https://github.com/Python3WebSpider/ScrapyRedisBloomFilter
Scrapy Redis Bloom Filter
https://github.com/Python3WebSpider/ScrapyRedisBloomFilter
Last synced: 3 months ago
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Scrapy Redis Bloom Filter
- Host: GitHub
- URL: https://github.com/Python3WebSpider/ScrapyRedisBloomFilter
- Owner: Python3WebSpider
- Created: 2017-08-11T08:43:16.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2021-07-25T18:17:09.000Z (almost 4 years ago)
- Last Synced: 2024-09-17T01:53:13.969Z (9 months ago)
- Language: Python
- Size: 34.2 KB
- Stars: 173
- Watchers: 3
- Forks: 52
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
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README
# Scrapy-Redis-BloomFilter
This is a package for supporting BloomFilter of Scrapy-Redis.
## Installation
You can easily install this package with pip:
```
pip install scrapy-redis-bloomfilter
```
Dependency:
- Scrapy-Redis >= 0.6.8
## Usage
Add this settings to `settings.py`:
```python
# Use this Scheduler, if your scrapy_redis version is <= 0.7.1
SCHEDULER = "scrapy_redis_bloomfilter.scheduler.Scheduler"
# Ensure all spiders share same duplicates filter through redis
DUPEFILTER_CLASS = "scrapy_redis_bloomfilter.dupefilter.RFPDupeFilter"
# Redis URL
REDIS_URL = 'redis://localhost:6379'
# Number of Hash Functions to use, defaults to 6
BLOOMFILTER_HASH_NUMBER = 6
# Redis Memory Bit of Bloom Filter Usage, 30 means 2^30 = 128MB, defaults to 30
BLOOMFILTER_BIT = 10
# Persist
SCHEDULER_PERSIST = True
```
## Test
Here is a test of this project, usage:
```
git clone https://github.com/Python3WebSpider/ScrapyRedisBloomFilter.git
cd ScrapyRedisBloomFilter/test
scrapy crawl test
```
Note: please change REDIS_URL in settings.py.
Spider like this:
```python
from scrapy import Request, Spider
class TestSpider(Spider):
name = 'test'
base_url = 'https://www.baidu.com/s?wd='
def start_requests(self):
for i in range(10):
url = self.base_url + str(i)
yield Request(url, callback=self.parse)
# Here contains 10 duplicated Requests
for i in range(100):
url = self.base_url + str(i)
yield Request(url, callback=self.parse)
def parse(self, response):
self.logger.debug('Response of ' + response.url)
```
Result like this:
```python
{'bloomfilter/filtered': 10, # This is the number of Request filtered by BloomFilter
'downloader/request_bytes': 34021,
'downloader/request_count': 100,
'downloader/request_method_count/GET': 100,
'downloader/response_bytes': 72943,
'downloader/response_count': 100,
'downloader/response_status_count/200': 100,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2017, 8, 11, 9, 34, 30, 419597),
'log_count/DEBUG': 202,
'log_count/INFO': 7,
'memusage/max': 54153216,
'memusage/startup': 54153216,
'response_received_count': 100,
'scheduler/dequeued/redis': 100,
'scheduler/enqueued/redis': 100,
'start_time': datetime.datetime(2017, 8, 11, 9, 34, 26, 495018)}
```