<|start_filename|>pkg/rpc/codec.go<|end_filename|>
package rpc

import (
	"bytes"
	"encoding/gob"
	"io"
	"net/rpc"
	"sync"

	json "github.com/json-iterator/go"
	"github.com/spiral/errors"
	"github.com/spiral/goridge/v3/pkg/frame"
	"github.com/spiral/goridge/v3/pkg/relay"
	"github.com/spiral/goridge/v3/pkg/socket"
	"github.com/vmihailenco/msgpack/v5"
	"google.golang.org/protobuf/proto"
)

// Codec represent net/rpc bridge over Goridge socket relay.
type Codec struct {
	relay  relay.Relay
	closed bool
	frame  *frame.Frame
	codec  sync.Map

	bPool sync.Pool
	fPool sync.Pool
}

// NewCodec initiates new server rpc codec over socket connection.
func NewCodec(rwc io.ReadWriteCloser) *Codec {
	return &Codec{
		relay: socket.NewSocketRelay(rwc),
		codec: sync.Map{},

		bPool: sync.Pool{New: func() interface{} {
			return new(bytes.Buffer)
		}},

		fPool: sync.Pool{New: func() interface{} {
			return frame.NewFrame()
		}},
	}
}

// NewCodecWithRelay initiates new server rpc codec with a relay of choice.
func NewCodecWithRelay(relay relay.Relay) *Codec {
	return &Codec{relay: relay}
}

func (c *Codec) get() *bytes.Buffer {
	return c.bPool.Get().(*bytes.Buffer)
}

func (c *Codec) put(b *bytes.Buffer) {
	b.Reset()
	c.bPool.Put(b)
}

func (c *Codec) getFrame() *frame.Frame {
	return c.fPool.Get().(*frame.Frame)
}

func (c *Codec) putFrame(f *frame.Frame) {
	f.Reset()
	c.fPool.Put(f)
}

// WriteResponse marshals response, byte slice or error to remote party.
func (c *Codec) WriteResponse(r *rpc.Response, body interface{}) error { //nolint:funlen
	const op = errors.Op("goridge_write_response")
	fr := c.getFrame()
	defer c.putFrame(fr)

	// SEQ_ID + METHOD_NAME_LEN
	fr.WriteOptions(fr.HeaderPtr(), uint32(r.Seq), uint32(len(r.ServiceMethod)))
	// Write protocol version
	fr.WriteVersion(fr.Header(), frame.VERSION_1)

	// load and delete associated codec to not waste memory
	// because we write it to the fr and don't need more information about it
	codec, ok := c.codec.LoadAndDelete(r.Seq)
	if !ok {
		// fallback codec
		fr.WriteFlags(fr.Header(), frame.CODEC_GOB)
	} else {
		fr.WriteFlags(fr.Header(), codec.(byte))
	}

	// if error returned, we sending it via relay and return error from WriteResponse
	if r.Error != "" {
		// Append error flag
		return c.handleError(r, fr, r.Error)
	}

	switch {
	case codec.(byte)&frame.CODEC_PROTO != 0:
		d, err := proto.Marshal(body.(proto.Message))
		if err != nil {
			return c.handleError(r, fr, err.Error())
		}

		// initialize buffer
		buf := c.get()
		defer c.put(buf)

		buf.Grow(len(d) + len(r.ServiceMethod))
		// writeServiceMethod to the buffer
		buf.WriteString(r.ServiceMethod)
		buf.Write(d)

		fr.WritePayloadLen(fr.Header(), uint32(buf.Len()))
		// copy inside
		fr.WritePayload(buf.Bytes())
		fr.WriteCRC(fr.Header())
		// send buffer
		return c.relay.Send(fr)
	case codec.(byte)&frame.CODEC_RAW != 0:
		// initialize buffer
		buf := c.get()
		defer c.put(buf)

		switch data := body.(type) {
		case []byte:
			buf.Grow(len(data) + len(r.ServiceMethod))
			// writeServiceMethod to the buffer
			buf.WriteString(r.ServiceMethod)
			buf.Write(data)

			c.frame.WritePayloadLen(c.frame.Header(), uint32(buf.Len()))
			c.frame.WritePayload(buf.Bytes())
		case *[]byte:
			buf.Grow(len(*data) + len(r.ServiceMethod))
			// writeServiceMethod to the buffer
			buf.WriteString(r.ServiceMethod)
			buf.Write(*data)

			c.frame.WritePayloadLen(c.frame.Header(), uint32(buf.Len()))
			c.frame.WritePayload(buf.Bytes())
		default:
			return c.handleError(r, fr, "unknown Raw payload type")
		}

