npyscreen - btce depth

npy-btce-depth.py

#!/usr/bin/env python
# encoding: utf-8

import npyscreen
import qbtce
import datetime

api = qbtce.API()

def parse_depth():
    depth = api.depth('btc_usd')['btc_usd']
    asks = []
    bids = []
    
    for ask in depth['asks']:
        price = "{:03.3f}".format(ask[0])
        quantity = "{:03.8f}".format(ask[1])
        asks.append(price + ' @ ' + quantity)

    for bid in depth['bids']:
        price = "{:03.3f}".format(bid[0])
        quantity = "{:03.8f}".format(bid[1])
        bids.append(price + ' @ ' + quantity)

    # additional information
    ltime = "Time: {time}".format(time=str(datetime.datetime.now()))
    best = "Bid: {bid:03.3f}, Ask: {ask:03.3f}".format(bid=depth['bids'][0][0], ask=depth['asks'][0][0])
    spread = "Spread: {:03.3f}".format(abs(depth['bids'][0][0] - depth['asks'][0][0]))
    return asks, bids, ltime, spread, best


class MainForm(npyscreen.Form):
    def while_waiting(self):
        (asks, bids, ltime, spread, best) = parse_depth()

        self.bidBox.values = bids
        self.askBox.values = asks
        self.info.values = [ltime, spread, best]
        
        # redraw
        self.display()

        # pause redraw for 5 seconds
        self.keypress_timeout = 50

    def create(self):
        # create boxes
        # adding editable=False, disables scroll on widgets.
        # but, it fixes bug with content being dissapeared when form is active.
        self.bidBox = self.add(npyscreen.BoxTitle, name="Market Bid", width=30, relx=15, height=20)
        self.askBox = self.add(npyscreen.BoxTitle, name="Market Ask", rely=2, relx=45, width=30, height=20)
        self.info = self.add(npyscreen.BoxTitle, name="Information", height=10)
        self.info.entry_widget.scroll_exit = True

class MainApp(npyscreen.NPSAppManaged):
    keypress_timeout_default = 50
    def onStart(self):
        self.addForm("MAIN", MainForm, name="BTC-E")        

if __name__ == "__main__":
    App = MainApp()
    App.run()