forked from bnb-chain/bsc
/
types.go
359 lines (306 loc) · 10 KB
/
types.go
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// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package ethtest
import (
"crypto/ecdsa"
"fmt"
"reflect"
"time"
"github.com/demindsmr/bsc/core/types"
"github.com/demindsmr/bsc/crypto"
"github.com/demindsmr/bsc/eth/protocols/eth"
"github.com/demindsmr/bsc/internal/utesting"
"github.com/demindsmr/bsc/p2p"
"github.com/demindsmr/bsc/p2p/rlpx"
"github.com/demindsmr/bsc/rlp"
)
type Message interface {
Code() int
}
type Error struct {
err error
}
func (e *Error) Unwrap() error { return e.err }
func (e *Error) Error() string { return e.err.Error() }
func (e *Error) Code() int { return -1 }
func (e *Error) String() string { return e.Error() }
func errorf(format string, args ...interface{}) *Error {
return &Error{fmt.Errorf(format, args...)}
}
// Hello is the RLP structure of the protocol handshake.
type Hello struct {
Version uint64
Name string
Caps []p2p.Cap
ListenPort uint64
ID []byte // secp256k1 public key
// Ignore additional fields (for forward compatibility).
Rest []rlp.RawValue `rlp:"tail"`
}
func (h Hello) Code() int { return 0x00 }
// Disconnect is the RLP structure for a disconnect message.
type Disconnect struct {
Reason p2p.DiscReason
}
func (d Disconnect) Code() int { return 0x01 }
type Ping struct{}
func (p Ping) Code() int { return 0x02 }
type Pong struct{}
func (p Pong) Code() int { return 0x03 }
// Status is the network packet for the status message for eth/64 and later.
type Status eth.StatusPacket
func (s Status) Code() int { return 16 }
// NewBlockHashes is the network packet for the block announcements.
type NewBlockHashes eth.NewBlockHashesPacket
func (nbh NewBlockHashes) Code() int { return 17 }
type Transactions eth.TransactionsPacket
func (t Transactions) Code() int { return 18 }
// GetBlockHeaders represents a block header query.
type GetBlockHeaders eth.GetBlockHeadersPacket
func (g GetBlockHeaders) Code() int { return 19 }
type BlockHeaders eth.BlockHeadersPacket
func (bh BlockHeaders) Code() int { return 20 }
// GetBlockBodies represents a GetBlockBodies request
type GetBlockBodies eth.GetBlockBodiesPacket
func (gbb GetBlockBodies) Code() int { return 21 }
// BlockBodies is the network packet for block content distribution.
type BlockBodies eth.BlockBodiesPacket
func (bb BlockBodies) Code() int { return 22 }
// NewBlock is the network packet for the block propagation message.
type NewBlock eth.NewBlockPacket
func (nb NewBlock) Code() int { return 23 }
// NewPooledTransactionHashes is the network packet for the tx hash propagation message.
type NewPooledTransactionHashes eth.NewPooledTransactionHashesPacket
func (nb NewPooledTransactionHashes) Code() int { return 24 }
type GetPooledTransactions eth.GetPooledTransactionsPacket
func (gpt GetPooledTransactions) Code() int { return 25 }
type PooledTransactions eth.PooledTransactionsPacket
func (pt PooledTransactions) Code() int { return 26 }
// Conn represents an individual connection with a peer
type Conn struct {
*rlpx.Conn
ourKey *ecdsa.PrivateKey
negotiatedProtoVersion uint
ourHighestProtoVersion uint
caps []p2p.Cap
}
func (c *Conn) Read() Message {
code, rawData, _, err := c.Conn.Read()
if err != nil {
return errorf("could not read from connection: %v", err)
}
var msg Message
switch int(code) {
case (Hello{}).Code():
msg = new(Hello)
case (Ping{}).Code():
msg = new(Ping)
case (Pong{}).Code():
msg = new(Pong)
case (Disconnect{}).Code():
msg = new(Disconnect)
case (Status{}).Code():
msg = new(Status)
case (GetBlockHeaders{}).Code():
msg = new(GetBlockHeaders)
case (BlockHeaders{}).Code():
msg = new(BlockHeaders)
case (GetBlockBodies{}).Code():
msg = new(GetBlockBodies)
case (BlockBodies{}).Code():
msg = new(BlockBodies)
case (NewBlock{}).Code():
msg = new(NewBlock)
case (NewBlockHashes{}).Code():
msg = new(NewBlockHashes)
case (Transactions{}).Code():
msg = new(Transactions)
case (NewPooledTransactionHashes{}).Code():
msg = new(NewPooledTransactionHashes)
case (GetPooledTransactions{}.Code()):
msg = new(GetPooledTransactions)
case (PooledTransactions{}.Code()):
msg = new(PooledTransactions)
default:
return errorf("invalid message code: %d", code)
}
// if message is devp2p, decode here
if err := rlp.DecodeBytes(rawData, msg); err != nil {
return errorf("could not rlp decode message: %v", err)
}
return msg
}
// ReadAndServe serves GetBlockHeaders requests while waiting
// on another message from the node.
