379 lines
12 KiB
Go
379 lines
12 KiB
Go
package addrs
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import (
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"fmt"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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"github.com/hashicorp/terraform/internal/tfdiags"
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)
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// Reference describes a reference to an address with source location
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// information.
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type Reference struct {
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Subject Referenceable
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SourceRange tfdiags.SourceRange
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Remaining hcl.Traversal
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}
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// ParseRef attempts to extract a referencable address from the prefix of the
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// given traversal, which must be an absolute traversal or this function
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// will panic.
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//
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// If no error diagnostics are returned, the returned reference includes the
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// address that was extracted, the source range it was extracted from, and any
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// remaining relative traversal that was not consumed as part of the
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// reference.
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//
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// If error diagnostics are returned then the Reference value is invalid and
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// must not be used.
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func ParseRef(traversal hcl.Traversal) (*Reference, tfdiags.Diagnostics) {
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ref, diags := parseRef(traversal)
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// Normalize a little to make life easier for callers.
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if ref != nil {
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if len(ref.Remaining) == 0 {
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ref.Remaining = nil
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}
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}
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return ref, diags
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}
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// ParseRefStr is a helper wrapper around ParseRef that takes a string
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// and parses it with the HCL native syntax traversal parser before
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// interpreting it.
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//
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// This should be used only in specialized situations since it will cause the
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// created references to not have any meaningful source location information.
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// If a reference string is coming from a source that should be identified in
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// error messages then the caller should instead parse it directly using a
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// suitable function from the HCL API and pass the traversal itself to
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// ParseRef.
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//
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// Error diagnostics are returned if either the parsing fails or the analysis
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// of the traversal fails. There is no way for the caller to distinguish the
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// two kinds of diagnostics programmatically. If error diagnostics are returned
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// the returned reference may be nil or incomplete.
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func ParseRefStr(str string) (*Reference, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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traversal, parseDiags := hclsyntax.ParseTraversalAbs([]byte(str), "", hcl.Pos{Line: 1, Column: 1})
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diags = diags.Append(parseDiags)
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if parseDiags.HasErrors() {
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return nil, diags
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}
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ref, targetDiags := ParseRef(traversal)
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diags = diags.Append(targetDiags)
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return ref, diags
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}
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func parseRef(traversal hcl.Traversal) (*Reference, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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root := traversal.RootName()
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rootRange := traversal[0].SourceRange()
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switch root {
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case "count":
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name, rng, remain, diags := parseSingleAttrRef(traversal)
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return &Reference{
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Subject: CountAttr{Name: name},
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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Remaining: remain,
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}, diags
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case "each":
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name, rng, remain, diags := parseSingleAttrRef(traversal)
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return &Reference{
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Subject: ForEachAttr{Name: name},
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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Remaining: remain,
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}, diags
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case "data":
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if len(traversal) < 3 {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: `The "data" object must be followed by two attribute names: the data source type and the resource name.`,
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Subject: traversal.SourceRange().Ptr(),
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})
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return nil, diags
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}
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remain := traversal[1:] // trim off "data" so we can use our shared resource reference parser
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return parseResourceRef(DataResourceMode, rootRange, remain)
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case "resource":
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// This is an alias for the normal case of just using a managed resource
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// type as a top-level symbol, which will serve as an escape mechanism
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// if a later edition of the Terraform language introduces a new
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// reference prefix that conflicts with a resource type name in an
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// existing provider. In that case, the edition upgrade tool can
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// rewrite foo.bar into resource.foo.bar to ensure that "foo" remains
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// interpreted as a resource type name rather than as the new reserved
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// word.
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if len(traversal) < 3 {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: `The "resource" object must be followed by two attribute names: the resource type and the resource name.`,
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Subject: traversal.SourceRange().Ptr(),
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})
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return nil, diags
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}
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remain := traversal[1:] // trim off "resource" so we can use our shared resource reference parser
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return parseResourceRef(ManagedResourceMode, rootRange, remain)
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case "local":
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name, rng, remain, diags := parseSingleAttrRef(traversal)
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return &Reference{
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Subject: LocalValue{Name: name},
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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Remaining: remain,
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}, diags
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case "module":
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callName, callRange, remain, diags := parseSingleAttrRef(traversal)
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if diags.HasErrors() {
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return nil, diags
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}
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// A traversal starting with "module" can either be a reference to an
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// entire module, or to a single output from a module instance,
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// depending on what we find after this introducer.
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callInstance := ModuleCallInstance{
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Call: ModuleCall{
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Name: callName,
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},
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Key: NoKey,
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}
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if len(remain) == 0 {
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// Reference to an entire module. Might alternatively be a
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// reference to a single instance of a particular module, but the
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// caller will need to deal with that ambiguity since we don't have
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// enough context here.
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return &Reference{
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Subject: callInstance.Call,
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SourceRange: tfdiags.SourceRangeFromHCL(callRange),
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Remaining: remain,
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}, diags
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}
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if idxTrav, ok := remain[0].(hcl.TraverseIndex); ok {
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var err error
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callInstance.Key, err = ParseInstanceKey(idxTrav.Key)
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if err != nil {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid index key",
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Detail: fmt.Sprintf("Invalid index for module instance: %s.", err),
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Subject: &idxTrav.SrcRange,
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})
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return nil, diags
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}
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remain = remain[1:]
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if len(remain) == 0 {
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// Also a reference to an entire module instance, but we have a key
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// now.
