{"id":318507,"date":"2021-02-05T00:14:04","date_gmt":"2021-02-04T16:14:04","guid":{"rendered":"http:\/\/4563.org\/?p=318507"},"modified":"2021-02-05T00:14:04","modified_gmt":"2021-02-04T16:14:04","slug":"%e9%97%ae%e4%b8%80%e4%b8%aa%e5%85%b3%e4%ba%8e-asyncio-%e7%9a%84%e9%97%ae%e9%a2%98%ef%bc%8c%e5%bd%93%e5%a4%9a%e4%b8%aa-task-%e8%bf%90%e8%a1%8c%ef%bc%8c%e5%85%b6%e4%b8%ad%e4%b8%80%e4%b8%aa%e6%ad%a3","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=318507","title":{"rendered":"\u95ee\u4e00\u4e2a\u5173\u4e8e asyncio \u7684\u95ee\u9898\uff0c\u5f53\u591a\u4e2a task \u8fd0\u884c\uff0c\u5176\u4e2d\u4e00\u4e2a\u6b63\u786e\u8fd4\u56de\u540e\uff0c\u600e\u4e48\u53d6\u6d88\u5176\u4ed6\u534f\u7a0b\uff1f"},"content":{"rendered":"
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\u95ee\u4e00\u4e2a\u5173\u4e8e asyncio \u7684\u95ee\u9898\uff0c\u5f53\u591a\u4e2a task \u8fd0\u884c\uff0c\u5176\u4e2d\u4e00\u4e2a\u6b63\u786e\u8fd4\u56de\u540e\uff0c\u600e\u4e48\u53d6\u6d88\u5176\u4ed6\u534f\u7a0b\uff1f <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : dongcheng <\/span> <\/i> 5<\/span> <\/div>\n
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\u4e00\u4e2a\u7b80\u5355\u4f8b\u5b50 import asyncio import time<\/code><\/p>\n

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\u7279\u6b8a\u51fd\u6570<\/h1>\n

async def get_request(url): print('\u6b63\u5728\u4e0b\u8f7d',url) # time.sleep(2) \u4e0d\u652f\u6301\u5f02\u6b65\u7684\u6a21\u5757 \u4f1a\u4e2d\u65ad\u6574\u4e2a\u7684\u5f02\u6b65\u6548\u679c await asyncio.sleep(2) print('\u4e0b\u8f7d\u5b8c\u6210',url) return 'page_text' <\/p>\n

def parse(task): print(task.result())<\/p>\n

start = time.time() urls = ['www.xxx1.com','www.xxx2.com','www.xxx3.com']<\/p>\n

tasks = [] #\u5b58\u653e\u591a\u4efb\u52a1 for url in urls: # \u8c03\u7528\u7279\u6b8a\u51fd\u6570 func = get_request(url)<\/p>\n

