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This is part of a general effort to move all of Terraform's non-library package surface under internal in order to reinforce that these are for internal use within Terraform only. If you were previously importing packages under this prefix into an external codebase, you could pin to an earlier release tag as an interim solution until you've make a plan to achieve the same functionality some other way.
53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
package terraform
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import (
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"log"
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"github.com/hashicorp/terraform/internal/dag"
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"github.com/hashicorp/terraform/internal/logging"
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)
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// GraphTransformer is the interface that transformers implement. This
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// interface is only for transforms that need entire graph visibility.
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type GraphTransformer interface {
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Transform(*Graph) error
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}
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// GraphVertexTransformer is an interface that transforms a single
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// Vertex within with graph. This is a specialization of GraphTransformer
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// that makes it easy to do vertex replacement.
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//
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// The GraphTransformer that runs through the GraphVertexTransformers is
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// VertexTransformer.
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type GraphVertexTransformer interface {
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Transform(dag.Vertex) (dag.Vertex, error)
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}
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type graphTransformerMulti struct {
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Transforms []GraphTransformer
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}
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func (t *graphTransformerMulti) Transform(g *Graph) error {
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var lastStepStr string
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for _, t := range t.Transforms {
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log.Printf("[TRACE] (graphTransformerMulti) Executing graph transform %T", t)
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if err := t.Transform(g); err != nil {
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return err
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}
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if thisStepStr := g.StringWithNodeTypes(); thisStepStr != lastStepStr {
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log.Printf("[TRACE] (graphTransformerMulti) Completed graph transform %T with new graph:\n%s ------", t, logging.Indent(thisStepStr))
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lastStepStr = thisStepStr
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} else {
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log.Printf("[TRACE] (graphTransformerMulti) Completed graph transform %T (no changes)", t)
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}
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}
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return nil
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}
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// GraphTransformMulti combines multiple graph transformers into a single
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// GraphTransformer that runs all the individual graph transformers.
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func GraphTransformMulti(ts ...GraphTransformer) GraphTransformer {
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return &graphTransformerMulti{Transforms: ts}
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}
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