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https://github.com/nerohin/millions-crawler
Homework III of NCKU course WEB RESOURCE DISCOVERY AND EXPLOITATION , I've used the distribute crawler to crawling over miliion web page.
https://github.com/nerohin/millions-crawler
crawler distributed scrapy spider web-crawler
Last synced: about 2 months ago
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Homework III of NCKU course WEB RESOURCE DISCOVERY AND EXPLOITATION , I've used the distribute crawler to crawling over miliion web page.
- Host: GitHub
- URL: https://github.com/nerohin/millions-crawler
- Owner: NeroHin
- License: mit
- Created: 2023-03-08T06:20:09.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2023-10-28T07:41:59.000Z (about 1 year ago)
- Last Synced: 2023-10-28T08:26:47.989Z (about 1 year ago)
- Topics: crawler, distributed, scrapy, spider, web-crawler
- Language: Python
- Homepage:
- Size: 681 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# millions-crawler
This the NCKU course WEB RESOURCE DISCOVERY AND EXPLOITATION homework III, targe is create a crawler application to crawling millions webpage.
[image source](https://www.simplilearn.com/what-is-a-web-crawler-article)
## Part of the homework:
[Medium Article](https://medium.com/@NeroHin/%E7%88%AC%E8%9F%B2%E6%9C%89%E5%B0%88%E6%94%BB-%E5%88%9D%E6%8E%A2-scrapy-%E7%88%AC%E8%9F%B2-%E4%BB%A5%E7%88%AC%E5%8F%96-15-%E8%90%AC%E7%AD%86%E7%B7%9A%E4%B8%8A%E9%86%AB%E7%99%82%E5%92%A8%E8%A9%A2-qa-%E7%82%BA%E4%BE%8B%E5%AD%90-39a6383a2de4)
# Homework Scope
1. **Crawl millions of webpages**
2. **Remove non-HTML pages**
3. **Performance optimization**
- How many page can crawl per hour
- Total time to crawl millions of pages
# Project architecture
### Distributed architecture
### Each spider
### Spider with [台灣 E 院](https://sp1.hso.mohw.gov.tw/doctor/Index1.php)
### Spider with [問 8 健康諮詢](https://tw.wen8health.com/)
### Spider with [Wiki](https://en.wikipedia.org/wiki/Main_Page)
### Anti-Anti-Spider
1. Skip robot.txt
```bash
# edit settings.py
ROBOTSTXT_OBEY = False
```
2. Use random user-agent
```bash
pip install fake-useragent
```
```python
# edit middlewares.py
class FakeUserAgentMiddleware(UserAgentMiddleware):
def __init__(self, user_agent=''):
self.user_agent = user_agent
def process_request(self, request, spider):
ua = UserAgent()
request.headers['User-Agent'] = ua.random
```
```python
DOWNLOADER_MIDDLEWARES = {
"millions_crawler.middlewares.FakeUserAgentMiddleware": 543,
}
```
# Result
## single spider in 2023/03/21
| Spider | Total Page | Total Time (hrs) | Page per Hour |
| :----: | :--------: | :--------------: | :-----------: |
| tweh | 152,958 | 1.3 | 117,409 |
| w8h | 4,759 | 0.1 | 32,203 |
| wiki* | 13,000,320 | 43 | 30,240 |
## distributed spider (4 spider) in 2023/03/24
| Spider | Total Page | Total Time (hrs) | Page per Hour |
| :----: | :--------: | :--------------: | :-----------: |
| tweh | 153,288 | 0.52 | - |
| w8h | 4,921 | 0.16 | - |
| wiki* | 4,731,249 | 43.2 | 109,492 |
# How to use
0. create a .env file
```bash
bash create_env.sh
```
1. Install [Redis](https://redis.io/)
```bash
sudo apt-get install redis-server
```
2. Install [MongoDB](https://www.mongodb.com/)
```bash
sudo apt-get install mongodb
```
3. Run Redis
```bash
redis-server
```
4. run MongoDB
```bash
sudo service mongod start
```
5. Run spider
```bash
cd millions-crawler
scrapy crawl [$spider_name] # $spider_name = tweh, w8h, wiki
```
# Requirement
```bash
pip install -r requirements.txt
```
# Reference
1. [GitHub | fake-useragent](https://github.com/fake-useragent/fake-useragent)
2. [GitHub | scrapy](https://github.com/scrapy/scrapy)
3. [【Day 20】反反爬蟲](https://ithelp.ithome.com.tw/articles/10224979)
4. [Documentation of Scrapy](https://docs.scrapy.org/en/latest/index.html)
5. [解决 Redis 之 MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist o...](https://www.jianshu.com/p/3aaf21dd34d6)
6. [Ubuntu Linux 安裝、設定 Redis 資料庫教學與範例](https://officeguide.cc/ubuntu-linux-redis-database-installation-configuration-tutorial-examples/)
7. [如何連線到遠端的 Linux + MongoDB 伺服器？](https://magiclen.org/mongodb-remote)
8. [Scrapy-redis 之終結篇](https://www.twblogs.net/a/5ef9b649952deac88f79c670)