Refactoring backends submodule

[jeffro256]

Motivation:
backends.jsonrpc was already probably longer than it needed to be. I split
up the logic for JSONRPCDaemon and JSONRPCWallet in order to increase readibility.
This will be especially important in the future as more backends are written.
In particular, an issue (#73) is currently open which suggests adding MyMonero
API support. If this is added, it might be worth also adding the OpenMonero API.
Both of these are JSON RPC APIs, but I think it wouldn't necesarily make a lot
of sense to put these all into the same file so I went ahead and split the backends
up. Also, because of the default backends PR (#79), to the most basic of users, it
will matter much less how the backends are named, if you chose to take issue with
my naming. I hope this PR is useful for future development!

Changes:
1. Moved JSONRPCDaemon to backends.rpcdaemon
2. Moved JSONRPCWallet to backends.rpcwallet
3. Moved jsonrpc exceptions to backends.rpcexceptions
4. monero.backends.jsonrpc now only imports the backends and exceptions
5. Edited test files accordingly

Notes:
* This change is backwards compatible

[jeffro256]

Sorry about all the PR confusion, git merges are hard apparently ;). This is the one I'm requesting at the moment.

[emesik]

Splitting the file is a good idea but you also have introduced backward-incompatible namespace change. All module users would have to modify their imports.

The backend coul still live under monero.backends.jsonrpc, even after the split. Additional backends could land in monero.backends.mymonero or monero.backends.openmonero, etc.

[jeffro256]

Sorry if I do not understand but I'm 90% sure that this change is backwards compatible unless there is something I missed. Any library user can still import JSONRPCDaemon or JSONRPCWallet by doing the following:

from monero.backends.jsonrpc import JSONRPCDaemon, JSONRPCWallet

This is because jsonrpc.py now only contains the lines:

from .rpcdaemon import JSONRPCDaemon
from .rpcexceptions import RPCError, Unauthorized, MethodNotFound
from .rpcwallet import JSONRPCWallet

[emesik]

We may have two different approaches there:

1. To just reduce the size of the file, the backend may go into a dir backends/jsonrpc/ which contains:
   __init__.py
daemon.py (contains JSONRPCDaemon)
   wallet.py (contains JSONRPCWallet)
   exceptions.py (contains those 3 exceptions)
   Then __init__.py imports from internal files to keep structure and allow imports like they were before (100% backward-compatible).

2. Actually split the backend in two, backends/jsonrpcdaemon.py and backends/jsonrpcwallet.py for the reason a backend may not neccesarily implement both daemon and wallet functionality (for example, mymonero/openmonero will not). Then provide some glue to keep backward-compatible imports.

IIUC, you have chosen the latter option. However, I find that solution a bit confusing and I think it pollutes namespace under backends/. Have I understood it correctly? Is it what you actually meant? Perhaps I'm missing something.

[emesik]

#82 shows what I mean by variant 1.

[jeffro256]

Yeah that seems to accomplish the same goal while being cleaner. I like it !

…

On Tue, Jan 19, 2021 at 19:16 Michał Sałaban ***@***.***> wrote: #82 <#82> shows what I mean by variant 1. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#81 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACSWLOWX5HUZZAA2JEASZZTS2YVFPANCNFSM4WIMEVAA> .

[emesik]

Good, I'm closing it then.