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36d0a50427
This is part of a general effort to move all of Terraform's non-library package surface under internal in order to reinforce that these are for internal use within Terraform only. If you were previously importing packages under this prefix into an external codebase, you could pin to an earlier release tag as an interim solution until you've make a plan to achieve the same functionality some other way.
56 lines
1.8 KiB
Go
56 lines
1.8 KiB
Go
package terraform
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import (
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"log"
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"github.com/hashicorp/terraform/internal/addrs"
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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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// OrphanResourceInstanceCountTransformer is a GraphTransformer that adds orphans
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// for an expanded count to the graph. The determination of this depends
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// on the count argument given.
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//
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// Orphans are found by comparing the count to what is found in the state.
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// This transform assumes that if an element in the state is within the count
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// bounds given, that it is not an orphan.
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type OrphanResourceInstanceCountTransformer struct {
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Concrete ConcreteResourceInstanceNodeFunc
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Addr addrs.AbsResource // Addr of the resource to look for orphans
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InstanceAddrs []addrs.AbsResourceInstance // Addresses that currently exist in config
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State *states.State // Full global state
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}
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func (t *OrphanResourceInstanceCountTransformer) Transform(g *Graph) error {
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rs := t.State.Resource(t.Addr)
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if rs == nil {
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return nil // Resource doesn't exist in state, so nothing to do!
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}
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// This is an O(n*m) analysis, which we accept for now because the
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// number of instances of a single resource ought to always be small in any
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// reasonable Terraform configuration.
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Have:
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for key := range rs.Instances {
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thisAddr := rs.Addr.Instance(key)
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for _, wantAddr := range t.InstanceAddrs {
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if wantAddr.Equal(thisAddr) {
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continue Have
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}
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}
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// If thisAddr is not in t.InstanceAddrs then we've found an "orphan"
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abstract := NewNodeAbstractResourceInstance(thisAddr)
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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] OrphanResourceInstanceCountTransformer: adding %s as %T", thisAddr, node)
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g.Add(node)
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}
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return nil
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}
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