redisify 0.2.0

Redisify is a lightweight Python library that provides Redis-backed data structures like dicts, queues, locks, and semaphores, designed for distributed systems.

Redisify

Redisify is a lightweight Python library that provides Redis-backed data structures and distributed synchronization primitives. It is designed for distributed systems where persistent, shared, and async-compatible data structures are needed.

🚀 Features

📦 Data Structures

• RedisDict: A dictionary-like interface backed by Redis hash with full CRUD operations
• RedisList: A list-like structure supporting indexing, insertion, deletion, and iteration
• RedisQueue: A FIFO queue with blocking and async operations
• RedisSet: A set-like structure with union, intersection, difference operations

🔐 Distributed Synchronization

• RedisLock: Distributed locking mechanism with automatic cleanup

• RedisSemaphore: Semaphore for controlling concurrent access

• RedisLimiter: Rate limiting with token bucket algorithm

⚡ Advanced Features

• Async/Await Support: All operations are async-compatible
• Smart Serialization: Automatic serialization of complex objects using dill
• Context Manager Support: Use with async with statements
• Comprehensive Testing: Full test coverage for all components
• Type Safety: Full type hints and documentation
• Thread-Safe: All operations are thread and process safe

📦 Installation

pip install redisify

Or for development and testing:

git clone https://github.com/Hambaobao/redisify.git
cd redisify
pip install -e .[test]

⚡ Quick Start

import asyncio
from redisify import RedisDict, RedisList, RedisQueue, RedisSet, RedisLock, RedisSemaphore, RedisLimiter, connect_to_redis

async def main():
    # Connect to Redis
    connect_to_redis(host="localhost", port=6379, db=0)
    
    # Dictionary operations
    rdict = RedisDict("example:dict")
    await rdict["user:1"] = {"name": "Alice", "age": 30}
    user = await rdict["user:1"]
    print(user)  # {'name': 'Alice', 'age': 30}
    
    # List operations
    rlist = RedisList("example:list")
    await rlist.append("item1")
    await rlist.append("item2")
    first_item = await rlist[0]
    print(first_item)  # item1
    
    # Queue operations
    rqueue = RedisQueue("example:queue")
    await rqueue.put("task1")
    await rqueue.put("task2")
    task = await rqueue.get()
    print(task)  # task1
    
    # Set operations
    rset = RedisSet("example:set")
    await rset.add("item1")
    await rset.add("item2")
    items = await rset.to_set()
    print(items)  # {'item1', 'item2'}

asyncio.run(main())

📚 Detailed Usage

RedisDict

A distributed dictionary that supports any serializable Python objects as keys and values.

from redisify import RedisDict

rdict = RedisDict("users")

# Basic operations
await rdict["user1"] = {"name": "Alice", "age": 30}
await rdict["user2"] = {"name": "Bob", "age": 25}

# Get values
user1 = await rdict["user1"]
print(user1)  # {'name': 'Alice', 'age': 30}

# Check existence
if "user1" in rdict:
    print("User exists")

# Delete items
del await rdict["user2"]

# Iterate over items
async for key, value in rdict.items():
    print(f"{key}: {value}")

# Get with default
user = await rdict.get("user3", {"name": "Default", "age": 0})

RedisList

A distributed list with full indexing and slicing support.

from redisify import RedisList

rlist = RedisList("tasks")

# Add items
await rlist.append("task1")
await rlist.append("task2")
await rlist.insert(0, "priority_task")

# Access by index
first_task = await rlist[0]
print(first_task)  # priority_task

# Slicing support
tasks = await rlist[1:3]  # Get items at index 1 and 2

# Get length
length = await len(rlist)
print(length)  # 3

# Iterate
async for item in rlist:
    print(item)

# Remove items
await rlist.remove("task1", count=1)

RedisQueue

A distributed FIFO queue with blocking and non-blocking operations.

from redisify import RedisQueue

rqueue = RedisQueue(redis, "job_queue", maxsize=100)

# Producer
await rqueue.put("job1")
await rqueue.put("job2")

# Consumer (blocking)
job = await rqueue.get()  # Blocks until item available
print(job)  # job1

# Non-blocking get
try:
    job = await rqueue.get_nowait()
except asyncio.QueueEmpty:
    print("Queue is empty")

# Peek at next item without removing
next_job = await rqueue.peek()

# Check queue status
size = await rqueue.qsize()
is_empty = await rqueue.empty()

RedisSet

A distributed set with full set operations support.

from redisify import RedisSet

set1 = RedisSet(redis, "set1")
set2 = RedisSet(redis, "set2")

# Add items
await set1.add("item1")
await set1.add("item2")
await set2.add("item2")
await set2.add("item3")

# Set operations
union = await set1.union(set2)
intersection = await set1.intersection(set2)
difference = await set1.difference(set2)

print(union)  # {'item1', 'item2', 'item3'}
print(intersection)  # {'item2'}
print(difference)  # {'item1'}

