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// Copyright 2019 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package names
import (
"fmt"
"regexp"
"strconv"
)
// ControllerAgentTagKind indicates that a tag belongs to a controller agent.
const ControllerAgentTagKind = "controller"
var validControllerAgentId = regexp.MustCompile("^" + NumberSnippet + "$")
// ControllerAgentTag represents a tag used to describe a controller.
type ControllerAgentTag struct {
id string
}
// NewControllerAgentTag returns the tag of an controller agent with the given id.
func NewControllerAgentTag(id string) ControllerAgentTag {
_, err := strconv.Atoi(id)
if err != nil {
panic(fmt.Sprintf("%q is not a valid controller agent id", id))
}
return ControllerAgentTag{id: id}
}
// ParseControllerAgentTag parses a controller agent tag string.
func ParseControllerAgentTag(controllerAgentTag string) (ControllerAgentTag, error) {
tag, err := ParseTag(controllerAgentTag)
if err != nil {
return ControllerAgentTag{}, err
}
et, ok := tag.(ControllerAgentTag)
if !ok {
return ControllerAgentTag{}, invalidTagError(controllerAgentTag, ControllerAgentTagKind)
}
return et, nil
}
// Number returns the controller agent number.
func (t ControllerAgentTag) Number() int {
n, _ := strconv.Atoi(t.Id())
return n
}
// String implements Tag.
func (t ControllerAgentTag) String() string { return t.Kind() + "-" + t.Id() }
// Kind implements Tag.
func (t ControllerAgentTag) Kind() string { return ControllerAgentTagKind }
// Id implements Tag.
func (t ControllerAgentTag) Id() string { return t.id }
// IsValidControllerAgent returns whether id is a valid controller agent id.
func IsValidControllerAgent(id string) bool {
return validControllerAgentId.MatchString(id)
}
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