前言

目前創(chuàng)新互聯(lián)建站已為上1000+的企業(yè)提供了網(wǎng)站建設(shè)、域名、虛擬空間、綿陽服務(wù)器托管、企業(yè)網(wǎng)站設(shè)計(jì)、龍南網(wǎng)站維護(hù)等服務(wù)，公司將堅(jiān)持客戶導(dǎo)向、應(yīng)用為本的策略，正道將秉承"和諧、參與、激情"的文化，與客戶和合作伙伴齊心協(xié)力一起成長，共同發(fā)展。

簡單學(xué)習(xí)過網(wǎng)絡(luò)爬蟲,只是之前都是照著書上做并發(fā),大概能理解,卻還是無法自己用到自己項(xiàng)目中,這里自己研究實(shí)現(xiàn)一個(gè)網(wǎng)頁嗅探HTML5播放控件中基于m3u8協(xié)議ts格式視頻資源的項(xiàng)目,并未考慮過復(fù)雜情況,畢竟只是練練手.

源碼

# coding=utf-8
import asyncio
import multiprocessing
import os
import re
import time
from math import floor
from multiprocessing import Manager
import aiohttp
import requests
from lxml import html
import threading
from src.my_lib import retry
from src.my_lib import time_statistics


class M3U8Download:
 _path = "./resource\\" # 本地文件路徑
 _url_seed = None # 資源所在鏈接前綴
 _target_url = {} # 資源任務(wù)目標(biāo)字典
 _mode = ""
 _headers = {"User-agent": "Mozilla/5.0"} # 瀏覽器代理
 _target_num = 100

 def __init__(self):
 self._ml = Manager().list() # 進(jìn)程通信列表
 if not os.path.exists(self._path): # 檢測本地目錄存在否
  os.makedirs(self._path)
 exec_str = r'chcp 65001'
 os.system(exec_str) # 先切換utf-8輸出,防止控制臺(tái)亂碼

 def sniffing(self, url):
 self._url = url
 print("開始嗅探...")
 try:
  r = requests.get(self._url) # 訪問嗅探網(wǎng)址,獲取網(wǎng)頁信息
 except:
  print("嗅探失敗,網(wǎng)址不正確")
  os.system("pause")
 else:
  tree = html.fromstring(r.content)
  try:
  source_url = tree.xpath('//video//source/@src')[0] # 嗅探資源控制文件鏈接,這里只針對一個(gè)資源控制文件
  # self._url_seed = re.split("/\w+\.m3u8", source_url)[0] # 從資源控制文件鏈接解析域名
  except:
  print("嗅探失敗,未發(fā)現(xiàn)資源")
  os.system("pause")
  else:
  self.analysis(source_url)

 def analysis(self, source_url):
 try:
  self._url_seed = re.split("/\w+\.m3u8", source_url)[0] # 從資源控制文件鏈接解析域名
  with requests.get(source_url) as r: # 訪問資源控制文件,獲得資源信息
  src = re.split("\n*#.+\n", r.text) # 解析資源信息
  for sub_src in src: # 將資源地址儲(chǔ)存到任務(wù)字典
   if sub_src:
   self._target_url[sub_src] = self._url_seed + "/" + sub_src
 except Exception as e:
  print("資源無法成功解析", e)
  os.system("pause")
 else:
  self._target_num = len(self._target_url)
  print("sniffing success!!!,found", self._target_num, "url.")
  self._mode = input(
  "1:-> 單進(jìn)程(Low B)\n2:-> 多進(jìn)程+多線程(網(wǎng)速開始biubiu飛起!)\n3:-> 多進(jìn)程+協(xié)程(最先進(jìn)的并發(fā)!!!)\n")
  if self._mode == "1":
  for path, url in self._target_url.items():
   self._download(path, url)
  elif self._mode == "2" or self._mode == "3":
  self._multiprocessing()

