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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package names
import (
"fmt"
"regexp"
"strings"
)
const RelationSnippet = "[a-z][a-z0-9]*([_-][a-z0-9]+)*"
// Relation keys have the format "service1:relName1 service2:relName2".
// Except the peer relations, which have the format "service:relName"
// Relation tags have the format "relation-service1.rel1#service2.rel2".
// For peer relations, the format is "relation-service.rel"
var (
validRelation = regexp.MustCompile("^" + ServiceSnippet + ":" + RelationSnippet + " " + ServiceSnippet + ":" + RelationSnippet + "$")
validPeerRelation = regexp.MustCompile("^" + ServiceSnippet + ":" + RelationSnippet + "$")
)
// IsRelation returns whether key is a valid relation key.
func IsRelation(key string) bool {
return validRelation.MatchString(key) || validPeerRelation.MatchString(key)
}
// RelationTag returns the tag for the relation with the given key.
func RelationTag(relationKey string) string {
if !IsRelation(relationKey) {
panic(fmt.Sprintf("%q is not a valid relation key", relationKey))
}
// Replace both ":" with "." and the " " with "#".
relationKey = strings.Replace(relationKey, ":", ".", 2)
relationKey = strings.Replace(relationKey, " ", "#", 1)
return makeTag(RelationTagKind, relationKey)
}
func relationTagSuffixToKey(s string) string {
// Replace both "." with ":" and the "#" with " ".
s = strings.Replace(s, ".", ":", 2)
return strings.Replace(s, "#", " ", 1)
}
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