/
proto.go
76 lines (66 loc) · 1.95 KB
/
proto.go
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package program
import (
"fmt"
"github.com/stripe/skycfg/go/protomodule"
"go.starlark.net/starlark"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
)
type skyProtoMessageType interface {
NewMessage() protoreflect.ProtoMessage
}
func protoDecode(registry *protoregistry.Types) starlark.Callable {
return starlark.NewBuiltin("proto.decode", func(
t *starlark.Thread,
fn *starlark.Builtin,
args starlark.Tuple,
kwargs []starlark.Tuple,
) (starlark.Value, error) {
var msgType starlark.Value
var value starlark.Bytes
if err := starlark.UnpackPositionalArgs(fn.Name(), args, kwargs, 2, &msgType, &value); err != nil {
return nil, err
}
protoMsgType, ok := msgType.(skyProtoMessageType)
if !ok {
return nil, fmt.Errorf("%s: for parameter 1: got %s, want proto.MessageType", fn.Name(), msgType.Type())
}
unmarshal := proto.UnmarshalOptions{
Resolver: registry,
}
decoded := protoMsgType.NewMessage()
if err := unmarshal.Unmarshal([]byte(value), decoded); err != nil {
return nil, err
}
return protomodule.NewMessage(decoded)
})
}
func protoEncode(registry *protoregistry.Types) starlark.Callable {
return starlark.NewBuiltin("proto.encode", func(
t *starlark.Thread,
fn *starlark.Builtin,
args starlark.Tuple,
kwargs []starlark.Tuple,
) (starlark.Value, error) {
var val starlark.Value
if err := starlark.UnpackPositionalArgs(fn.Name(), args, kwargs, 1, &val); err != nil {
return nil, err
}
msg, ok := protomodule.AsProtoMessage(val)
if !ok {
return nil, fmt.Errorf("%s: for parameter 1: got %s, want proto.Message", fn.Name(), val.Type())
}
marshal := proto.MarshalOptions{}
if len(kwargs) > 0 {
if err := starlark.UnpackArgs(fn.Name(), nil, kwargs); err != nil {
return nil, err
}
}
data, err := marshal.Marshal(msg)
if err != nil {
return nil, err
}
return starlark.Bytes(data), nil
})
}