		// send buffer
		c.frame.WriteCRC(c.frame.Header())
		return c.relay.Send(c.frame)

	case codec.(byte)&frame.CODEC_JSON != 0:
		data, err := json.Marshal(body)
		if err != nil {
			return c.handleError(r, fr, err.Error())
		}

		// initialize buffer
		buf := c.get()
		defer c.put(buf)

		buf.Grow(len(data) + len(r.ServiceMethod))
		// writeServiceMethod to the buffer
		buf.WriteString(r.ServiceMethod)
		buf.Write(data)

		fr.WritePayloadLen(fr.Header(), uint32(buf.Len()))
		// copy inside
		fr.WritePayload(buf.Bytes())
		fr.WriteCRC(fr.Header())
		// send buffer
		return c.relay.Send(fr)

	case codec.(byte)&frame.CODEC_MSGPACK != 0:
		b, err := msgpack.Marshal(body)
		if err != nil {
			return errors.E(op, err)
		}
		// initialize buffer
		buf := c.get()
		defer c.put(buf)

		buf.Grow(len(b) + len(r.ServiceMethod))
		// writeServiceMethod to the buffer
		buf.WriteString(r.ServiceMethod)
		buf.Write(b)

		fr.WritePayloadLen(fr.Header(), uint32(buf.Len()))
		// copy inside
		fr.WritePayload(buf.Bytes())
		fr.WriteCRC(fr.Header())
		// send buffer
		return c.relay.Send(fr)

	case codec.(byte)&frame.CODEC_GOB != 0:
		// initialize buffer
		buf := c.get()
		defer c.put(buf)

		buf.WriteString(r.ServiceMethod)

		dec := gob.NewEncoder(buf)
		err := dec.Encode(body)
		if err != nil {
			return errors.E(op, err)
		}

		fr.WritePayloadLen(fr.Header(), uint32(buf.Len()))
		// copy inside
		fr.WritePayload(buf.Bytes())
		fr.WriteCRC(fr.Header())
		// send buffer
		return c.relay.Send(fr)
	default:
		return c.handleError(r, fr, errors.E(op, errors.Str("unknown codec")).Error())
	}
}

func (c *Codec) handleError(r *rpc.Response, fr *frame.Frame, err string) error {
	buf := c.get()
	defer c.put(buf)

	// write all possible errors
	buf.WriteString(r.ServiceMethod)

	const op = errors.Op("handle codec error")
	fr.WriteFlags(fr.Header(), frame.ERROR)
	// error should be here
	if err != "" {
		buf.WriteString(err)
	}
	fr.WritePayloadLen(fr.Header(), uint32(buf.Len()))
	fr.WritePayload(buf.Bytes())

	fr.WriteCRC(fr.Header())
	_ = c.relay.Send(fr)
	return errors.E(op, errors.Str(r.Error))
}

// ReadRequestHeader receives frame with options
// options should have 2 values
// [0] - integer, sequence ID
// [1] - integer, offset for method name
// For example:
// 15Test.Payload
// SEQ_ID: 15
// METHOD_LEN: 12 and we take 12 bytes from the payload as method name
func (c *Codec) ReadRequestHeader(r *rpc.Request) error {
	const op = errors.Op("goridge_read_request_header")
	f := c.getFrame()

	err := c.relay.Receive(f)
	if err != nil {
		return err
	}

	// opts[0] sequence ID
	// opts[1] service method name offset from payload in bytes
	opts := f.ReadOptions(f.Header())
	if len(opts) != 2 {
		return errors.E(op, errors.Str("should be 2 options. SEQ_ID and METHOD_LEN"))
	}

