opentofu/internal/terraform/graph_builder_apply.go
James Bardin 0bc69d64ec always validate all graphs
Complete the removal of the Validate option for graph building. There is
no case where we want to allow an invalid graph, as the primary reason
for validation is to ensure we have no cycles, and we can't walk a graph
with cycles. The only code which specifically relied on there being no
validation was a test to ensure the Validate flag prevented it.
2022-03-11 10:20:50 -05:00

169 lines
5.5 KiB
Go

package terraform
import (
"github.com/hashicorp/terraform/internal/addrs"
"github.com/hashicorp/terraform/internal/configs"
"github.com/hashicorp/terraform/internal/dag"
"github.com/hashicorp/terraform/internal/plans"
"github.com/hashicorp/terraform/internal/states"
"github.com/hashicorp/terraform/internal/tfdiags"
)
// ApplyGraphBuilder implements GraphBuilder and is responsible for building
// a graph for applying a Terraform diff.
//
// Because the graph is built from the diff (vs. the config or state),
// this helps ensure that the apply-time graph doesn't modify any resources
// that aren't explicitly in the diff. There are other scenarios where the
// diff can be deviated, so this is just one layer of protection.
type ApplyGraphBuilder struct {
// Config is the configuration tree that the diff was built from.
Config *configs.Config
// Changes describes the changes that we need apply.
Changes *plans.Changes
// State is the current state
State *states.State
// RootVariableValues are the root module input variables captured as
// part of the plan object, which we must reproduce in the apply step
// to get a consistent result.
RootVariableValues InputValues
// Plugins is a library of the plug-in components (providers and
// provisioners) available for use.
Plugins *contextPlugins
// Targets are resources to target. This is only required to make sure
// unnecessary outputs aren't included in the apply graph. The plan
// builder successfully handles targeting resources. In the future,
// outputs should go into the diff so that this is unnecessary.
Targets []addrs.Targetable
// ForceReplace are the resource instance addresses that the user
// requested to force replacement for when creating the plan, if any.
// The apply step refers to these as part of verifying that the planned
// actions remain consistent between plan and apply.
ForceReplace []addrs.AbsResourceInstance
}
// See GraphBuilder
func (b *ApplyGraphBuilder) Build(path addrs.ModuleInstance) (*Graph, tfdiags.Diagnostics) {
return (&BasicGraphBuilder{
Steps: b.Steps(),
Name: "ApplyGraphBuilder",
}).Build(path)
}
// See GraphBuilder
func (b *ApplyGraphBuilder) Steps() []GraphTransformer {
// Custom factory for creating providers.
concreteProvider := func(a *NodeAbstractProvider) dag.Vertex {
return &NodeApplyableProvider{
NodeAbstractProvider: a,
}
}
concreteResource := func(a *NodeAbstractResource) dag.Vertex {
return &nodeExpandApplyableResource{
NodeAbstractResource: a,
}
}
concreteResourceInstance := func(a *NodeAbstractResourceInstance) dag.Vertex {
return &NodeApplyableResourceInstance{
NodeAbstractResourceInstance: a,
forceReplace: b.ForceReplace,
}
}
steps := []GraphTransformer{
// Creates all the resources represented in the config. During apply,
// we use this just to ensure that the whole-resource metadata is
// updated to reflect things such as whether the count argument is
// set in config, or which provider configuration manages each resource.
&ConfigTransformer{
Concrete: concreteResource,
Config: b.Config,
},
// Add dynamic values
&RootVariableTransformer{Config: b.Config, RawValues: b.RootVariableValues},
&ModuleVariableTransformer{Config: b.Config},
&LocalTransformer{Config: b.Config},
&OutputTransformer{Config: b.Config, Changes: b.Changes},
// Creates all the resource instances represented in the diff, along
// with dependency edges against the whole-resource nodes added by
// ConfigTransformer above.
&DiffTransformer{
Concrete: concreteResourceInstance,
State: b.State,
Changes: b.Changes,
},
// Attach the state
&AttachStateTransformer{State: b.State},
// Create orphan output nodes
&OrphanOutputTransformer{Config: b.Config, State: b.State},
// Attach the configuration to any resources
&AttachResourceConfigTransformer{Config: b.Config},
// add providers
transformProviders(concreteProvider, b.Config),
// Remove modules no longer present in the config
&RemovedModuleTransformer{Config: b.Config, State: b.State},
// Must attach schemas before ReferenceTransformer so that we can
// analyze the configuration to find references.
&AttachSchemaTransformer{Plugins: b.Plugins, Config: b.Config},
// Create expansion nodes for all of the module calls. This must
// come after all other transformers that create nodes representing
// objects that can belong to modules.
&ModuleExpansionTransformer{Config: b.Config},
// Connect references so ordering is correct
&ReferenceTransformer{},
&AttachDependenciesTransformer{},
// Detect when create_before_destroy must be forced on for a particular
// node due to dependency edges, to avoid graph cycles during apply.
&ForcedCBDTransformer{},
// Destruction ordering
&DestroyEdgeTransformer{
Config: b.Config,
State: b.State,
},
&CBDEdgeTransformer{
Config: b.Config,
State: b.State,
},
// We need to remove configuration nodes that are not used at all, as
// they may not be able to evaluate, especially during destroy.
// These include variables, locals, and instance expanders.
&pruneUnusedNodesTransformer{},
// Target
&TargetsTransformer{Targets: b.Targets},
// Close opened plugin connections
&CloseProviderTransformer{},
// close the root module
&CloseRootModuleTransformer{},
// Perform the transitive reduction to make our graph a bit
// more understandable if possible (it usually is possible).
&TransitiveReductionTransformer{},
}
return steps
}