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action.go
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action.go
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package nft
import (
"fmt"
"regexp"
"sync"
)
// Action represents available and supported by the implementation actions.
// This is just a string type alias, but using it increase the clarity of the
// API.
type Action string
// nft package provides default set of actions.
const (
UpdateDetails Action = "ActionUpdateDetails"
Transfer Action = "ActionTransfer"
UpdateApprovals Action = "ActionUpdateApprovals"
)
// DefaultActions lists all the actions that need to be registered for nft to work
var DefaultActions = []Action{
UpdateApprovals, UpdateDetails, Transfer,
}
// RegisterAction introduce an Action to the extension.
//
// Every action must be registered before being used. This is a mandatory step
// so that the validation process can regcognise known actions. Registration is
// global.
// Registration should be done during the program initialization phase. Failed
// registration result in panic.
func RegisterAction(actions ...Action) {
validActions.Lock()
defer validActions.Unlock()
for _, a := range actions {
if !validActionString(string(a)) {
panic(fmt.Sprintf("invalid action name: %s", a))
}
validActions.set[a] = struct{}{}
}
}
// Because we allow clients to register any action string, we must ensure that
// certain convention is preserved.
var validActionString = regexp.MustCompile(`^[A-Za-z]{4,32}$`).MatchString
var validActions = struct {
sync.RWMutex
set map[Action]struct{}
}{
set: map[Action]struct{}{},
}
// isValidAction returns true if given value is a valid action name. Action can
// be of type string or Action.
func isValidAction(action interface{}) bool {
var name Action
switch a := action.(type) {
case Action:
name = a
case string:
name = Action(a)
default:
return false
}
validActions.RLock()
_, ok := validActions.set[name]
validActions.RUnlock()
return ok
}