plugins/exchange_rate.py

   1 from PyQt4.QtGui import *
   2 from PyQt4.QtCore import *
   3
   4 import decimal
   5 import httplib
   6 import json
   7 import threading
   8 import re
   9 from decimal import Decimal
  10 from electrum.plugins import BasePlugin
  11 from electrum.i18n import _
  12 from electrum_gui.qt.util import *
  13
  14
  15 class Exchanger(threading.Thread):
  16
  17     def __init__(self, parent):
  18         threading.Thread.__init__(self)
  19         self.daemon = True
  20         self.parent = parent
  21         self.quote_currencies = None
  22         self.lock = threading.Lock()
  23
  24     def exchange(self, btc_amount, quote_currency):
  25         with self.lock:
  26             if self.quote_currencies is None:
  27                 return None
  28             quote_currencies = self.quote_currencies.copy()
  29         if quote_currency not in quote_currencies:
  30             return None
  31         return btc_amount * quote_currencies[quote_currency]
  32
  33     def run(self):
  34         try:
  35             connection = httplib.HTTPConnection('blockchain.info')
  36             connection.request("GET", "/ticker")
  37         except:
  38             return
  39         response = connection.getresponse()
  40         if response.reason == httplib.responses[httplib.NOT_FOUND]:
  41             return
  42         try:
  43             response = json.loads(response.read())
  44         except:
  45             return
  46         quote_currencies = {}
  47         try:
  48             for r in response:
  49                 quote_currencies[r] = self._lookup_rate(response, r)
  50             with self.lock:
  51                 self.quote_currencies = quote_currencies
  52             self.parent.emit(SIGNAL("refresh_balance()"))
  53         except KeyError:
  54             pass
  55
  56     def get_currencies(self):
  57         return [] if self.quote_currencies == None else sorted(self.quote_currencies.keys())
  58
  59     def _lookup_rate(self, response, quote_id):
  60         return decimal.Decimal(str(response[str(quote_id)]["15m"]))
  61
  62
  63 class Plugin(BasePlugin):
  64
  65     def fullname(self):
  66         return "Exchange rates"
  67
  68     def description(self):
  69         return """exchange rates, retrieved from blockchain.info"""
  70
  71     def init(self):
  72         self.win = self.gui.main_window
  73         self.exchanger = Exchanger(self.win)
  74         self.win.connect(self.win, SIGNAL("refresh_balance()"), self.win.update_wallet)
  75         # Do price discovery
  76         self.exchanger.start()
  77         self.gui.exchanger = self.exchanger
  78
  79
  80     def set_quote_text(self, btc_balance, r):
  81         r[0] = self.create_quote_text(Decimal(btc_balance) / 100000000)
  82
  83     def create_quote_text(self, btc_balance):
  84         quote_currency = self.config.get("currency", "None")
  85         quote_balance = self.exchanger.exchange(btc_balance, quote_currency)
  86         if quote_balance is None:
  87             quote_text = ""
  88         else:
  89             quote_text = "%.2f %s" % (quote_balance, quote_currency)
  90         return quote_text
  91
  92
  93     def requires_settings(self):
  94         return True
  95
  96
  97     def settings_dialog(self):
  98         d = QDialog(self.win)
  99
 100         vbox = QVBoxLayout(d)
 101
 102         grid = QGridLayout()
 103         vbox.addLayout(grid)
 104
 105         currencies = self.exchanger.get_currencies()
 106         currencies.insert(0, "None")
 107
 108         cur_label=QLabel(_('Currency') + ':')
 109         grid.addWidget(cur_label , 2, 0)
 110         cur_combo = QComboBox()
 111         cur_combo.addItems(currencies)
 112         try:
 113             index = currencies.index(self.config.get('currency', "None"))
 114         except:
 115             index = 0
 116         cur_combo.setCurrentIndex(index)
 117         grid.addWidget(cur_combo, 2, 1)
 118         grid.addWidget(HelpButton(_('Select which currency is used for quotes.') + ' '), 2, 2)
 119
 120         vbox.addLayout(ok_cancel_buttons(d))
 121
 122         if d.exec_():
 123
 124             cur_request = str(currencies[cur_combo.currentIndex()])
 125             if cur_request != self.config.get('currency', "None"):
 126                 self.config.set_key('currency', cur_request, True)
 127                 self.win.update_wallet()
 128
 129
 130