	r.Seq = uint64(opts[0])
	r.ServiceMethod = string(f.Payload()[:opts[1]])
	c.frame = f
	return c.storeCodec(r, f.ReadFlags())
}

func (c *Codec) storeCodec(r *rpc.Request, flag byte) error {
	switch {
	case flag&frame.CODEC_PROTO != 0:
		c.codec.Store(r.Seq, frame.CODEC_PROTO)
	case flag&frame.CODEC_JSON != 0:
		c.codec.Store(r.Seq, frame.CODEC_JSON)
	case flag&frame.CODEC_RAW != 0:
		c.codec.Store(r.Seq, frame.CODEC_RAW)
	case flag&frame.CODEC_MSGPACK != 0:
		c.codec.Store(r.Seq, frame.CODEC_MSGPACK)
	case flag&frame.CODEC_GOB != 0:
		c.codec.Store(r.Seq, frame.CODEC_GOB)
	default:
		c.codec.Store(r.Seq, frame.CODEC_GOB)
	}

	return nil
}

// ReadRequestBody fetches prefixed body data and automatically unmarshal it as json. RawBody flag will populate
// []byte lice argument for rpc method.
func (c *Codec) ReadRequestBody(out interface{}) error {
	const op = errors.Op("goridge_read_request_body")
	if out == nil {
		return nil
	}

	defer c.putFrame(c.frame)

	flags := c.frame.ReadFlags()

	switch { //nolint:dupl
	case flags&frame.CODEC_PROTO != 0:
		opts := c.frame.ReadOptions(c.frame.Header())
		if len(opts) != 2 {
			return errors.E(op, errors.Str("should be 2 options. SEQ_ID and METHOD_LEN"))
		}
		payload := c.frame.Payload()[opts[1]:]
		if len(payload) == 0 {
			return nil
		}

		// check if the out message is a correct proto.Message
		// instead send an error
		if pOut, ok := out.(proto.Message); ok {
			err := proto.Unmarshal(payload, pOut)
			if err != nil {
				return errors.E(op, err)
			}
			return nil
		}

		return errors.E(op, errors.Str("message type is not a proto"))
	case flags&frame.CODEC_JSON != 0:
		opts := c.frame.ReadOptions(c.frame.Header())
		if len(opts) != 2 {
			return errors.E(op, errors.Str("should be 2 options. SEQ_ID and METHOD_LEN"))
		}
		payload := c.frame.Payload()[opts[1]:]
		if len(payload) == 0 {
			return nil
		}
		return json.Unmarshal(payload, out)
	case flags&frame.CODEC_GOB != 0:
		opts := c.frame.ReadOptions(c.frame.Header())
		if len(opts) != 2 {
			return errors.E(op, errors.Str("should be 2 options. SEQ_ID and METHOD_LEN"))
		}
		payload := c.frame.Payload()[opts[1]:]
		if len(payload) == 0 {
			return nil
		}

		buf := c.get()
		defer c.put(buf)

		dec := gob.NewDecoder(buf)
		buf.Write(payload)

		err := dec.Decode(out)
		if err != nil {
			return errors.E(op, err)
		}

		return nil
	case flags&frame.CODEC_RAW != 0:
		opts := c.frame.ReadOptions(c.frame.Header())
		if len(opts) != 2 {
			return errors.E(op, errors.Str("should be 2 options. SEQ_ID and METHOD_LEN"))
		}
		payload := c.frame.Payload()[opts[1]:]
		if len(payload) == 0 {
			return nil
		}

		if raw, ok := out.(*[]byte); ok {
			*raw = append(*raw, payload...)
		}

		return nil
	case flags&frame.CODEC_MSGPACK != 0:
		opts := c.frame.ReadOptions(c.frame.Header())
		if len(opts) != 2 {
			return errors.E(op, errors.Str("should be 2 options. SEQ_ID and METHOD_LEN"))
		}
		payload := c.frame.Payload()[opts[1]:]
		if len(payload) == 0 {
			return nil
		}

		return msgpack.Unmarshal(payload, out)
	default:
		return errors.E(op, errors.Str("unknown decoder used in frame"))
	}
}

// Close underlying socket.
func (c *Codec) Close() error {
	if c.closed {
		return nil
	}

	c.closed = true
	return c.relay.Close()
}


<|start_filename|>pkg/socket/socket.go<|end_filename|>
package socket

import (
	"io"

	"github.com/spiral/errors"
	"github.com/spiral/goridge/v3/internal"
	"github.com/spiral/goridge/v3/pkg/frame"
)

// Relay communicates with underlying process using sockets (TPC or Unix).
type Relay struct {
	rwc io.ReadWriteCloser
}

// NewSocketRelay creates new socket based data relay.
func NewSocketRelay(rwc io.ReadWriteCloser) *Relay {
	internal.Preallocate()
	return &Relay{rwc: rwc}
}

// Send signed (prefixed) data to PHP process.
func (rl *Relay) Send(frame *frame.Frame) error {
	const op = errors.Op("pipes frame send")
	_, err := rl.rwc.Write(frame.Bytes())
	if err != nil {
		return errors.E(op, err)
	}
	return nil
}

// Receive data from the underlying process and returns associated prefix or error.
func (rl *Relay) Receive(frame *frame.Frame) error {
	if frame == nil {
		return errors.Str("nil frame")
	}
	return internal.ReceiveFrame(rl.rwc, frame)
}

// Close the connection.
func (rl *Relay) Close() error {
	return rl.rwc.Close()
}


<|start_filename|>benchmarks/main.go<|end_filename|>
package main

import (
	"context"
	"net"
	"net/http"
	"net/http/pprof"
	"net/rpc"
	"time"

	goridgeRpc "github.com/spiral/goridge/v3/pkg/rpc"
	"github.com/spiral/goridge/v3/test"
)

func main() {
	s := NewServer()
	go func() {
		_ = s.Start("localhost:6061")
	}()
	defer func() {
		_ = s.Stop(context.Background())
	}()

	time.Sleep(time.Second * 5)
	// create an pprof server
	server()
	time.Sleep(time.Second * 1)

	client()
}

// testService sample
type testService struct{}

func (s *testService) ProtoMessage(payload *test.Payload, item *test.Item) error {
	(*item).Key = payload.Items[0].Key
	return nil
}

func client() {
	err := rpc.RegisterName("testbench", new(testService))
	if err != nil {
		panic(err)
	}

	conn, err := net.Dial("tcp", "127.0.0.1:18321")
	if err != nil {
		panic(err)
	}

	client := rpc.NewClientWithCodec(goridgeRpc.NewClientCodec(conn))
	defer func() {
		err := client.Close()
		if err != nil {
			panic(err)
		}
	}()

	tt := time.Now().String()

	keysP := &test.Payload{
		Storage: "memory-rr",
		Items: []*test.Item{
			{
				Key:     "a",
				Value:   "hhhhhhhhhhhhhhhhheeeeeeeeeeeeeeeeeeeeeeeeeeeelllllllllllllllllllllllllllllllllloooooooooooooooooooooooooooooo",
				Timeout: tt,
			},
			{
				Key:     "b",
				Value:   "hhhhhhhhhhhhhhhhheeeeeeeeeeeeeeeeeeeeeeeeeeeelllllllllllllllllllllllllllllllllloooooooooooooooooooooooooooooo",
				Timeout: tt,
			},
			{
				Key:     "c",
				Value:   "hhhhhhhhhhhhhhhhheeeeeeeeeeeeeeeeeeeeeeeeeeeelllllllllllllllllllllllllllllllllloooooooooooooooooooooooooooooo",
				Timeout: tt,
			},
		},
	}

	item := &test.Item{}
	for i := 0; i < 1000000; i++ {
		err = client.Call("testbench.ProtoMessage", keysP, item)
		if err != nil {
			panic(err)
		}
	}
}

func server() {
	ln, err := net.Listen("tcp", "127.0.0.1:18321")
	if err != nil {
		panic(err)
	}

	go func() {
		for {
			conn, err2 := ln.Accept()
			if err2 != nil {
				panic(err2)
			}
			rpc.ServeCodec(goridgeRpc.NewCodec(conn))
		}
	}()
}