# \u521b\u5efa\u4efb\u52a1\u5bf9\u8c61 task = asyncio.ensure_future(func)  # \u7ed9\u4efb\u52a1\u5bf9\u8c61\u7ed1\u5b9a\u56de\u8c03\u51fd\u6570 task.add_done_callback(parse) tasks.append(task) <\/code><\/pre>\n
\u521b\u5efa\u4e8b\u4ef6\u5faa\u73af\u5bf9\u8c61<\/h1>\n
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loop = asyncio.get_event_loop()<\/p>\n
\u6267\u884c\u4efb\u52a1<\/h1>\n
 <\/code><\/p>\n
loop.run_until_complete(asyncio.wait(tasks)) print('\u603b\u8017\u65f6:',time.time()-start) #2.0015313625335693 <\/code><\/p>\n
\u53ef\u4ee5\u5728 get_request \u5224\u65ad\u4efb\u52a1\u662f\u5426\u6210\u529f\uff0c\u4f46\u662f\u5982\u4f55\u5224\u65ad\u6210\u529f\u4e4b\u540e\u53d6\u6d88\u5176\u4ed6\u4efb\u52a1\u5462\uff1f<\/p>\n
\u8c22\u8c22<\/p>\n
 <\/code>  <\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (23<\/span>)        <\/div>\n
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     \u8cc7\u6df1\u5927\u4f6c : chanchancl <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5c06 func \u5305\u88c5\u6210\u4e00\u4e2a function<\/p>\n
    \u5728\u7ed3\u5c3e\u7684\u5730\u65b9\uff0c\u5c06 tasks \u4e2d\uff0c\u9664\u4e86\u81ea\u5df1\u7684 task \u90fd cancle \u6389                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : pursuer <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5982\u679c\u60f3\u8981\u8ba9\u534f\u7a0b\u63d0\u524d\u7ed3\u675f\u7b49\u5f85\uff0c\u53ef\u4ee5\u4f7f\u7528 asyncio.wait(…,return_when=’FIRST_COMPLETED’)\u6216\u8005\u66f4\u7075\u6d3b\u7684\u65b9\u6848 asyncio.Future\uff0c\u7136\u540e\u5904\u7406\u4e0b\u8d44\u6e90\u91ca\u653e                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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                                                                 @chanchancl \u8fd9\u4e2a func \u80fd\u83b7\u53d6\u5230 task \u5417\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : sujin190 <\/span>  <\/div>\n
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                                                                 \u4f60\u662f\u4e0d\u662f\u60f3\u9519\u4e86\uff0c\u5bf9\u4e8e\u534f\u7a0b\u6765\u8bf4\uff0c\u5982\u679c\u8bbe\u8ba1\u5230 io\uff0c\u90a3\u4e48\u5c31\u7b97\u80fd\u53d6\u6d88\u534f\u7a0b\u5176\u5b9e\u5e76\u4e0d\u80fd\u53d6\u6d88 io \u64cd\u4f5c<\/p>\n
    \u6bd4\u5982 http \u8bf7\u6c42\uff0c\u5c31\u7b97\u4f60\u8981\u53d6\u6d88\u534f\u7a0b\u5176\u5b9e\u5e76\u4e0d\u80fd\u53d6\u6d88\u5df2\u7ecf\u53d1\u9001\u51fa\u53bb\u7684 http \u8bf7\u6c42\uff0c\u53d6\u6d88\u534f\u7a0b\u5b8c\u5168\u6ca1\u6709\u610f\u4e49\uff0c\u5982\u679c\u4f60\u80fd\u53d6\u6d88 io\uff0c\u6bd4\u5982\u5173\u95ed http \u8fde\u63a5\u6765\u53d6\u6d88 http \u8bf7\u6c42\uff0c\u90a3\u4e48\u4f60\u5e94\u8be5\u901a\u8fc7\u5173\u95ed http \u8bf7\u6c42\u7684\u65b9\u5f0f\u6765\u89e6\u53d1\u534f\u7a0b\u8fd4\u56de\uff0c\u5373\u5148\u53d6\u6d88 io \u64cd\u4f5c\u518d\u7531 io \u5b8c\u6210\u6765\u89e6\u53d1\u534f\u7a0b\u8fd4\u56de\uff0c\u800c\u4e0d\u80fd\u5012\u8fc7\u6765<\/p>\n
    \u5bf9\u4e8e\u975e io \u8bf7\u6c42\uff0c\u518d\u6574\u4e2a\u534f\u7a0b\u5b8c\u6210\u524d\u4f1a\u72ec\u5360\u7ebf\u7a0b\uff0c\u5e76\u4e0d\u4f1a\u8c03\u5ea6\u5230\u5176\u4ed6\u534f\u7a0b\uff0c\u6240\u4ee5\u4f60\u81ea\u7136\u4e5f\u4e0d\u80fd\u7528\u5176\u4ed6\u534f\u7a0b\u6765\u53d6\u6d88\u5f53\u524d\u6b63\u5728\u8fd0\u884c\u7684\u534f\u7a0b\u4e86                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : keepeye <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0d\u662f\u6709 tasks \u5417\uff1f\u904d\u5386\u4e00\u4e0b\u90fd cancel \u6389                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : fiveelementgid <\/span>  <\/div>\n
