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Previously the graph builders all expected to be given a full manifest of all of the plugin component schemas that they could need during their analysis work. That made sense when terraform.NewContext would always proactively load all of the schemas before doing any other work, but we now have a load-as-needed strategy for schemas. We'll now have the graph builders use the contextPlugins object they each already hold to retrieve individual schemas when needed. This avoids the need to prepare a redundant data structure to pass alongside the contextPlugins object, and leans on the memoization behavior inside contextPlugins to preserve the old behavior of loading each provider's schema only once.
98 lines
3.0 KiB
Go
98 lines
3.0 KiB
Go
package terraform
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import (
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"github.com/hashicorp/terraform/internal/addrs"
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"github.com/hashicorp/terraform/internal/configs"
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"github.com/hashicorp/terraform/internal/dag"
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"github.com/hashicorp/terraform/internal/tfdiags"
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)
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// ImportGraphBuilder implements GraphBuilder and is responsible for building
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// a graph for importing resources into Terraform. This is a much, much
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// simpler graph than a normal configuration graph.
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type ImportGraphBuilder struct {
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// ImportTargets are the list of resources to import.
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ImportTargets []*ImportTarget
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// Module is a configuration to build the graph from. See ImportOpts.Config.
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Config *configs.Config
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// Plugins is a library of plug-in components (providers and
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// provisioners) available for use.
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Plugins *contextPlugins
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}
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// Build builds the graph according to the steps returned by Steps.
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func (b *ImportGraphBuilder) Build(path addrs.ModuleInstance) (*Graph, tfdiags.Diagnostics) {
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return (&BasicGraphBuilder{
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Steps: b.Steps(),
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Validate: true,
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Name: "ImportGraphBuilder",
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}).Build(path)
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}
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// Steps returns the ordered list of GraphTransformers that must be executed
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// to build a complete graph.
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func (b *ImportGraphBuilder) Steps() []GraphTransformer {
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// Get the module. If we don't have one, we just use an empty tree
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// so that the transform still works but does nothing.
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config := b.Config
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if config == nil {
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config = configs.NewEmptyConfig()
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}
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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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steps := []GraphTransformer{
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// Create all our resources from the configuration and state
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&ConfigTransformer{Config: config},
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// Add dynamic values
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&RootVariableTransformer{Config: b.Config},
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&ModuleVariableTransformer{Config: b.Config},
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&LocalTransformer{Config: b.Config},
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&OutputTransformer{Config: b.Config},
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// Attach the configuration to any resources
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&AttachResourceConfigTransformer{Config: b.Config},
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// Add the import steps
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&ImportStateTransformer{Targets: b.ImportTargets, Config: b.Config},
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transformProviders(concreteProvider, config),
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// Must attach schemas before ReferenceTransformer so that we can
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// analyze the configuration to find references.
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&AttachSchemaTransformer{Plugins: b.Plugins, Config: b.Config},
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// Create expansion nodes for all of the module calls. This must
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// come after all other transformers that create nodes representing
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// objects that can belong to modules.
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&ModuleExpansionTransformer{Config: b.Config},
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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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// Make sure data sources are aware of any depends_on from the
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// configuration
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&attachDataResourceDependsOnTransformer{},
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// Close opened plugin connections
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&CloseProviderTransformer{},
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// Close root module
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&CloseRootModuleTransformer{},
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// Optimize
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&TransitiveReductionTransformer{},
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}
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return steps
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}
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