 def _multiprocessing(self, processing_num=4): # 多進(jìn)程,多線程
 target_list = {} # 進(jìn)程任務(wù)字典,儲(chǔ)存每個(gè)進(jìn)程分配的任務(wù)
 pool = multiprocessing.Pool(processes=processing_num) # 開啟進(jìn)程池
 i = 0 # 任務(wù)分配標(biāo)識
 for path, url in self._target_url.items(): # 分配進(jìn)程任務(wù)
  target_list[path] = url
  i += 1
  if i % 10 == 0 or i == len(self._target_url): # 每個(gè)進(jìn)程分配十個(gè)任務(wù)
  if self._mode == "2":
   pool.apply_async(self._sub_multithreading, kwds=target_list) # 使用多線程驅(qū)動(dòng)方法
  else:
   pool.apply_async(self._sub_coroutine, kwds=target_list) # 使用協(xié)程驅(qū)動(dòng)方法
  target_list = {}
 pool.close() # join函數(shù)等待所有子進(jìn)程結(jié)束
 pool.join() # 調(diào)用join之前，先調(diào)用close函數(shù)，否則會(huì)出錯(cuò)。執(zhí)行完close后不會(huì)有新的進(jìn)程加入到pool
 while True:
  if self._judge_over():
  self._combine()
  break

 def _sub_multithreading(self, **kwargs):
 for path, url in kwargs.items(): # 根據(jù)進(jìn)程任務(wù)開啟線程
  t = threading.Thread(target=self._download, args=(path, url,))
  t.start()

 @retry()
 def _download(self, path, url): # 同步下載方法
 with requests.get(url, headers=self._headers) as r:
  if r.status_code == 200:
  with open(self._path + path, "wb")as file:
   file.write(r.content)
  self._ml.append(0) # 每成功一個(gè)就往進(jìn)程通信列表增加一個(gè)值
  percent = '%.2f' % (len(self._ml) / self._target_num * 100)
  print(len(self._ml), ": ", path, "->OK", "\tcomplete:", percent, "%") # 顯示下載進(jìn)度
  else:
  print(path, r.status_code, r.reason)

 def _sub_coroutine(self, **kwargs):
 tasks = []
 for path, url in kwargs.items(): # 根據(jù)進(jìn)程任務(wù)創(chuàng)建協(xié)程任務(wù)列表
  tasks.append(asyncio.ensure_future(self._async_download(path, url)))
 loop = asyncio.get_event_loop() # 創(chuàng)建異步事件循環(huán)
 loop.run_until_complete(asyncio.wait(tasks)) # 注冊任務(wù)列表

 async def _async_download(self, path, url): # 異步下載方法
 async with aiohttp.ClientSession() as session:
  async with session.get(url, headers=self._headers) as resp:
  try:
   assert resp.status == 200, "E" # 斷言狀態(tài)碼為200,否則拋異常,觸發(fā)重試裝飾器
   with open(self._path + path, "wb")as file:
   file.write(await resp.read())
  except Exception as e:
   print(e)
  else:
   self._ml.append(0) # 每成功一個(gè)就往進(jìn)程通信列表增加一個(gè)值
   percent = '%.2f' % (len(self._ml) / self._target_num * 100)
   print(len(self._ml), ": ", path, "->OK", "\tcomplete:", percent, "%") # 顯示下載進(jìn)度

 def _combine(self): # 組合資源方法
 try:
  print("開始組合資源...")
  identification = str(floor(time.time()))
  exec_str = r'copy /b "' + self._path + r'*.ts" "' + self._path + 'video' + identification + '.mp4"'
  os.system(exec_str) # 使用cmd命令將資源整合
  exec_str = r'del "' + self._path + r'*.ts"'
  os.system(exec_str) # 刪除原來的文件
 except:
  print("資源組合失敗")
 else:
  print("資源組合成功!")

 def _judge_over(self): # 判斷是否全部下載完成
 if len(self._ml) == len(self._target_url):
  return True
 return False


@time_statistics
def app():
 multiprocessing.freeze_support()
 url = input("輸入嗅探網(wǎng)址:\n")
 m3u8 = M3U8Download()
 m3u8.sniffing(url)
 # m3u8.analysis(url)


if __name__ == "__main__":
 app()

網(wǎng)頁標(biāo)題：python爬取基于m3u8協(xié)議的ts文件并合并-創(chuàng)新互聯(lián)
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