Modify instances according to new pygraphene to allow setting config before instanciation (bitshares#188)

Author: xeroc

bitshares/instance.py

@@ -1,12 +1,22 @@
 # -*- coding: utf-8 -*-
-from graphenecommon.instance import AbstractBlockchainInstanceProvider, SharedInstance
+from graphenecommon.instance import AbstractBlockchainInstanceProvider
+
+
+class SharedInstance:
+    """ This class merely offers a singelton for the Blockchain Instance
+    """
+
+    instance = None
+    config = {}
 
 
 class BlockchainInstance(AbstractBlockchainInstanceProvider):
     """ This is a class that allows compatibility with previous
         naming conventions
     """
 
+    _sharedInstance = SharedInstance
+
     def __init__(self, *args, **kwargs):
         # Also allow 'bitshares_instance'
         if kwargs.get("bitshares_instance"):
@@ -33,11 +43,12 @@ def shared_blockchain_instance():
 
 def set_shared_blockchain_instance(instance):
     instance.clear_cache()
-    instance.set_shared_instance()
+    # instance.set_shared_instance()
+    BlockchainInstance.set_shared_blockchain_instance(instance)
 
 
 def set_shared_config(config):
-    shared_blockchain_instance().set_shared_config(config)
+    BlockchainInstance.set_shared_config(config)
 
 
 shared_bitshares_instance = shared_blockchain_instance