joinmarket-clientserver/docs/TODO.md

This will serve as a high level overview of future changes either in progress or planned. The Issues list is for specific bugs or feature requests.

Python

• PEP8 compliance.
• Details which may or may not be included in PEP8 might be, consistent variable naming conventions, and use of single/double quotes.
• Porting to Python 3.

A note on the above - took a look at it last December, but had problems in particular with some twisted elements, specifically txsocksx

• Twisted related: there are cases where much better use of deferreds should be possible.

Testing

• Find a correct model for tests using twisted; current arch. used in test_client_protocol.py (and daemon) is extremely ugly, involving hardcoded timeouts. It uses twisted.trial which I believe(?) is the correct module to use, but I don't seem to have figured out the right/best way to use it.
• Rewrites for several tests needed; in particular, blockchaininterface, segwit, transaction creation generally.
• Current test/ygrunner.py is a nice way to do "by-hand" testing of various clients against either honest or malicious counterparties (makers). Can and should be extended to be automatic, with taker running in same process.
• Issues of running bots in parallel in tests: sourcing the configuration, and sharing of global files like commitmentlist.

Architecture

• Probably move all user data to ~ ; see comment.
• Make use of the schedule design to fold together sendpayment and tumbler (they share a lot of cli options anyway).
• Investigate what refactoring of the daemon protocol is necessary so it is possible to run protocol instances concurrently.
• Moving elements shared into joinmarketbase - in particular, an object representing offers like JMOffer, which could have serialization routines for passing between client and daemon.
• Do more work on TLS connection so that it becomes possible to run the daemon locally without any privacy concern (there is already no bitcoin security concern even without it).

Blockchain

• We should look into lite-client modes, in particular client-side filtering as used by Neutrino and others, and described [here](https://github.com/Roasbeef/bips/blob/master/gcs_light_client.mediawiki}.

• Re-work the existing electrum code so it works reliably and with some decent performance (easier short term goal). (Done)

Joinmarket protocol

• The issue693 problem is by far the most important one to spend time on.

Qt GUI

• Binary build process automated and, more importantly, working for Linux, Windows and Mac.

There is no current process for building binaries on Mac or Windows (theoretically the latter is possible but a mess, so I'm not doing it).

Alternative implementations

• Build an alternative client implementation in Java or Javascript for example, using some existing Bitcoin library in that language, perhaps using some lite client solution e.g. SPV, and then connecting to the daemon (executable or Python script).

Bitcoin

• Several related concepts here: 1/ switching to Peter Todd's python-bitcoinlib, but want good backend i.e. libsecp256k1 binding. 2/ coincurve of Ofek looks like a better (and better-maintained) option than secp256k1-py, so ideally put that behind python-bitcoinlib. 3/ Also doing all this without Python3 usage doesn't seem to make much sense.