在python中同时运行多个协程[Discord.py]

Question

我正在为我的朋友制作一个 discord 机器人，它会检查网站上是否有货，如果发现有货，则会向 discord 频道发送消息。我正在尝试同时运行 ne 和 bB 方法，并且彼此独立。当“await channel.send”行在各自的方法中运行时，我收到“超时上下文管理器应该在任务中使用”。此行应该 send 导致不和谐机器人向指定频道发送消息。否则它工作正常。我尝试按照不和谐文档将它们作为任务循环运行，但没有成功。我还研究了广泛的替代方法来实现相同的目标，但不断陷入死胡同。无论如何要在一个 .py 文件中实现这一点，还是我需要重写。诚然，我可能不明白线程或协程是如何工作的，但我自己也做了很多研究，现在正在寻求外部帮助。

这是我的代码。 （我已经审查了潜在的私人信息，例如不和谐频道 ID）

import time
import requests
import re
import discord
import threading
import random
import asyncio
from discord.ext import tasks


bbUrlList = []
neUrlList = []
neGpuList = []
neSkipList = {}

client = discord.Client()

with open("DiscordToken.txt",'r') as tokenFile:
    token = str(tokenFile.readline()).replace("Token=","")

with open("bb.txt",'r') as file:
        for line in file:
            bbUrlList.append(line.split(" ")[1])

with open("ne.txt",'r') as file:
        for line in file:
            neUrlList.append(line.split(" ")[1])
            neGpuList.append(line.split(" ")[0])

async def bB(channel):
    while True:
        for x in range(0,len(bbUrlList)):
            url = bbUrlList[x]
            headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36'}
            request = requests.get(url, headers=headers)
            request.encoding = "utf-8"
            text = request.text
            if re.search("add to cart", text, re.IGNORECASE) or re.search("see details", text, re.IGNORECASE):
                await channel.send("Bb appears to be dropping NOW!")
                print("[POSSIBLE DROP] Link:", bbUrlList[x])
                time.sleep(1800)
            else:
                print("[OUT OF STOCK] Link:", bbUrlList[x])
                time.sleep(random.randint(1,3))

async def ne(channel):
    while True:
        for x in range(0,len(neUrlList)):
            url = neUrlList[x]
            gpu = neGpuList[x]
            headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36'}
            request = requests.get(url, headers=headers)
            request.encoding = "utf-8"
            text = request.text
            if re.search("add to cart", text, re.IGNORECASE):
                if url in neSkipList:
                    print("[REPEAT STOCK] Link:", url, neSkipList[url], "Rotations left.")
                    neSkipList[url] -= 1
                    if neSkipList[url] <= 0:
                        neSkipList.pop(url)
                    time.sleep(random.randint(1,3))
                    continue
                await channel.send("There might be a {} at {}".format(neGpuList[x], neUrlList[x]))
                print("[POSSIBLE STOCK] Link:", neUrlList[x])
                neSkipList[url] = 2
                time.sleep(random.randint(1,3))
            else:
                print("[OUT OF STOCK] Link:", neUrlList[x])
                time.sleep(random.randint(1,3))
                
@client.event            
async def on_ready():
    channel = client.get_channel(################)
    threading.Thread(target=asyncio.run, args = (bB(channel),)).start()
    threading.Thread(target=asyncio.run, args = (ne(channel),)).start()

##Also tried the following
##asyncio.run_coroutine_threadsafe(ne(channel), #Something Here#)
##asyncio.run_coroutine_threadsafe(bB(channel), #Something Here#)



client.run(token)

Answer 1

我认为这没有按预期工作有两个主要原因，第一个是 requests 模块是为同步 IO 构建的，不能与异步正常工作。 [See here for more] 你可以尝试用类似aiohttp 的东西替换你的requests 模块。

其次，time.sleep() 是阻塞的，asyncio.sleep() 是非阻塞的。在异步循环的上下文中，asyncio 将告诉特定线程等待，而您的整个代码将被允许继续。

在您的代码中，这将放在一起看起来像：

import time
import re
import discord
import threading
import random
import asyncio
import aiohttp
from discord.ext import tasks


bbUrlList = []
neUrlList = []
neGpuList = []
neSkipList = {}

client = discord.Client()

with open("DiscordToken.txt",'r') as tokenFile:
    token = str(tokenFile.readline()).replace("Token=","")

with open("bb.txt",'r') as file:
        for line in file:
            bbUrlList.append(line.split(" ")[1])

with open("ne.txt",'r') as file:
        for line in file:
            neUrlList.append(line.split(" ")[1])
            neGpuList.append(line.split(" ")[0])

async def bB(channel):
    async with aiohttp.ClientSession() as session:
        while True:
            for x in range(0,len(bbUrlList)):
                url = bbUrlList[x]
                headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36'}
                async with session.get(url, headers=headers) as request:
                    text = await request.text()
                    if re.search("add to cart", text, re.IGNORECASE) or re.search("see details", text, re.IGNORECASE):
                        await channel.send("Bb appears to be dropping NOW!")
                        print("[POSSIBLE DROP] Link:", bbUrlList[x])
                        await asyncio.sleep(1800)
                    else:
                        print("[OUT OF STOCK] Link:", bbUrlList[x])
                        await asyncio.sleep(random.randint(1,3))

async def ne(channel):
    async with aiohttp.ClientSession() as session:
        while True:
            for x in range(0,len(neUrlList)):
                url = neUrlList[x]
                gpu = neGpuList[x]
                headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36'}
                async with session.get(url, headers=headers) as request:
                    text = await request.text()
                    if re.search("add to cart", text, re.IGNORECASE):
                        if url in neSkipList:
                            print("[REPEAT STOCK] Link:", url, neSkipList[url], "Rotations left.")
                            neSkipList[url] -= 1
                            if neSkipList[url] <= 0:
                                neSkipList.pop(url)
                            await asyncio.sleep(random.randint(1,3))
                            continue
                        await channel.send("There might be a {} at {}".format(neGpuList[x], neUrlList[x]))
                        print("[POSSIBLE STOCK] Link:", neUrlList[x])
                        neSkipList[url] = 2
                        await asyncio.sleep(random.randint(1,3))
                    else:
                        print("[OUT OF STOCK] Link:", neUrlList[x])
                        await asyncio.sleep(random.randint(1,3))
                
@client.event            
async def on_ready():
    channel = client.get_channel(################)
    threading.Thread(target=asyncio.run, args = (bB(channel),)).start()
    threading.Thread(target=asyncio.run, args = (ne(channel),)).start()


client.run(token)

我没有大量使用 aiohttp 的经验，因此请务必查看 its documentation 以根据您的特定需求进行定制。

祝你的项目好运！