modules/python_bitcoin/composed.py

   1 import bitcoin
   2 import threading
   3 import time
   4
   5 class ExpiryQueue(threading.Thread):
   6
   7     def __init__(self):
   8         self.lock = threading.Lock()
   9         self.items = []
  10         threading.Thread.__init__(self)
  11         self.daemon = True
  12
  13     def run(self):
  14         # Garbage collection
  15         while True:
  16             with self.lock:
  17                 self.items = [i for i in self.items if not i.stopped()]
  18             time.sleep(0.1)
  19
  20     def add(self, item):
  21         with self.lock:
  22             self.items.append(item)
  23
  24 expiry_queue = ExpiryQueue()
  25
  26 class StatementLine:
  27
  28     def __init__(self, output_point):
  29         self.lock = threading.Lock()
  30         self.output_point = output_point
  31         self.output_loaded = None
  32         self.input_point = None
  33         self.input_loaded = None
  34
  35     def is_loaded(self):
  36         with self.lock:
  37             if self.output_loaded is None:
  38                 return False
  39             elif (self.input_point is not False and
  40                   self.input_loaded is None):
  41                 return False
  42         return True
  43
  44 class PaymentHistory:
  45
  46     def __init__(self, chain):
  47         self.chain = chain
  48         self.lock = threading.Lock()
  49         self.statement = []
  50         self._stopped = False
  51
  52     def run(self, address, handle_finish):
  53         self.address = address
  54         self.handle_finish = handle_finish
  55
  56         pubkey_hash = bitcoin.address_to_short_hash(address)
  57         self.chain.fetch_outputs(pubkey_hash, self.start_loading)
  58
  59     def start_loading(self, ec, output_points):
  60         with self.lock:
  61             for outpoint in output_points:
  62                 statement_line = StatementLine(outpoint)
  63                 self.statement.append(statement_line)
  64                 self.chain.fetch_spend(outpoint,
  65                     bitcoin.bind(self.load_spend,
  66                         bitcoin._1, bitcoin._2, statement_line))
  67                 self.load_tx_info(outpoint, statement_line, False)
  68
  69     def load_spend(self, ec, inpoint, statement_line):
  70         with statement_line.lock:
  71             if ec:
  72                 statement_line.input_point = False
  73             else:
  74                 statement_line.input_point = inpoint
  75         self.finish_if_done()
  76         if not ec:
  77             self.load_tx_info(inpoint, statement_line, True)
  78
  79     def finish_if_done(self):
  80         with self.lock:
  81             if any(not line.is_loaded() for line in self.statement):
  82                 return
  83         result = []
  84         for line in self.statement:
  85             if line.input_point:
  86                 line.input_loaded["value"] = -line.output_loaded["value"]
  87                 result.append(line.input_loaded)
  88             result.append(line.output_loaded)
  89         self.handle_finish(result)
  90         self.stop()
  91
  92     def stop(self):
  93         with self.lock:
  94             self._stopped = True
  95
  96     def stopped(self):
  97         with self.lock:
  98             return self._stopped
  99
 100     def load_tx_info(self, point, statement_line, is_input):
 101         info = {}
 102         info["tx_hash"] = str(point.hash)
 103         info["pos"] = point.index
 104         info["is_in"] = 1 if is_input else 0
 105         self.chain.fetch_transaction_index(point.hash,
 106             bitcoin.bind(self.tx_index, bitcoin._1, bitcoin._2, bitcoin._3,
 107                 statement_line, info))
 108
 109     def tx_index(self, ec, block_depth, offset, statement_line, info):
 110         info["height"] = block_depth
 111         self.chain.fetch_block_header_by_depth(block_depth,
 112             bitcoin.bind(self.block_header, bitcoin._1, bitcoin._2,
 113                 statement_line, info))
 114
 115     def block_header(self, ec, blk_head, statement_line, info):
 116         info["time"] = blk_head.timestamp
 117         info["blk_hash"] = str(bitcoin.hash_block_header(blk_head))
 118         tx_hash = bitcoin.hash_digest(info["tx_hash"])
 119         self.chain.fetch_transaction(tx_hash,
 120             bitcoin.bind(self.load_tx, bitcoin._1, bitcoin._2,
 121                 statement_line, info))
 122
 123     def load_tx(self, ec, tx, statement_line, info):
 124         outputs = []
 125         for tx_out in tx.outputs:
 126             script = tx_out.output_script
 127             if script.type() == bitcoin.payment_type.pubkey_hash:
 128                 pkh = bitcoin.short_hash(str(script.operations()[2].data))
 129                 outputs.append(bitcoin.public_key_hash_to_address(pkh))
 130             else:
 131                 outputs.append("Unknown")
 132         info["outputs"] = outputs
 133         info["inputs"] = [None for i in range(len(tx.inputs))]
 134         if info["is_in"] == 1:
 135             info["inputs"][info["pos"]] = self.address
 136         else:
 137             info["value"] = tx.outputs[info["pos"]].value
 138         if not [empty_in for empty_in in info["inputs"] if empty_in is None]:
 139             # We have the sole input
 140             assert(info["is_in"] == 1)
 141             with statement_line.lock:
 142                 statement_line.input_loaded = info
 143             self.finish_if_done()
 144         for tx_idx, tx_in in enumerate(tx.inputs):
 145             if info["is_in"] == 1 and info["pos"] == tx_idx:
 146                 continue
 147             self.chain.fetch_transaction(tx_in.previous_output.hash,
 148                 bitcoin.bind(self.load_input, bitcoin._1, bitcoin._2,
 149                     tx_in.previous_output.index, statement_line, info, tx_idx))
 150
 151     def load_input(self, ec, tx, index, statement_line, info, inputs_index):
 152         script = tx.outputs[index].output_script
 153         if script.type() == bitcoin.payment_type.pubkey_hash:
 154             pkh = bitcoin.short_hash(str(script.operations()[2].data))
 155             info["inputs"][inputs_index] = \
 156                 bitcoin.public_key_hash_to_address(pkh)
 157         else:
 158             info["inputs"][inputs_index] = "Unknown"
 159         if not [empty_in for empty_in in info["inputs"] if empty_in is None]:
 160             with statement_line.lock:
 161                 if info["is_in"] == 1:
 162                     statement_line.input_loaded = info
 163                 else:
 164                     statement_line.output_loaded = info
 165         self.finish_if_done()
 166
 167 def payment_history(chain, address, handle_finish):
 168     ph = PaymentHistory(chain)
 169     expiry_queue.add(ph)
 170     ph.run(address, handle_finish)
 171
 172 if __name__ == "__main__":
 173     def finish(result):
 174         print result
 175     def last(ec, depth):
 176         print "D:", depth
 177
 178     service = bitcoin.async_service(1)
 179     prefix = "/home/genjix/libbitcoin/database"
 180     chain = bitcoin.bdb_blockchain(service, prefix)
 181     chain.fetch_last_depth(last)
 182     address = "1Pbn3DLXfjqF1fFV9YPdvpvyzejZwkHhZE"
 183     print "Looking up", address
 184     payment_history(chain, address, finish)
 185     raw_input()
 186