asyncio的as_completed和socket ——》收集http响应实例

原因：as_completed：逐个返回结果

# asyncio 没有提供http协议的接口
import time
import asyncio
from urllib.parse import urlparse# 改成使用协程
async def get_url (url):all_lines = []# 通过socket请求html----------------------------------------------------------------------------------url = urlparse(url)host = url.netlocpath = url.pathif path == "":path = "/"# 建立socket连接---------------------------------------------------------------------------------------# open_connection 源码中调用了 yield from loop.create_connection 。# 这里实现的功能完成了 register 和 unregisterreader, writer = await asyncio.open_connection(host, 80)# write 方法完成 register 和 unregisterwriter.write("GET {} HTTP/1.1\r\nHost:{}\r\nConnection:close\r\n\r\n".format(path, host).encode("utf8"))# async for 语法，可以将读数据的方式异步化---------------------------------------------------------------async for raw_line in reader:all_lines.append(raw_line.decode("utf8"))return all_linesasync def main ():# 使用 tasks 放置 future 对象tasks = []for number in range(20):url = "http://shop.projectsedu.com/goods/{}/".format(number)# 使用 asyncio.ensure_future 包装协程，变成 Future 对象，从而获得协程的结果tasks.append(asyncio.ensure_future(get_url(url)))# 逐个返回结果for task in asyncio.as_completed(tasks):result = await taskprint(result)if __name__ == "__main__":start_time = time.time()loop = asyncio.get_event_loop()# 这儿重新定义了一个函数 main，从而实现 as_completed，即完成一个 task，打印一个 task# 在 main 中使用了 asyncio.as_completed，这和线程池中的 as_completed 效果一样loop.run_until_complete(main())print('last time:{}'.format(time.time() - start_time))

输出：

['HTTP/1.1 404 Not Found\r\n', 'Server: nginx/1.12.2\r\n', 'Date: Thu, 10 Oct 2019 02:54:24 GMT\r\n', 'Content-Type: application/json\r\n', 'Content-Length: 25\r\n', 'Connection: close\r\n', 'Vary: Accept, Cookie\r\n', 'Allow: GET, HEAD, OPTIONS\r\n', 'X-Frame-Options: SAMEORIGIN\r\n', '\r\n', '{"detail":"未找到。"}']
['HTTP/1.1 200 OK\r\n', 'Server: nginx/1.12.2\r\n', 'Date: Thu, 10 Oct 2019 02:54:24 GMT\r\n', 'Content-Type: application/json\r\n', 'Content-Length: 984\r\n', 'Connection: close\r\n', 'Vary: Accept, Cookie\r\n', 'Allow: GET, HEAD, OPTIONS\r\n', 'X-Frame-Options: SAMEORIGIN\r\n', '\r\n', '{"id":4,"category":{"id":129,"sub_cat":[],"name":"根茎类","code":"gjl","desc":"","category_type":2,"is_tab":false,"add_time":"2017-07-29T18:56:34","parent_category":110},"images":[{"image":"http://shop.projectsedu.com/media/goods/images/47_P_1448946213263.jpg"},{"image":"http://shop.projectsedu.com/media/goods/images/47_P_1448946213157.jpg"}],"goods_sn":"","name":"日本蒜蓉粉丝扇贝270克6只装","click_num":2866,"sold_num":0,"fav_num":-1,"goods_num":0,"market_price":156.0,"shop_price":108.0,"goods_brief":"","goods_desc":"<p><img src=\\"/media/goods/images/2_20170719161405_249.jpg\\" title=\\"\\" alt=\\"2.jpg\\"/></p><p><img src=\\"/media/goods/images/2_20170719161414_628.jpg\\" title=\\"\\" alt=\\"2.jpg\\"/></p><p><img src=\\"/media/goods/images/2_20170719161435_381.jpg\\" title=\\"\\" alt=\\"2.jpg\\"/></p>","ship_free":true,"goods_front_image":"http://shop.projectsedu.com/media/goods/images/47_P_1448946213263.jpg","is_new":false,"is_hot":false,"add_time":"2017-07-31T23:53:53"}']
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['HTTP/1.1 200 OK\r\n', 'Server: nginx/1.12.2\r\n', 'Date: Thu, 10 Oct 2019 02:54:24 GMT\r\n', 'Content-Type: application/json\r\n', 'Content-Length: 1678\r\n', 'Connection: close\r\n', 'Vary: Accept, Cookie\r\n', 'Allow: GET, HEAD, OPTIONS\r\n', 'X-Frame-Options: SAMEORIGIN\r\n', '\r\n', '{"id":5,"category":{"id":116,"sub_cat":[{"id":117,"sub_cat":[],"name":"参鲍","code":"cb","desc":"","category_type":3,"is_tab":false,"add_time":"2017-07-29T18:56:33","parent_category":116},{"id":118,"sub_cat":[],"name":"鱼","code":"yu","desc":"","category_type":3,"is_tab":false,"add_time":"2017-07-29T18:56:33","parent_category":116},{"id":119,"sub_cat":[],"name":"虾","code":"xia","desc":"","category_type":3,"is_tab":false,"add_time":"2017-07-29T18:56:33","parent_category":116},{"id":120,"sub_cat":[],"name":"蟹/贝","code":"xb","desc":"","category_type":3,"is_tab":false,"add_time":"2017-07-29T18:56:33","parent_category":116}],"name":"海鲜水产","code":"hxsc","desc":"","category_type":2,"is_tab":false,"add_time":"2017-07-29T18:56:33","parent_category":110},"images":[{"image":"http://shop.projectsedu.com/media/goods/images/10_P_1448944572085.jpg"},{"image":"http://shop.projectsedu.com/media/goods/images/10_P_1448944572532.jpg"},{"image":"http://shop.projectsedu.com/media/goods/images/10_P_1448944572872.jpg"}],"goods_sn":"","name":"内蒙新鲜牛肉1斤清真生鲜牛肉火锅食材","click_num":2767,"sold_num":0,"fav_num":0,"goods_num":0,"market_price":106.0,"shop_price":88.0,"goods_brief":"","goods_desc":"<p><img src=\\"/media/goods/images/2_20170719161405_249.jpg\\" title=\\"\\" alt=\\"2.jpg\\"/></p><p><img src=\\"/media/goods/images/2_20170719161414_628.jpg\\" title=\\"\\" alt=\\"2.jpg\\"/></p><p><img src=\\"/media/goods/images/2_20170719161435_381.jpg\\" title=\\"\\" alt=\\"2.jpg\\"/></p>","ship_free":true,"goods_front_image":"http://shop.projectsedu.com/media/goods/images/10_P_1448944572085.jpg","is_new":false,"is_hot":false,"add_time":"2017-07-31T23:53:53"}']
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