Using python-bitshares without writing anything to disk #143
Description
Background:
I'm running python-bitshares on Google AppEngine, which doesn't allow writes to disk, causing exceptions because python-bitshares attempt to write the sqlite database to disk. This happens, even if BitShares() is initialized with keys: bitshares = BitShares(node=mynode, keys=[mykey])
Root Cause:
This line: self.config = kwargs.get("config_store", SqliteConfigurationStore(**kwargs)) (reference) is executed when a new BitShares() instance is created, resulting in disk writes.
This happens even if config_store is set while creating a new BitShares() instance like below:
from graphenestorage import InRamConfigurationStore
bitshares = BitShares(node=mynode, keys=[mykey], config_store=InRamConfigurationStore())
I suspect that kwargs.get() is causing this issue. For some reason it will call the default value even if another value is parsed to it (in this case SqliteConfigurationStore()). Once SqliteConfigurationStore() is called a folder will be created on disk (reference)
I'm not sure what the best way to fix this, I went with a quick hack:
bitshares = BitShares(node=node, keys=[app.config["WIF"]], config_store="ram")
and then patched sqlite.py (adding the first line below):
if kwargs.get("config_store", None) is None:
if os.path.isdir(data_dir): # pragma: no cover
print("checking folder")
return
else: # pragma: no cover
print("creating folder")
os.makedirs(data_dir)