121 lines
3.2 KiB
Go
121 lines
3.2 KiB
Go
package terraform
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import (
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"log"
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"github.com/hashicorp/terraform/config"
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"github.com/hashicorp/terraform/config/module"
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"github.com/hashicorp/terraform/dag"
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)
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// ModuleVariableTransformer is a GraphTransformer that adds all the variables
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// in the configuration to the graph.
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//
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// This only adds variables that are referenced by other things in the graph.
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// If a module variable is not referenced, it won't be added to the graph.
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type ModuleVariableTransformer struct {
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Module *module.Tree
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DisablePrune bool // True if pruning unreferenced should be disabled
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}
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func (t *ModuleVariableTransformer) Transform(g *Graph) error {
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return t.transform(g, nil, t.Module)
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}
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func (t *ModuleVariableTransformer) transform(g *Graph, parent, m *module.Tree) error {
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// If no config, no variables
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if m == nil {
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return nil
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}
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// Transform all the children. This must be done BEFORE the transform
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// above since child module variables can reference parent module variables.
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for _, c := range m.Children() {
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if err := t.transform(g, m, c); err != nil {
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return err
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}
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}
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// If we have a parent, we can determine if a module variable is being
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// used, so we transform this.
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if parent != nil {
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if err := t.transformSingle(g, parent, m); 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 *ModuleVariableTransformer) transformSingle(g *Graph, parent, m *module.Tree) error {
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// If we have no vars, we're done!
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vars := m.Config().Variables
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if len(vars) == 0 {
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log.Printf("[TRACE] Module %#v has no variables, skipping.", m.Path())
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return nil
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}
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// Look for usage of this module
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var mod *config.Module
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for _, modUse := range parent.Config().Modules {
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if modUse.Name == m.Name() {
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mod = modUse
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break
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}
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}
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if mod == nil {
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log.Printf("[INFO] Module %#v not used, not adding variables", m.Path())
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return nil
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}
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// Build the reference map so we can determine if we're referencing things.
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refMap := NewReferenceMap(g.Vertices())
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// Add all variables here
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for _, v := range vars {
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// Determine the value of the variable. If it isn't in the
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// configuration then it was never set and that's not a problem.
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var value *config.RawConfig
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if raw, ok := mod.RawConfig.Raw[v.Name]; ok {
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var err error
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value, err = config.NewRawConfig(map[string]interface{}{
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v.Name: raw,
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})
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if err != nil {
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// This shouldn't happen because it is already in
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// a RawConfig above meaning it worked once before.
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panic(err)
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}
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}
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// Build the node.
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//
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// NOTE: For now this is just an "applyable" variable. As we build
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// new graph builders for the other operations I suspect we'll
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// find a way to parameterize this, require new transforms, etc.
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node := &NodeApplyableModuleVariable{
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PathValue: normalizeModulePath(m.Path()),
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Config: v,
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Value: value,
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Module: t.Module,
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}
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if !t.DisablePrune {
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// If the node is not referenced by anything, then we don't need
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// to include it since it won't be used.
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if matches := refMap.ReferencedBy(node); len(matches) == 0 {
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log.Printf(
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"[INFO] Not including %q in graph, nothing depends on it",
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dag.VertexName(node))
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continue
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}
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}
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// Add it!
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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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