chore: use install executable to obtain libpact

.codecov.yml

@@ -0,0 +1,5 @@
+coverage:
+  status:
+    patch:
+      default:
+        target: 80%

.github/workflows/ci.yml

@@ -23,8 +23,14 @@ jobs:
       - uses: dart-lang/setup-dart@v1
       - name: Install dependencies
         run: dart pub get
+      - name: Obtain libpact
+        run: dart run pact_dart:install
+        env:
+          PACT_DART_LIB_DOWNLOAD_PATH: .
       - name: Run unit tests
         run: dart test --coverage="coverage" test/
+        env:
+          PACT_DART_LIB_DOWNLOAD_PATH: .
       - name: Format coverage
         run: dart run coverage:format_coverage --lcov --in=coverage --out=coverage.lcov --packages=.packages --report-on=lib
       - uses: codecov/codecov-action@v2

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.0
+
+- chore: use install executable to obtain libpact
+
 ## 0.2.0
 
 - feat: implement dsl for creating pact matchers

README.md

@@ -9,14 +9,11 @@ This library provides a Dart DSL for generating Pact contracts. It implements [P
 
 ### Installation
 
-Simply, install the package using `pub`:
-
 ```bash
 dart pub add pact_dart
+dart run pact_dart:install
 ```
 
-Currently, the `libpact_ffi` dependency is included for x86_64 macOS, Linux and Windows.
-
 ### Example
 
 ```dart

bin/install.dart

@@ -0,0 +1,65 @@
+/// Dart has no way to install native libraries during package installation
+///
+/// Something to keep an eye on: https://github.com/dart-lang/pub/issues/39
+import 'dart:io';
+import 'package:http/http.dart' as http;
+import 'package:path/path.dart' as path;
+
+String getPlatformFileType() {
+  switch (Platform.operatingSystem) {
+    case 'macos':
+      return 'dylib';
+
+    case 'linux':
+      return 'so';
+
+    case 'windows':
+      return 'dll';
+
+    default:
+      throw UnsupportedError(
+          'Sorry! ${Platform.operatingSystem} is unsupported by pact_dart.');
+  }
+}
+
+String getLibDirectory() {
+  final env = Platform.environment['PACT_DART_LIB_DOWNLOAD_PATH'];
+  if (env != null && env.isNotEmpty) {
+    return env;
+  }
+
+  return '/usr/local/lib';
+}
+
+Uri generateDependencyLink(String name, String version, String fileType) {
+  final operatingSystem =
+      Platform.operatingSystem == 'macos' ? 'osx' : Platform.operatingSystem;
+
+  final path =
+      '/pact-foundation/pact-reference/releases/download/$name-v$version/$name-$operatingSystem-x86_64.$fileType.gz';
+
+  return Uri(scheme: 'https', host: 'github.com', path: path);
+}
+
+Future<void> downloadDependency(String name, String version) async {
+  final fileType = getPlatformFileType();
+  final dependencyLink = generateDependencyLink(name, version, fileType);
+
+  final res = await http.get(dependencyLink);
+  final library = GZipCodec().decode(res.bodyBytes);
+
+  final libDir = getLibDirectory();
+  final libPath = path.join(libDir, '$name.$fileType');
+
+  final writeStream = File(libPath.toString()).openWrite();
+  writeStream.add(library);
+
+  await writeStream.close();
+}
+
+void main() async {
+  final dependencyName = Platform.isWindows ? 'pact_ffi' : 'libpact_ffi';
+  final dependencyVersion = '0.0.1';
+
+  await downloadDependency(dependencyName, dependencyVersion);
+}

lib/src/ffi/dylib.dart

@@ -2,20 +2,29 @@ import 'dart:io';
 import 'dart:ffi';
 import 'package:path/path.dart' as path;
 
-String getlibraryName() {
+String getLibDirectory() {
+  final env = Platform.environment['PACT_DART_LIB_DOWNLOAD_PATH'];
+  if (env != null && env.isNotEmpty) {
+    return env;
+  }
+
+  return '/usr/local/lib';
+}
+
+String getLibName() {
   if (Platform.isLinux) {
-    return 'libpact_ffi-linux-x86_64.so';
+    return 'libpact_ffi.so';
   }
-  if (Platform.isMacOS) return 'libpact_ffi-osx-x86_64.dylib';
-  if (Platform.isWindows) return 'pact_ffi-windows-x86_64.dll';
+  if (Platform.isMacOS) return 'libpact_ffi.dylib';
+  if (Platform.isWindows) return 'pact_ffi.dll';
 
   throw Exception('Package does not support the current platform');
 }
 
 DynamicLibrary openLibrary() {
-  final libraryName = getlibraryName();
-  final libraryPath =
-      path.join(Directory.current.path, 'dependencies', libraryName);
+  final name = getLibName();
+  final libDir = getLibDirectory();
+  final libPath = path.join(libDir, name);
 
-  return DynamicLibrary.open(libraryPath);
+  return DynamicLibrary.open(libPath);
 }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: pact_dart
 description: A Dart DSL for creating pact contracts
-version: 0.2.0
+version: 0.3.0
 homepage: https://github.com/matthewshirley/pact_dart
 
 environment:
@@ -15,3 +15,5 @@ dev_dependencies:
   http: ^0.13.3
   pedantic: ^1.10.0
   test: ^1.17.10
+executables:
+  install: