/
rpc_method.go
316 lines (265 loc) · 7.84 KB
/
rpc_method.go
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package reqresp
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/libp2p/go-libp2p-core/protocol"
"github.com/protolambda/ztyp/codec"
)
type Request interface {
fmt.Stringer
}
type Codec interface {
MinByteLen() uint64
MaxByteLen() uint64
Encode(w io.Writer, input codec.Serializable) error
Decode(r io.Reader, bytesLen uint64, dest codec.Deserializable) error
Alloc() SerDes
}
type SerDes interface {
codec.Serializable
codec.Deserializable
}
type SSZCodec struct {
alloc func() SerDes
minByteLen uint64
maxByteLen uint64
}
func NewSSZCodec(alloc func() SerDes, minByteLen uint64, maxByteLen uint64) *SSZCodec {
return &SSZCodec{
alloc: alloc,
minByteLen: minByteLen,
maxByteLen: maxByteLen,
}
}
func (c *SSZCodec) MinByteLen() uint64 {
if c == nil {
return 0
}
return c.minByteLen
}
func (c *SSZCodec) MaxByteLen() uint64 {
if c == nil {
return 0
}
return c.maxByteLen
}
func (c *SSZCodec) Encode(w io.Writer, input codec.Serializable) error {
if c == nil {
if input != nil {
return errors.New("expected empty data, nil input. This codec is no-op")
}
return nil
}
return input.Serialize(codec.NewEncodingWriter(w))
}
func (c *SSZCodec) Decode(r io.Reader, bytesLen uint64, dest codec.Deserializable) error {
if c == nil {
if bytesLen != 0 {
return errors.New("expected 0 bytes, no definition")
}
return nil
}
return dest.Deserialize(codec.NewDecodingReader(r, bytesLen))
}
func (c *SSZCodec) Alloc() SerDes {
if c == nil {
return nil
}
return c.alloc()
}
type RPCMethod struct {
Protocol protocol.ID
RequestCodec Codec
ResponseChunkCodec Codec
DefaultResponseChunkCount uint64
}
type ResponseCode uint8
const (
SuccessCode ResponseCode = 0
InvalidReqCode = 1
ServerErrCode = 2
)
// 256 bytes max error size
const MAX_ERR_SIZE = 256
type OnResponseListener func(chunk ChunkedResponseHandler) error
type RequestInput interface {
Reader(c Codec) (io.Reader, error)
}
type RequestSSZInput struct {
Obj codec.Serializable
}
func (v RequestSSZInput) Reader(c Codec) (io.Reader, error) {
var buf bytes.Buffer
if err := c.Encode(&buf, v.Obj); err != nil {
return nil, err
}
return &buf, nil
}
type RequestBytesInput []byte
func (v RequestBytesInput) Reader(_ Codec) (io.Reader, error) {
return bytes.NewReader(v), nil
}
type ChunkedResponseHandler interface {
ChunkSize() uint64
ChunkIndex() uint64
ResultCode() ResponseCode
ReadRaw() ([]byte, error)
ReadErrMsg() (string, error)
ReadObj(dest codec.Deserializable) error
}
type chRespHandler struct {
m *RPCMethod
r io.Reader
result ResponseCode
chunkSize uint64
chunkIndex uint64
}
func (c *chRespHandler) ChunkSize() uint64 {
return c.chunkSize
}
func (c *chRespHandler) ChunkIndex() uint64 {
return c.chunkIndex
}
func (c *chRespHandler) ResultCode() ResponseCode {
return c.result
}
func (c *chRespHandler) ReadRaw() ([]byte, error) {
var buf bytes.Buffer
_, err := buf.ReadFrom(io.LimitReader(c.r, int64(c.chunkSize)))
return buf.Bytes(), err
}
func (c *chRespHandler) ReadErrMsg() (string, error) {
var buf bytes.Buffer
_, err := buf.ReadFrom(io.LimitReader(c.r, int64(c.chunkSize)))
return string(buf.Bytes()), err
}
func (c *chRespHandler) ReadObj(dest codec.Deserializable) error {
return c.m.ResponseChunkCodec.Decode(c.r, c.chunkSize, dest)
}
func (m *RPCMethod) RunRequest(ctx context.Context, newStreamFn NewStreamFn,
peerId peer.ID, comp Compression, req RequestInput, maxRespChunks uint64, madeRequest func() error,
onResponse OnResponseListener) error {
handleChunks := ResponseChunkHandler(func(ctx context.Context, chunkIndex uint64, chunkSize uint64, result ResponseCode, r io.Reader, w io.Writer) error {
return onResponse(&chRespHandler{
m: m,
r: r,
result: result,
chunkSize: chunkSize,
chunkIndex: chunkIndex,
})
})
reqR, err := req.Reader(m.RequestCodec)
if err != nil {
return err
}
protocolId := m.Protocol
maxChunkContentSize := m.ResponseChunkCodec.MaxByteLen()
if comp != nil {
protocolId += protocol.ID("_" + comp.Name())
if s, err := comp.MaxEncodedLen(maxChunkContentSize); err != nil {
return err
} else {
maxChunkContentSize = s
}
}
respHandler := handleChunks.MakeResponseHandler(maxRespChunks, maxChunkContentSize, comp)
handler := ResponseHandler(func(ctx context.Context, r io.Reader, w io.WriteCloser) error {
if err := madeRequest(); err != nil {
return fmt.Errorf("made request, but could not continue: %v", err)
}
return respHandler(ctx, r, w)
})
// Runs the request in sync, which processes responses,
// and then finally closes the channel through the earlier deferred close.
return newStreamFn.Request(ctx, peerId, protocolId, reqR, comp, handler)
}
type ReadRequestFn func(dest interface{}) error
type WriteSuccessChunkFn func(data interface{}) error
type WriteMsgFn func(msg string) error
type RequestReader interface {
// nil if not an invalid input
InvalidInput() error
ReadRequest(dest codec.Deserializable) error
RawRequest() ([]byte, error)
}
type RequestResponder interface {
WriteResponseChunk(code ResponseCode, data codec.Serializable) error
WriteRawResponseChunk(code ResponseCode, chunk []byte) error
StreamResponseChunk(code ResponseCode, size uint64, r io.Reader) error
WriteErrorChunk(code ResponseCode, msg string) error
}
type ChunkedRequestHandler interface {
RequestReader
RequestResponder
}
type chReqHandler struct {
m *RPCMethod
comp Compression
respBuf bytes.Buffer
reqLen uint64
r io.Reader
w io.Writer
invalidInputErr error
}
func (h *chReqHandler) InvalidInput() error {
return h.invalidInputErr
}
func (h *chReqHandler) ReadRequest(dest codec.Deserializable) error {
if h.invalidInputErr != nil {
return h.invalidInputErr
}
r := h.r
if h.comp != nil {
r = h.comp.Decompress(r)
}
return h.m.RequestCodec.Decode(r, h.reqLen, dest)
}
func (h *chReqHandler) RawRequest() ([]byte, error) {
if h.invalidInputErr != nil {
return nil, h.invalidInputErr
}
var buf bytes.Buffer
r := h.r
if h.comp != nil {
r = h.comp.Decompress(r)
}
if _, err := buf.ReadFrom(io.LimitReader(r, int64(h.reqLen))); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (h *chReqHandler) WriteResponseChunk(code ResponseCode, data codec.Serializable) error {
h.respBuf.Reset() // re-use buffer for each response chunk
if err := h.m.ResponseChunkCodec.Encode(&h.respBuf, data); err != nil {
return err
}
b := h.respBuf.Bytes()
return StreamChunk(code, uint64(len(b)), bytes.NewReader(b), h.w, h.comp)
}
func (h *chReqHandler) WriteRawResponseChunk(code ResponseCode, chunk []byte) error {
return StreamChunk(code, uint64(len(chunk)), bytes.NewReader(chunk), h.w, h.comp)
}
func (h *chReqHandler) StreamResponseChunk(code ResponseCode, size uint64, r io.Reader) error {
return StreamChunk(code, size, r, h.w, h.comp)
}
func (h *chReqHandler) WriteErrorChunk(code ResponseCode, msg string) error {
if len(msg) > MAX_ERR_SIZE {
msg = msg[:MAX_ERR_SIZE-3]
msg += "..."
}
b := []byte(msg)
return StreamChunk(code, uint64(len(b)), bytes.NewReader(b), h.w, h.comp)
}
type OnRequestListener func(ctx context.Context, peerId peer.ID, handler ChunkedRequestHandler)
func (m *RPCMethod) MakeStreamHandler(newCtx StreamCtxFn, comp Compression, listener OnRequestListener) network.StreamHandler {
return RequestPayloadHandler(func(ctx context.Context, peerId peer.ID, requestLen uint64, r io.Reader, w io.Writer, comp Compression, invalidInputErr error) {
listener(ctx, peerId, &chReqHandler{
m: m, comp: comp, reqLen: requestLen, r: r, w: w, invalidInputErr: invalidInputErr,
})
}).MakeStreamHandler(newCtx, comp, m.RequestCodec.MinByteLen(), m.RequestCodec.MaxByteLen())
}