293 lines
9.7 KiB
Go
293 lines
9.7 KiB
Go
package objchange
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import (
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"fmt"
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"strconv"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/convert"
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"github.com/hashicorp/terraform/configs/configschema"
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)
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// AssertObjectCompatible checks whether the given "actual" value is a valid
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// completion of the possibly-partially-unknown "planned" value.
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//
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// This means that any known leaf value in "planned" must be equal to the
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// corresponding value in "actual", and various other similar constraints.
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//
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// Any inconsistencies are reported by returning a non-zero number of errors.
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// These errors are usually (but not necessarily) cty.PathError values
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// referring to a particular nested value within the "actual" value.
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//
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// The two values must have types that conform to the given schema's implied
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// type, or this function will panic.
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func AssertObjectCompatible(schema *configschema.Block, planned, actual cty.Value) []error {
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return assertObjectCompatible(schema, planned, actual, nil)
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}
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func assertObjectCompatible(schema *configschema.Block, planned, actual cty.Value, path cty.Path) []error {
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var errs []error
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if planned.IsNull() && !actual.IsNull() {
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errs = append(errs, path.NewErrorf("was absent, but now present"))
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return errs
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}
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if actual.IsNull() && !planned.IsNull() {
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errs = append(errs, path.NewErrorf("was present, but now absent"))
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return errs
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}
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if planned.IsNull() {
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// No further checks possible if both values are null
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return errs
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}
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for name := range schema.Attributes {
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plannedV := planned.GetAttr(name)
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actualV := actual.GetAttr(name)
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path := append(path, cty.GetAttrStep{Name: name})
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moreErrs := assertValueCompatible(plannedV, actualV, path)
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errs = append(errs, moreErrs...)
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}
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for name, blockS := range schema.BlockTypes {
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plannedV := planned.GetAttr(name)
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actualV := actual.GetAttr(name)
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// As a special case, we permit a "planned" block with exactly one
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// element where all of the "leaf" values are unknown, since that's
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// what HCL's dynamic block extension generates if the for_each
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// expression is itself unknown and thus it cannot predict how many
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// child blocks will get created.
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switch blockS.Nesting {
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case configschema.NestingSingle:
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if allLeafValuesUnknown(plannedV) && !plannedV.IsNull() {
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return errs
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}
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case configschema.NestingList, configschema.NestingMap, configschema.NestingSet:
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if plannedV.IsKnown() && !plannedV.IsNull() && plannedV.LengthInt() == 1 {
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elemVs := plannedV.AsValueSlice()
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if allLeafValuesUnknown(elemVs[0]) {
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return errs
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}
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}
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default:
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panic(fmt.Sprintf("unsupported nesting mode %s", blockS.Nesting))
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}
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path := append(path, cty.GetAttrStep{Name: name})
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switch blockS.Nesting {
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case configschema.NestingSingle:
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moreErrs := assertObjectCompatible(&blockS.Block, plannedV, actualV, path)
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errs = append(errs, moreErrs...)
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case configschema.NestingList:
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// A NestingList might either be a list or a tuple, depending on
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// whether there are dynamically-typed attributes inside. However,
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// both support a similar-enough API that we can treat them the
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// same for our purposes here.
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if !plannedV.IsKnown() || plannedV.IsNull() || actualV.IsNull() {
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continue
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}
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plannedL := plannedV.LengthInt()
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actualL := actualV.LengthInt()
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if plannedL != actualL {
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errs = append(errs, path.NewErrorf("block count changed from %d to %d", plannedL, actualL))
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continue
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}
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for it := plannedV.ElementIterator(); it.Next(); {
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idx, plannedEV := it.Element()
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if !actualV.HasIndex(idx).True() {
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continue
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}
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actualEV := actualV.Index(idx)
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moreErrs := assertObjectCompatible(&blockS.Block, plannedEV, actualEV, append(path, cty.IndexStep{Key: idx}))
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errs = append(errs, moreErrs...)
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}
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case configschema.NestingMap:
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// A NestingMap might either be a map or an object, depending on
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// whether there are dynamically-typed attributes inside, but
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// that's decided statically and so both values will have the same
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// kind.
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if plannedV.Type().IsObjectType() {
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plannedAtys := plannedV.Type().AttributeTypes()
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actualAtys := actualV.Type().AttributeTypes()
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for k := range plannedAtys {
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if _, ok := actualAtys[k]; !ok {
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errs = append(errs, path.NewErrorf("block key %q has vanished", k))
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continue
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}
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plannedEV := plannedV.GetAttr(k)
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actualEV := actualV.GetAttr(k)
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moreErrs := assertObjectCompatible(&blockS.Block, plannedEV, actualEV, append(path, cty.GetAttrStep{Name: k}))
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errs = append(errs, moreErrs...)
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}
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for k := range actualAtys {
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if _, ok := plannedAtys[k]; !ok {
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errs = append(errs, path.NewErrorf("new block key %q has appeared", k))
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continue
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}
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}
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} else {
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if !plannedV.IsKnown() || plannedV.IsNull() || actualV.IsNull() {
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continue
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}
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plannedL := plannedV.LengthInt()
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actualL := actualV.LengthInt()
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if plannedL != actualL {
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errs = append(errs, path.NewErrorf("block count changed from %d to %d", plannedL, actualL))
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continue
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}
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for it := plannedV.ElementIterator(); it.Next(); {
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idx, plannedEV := it.Element()
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if !actualV.HasIndex(idx).True() {
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continue
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}
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actualEV := actualV.Index(idx)
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moreErrs := assertObjectCompatible(&blockS.Block, plannedEV, actualEV, append(path, cty.IndexStep{Key: idx}))
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errs = append(errs, moreErrs...)
