pancake-framework 0.2.3

Pancake - Decorator-driven Python web framework with IoC, MyBatis ORM, and AI workflow

Pancake Framework

A decorator-driven Python framework with Spring-inspired IoC, MyBatis-style ORM, and AI workflow integration.

中文文档

Features

• Dough IoC System — Spring-inspired Bean container with full lifecycle (on_init → on_start → on_stop → on_destroy)
• Decorator-Driven — @Singleton, @Prototype, @Lazy, @DependsOn, @Import, @inject
• Async First — All lifecycle methods support async def, DoughFactory handles sync/async transparently
• Zero Import — All decorators and services auto-injected into builtins
• Base Classes — Configuration (bean factory), Service, Struct (dataclass + Dough), Function
• MyBatis Plus ORM — Async ORM with CRUD, @Select/@Insert, dynamic SQL, chain queries
• AI Module — Unified LLM client (OpenAI/DeepSeek/Gemini/Ollama), memory, RAG
• Redis Cache — @cached with anti-penetration/avalanche/breakdown protection
• Message Queue — Event-driven with SimpleBroker and RedisBroker
• Plugin System — XML-based plugin management, auto pip install, pancake plugin CLI

Quick Start

pip install pancake_framework
pancake create myapp && cd myapp
pancake run

Server starts at http://127.0.0.1:8080. Health check at /health.

Dough IoC System

The core of Pancake is the Dough system — a Spring-inspired IoC container.

Bean Lifecycle

__init__()  →  on_init()  →  on_start()  →  [running]  →  on_stop()  →  on_destroy()
   构造        @PostConstruct    就绪                        停止         @PreDestroy

Scopes

Scope	Decorator	Description
Singleton	@Singleton	One instance per factory (default)
Prototype	@Prototype	New instance every resolve
Lazy	@Lazy	Created on first access

Example

from pancake import Service, DoughFactory, DependsOn, inject, Singleton

@Singleton
@DependsOn("DatabaseService")
class UserService(Service):
    async def on_init(self):
        self.db = DoughFactory.get().resolve("DatabaseService")

    async def find_user(self, user_id: int):
        return await self.db.query(user_id)

class AppConfig(Configuration):
    def my_cache(self):
        return RedisCache()

    @noMaker
    def helper(self):
        return "not a bean"

Decorators

Decorator	Target	Description
@DoughDecorator	Class	Mark class as Bean
@Singleton	Class	Singleton scope
@Prototype	Class	Prototype scope
@Lazy	Class	Lazy initialization
@DependsOn("A", "B")	Class	Declare dependencies
@Import(ExternalCls)	Class	Auto-register external classes
@Maker	Method	Mark method return as Bean
@noMaker	Method	Exclude method from auto-registration
@inject	Function	Auto-inject dependencies from factory
@Config	Class	Inject fields from settings

Documentation

Module	Description
CLI	Command-line tools
MyBatis ORM	Mappers, CRUD, chain queries, dynamic SQL
AI	LLM client, memory, RAG
Redis	Cache, data structures, distributed locks
Config	YAML/XML/env configuration
Plugins	Plugin system and built-in plugins
Messaging	Event-driven message queue
Remote	HTTP and gRPC remote calls

Optional Dependencies

pip install pancake_framework[ai]          # AI module
pip install pancake_framework[langgraph]   # LangGraph workflow
pip install pancake_framework[redis]       # Redis cache & messaging
pip install pancake_framework[grpc]        # gRPC remote calls
pip install pancake_framework[cui]         # Click CLI commands
pip install pancake_framework[gui]         # Flet GUI
pip install pancake_framework[all]         # All optional deps

Architecture

pancake/
├── dough.py           # Dough base class, Scope enum, DoughMeta metaclass
├── registry.py        # Global class & decorator registry
├── decorators.py      # @Singleton, @Prototype, @Lazy, @inject, etc.
├── settings.py        # Centralized configuration management
├── run.py             # Startup pipeline
├── base/              # Configuration, Function, Service, Struct
├── factory/           # DoughFactory — Bean lifecycle management
├── builder/           # Build pipeline, plugin loader, source loader
├── cli/               # CLI commands (create/run/plugin/config)
├── ovenware/          # Broker (message queue)
├── resource/          # YAML/JSON/XML config loaders
└── tool/              # Utilities