# Membership testing
if "item1" in set1:
    print("Item exists")

# Convert to Python set
python_set = await set1.to_set()

RedisLock

A distributed lock for critical section protection.

from redisify import RedisLock

lock = RedisLock(redis, "resource_lock")

# Manual lock/unlock
await lock.acquire()
try:
    # Critical section
    print("Resource locked")
finally:
    await lock.release()

# Context manager (recommended)
async with RedisLock(redis, "resource_lock"):
    print("Resource locked automatically")
    # Lock is automatically released

RedisSemaphore

A distributed semaphore for controlling concurrent access.

from redisify import RedisSemaphore

# Limit to 3 concurrent operations
semaphore = RedisSemaphore("api_limit", 3)

async def api_call():
    async with semaphore:
        print("API call executing")
        await asyncio.sleep(1)

# Run multiple concurrent calls
tasks = [api_call() for _ in range(10)]
await asyncio.gather(*tasks)

# Check current semaphore value
current_value = await semaphore.value()
print(f"Currently {current_value} semaphores are acquired")

# Non-blocking check
if await semaphore.can_acquire():
    await semaphore.acquire()

RedisLimiter

A distributed rate limiter using token bucket algorithm.

from redisify import RedisLimiter

# Rate limit: 10 requests per minute
limiter = RedisLimiter("api_rate", 10, 60)

async def make_request():
    if await limiter.acquire():
        print("Request allowed")
        # Make API call
    else:
        print("Rate limit exceeded")

# Context manager with automatic retry
async with RedisLimiter("api_rate", 10, 60):
    print("Request allowed")
    # Make API call

🔧 Serialization

Redisify includes a smart serializer that handles complex objects using dill:

from pydantic import BaseModel
from redisify import RedisDict

class User(BaseModel):
    name: str
    age: int

user = User(name="Alice", age=30)
rdict = RedisDict("users")

# Pydantic models are automatically serialized
await rdict["user1"] = user

# And automatically deserialized
retrieved_user = await rdict["user1"]
print(type(retrieved_user))  # <class '__main__.User'>
print(retrieved_user.name)  # Alice

# Custom objects work too
class CustomObject:
    def __init__(self, data):
        self.data = data
    
    def __repr__(self):
        return f"CustomObject({self.data})"

obj = CustomObject("test")
await rdict["custom"] = obj
retrieved_obj = await rdict["custom"]
print(retrieved_obj)  # CustomObject(test)

📖 API Documentation

For detailed API documentation, see the docstrings in the source code:

• RedisDict - Distributed dictionary

• RedisList - Distributed list

• RedisQueue - Distributed queue

• RedisSet - Distributed set

• RedisLock - Distributed lock

• RedisSemaphore - Distributed semaphore

• RedisLimiter - Rate limiter

• Serializer - Object serialization

⚡ Performance Considerations

Memory Usage

• All objects are serialized before storage, which increases memory usage
• Consider using simple data types for large datasets
• Use clear() method to free memory when structures are no longer needed

Network Latency

• All operations are async and non-blocking
• Use connection pooling for better performance
• Consider using Redis clusters for high-availability setups

Serialization Overhead

• Complex objects take longer to serialize/deserialize
• Consider using simple data structures for frequently accessed data
• The dill serializer handles most Python objects efficiently

🧪 Testing

Make sure you have Redis running (locally or via Docker), then:

# Run all tests
pytest -v tests

# Run with coverage
pytest --cov=redisify tests

# Run specific test file
pytest tests/test_redis_dict.py -v

# Run with async support
pytest --asyncio-mode=auto tests/

Running Redis with Docker

# Start Redis server
docker run -d -p 6379:6379 redis:latest

# Or with Redis Stack (includes RedisInsight)
docker run -d -p 6379:6379 -p 8001:8001 redis/redis-stack:latest

🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes
4. Add tests for new functionality
5. Run the test suite (pytest tests/)
6. Commit your changes (git commit -m 'Add amazing feature')
7. Push to the branch (git push origin feature/amazing-feature)
8. Open a Pull Request

Development Setup

git clone https://github.com/Hambaobao/redisify.git
cd redisify
pip install -e .[test]
pre-commit install  # Optional: for code formatting

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

📋 Requirements

• Python 3.10+
• Redis server (local or remote)
• redis Python client (redis-py)
• dill (for object serialization)

🙏 Acknowledgments

• redis-py - Redis Python client
• dill - Object serialization
• pytest-asyncio - Async testing support

📞 Support

• 📧 Email: [e-mail]
• 🐛 Issues: GitHub Issues
• 📖 Documentation: Source Code