package command import ( "sync" "github.com/hashicorp/terraform/terraform" ) // CountHook is a hook that counts the number of resources // added, removed, changed during the course of an apply. type CountHook struct { Added int Changed int Removed int ToAdd int ToChange int ToRemove int ToRemoveAndAdd int pending map[string]countHookAction sync.Mutex terraform.NilHook } type countHookAction byte const ( countHookActionAdd countHookAction = iota countHookActionChange countHookActionRemove ) func (h *CountHook) Reset() { h.Lock() defer h.Unlock() h.pending = nil h.Added = 0 h.Changed = 0 h.Removed = 0 } func (h *CountHook) PreApply( n *terraform.InstanceInfo, s *terraform.InstanceState, d *terraform.InstanceDiff) (terraform.HookAction, error) { h.Lock() defer h.Unlock() if h.pending == nil { h.pending = make(map[string]countHookAction) } action := countHookActionChange if d.Destroy { action = countHookActionRemove } else if s.ID == "" { action = countHookActionAdd } h.pending[n.HumanId()] = action return terraform.HookActionContinue, nil } func (h *CountHook) PostApply( n *terraform.InstanceInfo, s *terraform.InstanceState, e error) (terraform.HookAction, error) { h.Lock() defer h.Unlock() if h.pending != nil { if a, ok := h.pending[n.HumanId()]; ok { delete(h.pending, n.HumanId()) if e == nil { switch a { case countHookActionAdd: h.Added += 1 case countHookActionChange: h.Changed += 1 case countHookActionRemove: h.Removed += 1 } } } } return terraform.HookActionContinue, nil } func (h *CountHook) PostDiff( n *terraform.InstanceInfo, d *terraform.InstanceDiff) ( terraform.HookAction, error) { h.Lock() defer h.Unlock() switch d.ChangeType() { case terraform.DiffDestroyCreate: h.ToRemoveAndAdd += 1 case terraform.DiffCreate: h.ToAdd += 1 case terraform.DiffDestroy: h.ToRemove += 1 default: h.ToChange += 1 } return terraform.HookActionContinue, nil }