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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package bindnodeutils | ||
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| import ( | ||
| "fmt" | ||
| "io" | ||
| "reflect" | ||
|
|
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| "github.com/ipld/go-ipld-prime" | ||
| "github.com/ipld/go-ipld-prime/codec" | ||
| "github.com/ipld/go-ipld-prime/datamodel" | ||
| "github.com/ipld/go-ipld-prime/node/bindnode" | ||
| "github.com/ipld/go-ipld-prime/schema" | ||
| ) | ||
|
|
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| // We use the prototype map to store TypedPrototype and bindnode options mapped | ||
| // against the Go type so we only have to run the schema parse once and we | ||
| // can be sure to use the right options (converters) whenever operating on | ||
| // this type. | ||
|
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| type prototypeData struct { | ||
| proto schema.TypedPrototype | ||
| options []bindnode.Option | ||
| } | ||
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| var prototype map[reflect.Type]prototypeData = make(map[reflect.Type]prototypeData) | ||
|
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| func typeOf(ptrValue interface{}) reflect.Type { | ||
| val := reflect.ValueOf(ptrValue).Type() | ||
| for val.Kind() == reflect.Ptr { | ||
| val = val.Elem() | ||
| } | ||
| return val | ||
| } | ||
|
|
||
| // lookup of cached TypedPrototype (and therefore Type) for a Go type, if not | ||
| // found, initial parse and setup and caching of the TypedPrototype will happen | ||
| func prototypeDataFor(ptrType interface{}) prototypeData { | ||
| typ := typeOf(ptrType) | ||
| proto, ok := prototype[typ] | ||
| if !ok { | ||
| panic(fmt.Sprintf("bindnode utils: type has not been registered: %s", typ.Name())) | ||
| } | ||
| return proto | ||
| } | ||
|
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| // RegisterType registers ptrType with schema such that it can be wrapped and | ||
| // unwrapped without needing the schema, Type, or TypedPrototype. | ||
| // Typically the typeName will match the Go type name, but it can be whatever | ||
| // is defined in the schema for the type being registered. | ||
| // | ||
| // May panic if the schema is invalid or the type doesn't match the schema. | ||
| func RegisterType(ptrType interface{}, schema string, typeName string, options ...bindnode.Option) { | ||
| typ := typeOf(ptrType) | ||
| if _, ok := prototype[typ]; ok { | ||
| panic(fmt.Sprintf("bindnode utils: type already registered: %s", typ.Name())) | ||
| } | ||
| typeSystem, err := ipld.LoadSchemaBytes([]byte(schema)) | ||
| if err != nil { | ||
| panic(fmt.Sprintf("bindnode utils: failed to load schema: %s", err.Error())) | ||
| } | ||
| schemaType := typeSystem.TypeByName(typeName) | ||
| if schemaType == nil { | ||
| panic(fmt.Sprintf("bindnode utils: schema for [%T] does not contain that named type [%s]", ptrType, typ.Name())) | ||
| } | ||
| prototype[typ] = prototypeData{ | ||
| bindnode.Prototype(ptrType, schemaType, options...), | ||
| options, | ||
| } | ||
| } | ||
|
|
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| // IsRegistered can be used to determine if the type has already been registered | ||
| // within this current application instance. | ||
| // Using RegisterType on an already registered type will cause a panic, so where | ||
| // this may be the case, IsRegistered can be used to check. | ||
| func IsRegistered(ptrType interface{}) bool { | ||
| _, ok := prototype[typeOf(ptrType)] | ||
| return ok | ||
| } | ||
|
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| // TypeFromReader deserializes DAG-CBOR from a Reader and instantiates the Go | ||
| // type that's provided as a pointer via the ptrValue argument. | ||
| func TypeFromReader(r io.Reader, ptrValue interface{}, decoder codec.Decoder) (interface{}, error) { | ||
| protoData := prototypeDataFor(ptrValue) | ||
| node, err := ipld.DecodeStreamingUsingPrototype(r, decoder, protoData.proto) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| typ := bindnode.Unwrap(node) | ||
| return typ, nil | ||
| } | ||
|
|