// Server is a HTTP server for debugging.
type Server struct {
	srv *http.Server
}

// NewServer creates new HTTP server for debugging.
func NewServer() Server {
	mux := http.NewServeMux()

	mux.HandleFunc("/debug/pprof/", pprof.Index)
	mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
	mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
	mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
	mux.HandleFunc("/debug/pprof/trace", pprof.Trace)

	return Server{srv: &http.Server{Handler: mux}}
}

// Start debug server.
func (s *Server) Start(addr string) error {
	s.srv.Addr = addr

	return s.srv.ListenAndServe()
}

// Stop debug server.
func (s *Server) Stop(ctx context.Context) error {
	return s.srv.Shutdown(ctx)
}


<|start_filename|>pkg/frame/frame_flags.go<|end_filename|>
package frame

// BYTE flags, it means, that we can set multiply flags from this group using bitwise OR
// For example CONTEXT_SEPARATOR | CODEC_RAW
const (
	CONTROL       byte = 0x01
	CODEC_RAW     byte = 0x04 //nolint:stylecheck,golint
	CODEC_JSON    byte = 0x08 //nolint:stylecheck,golint
	CODEC_MSGPACK byte = 0x10 //nolint:stylecheck,golint
	CODEC_GOB     byte = 0x20 //nolint:stylecheck,golint
	ERROR         byte = 0x40 //nolint:stylecheck,golint
	CODEC_PROTO   byte = 0x80 //nolint:stylecheck,golint
)

// COMPLEX flags can't be used with Byte flags, because it's value more than 128
const (
	RESERVED2 byte = 0x81
	RESERVED3 byte = 0x82
	RESERVED4 byte = 0x83
	RESERVED5 byte = 0x84
)

type Version byte

const (
	VERSION_1 Version = 0x01 //nolint:stylecheck,golint
)


<|start_filename|>pkg/pipe/pipe.go<|end_filename|>
package pipe

import (
	"io"

	"github.com/spiral/errors"
	"github.com/spiral/goridge/v3/internal"
	"github.com/spiral/goridge/v3/pkg/frame"
)

// Relay ... PipeRelay communicate with underlying process using standard streams (STDIN, STDOUT). Attention, use TCP alternative for
// Windows as more reliable option. This relay closes automatically with the process.
type Relay struct {
	in  io.ReadCloser
	out io.WriteCloser
}

// NewPipeRelay creates new pipe based data relay.
func NewPipeRelay(in io.ReadCloser, out io.WriteCloser) *Relay {
	internal.Preallocate()
	return &Relay{in: in, out: out}
}

// Send signed (prefixed) data to underlying process.
func (rl *Relay) Send(frame *frame.Frame) error {
	const op = errors.Op("pipes frame send")
	_, err := rl.out.Write(frame.Bytes())
	if err != nil {
		return errors.E(op, err)
	}
	return nil
}

func (rl *Relay) Receive(frame *frame.Frame) error {
	if frame == nil {
		return errors.Str("nil frame")
	}
	return internal.ReceiveFrame(rl.in, frame)
}

// Close the connection. Pipes are closed automatically with the underlying process.
func (rl *Relay) Close() error {
	return nil
}


<|start_filename|>pkg/socket/socket_test.go<|end_filename|>
package socket

import (
	"net"
	"testing"

	"github.com/spiral/goridge/v3/pkg/frame"
	"github.com/stretchr/testify/assert"
)

const TestPayload = `alsdjf;lskjdgljasg;lkjsalfkjaskldjflkasjdf;lkasjfdalksdjflkajsdf;lfasdgnslsnblna;sldjjfawlkejr;lwjenlksndlfjawl;ejr;lwjelkrjaldfjl;sdjf`

func TestSocketRelay(t *testing.T) {
	// configure and create tcp4 listener
	ls, err := net.Listen("tcp", "localhost:10002")
	assert.NoError(t, err)