TODO

Core / IoC

• Database migration support
• Configuration hot-reload
• Pagination Page object abstraction
• OpenTelemetry / metrics integration
• Graceful shutdown with signal handling
• WebSocket support
• Rate limiting middleware
• API documentation auto-generation
• More database dialects (SQLite/PG/MySQL type mapping)
• Connection pool health check and auto-reconnect
• JWT authentication support
• Scheduled tasks (cron-like)
• CLI interactive code (REPL)
• Bean lifecycle callbacks — on_init(@PostConstruct), on_destroy(@PreDestroy)
• Lazy initialization — @Lazy for deferred bean creation
• Dependency resolution — @DependsOn topological sort, @Import auto-register
• Async lifecycle — all lifecycle methods support async def
• Zero import — all decorators/services auto-injected into builtins
• Circular dependency detection — topological sort with cycle reporting
• Integration tests — 42 tests covering multi-layer deps, diamond, edge cases
• Auto-configuration — auto-detect dependencies and configure defaults
• Profiles — environment-specific config (dev / test / prod)
• Conditional beans — @ConditionalOnProperty, @ConditionalOnClass
• Event system — @EventListener, application events (ContextRefreshed, etc.)
• Property binding — auto-map YAML/ENV to dataclass (@ConfigurationProperties)

Web / REST

• CORS configuration — global and per-route CORS policy
• API versioning — /api/v1/users, /api/v2/users
• Exception handler — @ExceptionHandler, global error response
• Request logging middleware — auto-log method, path, status, duration
• Response compression — gzip/brotli middleware
• File upload — @multipart, multipart/form-data handling
• Server-Sent Events — @sse_controller for real-time push
• Request body validation — Pydantic-style @Valid on request models
• Content negotiation — JSON / XML response based on Accept header
• Async route handler — auto-detect async vs sync functions
• Static file serving — built-in static directory mount
• Request ID — auto-generate and propagate X-Request-Id

Security

• OAuth2 support — OAuth2 client and resource server
• API key authentication — @api_key_required header-based auth
• Password hashing — bcrypt/argon2 integration
• CSRF protection — token-based CSRF for form submissions
• Security headers — auto-add HSTS, X-Frame-Options, CSP
• IP whitelist/blacklist — middleware-based IP filtering
• Session management — server-side session with Redis/memory store

Data / ORM

• Transaction propagation — REQUIRED, REQUIRES_NEW, NESTED
• Soft delete — @SoftDelete, deleted_at column support
• Auto timestamps — created_at, updated_at auto-fill
• Optimistic locking — version field for concurrent update safety
• Multi-datasource — connect to multiple databases simultaneously
• Database seeding — auto-insert initial data on startup
• Query logging — SQL statement logging with execution time
• Raw SQL helper — db.execute_raw(sql) with safety checks
• Relation mapping — one-to-many, many-to-many lazy/eager loading

AOP / Middleware

• AOP (Aspect-Oriented Programming) — @Before, @After, @Around pointcuts
• Retry mechanism — @Retry(max=3, delay=1) for flaky operations
• Circuit breaker — @CircuitBreaker for fault tolerance
• Cache abstraction — @Cacheable, @CacheEvict (multi-backend: memory/Redis)
• Async execution — @Async for non-blocking background tasks
• Method timer — @Timed for method execution metrics
• Locking — @DistributedLock for concurrent access control

Observability

• Structured logging — JSON log output with correlation ID
• Health indicators — custom health checks (DB, Redis, external API)
• Distributed tracing — OpenTelemetry trace context propagation
• Log levels API — runtime log level change via REST endpoint

Plugin System

• XML-based plugin declaration — <dependencies> in pancake.xml
• Auto pip install — import-first, pip-fallback on ImportError
• CLI management — pancake plugin list/add/remove/clear
• CLI modularization — split monolithic cli.py into cli/ package
• Plugin marketplace — central registry for discovering plugins
• Plugin version constraints — <version> tag with semver matching
• Plugin hooks — on_install, on_uninstall, on_upgrade lifecycle

DevOps / CLI

• CLI modularization — split into cli/ package (project/config/plugin/misc)
• Project scaffolding — pancake create with templates (API / Fullstack / Microservice)
• Code generation — auto-generate Mapper/Controller from table schema
• DevTools — auto-restart on code change (watchdog)
• Docker support — auto-generate Dockerfile and docker-compose.yml
• Config validation — startup validation of required config keys
• Dry run — pancake check with full dependency and config validation

Performance

• C extension — convert hot-path modules (sql_parser, wrapper, jwt) to C for speed

Tests

pip install pytest pytest-asyncio
python -m pytest tests/ -v

License

MIT