (us URLs) StringSlice() []string {
    76  	out := make([]string, len(us))
    77  	for i := range us {
    78  		out[i] = us[i].String()
    79  	}
    80  
    81  	return out
    82  }