85 lines
2.0 KiB
Go
85 lines
2.0 KiB
Go
package diff
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import (
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"github.com/hashicorp/terraform/terraform"
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)
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// ResourceBuilder is a helper that can knows about how a single resource
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// changes and how those changes affect the diff.
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type ResourceBuilder struct {
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CreateComputedAttrs []string
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RequiresNewAttrs []string
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}
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// Diff returns the ResourceDiff for a resource given its state and
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// configuration.
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func (b *ResourceBuilder) Diff(
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s *terraform.ResourceState,
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c *terraform.ResourceConfig) (*terraform.ResourceDiff, error) {
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attrs := make(map[string]*terraform.ResourceAttrDiff)
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requiresNewSet := make(map[string]struct{})
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for _, k := range b.RequiresNewAttrs {
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requiresNewSet[k] = struct{}{}
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}
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// We require a new resource if the ID is empty. Or, later, we set
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// this to true if any configuration changed that triggers a new resource.
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requiresNew := s.ID == ""
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// Go through the configuration and find the changed attributes
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for k, v := range c.Raw {
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newV := v.(string)
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var oldV string
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var ok bool
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if oldV, ok = s.Attributes[k]; ok {
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// Old value exists! We check to see if there is a change
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if oldV == newV {
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continue
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}
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}
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// There has been a change. Record it
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attrs[k] = &terraform.ResourceAttrDiff{
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Old: oldV,
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New: newV,
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}
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// If this requires a new resource, record that and flag our
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// boolean.
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if _, ok := requiresNewSet[k]; ok {
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attrs[k].RequiresNew = true
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requiresNew = true
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}
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}
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// If we require a new resource, then process all the attributes
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// that will be changing due to the creation of the resource.
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if requiresNew {
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attrs["id"] = &terraform.ResourceAttrDiff{
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Old: s.ID,
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NewComputed: true,
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RequiresNew: true,
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}
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for _, k := range b.CreateComputedAttrs {
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old := s.Attributes[k]
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attrs[k] = &terraform.ResourceAttrDiff{
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Old: old,
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NewComputed: true,
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}
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}
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}
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// Build our resulting diff if we had attributes change
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var result *terraform.ResourceDiff
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if len(attrs) > 0 {
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result = &terraform.ResourceDiff{
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Attributes: attrs,
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}
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}
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return result, nil
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}
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