crawler-rocket 0.1.0
Help you to build web crawlers easily and quickly
License: MIT

# Crawler Rocket :rocket:

## Why build this ？:grey_question:
As an information analyst in the library of my university, I usually need to write a lot of crawler scripts with all kinds of functions, but I found that I spent a lot of time writing non-business logic code such as environment configuration or document processing(excel, csv...), so I developed this tool to help myself quickly build the basic framework of crawlers and handle some redundant work, so that I can focus on writing real business logic.

## How to Use this? :muscle:
Here's a code example from my previous job
```python
import traceback
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.common import exceptions
import time
import xlsxwriter
import os

class ShangHaiRanking:
    __SHANGHAIRANKING_ROOT = './科软排名'
    indicator_list = []
    more_indicator_cnt = 0

    def __init__(self):
        self._driver = webdriver.Chrome()

    def __initIndicatorList(self):
        self.indicator_list.clear()
        butt = self._driver.find_element_by_xpath('//*[@id="content-box"]/div[2]/table/thead/tr/th[6]/div/div[1]/div[1]/input')
        self._driver.execute_script('arguments[0].click();', butt)
        menu = self._driver.find_element_by_xpath('//*[@id="content-box"]/div[2]/table/thead/tr/th[6]/div/div[1]/div[2]/ul')\
                            .find_elements_by_css_selector('li')
        for m in menu:
            self.indicator_list.append(m.text)
        self.more_indicator_cnt = len(menu)

    #init workbook
    def __initWorkBook(self, year):
        if not os.path.exists(self.__SHANGHAIRANKING_ROOT):
            os.mkdir(self.__SHANGHAIRANKING_ROOT)
            if os.path.exists(self.__SHANGHAIRANKING_ROOT):
                print('[info]: 文件创建成功')
            else:
                print('[error]: 文件创建失败')
                exit(1)
        self.workBook = xlsxwriter.Workbook(f'{self.__SHANGHAIRANKING_ROOT}/bcur_{year}.xlsx')
        print('[info]: workbook initialized...')


    def __closeWorkBook(self):
        self.workBook.close()
        print('[info]: workbook closed...')


    #init sheet
    def __initSheet(self):
        if self.workBook == 0 or not isinstance(self.workBook, xlsxwriter.Workbook):
            print("[error]: init workbook first")
            self.close()
            exit(1)
        self.sheet = self.workBook.add_worksheet()
        #initial the table head
        self.sheet.write(0, 0, '排名')
        self.sheet.write(0, 1, '学校名称')
        self.sheet.write(0, 2, '英文名称')
        self.sheet.write(0, 3, '标签')
        self.sheet.write(0, 4, '省市')
        self.sheet.write(0, 5, '类型')
        self.sheet.write(0, 6, '总分')
        for i in range(len(self.indicator_list)):
            self.sheet.write(0, 7 + i, self.indicator_list[i])
        print('[info]: sheet initialized...')


    def recording(self, year):
        offset = 1
        url = f'https://www.shanghairanking.cn/rankings/bcur/{year}'
        self._driver.get(url)
        time.sleep(2)
        self.__initIndicatorList()
        self.__initWorkBook(year)
        self.__initSheet()
        while True:
            table = self._driver.find_element_by_xpath('//*[@id="content-box"]/div[2]/table/tbody')
            trs = table.find_elements_by_tag_name('tr')
            curline = offset
            for tr in trs:
                tds = tr.find_elements_by_tag_name('td')
                self.sheet.write(curline, 0, tds[0].text)
                self.sheet.write(curline, 1, tds[1].find_element_by_class_name('name-cn').text)
                self.sheet.write(curline, 2, tds[1].find_element_by_class_name('name-en').text)
                try:
                    tags = tds[1].find_element_by_class_name('tags')
                    self.sheet.write(curline, 3, tags.text)
                except exceptions.NoSuchElementException:
                    self.sheet.write(curline, 3, '')
                self.sheet.write(curline, 4, tds[2].text)
                self.sheet.write(curline, 5, tds[3].text)
                self.sheet.write(curline, 6, tds[4].text)
                curline = curline + 1
            for index in range(self.more_indicator_cnt):
                curline = offset
                butt = self._driver.find_element_by_xpath('//*[@id="content-box"]/div[2]/table/thead/tr/th[6]/div/div[1]/div[1]/input')
                self._driver.execute_script('arguments[0].click();', butt)
                menu = self._driver.find_element_by_xpath('//*[@id="content-box"]/div[2]/table/thead/tr/th[6]/div/div[1]/div[2]/ul')\
                                    .find_elements_by_css_selector('li')
                self._driver.execute_script('arguments[0].click();', menu[index])
                time.sleep(0.5)
                for tr in trs:
                    self.sheet.write(curline, 7 + index, tr.find_elements_by_tag_name('td')[-1].text)
                    curline = curline + 1
            offset = curline
            try:
                self._driver.find_element_by_class_name('ant-pagination-disabled.ant-pagination-next')
                print('[processing: {} finished...]'.format(offset - 1))
                print(f'[info]: shanghairanking of {year} is finished...')
                self.__closeWorkBook()
                return
            except exceptions.NoSuchElementException:
                nextButt = self._driver.find_element_by_class_name('ant-pagination-next')
                self._driver.execute_script('arguments[0].click();', nextButt)
                print('[processing: {} finished...]'.format(offset - 1))
                time.sleep(0.5)
            except BaseException as e:
                self.__closeWorkBook()
                raise(e)


    def close(self):
        self._driver.close()


if __name__ == '__main__':
    shr = ShangHaiRanking()
    try:
        for i in range(2018, 2021):
            shr.recording(i)
    except BaseException as e:
        print('[error]: crashed, details are blow')
        print(traceback.format_exc(), end='')
    finally:
        shr.close()
```

If using CrawlerRocket, things get much easier!

```python
todo
```

## The scheduler :alarm_clock: :hourglass_flowing_sand: