def execute(self, exchange, key):
"""Search the ticker response recursively for the key specified
Args:
exchange (OBJECT): Exchange object
Returns:
FLOAT: Value for the key specified
"""
res = None
# Request the ticker and get the HTTP response
response = get_ticker_response(exchange)
if response:
# Deserialize the response content
data = self._deserialize(response)
if data:
# If the route to key is set on the exchange configuration
if exchange.route:
route = exchange.route
route = route.split(",")
res = self._search_by_key_route(data, *route)
# If the route is not set then search for the key directly
else:
res = self._search_by_key(data, key)
return res
def get_graphs():
"""
Store graph data in database to be used later by the graphs API
"""
# List of exchanges to store values for a candlesticks graph
candlesticks_exchanges = ['Bitstamp']
for exchange in active_exchanges():
ticker = exchange.url + exchange.api
subject = '[ERROR] %s exchange (GRAPH)' % exchange.name
error_msg = "Exchange: %s\nTicker: %s\nException: " % (exchange.name,
ticker)
try:
last = opn = high = low = close = volume = None
last = exchange.get_value(exchange.key_last)
# Close session opened after the execution of get_value method
db.session.close()
if exchange.name in candlesticks_exchanges:
# Get the open value (the first value of the day)
opn, buy, trend = get_alternate_value(exchange,
position='first')
# Get ticker to obtain additional values to show in graph
response = get_ticker_response(exchange)
if opn and response:
# Serialize ticker response
json = loads(response.content)
close = json['last'] or None,
high = json['high'] or None,
low = json['low'] or None,
volume = float(json['volume']) or None,
except ConnectionError:
if not last:
previous = get_alternate_value(exchange, position='previous')
if previous:
last = previous[0]
excep = 'Error connecting with API. Using previous value.'
if app.config.get('ENABLE_MAIL_NOTIFICATIONS', False):
send_async_email(subject, error_msg + excep)
else:
excep = 'Error connecting with API. No previous value get.'
if app.config.get('ENABLE_MAIL_NOTIFICATIONS', False):
send_async_email(subject, error_msg + excep)
print subject + ': ' + excep
except Exception as err:
print subject + ': ' + str(err.message)
if app.config.get('ENABLE_MAIL_NOTIFICATIONS', False):
send_async_email(subject, error_msg + str(err.message))
finally:
try:
# Write obtained values to database
graph = Graph(
exchange_id=exchange.id,
last=last,
opn=opn,
close=close,
high=high,
low=low,
volume=volume,
date=date.today(),
time=datetime.now().time()
)
if graph.last:
print "Getting graph data for '%s'" % exchange.name
db.session.add(graph)
else:
raise Exception
except Exception as err:
if not err.message:
err.message = 'Connection Error. Ticker API is down.'
print subject + ': ' + str(err.message)
if app.config.get('ENABLE_MAIL_NOTIFICATIONS', False):
send_async_email(subject, error_msg + str(err.message))
finally:
db.session.commit()
db.session.close()
