获取 etherscan网站中最新的500条智能合约
导入python所需各种标准库,如:
pip install beautifulsoup4
运行环境Python3.7
SmartContactSpider.py
# -*- coding: utf8 -*-
import requests
from bs4 import BeautifulSoup
import traceback
import re
import os
import time
import datetime
def printtime():
print(time.strftime("%Y-%m-%d %H:%M:%S:", time.localtime()), end=' ')
return 0
def getsccodecore(eachLine):
# 伪装成浏览器
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.87 Safari/537.36'}
failedTimes = 100
while True: # 在制定次数内一直循环,直到访问站点成功
if (failedTimes <= 0):
printtime()
print("失败次数过多,请检查网络环境!")
break
failedTimes -= 1
try:
# 以下except都是用来捕获当requests请求出现异常时,
# 通过捕获然后等待网络情况的变化,以此来保护程序的不间断运行
printtime()
eachLineurl = eachLine[:80]
print('正在连接的的网址链接是 ' + eachLineurl)
response = requests.get(eachLineurl, headers=headers, timeout=5)
break
except requests.exceptions.ConnectionError:
printtime()
print('ConnectionError!请等待3秒!')
time.sleep(3)
except requests.exceptions.ChunkedEncodingError:
printtime()
print('ChunkedEncodingError!请等待3秒!')
time.sleep(3)
except:
printtime()
print('Unfortunitely,出现未知错误!请等待3秒!')
time.sleep(3)
response.encoding = response.apparent_encoding
soup = BeautifulSoup(response.text, "html.parser")
targetPRE = soup.find_all('pre', 'js-sourcecopyarea editor')
filepath = "E:\\SmartContract\\code\\"
# filename 从address.txt文档中截取;从第34位到75位
# filename为合约地址 '0x5f3ed22b53ac0a001f0feedc2a3985999377c2ab'
filename = eachLine[33:75]
if (os.path.exists(filepath + filename + '.sol')):
printtime()
print(filename + '.sol已存在!')
return 0
fo = open(filepath + filename + '.sol', "w+", encoding="utf-8");
fo.write(targetPRE[0].text)
fo.close()
printtime()
print(filename + '.sol新建完成!')
return 0
def getsccode():
try:
SCAddress = open("E:\\SmartContract\\address\\address.txt", "r")
except:
printtime()
print('打开智能合约URL地址仓库错误!请检查文件目录是否正确!')
# 一行一行的读取 address.txt 的内容
for eachLine in SCAddress:
# print("test:" + eachLine[:80])
# address.txt每一行前80字段 https://cn.etherscan.com/address/0xEeE690AAA67d1eE33365c02C3Bf477A93867052f#code
getsccodecore(eachLine) # 这个才是获取智能合约代码的核心函数
SCAddress.close()
return 0
def getSCAddress(eachurl, filepath):
# 伪装成某种浏览器,防止被服务器拒绝服务
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.87 Safari/537.36'}
# 设置访问网址失败的最高次数,达到制定次数后,报告错误,停止程序
failedTimes = 50
while True: # 一直循环,直到在制定的次数内访问站点成功
if (failedTimes <= 0):
printtime()
print("失败次数过多,请检查网络环境!")
break
failedTimes -= 1 # 每执行一次就要减1
try:
# 以下except都是用来捕获当requests请求出现异常时,
# 通过捕获然后等待网络情况的变化,以此来保护程序的不间断运行
print('正在连接的的网址链接是 ' + eachurl )
response = requests.get(url=eachurl, headers=headers, timeout=5)
# 执行到这一句意味着成功访问,于是退出while循环
break
except requests.exceptions.ConnectionError:
printtime()
print('ConnectionError!请等待3秒!')
time.sleep(3)
except requests.exceptions.ChunkedEncodingError:
printtime()
print('ChunkedEncodingError!请等待3秒!')
time.sleep(3)
except:
printtime()
print('出现未知错误!请等待3秒!')
time.sleep(3)
# 转换成UTF-8编码
response.encoding = response.apparent_encoding
# 煲汤 爬虫解析
soup = BeautifulSoup(response.text, "html.parser")
# 查找这个字段,这个字段下,包含智能合约代码的URL地址
targetDiv = soup.find_all('div','table-responsive mb-2 mb-md-0')
try:
targetTBody = targetDiv[0].table.tbody
except:
printtime()
print("targetTBody未成功获取!")
return 1
# 以追加的方式打开文件。
# 如果文件不存在,则新建;如果文件已存在,则在文件指针末尾追加
fo = open(filepath + "address.txt", "a")
# 把每一个地址,都写到文件里面保存下来
for targetTR in targetTBody:
# 获取每一行
if targetTR.name == 'tr':
# 获取一行所有列信息
data = targetTR.find_all('td')
Address = data[0].getText()
Name = data[1].getText()
Compiler = data[2].getText()
Version = data[3].getText()
Balance = data[4].getText()
fo.write("https://cn.etherscan.com" + targetTR.td.find('a', 'hash-tag text-truncate').attrs['href']
+ '==>ContractName:' + Name + '==>Version:' + Version + '==>Balance:' + Balance + "\n")
fo.close()
return 0
def updatescurl():
# 最新500条合约信息
urlList = ["https://cn.etherscan.com/contractsVerified/1?ps=100",
"https://cn.etherscan.com/contractsVerified/2?ps=100",
"https://cn.etherscan.com/contractsVerified/3?ps=100",
"https://cn.etherscan.com/contractsVerified/4?ps=100",
"https://cn.etherscan.com/contractsVerified/5?ps=100"]
# filepath是保存要爬取的智能合约地址的文件的存放路径
filepath = 'E:\\SmartContract\\address\\'
# 把旧的存放合约地址的文件清除干净
try:
if (os.path.exists(filepath + "address.txt")):
os.remove(filepath + "address.txt")
printtime()
print('已清除%s目录下的旧文件(仓库)!' % filepath)
except IOError:
printtime()
print("出现一个不能处理的错误,终止程序:IOError!")
# 函数不正常执行,返回1
return 1
# 读取urlList里的每一个URL网页里的智能合约地址
for eachurl in urlList:
time = 0
while( 1 == getSCAddress(eachurl, filepath)):
time += 1
if(time == 10):
break
pass
# 函数正常执行,返回0
return 0
def main():
# 更新要爬取的智能合约的地址
updatescurl()
# 根据智能合约的地址去爬取智能合约的代码
getsccode()
main()