101 lines
3.0 KiB
Go
101 lines
3.0 KiB
Go
package terraform
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import (
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"log"
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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/states"
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)
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// OrphanResourceInstanceTransformer is a GraphTransformer that adds orphaned
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// resource instances to the graph. An "orphan" is an instance that is present
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// in the state but belongs to a resource that is no longer present in the
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// configuration.
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//
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// This is not the transformer that deals with "count orphans" (instances that
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// are no longer covered by a resource's "count" or "for_each" setting); that's
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// handled instead by OrphanResourceCountTransformer.
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type OrphanResourceInstanceTransformer struct {
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Concrete ConcreteResourceInstanceNodeFunc
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// State is the global state. We require the global state to
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// properly find module orphans at our path.
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State *states.State
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// Config is the root node in the configuration tree. We'll look up
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// the appropriate note in this tree using the path in each node.
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Config *configs.Config
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}
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func (t *OrphanResourceInstanceTransformer) Transform(g *Graph) error {
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if t.State == nil {
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// If the entire state is nil, there can't be any orphans
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return nil
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}
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if t.Config == nil {
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// Should never happen: we can't be doing any Terraform operations
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// without at least an empty configuration.
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panic("OrphanResourceInstanceTransformer used without setting Config")
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}
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// Go through the modules and for each module transform in order
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// to add the orphan.
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for _, ms := range t.State.Modules {
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if err := t.transform(g, ms); err != nil {
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return err
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}
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}
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return nil
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}
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func (t *OrphanResourceInstanceTransformer) transform(g *Graph, ms *states.Module) error {
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if ms == nil {
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return nil
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}
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moduleAddr := ms.Addr
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// Get the configuration for this module. The configuration might be
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// nil if the module was removed from the configuration. This is okay,
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// this just means that every resource is an orphan.
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var m *configs.Module
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if c := t.Config.DescendentForInstance(moduleAddr); c != nil {
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m = c.Module
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}
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// An "orphan" is a resource that is in the state but not the configuration,
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// so we'll walk the state resources and try to correlate each of them
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// with a configuration block. Each orphan gets a node in the graph whose
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// type is decided by t.Concrete.
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//
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// We don't handle orphans related to changes in the "count" and "for_each"
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// pseudo-arguments here. They are handled by OrphanResourceCountTransformer.
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for _, rs := range ms.Resources {
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if m != nil {
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if r := m.ResourceByAddr(rs.Addr.Resource); r != nil {
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continue
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}
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}
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for key, inst := range rs.Instances {
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// deposed instances will be taken care of separately
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if inst.Current == nil {
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continue
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}
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addr := rs.Addr.Instance(key)
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abstract := NewNodeAbstractResourceInstance(addr)
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var node dag.Vertex = abstract
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if f := t.Concrete; f != nil {
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node = f(abstract)
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}
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log.Printf("[TRACE] OrphanResourceInstanceTransformer: adding single-instance orphan node for %s", addr)
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g.Add(node)
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}
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}
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return nil
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}
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