75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
package terraform
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import (
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"fmt"
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"github.com/hashicorp/terraform/config"
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)
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// EvalValidateResourceSelfRef is an EvalNode implementation that validates that
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// a configuration doesn't contain a reference to the resource itself.
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//
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// This must be done prior to interpolating configuration in order to avoid
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// any infinite loop scenarios.
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type EvalValidateResourceSelfRef struct {
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Addr **ResourceAddress
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Config **config.RawConfig
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}
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func (n *EvalValidateResourceSelfRef) Eval(ctx EvalContext) (interface{}, error) {
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addr := *n.Addr
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conf := *n.Config
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// Go through the variables and find self references
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var errs []error
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for k, raw := range conf.Variables {
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rv, ok := raw.(*config.ResourceVariable)
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if !ok {
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continue
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}
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// Build an address from the variable
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varAddr := &ResourceAddress{
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Path: addr.Path,
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Mode: rv.Mode,
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Type: rv.Type,
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Name: rv.Name,
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Index: rv.Index,
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InstanceType: TypePrimary,
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}
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// If the variable access is a multi-access (*), then we just
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// match the index so that we'll match our own addr if everything
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// else matches.
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if rv.Multi && rv.Index == -1 {
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varAddr.Index = addr.Index
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}
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// This is a weird thing where ResourceAddres has index "-1" when
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// index isn't set at all. This means index "0" for resource access.
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// So, if we have this scenario, just set our varAddr to -1 so it
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// matches.
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if addr.Index == -1 && varAddr.Index == 0 {
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varAddr.Index = -1
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}
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// If the addresses match, then this is a self reference
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if varAddr.Equals(addr) && varAddr.Index == addr.Index {
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errs = append(errs, fmt.Errorf(
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"%s: self reference not allowed: %q",
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addr, k))
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}
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}
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// If no errors, no errors!
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if len(errs) == 0 {
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return nil, nil
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}
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// Wrap the errors in the proper wrapper so we can handle validation
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// formatting properly upstream.
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return nil, &EvalValidateError{
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Errors: errs,
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}
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}
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