import bitshares as bts

class SharedInstance():

instance = None

config = {}

def shared_bitshares_instance():

""" This method will initialize ``SharedInstance.instance`` and return it.

The purpose of this method is to have offer single default

bitshares instance that can be reused by multiple classes.

"""

if not SharedInstance.instance:

clear_cache()

SharedInstance.instance = bts.BitShares(**SharedInstance.config)

return SharedInstance.instance

def set_shared_bitshares_instance(bitshares_instance):

""" This method allows us to override default bitshares instance for all

users of ``SharedInstance.instance``.

:param bitshares.bitshares.BitShares bitshares_instance: BitShares

instance

"""

clear_cache()

SharedInstance.instance = bitshares_instance

def clear_cache():

""" Clear Caches

"""

from .blockchainobject import BlockchainObject

BlockchainObject.clear_cache()

def set_shared_config(config):

""" This allows to set a config that will be used when calling

``shared_bitshares_instance`` and allows to define the configuration

without requiring to actually create an instance

"""

assert isinstance(config, dict)

SharedInstance.config = config