Wasabi Daemon

[lontivero]

Vision

We are really far from that vision but it is possible to achieve something not so ambitious with relatively low effort by simply separating the UI from the rest of the wallet allowing us to have a process with a smaller footprint in memory and cpu while at the same time would make easier (to swallow) to start it with the OS.

Questions

• What this is about?

This is about having a headless wasabi process that can be started from command line with parameters.

• Is wasabi going to have a RPC (or similar) remote api to have access to all the services/features? Can it be used to create multiple different UIs?

No. That's completely out of the scope. But it would be easier to do in the future ofc once we have a daemon processes.

• What about the current RPC?

It should remain untouched. From the technical point of view however, it should be moved from the UI (where currently it is) to the daemon project (where makes more sense).

• What do you mean by relatively low effort?

I say low effort because in some sense the UI is already separated in projects:

• WalletWasabi.Fluent/
• WalletWasabi.Fluent.Desktop/
• WalletWasabi.Fluent.Generators/

That means that a new WalletWasabi.Daemon would be pretty similar to WalletWasabi.Fluent.Desktop (which is a one-file project) except that it shouldn't launch the UI and should process a different set commands. For example, it cannot process the crashreport argument nor the -url argument (if implemented).

Challenges

Single instance checker.

The SIC is designed under the assumption that there is only one project: the Desktop project. I assume the daemon will be used by very few people (it is headless after all) and then it doesn't worth the effort to make the SIC more complex to handle very edge cases.

How to start

WalletWasabi.Daemon could be used as the template for the Daemon project but its Program.cs (the only file in that project) its a little messy so, it would be good to clone the project, make it work and then extract the common code (a few tends of LoC) to a WasabiApp class or similar.

[Pule08]

the PR of the daemon:
#10293