Jeff Garzik
11 years ago
4 changed files with 0 additions and 313 deletions
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### PyMiner ### |
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This is a 'getwork' CPU mining client for Bitcoin. It is pure-python, and therefore very, very slow. The purpose is to provide a reference implementation of a miner, for study. |
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### Other Resources ### |
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- [BitcoinTalk Thread](https://bitcointalk.org/index.php?topic=3546.0) |
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- [Jgarzik Repo](https://github.com/jgarzik/pyminer) |
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# |
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# RPC login details |
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# |
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host=127.0.0.1 |
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port=8332 |
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rpcuser=myusername |
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rpcpass=mypass |
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# |
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# mining details |
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# |
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threads=4 |
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# periodic rate for requesting new work, if solution not found |
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scantime=60 |
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# |
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# misc. |
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# |
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# not really used right now |
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logdir=/tmp/pyminer |
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# set to 1, to enable hashmeter output |
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hashmeter=0 |
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#!/usr/bin/python |
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# |
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# Copyright (c) 2011 The Bitcoin developers |
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# Distributed under the MIT/X11 software license, see the accompanying |
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# file COPYING or http://www.opensource.org/licenses/mit-license.php. |
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# |
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import sys |
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from multiprocessing import Process |
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import time |
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import struct |
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import hashlib |
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import base64 |
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import re |
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import httplib |
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import json |
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ERR_SLEEP = 15 |
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MAX_NONCE = 1000000L |
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settings = {} |
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class BitcoinRPC: |
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object_id = 1 |
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def __init__(self, host, port, username, password): |
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authpair = "{0}:{1}".format(username, password) |
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self.authhdr = "Basic {0}".format(base64.b64encode(authpair)) |
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self.conn = httplib.HTTPConnection(host, port, strict=False, timeout=30) |
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def rpc(self, method, params=None): |
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self.object_id += 1 |
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obj = {'version' : '1.1', |
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'method' : method, |
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'id' : self.object_id, |
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'params' : params or []} |
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self.conn.request('POST', '/', json.dumps(obj), |
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{ 'Authorization' : self.authhdr, |
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'Content-type' : 'application/json' }) |
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resp = self.conn.getresponse() |
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if resp is None: |
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print("JSON-RPC: no response") |
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return None |
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body = resp.read() |
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resp_obj = json.loads(body) |
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if resp_obj is None: |
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print("JSON-RPC: cannot JSON-decode body") |
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return None |
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if 'error' in resp_obj and resp_obj['error'] != None: |
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return resp_obj['error'] |
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if 'result' not in resp_obj: |
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print("JSON-RPC: no result in object") |
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return None |
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return resp_obj['result'] |
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def getblockcount(self): |
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return self.rpc('getblockcount') |
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def getwork(self, data=None): |
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return self.rpc('getwork', data) |
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def uint32(x): |
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return x & 0xffffffffL |
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def bytereverse(x): |
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return uint32(( ((x) << 24) | (((x) << 8) & 0x00ff0000) | |
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(((x) >> 8) & 0x0000ff00) | ((x) >> 24) )) |
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def bufreverse(in_buf): |
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out_words = [] |
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for i in range(0, len(in_buf), 4): |
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word = struct.unpack('@I', in_buf[i:i+4])[0] |
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out_words.append(struct.pack('@I', bytereverse(word))) |
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return ''.join(out_words) |
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def wordreverse(in_buf): |
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out_words = [] |
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for i in range(0, len(in_buf), 4): |
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out_words.append(in_buf[i:i+4]) |
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out_words.reverse() |
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return ''.join(out_words) |
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class Miner: |
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def __init__(self, id): |
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self.id = id |
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self.max_nonce = MAX_NONCE |
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def work(self, datastr, targetstr): |
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# decode work data hex string to binary |
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static_data = datastr.decode('hex') |
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static_data = bufreverse(static_data) |
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# the first 76b of 80b do not change |
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blk_hdr = static_data[:76] |
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# decode 256-bit target value |
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targetbin = targetstr.decode('hex') |
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targetbin = targetbin[::-1] # byte-swap and dword-swap |
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targetbin_str = targetbin.encode('hex') |
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target = long(targetbin_str, 16) |
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# pre-hash first 76b of block header |
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static_hash = hashlib.sha256() |
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static_hash.update(blk_hdr) |
