initiate CI integration

Author: arik-so

.github/workflows/swift.yml

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+name: Continuous Integration Checks
+
+on: [ push, pull_request ]
+
+jobs:
+    check_bindings:
+        runs-on: ubuntu-20.04
+        env:
+            TOOLCHAIN: stable
+        steps:
+            -   name: Install native Rust toolchain, Valgrind, and build utilitis
+                run: |
+                    sudo apt-get update
+                    sudo apt-get -y dist-upgrade
+                    sudo apt-get -y install cargo valgrind lld git g++ clang curl
+            -   name: Checkout source code
+                uses: actions/checkout@v2
+            -   name: Install cbindgen
+                run: cargo install --force cbindgen
+            -   name: Checkout Rust-Lightning and LDK-C-Bindings git
+                run: |
+                    git config --global user.email "[email protected]"
+                    git config --global user.name "LDK CI"
+                    # Note this is a different endpoint, as we need one non-upstream commit!
+                    git clone https://git.bitcoin.ninja/rust-lightning
+                    cd rust-lightning
+                    git checkout origin/2021-03-java-bindings-base
+                    cd ..
+                    git clone https://github.com/lightningdevkit/ldk-c-bindings
+            -   name: Install Swift Toolchain
+                run: |
+                    curl https://swift.org/builds/swift-5.4.2-release/ubuntu2004/swift-5.4.2-RELEASE/swift-5.4.2-RELEASE-ubuntu20.04.tar.gz > swift-5.4.2-RELEASE-ubuntu20.04.tar.gz
+                    if [ "$(sha256sum swift-5.4.2-RELEASE-ubuntu20.04.tar.gz | awk '{ print $1 }')" != "86b849d9f6ba2eda4e12ea5eafaa0748bffcd6272466b514c2b0fd4a829c63a4" ]; then
+                      echo "Bad hash"
+                      exit 1
+                    fi
+                    tar xvvf swift-5.4.2-RELEASE-ubuntu20.04.tar.gz
+            -   name: Rebuild C bindings
+                run: |
+                    cd ldk-c-bindings
+                    ./genbindings.sh ../rust-lightning true
+                    cd ..
+            -   name: Copy new headers into bindings
+                run: |
+                    cp ldk-c-bindings/lightning-c-bindings/include/*.h ci/LDKCHeaders/Headers/
+                    cp ldk-c-bindings/ldk-net/ldk_net.h ci/LDKCHeaders/Headers/
+            -   name: Fix header files
+                run: |
+                    python ci/fix_header_includes.py
+            -   name: Copy Swift bindings into sources
+                run: |
+                    cp -a bindings/LDK/. ci/LDKSwift/Sources/LDKSwift
+                    cp -R bindings/batteries ci/LDKSwift/Sources/LDKSwift
+            -   name: Build and test bindings
+                run: |
+                    cd ci/LDKSwift
+                    LDK_C_BINDINGS_BASE="../ldk-c-bindings" RUST_BACKTRACE=1 ../swift-5.4.2-RELEASE-ubuntu20.04/usr/bin/swift test
+            -   name: Check that the latest headers are in the swift repo
+                run: |
+                    git diff --exit-code

ci/fix_header_includes.py

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+import os
+
+directory_path = os.path.dirname(os.path.realpath(__file__))
+header_directory = f'{directory_path}/LDKCHeaders/Headers'
+
+header_files = []
+
+# Create a collection of local header files
+for current_header_file in os.listdir(header_directory):
+	current_file_path = f'{header_directory}/{current_header_file}'
+	if not os.path.isfile(current_file_path):
+		continue
+	if not current_header_file.endswith('.h'):
+		continue
+
+	header_files.append({'name': current_header_file, 'path': current_file_path})
+
+for current_header_file in header_files:
+	file_name = current_header_file['name']
+	path = current_header_file['path']
+	file_in = open(path, 'rt')
+	original_contents = file_in.read()
+	file_in.close()
+
+	fixed_contents = original_contents
+	for other_header_file in header_files:
+		other_file_name = other_header_file['name']
+		if other_file_name == file_name:
+			continue
+		# TODO: use regex to detect multi-space or other whitespace-altered includes and fix them correctly, too
+		# Fix each local file's import by replacing angular brackets with quotes
+		fixed_contents = fixed_contents.replace(f'#include <{other_file_name}>', f'#include "{other_file_name}"')
+	if fixed_contents != original_contents:
+		# Only save updated file if a change occurred
+		file_out = open(path, 'wt')
+		file_out.write(fixed_contents)
+		file_out.close()
+