126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
package terraform
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import (
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"github.com/hashicorp/terraform/config/module"
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"github.com/hashicorp/terraform/dag"
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)
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// PlanGraphBuilder implements GraphBuilder and is responsible for building
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// a graph for planning (creating a Terraform Diff).
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//
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// The primary difference between this graph and others:
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//
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// * Based on the config since it represents the target state
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//
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// * Ignores lifecycle options since no lifecycle events occur here. This
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// simplifies the graph significantly since complex transforms such as
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// create-before-destroy can be completely ignored.
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//
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type PlanGraphBuilder struct {
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// Module is the root module for the graph to build.
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Module *module.Tree
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// State is the current state
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State *State
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// Providers is the list of providers supported.
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Providers []string
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// Targets are resources to target
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Targets []string
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// DisableReduce, if true, will not reduce the graph. Great for testing.
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DisableReduce bool
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}
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// See GraphBuilder
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func (b *PlanGraphBuilder) Build(path []string) (*Graph, error) {
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return (&BasicGraphBuilder{
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Steps: b.Steps(),
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Validate: true,
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Name: "PlanGraphBuilder",
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}).Build(path)
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}
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// See GraphBuilder
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func (b *PlanGraphBuilder) Steps() []GraphTransformer {
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// Custom factory for creating providers.
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providerFactory := func(name string, path []string) GraphNodeProvider {
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return &NodeApplyableProvider{
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NameValue: name,
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PathValue: path,
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}
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}
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concreteResource := func(a *NodeAbstractResource) dag.Vertex {
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return &NodePlannableResource{
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NodeAbstractResource: a,
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}
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}
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concreteResourceOrphan := func(a *NodeAbstractResource) dag.Vertex {
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return &NodePlannableResourceOrphan{
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NodeAbstractResource: a,
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}
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}
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steps := []GraphTransformer{
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// Creates all the resources represented in the config
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&ConfigTransformer{
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Concrete: concreteResource,
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Module: b.Module,
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},
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// Add the outputs
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&OutputTransformer{Module: b.Module},
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// Add orphan resources
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&OrphanResourceTransformer{
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Concrete: concreteResourceOrphan,
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State: b.State,
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Module: b.Module,
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},
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// Attach the configuration to any resources
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&AttachResourceConfigTransformer{Module: b.Module},
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// Attach the state
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&AttachStateTransformer{State: b.State},
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// Connect so that the references are ready for targeting. We'll
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// have to connect again later for providers and so on.
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&ReferenceTransformer{},
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// Target
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&TargetsTransformer{Targets: b.Targets},
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// Create all the providers
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&MissingProviderTransformer{Providers: b.Providers, Factory: providerFactory},
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&ProviderTransformer{},
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&DisableProviderTransformer{},
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&ParentProviderTransformer{},
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&AttachProviderConfigTransformer{Module: b.Module},
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// Add root variables
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&RootVariableTransformer{Module: b.Module},
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// Add module variables
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&ModuleVariableTransformer{Module: b.Module},
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// Connect references again to connect the providers, module variables,
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// etc. This is idempotent.
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&ReferenceTransformer{},
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// Single root
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&RootTransformer{},
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}
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if !b.DisableReduce {
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// Perform the transitive reduction to make our graph a bit
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// more sane if possible (it usually is possible).
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steps = append(steps, &TransitiveReductionTransformer{})
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}
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return steps
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}
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