113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
package terraform
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import (
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"fmt"
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"github.com/hashicorp/terraform/internal/addrs"
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"github.com/hashicorp/terraform/internal/tfdiags"
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"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/terraform/internal/configs"
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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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// Any "variable" block present in any non-root module is included here, even
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// if a particular variable is not referenced from anywhere.
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//
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// The transform will produce errors if a call to a module does not conform
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// to the expected set of arguments, but this transformer is not in a good
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// position to return errors and so the validate walk should include specific
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// steps for validating module blocks, separate from this transform.
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type ModuleVariableTransformer struct {
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Config *configs.Config
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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.Config)
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}
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func (t *ModuleVariableTransformer) transform(g *Graph, parent, c *configs.Config) error {
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// We can have no variables if we have no configuration.
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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 first.
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for _, cc := range c.Children {
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if err := t.transform(g, c, cc); err != nil {
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return err
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}
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}
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// If we're processing anything other than the root module then we'll
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// add graph nodes for variables defined inside. (Variables for the root
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// module are dealt with in RootVariableTransformer).
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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, c); 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, c *configs.Config) error {
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_, call := c.Path.Call()
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// Find the call in the parent module configuration, so we can get the
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// expressions given for each input variable at the call site.
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callConfig, exists := parent.Module.ModuleCalls[call.Name]
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if !exists {
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// This should never happen, since it indicates an improperly-constructed
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// configuration tree.
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panic(fmt.Errorf("no module call block found for %s", c.Path))
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}
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// We need to construct a schema for the expected call arguments based on
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// the configured variables in our config, which we can then use to
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// decode the content of the call block.
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schema := &hcl.BodySchema{}
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for _, v := range c.Module.Variables {
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schema.Attributes = append(schema.Attributes, hcl.AttributeSchema{
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Name: v.Name,
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Required: v.Default == cty.NilVal,
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})
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}
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content, contentDiags := callConfig.Config.Content(schema)
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if contentDiags.HasErrors() {
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// Validation code elsewhere should deal with any errors before we
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// get in here, but we'll report them out here just in case, to
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// avoid crashes.
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var diags tfdiags.Diagnostics
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diags = diags.Append(contentDiags)
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return diags.Err()
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}
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for _, v := range c.Module.Variables {
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var expr hcl.Expression
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if attr := content.Attributes[v.Name]; attr != nil {
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expr = attr.Expr
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}
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// Add a plannable node, as the variable may expand
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// during module expansion
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node := &nodeExpandModuleVariable{
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Addr: addrs.InputVariable{
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Name: v.Name,
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},
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Module: c.Path,
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Config: v,
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Expr: expr,
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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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