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Update Backend interface to latest iteration 

What will hopfully be the final version of the Backend interface. This
combines the MultiState interface into Backend since it will be required
to implement, and simplifies the interface because the Backend is no
longer responsible for tracking the current state.
This commit is contained in:
James Bardin 2017-02-27 14:00:18 -05:00
parent 7f453f3341
commit 96194fbc0d
2 changed files with 18 additions and 21 deletions
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26
backend/backend.go
View File

@ -26,23 +26,21 @@ type Backend interface {
// not be loaded locally: the proper APIs should be called on state.State // not be loaded locally: the proper APIs should be called on state.State
// to load the state. If the state.State is a state.Locker, it's up to the // to load the state. If the state.State is a state.Locker, it's up to the
// caller to call Lock and Unlock as needed. // caller to call Lock and Unlock as needed.
State() (state.State, error) //
} // If the named state doesn't exist it will be created. The "default" state
// is always assumed to exist.
State(name string) (state.State, error)
// MultiState is an interface that a backend can implement to allow changing // DeleteState removes the named state if it exists. It is an error
// between named states depending on the configured environment.
type MultiState interface {
// States returns a list of configured named states and the current state.
States() ([]string, string, error)
// ChangeState changes to the named state. If the named state doesn't exist
// it will be created.
ChangeState(name string) error
// DeleteState removes the named state if it exists. If the current state is
// deleted, the backend should change to the default state. It is an error
// to delete the default state. // to delete the default state.
//
// DeleteState does not prevent deleting a state that is in use. It is the
// responsibility of the caller to hold a Lock on the state when calling
// this method.
DeleteState(name string) error DeleteState(name string) error
// States returns a list of configured named states.
States() ([]string, error)
} }
// Enhanced implements additional behavior on top of a normal backend. // Enhanced implements additional behavior on top of a normal backend.

13
backend/nil.go
View File

@ -25,16 +25,15 @@ func (Nil) Configure(*terraform.ResourceConfig) error {
return nil return nil
} }
func (Nil) State() (state.State, error) { func (Nil) State(string) (state.State, error) {
// We have to return a non-nil state to adhere to the interface // We have to return a non-nil state to adhere to the interface
return &state.InmemState{}, nil return &state.InmemState{}, nil
} }
func (Nil) States() ([]string, string, error) { func (Nil) DeleteState(string) error {
// The default state always exists
return []string{DefaultStateName}, DefaultStateName, nil
}
func (Nil) ChangeState(string) error {
return nil return nil
} }
func (Nil) States() ([]string, error) {
return []string{DefaultStateName}, nil
}