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An easy-to-use cache for humans

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# mecache

An easy-to-use cache module

## How to use

Run `pip install mecache` or `pipenv install mecache` to install.

Built-in two cache modes, file cache mode, redis cache mode.

You can control the time of cache failure by using the cache parameters.

### redis modes

```python
from mecache import Redis

# Refer to https://redis-py.readthedocs.io/en/latest/ for all parameters
redis = Redis(host="127.0.0.1", port='6379', db=0, password="password")

# Cache failure after 60 seconds
@redis.cache(60)
def do(x, y):
    import time
    time.sleep(2)
    return x+y
```

### asynchronous redis modes

```python
from mecache import AioRedis

# Refer to https://aioredis.readthedocs.io/en/latest/api_reference.html#aioredis.create_redis_pool for all parameters
file = await AioRedis('redis://localhost')

# Cache failure after 60 seconds
@file.cache(60)
async def do(x, y):
    return await do.something
```

### file modes

```python
from mecache import File

# CACHE_PATH like '/var/tmp/test-cache'
file = File("CACHE_PATH")

# Cache failure after 60 seconds
@file.cache(60)
def do(x, y):
    import time
    time.sleep(2)
    return x+y
```

### asynchronous file modes

```python
from mecache import AioFile

# CACHE_PATH like '/var/tmp/test-cache'
file = AioFile("CACHE_PATH")

# Cache failure after 60 seconds
@file.cache(60)
async def do(x, y):
    return await do.something
```

## Advanced usage

If the parameters of a function are difficult to serialize using pickle, you can specify the rules that generate key by customizing `keyf`. The return value of the function `keyf`  must be a string.

```python
# a example in django view function

def key_by_user(request):
    return request.user.username

@file.cache(60*60, keyf=key_by_user)
def home(request):
    return render(request, 'home.html')
```

You can also overwrite `keyf` for all cache. This is a example:

```python
from mecache import File

class CustomFile(File):
    @staticmethod
    def keyf(*args, **kwargs):
        string = do.something
        return string

file = CustomFile("CACHE_PATH")
```

### Custom made

If you need a custom cache, you can use `BaseCache` or `AioBaseCache` to create your cache class. Like this

```python
from mecache import BaseCache

class CustomCache(BaseCache):

def get_cache(self, func, key, max_time):
        qual = func.__qualname__
        return get(qual+":"+key)

def set_cache(self, result, func, key, max_time):
        qual = func.__qualname__
        set(qual+":"+key, result, ex=time.time()+max_time)
```

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