ThomasV
12 years ago
6 changed files with 275 additions and 122 deletions
@ -1,5 +1,6 @@ |
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from util import format_satoshis |
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from wallet import Wallet, WalletSynchronizer, WalletVerifier |
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from wallet import Wallet, WalletSynchronizer |
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from verifier import WalletVerifier |
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from interface import Interface, pick_random_server, DEFAULT_SERVERS |
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from simple_config import SimpleConfig |
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import bitcoin |
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@ -0,0 +1,268 @@ |
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#!/usr/bin/env python |
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# |
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# Electrum - lightweight Bitcoin client |
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# Copyright (C) 2012 thomasv@ecdsa.org |
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# |
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# This program is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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import threading, time, Queue, os, sys |
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from util import user_dir |
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from bitcoin import * |
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class WalletVerifier(threading.Thread): |
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def __init__(self, wallet, config): |
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threading.Thread.__init__(self) |
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self.daemon = True |
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self.config = config |
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self.wallet = wallet |
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self.interface = self.wallet.interface |
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self.interface.register_channel('verifier') |
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self.verified_tx = config.get('verified_tx',[]) |
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self.merkle_roots = config.get('merkle_roots',{}) # hashed by me |
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self.targets = config.get('targets',{}) # compute targets |
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self.lock = threading.Lock() |
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#self.config.set_key('verified_tx', [], True) |
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#for i in range(70): self.get_target(i) |
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#sys.exit() |
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def run(self): |
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requested_merkle = [] |
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requested_chunks = [] |
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while True: |
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# request missing chunks |
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max_index = self.wallet.blocks/2016 |
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if not requested_chunks: |
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for i in range(0, max_index + 1): |
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# test if we can read the first header of the chunk |
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if self.read_header(i*2016): continue |
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print "requesting chunk", i |
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self.interface.send([ ('blockchain.block.get_chunk',[i])], 'verifier') |
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requested_chunks.append(i) |
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break |
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# todo: request missing blocks too |
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# request missing tx merkle |
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txlist = self.wallet.get_tx_hashes() |
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for tx in txlist: |
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if tx not in self.verified_tx: |
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if tx not in requested_merkle: |
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requested_merkle.append(tx) |
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self.request_merkle(tx) |
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break |
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try: |
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r = self.interface.get_response('verifier',timeout=1) |
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except Queue.Empty: |
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time.sleep(1) |
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continue |
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# 3. handle response |
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method = r['method'] |
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params = r['params'] |
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result = r['result'] |
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if method == 'blockchain.transaction.get_merkle': |
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tx_hash = params[0] |
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self.verify_merkle(tx_hash, result) |
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requested_merkle.remove(tx_hash) |
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elif method == 'blockchain.block.get_chunk': |
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index = params[0] |
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self.verify_chunk(index, result) |
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requested_chunks.remove(index) |
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elif method == 'blockchain.block.get_header': |
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self.verify_header(result) |
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def request_merkle(self, tx_hash): |
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self.interface.send([ ('blockchain.transaction.get_merkle',[tx_hash]) ], 'verifier') |
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def verify_merkle(self, tx_hash, result): |
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tx_height = result.get('block_height') |
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self.merkle_roots[tx_hash] = self.hash_merkle_root(result['merkle'], tx_hash) |
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header = self.read_header(tx_height) |
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if header: |
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assert header.get('merkle_root') == self.merkle_roots[tx_hash] |
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self.verified_tx.append(tx_hash) |
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print "verified", tx_hash |
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self.config.set_key('verified_tx', self.verified_tx, True) |
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def verify_chunk(self, index, hexdata): |
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data = hexdata.decode('hex') |
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height = index*2016 |
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numblocks = len(data)/80 |
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print "validate_chunk", index, numblocks |
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if index == 0: |
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previous_hash = ("0"*64) |
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else: |
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prev_header = self.read_header(index*2016-1) |
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if prev_header is None: raise |
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previous_hash = self.hash_header(prev_header) |
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bits, target = self.get_target(index) |
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for i in range(numblocks): |
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height = index*2016 + i |
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raw_header = data[i*80:(i+1)*80] |
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header = self.header_from_string(raw_header) |
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_hash = self.hash_header(header) |
