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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package names
import (
"fmt"
"regexp"
"strings"
)
const (
StorageTagKind = "storage"
// StorageNameSnippet is the regular expression that describes valid
// storage names (without the storage instance sequence number).
StorageNameSnippet = "(?:[a-z][a-z0-9]*(?:-[a-z0-9]*[a-z][a-z0-9]*)*)"
)
var validStorage = regexp.MustCompile("^(" + StorageNameSnippet + ")/" + NumberSnippet + "$")
type StorageTag struct {
id string
}
func (t StorageTag) String() string { return t.Kind() + "-" + t.id }
func (t StorageTag) Kind() string { return StorageTagKind }
func (t StorageTag) Id() string { return storageTagSuffixToId(t.id) }
// NewStorageTag returns the tag for the storage instance with the given ID.
// It will panic if the given string is not a valid storage instance Id.
func NewStorageTag(id string) StorageTag {
tag, ok := tagFromStorageId(id)
if !ok {
panic(fmt.Sprintf("%q is not a valid storage instance ID", id))
}
return tag
}
// ParseStorageTag parses a storage tag string.
func ParseStorageTag(s string) (StorageTag, error) {
tag, err := ParseTag(s)
if err != nil {
return StorageTag{}, err
}
st, ok := tag.(StorageTag)
if !ok {
return StorageTag{}, invalidTagError(s, StorageTagKind)
}
return st, nil
}
// IsValidStorage returns whether id is a valid storage instance ID.
func IsValidStorage(id string) bool {
return validStorage.MatchString(id)
}
// StorageName returns the storage name from a storage instance ID.
// StorageName returns an error if "id" is not a valid storage
// instance ID.
func StorageName(id string) (string, error) {
s := validStorage.FindStringSubmatch(id)
if s == nil {
return "", fmt.Errorf("%q is not a valid storage instance ID", id)
}
return s[1], nil
}
func tagFromStorageId(id string) (StorageTag, bool) {
// replace only the last "/" with "-".
i := strings.LastIndex(id, "/")
if i <= 0 || !IsValidStorage(id) {
return StorageTag{}, false
}
id = id[:i] + "-" + id[i+1:]
return StorageTag{id}, true
}
func storageTagSuffixToId(s string) string {
// Replace only the last "-" with "/", as it is valid for storage
// names to contain hyphens.
if i := strings.LastIndex(s, "-"); i > 0 {
s = s[:i] + "/" + s[i+1:]
}
return s
}
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