use TTLCache for get_ticker_history

freqtrade/exchange/__init__.py

@@ -4,6 +4,7 @@ from random import randint
 from typing import List, Dict, Any, Optional
 
 import arrow
+from cachetools import cached, TTLCache
 
 from freqtrade.exchange.bittrex import Bittrex
 from freqtrade.exchange.interface import Exchange
@@ -127,6 +128,7 @@ def get_ticker(pair: str) -> dict:
     return _API.get_ticker(pair)
 
 
+@cached(TTLCache(maxsize=100, ttl=30))
 def get_ticker_history(pair: str, tick_interval: Optional[int] = 5) -> List:
     return _API.get_ticker_history(pair, tick_interval)
 

freqtrade/exchange/bittrex.py

@@ -28,7 +28,7 @@ class Bittrex(Exchange):
         _API = _Bittrex(
             api_key=_EXCHANGE_CONF['key'],
             api_secret=_EXCHANGE_CONF['secret'],
-            calls_per_second=5,
+            calls_per_second=3,
         )
 
     @property

freqtrade/main.py

@@ -299,6 +299,7 @@ def main():
             time.sleep(1)
         elif new_state == State.RUNNING:
             _process()
+            time.sleep(5)
         old_state = new_state
 
 

requirements.txt

@@ -2,6 +2,7 @@
 SQLAlchemy==1.1.14
 python-telegram-bot==8.1.1
 arrow==0.10.0
+cachetools==2.0.1
 requests==2.18.4
 urllib3==1.22
 wrapt==1.10.11

setup.py

@@ -34,6 +34,7 @@ setup(name='freqtrade',
           'jsonschema',
           'TA-Lib',
           'tabulate',
+          'cachetools',
       ],
       dependency_links=[
           "git+https://github.com/ericsomdahl/python-bittrex.git@0.2.0#egg=python-bittrex"