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protocol.go
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protocol.go
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// Copyright 2014 The go-ethereum Authors
package cpc
import (
"fmt"
"io"
"math/big"
"bitbucket.org/cpchain/chain/core"
"bitbucket.org/cpchain/chain/protocols/cpc/configs"
"bitbucket.org/cpchain/chain/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rlp"
)
// ProtocolName is the official short name of the protocol used during capability negotiation.
var ProtocolName = "cpc"
// ProtocolVersions are the versions of the cpchain protocol (first is primary).
var ProtocolVersions = []uint{configs.Cpc1}
// ProtocolLengths are the number of implemented message corresponding to different protocol versions.
var ProtocolLengths = []uint64{100}
const ProtocolMaxMsgSize = 10 * 1024 * 1024 // Maximum cap on the size of a protocol message
// eth protocol message codes
const (
// Protocol messages belonging to eth/62
StatusMsg = 0x00
NewBlockHashesMsg = 0x01
TxMsg = 0x02
GetBlockHeadersMsg = 0x03
BlockHeadersMsg = 0x04
GetBlockBodiesMsg = 0x05
BlockBodiesMsg = 0x06
NewBlockMsg = 0x07
GetBlocksMsg = 0x08
BlocksMsg = 0x09
// Protocol messages belonging to eth/63
GetNodeDataMsg = 0x0d
NodeDataMsg = 0x0e
GetReceiptsMsg = 0x0f
ReceiptsMsg = 0x10
)
type errCode int
const (
ErrMsgTooLarge = iota
ErrDecode
ErrInvalidMsgCode
ErrProtocolVersionMismatch
ErrNetworkIdMismatch
ErrGenesisBlockMismatch
ErrNoStatusMsg
ErrExtraStatusMsg
ErrSuspendedPeer
)
func (e errCode) String() string {
return errorToString[int(e)]
}
// XXX change once legacy code is out
var errorToString = map[int]string{
ErrMsgTooLarge: "Message too long",
ErrDecode: "Invalid message",
ErrInvalidMsgCode: "Invalid message code",
ErrProtocolVersionMismatch: "Protocol version mismatch",
ErrNetworkIdMismatch: "NetworkId mismatch",
ErrGenesisBlockMismatch: "Genesis block mismatch",
ErrNoStatusMsg: "No status message",
ErrExtraStatusMsg: "Extra status message",
ErrSuspendedPeer: "Suspended peer",
}
type txPool interface {
// AddRemotes should add the given transactions to the pool.
AddRemotes([]*types.Transaction) []error
// Pending should return pending transactions.
// The slice should be modifiable by the caller.
Pending() (map[common.Address]types.Transactions, error)
// SubscribeNewTxsEvent should return an event subscription of
// NewTxsEvent and send events to the given channel.
SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription
}
// statusData is the network packet for the status message.
type statusData struct {
ProtocolVersion uint32
NetworkId uint64
Height *big.Int
CurrentBlock common.Hash
GenesisBlock common.Hash
IsMinerOrValidator bool
}
func (s *statusData) FormatString() string {
var height uint64
if s.Height != nil {
height = s.Height.Uint64()
} else {
height = 0
}
return fmt.Sprintf("{ ProtocolVersion: %d, \nNetworkId: %d, \nHeight: %d, \nCurrentBlock: %s, \nGenesisBlock: %s, \nIsMiner: %v }",
s.ProtocolVersion, s.NetworkId, height, s.CurrentBlock.Hex(), s.GenesisBlock.Hex(), s.IsMinerOrValidator)
}
type signerStatusData struct {
ProtocolVersion uint32
Address common.Address
}
// newBlockHashesData is the network packet for the block announcements.
type newBlockHashesData []struct {
Hash common.Hash // Hash of one particular block being announced
Number uint64 // Number of one particular block being announced
}
// getBlockHeadersData represents a block header query.
type getBlockHeadersData struct {
Origin hashOrNumber // Block from which to retrieve headers
Amount uint64 // Maximum number of headers to retrieve
Skip uint64 // Blocks to skip between consecutive headers
Reverse bool // Query direction (false = rising towards latest, true = falling towards genesis)
}
// hashOrNumber is a combined field for specifying an origin block.
type hashOrNumber struct {
Hash common.Hash // Block hash from which to retrieve headers (excludes Number)
Number uint64 // Block hash from which to retrieve headers (excludes Hash)
}
// EncodeRLP is a specialized encoder for hashOrNumber to encode only one of the
// two contained union fields.
func (hn *hashOrNumber) EncodeRLP(w io.Writer) error {
if hn.Hash == (common.Hash{}) {
return rlp.Encode(w, hn.Number)
}
if hn.Number != 0 {
return fmt.Errorf("both origin hash (%x) and number (%d) provided", hn.Hash, hn.Number)
}
return rlp.Encode(w, hn.Hash)
}
// DecodeRLP is a specialized decoder for hashOrNumber to decode the contents
// into either a block hash or a block number.
func (hn *hashOrNumber) DecodeRLP(s *rlp.Stream) error {
_, size, _ := s.Kind()
origin, err := s.Raw()
if err == nil {
switch {
case size == 32:
err = rlp.DecodeBytes(origin, &hn.Hash)
case size <= 8:
err = rlp.DecodeBytes(origin, &hn.Number)
default:
err = fmt.Errorf("invalid input size %d for origin", size)
}
}
return err
}
// newBlockData is the network packet for the block propagation message.
type newBlockData struct {
Block *types.Block
}
// blockBody represents the data content of a single block.
type blockBody struct {
Transactions []*types.Transaction // Transactions contained within a block
}
// blockBodiesData is the network packet for block content distribution.
type blockBodiesData []*blockBody