126 lines
3 KiB
Go
126 lines
3 KiB
Go
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package cty
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import (
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"bytes"
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"encoding/gob"
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"fmt"
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"math/big"
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)
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// GobEncode is an implementation of the gob.GobEncoder interface, which
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// allows Values to be included in structures encoded with encoding/gob.
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//
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// Currently it is not possible to represent values of capsule types in gob,
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// because the types themselves cannot be represented.
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func (val Value) GobEncode() ([]byte, error) {
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buf := &bytes.Buffer{}
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enc := gob.NewEncoder(buf)
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gv := gobValue{
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Version: 0,
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Ty: val.ty,
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V: val.v,
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}
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err := enc.Encode(gv)
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if err != nil {
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return nil, fmt.Errorf("error encoding cty.Value: %s", err)
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}
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return buf.Bytes(), nil
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}
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// GobDecode is an implementation of the gob.GobDecoder interface, which
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// inverts the operation performed by GobEncode. See the documentation of
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// GobEncode for considerations when using cty.Value instances with gob.
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func (val *Value) GobDecode(buf []byte) error {
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r := bytes.NewReader(buf)
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dec := gob.NewDecoder(r)
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var gv gobValue
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err := dec.Decode(&gv)
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if err != nil {
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return fmt.Errorf("error decoding cty.Value: %s", err)
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}
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if gv.Version != 0 {
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return fmt.Errorf("unsupported cty.Value encoding version %d; only 0 is supported", gv.Version)
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}
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// big.Float seems to, for some reason, lose its "pointerness" when we
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// round-trip it, so we'll fix that here.
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if bf, ok := gv.V.(big.Float); ok {
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gv.V = &bf
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}
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val.ty = gv.Ty
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val.v = gv.V
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return nil
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}
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// GobEncode is an implementation of the gob.GobEncoder interface, which
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// allows Types to be included in structures encoded with encoding/gob.
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//
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// Currently it is not possible to represent capsule types in gob.
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func (t Type) GobEncode() ([]byte, error) {
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buf := &bytes.Buffer{}
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enc := gob.NewEncoder(buf)
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gt := gobType{
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Version: 0,
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Impl: t.typeImpl,
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}
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err := enc.Encode(gt)
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if err != nil {
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return nil, fmt.Errorf("error encoding cty.Type: %s", err)
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}
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return buf.Bytes(), nil
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}
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// GobDecode is an implementatino of the gob.GobDecoder interface, which
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// reverses the encoding performed by GobEncode to allow types to be recovered
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// from gob buffers.
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func (t *Type) GobDecode(buf []byte) error {
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r := bytes.NewReader(buf)
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dec := gob.NewDecoder(r)
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var gt gobType
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err := dec.Decode(>)
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if err != nil {
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return fmt.Errorf("error decoding cty.Type: %s", err)
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}
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if gt.Version != 0 {
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return fmt.Errorf("unsupported cty.Type encoding version %d; only 0 is supported", gt.Version)
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}
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t.typeImpl = gt.Impl
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return nil
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}
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// Capsule types cannot currently be gob-encoded, because they rely on pointer
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// equality and we have no way to recover the original pointer on decode.
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func (t *capsuleType) GobEncode() ([]byte, error) {
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return nil, fmt.Errorf("cannot gob-encode capsule type %q", t.FriendlyName(friendlyTypeName))
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}
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func (t *capsuleType) GobDecode() ([]byte, error) {
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return nil, fmt.Errorf("cannot gob-decode capsule type %q", t.FriendlyName(friendlyTypeName))
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}
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type gobValue struct {
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Version int
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Ty Type
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V interface{}
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}
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type gobType struct {
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Version int
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Impl typeImpl
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}
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type gobCapsuleTypeImpl struct {
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}
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