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node_resource_plan.go
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node_resource_plan.go
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package terraform
import (
"log"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/dag"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/terraform/tfdiags"
)
// nodeExpandPlannableResource handles the first layer of resource
// expansion. We need this extra layer so DynamicExpand is called twice for
// the resource, the first to expand the Resource for each module instance, and
// the second to expand each ResourceInstance for the expanded Resources.
type nodeExpandPlannableResource struct {
*NodeAbstractResource
// ForceCreateBeforeDestroy might be set via our GraphNodeDestroyerCBD
// during graph construction, if dependencies require us to force this
// on regardless of what the configuration says.
ForceCreateBeforeDestroy *bool
// skipRefresh indicates that we should skip refreshing individual instances
skipRefresh bool
// We attach dependencies to the Resource during refresh, since the
// instances are instantiated during DynamicExpand.
dependencies []addrs.ConfigResource
}
var (
_ GraphNodeDestroyerCBD = (*nodeExpandPlannableResource)(nil)
_ GraphNodeDynamicExpandable = (*nodeExpandPlannableResource)(nil)
_ GraphNodeReferenceable = (*nodeExpandPlannableResource)(nil)
_ GraphNodeReferencer = (*nodeExpandPlannableResource)(nil)
_ GraphNodeConfigResource = (*nodeExpandPlannableResource)(nil)
_ GraphNodeAttachResourceConfig = (*nodeExpandPlannableResource)(nil)
_ GraphNodeAttachDependencies = (*nodeExpandPlannableResource)(nil)
_ GraphNodeTargetable = (*nodeExpandPlannableResource)(nil)
)
func (n *nodeExpandPlannableResource) Name() string {
return n.NodeAbstractResource.Name() " (expand)"
}
// GraphNodeAttachDependencies
func (n *nodeExpandPlannableResource) AttachDependencies(deps []addrs.ConfigResource) {
n.dependencies = deps
}
// GraphNodeDestroyerCBD
func (n *nodeExpandPlannableResource) CreateBeforeDestroy() bool {
if n.ForceCreateBeforeDestroy != nil {
return *n.ForceCreateBeforeDestroy
}
// If we have no config, we just assume no
if n.Config == nil || n.Config.Managed == nil {
return false
}
return n.Config.Managed.CreateBeforeDestroy
}
// GraphNodeDestroyerCBD
func (n *nodeExpandPlannableResource) ModifyCreateBeforeDestroy(v bool) error {
n.ForceCreateBeforeDestroy = &v
return nil
}
func (n *nodeExpandPlannableResource) DynamicExpand(ctx EvalContext) (*Graph, error) {
var g Graph
expander := ctx.InstanceExpander()
moduleInstances := expander.ExpandModule(n.Addr.Module)
// Add the current expanded resource to the graph
for _, module := range moduleInstances {
resAddr := n.Addr.Resource.Absolute(module)
g.Add(&NodePlannableResource{
NodeAbstractResource: n.NodeAbstractResource,
Addr: resAddr,
ForceCreateBeforeDestroy: n.ForceCreateBeforeDestroy,
dependencies: n.dependencies,
skipRefresh: n.skipRefresh,
})
}
// Lock the state while we inspect it
state := ctx.State().Lock()
defer ctx.State().Unlock()
var orphans []*states.Resource
for _, res := range state.Resources(n.Addr) {
found := false
for _, m := range moduleInstances {
if m.Equal(res.Addr.Module) {
found = true
break
}
}
// Address form state was not found in the current config
if !found {
orphans = append(orphans, res)
}
}
// The concrete resource factory we'll use for orphans
concreteResourceOrphan := func(a *NodeAbstractResourceInstance) *NodePlannableResourceInstanceOrphan {
// Add the config and state since we don't do that via transforms
a.Config = n.Config
a.ResolvedProvider = n.ResolvedProvider
a.Schema = n.Schema
a.ProvisionerSchemas = n.ProvisionerSchemas
a.ProviderMetas = n.ProviderMetas
a.Dependencies = n.dependencies
return &NodePlannableResourceInstanceOrphan{
NodeAbstractResourceInstance: a,
}
}
for _, res := range orphans {
for key := range res.Instances {
addr := res.Addr.Instance(key)
abs := NewNodeAbstractResourceInstance(addr)
abs.AttachResourceState(res)
n := concreteResourceOrphan(abs)
g.Add(n)
}
}
return &g, nil
}
// NodePlannableResource represents a resource that is "plannable":
// it is ready to be planned in order to create a diff.
type NodePlannableResource struct {
*NodeAbstractResource
Addr addrs.AbsResource
// ForceCreateBeforeDestroy might be set via our GraphNodeDestroyerCBD
// during graph construction, if dependencies require us to force this
// on regardless of what the configuration says.
