FailoverCache

FailoverCache is a flexible and persistent Python caching library that automatically falls back to disk storage when Redis is unavailable. Ideal for development and production environments where Redis may not always be present.

🚀 Features

• 🔁 Automatic fallback from Redis to diskcache
• ⏳ Time-To-Live (TTL) support for all values
• 🧠 remember() helper to avoid duplicate calculations
• 🧹 Flush the entire cache
• 🔄 Extend or set TTL after creation
• ✅ No Redis required during development

📦 Installation

pip install FailoverCache

🧪 Example Usage

from FailoverCache import FailoverCache

cache = FailoverCache()

# Store a value for 60 seconds
cache.put("greeting", "hello world", ttl=60)

# Retrieve it later
print(cache.get("greeting"))  # hello world

# Only compute if not cached
data = cache.remember("expensive", lambda: "result_of_heavy_work", ttl=300)

# Extend TTL by 120 seconds
cache.extend_ttl("greeting", 120)

# Set TTL to exactly 300 seconds
cache.set_ttl("greeting", 300)

# Flush all cache entries
cache.flush()

📂 How it works

1. Tries to connect to Redis (localhost:6379 by default).
2. If Redis is not available or fails, it falls back to local disk storage using diskcache.
3. All operations transparently use the first working backend.

🔧 Configuration

You can customize Redis host/port and disk cache path:

cache = FailoverCache(redis_host="redis", redis_port=6379, diskcache_directory=".my_cache")

📄 License

FailoverCache is licensed under the MIT License.