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适用于 Graia 的 Playwright 管理器

Project description

GraiaX Playwright

适用于 Graia Project 的 Playwright 管理器

Code style: black Imports: isort License pdm-managed PyPI

Graiax Playwright 使用 launart 作为启动管理器, 适用于 AriadneAvilla

通过 GraiaX Playwright 你可以轻松地在 Ariadne / Avilla 启动的时候同时启动一个 Playwright,并在其退出的时候自动关闭 Playwright。

需要注意的是,Playwright 将会在运行期间保持后台常驻,
但由于并未开启任何页面,其内存占用量不是非常大(但也是可观的)。

安装

pdm add graiax-playwrightpoetry add graiax-playwright

我们强烈建议使用包管理器或虚拟环境

开始使用

以下教程以配合 Launart 使用为例。

机器人入口文件

from creart import create
from launart import Launart
from graia.ariadne.app import Ariadne
from graiax.playwright import PlaywrightService

launart = create(Launart)
launart.add_component(PlaywrightService("chromium")) # 默认值为 chromium
launart.add_component(PlaywrightService("chromium" user_data_dir="./browser_data"))  # 与上一行二选一,该方式使用 Persistent Context
...

launart.launch_blocking()

配合 Graia Saya 使用

from creart import create
from launart import Launart
from graia.ariadne.util.saya import listen
from graiax.playwright import PlaywrightService


@listen(...)
async def function(app: Ariadne):
    launart = create(Launart)
    pw_service = launart.get_component(PlaywrightService)

    async with pw_service.page(  # 此 API 启用了自动上下文管理
        viewport={"width": 800, "height": 10},
        device_scale_factor=1.5,
    ) as page:
        await page.set_content("Hello World!")
        img = await page.screenshot(type="jpeg", quality=80, full_page=True, scale="device")
    ...

高级用法之一

上面配合 Saya 使用的例子展示了创建一个页面的例子,但该页面默认与其他页面互相隔离(例如 cookie 等),假如我们需要一个与其他页面隔离的新页面,那么我们可以使用 page(use_global_context=False) 在创建页面时使用一个新的上下文,如下所示:

[!NOTE]
该种用法中的新上下文,仍受到 Playwright 启动参数的影响

如果你传入了例如 viewport 之类的只有新创建上下文或者新页面才支持的参数时,则会忽略 use_global_context 参数。此时若 without_new_contextTrue(默认行为),则将会直接使用浏览器实例创建新页面。 反之则会先创建新上下文再用新的上下文创建新页面,但是结束时新的页面和上下文都会被关闭。

更多信息详见:https://playwright.dev/python/docs/browser-contexts

@listen(...)
async def function(app: Ariadne):
    launart = create(Launart)
    pw_service = launart.get_component(PlaywrightService)
    async with pw_service.page(use_global_context=False) as page:  # 此 API 启用了自动上下文管理
        await page.set_content("Hello World!")
        img = await page.screenshot(type="jpeg", quality=80, full_page=True, scale="device")
    ...

高级用法之二

上面配合 Saya 使用的例子展示了为单个页面设置 viewport 的功能,自 GraiaX Playwright v0.3.1 版本起,可以在创建 PlaywrightService 时为全局的 Browser Context 指定 viewport,然后在截图时使用全局 Browser Context 截图,如下所示:

机器人入口文件:

launart.add_service(PlaywrightService("chromium"))

Saya 模块中:

from graiax.playwright import PlaywrightService


@listen(...)
async def function(app: Ariadne):
    launart = create(Launart)
    pw_service = manager.get_component(PlaywrightService)
    async with pw_service.context(...) as context:  # 此 API 启用了自动上下文管理
        page = context.new_page()
        try:
            await page.set_content("Hello World!")
            img = await page.screenshot(type="jpeg", quality=80, full_page=True, scale='device')
        finally:
            page.stop()
    ...

高级用法之三

通过依赖注入来获取 PlaywrightService,前面的代码中获取 PlaywrightService 都需要通过 Launart 的 get_component() 方法,你也可以通过自定义一个 BCC 的 Dispatcher 来实现依赖注入。

编写一个 Dispatcher

from graia.broadcast.entities.dispatcher import BaseDispatcher
from graia.broadcast.interfaces.dispatcher import DispatcherInterface

class CustomDispatcher(BaseDispatcher):
    @classmethod
    async def catch(cls, interface: DispatcherInterface):
        with contextlib.suppress(TypeError):
            if generic_isinstance(interface.event, Service):
                manager = Launart.current()
                return manager.get_component(interface.annotation)

在启动 Launart 之前获取一个 BCC 实例并对其应用这个 Dispatcher

from creart import it
from graia.broadcast import Broadcast

bcc = it(Broadcast)
bcc.finale_dispatchers.append(RedbotDispatcher)

...

launart.launch_blocking() # 或者是 avilla.launch()

之后用起来就很简单了,你可以对比一下有什么不同:

from graiax.playwright import PlaywrightService

@listen(...)
async def function(app: Ariadne, pw_service: PlaywrightService):
    async with pw_service.page(...) as page:
        ...

许可证

本项目使用 MIT 许可证进行许可。

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