Module cmc.modules.exchange.dex
Module for fetching dex exchange rankings from CoinMarketCap website.
Expand source code
#!/usr/bin/env python
"""Module for fetching dex exchange rankings from CoinMarketCap
website."""
from datetime import datetime
import os
import time
from typing import Any, Dict, List, Optional, Tuple, Union
import bs4
from bs4 import BeautifulSoup
from selenium import webdriver
from selenium.webdriver.common.by import By
from cmc.modules.base import CMCBaseClass
from cmc.utils.exceptions import ScrapeError
from cmc.utils.models import DexData
class Dex(CMCBaseClass):
"""Class for scraping the data of top dex exchanges."""
def __init__(self, proxy: Optional[str] = None, as_dict: bool = False) -> None:
"""
Args:
proxy (Optional[str], optional): Proxy to be used for Selenium and requests Session. Defaults to None.
as_dict (bool): Return the data as a dictionary. Defaults to False.
"""
super().__init__(proxy)
self.base_url = "https://coinmarketcap.com/rankings/exchanges/dex/"
self.out = as_dict
@property
def __get_page_data(self) -> bs4.BeautifulSoup:
"""Scrape the table from top dex exchanges page data and return
the scraped data.
Raises:
ScrapeError: Raised when data cannot be scraped from the webpage.
Returns:
bs4.BeautifulSoup: Scraped page data.
"""
driver = webdriver.Chrome(
service=self.service,
options=self.driver_options,
service_log_path=os.devnull,
)
try:
driver.get(self.base_url)
driver.execute_script("window.scrollTo(0, document.body.scrollHeight)")
time.sleep(1)
result = driver.find_element(
By.XPATH,
'//*[@id="__next"]/div/div[1]/div[2]/div/div/div[2]/table/tbody',
)
page_data = result.get_attribute("innerHTML")
driver.quit()
soup = BeautifulSoup(page_data, features="lxml")
return soup
except:
raise ScrapeError
@property
def get_data(self) -> Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]:
"""Scrape exchanges names and ranks from data returned by
__get_page_data() method.
Returns:
Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]: Exchange platform rankings.
"""
dex: Dict[int, Any] = {}
page_data = self.__get_page_data
data = page_data.find_all("tr")
for rank, content in enumerate(data):
td = content.find_all("td")[1]
try:
name: str = td.find("p", class_="sc-1eb5slv-0 iworPT").text
except:
name: str = td.text # type: ignore
cmc_link: str = td.find("a", class_="cmc-link")["href"]
result = {
"name": name,
"cmc_link": cmc_link,
"cmc_name": cmc_link.split("/")[-2],
"url": self.cmc_url + cmc_link,
"timestamp": datetime.now(),
}
if self.out:
dex[rank + 1] = result
else:
dex[rank + 1] = DexData(**result)
return dexClasses
class Dex (proxy: Optional[str] = None, as_dict: bool = False)-
Class for scraping the data of top dex exchanges.
Args
proxy:Optional[str], optional- Proxy to be used for Selenium and requests Session. Defaults to None.
as_dict:bool- Return the data as a dictionary. Defaults to False.
Expand source code
class Dex(CMCBaseClass): """Class for scraping the data of top dex exchanges.""" def __init__(self, proxy: Optional[str] = None, as_dict: bool = False) -> None: """ Args: proxy (Optional[str], optional): Proxy to be used for Selenium and requests Session. Defaults to None. as_dict (bool): Return the data as a dictionary. Defaults to False. """ super().__init__(proxy) self.base_url = "https://coinmarketcap.com/rankings/exchanges/dex/" self.out = as_dict @property def __get_page_data(self) -> bs4.BeautifulSoup: """Scrape the table from top dex exchanges page data and return the scraped data. Raises: ScrapeError: Raised when data cannot be scraped from the webpage. Returns: bs4.BeautifulSoup: Scraped page data. """ driver = webdriver.Chrome( service=self.service, options=self.driver_options, service_log_path=os.devnull, ) try: driver.get(self.base_url) driver.execute_script("window.scrollTo(0, document.body.scrollHeight)") time.sleep(1) result = driver.find_element( By.XPATH, '//*[@id="__next"]/div/div[1]/div[2]/div/div/div[2]/table/tbody', ) page_data = result.get_attribute("innerHTML") driver.quit() soup = BeautifulSoup(page_data, features="lxml") return soup except: raise ScrapeError @property def get_data(self) -> Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]: """Scrape exchanges names and ranks from data returned by __get_page_data() method. Returns: Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]: Exchange platform rankings. """ dex: Dict[int, Any] = {} page_data = self.__get_page_data data = page_data.find_all("tr") for rank, content in enumerate(data): td = content.find_all("td")[1] try: name: str = td.find("p", class_="sc-1eb5slv-0 iworPT").text except: name: str = td.text # type: ignore cmc_link: str = td.find("a", class_="cmc-link")["href"] result = { "name": name, "cmc_link": cmc_link, "cmc_name": cmc_link.split("/")[-2], "url": self.cmc_url + cmc_link, "timestamp": datetime.now(), } if self.out: dex[rank + 1] = result else: dex[rank + 1] = DexData(**result) return dexAncestors
Instance variables
var get_data : Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]-
Scrape exchanges names and ranks from data returned by __get_page_data() method.
Returns
Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]- Exchange platform rankings.
Expand source code
@property def get_data(self) -> Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]: """Scrape exchanges names and ranks from data returned by __get_page_data() method. Returns: Union[Dict[int, Dict[str, Any]], Dict[int, DexData]]: Exchange platform rankings. """ dex: Dict[int, Any] = {} page_data = self.__get_page_data data = page_data.find_all("tr") for rank, content in enumerate(data): td = content.find_all("td")[1] try: name: str = td.find("p", class_="sc-1eb5slv-0 iworPT").text except: name: str = td.text # type: ignore cmc_link: str = td.find("a", class_="cmc-link")["href"] result = { "name": name, "cmc_link": cmc_link, "cmc_name": cmc_link.split("/")[-2], "url": self.cmc_url + cmc_link, "timestamp": datetime.now(), } if self.out: dex[rank + 1] = result else: dex[rank + 1] = DexData(**result) return dex