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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
package eth
import (
"fmt"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/rlp"
)
func errResp(code errCode, format string, v ...interface{}) error {
return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
}
// main entrypoint, wrappers starting a server running the eth protocol
// use this constructor to attach the protocol ("class") to server caps
// the Dev p2p layer then runs the protocol instance on each peer
func EthProtocol(protocolVersion, networkId int, txPool txPool, chainManager chainManager, downloader *downloader.Downloader) p2p.Protocol {
protocol := newProtocolManager(txPool, chainManager, downloader)
return p2p.Protocol{
Name: "eth",
Version: uint(protocolVersion),
Length: ProtocolLength,
Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
//return runEthProtocol(protocolVersion, networkId, txPool, chainManager, downloader, p, rw)
peer := protocol.newPeer(protocolVersion, networkId, p, rw)
err := protocol.handle(peer)
glog.V(logger.Detail).Infof("[%s]: %v\n", peer.id, err)
return err
},
}
}
type hashFetcherFn func(common.Hash) error
type blockFetcherFn func([]common.Hash) error
// extProt is an interface which is passed around so we can expose GetHashes and GetBlock without exposing it to the rest of the protocol
// extProt is passed around to peers which require to GetHashes and GetBlocks
type extProt struct {
getHashes hashFetcherFn
getBlocks blockFetcherFn
}
func (ep extProt) GetHashes(hash common.Hash) error { return ep.getHashes(hash) }
func (ep extProt) GetBlock(hashes []common.Hash) error { return ep.getBlocks(hashes) }
type EthProtocolManager struct {
protVer, netId int
txpool txPool
chainman chainManager
downloader *downloader.Downloader
pmu sync.Mutex
peers map[string]*peer
}
func newProtocolManager(txpool txPool, chainman chainManager, downloader *downloader.Downloader) *EthProtocolManager {
return &EthProtocolManager{
txpool: txpool,
chainman: chainman,
downloader: downloader,
peers: make(map[string]*peer),
}
}
func (pm *EthProtocolManager) newPeer(pv, nv int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
pm.pmu.Lock()
defer pm.pmu.Unlock()
td, current, genesis := pm.chainman.Status()
peer := newPeer(pv, nv, genesis, current, td, p, rw)
pm.peers[peer.id] = peer
return peer
}
func (pm *EthProtocolManager) handle(p *peer) error {
if err := p.handleStatus(); err != nil {
return err
}
pm.downloader.RegisterPeer(p.id, p.td, p.currentHash, p.requestHashes, p.requestBlocks)
defer pm.downloader.UnregisterPeer(p.id)
// propagate existing transactions. new transactions appearing
// after this will be sent via broadcasts.
if err := p.sendTransactions(pm.txpool.GetTransactions()); err != nil {
return err
}
// main loop. handle incoming messages.
for {
if err := pm.handleMsg(p); err != nil {
return err
}
}
return nil
}
func (self *EthProtocolManager) handleMsg(p *peer) error {
msg, err := p.rw.ReadMsg()
if err != nil {
return err
}
if msg.Size > ProtocolMaxMsgSize {
return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
}
// make sure that the payload has been fully consumed
defer msg.Discard()
switch msg.Code {
case GetTxMsg: // ignore
case StatusMsg:
return errResp(ErrExtraStatusMsg, "uncontrolled status message")
case TxMsg:
// TODO: rework using lazy RLP stream
var txs []*types.Transaction
if err := msg.Decode(&txs); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
for i, tx := range txs {
if tx == nil {
return errResp(ErrDecode, "transaction %d is nil", i)
}
jsonlogger.LogJson(&logger.EthTxReceived{
TxHash: tx.Hash().Hex(),
RemoteId: p.ID().String(),
})
}
self.txpool.AddTransactions(txs)
case GetBlockHashesMsg:
var request getBlockHashesMsgData
if err := msg.Decode(&request); err != nil {
return errResp(ErrDecode, "->msg %v: %v", msg, err)
}
if request.Amount > maxHashes {
request.Amount = maxHashes
}
hashes := self.chainman.GetBlockHashesFromHash(request.Hash, request.Amount)
return p.sendBlockHashes(hashes)
case BlockHashesMsg:
msgStream := rlp.NewStream(msg.Payload)
var hashes []common.Hash
if err := msgStream.Decode(&hashes); err != nil {
break
}
self.downloader.HashCh <- hashes
case GetBlocksMsg:
msgStream := rlp.NewStream(msg.Payload)
if _, err := msgStream.List(); err != nil {
return err
}
var blocks []*types.Block
var i int
for {
i++
var hash common.Hash
err := msgStream.Decode(&hash)
if err == rlp.EOL {
break
} else if err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
block := self.chainman.GetBlock(hash)
if block != nil {
blocks = append(blocks, block)
}
if i == maxBlocks {
break
}
}
return p.sendBlocks(blocks)
case BlocksMsg:
msgStream := rlp.NewStream(msg.Payload)
var blocks []*types.Block
if err := msgStream.Decode(&blocks); err != nil {
glog.V(logger.Detail).Infoln("Decode error", err)
fmt.Println("decode error", err)
blocks = nil
}
self.downloader.DeliverChunk(p.id, blocks)
case NewBlockMsg:
var request newBlockMsgData
if err := msg.Decode(&request); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
if err := request.Block.ValidateFields(); err != nil {
return errResp(ErrDecode, "block validation %v: %v", msg, err)
}
hash := request.Block.Hash()
_, chainHead, _ := self.chainman.Status()
jsonlogger.LogJson(&logger.EthChainReceivedNewBlock{
BlockHash: hash.Hex(),
BlockNumber: request.Block.Number(), // this surely must be zero
ChainHeadHash: chainHead.Hex(),
BlockPrevHash: request.Block.ParentHash().Hex(),
RemoteId: p.ID().String(),
})
self.downloader.AddBlock(p.id, request.Block, request.TD)
default:
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
}
return nil
}
|
