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Viewing changes to names/unit.go

  • Committer: Dimiter Naydenov
  • Date: 2013-07-29 15:15:41 UTC
  • mto: This revision was merged to the branch mainline in revision 1565.
  • Revision ID: dimiter.naydenov@canonical.com-20130729151541-zm8murwo9u7mtsdu
names: new package

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names/unit.go
 
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// Copyright 2013 Canonical Ltd.
 
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// Licensed under the AGPLv3, see LICENCE file for details.
 
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package names
 
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import (
 
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        "fmt"
 
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        "regexp"
 
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        "strings"
 
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)
 
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var validUnit = regexp.MustCompile("^" + ServiceSnippet + "/" + NumberSnippet + "$")
 
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// UnitTag returns the tag for the unit with the given name.
 
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func UnitTag(unitName string) string {
 
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        return UnitTagPrefix + strings.Replace(unitName, "/", "-", -1)
 
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}
 
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// UnitNameFromTag returns the unit name that was used to create the tag.
 
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func UnitNameFromTag(tag string) (string, error) {
 
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        if !strings.HasPrefix(tag, UnitTagPrefix) {
 
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                return "", fmt.Errorf("invalid unit tag format: %v", tag)
 
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        }
 
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        // Strip off the "unit-" prefix.
 
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        name := tag[len(UnitTagPrefix):]
 
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        // Put the slashes back.
 
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        name = strings.Replace(name, "-", "/", -1)
 
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        return name, nil
 
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}
 
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// IsUnitName returns whether name is a valid unit name.
 
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func IsUnitName(name string) bool {
 
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        return validUnit.MatchString(name)
 
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}