browser-cli/browser_cli/async_sdk.py

"""Async browser-cli Python SDK.

The async SDK intentionally reuses the synchronous SDK namespaces instead of
copying every command method. Each async namespace is a thin adapter that runs
the corresponding sync SDK method in a worker thread, while a private command
sender dispatches commands through ``send_command_async``. That keeps command
strings, argument shapes, result mapping, and bound model creation in one place:
``browser_cli.sdk``.
"""
from __future__ import annotations

import asyncio
import functools
from collections.abc import Callable
from typing import TypeVar, cast

from browser_cli.models import Group, Tab
from browser_cli.sdk import NAMESPACE_NAMES
from browser_cli.sdk.workflow_decorators import WorkflowDecoratorsMixin, _NO_INJECT

F = TypeVar("F", bound=Callable)

class AsyncNamespaceAdapter:
  """Async wrapper around one synchronous SDK namespace."""

  def __init__(self, sync_namespace):
    self._sync = sync_namespace

  def __getattr__(self, name: str):
    value = getattr(self._sync, name)
    if not callable(value):
      return value

    @functools.wraps(value)
    async def wrapper(*args, **kwargs):
      return await asyncio.to_thread(value, *args, **kwargs)

    return wrapper

class AsyncDecoratorsNS(WorkflowDecoratorsMixin):
  """Async workflow decorators for :class:`AsyncBrowserCLI`.

  The public decorator methods are inherited from ``WorkflowDecoratorsMixin``;
  only the execution strategy differs: every wrapper is async and awaits both
  browser calls and async user functions.
  """

  def __init__(self, client: "AsyncBrowserCLI"):
    self._c = client

  @staticmethod
  async def _maybe_await(value):
    if hasattr(value, "__await__"):
      return await value
    return value

  def _value_decorator(
    self,
    func: F | None,
    get_value: Callable,
    *,
    keyword: str | None | object = "tab",
    cleanup: Callable | None = None,
  ):
    def decorator(fn: F) -> F:
      @functools.wraps(fn)
      async def wrapper(*args, **kwargs):
        value = await get_value()
        try:
          extra_args = ()
          if keyword is not _NO_INJECT:
            extra_args, kwargs = self._inject(kwargs, keyword, value)
          return await self._maybe_await(fn(*extra_args, *args, **kwargs))
        finally:
          if cleanup is not None:
            await self._maybe_await(cleanup(value))
      return cast(F, wrapper)
    return decorator(func) if func is not None else decorator

  def new_tab(
    self,
    url: str,
    *,
    wait: bool = False,
    timeout: float = 30.0,
    background: bool = False,
    focus: bool = False,
    window: str | None = None,
    group: str | None = None,
    close: bool = False,
    keyword: str | None = "tab",
  ):
    def open_tab():
      return self._c.tabs.open(
        url,
        wait=wait,
        timeout=timeout,
        background=background,
        focus=focus,
        window=window,
        group=group,
      )

    async def close_tab(tab):
      await self._c.tabs.close(tab.id)

    return self._value_decorator(None, open_tab, keyword=keyword, cleanup=close_tab if close else None)

  def performance_profile(self, profile: str, *, restore: bool = True):
    def decorator(fn: F) -> F:
      @functools.wraps(fn)
      async def wrapper(*args, **kwargs):
        previous = (await self._c.perf.status()).get("performanceProfile") if restore else None
        await self._c.perf.set_profile(profile)
        try:
          return await self._maybe_await(fn(*args, **kwargs))
        finally:
          if previous:
            await self._c.perf.set_profile(previous)
      return cast(F, wrapper)
    return decorator

  def retry(
    self,
    *,
    times: int = 3,
    delay: float = 0.0,
    exceptions: tuple[type[BaseException], ...] = (Exception,),
  ):
    attempts = max(1, times)

    def decorator(fn: F) -> F:
      @functools.wraps(fn)
      async def wrapper(*args, **kwargs):
        last_error = None
        for attempt in range(attempts):
          try:
            return await self._maybe_await(fn(*args, **kwargs))
          except exceptions as exc:
            last_error = exc
            if attempt == attempts - 1:
              raise
            if delay > 0:
              await asyncio.sleep(delay)
        raise cast(BaseException, last_error)
      return cast(F, wrapper)
    return decorator

class AsyncBrowserCLI:
  """Async client for a running browser.

  Namespace methods are awaitable mirrors of :class:`browser_cli.BrowserCLI`.
  """

  _NAMESPACES = NAMESPACE_NAMES

  def __init__(self, browser: str | None = None, remote: str | None = None, key: str | None = None):
    from browser_cli import BrowserCLI

    self._browser = browser
    self._remote = remote
    self._key = key if key else None
    self._sync = BrowserCLI(browser=browser, remote=remote, key=key, _command_sender=self._blocking_async_cmd)

    for name in self._NAMESPACES:
      setattr(self, name, AsyncNamespaceAdapter(getattr(self._sync, name)))
    self.decorators = AsyncDecoratorsNS(self)

  @property
  def browser(self) -> str | None:
    return self._browser

  @property
  def remote(self) -> str | None:
    return self._remote

  @property
  def key(self) -> str | None:
    return self._key

  def _blocking_async_cmd(
    self,
    command: str,
    args: dict | None = None,
    *,
    profile: str | None = None,
    remote: str | None = None,
    key: str | None = None,
  ):
    """Run the native async transport from a worker thread.

    Async namespace methods execute sync SDK logic in ``asyncio.to_thread``.
    Inside that worker thread, the sync SDK's injected command sender lands
    here and uses the async transport implementation without blocking the
    caller's event loop.
    """
    return asyncio.run(self._cmd(command, args, profile=profile, remote=remote, key=key))

  async def _cmd(
    self,
    command: str,
    args: dict | None = None,
    *,
    profile: str | None = None,
    remote: str | None = None,
    key: str | None = None,
  ):
    from browser_cli.client import send_command_async
    return await send_command_async(
      command,
      args,
      profile=self._browser if profile is None else profile,
      remote=self._remote if remote is None else remote,
      key=self._key if key is None else key,
    )

  async def command(self, command: str, args: dict | None = None):
    return await self._cmd(command, args or {})

  async def clients(self) -> list[dict]:
    return await self._cmd("clients.list", {})

  def tab_from(self, data: dict, *, browser_profile: str | None = None, browser_name: str | None = None, browser_remote: str | None = None) -> Tab:
    return self._sync.tab_from(
      data,
      browser_profile=browser_profile,
      browser_name=browser_name,
      browser_remote=browser_remote,
    )

  def group_from(self, data: dict, *, browser_profile: str | None = None, browser_name: str | None = None, browser_remote: str | None = None) -> Group:
    return self._sync.group_from(
      data,
      browser_profile=browser_profile,
      browser_name=browser_name,
      browser_remote=browser_remote,
    )