Uniffi dart (#829)

This adds support for producing dart bindings with uniffi via
https://github.com/Uniffi-Dart/uniffi-dart.git (pinned commit for now
until official releases exist). The unit and integration tests in dart
are passing.

Note that the integration test is currently flaky due to issues with
`testcontainers`, so the dart Github workflow is not introduced in this
PR to keep CI reliably passing. #876 adds the workflow separately but
should wait until the `testcontainers` issue is resolved.

Author: spacebear21

payjoin-ffi/Cargo.toml

@@ -8,7 +8,7 @@ exclude = ["tests"]
 [features]
 _test-utils = ["payjoin-test-utils", "tokio", "bitcoind"]
 _danger-local-https = ["payjoin/_danger-local-https"]
-uniffi = ["uniffi/cli", "bitcoin-ffi/default"]
+uniffi = ["uniffi/cli", "bitcoin-ffi/default", "uniffi-dart"]
 
 [lib]
 name = "payjoin_ffi"
@@ -20,6 +20,7 @@ path = "uniffi-bindgen.rs"
 
 [build-dependencies]
 uniffi = { version = "0.29.1", features = ["build"] }
+uniffi-dart = { git = "https://github.com/Uniffi-Dart/uniffi-dart.git", rev = "b6186bc", features = ["build"] }
 
 [dependencies]
 base64 = "0.22.1"
@@ -35,6 +36,7 @@ serde_json = "1.0.128"
 thiserror = "1.0.58"
 tokio = { version = "1.38.0", features = ["full"], optional = true }
 uniffi = { version = "0.29.1", optional = true }
+uniffi-dart = { git = "https://github.com/Uniffi-Dart/uniffi-dart.git", rev = "b6186bc", optional = true}
 url = "2.5.0"
 
 [dev-dependencies]

payjoin-ffi/build.rs

@@ -1,4 +1,6 @@
 fn main() {
     #[cfg(feature = "uniffi")]
     uniffi::generate_scaffolding("src/payjoin_ffi.udl").unwrap();
+    #[cfg(feature = "uniffi")]
+    uniffi_dart::generate_scaffolding("src/payjoin_ffi.udl".into()).unwrap();
 }

payjoin-ffi/dart/.gitignore

@@ -0,0 +1,15 @@
+.dart_tool/
+build/
+pubspec.lock
+doc/api/
+
+.DS_Store
+
+# Auto-generated shared libraries
+*.dylib
+*.so
+*.dll
+
+# Auto-generated bindings
+lib/payjoin_ffi.dart
+lib/bitcoin.dart

payjoin-ffi/dart/pubspec.yaml

@@ -0,0 +1,12 @@
+name: payjoin_dart
+description: Dart bindings for payjoin
+version: 0.24.0
+
+environment:
+  sdk: '^3.2.0'
+
+dependencies:
+  ffi: ^2.1.4
+dev_dependencies:
+  test: ^1.26.2
+  http: ^1.4.0

payjoin-ffi/dart/scripts/bindgen_generate.sh

@@ -0,0 +1,11 @@
+
+
+#!/bin/bash
+chmod +x ./scripts/generate_linux.sh
+chmod +x ./scripts/generate_macos.sh
+
+
+# Run each script
+scripts/generate_linux.sh
+scripts/generate_macos.sh
+

payjoin-ffi/dart/scripts/generate_linux.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+LIBNAME=libpayjoin_ffi.so
+LINUX_TARGET=x86_64-unknown-linux-gnu
+
+echo "Generating payjoin_ffi.dart..."
+cd ../
+# This is a test script the actual release should not include the test utils feature
+cargo build --profile release --features uniffi,_test-utils
+cargo run --profile release --features uniffi,_test-utils --bin uniffi-bindgen -- --library target/release/$LIBNAME --language dart --out-dir dart/lib/
+
+echo "Generating native binaries..."
+rustup target add $LINUX_TARGET
+# This is a test script the actual release should not include the test utils feature
+cargo build --profile release-smaller --target $LINUX_TARGET --features uniffi,_test-utils
+
+echo "Copying linux payjoin_ffi.so"
+cp target/$LINUX_TARGET/release-smaller/$LIBNAME dart/$LIBNAME
+
+echo "All done!"

payjoin-ffi/dart/scripts/generate_macos.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+LIBNAME=libpayjoin_ffi.dylib
+
+echo "Generating payjoin_ffi.dart..."
+cd ../
+# This is a test script the actual release should not include the test utils feature
+cargo build --features uniffi,_test-utils --profile release
+cargo run --features uniffi,_test-utils --profile release --bin uniffi-bindgen -- --library target/release/$LIBNAME --language dart --out-dir dart/lib/
+
+echo "Generating native binaries..."
+rustup target add aarch64-apple-darwin x86_64-apple-darwin
+
+# This is a test script the actual release should not include the test utils feature
+cargo build --profile release-smaller --target aarch64-apple-darwin --features uniffi,_test-utils
+echo "Done building aarch64-apple-darwin"
+
+# This is a test script the actual release should not include the test utils feature
+cargo build --profile release-smaller --target x86_64-apple-darwin --features uniffi,_test-utils
+echo "Done building x86_64-apple-darwin"
+
+echo "Building macos fat library"
+
+lipo -create -output dart/$LIBNAME \
+        target/aarch64-apple-darwin/release-smaller/$LIBNAME \
+        target/x86_64-apple-darwin/release-smaller/$LIBNAME
+
+echo "All done!"