func (c *Conn) ReadAndServe(chain *Chain, timeout time.Duration) Message {
start := time.Now()
for time.Since(start) < timeout {
c.SetReadDeadline(time.Now().Add(5 * time.Second))
switch msg := c.Read().(type) {
case *Ping:
c.Write(&Pong{})
case *GetBlockHeaders:
req := *msg
headers, err := chain.GetHeaders(req)
if err != nil {
return errorf("could not get headers for inbound header request: %v", err)
}
if err := c.Write(headers); err != nil {
return errorf("could not write to connection: %v", err)
}
default:
return msg
}
}
return errorf("no message received within %v", timeout)
}
func (c *Conn) Write(msg Message) error {
// check if message is eth protocol message
var (
payload []byte
err error
)
payload, err = rlp.EncodeToBytes(msg)
if err != nil {
return err
}
_, err = c.Conn.Write(uint64(msg.Code()), payload)
return err
}
// handshake checks to make sure a `HELLO` is received.
func (c *Conn) handshake(t *utesting.T) Message {
defer c.SetDeadline(time.Time{})
c.SetDeadline(time.Now().Add(10 * time.Second))
// write hello to client
pub0 := crypto.FromECDSAPub(&c.ourKey.PublicKey)[1:]
ourHandshake := &Hello{
Version: 5,
Caps: c.caps,
ID: pub0,
}
if err := c.Write(ourHandshake); err != nil {
t.Fatalf("could not write to connection: %v", err)
}
// read hello from client
switch msg := c.Read().(type) {
case *Hello:
// set snappy if version is at least 5
if msg.Version >= 5 {
c.SetSnappy(true)
}
c.negotiateEthProtocol(msg.Caps)
if c.negotiatedProtoVersion == 0 {
t.Fatalf("unexpected eth protocol version")
}
return msg
default:
t.Fatalf("bad handshake: %#v", msg)
return nil
}
}
// negotiateEthProtocol sets the Conn's eth protocol version
// to highest advertised capability from peer
func (c *Conn) negotiateEthProtocol(caps []p2p.Cap) {
var highestEthVersion uint
for _, capability := range caps {
if capability.Name != "eth" {
continue
}
if capability.Version > highestEthVersion && capability.Version <= c.ourHighestProtoVersion {
highestEthVersion = capability.Version
}
}
c.negotiatedProtoVersion = highestEthVersion
}
// statusExchange performs a `Status` message exchange with the given
// node.
func (c *Conn) statusExchange(t *utesting.T, chain *Chain, status *Status) Message {
defer c.SetDeadline(time.Time{})
c.SetDeadline(time.Now().Add(20 * time.Second))
// read status message from client
var message Message
loop:
for {
switch msg := c.Read().(type) {
case *Status:
if have, want := msg.Head, chain.blocks[chain.Len()-1].Hash(); have != want {
t.Fatalf("wrong head block in status, want: %#x (block %d) have %#x",
want, chain.blocks[chain.Len()-1].NumberU64(), have)
}
if have, want := msg.TD.Cmp(chain.TD(chain.Len())), 0; have != want {
t.Fatalf("wrong TD in status: have %v want %v", have, want)
}
if have, want := msg.ForkID, chain.ForkID(); !reflect.DeepEqual(have, want) {
t.Fatalf("wrong fork ID in status: have %v, want %v", have, want)
}
message = msg
break loop
case *Disconnect:
t.Fatalf("disconnect received: %v", msg.Reason)
case *Ping:
c.Write(&Pong{}) // TODO (renaynay): in the future, this should be an error
// (PINGs should not be a response upon fresh connection)
default:
t.Fatalf("bad status message: %s", pretty.Sdump(msg))
}
}
// make sure eth protocol version is set for negotiation
if c.negotiatedProtoVersion == 0 {
t.Fatalf("eth protocol version must be set in Conn")
}
if status == nil {
// write status message to client
status = &Status{
ProtocolVersion: uint32(c.negotiatedProtoVersion),
NetworkID: chain.chainConfig.ChainID.Uint64(),
TD: chain.TD(chain.Len()),
Head: chain.blocks[chain.Len()-1].Hash(),
Genesis: chain.blocks[0].Hash(),
ForkID: chain.ForkID(),
}
}
if err := c.Write(status); err != nil {
t.Fatalf("could not write to connection: %v", err)
}
return message
}
// waitForBlock waits for confirmation from the client that it has
// imported the given block.
func (c *Conn) waitForBlock(block *types.Block) error {
defer c.SetReadDeadline(time.Time{})
c.SetReadDeadline(time.Now().Add(20 * time.Second))
// note: if the node has not yet imported the block, it will respond
// to the GetBlockHeaders request with an empty BlockHeaders response,
// so the GetBlockHeaders request must be sent again until the BlockHeaders
// response contains the desired header.
for {
req := &GetBlockHeaders{Origin: eth.HashOrNumber{Hash: block.Hash()}, Amount: 1}
if err := c.Write(req); err != nil {
return err
}
switch msg := c.Read().(type) {
case *BlockHeaders:
for _, header := range *msg {
if header.Number.Uint64() == block.NumberU64() {
return nil
}
}
time.Sleep(100 * time.Millisecond)
default:
return fmt.Errorf("invalid message: %s", pretty.Sdump(msg))
}
}
}