AppStream Parser - Flathub Catalog to SQLite

A high-performance C++23 FFI bridge for parsing Flathub AppStream metadata into SQLite databases, with Dart bindings for cross-platform access.

📋 Quick Facts

• Language: C++23 (backend) + Dart (frontend) + C (Dart API)
• Status: ✅ Production-Ready (v0.2.0)
• Tests: 185/185 passing ✅ (140 C++ + 45 Dart)
• Security: 0 CVEs ✅
• Code Quality: No lint/format issues ✅

🚀 Features

Core Capabilities

• ✅ High-Performance XML Parsing - Custom XmlScanner (~45ms for 1000 components)
• ✅ Streaming Pipeline - XML → SQLite direct pipeline (~190ms for 1000 components)
• ✅ String Interning - Efficient memory usage with StringPool
• ✅ Multi-Language Support - Tested with 5 languages (en, de, fr, es, ja)
• ✅ Real Flathub Data - Tests with actual Flathub apps (GNOME, Firefox, GIMP, etc.)

Infrastructure (Enterprise-Grade)

• ✅ Automated CI/CD - GitHub Actions with 8+ configurations
• ✅ Code Coverage - gcov/lcov integration + Codecov
• ✅ Performance Tracking - 8 benchmark scenarios
• ✅ Memory Safety - AddressSanitizer, UBSan support
• ✅ Comprehensive Tests - Unit + integration + real-world data tests

📦 Project Structure

appstream/
├── src/                          # C++ source (7 files)
│   ├── AppStreamParser.cpp       # XML parsing logic
│   ├── Component.cpp             # Component model
│   ├── XmlScanner.cpp            # XML tokenizer
│   ├── SqliteWriter.cpp          # Database writing
│   ├── StringPool.cpp            # String interning
│   └── appstream_ffi.cpp         # Dart FFI bridge
├── lib/                          # Dart bindings
│   ├── appstream.dart            # Main Dart API
│   └── src/bindings.dart         # FFI bindings
├── test/                         # Dart tests (4 files)
│   └── appstream_integration_test.dart
├── tests/                        # C++ tests (5 + 2 new)
│   ├── test_*.cpp                # Unit tests
│   ├── benchmark_parser.cpp      # Benchmarks
│   └── test_real_appstream_data.cpp
├── .github/workflows/            # CI/CD pipelines
│   └── build-and-test.yml        # GitHub Actions
├── CMakeLists.txt                # Build configuration
├── pubspec.yaml                  # Dart dependencies
└── docs/                         # Documentation
    ├── ADVANCED_BUILD.md         # Build guide
    ├── RUNNING_TESTS.md          # Test execution
    └── CODE_AUDIT_REPORT.md      # Security/quality audit

🛠️ Quick Start

Prerequisites

• C++23 compatible compiler (GCC 13+, Clang 17+)
• CMake 3.22+
• Dart SDK 3.3+
• SQLite3 development libraries
• GoogleTest (auto-fetched by CMake)

Build & Test

# Default build
cmake -S . -B build && cmake --build build
cd build && ctest

# With code coverage
cmake -S . -B build -DENABLE_COVERAGE=ON
cmake --build build && cd build && ctest

# With sanitizers (AddressSanitizer)
cmake -S . -B build -DENABLE_SANITIZER=asan
cmake --build build && cd build && ctest

# Performance benchmarks
cmake -S . -B build -DENABLE_BENCHMARKS=ON -DCMAKE_BUILD_TYPE=Release
cmake --build build && ./build/tests/appstream_benchmarks

Dart API Usage

import 'package:appstream/appstream.dart';

void main() async {
  // Initialize native library
  Appstream.initialize();

  // Parse XML to SQLite
  final stream = Appstream.parseToSqlite(
    xmlPath: '/path/to/appstream.xml',
    dbPath: '/path/to/catalog.db',
  );

  // Stream results
  await for (final event in stream) {
    print('${event.id}: ${event.name}');
  }
}

📊 Performance Benchmarks

Operation	Time	Components
StringPool (10k strings)	15 ms	100 unique
XmlScanner	45 ms	1000
Parser (streaming)	59 ms	1000
SqliteWriter	125 ms	1000
End-to-end	190 ms	1000
Stress test	946 ms	5000

🧪 Test Coverage

C++ Tests (140)

• ✅ StringPool deduplication
• ✅ XmlScanner tokenization
• ✅ Component parsing
• ✅ SqliteWriter transactions
• ✅ AppStreamParser integration

Dart Tests (45)

• ✅ FFI bindings
• ✅ Integration tests
• ✅ Fallback handling
• ✅ Uninitialized library tests

Real-World Tests (9 new)

• ✅ Flathub app samples (5 real apps)
• ✅ Multi-language support
• ✅ Error handling
• ✅ Large datasets (100+ components)

🔒 Security & Quality

• Security Audit: ✅ 0 CVEs
• Dart Analysis: ✅ No issues
• C++ Analysis: ✅ No critical issues (~100 style suggestions)
• Formatting: ✅ Applied clang-format-19

📖 Documentation

Document	Purpose
ADVANCED_BUILD.md	Comprehensive build & configuration guide
RUNNING_TESTS.md	Test execution and debugging
CODE_AUDIT_REPORT.md	Security & code quality audit
IMPLEMENTATION_INDEX.md	Technical overview of all features
NEXT_STEPS_COMPLETE.md	Recent implementation summary

🚀 CI/CD Pipeline

Automated testing on every push with:

• 8 build configurations (Debug/Release × Sanitizers)
• Code quality checks (lint, format, analyze)
• Performance benchmarking
• Memory safety validation (ASAN/UBSan)
• Coverage tracking (Codecov integration)

📝 Recent Updates (March 26, 2026)

✅ CI/CD Integration - GitHub Actions workflow
✅ Code Coverage - gcov/lcov + Codecov
✅ Performance Benchmarks - 8 comprehensive scenarios
✅ Real Appstream Data - Tests with Flathub apps
✅ Sanitizers - ASAN, MSAN, UBSan support

🔗 Key Technologies

• C++23 - Modern C++ standard library
• SQLite3 - Efficient database storage
• Dart FFI - Foreign Function Interface for Dart
• GoogleTest - C++ unit testing framework
• CMake - Cross-platform build system
• GitHub Actions - CI/CD automation

📋 Project Statistics

• Files: 45+ source files
• Lines of Code: ~8,000 (C++) + ~2,000 (Dart)
• Tests: 185 total (140 C++ + 45 Dart)
• Documentation: 1,200+ lines
• Build Configs: 8+ matrix combinations

🎯 Getting Help

1. Build Issues: See ADVANCED_BUILD.md
2. Test Failures: See RUNNING_TESTS.md
3. Configuration: See CODE_AUDIT_REPORT.md
4. Implementation Details: See IMPLEMENTATION_INDEX.md

📄 License

Apache License 2.0 - See LICENSE file

👤 Contributors

• Joel Winarske (Creator & Maintainer)

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Status: ✅ Production Ready
Last Updated: March 26, 2026
Version: 0.2.0