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
|
#!/usr/bin/env python3
# Copyright (c) 2015-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""BlockStore and TxStore helper classes."""
from .mininode import *
from io import BytesIO
import dbm.dumb as dbmd
logger = logging.getLogger("TestFramework.blockstore")
class BlockStore():
"""BlockStore helper class.
BlockStore keeps a map of blocks and implements helper functions for
responding to getheaders and getdata, and for constructing a getheaders
message.
"""
def __init__(self, datadir):
self.blockDB = dbmd.open(datadir + "/blocks", 'c')
self.currentBlock = 0
self.headers_map = dict()
def close(self):
self.blockDB.close()
def erase(self, blockhash):
del self.blockDB[repr(blockhash)]
# lookup an entry and return the item as raw bytes
def get(self, blockhash):
value = None
try:
value = self.blockDB[repr(blockhash)]
except KeyError:
return None
return value
# lookup an entry and return it as a CBlock
def get_block(self, blockhash):
ret = None
serialized_block = self.get(blockhash)
if serialized_block is not None:
f = BytesIO(serialized_block)
ret = CBlock()
ret.deserialize(f)
ret.calc_sha256()
return ret
def get_header(self, blockhash):
try:
return self.headers_map[blockhash]
except KeyError:
return None
# Note: this pulls full blocks out of the database just to retrieve
# the headers -- perhaps we could keep a separate data structure
# to avoid this overhead.
def headers_for(self, locator, hash_stop, current_tip=None):
if current_tip is None:
current_tip = self.currentBlock
current_block_header = self.get_header(current_tip)
if current_block_header is None:
return None
response = msg_headers()
headersList = [ current_block_header ]
maxheaders = 2000
while (headersList[0].sha256 not in locator.vHave):
prevBlockHash = headersList[0].hashPrevBlock
prevBlockHeader = self.get_header(prevBlockHash)
if prevBlockHeader is not None:
headersList.insert(0, prevBlockHeader)
else:
break
headersList = headersList[:maxheaders] # truncate if we have too many
hashList = [x.sha256 for x in headersList]
index = len(headersList)
if (hash_stop in hashList):
index = hashList.index(hash_stop)+1
response.headers = headersList[:index]
return response
def add_block(self, block):
block.calc_sha256()
try:
self.blockDB[repr(block.sha256)] = bytes(block.serialize())
except TypeError as e:
logger.exception("Unexpected error")
self.currentBlock = block.sha256
self.headers_map[block.sha256] = CBlockHeader(block)
def add_header(self, header):
self.headers_map[header.sha256] = header
# lookup the hashes in "inv", and return p2p messages for delivering
# blocks found.
def get_blocks(self, inv):
responses = []
for i in inv:
if (i.type == 2 or i.type == (2 | (1 << 30))): # MSG_BLOCK or MSG_WITNESS_BLOCK
data = self.get(i.hash)
if data is not None:
# Use msg_generic to avoid re-serialization
responses.append(msg_generic(b"block", data))
return responses
def get_locator(self, current_tip=None):
if current_tip is None:
current_tip = self.currentBlock
r = []
counter = 0
step = 1
lastBlock = self.get_block(current_tip)
while lastBlock is not None:
r.append(lastBlock.hashPrevBlock)
for i in range(step):
lastBlock = self.get_block(lastBlock.hashPrevBlock)
if lastBlock is None:
break
counter += 1
if counter > 10:
step *= 2
locator = CBlockLocator()
locator.vHave = r
return locator
class TxStore():
def __init__(self, datadir):
self.txDB = dbmd.open(datadir + "/transactions", 'c')
def close(self):
self.txDB.close()
# lookup an entry and return the item as raw bytes
def get(self, txhash):
value = None
try:
value = self.txDB[repr(txhash)]
except KeyError:
return None
return value
def add_transaction(self, tx):
tx.calc_sha256()
try:
self.txDB[repr(tx.sha256)] = bytes(tx.serialize())
except TypeError as e:
logger.exception("Unexpected error")
def get_transactions(self, inv):
responses = []
for i in inv:
if (i.type == 1 or i.type == (1 | (1 << 30))): # MSG_TX or MSG_WITNESS_TX
tx = self.get(i.hash)
if tx is not None:
responses.append(msg_generic(b"tx", tx))
return responses
|
