41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
package objchange
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import (
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"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/terraform/plans"
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)
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// ActionForChange determines which plans.Action value best describes a
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// change from the value given in before to the value given in after.
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//
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// Because it has no context aside from the values, it can only return the
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// basic actions NoOp, Create, Update, and Delete. Other codepaths with
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// additional information might make this decision differently, such as by
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// using the Replace action instead of the Update action where that makes
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// sense.
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//
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// If the after value is unknown then the action can't be properly decided, and
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// so ActionForChange will conservatively return either Create or Update
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// depending on whether the before value is null. The before value must always
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// be fully known; ActionForChange will panic if it contains any unknown values.
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func ActionForChange(before, after cty.Value) plans.Action {
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switch {
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case !after.IsKnown():
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if before.IsNull() {
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return plans.Create
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}
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return plans.Update
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case after.IsNull() && before.IsNull():
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return plans.NoOp
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case after.IsNull() && !before.IsNull():
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return plans.Delete
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case before.IsNull() && !after.IsNull():
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return plans.Create
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case after.RawEquals(before):
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return plans.NoOp
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default:
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return plans.Update
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}
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}
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