	// TEST FRAME TO SEND
	nf := frame.NewFrame()
	nf.WriteVersion(nf.Header(), frame.VERSION_1)
	nf.WriteFlags(nf.Header(), frame.CONTROL, frame.CODEC_GOB, frame.CODEC_JSON)
	nf.WritePayloadLen(nf.Header(), uint32(len([]byte(TestPayload))))
	nf.WritePayload([]byte(TestPayload))
	nf.WriteCRC(nf.Header())
	assert.Equal(t, true, nf.VerifyCRC(nf.Header()))

	conn, err := net.Dial("tcp", "localhost:10002")
	assert.NoError(t, err)
	rsend := NewSocketRelay(conn)
	err = rsend.Send(nf)
	assert.NoError(t, err)

	accept, err := ls.Accept()
	assert.NoError(t, err)
	assert.NotNil(t, accept)

	r := NewSocketRelay(accept)

	fr := frame.NewFrame()
	err = r.Receive(fr)
	if err != nil {
		t.Fatal(err)
	}

	assert.Equal(t, fr.ReadVersion(fr.Header()), nf.ReadVersion(nf.Header()))
	assert.Equal(t, fr.ReadFlags(), nf.ReadFlags())
	assert.Equal(t, fr.ReadPayloadLen(fr.Header()), nf.ReadPayloadLen(nf.Header()))
	assert.Equal(t, true, fr.VerifyCRC(fr.Header()))
	assert.Equal(t, []byte(TestPayload), fr.Payload())
}

func TestSocketRelayOptions(t *testing.T) {
	// configure and create tcp4 listener
	ls, err := net.Listen("tcp", "localhost:10001")
	assert.NoError(t, err)

	// TEST FRAME TO SEND
	nf := frame.NewFrame()
	nf.WriteVersion(nf.Header(), frame.VERSION_1)
	nf.WriteFlags(nf.Header(), frame.CONTROL, frame.CODEC_GOB, frame.CODEC_JSON)
	nf.WritePayloadLen(nf.Header(), uint32(len([]byte(TestPayload))))
	nf.WritePayload([]byte(TestPayload))
	nf.WriteOptions(nf.HeaderPtr(), 100, 10000, 100000)
	nf.WriteCRC(nf.Header())
	assert.Equal(t, true, nf.VerifyCRC(nf.Header()))

	conn, err := net.Dial("tcp", "localhost:10001")
	assert.NoError(t, err)
	rsend := NewSocketRelay(conn)
	err = rsend.Send(nf)
	assert.NoError(t, err)

	accept, err := ls.Accept()
	assert.NoError(t, err)
	assert.NotNil(t, accept)

	r := NewSocketRelay(accept)

	fr := frame.NewFrame()
	err = r.Receive(fr)
	if err != nil {
		t.Fatal(err)
	}

	assert.Equal(t, fr.ReadVersion(fr.Header()), nf.ReadVersion(nf.Header()))
	assert.Equal(t, fr.ReadFlags(), nf.ReadFlags())
	assert.Equal(t, fr.ReadPayloadLen(fr.Header()), nf.ReadPayloadLen(nf.Header()))
	assert.Equal(t, true, fr.VerifyCRC(fr.Header()))
	assert.Equal(t, []byte(TestPayload), fr.Payload())
	assert.Equal(t, []uint32{100, 10000, 100000}, fr.ReadOptions(fr.Header()))
}

func TestSocketRelayNoPayload(t *testing.T) {
	// configure and create tcp4 listener
	ls, err := net.Listen("tcp", "localhost:12221")
	assert.NoError(t, err)

	// TEST FRAME TO SEND
	nf := frame.NewFrame()
	nf.WriteVersion(nf.Header(), frame.VERSION_1)
	nf.WriteFlags(nf.Header(), frame.CONTROL, frame.CODEC_GOB, frame.CODEC_JSON)
	nf.WriteOptions(nf.HeaderPtr(), 100, 10000, 100000)
	nf.WriteCRC(nf.Header())
	assert.Equal(t, true, nf.VerifyCRC(nf.Header()))

	conn, err := net.Dial("tcp", "localhost:12221")
	assert.NoError(t, err)
	rsend := NewSocketRelay(conn)
	err = rsend.Send(nf)
	assert.NoError(t, err)

