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package dynblock
import (
"fmt"
"github.com/hashicorp/hcl2/hcl"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/convert"
)
type expandSpec struct {
blockType string
blockTypeRange hcl.Range
defRange hcl.Range
forEachVal cty.Value
iteratorName string
labelExprs []hcl.Expression
contentBody hcl.Body
inherited map[string]*iteration
}
func (b *expandBody) decodeSpec(blockS *hcl.BlockHeaderSchema, rawSpec *hcl.Block) (*expandSpec, hcl.Diagnostics) {
var diags hcl.Diagnostics
var schema *hcl.BodySchema
if len(blockS.LabelNames) != 0 {
schema = dynamicBlockBodySchemaLabels
} else {
schema = dynamicBlockBodySchemaNoLabels
}
specContent, specDiags := rawSpec.Body.Content(schema)
diags = append(diags, specDiags...)
if specDiags.HasErrors() {
return nil, diags
}
//// for_each attribute
eachAttr := specContent.Attributes["for_each"]
eachVal, eachDiags := eachAttr.Expr.Value(b.forEachCtx)
diags = append(diags, eachDiags...)
if !eachVal.CanIterateElements() && eachVal.Type() != cty.DynamicPseudoType {
// We skip this error for DynamicPseudoType because that means we either
// have a null (which is checked immediately below) or an unknown
// (which is handled in the expandBody Content methods).
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid dynamic for_each value",
Detail: fmt.Sprintf("Cannot use a %s value in for_each. An iterable collection is required.", eachVal.Type().FriendlyName()),
Subject: eachAttr.Expr.Range().Ptr(),
Expression: eachAttr.Expr,
EvalContext: b.forEachCtx,
})
return nil, diags
}
if eachVal.IsNull() {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid dynamic for_each value",
Detail: "Cannot use a null value in for_each.",
Subject: eachAttr.Expr.Range().Ptr(),
Expression: eachAttr.Expr,
EvalContext: b.forEachCtx,
})
return nil, diags
}
//// iterator attribute
iteratorName := blockS.Type
if iteratorAttr := specContent.Attributes["iterator"]; iteratorAttr != nil {
itTraversal, itDiags := hcl.AbsTraversalForExpr(iteratorAttr.Expr)
diags = append(diags, itDiags...)
if itDiags.HasErrors() {
return nil, diags
}
if len(itTraversal) != 1 {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid dynamic iterator name",
Detail: "Dynamic iterator must be a single variable name.",
Subject: itTraversal.SourceRange().Ptr(),
})
return nil, diags
}
iteratorName = itTraversal.RootName()
}
var labelExprs []hcl.Expression
if labelsAttr := specContent.Attributes["labels"]; labelsAttr != nil {
var labelDiags hcl.Diagnostics
labelExprs, labelDiags = hcl.ExprList(labelsAttr.Expr)
diags = append(diags, labelDiags...)
if labelDiags.HasErrors() {
return nil, diags
}
if len(labelExprs) > len(blockS.LabelNames) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Extraneous dynamic block label",
Detail: fmt.Sprintf("Blocks of type %q require %d label(s).", blockS.Type, len(blockS.LabelNames)),
Subject: labelExprs[len(blockS.LabelNames)].Range().Ptr(),
})
return nil, diags
} else if len(labelExprs) < len(blockS.LabelNames) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Insufficient dynamic block labels",
Detail: fmt.Sprintf("Blocks of type %q require %d label(s).", blockS.Type, len(blockS.LabelNames)),
Subject: labelsAttr.Expr.Range().Ptr(),
})
return nil, diags
}
}
// Since our schema requests only blocks of type "content", we can assume
// that all entries in specContent.Blocks are content blocks.
if len(specContent.Blocks) == 0 {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Missing dynamic content block",
Detail: "A dynamic block must have a nested block of type \"content\" to describe the body of each generated block.",
Subject: &specContent.MissingItemRange,
})
return nil, diags
}
if len(specContent.Blocks) > 1 {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Extraneous dynamic content block",
Detail: "Only one nested content block is allowed for each dynamic block.",
Subject: &specContent.Blocks[1].DefRange,
})
return nil, diags
}
return &expandSpec{
blockType: blockS.Type,
blockTypeRange: rawSpec.LabelRanges[0],
defRange: rawSpec.DefRange,
forEachVal: eachVal,
iteratorName: iteratorName,
labelExprs: labelExprs,
contentBody: specContent.Blocks[0].Body,
}, diags
}
func (s *expandSpec) newBlock(i *iteration, ctx *hcl.EvalContext) (*hcl.Block, hcl.Diagnostics) {
var diags hcl.Diagnostics
var labels []string
var labelRanges []hcl.Range
lCtx := i.EvalContext(ctx)
for _, labelExpr := range s.labelExprs {
labelVal, labelDiags := labelExpr.Value(lCtx)
diags = append(diags, labelDiags...)
if labelDiags.HasErrors() {
return nil, diags
}
var convErr error
labelVal, convErr = convert.Convert(labelVal, cty.String)
if convErr != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid dynamic block label",
Detail: fmt.Sprintf("Cannot use this value as a dynamic block label: %s.", convErr),
Subject: labelExpr.Range().Ptr(),
Expression: labelExpr,
EvalContext: lCtx,
})
return nil, diags
}
if labelVal.IsNull() {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid dynamic block label",
Detail: "Cannot use a null value as a dynamic block label.",
Subject: labelExpr.Range().Ptr(),
Expression: labelExpr,
EvalContext: lCtx,
})
return nil, diags
}
if !labelVal.IsKnown() {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid dynamic block label",
Detail: "This value is not yet known. Dynamic block labels must be immediately-known values.",
Subject: labelExpr.Range().Ptr(),
Expression: labelExpr,
EvalContext: lCtx,
})
return nil, diags
}
labels = append(labels, labelVal.AsString())
labelRanges = append(labelRanges, labelExpr.Range())
}
block := &hcl.Block{
Type: s.blockType,
TypeRange: s.blockTypeRange,
Labels: labels,
LabelRanges: labelRanges,
DefRange: s.defRange,
Body: s.contentBody,
}
return block, diags
}
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