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}
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}
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case configschema.NestingSet:
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// We can't do any reasonable matching of set elements since their
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// content is also their key, and so we have no way to correlate
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// them. Because of this, we simply verify that we still have the
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// same number of elements.
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if !plannedV.IsKnown() || plannedV.IsNull() || actualV.IsNull() {
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continue
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}
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plannedL := plannedV.LengthInt()
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actualL := actualV.LengthInt()
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if plannedL < actualL {
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errs = append(errs, path.NewErrorf("block set length changed from %d to %d", plannedL, actualL))
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}
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default:
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panic(fmt.Sprintf("unsupported nesting mode %s", blockS.Nesting))
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}
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}
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return errs
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}
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func assertValueCompatible(planned, actual cty.Value, path cty.Path) []error {
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// NOTE: We don't normally use the GoString rendering of cty.Value in
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// user-facing error messages as a rule, but we make an exception
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// for this function because we expect the user to pass this message on
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// verbatim to the provider development team and so more detail is better.
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var errs []error
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if planned.Type() == cty.DynamicPseudoType {
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// Anything goes, then
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return errs
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}
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if problems := planned.Type().TestConformance(actual.Type()); len(problems) > 0 {
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errs = append(errs, path.NewErrorf("wrong final value type: %s", convert.MismatchMessage(actual.Type(), planned.Type())))
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// If the types don't match then we can't do any other comparisons,
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// so we bail early.
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return errs
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}
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if !planned.IsKnown() {
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// We didn't know what were going to end up with during plan, so
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// anything goes during apply.
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return errs
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}
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if actual.IsNull() {
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if planned.IsNull() {
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return nil
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}
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errs = append(errs, path.NewErrorf("was %#v, but now null", planned))
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return errs
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}
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if planned.IsNull() {
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errs = append(errs, path.NewErrorf("was null, but now %#v", actual))
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return errs
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}
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ty := planned.Type()
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switch {
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case !actual.IsKnown():
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errs = append(errs, path.NewErrorf("was known, but now unknown"))
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case ty.IsPrimitiveType():
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if !actual.Equals(planned).True() {
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errs = append(errs, path.NewErrorf("was %#v, but now %#v", planned, actual))
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}
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case ty.IsListType() || ty.IsMapType() || ty.IsTupleType():
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for it := planned.ElementIterator(); it.Next(); {
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k, plannedV := it.Element()
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if !actual.HasIndex(k).True() {
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errs = append(errs, path.NewErrorf("element %s has vanished", indexStrForErrors(k)))
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continue
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}
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actualV := actual.Index(k)
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moreErrs := assertValueCompatible(plannedV, actualV, append(path, cty.IndexStep{Key: k}))
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errs = append(errs, moreErrs...)
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}
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for it := actual.ElementIterator(); it.Next(); {
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k, _ := it.Element()
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if !planned.HasIndex(k).True() {
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errs = append(errs, path.NewErrorf("new element %s has appeared", indexStrForErrors(k)))
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}
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}
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case ty.IsObjectType():
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atys := ty.AttributeTypes()
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for name := range atys {
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// Because we already tested that the two values have the same type,
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// we can assume that the same attributes are present in both and
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// focus just on testing their values.
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plannedV := planned.GetAttr(name)
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actualV := actual.GetAttr(name)
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moreErrs := assertValueCompatible(plannedV, actualV, append(path, cty.GetAttrStep{Name: name}))
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errs = append(errs, moreErrs...)
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}
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case ty.IsSetType():
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// We can't really do anything useful for sets here because changing
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// an unknown element to known changes the identity of the element, and
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// so we can't correlate them properly. However, we will at least check
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// to ensure that the number of elements is consistent, along with
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// the general type-match checks we ran earlier in this function.
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if planned.IsKnown() && !planned.IsNull() && !actual.IsNull() {
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plannedL := planned.LengthInt()
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actualL := actual.LengthInt()
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if plannedL < actualL {
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errs = append(errs, path.NewErrorf("length changed from %d to %d", plannedL, actualL))
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}
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}
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}
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return errs
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}
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func indexStrForErrors(v cty.Value) string {
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switch v.Type() {
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case cty.Number:
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return v.AsBigFloat().Text('f', -1)
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case cty.String:
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return strconv.Quote(v.AsString())
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default:
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// Should be impossible, since no other index types are allowed!
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return fmt.Sprintf("%#v", v)
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}
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}
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func allLeafValuesUnknown(v cty.Value) bool {
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seenKnownValue := false
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cty.Walk(v, func(path cty.Path, cv cty.Value) (bool, error) {
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if cv.IsNull() {
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seenKnownValue = true
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}
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if cv.Type().IsPrimitiveType() && cv.IsKnown() {
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seenKnownValue = true
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}
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return true, nil
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})
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return !seenKnownValue
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}
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