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         self.load_tx_info(inpoint, statement_line, True)
  77
  78     def finish_if_done(self):
  79         with self.lock:
  80             if any(not line.is_loaded() for line in self.statement):
  81                 return
  82         result = []
  83         for line in self.statement:
  84             line.input_loaded["value"] = -line.output_loaded["value"]
  85             result.append(line.input_loaded)
  86             result.append(line.output_loaded)
  87         self.handle_finish(result)
  88         self.stop()
  89
  90     def stop(self):
  91         with self.lock:
  92             self._stopped = True
  93
  94     def stopped(self):
  95         with self.lock:
  96             return self._stopped
  97
  98     def load_tx_info(self, point, statement_line, is_input):
  99         info = {}
 100         info["tx_hash"] = str(point.hash)
 101         info["pos"] = point.index
 102         info["is_in"] = 1 if is_input else 0
 103         self.chain.fetch_transaction_index(point.hash,
 104             bitcoin.bind(self.tx_index, bitcoin._1, bitcoin._2, bitcoin._3,
 105                 statement_line, info))
 106
 107     def tx_index(self, ec, block_depth, offset, statement_line, info):
 108         info["height"] = block_depth
 109         self.chain.fetch_block_header_by_depth(block_depth,
 110             bitcoin.bind(self.block_header, bitcoin._1, bitcoin._2,
 111                 statement_line, info))
 112
 113     def block_header(self, ec, blk_head, statement_line, info):
 114         info["time"] = blk_head.timestamp
 115         info["blk_hash"] = str(bitcoin.hash_block_header(blk_head))
 116         tx_hash = bitcoin.hash_digest(info["tx_hash"])
 117         self.chain.fetch_transaction(tx_hash,
 118             bitcoin.bind(self.load_tx, bitcoin._1, bitcoin._2,
 119                 statement_line, info))
 120
 121     def load_tx(self, ec, tx, statement_line, info):
 122         outputs = []
 123         for tx_out in tx.outputs:
 124             script = tx_out.output_script
 125             if script.type() == bitcoin.payment_type.pubkey_hash:
 126                 pkh = bitcoin.short_hash(str(script.operations()[2].data))
 127                 outputs.append(bitcoin.public_key_hash_to_address(pkh))
 128             else:
 129                 outputs.append("Unknown")
 130         info["outputs"] = outputs
 131         info["inputs"] = [None for i in range(len(tx.inputs))]
 132         if info["is_in"] == 1:
 133             info["inputs"][info["pos"]] = self.address
 134         else:
 135             info["value"] = tx.outputs[info["pos"]].value
 136         if not [empty_in for empty_in in info["inputs"] if empty_in is None]:
 137             # We have the sole input
 138             assert(info["is_in"] == 1)
 139             with statement_line.lock:
 140                 statement_line.input_loaded = info
 141             self.finish_if_done()
 142         for tx_idx, tx_in in enumerate(tx.inputs):
 143             if info["is_in"] == 1 and info["pos"] == tx_idx:
 144                 continue
 145             self.chain.fetch_transaction(tx_in.previous_output.hash,
 146                 bitcoin.bind(self.load_input, bitcoin._1, bitcoin._2,
 147                     tx_in.previous_output.index, statement_line, info, tx_idx))
 148
 149     def load_input(self, ec, tx, index, statement_line, info, inputs_index):
 150         script = tx.outputs[index].output_script
 151         if script.type() == bitcoin.payment_type.pubkey_hash:
 152             pkh = bitcoin.short_hash(str(script.operations()[2].data))
 153             info["inputs"][inputs_index] = \
 154                 bitcoin.public_key_hash_to_address(pkh)
 155         else:
 156             info["inputs"][inputs_index] = "Unknown"
 157         if not [empty_in for empty_in in info["inputs"] if empty_in is None]:
 158             with statement_line.lock:
 159                 if info["is_in"] == 1:
 160                     statement_line.input_loaded = info
 161                 else:
 162                     statement_line.output_loaded = info
 163         self.finish_if_done()
 164
 165 def payment_history(chain, address, handle_finish):
 166     ph = PaymentHistory(chain)
 167     expiry_queue.add(ph)
 168     ph.run(address, handle_finish)
 169
 170 if __name__ == "__main__":
 171     def finish(result):
 172         print result
 173
 174     service = bitcoin.async_service(1)
 175     prefix = "/home/genjix/libbitcoin/database"
 176     chain = bitcoin.bdb_blockchain(service, prefix)
 177     address = "1FpES68UNcxnXeoaFciqvUSGiKGZ33gbfQ"
 178     print "Looking up", address
 179     payment_history(chain, address, finish)
 180     raw_input()
 181