core: ResourceAddress.Contains method
This is similar in purpose to Equals but it takes a hierarchical approach where modules contain their child modules, resources are contained by their modules, and indexed resource instances are contained by their resource names. Unlike "Equals", Contains is intended to be transitive, so if A contains B and B contains C, then C necessarily contains A. It is also directional: if A contains B then B does not also contain A unless A and B are identical. This results in more intuitive behavior for use-cases where the goal is to select a portion of the address space for an operation.
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@ -248,6 +248,53 @@ func ParseResourceAddress(s string) (*ResourceAddress, error) {
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}, nil
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}
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// Contains returns true if and only if the given node is contained within
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// the receiver.
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//
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// Containment is defined in terms of the module and resource heirarchy:
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// a resource is contained within its module and any ancestor modules,
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// an indexed resource instance is contained with the unindexed resource, etc.
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func (addr *ResourceAddress) Contains(other *ResourceAddress) bool {
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ourPath := addr.Path
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givenPath := other.Path
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if len(givenPath) < len(ourPath) {
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return false
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}
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for i := range ourPath {
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if ourPath[i] != givenPath[i] {
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return false
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}
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}
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// If the receiver is a whole-module address then the path prefix
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// matching is all we need.
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if !addr.HasResourceSpec() {
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return true
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}
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if addr.Type != other.Type || addr.Name != other.Name || addr.Mode != other.Mode {
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return false
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}
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if addr.Index != -1 && addr.Index != other.Index {
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return false
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}
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if addr.InstanceTypeSet && (addr.InstanceTypeSet != other.InstanceTypeSet || addr.InstanceType != other.InstanceType) {
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return false
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}
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return true
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}
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// Equals returns true if the receiver matches the given address.
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//
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// The name of this method is a misnomer, since it doesn't test for exact
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// equality. Instead, it tests that the _specified_ parts of each
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// address match, treating any unspecified parts as wildcards.
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//
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// See also Contains, which takes a more heirarchical approach to comparing
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// addresses.
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func (addr *ResourceAddress) Equals(raw interface{}) bool {
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other, ok := raw.(*ResourceAddress)
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if !ok {
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@ -324,7 +371,7 @@ func tokenizeResourceAddress(s string) (map[string]string, error) {
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// string "aws_instance.web.tainted[1]"
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re := regexp.MustCompile(`\A` +
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// "module.foo.module.bar" (optional)
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`(?P<path>(?:module\.[^.]+\.?)*)` +
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`(?P<path>(?:module\.(?P<module_name>[^.]+)\.?)*)` +
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// possibly "data.", if targeting is a data resource
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`(?P<data_prefix>(?:data\.)?)` +
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// "aws_instance.web" (optional when module path specified)
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@ -304,6 +304,306 @@ func TestParseResourceAddress(t *testing.T) {
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}
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}
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func TestResourceAddressContains(t *testing.T) {
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tests := []struct {
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Address *ResourceAddress
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Other *ResourceAddress
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Want bool
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}{
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{
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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true,
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},
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{
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: 0,
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},
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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true,
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},
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{
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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true,
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},
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{
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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true,
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},
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{
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&ResourceAddress{
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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true,
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},
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{
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&ResourceAddress{
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"bar"},
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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true,
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},
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{
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&ResourceAddress{
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Path: []string{"bar"},
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"bar"},
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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true,
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},
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{
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&ResourceAddress{
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Path: []string{"bar"},
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"bar", "baz"},
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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true,
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},
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{
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&ResourceAddress{
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Path: []string{"bar"},
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"bar", "baz"},
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InstanceTypeSet: false,
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Index: -1,
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},
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true,
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},
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{
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&ResourceAddress{
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Path: []string{"bar"},
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"bar", "baz", "foo", "pizza"},
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InstanceTypeSet: false,
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Index: -1,
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},
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true,
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},
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{
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "bar",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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false,
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},
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{
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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&ResourceAddress{
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Mode: config.DataResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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false,
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},
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{
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&ResourceAddress{
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Path: []string{"bar"},
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"baz"},
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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false,
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},
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{
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&ResourceAddress{
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Path: []string{"bar"},
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"baz", "bar"},
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: -1,
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},
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false,
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},
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{
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: true,
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InstanceType: TypePrimary,
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Index: 0,
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},
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&ResourceAddress{
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Mode: config.ManagedResourceMode,
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Type: "aws_instance",
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Name: "foo",
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InstanceTypeSet: false,
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Index: 0,
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},
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false,
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},
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{
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&ResourceAddress{
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Path: []string{"bar", "baz"},
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InstanceTypeSet: false,
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Index: -1,
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},
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&ResourceAddress{
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Path: []string{"bar"},
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InstanceTypeSet: false,
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Index: -1,
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},
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false,
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},
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{
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&ResourceAddress{
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Type: "aws_instance",
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Name: "foo",
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Index: 1,
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InstanceType: TypePrimary,
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Mode: config.ManagedResourceMode,
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},
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&ResourceAddress{
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Type: "aws_instance",
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Name: "foo",
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Index: -1,
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InstanceType: TypePrimary,
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Mode: config.ManagedResourceMode,
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},
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false,
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},
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}
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for _, test := range tests {
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t.Run(fmt.Sprintf("%s contains %s", test.Address, test.Other), func(t *testing.T) {
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got := test.Address.Contains(test.Other)
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if got != test.Want {
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t.Errorf(
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"wrong result\nrecv: %s\ngiven: %s\ngot: %#v\nwant: %#v",
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test.Address, test.Other,
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got, test.Want,
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)
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}
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})
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}
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}
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func TestResourceAddressEquals(t *testing.T) {
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cases := map[string]struct {
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Address *ResourceAddress
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