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bloomfilter

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bloom filter 过滤器

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# bloom filter 过滤器
高效的挡住无效的请求和流量，可用于数据库查询前，过滤非命中查询。也可以用来防止redis缓存击穿。

## WHY
- [bloomfilter过滤器实战](doc/bloomfilter_in_action.md)
- [bloomfilter的原理](doc/bloomfilter_principle.md)

## 安装
```shell
git clone https://github.com/luw2007/bloomfilter.git && \
    cd bloomfilter && \
    pip install -r requirements.txt && \
    python setup.py install
```

### 通过源代码安装项目依赖：
pyreBloom, hiredis(非必须)
```shell
git clone https://github.com/redis/hiredis.git /root/src/hiredis && \
    cd /root/src/hiredis && \
    make && make PREFIX=/usr install &&\
    ldconfig
git clone https://github.com/seomoz/pyreBloom /root/src/pyreBloom && \
    cd /root/src/pyreBloom && \
    python setup.py install
```

## 使用方法:
```python
>>> from bloomfilter.base import BaseModel
>>> class TestModel(BaseModel):
...    PREFIX = "bf:test"
>>> t = TestModel()
>>> t.add('hello')
1
>>> t.extend(['hi', 'world'])
2
>>> t.contains('hi')
True
>>> t.delete()
```
## 可用方法:
extend, keys, contains, add, put, hashes, bits, delete

## 例子
请查看[example](examples)目录

## Q&A
1. 运行报错, 缺少pyreBloom?
```
In [1]: from bloomfilter.base import BaseModel
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-3172e213138d> in <module>
----> 1 from bloomfilter.base import BaseModel

~/github/bloomfilter/bloomfilter/base.py in <module>
     52 import logging
     53 from six import PY3 as IS_PY3
---> 54 from pyreBloom import pyreBloom, pyreBloomException
     55
     56 from bloomfilter.utils import force_utf8

ModuleNotFoundError: No module named 'pyreBloom'
```
安装`pyreBloom`，pip install -r requirements.txt

bloomfilter

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