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| // TypeFromNode converts an datamodel.Node into an appropriate Go type that's | ||
| // provided as a pointer via the ptrValue argument | ||
| func TypeFromNode(node datamodel.Node, ptrValue interface{}) (interface{}, error) { | ||
| protoData := prototypeDataFor(ptrValue) | ||
| if tn, ok := node.(schema.TypedNode); ok { | ||
| node = tn.Representation() | ||
| } | ||
| builder := protoData.proto.Representation().NewBuilder() | ||
| err := builder.AssignNode(node) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| typ := bindnode.Unwrap(builder.Build()) | ||
| return typ, nil | ||
| } | ||
|
|
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| // TypeToNode converts a Go type that's provided as a pointer via the ptrValue | ||
| // argument to an schema.TypedNode. | ||
| func TypeToNode(ptrValue interface{}) schema.TypedNode { | ||
| protoData := prototypeDataFor(ptrValue) | ||
| return bindnode.Wrap(ptrValue, protoData.proto.Type(), protoData.options...) | ||
| } | ||
|
|
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| // TypeToWriter is a utility method that serializes a Go type that's provided as a | ||
| // pointer via the ptrValue argument as DAG-CBOR to a Writer | ||
| func TypeToWriter(ptrValue interface{}, w io.Writer, encoder codec.Encoder) error { | ||
| return ipld.EncodeStreaming(w, TypeToNode(ptrValue), encoder) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| package retrievalmarket | ||
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
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| "github.com/ipld/go-ipld-prime/codec/dagcbor" | ||
| "github.com/ipld/go-ipld-prime/datamodel" | ||
| "github.com/ipld/go-ipld-prime/node/basicnode" | ||
| "github.com/ipld/go-ipld-prime/node/bindnode" | ||
| "github.com/ipld/go-ipld-prime/schema" | ||
| cbg "github.com/whyrusleeping/cbor-gen" | ||
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| "github.com/filecoin-project/go-address" | ||
| "github.com/filecoin-project/go-state-types/abi" | ||
| "github.com/filecoin-project/go-state-types/big" | ||
| "github.com/filecoin-project/go-state-types/crypto" | ||
| ) | ||
|
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| // go type converter functions for bindnode for common Filecoin data types | ||
|
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| // CborGenCompatibleNodeBindnodeOption converts a CborGenCompatibleNode type to | ||
| // and from an Any field in a schema | ||
| var CborGenCompatibleNodeBindnodeOption = bindnode.TypedAnyConverter(&CborGenCompatibleNode{}, cborGenCompatibleNodeFromAny, cborGenCompatibleNodeToAny) | ||
|
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| // BigIntBindnodeOption converts a big.Int type to and from a Bytes field in a | ||
| // schema | ||
| var BigIntBindnodeOption = bindnode.TypedBytesConverter(&big.Int{}, bigIntFromBytes, bigIntToBytes) | ||
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| // TokenAmountBindnodeOption converts a filecoin abi.TokenAmount type to and | ||
| // from a Bytes field in a schema | ||
| var TokenAmountBindnodeOption = bindnode.TypedBytesConverter(&abi.TokenAmount{}, tokenAmountFromBytes, tokenAmountToBytes) | ||
|
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| // AddressBindnodeOption converts a filecoin Address type to and from a Bytes | ||
| // field in a schema | ||
| var AddressBindnodeOption = bindnode.TypedBytesConverter(&address.Address{}, addressFromBytes, addressToBytes) | ||
|
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| // SignatureBindnodeOption converts a filecoin Signature type to and from a | ||
| // Bytes field in a schema | ||
| var SignatureBindnodeOption = bindnode.TypedBytesConverter(&crypto.Signature{}, signatureFromBytes, signatureToBytes) | ||
|
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| // CborGenCompatibleNode is for cbor-gen / go-ipld-prime compatibility, to | ||
| // replace Deferred types that are used to represent datamodel.Nodes. | ||
| // This shouldn't be used as a pointer (nullable/optional) as it can consume | ||
| // "Null" tokens and therefore be a Null. Instead, use | ||
| // CborGenCompatibleNode#IsNull to check for null status. | ||
| type CborGenCompatibleNode struct { | ||
| Node datamodel.Node | ||