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for nonce in xrange(self.max_nonce): |
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# encode 32-bit nonce value |
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nonce_bin = struct.pack("<I", nonce) |
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# hash final 4b, the nonce value |
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hash1_o = static_hash.copy() |
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hash1_o.update(nonce_bin) |
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hash1 = hash1_o.digest() |
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# sha256 hash of sha256 hash |
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hash_o = hashlib.sha256() |
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hash_o.update(hash1) |
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hash = hash_o.digest() |
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# quick test for winning solution: high 32 bits zero? |
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if hash[-4:] != '\0\0\0\0': |
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continue |
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# convert binary hash to 256-bit Python long |
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hash = bufreverse(hash) |
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hash = wordreverse(hash) |
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hash_str = hash.encode('hex') |
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long_hash = long(hash_str, 16) |
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# proof-of-work test: hash < target |
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if long_hash < target: |
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print(time.asctime(), "PROOF-OF-WORK found: " |
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"{0:064x}".format(long_hash)) |
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return (nonce + 1, nonce_bin) |
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else: |
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print(time.asctime(), "PROOF-OF-WORK false" |
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"positive {0:064x}".format(long_hash)) |
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return (nonce + 1, None) |
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def submit_work(self, rpc, original_data, nonce_bin): |
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nonce_bin = bufreverse(nonce_bin) |
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nonce = nonce_bin.encode('hex') |
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solution = original_data[:152] + nonce + original_data[160:256] |
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param_arr = [ solution ] |
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result = rpc.getwork(param_arr) |
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print(time.asctime(), "--> Upstream RPC result:", result) |
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def iterate(self, rpc): |
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work = rpc.getwork() |
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if work is None: |
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time.sleep(ERR_SLEEP) |
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return |
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if 'data' not in work or 'target' not in work: |
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time.sleep(ERR_SLEEP) |
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return |
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time_start = time.time() |
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(hashes_done, nonce_bin) = self.work(work['data'], |
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work['target']) |
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time_end = time.time() |
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time_diff = time_end - time_start |
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self.max_nonce = long( |
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(hashes_done * settings['scantime']) / time_diff) |
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if self.max_nonce > 0xfffffffaL: |
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self.max_nonce = 0xfffffffaL |
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if settings['hashmeter']: |
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print("HashMeter({:d}): {:d} hashes, {:.2f} Khash/sec".format( |
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self.id, hashes_done, (hashes_done / 1000.0) / time_diff)) |
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if nonce_bin is not None: |
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self.submit_work(rpc, work['data'], nonce_bin) |
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def loop(self): |
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rpc = BitcoinRPC(settings['host'], settings['port'], |
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settings['rpcuser'], settings['rpcpass']) |
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if rpc is not None: |
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while True: |
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self.iterate(rpc) |
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self.conn.close() |
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def miner_thread(id): |
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miner = Miner(id) |
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miner.loop() |
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if __name__ == '__main__': |
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if len(sys.argv) != 2: |
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print("Usage: pyminer.py CONFIG-FILE") |
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sys.exit(1) |
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with open(sys.argv[1]) as f: |
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for line in f: |
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# skip comment lines |
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m = re.search('^\s*#', line) |
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if m: |
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continue |
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# parse key=value lines |
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m = re.search('^(\w+)\s*=\s*(\S.*)$', line) |
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if m is None: |
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continue |
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settings[m.group(1)] = m.group(2) |
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settings.setdefault('host', '127.0.0.1') |
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settings.setdefault('port', 8332) |
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settings.setdefault('threads', 1) |
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settings.setdefault('hashmeter', 0) |
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settings.setdefault('scantime', 30L) |
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if 'rpcuser' not in settings or 'rpcpass' not in settings: |
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print("Missing username and/or password in cfg file") |
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sys.exit(1) |
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settings['port'] = int(settings['port']) |
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settings['threads'] = int(settings['threads']) |
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settings['hashmeter'] = int(settings['hashmeter']) |
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settings['scantime'] = long(settings['scantime']) |
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thread_list = [] |
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for thread_id in range(settings['threads']): |
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p = Process(target=miner_thread, args=(thread_id,)) |
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p.start() |
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thread_list.append(p) |
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time.sleep(1) # stagger threads |
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print(settings['threads'], "mining threads started") |
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print(time.asctime(), "Miner Starts - {0}:{1}".format(settings['host'], |
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settings['port'])) |
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try: |
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for thread_process in thread_list: |
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thread_process.join() |
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except KeyboardInterrupt: |
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pass |
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print(time.asctime(), "Miner Stops - {0}:{1}".format(settings['host'], |
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settings['port'])) |
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