go.etcd.io/etcd@v3.3.27+incompatible/pkg/types/urlsmap.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 "fmt" 19 "sort" 20 "strings" 21 ) 22 23 // URLsMap is a map from a name to its URLs. 24 type URLsMap map[string]URLs 25 26 // NewURLsMap returns a URLsMap instantiated from the given string, 27 // which consists of discovery-formatted names-to-URLs, like: 28 // mach0=http://1.1.1.1:2380,mach0=http://2.2.2.2::2380,mach1=http://3.3.3.3:2380,mach2=http://4.4.4.4:2380 29 func NewURLsMap(s string) (URLsMap, error) { 30 m := parse(s) 31 32 cl := URLsMap{} 33 for name, urls := range m { 34 us, err := NewURLs(urls) 35 if err != nil { 36 return nil, err 37 } 38 cl[name] = us 39 } 40 return cl, nil 41 } 42 43 // NewURLsMapFromStringMap takes a map of strings and returns a URLsMap. The 44 // string values in the map can be multiple values separated by the sep string. 45 func NewURLsMapFromStringMap(m map[string]string, sep string) (URLsMap, error) { 46 var err error 47 um := URLsMap{} 48 for k, v := range m { 49 um[k], err = NewURLs(strings.Split(v, sep)) 50 if err != nil { 51 return nil, err 52 } 53 } 54 return um, nil 55 } 56 57 // String turns URLsMap into discovery-formatted name-to-URLs sorted by name. 58 func (c URLsMap) String() string { 59 var pairs []string 60 for name, urls := range c { 61 for _, url := range urls { 62 pairs = append(pairs, fmt.Sprintf("%s=%s", name, url.String())) 63 } 64 } 65 sort.Strings(pairs) 66 return strings.Join(pairs, ",") 67 } 68 69 // URLs returns a list of all URLs. 70 // The returned list is sorted in ascending lexicographical order. 71 func (c URLsMap) URLs() []string { 72 var urls []string 73 for _, us := range c { 74 for _, u := range us { 75 urls = append(urls, u.String()) 76 } 77 } 78 sort.Strings(urls) 79 return urls 80 } 81 82 // Len returns the size of URLsMap. 83 func (c URLsMap) Len() int { 84 return len(c) 85 } 86 87 // parse parses the given string and returns a map listing the values specified for each key. 88 func parse(s string) map[string][]string { 89 m := make(map[string][]string) 90 for s != "" { 91 key := s 92 if i := strings.IndexAny(key, ","); i >= 0 { 93 key, s = key[:i], key[i+1:] 94 } else { 95 s = "" 96 } 97 if key == "" { 98 continue 99 } 100 value := "" 101 if i := strings.Index(key, "="); i >= 0 { 102 key, value = key[:i], key[i+1:] 103 } 104 m[key] = append(m[key], value) 105 } 106 return m 107 }