	accept, err := ls.Accept()
	assert.NoError(t, err)
	assert.NotNil(t, accept)

	r := NewSocketRelay(accept)

	fr := frame.NewFrame()
	err = r.Receive(fr)
	if err != nil {
		t.Fatal(err)
	}

	assert.Equal(t, fr.ReadVersion(fr.Header()), nf.ReadVersion(nf.Header()))
	assert.Equal(t, fr.ReadFlags(), nf.ReadFlags())
	assert.Equal(t, fr.ReadPayloadLen(fr.Header()), nf.ReadPayloadLen(nf.Header()))
	assert.Equal(t, true, fr.VerifyCRC(fr.Header()))
	assert.Equal(t, []byte{}, fr.Payload()) // empty
	assert.Equal(t, []uint32{100, 10000, 100000}, fr.ReadOptions(fr.Header()))
}

func TestSocketRelayWrongCRC(t *testing.T) {
	// configure and create tcp4 listener
	ls, err := net.Listen("tcp", "localhost:13445")
	assert.NoError(t, err)

	// TEST FRAME TO SEND
	nf := frame.NewFrame()
	nf.WriteVersion(nf.Header(), frame.VERSION_1)
	nf.WriteFlags(nf.Header(), frame.CONTROL, frame.CODEC_GOB, frame.CODEC_JSON)
	nf.WriteOptions(nf.HeaderPtr(), 100, 10000, 100000)
	nf.WriteCRC(nf.Header())
	nf.Header()[6] = 22 // just random wrong CRC directly

	conn, err := net.Dial("tcp", "localhost:13445")
	assert.NoError(t, err)
	_, err = conn.Write(nf.Bytes())
	assert.NoError(t, err)

	accept, err := ls.Accept()
	assert.NoError(t, err)
	assert.NotNil(t, accept)

	r := NewSocketRelay(accept)

	fr := frame.NewFrame()
	err = r.Receive(fr)
	assert.Error(t, err)
	assert.False(t, fr.VerifyCRC(fr.Header()))

	assert.Empty(t, fr.Payload())
}


<|start_filename|>internal/receive.go<|end_filename|>
package internal

import (
	"bytes"
	"io"

	"github.com/spiral/errors"
	"github.com/spiral/goridge/v3/pkg/frame"
)

// shortland for the Could not open input file: ../roadrunner/tests/psr-wfsdorker.php
var res = []byte("Could not op") //nolint:gochecknoglobals

func ReceiveFrame(relay io.Reader, fr *frame.Frame) error {
	const op = errors.Op("goridge_frame_receive")

	_, err := io.ReadFull(relay, fr.Header())
	if err != nil {
		return errors.E(op, err)
	}

	if bytes.Equal(fr.Header(), res) {
		data, errRa := io.ReadAll(relay)
		if errRa == nil && len(data) > 0 {
			return errors.E(op, errors.FileNotFound, errors.Str(string(fr.Header())+string(data)))
		}

		return errors.E(op, errors.FileNotFound, errors.Str("file not found"))
	}

	// we have options
	if fr.ReadHL(fr.Header()) > 3 {
		// we should read the options
		optsLen := (fr.ReadHL(fr.Header()) - 3) * frame.WORD
		opts := make([]byte, optsLen)

		// read next part of the frame - options
		_, err = io.ReadFull(relay, opts)
		if err != nil {
			return errors.E(op, err)
		}

		// we should append frame's
		fr.AppendOptions(fr.HeaderPtr(), opts)
	}

	// verify header CRC
	if !fr.VerifyCRC(fr.Header()) {
		return errors.E(op, errors.Str("CRC verification failed"))
	}

	// read the read payload
	pl := fr.ReadPayloadLen(fr.Header())
	// no payload
	if pl == 0 {
		return nil
	}

	pb := get(pl)
	_, err = io.ReadFull(relay, (*pb)[:pl])
	if err != nil {
		put(pl, pb)
		return errors.E(op, err)
	}

	fr.WritePayload((*pb)[:pl])
	put(pl, pb)
	return nil
}
