138 lines
3.7 KiB
Go
138 lines
3.7 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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// ApplyGraphBuilder implements GraphBuilder and is responsible for building
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// a graph for applying a Terraform diff.
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//
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// Because the graph is built from the diff (vs. the config or state),
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// this helps ensure that the apply-time graph doesn't modify any resources
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// that aren't explicitly in the diff. There are other scenarios where the
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// diff can be deviated, so this is just one layer of protection.
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type ApplyGraphBuilder 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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// Diff is the diff to apply.
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Diff *Diff
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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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// Provisioners is the list of provisioners supported.
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Provisioners []string
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// Targets are resources to target. This is only required to make sure
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// unnecessary outputs aren't included in the apply graph. The plan
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// builder successfully handles targeting resources. In the future,
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// outputs should go into the diff so that this is unnecessary.
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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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// Destroy, if true, represents a pure destroy operation
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Destroy bool
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// Validate will do structural validation of the graph.
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Validate bool
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}
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// See GraphBuilder
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func (b *ApplyGraphBuilder) Build(path []string) (*Graph, error) {
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return (&BasicGraphBuilder{
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Steps: b.Steps(),
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Validate: b.Validate,
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Name: "ApplyGraphBuilder",
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}).Build(path)
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}
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// See GraphBuilder
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func (b *ApplyGraphBuilder) Steps() []GraphTransformer {
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// Custom factory for creating providers.
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concreteProvider := func(a *NodeAbstractProvider) dag.Vertex {
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return &NodeApplyableProvider{
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NodeAbstractProvider: a,
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}
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}
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concreteResource := func(a *NodeAbstractResource) dag.Vertex {
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return &NodeApplyableResource{
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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 nodes represented in the diff.
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&DiffTransformer{
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Concrete: concreteResource,
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Diff: b.Diff,
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Module: b.Module,
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State: b.State,
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},
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// Create orphan output nodes
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&OrphanOutputTransformer{Module: b.Module, State: b.State},
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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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// Create all the providers
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&MissingProviderTransformer{Providers: b.Providers, Concrete: concreteProvider},
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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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// Destruction ordering
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&DestroyEdgeTransformer{Module: b.Module, State: b.State},
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GraphTransformIf(
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func() bool { return !b.Destroy },
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&CBDEdgeTransformer{Module: b.Module, State: b.State},
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),
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// Provisioner-related transformations
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&MissingProvisionerTransformer{Provisioners: b.Provisioners},
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&ProvisionerTransformer{},
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// Add root variables
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&RootVariableTransformer{Module: b.Module},
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// Add the outputs
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&OutputTransformer{Module: b.Module},
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// Add module variables
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&ModuleVariableTransformer{Module: b.Module},
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// Connect references so ordering is correct
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&ReferenceTransformer{},
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// Add the node to fix the state count boundaries
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&CountBoundaryTransformer{},
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// Target
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&TargetsTransformer{Targets: b.Targets},
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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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