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                                                                 \u770b\u89c1 Task \u548c continuation \u8fd8\u6fc0\u52a8\u4e86\u4e00\u4e0b\u4ee5\u4e3a\u6709. NET \u73a9\u5bb6\u4e00\u8d77\u7814\u7a76 TAP \u4e86\uff0c\u4e00\u770b\u662f Python\uff0c\u544a\u8f9e                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : sujin190 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5bf9\u4e8e\u975e io \u8bf7\u6c42\u534f\u7a0b\u518d\u8865\u5145\u4e00\u70b9\uff0c\u4f3c\u4e4e\u534f\u7a0b\u518d\u521b\u5efa\u7684\u65f6\u5019\u5c31\u4f1a\u8fdb\u884c\u9996\u6b21\u8fd0\u884c\uff0c\u6ca1 io \u64cd\u4f5c\uff0c\u6240\u4ee5\u9996\u6b21\u8fd0\u884c\u5fc5\u7136\u72ec\u5360\u7ebf\u7a0b\u4e00\u76f4\u5230\u8fd0\u884c\u5b8c\u6210\uff0c\u6240\u4ee5\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5b8c\u5168\u505a\u4e0d\u4e86\u4e2d\u9014\u53d6\u6d88\u7684\u64cd\u4f5c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : dongcheng <\/span>  <\/div>\n
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                                                                 @sujin190 \u5e94\u8be5\u53ef\u4ee5\u53d6\u6d88 task \u5427\u3002\u53ea\u662f\u6709\u5c40\u9650\u3002<\/p>\n
    @keepeye asyncio.Task.all_tasks()\u53ef\u4ee5\u83b7\u53d6 all task \u3002\u4f46\u662f\u73b0\u5728\u6709\u4e2a\u9700\u6c42\u662f\u5d4c\u5957\u7684 task\uff0c\u53ef\u4ee5\u53d6\u6d88\u6240\u6709 task\uff0c\u4e0d\u80fd\u53d6\u6d88\u7b2c 2 \u5c42\u7684 task \uff08\u4fdd\u7559\u7b2c\u4e00\u5c42\uff09                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : sujin190 <\/span>  <\/div>\n
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                                                                 @dongcheng #8 \u4f46\u662f\u6ca1\u610f\u4e49\uff0c\u4e0d\u7b26\u5408\u534f\u7a0b\u539f\u7406\u5b9e\u73b0\uff0c\u4ece\u7a0b\u5e8f\u7684\u53ef\u9760\u6027\u4e25\u8c28\u6027\u6765\u8bf4\u4e5f\u4e0d\u5e94\u8be5\u51fa\u73b0\u8fd9\u79cd\u8bbe\u8ba1\uff0c\u4e0d\u5173\u95ed io \u800c\u53d6\u6d88\u4e0a\u5c42\u534f\u7a0b\u662f\u5f88\u4e0d\u79d1\u5b66\u7684\uff0c\u5f88\u5bb9\u6613\u5bfc\u81f4 io \u3001\u8fde\u63a5\u6cc4\u9732\u5565\u7684\uff0c\u800c\u4e14\u8fd8\u4e0d\u5bb9\u6613\u6392\u67e5\u662f\u5565\u95ee\u9898                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : xiaoHuang3 <\/span>  <\/div>\n
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                                                                 @sujin190 \u9644\u8bae\uff5e\uff0c\u6211\u89c9\u5f97\u4e3b\u8fd9\u79cd\u9700\u6c42\u6839\u672c\u4e0d\u9002\u5408\u7528 asyncio \u6765\u505a- –                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : crclz <\/span>  <\/div>\n
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                                                                 @fiveelementgid .NET \u7684\u8bbe\u8ba1\u5c31\u5f88\u6e05\u6670\uff0cTAP \u3001cancellation token<\/p>\n
    \u5982\u679c\u662f.NET \u7684\u8bdd\uff0c\u5e94\u8be5\u628a\u4e00\u4e2a CancellationTokenSource \uff08 cts \uff09\u7684 CancellationToken \u4f20\u7ed9\u6240\u6709\u5f02\u6b65\u65b9\u6cd5\uff0c\u5f02\u6b65\u65b9\u6cd5\u4f1a\u8fd4\u56de task\uff0c\u518d\u7b49 Task.WhenAny \u8fd4\u56de\u540e\uff0c\u518d\u53d6\u6d88 cts \u3002<\/p>\n
    \u7531\u4e8e CancellationToken \u662f\u5c42\u5c42\u6df1\u5165\u7684\uff08 HTTP \u3001TCP \uff09\uff0c\u6240\u4ee5\u5e95\u5c42\u8d1f\u8d23 TCP \u7684\u4ee3\u7801\u4e5f\u4f1a\u53d6\u6d88\u6b63\u5728\u8fdb\u884c\u7684\u64cd\u4f5c\uff0c\u7136\u540e\u4f1a\u6254\u51fa\u4e00\u4e2a\u53d6\u6d88\u5f02\u5e38\uff0c\u6700\u540e\u6355\u83b7\u8fd9\u4e2a\u5f02\u5e38\u5c31\u884c\u4e86\uff08\u5728\u5f02\u6b65\u65b9\u6cd5\u4e2d\uff09\u3002<\/p>\n
    \u6211\u60f3 python \u7684\u95ee\u9898\u5c31\u662f\uff0c\u5e95\u5c42\u7684 api \u90fd\u6ca1\u6709\u63d0\u4f9b cancellation token \u7684\u53c2\u6570\uff0c\u5bfc\u81f4\u65e0\u6cd5\u8ba9\u53d6\u6d88\u64cd\u4f5c\u5c42\u5c42\u4f20\u64ad\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : abersheeran <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5199\u8fc7\u76f8\u5173\u4ee3\u7801\uff0c\u5728\u6211\u7684\u9879\u76ee\u91cc\u4f7f\u7528\u8fc7\u5f88\u4e45\uff0c\u4e00\u5207\u826f\u597d\u3002<\/p>\n
    https:\/\/gist.github.com\/abersheeran\/bd2372bb35fec859d7fca453ca5f7826