terraform/states/statemgr/statemgr_fake.go

97 lines
2.2 KiB
Go

package statemgr
import (
"errors"
"sync"
"github.com/hashicorp/terraform/states"
)
// NewFullFake returns a full state manager that really only supports transient
// snapshots. This is primarily intended for testing and is not suitable for
// general use.
//
// The persistent part of the interface is stubbed out as an in-memory store,
// and so its snapshots are effectively also transient.
//
// The given Transient implementation is used to implement the transient
// portion of the interface. If nil is given, NewTransientInMemory is
// automatically called to create an in-memory transient manager with no
// initial transient snapshot.
//
// If the given initial state is non-nil then a copy of it will be used as
// the initial persistent snapshot.
//
// The Locker portion of the returned manager uses a local mutex to simulate
// mutually-exclusive access to the fake persistent portion of the object.
func NewFullFake(t Transient, initial *states.State) Full {
if t == nil {
t = NewTransientInMemory(nil)
}
// The "persistent" part of our manager is actually just another in-memory
// transient used to fake a secondary storage layer.
fakeP := NewTransientInMemory(initial.DeepCopy())
return &fakeFull{
t: t,
fakeP: fakeP,
}
}
type fakeFull struct {
t Transient
fakeP Transient
lockLock sync.Mutex
locked bool
}
var _ Full = (*fakeFull)(nil)
func (m *fakeFull) State() *states.State {
return m.t.State()
}
func (m *fakeFull) WriteState(s *states.State) error {
return m.t.WriteState(s)
}
func (m *fakeFull) RefreshState() error {
return m.t.WriteState(m.fakeP.State())
}
func (m *fakeFull) PersistState() error {
return m.fakeP.WriteState(m.t.State())
}
func (m *fakeFull) Lock(info *LockInfo) (string, error) {
m.lockLock.Lock()
defer m.lockLock.Unlock()
if m.locked {
return "", &LockError{
Err: errors.New("fake state manager is locked"),
Info: info,
}
}
m.locked = true
return "placeholder", nil
}
func (m *fakeFull) Unlock(id string) error {
m.lockLock.Lock()
defer m.lockLock.Unlock()
if !m.locked {
return errors.New("fake state manager is not locked")
}
if id != "placeholder" {
return errors.New("wrong lock id for fake state manager")
}
m.locked = false
return nil
}