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return &Reference{
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Subject: callInstance,
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SourceRange: tfdiags.SourceRangeFromHCL(hcl.RangeBetween(callRange, idxTrav.SrcRange)),
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Remaining: remain,
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}, diags
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}
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}
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if attrTrav, ok := remain[0].(hcl.TraverseAttr); ok {
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remain = remain[1:]
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return &Reference{
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Subject: ModuleCallInstanceOutput{
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Name: attrTrav.Name,
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Call: callInstance,
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},
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SourceRange: tfdiags.SourceRangeFromHCL(hcl.RangeBetween(callRange, attrTrav.SrcRange)),
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Remaining: remain,
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}, diags
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}
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: "Module instance objects do not support this operation.",
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Subject: remain[0].SourceRange().Ptr(),
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})
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return nil, diags
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case "path":
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name, rng, remain, diags := parseSingleAttrRef(traversal)
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return &Reference{
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Subject: PathAttr{Name: name},
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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Remaining: remain,
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}, diags
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case "self":
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return &Reference{
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Subject: Self,
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SourceRange: tfdiags.SourceRangeFromHCL(rootRange),
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Remaining: traversal[1:],
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}, diags
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case "terraform":
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name, rng, remain, diags := parseSingleAttrRef(traversal)
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return &Reference{
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Subject: TerraformAttr{Name: name},
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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Remaining: remain,
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}, diags
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case "var":
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name, rng, remain, diags := parseSingleAttrRef(traversal)
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return &Reference{
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Subject: InputVariable{Name: name},
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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Remaining: remain,
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}, diags
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case "template", "lazy", "arg":
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// These names are all pre-emptively reserved in the hope of landing
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// some version of "template values" or "lazy expressions" feature
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// before the next opt-in language edition, but don't yet do anything.
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Reserved symbol name",
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Detail: fmt.Sprintf("The symbol name %q is reserved for use in a future Terraform version. If you are using a provider that already uses this as a resource type name, add the prefix \"resource.\" to force interpretation as a resource type name.", root),
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Subject: rootRange.Ptr(),
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})
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return nil, diags
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default:
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return parseResourceRef(ManagedResourceMode, rootRange, traversal)
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}
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}
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func parseResourceRef(mode ResourceMode, startRange hcl.Range, traversal hcl.Traversal) (*Reference, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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if len(traversal) < 2 {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: `A reference to a resource type must be followed by at least one attribute access, specifying the resource name.`,
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Subject: hcl.RangeBetween(traversal[0].SourceRange(), traversal[len(traversal)-1].SourceRange()).Ptr(),
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})
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return nil, diags
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}
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var typeName, name string
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switch tt := traversal[0].(type) { // Could be either root or attr, depending on our resource mode
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case hcl.TraverseRoot:
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typeName = tt.Name
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case hcl.TraverseAttr:
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typeName = tt.Name
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default:
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// If it isn't a TraverseRoot then it must be a "data" reference.
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: `The "data" object does not support this operation.`,
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Subject: traversal[0].SourceRange().Ptr(),
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})
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return nil, diags
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}
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attrTrav, ok := traversal[1].(hcl.TraverseAttr)
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if !ok {
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var what string
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switch mode {
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case DataResourceMode:
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what = "data source"
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default:
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what = "resource type"
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}
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: fmt.Sprintf(`A reference to a %s must be followed by at least one attribute access, specifying the resource name.`, what),
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Subject: traversal[1].SourceRange().Ptr(),
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})
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return nil, diags
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}
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name = attrTrav.Name
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rng := hcl.RangeBetween(startRange, attrTrav.SrcRange)
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remain := traversal[2:]
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resourceAddr := Resource{
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Mode: mode,
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Type: typeName,
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Name: name,
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}
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resourceInstAddr := ResourceInstance{
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Resource: resourceAddr,
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Key: NoKey,
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}
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if len(remain) == 0 {
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// This might actually be a reference to the collection of all instances
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// of the resource, but we don't have enough context here to decide
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// so we'll let the caller resolve that ambiguity.
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return &Reference{
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Subject: resourceAddr,
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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}, diags
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}
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if idxTrav, ok := remain[0].(hcl.TraverseIndex); ok {
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var err error
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resourceInstAddr.Key, err = ParseInstanceKey(idxTrav.Key)
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if err != nil {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid index key",
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Detail: fmt.Sprintf("Invalid index for resource instance: %s.", err),
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Subject: &idxTrav.SrcRange,
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})
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return nil, diags
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}
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remain = remain[1:]
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rng = hcl.RangeBetween(rng, idxTrav.SrcRange)
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}
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return &Reference{
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Subject: resourceInstAddr,
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SourceRange: tfdiags.SourceRangeFromHCL(rng),
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Remaining: remain,
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}, diags
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}
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func parseSingleAttrRef(traversal hcl.Traversal) (string, hcl.Range, hcl.Traversal, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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root := traversal.RootName()
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rootRange := traversal[0].SourceRange()
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if len(traversal) < 2 {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: fmt.Sprintf("The %q object cannot be accessed directly. Instead, access one of its attributes.", root),
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Subject: &rootRange,
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})
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return "", hcl.Range{}, nil, diags
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}
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if attrTrav, ok := traversal[1].(hcl.TraverseAttr); ok {
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return attrTrav.Name, hcl.RangeBetween(rootRange, attrTrav.SrcRange), traversal[2:], diags
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}
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid reference",
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Detail: fmt.Sprintf("The %q object does not support this operation.", root),
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Subject: traversal[1].SourceRange().Ptr(),
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})
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return "", hcl.Range{}, nil, diags
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}
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