generate precise resource types during validate
Allow `GetResource` to return correct types values during validation, rather than relying on `cty.DynamicVal` as a placeholder. This allows other dependent expressions to be more correctly evaluated.
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@ -5308,6 +5308,7 @@ func TestContext2Plan_selfRefMultiAll(t *testing.T) {
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ResourceTypes: map[string]*configschema.Block{
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"aws_instance": {
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Attributes: map[string]*configschema.Attribute{
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"id": {Type: cty.String, Computed: true},
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"foo": {Type: cty.List(cty.String), Optional: true},
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},
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},
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@ -654,6 +654,25 @@ func (d *evaluationStateData) GetResource(addr addrs.Resource, rng tfdiags.Sourc
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return cty.DynamicVal, diags
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}
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// Build the provider address from configuration, since we may not have
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// state available in all cases.
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// We need to build an abs provider address, but we can use a default
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// instance since we're only interested in the schema.
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providerAddr := moduleAddr.ProviderConfigDefault(config.Provider)
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schema := d.getResourceSchema(addr, providerAddr)
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if schema == nil {
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// This shouldn't happen, since validation before we get here should've
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// taken care of it, but we'll show a reasonable error message anyway.
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: `Missing resource type schema`,
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Detail: fmt.Sprintf("No schema is available for %s in %s. This is a bug in Terraform and should be reported.", addr, providerAddr),
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Subject: rng.ToHCL().Ptr(),
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})
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return cty.DynamicVal, diags
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}
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ty := schema.ImpliedType()
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rs := d.Evaluator.State.Resource(addr.Absolute(d.ModulePath))
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if rs == nil {
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@ -675,34 +694,27 @@ func (d *evaluationStateData) GetResource(addr addrs.Resource, rng tfdiags.Sourc
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// (since a planned destroy cannot yet remove root outputs), we
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// need to return a dynamic value here to allow evaluation to
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// continue.
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log.Printf("[ERROR] unknown instance %q referenced during plan", addr.Absolute(d.ModulePath))
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log.Printf("[ERROR] unknown instance %q referenced during %s", addr.Absolute(d.ModulePath), d.Operation)
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return cty.DynamicVal, diags
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}
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default:
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// We should only end up here during the validate walk,
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// since later walks should have at least partial states populated
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// for all resources in the configuration.
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return cty.DynamicVal, diags
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if d.Operation != walkValidate {
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log.Printf("[ERROR] missing state for %q while in %s\n", addr.Absolute(d.ModulePath), d.Operation)
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}
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// Validation is done with only the configuration, so generate
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// unknown values of the correct shape for evaluation.
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switch {
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case config.Count != nil:
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return cty.UnknownVal(cty.List(ty)), diags
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case config.ForEach != nil:
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return cty.UnknownVal(cty.Map(ty)), diags
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default:
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return cty.UnknownVal(ty), diags
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}
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}
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}
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providerAddr := rs.ProviderConfig
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schema := d.getResourceSchema(addr, providerAddr)
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if schema == nil {
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// This shouldn't happen, since validation before we get here should've
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// taken care of it, but we'll show a reasonable error message anyway.
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: `Missing resource type schema`,
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Detail: fmt.Sprintf("No schema is available for %s in %s. This is a bug in Terraform and should be reported.", addr, providerAddr),
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Subject: rng.ToHCL().Ptr(),
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})
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return cty.DynamicVal, diags
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}
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ty := schema.ImpliedType()
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// Decode all instances in the current state
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instances := map[addrs.InstanceKey]cty.Value{}
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pendingDestroy := d.Evaluator.Changes.IsFullDestroy()
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@ -862,28 +874,6 @@ func (d *evaluationStateData) GetResource(addr addrs.Resource, rng tfdiags.Sourc
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ret = val
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}
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// since the plan was not yet created during validate, the values we
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// collected here may not correspond with configuration, so they must be
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// unknown.
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if d.Operation == walkValidate {
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// While we know the type here and it would be nice to validate whether
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// indexes are valid or not, because tuples and objects have fixed
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// numbers of elements we can't simply return an unknown value of the
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// same type since we have not expanded any instances during
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// validation.
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//
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// In order to validate the expression a little precisely, we'll create
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// an unknown map or list here to get more type information.
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switch {
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case config.Count != nil:
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ret = cty.UnknownVal(cty.List(ty))
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case config.ForEach != nil:
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ret = cty.UnknownVal(cty.Map(ty))
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default:
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ret = cty.UnknownVal(ty)
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}
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}
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return ret, diags
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}
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@ -1,4 +1,4 @@
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resource "aws_instance" "web" {
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foo = "${aws_instance.web.*.foo}"
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foo = aws_instance.web[*].id
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count = 4
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}
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