From 26504044a64d28603056411b60627272da2aa357 Mon Sep 17 00:00:00 2001
From: Thierry Deruyttere <thierryderuyttere@hotmail.com>
Date: Thu, 5 Oct 2017 16:31:23 +0200
Subject: [PATCH] Added timer for api call rate limit (#56)

* added timer

* naming

* forgot old var
---
 bittrex/bittrex.py | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/bittrex/bittrex.py b/bittrex/bittrex.py
index 68cc9ac..6ad6a4b 100644
--- a/bittrex/bittrex.py
+++ b/bittrex/bittrex.py
@@ -75,10 +75,12 @@ class Bittrex(object):
     """
     Used for requesting Bittrex with API key and API secret
     """
-    def __init__(self, api_key, api_secret, dispatch=using_requests):
+    def __init__(self, api_key, api_secret, calls_per_second=1, dispatch=using_requests):
         self.api_key = str(api_key) if api_key is not None else ''
         self.api_secret = str(api_secret) if api_secret is not None else ''
         self.dispatch = dispatch
+        self.call_rate = 1.0/calls_per_second
+        self.last_call = None
 
     def decrypt(self):
         if encrypted:
@@ -96,6 +98,18 @@ def decrypt(self):
         else:
             raise ImportError('"pycrypto" module has to be installed')
 
+    def wait(self):
+        if self.last_call is None:
+            self.last_call = time.time()
+        else:
+            now = time.time()
+            passed = now - self.last_call
+            if passed < self.call_rate:
+                #print("sleep")
+                time.sleep(1.0 - passed)
+
+            self.last_call = time.time()
+
     def api_query(self, method, options=None):
         """
         Queries Bittrex with given method and options.
@@ -128,6 +142,9 @@ def api_query(self, method, options=None):
         apisign = hmac.new(self.api_secret.encode(),
                            request_url.encode(),
                            hashlib.sha512).hexdigest()
+
+        self.wait()
+
         return self.dispatch(request_url, apisign)
 
     def get_markets(self):