futurepaul / fluttermint

fluttermint

A Fedimint wallet in Flutter + Rust. DO NOT USE WITH (serious amounts of) REAL MONEY! This is for tinkering, only.

To try Fluttermint, download Android APK or join iOS Testflight. Use this signet faucet to play with the app with fake bitcoin.

See DEVELOPING.md for notes about contributing to Fluttermint.

fluttermint's Issues

Sharing invoice includes `lightning:` prefix

Normally this is bad practice and it should just share the invoice

Could not acquire lock

We've only observed this on MacOS target so far:

[ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: FfiException(RESULT_ERROR, IO error: could not acquire lock on "/Users/futurepaul/Library/Containers/com.example.fluttermint/Data/Documents/client.db/db": Os { code: 35, kind: WouldBlock, message: "Resource temporarily unavailable" }, null)
#0      FlutterRustBridgeBase._transformRust2DartMessage (package:flutter_rust_bridge/src/basic.dart:89:9)
#1      FlutterRustBridgeBase.executeNormal.<anonymous closure> (package:flutter_rust_bridge/src/basic.dart:45:9)
#2      _rootRunUnary (dart:async/zone.dart:1434:47)
#3      _CustomZone.runUnary (dart:async/zone.dart:1335:19)
<asynchronous suspension>
#4      MinimintClientImpl.joinFederation (package:fluttermint/ffi.dart:34:5)
<asynchronous suspension>
#5      SetupJoin.build.joinFederation (package:fluttermint/screens/setup_join.dart:28:7)
<asynchronous suspension>

Revisit this commit

Might want to display something clearer when we can't display a balance. Or make is such that this screen cannot be shown if there isn't a balance to show.

2cd8a0c

Setup CI

It will be easy for Rust, but i am not sure about flutter/dart.

Play Store warning about debug symbols

Consider `android_logger` crate

https://docs.rs/android_logger/latest/android_logger/

"Oops, something unexpected happened"

Obi and Eric got this on first load. I think this is because they had installed old APK and the database conflicted. Would be interesting to try to replicate this by installing old APK and then installing new APK.

Perhaps we could handle failures to load the database and present a more understandable error. Since we don't support migrations yet, we wouldn't have any option other than offering to delete the database and start over ...

Balance not showing correctly.

I got 69 sats from the faucet however my balance is not updated.

I tried going to the receive tab and creating a new invoice and that did not update my balance.

Minor note: the Paid is confusing for a receive. Not sure if I was paid or if I paid someone else.

`Stream` events from rust to dart

Use Stream to send events from rust to dart

Spend (via sigpay.sirion.io): Invoice expired but fm-sats deducted

Reported by @yojoe in fedimint repo. Moving here because it's a client-side problem.

Everytime I spend fm-sats to pay sigpay.sirion.io invoices, the fm-sats are immediately deducted from my fluttermint wallet, but never seem to reach the BTCPay Server (sigpay.sirion.io). How is that even possible? I thought the LN Gateway can only redeem the fm-sats once it received the payment hash from the target (BTCPay Server)?

Poll invoices we have generated to detect incoming payments

Should we do this in minimint-bridge or should something like UserClient provide this?

Eventually we should just subscribe to a websocket or something. But initially we'll probably do polling ...

add tooltips

tooltips are a combination of state and custom widgetry:

they need to be controlled by some sort of global state that keeps track if they've been shown yet

there's a tooltip widget in flutter but it's not customizable enough to work for our purposes I believe. will need a way of positioning without breaking the existing layout

I started on the visual of this widget here: https://github.com/futurepaul/fluttermint/blob/master/lib/widgets/fedi_tooltip.dart

"compliance missing"

Currently when I make a testflight submission, I

Here's a stackoverflow issue discussing the issue.

We need to revisit this before submitting to the real app store.

Deploy to app stores

Remove clearnet support

Probably don't want this long-term <application android:debuggable="true" android:usesCleartextTraffic="true" />

Save things on Flutter side

IIRC there was some api for storing "settings" type data that we could use? @futurepaul

The main one we need to save right now is client.json containing all information needed to talk to the federation.

But I think there will be more user preferences (e.g. language, do they prefer BTC or sats, etc)

Invoice serialization

Use serde_json to serialize invoices instead of bespoke MyInvoice hack

Remove the MacOS build

When we were settting up the project I think we accidentally accepted MacOS as a build target. We will never build for MacOS. Remove it.

