terraform/internal/configs/backend.go

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package configs
import (
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/hcldec"
"github.com/hashicorp/terraform/internal/configs/configschema"
"github.com/zclconf/go-cty/cty"
)
// Backend represents a "backend" block inside a "terraform" block in a module
// or file.
type Backend struct {
Type string
Config hcl.Body
TypeRange hcl.Range
DeclRange hcl.Range
}
func decodeBackendBlock(block *hcl.Block) (*Backend, hcl.Diagnostics) {
return &Backend{
Type: block.Labels[0],
TypeRange: block.LabelRanges[0],
Config: block.Body,
DeclRange: block.DefRange,
}, nil
}
// Hash produces a hash value for the reciever that covers the type and the
// portions of the config that conform to the given schema.
//
// If the config does not conform to the schema then the result is not
// meaningful for comparison since it will be based on an incomplete result.
//
// As an exception, required attributes in the schema are treated as optional
// for the purpose of hashing, so that an incomplete configuration can still
// be hashed. Other errors, such as extraneous attributes, have no such special
// case.
func (b *Backend) Hash(schema *configschema.Block) int {
// Don't fail if required attributes are not set. Instead, we'll just
// hash them as nulls.
schema = schema.NoneRequired()
spec := schema.DecoderSpec()
val, _ := hcldec.Decode(b.Config, spec, nil)
if val == cty.NilVal {
val = cty.UnknownVal(schema.ImpliedType())
}
toHash := cty.TupleVal([]cty.Value{
cty.StringVal(b.Type),
val,
})
return toHash.Hash()
}