aboutsummaryrefslogtreecommitdiffstats
path: root/eth/protocol.go
blob: 4bc8bee72959e556b97160b49914f0ecc235e653 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
// Copyright 2014 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 eth

import (
    "fmt"
    "io"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/rlp"
)

// Constants to match up protocol versions and messages
const (
    eth62 = 62
    eth63 = 63
)

// Official short name of the protocol used during capability negotiation.
var ProtocolName = "eth"

// Supported versions of the eth protocol (first is primary).
var ProtocolVersions = []uint{eth63, eth62}

// Number of implemented message corresponding to different protocol versions.
var ProtocolLengths = []uint64{17, 8}

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

    // 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 {
    // AddBatch should add the given transactions to the pool.
    AddBatch([]*types.Transaction) error

    // Pending should return pending transactions.
    // The slice should be modifiable by the caller.
    Pending() (map[common.Address]types.Transactions, error)
}

// statusData is the network packet for the status message.
type statusData struct {
    ProtocolVersion uint32
    NetworkId       uint64
    TD              *big.Int
    CurrentBlock    common.Hash
    GenesisBlock    common.Hash
}

// 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
    TD    *big.Int
}

// blockBody represents the data content of a single block.
type blockBody struct {
    Transactions []*types.Transaction // Transactions contained within a block
    Uncles       []*types.Header      // Uncles contained within a block
}

// blockBodiesData is the network packet for block content distribution.
type blockBodiesData []*blockBody