ForceCreateBeforeDestroy *bool
// skipRefresh indicates that we should skip refreshing individual instances
skipRefresh bool
dependencies []addrs.ConfigResource
}
var (
_ GraphNodeModuleInstance = (*NodePlannableResource)(nil)
_ GraphNodeDestroyerCBD = (*NodePlannableResource)(nil)
_ GraphNodeDynamicExpandable = (*NodePlannableResource)(nil)
_ GraphNodeReferenceable = (*NodePlannableResource)(nil)
_ GraphNodeReferencer = (*NodePlannableResource)(nil)
_ GraphNodeConfigResource = (*NodePlannableResource)(nil)
_ GraphNodeAttachResourceConfig = (*NodePlannableResource)(nil)
)
func (n *NodePlannableResource) Path() addrs.ModuleInstance {
return n.Addr.Module
}
func (n *NodePlannableResource) Name() string {
return n.Addr.String()
}
// GraphNodeExecutable
func (n *NodePlannableResource) Execute(ctx EvalContext, op walkOperation) tfdiags.Diagnostics {
if n.Config == nil {
// Nothing to do, then.
log.Printf("[TRACE] NodeApplyableResource: no configuration present for %s", n.Name())
return nil
}
return n.writeResourceState(ctx, n.Addr)
}
// GraphNodeDestroyerCBD
func (n *NodePlannableResource) CreateBeforeDestroy() bool {
if n.ForceCreateBeforeDestroy != nil {
return *n.ForceCreateBeforeDestroy
}
// If we have no config, we just assume no
if n.Config == nil || n.Config.Managed == nil {
return false
}
return n.Config.Managed.CreateBeforeDestroy
}
// GraphNodeDestroyerCBD
func (n *NodePlannableResource) ModifyCreateBeforeDestroy(v bool) error {
n.ForceCreateBeforeDestroy = &v
return nil
}
// GraphNodeDynamicExpandable
func (n *NodePlannableResource) DynamicExpand(ctx EvalContext) (*Graph, error) {
var diags tfdiags.Diagnostics
// We need to potentially rename an instance address in the state
// if we're transitioning whether "count" is set at all.
fixResourceCountSetTransition(ctx, n.Addr.Config(), n.Config.Count != nil)
// Our instance expander should already have been informed about the
// expansion of this resource and of all of its containing modules, so
// it can tell us which instance addresses we need to process.
expander := ctx.InstanceExpander()
instanceAddrs := expander.ExpandResource(n.ResourceAddr().Absolute(ctx.Path()))
// Our graph transformers require access to the full state, so we'll
// temporarily lock it while we work on this.
state := ctx.State().Lock()
defer ctx.State().Unlock()
// The concrete resource factory we'll use
concreteResource := func(a *NodeAbstractResourceInstance) dag.Vertex {
// Add the config and state since we don't do that via transforms
a.Config = n.Config
a.ResolvedProvider = n.ResolvedProvider
a.Schema = n.Schema
a.ProvisionerSchemas = n.ProvisionerSchemas
a.ProviderMetas = n.ProviderMetas
a.dependsOn = n.dependsOn
a.Dependencies = n.dependencies
return &NodePlannableResourceInstance{
NodeAbstractResourceInstance: a,
// By the time we're walking, we've figured out whether we need
// to force on CreateBeforeDestroy due to dependencies on other
// nodes that have it.
ForceCreateBeforeDestroy: n.CreateBeforeDestroy(),
skipRefresh: n.skipRefresh,
}
}
// The concrete resource factory we'll use for orphans
concreteResourceOrphan := func(a *NodeAbstractResourceInstance) dag.Vertex {
// Add the config and state since we don't do that via transforms
a.Config = n.Config
a.ResolvedProvider = n.ResolvedProvider
a.Schema = n.Schema
a.ProvisionerSchemas = n.ProvisionerSchemas
a.ProviderMetas = n.ProviderMetas
return &NodePlannableResourceInstanceOrphan{
NodeAbstractResourceInstance: a,
}
}
// Start creating the steps
steps := []GraphTransformer{
// Expand the count or for_each (if present)
&ResourceCountTransformer{
Concrete: concreteResource,
Schema: n.Schema,
Addr: n.ResourceAddr(),
InstanceAddrs: instanceAddrs,
},
// Add the count/for_each orphans
&OrphanResourceInstanceCountTransformer{
Concrete: concreteResourceOrphan,
Addr: n.Addr,
InstanceAddrs: instanceAddrs,
State: state,
},
// Attach the state
&AttachStateTransformer{State: state},
// Targeting
&TargetsTransformer{Targets: n.Targets},
// Connect references so ordering is correct
&ReferenceTransformer{},
// Make sure there is a single root
&RootTransformer{},
}
// Build the graph
b := &BasicGraphBuilder{
Steps: steps,
Validate: true,
Name: "NodePlannableResource",
}
graph, diags := b.Build(ctx.Path())
return graph, diags.ErrWithWarnings()
}