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c937c06a03
Due to how deeply the configuration types go into Terraform Core, there isn't a great way to switch out to HCL2 gradually. As a consequence, this huge commit gets us from the old state to a _compilable_ new state, but does not yet attempt to fix any tests and has a number of known missing parts and bugs. We will continue to iterate on this in forthcoming commits, heading back towards passing tests and making Terraform fully-functional again. The three main goals here are: - Use the configuration models from the "configs" package instead of the older models in the "config" package, which is now deprecated and preserved only to help us write our migration tool. - Do expression inspection and evaluation using the functionality of the new "lang" package, instead of the Interpolator type and related functionality in the main "terraform" package. - Represent addresses of various objects using types in the addrs package, rather than hand-constructed strings. This is not critical to support the above, but was a big help during the implementation of these other points since it made it much more explicit what kind of address is expected in each context. Since our new packages are built to accommodate some future planned features that are not yet implemented (e.g. the "for_each" argument on resources, "count"/"for_each" on modules), and since there's still a fair amount of functionality still using old-style APIs, there is a moderate amount of shimming here to connect new assumptions with old, hopefully in a way that makes it easier to find and eliminate these shims later. I apologize in advance to the person who inevitably just found this huge commit while spelunking through the commit history.
96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package terraform
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import (
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"log"
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"github.com/hashicorp/terraform/configs"
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"github.com/hashicorp/terraform/dag"
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)
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// OutputTransformer is a GraphTransformer that adds all the outputs
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// in the configuration to the graph.
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//
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// This is done for the apply graph builder even if dependent nodes
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// aren't changing since there is no downside: the state will be available
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// even if the dependent items aren't changing.
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type OutputTransformer struct {
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Config *configs.Config
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}
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func (t *OutputTransformer) Transform(g *Graph) error {
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return t.transform(g, t.Config)
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}
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func (t *OutputTransformer) transform(g *Graph, c *configs.Config) error {
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// If we have no config then there can be no outputs.
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if c == nil {
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return nil
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}
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// Transform all the children. We must do this first because
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// we can reference module outputs and they must show up in the
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// reference map.
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for _, cc := range c.Children {
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if err := t.transform(g, cc); err != nil {
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return err
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}
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}
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// Our addressing system distinguishes between modules and module instances,
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// but we're not yet ready to make that distinction here (since we don't
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// support "count"/"for_each" on modules) and so we just do a naive
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// transform of the module path into a module instance path, assuming that
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// no keys are in use. This should be removed when "count" and "for_each"
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// are implemented for modules.
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path := c.Path.UnkeyedInstanceShim()
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for _, o := range c.Module.Outputs {
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addr := path.OutputValue(o.Name)
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node := &NodeApplyableOutput{
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Addr: addr,
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Config: o,
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}
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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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// DestroyOutputTransformer is a GraphTransformer that adds nodes to delete
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// outputs during destroy. We need to do this to ensure that no stale outputs
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// are ever left in the state.
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type DestroyOutputTransformer struct {
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}
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func (t *DestroyOutputTransformer) Transform(g *Graph) error {
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for _, v := range g.Vertices() {
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output, ok := v.(*NodeApplyableOutput)
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if !ok {
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continue
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}
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// create the destroy node for this output
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node := &NodeDestroyableOutput{
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Addr: output.Addr,
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Config: output.Config,
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}
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log.Printf("[TRACE] creating %s", node.Name())
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g.Add(node)
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deps, err := g.Descendents(v)
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if err != nil {
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return err
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}
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// the destroy node must depend on the eval node
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deps.Add(v)
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for _, d := range deps.List() {
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log.Printf("[TRACE] %s depends on %s", node.Name(), dag.VertexName(d))
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g.Connect(dag.BasicEdge(node, d))
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}
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}
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return nil
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}
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