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change.go
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change.go
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package json
import (
"fmt"
"github.com/hashicorp/terraform/internal/plans"
)
func NewResourceInstanceChange(change *plans.ResourceInstanceChangeSrc) *ResourceInstanceChange {
c := &ResourceInstanceChange{
Resource: newResourceAddr(change.Addr),
Action: changeAction(change.Action),
Reason: changeReason(change.ActionReason),
}
if !change.Addr.Equal(change.PrevRunAddr) {
if c.Action == ActionNoOp {
c.Action = ActionMove
}
pr := newResourceAddr(change.PrevRunAddr)
c.PreviousResource = &pr
}
return c
}
type ResourceInstanceChange struct {
Resource ResourceAddr `json:"resource"`
PreviousResource *ResourceAddr `json:"previous_resource,omitempty"`
Action ChangeAction `json:"action"`
Reason ChangeReason `json:"reason,omitempty"`
}
func (c *ResourceInstanceChange) String() string {
return fmt.Sprintf("%s: Plan to %s", c.Resource.Addr, c.Action)
}
type ChangeAction string
const (
ActionNoOp ChangeAction = "noop"
ActionMove ChangeAction = "move"
ActionCreate ChangeAction = "create"
ActionRead ChangeAction = "read"
ActionUpdate ChangeAction = "update"
ActionReplace ChangeAction = "replace"
ActionDelete ChangeAction = "delete"
)
func changeAction(action plans.Action) ChangeAction {
switch action {
case plans.NoOp:
return ActionNoOp
case plans.Create:
return ActionCreate
case plans.Read:
return ActionRead
case plans.Update:
return ActionUpdate
case plans.DeleteThenCreate, plans.CreateThenDelete:
return ActionReplace
case plans.Delete:
return ActionDelete
default:
return ActionNoOp
}
}
type ChangeReason string
const (
ReasonNone ChangeReason = ""
ReasonTainted ChangeReason = "tainted"
ReasonRequested ChangeReason = "requested"
ReasonCannotUpdate ChangeReason = "cannot_update"
ReasonUnknown ChangeReason = "unknown"
)
func changeReason(reason plans.ResourceInstanceChangeActionReason) ChangeReason {
switch reason {
case plans.ResourceInstanceChangeNoReason:
return ReasonNone
case plans.ResourceInstanceReplaceBecauseTainted:
return ReasonTainted
case plans.ResourceInstanceReplaceByRequest:
return ReasonRequested
case plans.ResourceInstanceReplaceBecauseCannotUpdate:
return ReasonCannotUpdate
default:
// This should never happen, but there's no good way to guarantee
// exhaustive handling of the enum, so a generic fall back is better
// than a misleading result or a panic
return ReasonUnknown
}
}