Reproducible builds

Replace qr_code_scanner with mobile_scanner

According to https://pub.dev/packages/qr_code_scanner:

Since the underlying frameworks of this package, zxing for android and MTBBarcodescanner for iOS are both not longer maintaned, this plugin is no longer up to date and in maintenance mode only. Only bug fixes and minor enhancements will be considered.

I am developing a new plugin mobile_scanner that uses the latest version of MLKit for detecting barcodes and QR codes. On Android it also uses the latest version of CameraX, and on iOS the native AVFoundation for best camera performance.

Also mobile_scanner supports macOS which is not supported by qr_code_scanner

Scanning non-lightning QR codes gives weird errors

If you scan a qr that isn't a lightning invoice or doesn't start with lightning: (from what i've tested), it gives you bech32 errors. If you scan a valid bech32 string (ie bitcoin address) you get a length error

nested runtimes?

this happens on ios and android in the receive screen. it seems new so it might be a regression in #66

flutter: checking status for lntbs420n1p3jhky8dqqpp5mpyndj0g4qqpw8uh4gdrytq94ae78zspejghhqcxhrnwcx2558dqsp56rhyn922tv9dgdkaayr2cn22je3xxd9kd0seejpmv0k4g45gme4s9qrsgqcqpjnp4q2a2dkse398yryr3ec94lq0aa80ru3m6gzqchjqx2gvg3rmmcvu5jrzjqvrj8qfkcjxdx5yycnh6m3yxzsa8azn6ek8l3tq98ldtfmatc4gugqqqqqqqqqqqpqqqqqqqqqqqqqqqrcrscjagg7sxlez5ppdfne6vs2dc7l49ckvflaq59hgjs0sv90fdzxf4rm98h90qrvueyqj2pdpkvcpm9hfk2j3cepled63lg4v7srflgqwthk28
thread 'frb_executor' panicked at 'Cannot start a runtime from within a runtime. This happens because a function (like `block_on`) attempted to block the current thread while the thread is being used to drive asynchronous tasks.', /Users/futurepaul/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.1/src/runtime/scheduler/multi_thread/mod.rs:78:25
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
flutter: Caught error: FfiException(PANIC_ERROR, Cannot start a runtime from within a runtime. This happens because a function (like `block_on`) attempted to block the current thread while the thread is being used to drive asynchronous tasks., null)

[Feature] Previous Transactions

Would be nice to be able to display the previous transactions that had occurred,

I'm assuming we would need to store the spent and unspent mints somewhere on the device?

Not sure if we've setup any sort of database yet

tap balance display to change denomination

should be wired up to some global state

Better flutter error handling

fzyzcjy/flutter_rust_bridge#582

Would be great for that to be merged. Maybe we should finish it off.

Higher level error handling

Paul was mentioning that Flutter was failing to catch rust errors high in the component hierarchy, so we ended up just handling errors directly where we called the rust bridge.

Deploy on WASM

@Maan2003 has a branch for this https://github.com/Maan2003/fluttermint/tree/wasm

background gradient for textboxes

I customized a text field here not too hard:
https://github.com/BitcoinDevShop/pln/blob/master/mobile/lib/widgets/text_field.dart

July 18

Some notes as I try to get the app running again:

• Ended up using MemDatabase on iOS because I was getting an error that filesystem was read-only.
• server-n.json
  • Only stores the hbbft ports of their peers. They don't have the websocket ports. I needed connection.replace("400", "500") to get it working ...
  • Has 127.0.0.1 for all host names. Would be better if it had actual IP addresses ...
• There's a strange issue on Android where the camera shows up the first time app is loaded in fresh simulator, but every subsequent time the camera is just black. Wonder if this is a problem for our QR library, or just a simulator problem. Haven't tried running on android device yet.
• Would be nice if tmuxinator.sh could use ./cfg so that state isn't lost when we exit. Also need a way to detach from tmux. Can't figure out how to do that right now.

Only have 1 global variable in minimint-bridge

Currently we have 3 globals in minimint-bridge. We should only have 1.

DB not getting saved properly

From @elsirion:

Seems the app doesn't always save the DB? Closed it and lost the last tx in the list. Validated by spending all coins and there being a double spend.

Can't do HTTPS