前言
簡(jiǎn)單學(xué)習(xí)過(guò)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(wú)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(yè)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(guò)復(fù)雜情況,畢竟只是練練手.
源碼
重慶分公司
重慶分公司
# 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(cè)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(kāi)始嗅探...")
try:
r = requests.get(self._url) # 訪問(wèn)嗅探網(wǎng)址,獲取網(wǎng)頁(yè)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(duì)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(wèn)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(wú)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(kāi)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(kāi)啟進(jìn)程池
i = 0 # 任務(wù)分配標(biāo)識(shí)
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(kāi)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(cè)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(kāi)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(lái)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() 