| } | ||
|
|
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| func (sn CborGenCompatibleNode) IsNull() bool { | ||
| return sn.Node == nil || sn.Node == datamodel.Null | ||
| } | ||
|
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| // UnmarshalCBOR is for cbor-gen compatibility | ||
| func (sn *CborGenCompatibleNode) UnmarshalCBOR(r io.Reader) error { | ||
| // use cbg.Deferred.UnmarshalCBOR to figure out how much to pull | ||
| def := cbg.Deferred{} | ||
| if err := def.UnmarshalCBOR(r); err != nil { | ||
| return err | ||
| } | ||
| // convert it to a Node | ||
| na := basicnode.Prototype.Any.NewBuilder() | ||
| if err := dagcbor.Decode(na, bytes.NewReader(def.Raw)); err != nil { | ||
| return err | ||
| } | ||
| sn.Node = na.Build() | ||
| return nil | ||
| } | ||
|
|
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| // MarshalCBOR is for cbor-gen compatibility | ||
| func (sn *CborGenCompatibleNode) MarshalCBOR(w io.Writer) error { | ||
| node := datamodel.Null | ||
| if sn != nil && sn.Node != nil { | ||
| node = sn.Node | ||
| if tn, ok := node.(schema.TypedNode); ok { | ||
| node = tn.Representation() | ||
| } | ||
| } | ||
| return dagcbor.Encode(node, w) | ||
| } | ||
|
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| func cborGenCompatibleNodeFromAny(node datamodel.Node) (interface{}, error) { | ||
| return &CborGenCompatibleNode{Node: node}, nil | ||
| } | ||
|
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| func cborGenCompatibleNodeToAny(iface interface{}) (datamodel.Node, error) { | ||
| sn, ok := iface.(*CborGenCompatibleNode) | ||
| if !ok { | ||
| return nil, fmt.Errorf("expected *CborGenCompatibleNode value") | ||
| } | ||
| if sn.Node == nil { | ||
| return datamodel.Null, nil | ||
| } | ||
| return sn.Node, nil | ||
| } | ||
|
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| func tokenAmountFromBytes(b []byte) (interface{}, error) { | ||
| return bigIntFromBytes(b) | ||
| } | ||
|
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| func bigIntFromBytes(b []byte) (interface{}, error) { | ||
| if len(b) == 0 { | ||
| return big.NewInt(0), nil | ||
| } | ||
| return big.FromBytes(b) | ||
| } | ||
|
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| func tokenAmountToBytes(iface interface{}) ([]byte, error) { | ||
| return bigIntToBytes(iface) | ||
| } | ||
|
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| func bigIntToBytes(iface interface{}) ([]byte, error) { | ||
| bi, ok := iface.(*big.Int) | ||
| if !ok { | ||
| return nil, fmt.Errorf("expected *big.Int value") | ||
| } | ||
| if bi == nil || bi.Int == nil { | ||
| *bi = big.Zero() | ||
| } | ||
| return bi.Bytes() | ||
| } | ||
|
|
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| func addressFromBytes(b []byte) (interface{}, error) { | ||
| return address.NewFromBytes(b) | ||
| } | ||
|
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| func addressToBytes(iface interface{}) ([]byte, error) { | ||
| addr, ok := iface.(*address.Address) | ||
| if !ok { | ||
| return nil, fmt.Errorf("expected *Address value") | ||
| } | ||
| return addr.Bytes(), nil | ||
| } | ||
|
|
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| // Signature is a byteprefix union | ||
| func signatureFromBytes(b []byte) (interface{}, error) { | ||
| if len(b) > crypto.SignatureMaxLength { | ||
| return nil, fmt.Errorf("string too long") | ||
| } | ||
| if len(b) == 0 { | ||
| return nil, fmt.Errorf("string empty") | ||
| } | ||
| var s crypto.Signature | ||
| switch crypto.SigType(b[0]) { | ||
| default: | ||
| return nil, fmt.Errorf("invalid signature type in cbor input: %d", b[0]) | ||
| case crypto.SigTypeSecp256k1: | ||
| s.Type = crypto.SigTypeSecp256k1 | ||
| case crypto.SigTypeBLS: | ||
| s.Type = crypto.SigTypeBLS | ||
| } | ||
| s.Data = b[1:] | ||
| return &s, nil | ||
| } | ||
|
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| func signatureToBytes(iface interface{}) ([]byte, error) { | ||
| s, ok := iface.(*crypto.Signature) | ||
| if !ok { | ||
| return nil, fmt.Errorf("expected *Signature value") | ||
| } | ||
| ba := append([]byte{byte(s.Type)}, s.Data...) | ||
| return ba, nil | ||
| } |
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