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assert previous_hash == header.get('prev_block_hash') |
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try: |
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assert bits == header.get('bits') |
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except: |
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print index, hex(bits), hex(header.get('bits')) |
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try: |
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assert eval('0x'+_hash) < target |
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except: |
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print _hash, hex(target) |
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previous_header = header |
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previous_hash = _hash |
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self.save_chunk(index, data) |
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def validate_header(self, header): |
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""" if there is a previous or a next block in the list, check the hash""" |
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height = header.get('block_height') |
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with self.lock: |
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self.headers[height] = header # detect conflicts |
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prev_header = next_header = None |
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if height-1 in self.headers: |
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prev_header = self.headers[height-1] |
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if height+1 in self.headers: |
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next_header = self.headers[height+1] |
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if prev_header: |
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prev_hash = self.hash_header(prev_header) |
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assert prev_hash == header.get('prev_block_hash') |
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self.save_header(header) |
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if next_header: |
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_hash = self.hash_header(header) |
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assert _hash == next_header.get('prev_block_hash') |
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def header_to_string(self, res): |
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s = int_to_hex(res.get('version'),4) \ |
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+ rev_hex(res.get('prev_block_hash')) \ |
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+ rev_hex(res.get('merkle_root')) \ |
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+ int_to_hex(int(res.get('timestamp')),4) \ |
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+ int_to_hex(int(res.get('bits')),4) \ |
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+ int_to_hex(int(res.get('nonce')),4) |
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return s |
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def header_from_string(self, s): |
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hex_to_int = lambda s: eval('0x' + s[::-1].encode('hex')) |
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h = {} |
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h['version'] = hex_to_int(s[0:4]) |
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h['prev_block_hash'] = hash_encode(s[4:36]) |
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h['merkle_root'] = hash_encode(s[36:68]) |
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h['timestamp'] = hex_to_int(s[68:72]) |
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h['bits'] = hex_to_int(s[72:76]) |
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h['nonce'] = hex_to_int(s[76:80]) |
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return h |
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def hash_header(self, header): |
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return rev_hex(Hash(self.header_to_string(header).decode('hex')).encode('hex')) |
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def hash_merkle_root(self, merkle_s, target_hash): |
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h = hash_decode(target_hash) |
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for item in merkle_s: |
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is_left = item[0] == 'L' |
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h = Hash( h + hash_decode(item[1:]) ) if is_left else Hash( hash_decode(item[1:]) + h ) |
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return hash_encode(h) |
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def save_chunk(self, index, chunk): |
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name = os.path.join( user_dir(), 'blockchain_headers') |
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if os.path.exists(name): |
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f = open(name,'rw+') |
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else: |
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f = open(name,'w+') |
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f.seek(index*2016*80) |
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h = f.write(chunk) |
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f.close() |
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def read_header(self, block_height): |
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name = os.path.join( user_dir(), 'blockchain_headers') |
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if os.path.exists(name): |
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f = open(name,'rb') |
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f.seek(block_height*80) |
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h = f.read(80) |
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f.close() |
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if len(h) == 80: |
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h = self.header_from_string(h) |
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return h |
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def get_target(self, index): |
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max_target = 0x00000000FFFF0000000000000000000000000000000000000000000000000000 |
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if index == 0: return 0x1d00ffff, max_target |
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first = self.read_header((index-1)*2016) |
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last = self.read_header(index*2016-1) |
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nActualTimespan = last.get('timestamp') - first.get('timestamp') |
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nTargetTimespan = 14*24*60*60 |
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nActualTimespan = max(nActualTimespan, nTargetTimespan/4) |
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nActualTimespan = min(nActualTimespan, nTargetTimespan*4) |
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bits = last.get('bits') |
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# convert to bignum |
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MM = 256*256*256 |
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a = bits%MM |
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if a < 0x8000: |
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a *= 256 |
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target = (a) * pow(2, 8 * (bits/MM - 3)) |
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# new target |
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new_target = min( max_target, (target * nActualTimespan)/nTargetTimespan ) |
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# convert it to bits |
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c = ("%064X"%new_target)[2:] |
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i = 31 |
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while c[0:2]=="00": |
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c = c[2:] |
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i -= 1 |
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c = eval('0x'+c[0:6]) |
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if c > 0x800000: |
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c /= 256 |
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i += 1 |
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new_bits = c + MM * i |
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# print "%3d"%index, "%8x"%bits, "%64X"%new_target, hex(c)[2:].upper(), hex(new_bits) |
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return new_bits, new_target |
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