terraform/backend/local/hook_count.go

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package local
import (
"sync"
"github.com/zclconf/go-cty/cty"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/plans"
"github.com/hashicorp/terraform/states"
"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]plans.Action
sync.Mutex
terraform.NilHook
}
var _ terraform.Hook = (*CountHook)(nil)
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(addr addrs.AbsResourceInstance, gen states.Generation, action plans.Action, priorState, plannedNewState cty.Value) (terraform.HookAction, error) {
h.Lock()
defer h.Unlock()
if h.pending == nil {
h.pending = make(map[string]plans.Action)
}
h.pending[addr.String()] = action
return terraform.HookActionContinue, nil
}
func (h *CountHook) PostApply(addr addrs.AbsResourceInstance, gen states.Generation, newState cty.Value, err error) (terraform.HookAction, error) {
h.Lock()
defer h.Unlock()
if h.pending != nil {
pendingKey := addr.String()
if action, ok := h.pending[pendingKey]; ok {
delete(h.pending, pendingKey)
if err == nil {
switch action {
case plans.CreateThenDelete, plans.DeleteThenCreate:
h.Added++
h.Removed++
case plans.Create:
h.Added++
case plans.Delete:
h.Changed++
case plans.Update:
h.Removed++
}
}
}
}
return terraform.HookActionContinue, nil
}
func (h *CountHook) PostDiff(addr addrs.AbsResourceInstance, gen states.Generation, action plans.Action, priorState, plannedNewState cty.Value) (terraform.HookAction, error) {
h.Lock()
defer h.Unlock()
// We don't count anything for data resources
if addr.Resource.Resource.Mode == addrs.DataResourceMode {
return terraform.HookActionContinue, nil
}
switch action {
case plans.CreateThenDelete, plans.DeleteThenCreate:
h.ToRemoveAndAdd += 1
case plans.Create:
h.ToAdd += 1
case plans.Delete:
h.ToRemove += 1
case plans.Update:
h.ToChange += 1
}
return terraform.HookActionContinue, nil
}