无法切换到不同的线程

Question

我正在尝试创建一个可以发送网页屏幕截图的电报机器人。

我使用 python-telegram-bot 来处理电报交互，并使用 python-playwright 来获取页面的屏幕截图。我的代码的问题是我在 Playwright 中遇到以下错误：

greenlet.error: cannot switch to a different thread

发生这种情况是因为我在调用电报命令时执行的函数之外声明了

browser = p.chromium.launch(headless=True, args=args)

。问题是，每次调用 telegram 命令时启动浏览器都会使我的代码速度减慢约 3 秒。我如何在全球范围内声明

browser

？还可能吗？

from telegram import InlineKeyboardButton, InlineKeyboardMarkup, ParseMode
from telegram.ext import Updater, CommandHandler, ChatMemberHandler, CallbackQueryHandler
from telegram.error import Unauthorized, BadRequest
from playwright.sync_api import sync_playwright

args = [
        "--no-sandbox",
        "--disable-setuid-sandbox",
        "--use-gl=egl",
    ]

p = sync_playwright().start()
browser = p.chromium.launch(headless=True, args=args)

def start(update, context):
    page = browser.new_page()
    page.goto("https://google.com")
    page.screenshot(path="example.png")
    page.close()
    context.bot.send_photo(chat_id=update.effective_chat.id, photo=open("example.png", "rb"))  


updater = Updater('2116084940:AAGxaA0wCwlg619UNstMeKzbuQVBoU-QCKA', use_context=True, workers=124)
updater.dispatcher.add_handler(CommandHandler('start', start, run_async=True))
updater.start_polling()
updater.idle()

Answer 1

我已经研究过了，并且我对你的代码做了很多更改，

我已经制作了一个机器人来尝试，直到成功完成为止。

我已将代码更改为async代码。

这是最后一个代码：

import telegram
from telegram import Update
from telegram.ext import MessageHandler, CommandHandler, Application, ContextTypes, filters
from playwright.async_api import async_playwright

args = [
        "--no-sandbox",
        "--disable-setuid-sandbox",
        "--use-gl=egl",
    ]


# Replace 'YOUR_API_TOKEN' with the API token you received from BotFather.
API_TOKEN = 'yours'


async def download_screan_shot(link="www.google.com", id_of_chat=None, update_to_use_it_to_send_the_file=None):
    file_name =f"{id_of_chat}_example.png"

    async with async_playwright() as p:
        browser = await p.chromium.launch()
        page = await browser.new_page()
        await page.goto(link)
        await page.screenshot(path=file_name)
        await browser.close()

    await update_to_use_it_to_send_the_file.message.reply_photo(file_name)



async def messages(update, context):
    the_gotten_message = update.message.text
    if "www" in the_gotten_message:
        await download_screan_shot(link=the_gotten_message, id_of_chat=update.message.from_user.id, update_to_use_it_to_send_the_file=update)
    else:
        await update.message.reply_text(update.message.text)


app = Application.builder().token(API_TOKEN).build()
app.add_handler(MessageHandler(filters.TEXT,messages))
app.run_polling()

这是我的机器人的屏幕截图：

我希望它对你有用。