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28 lines
769 B
Python
28 lines
769 B
Python
"""订阅 Chain 的惰性稳定公开入口。"""
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from importlib import import_module
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from typing import Any
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_EXPORTS = {
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"SubscribeChain": ("app.chain.subscribe.facade", "SubscribeChain"),
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}
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def __getattr__(name: str) -> Any:
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"""首次访问时解析稳定 Chain 类型，避免包初始化形成反向依赖。"""
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contract = _EXPORTS.get(name)
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if contract is None:
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raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
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module_name, symbol_name = contract
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value = getattr(import_module(module_name), symbol_name)
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globals()[name] = value
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return value
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def __dir__() -> list[str]:
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"""向交互式工具暴露稳定公开面。"""
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return sorted({*globals(), *_EXPORTS})
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__all__ = ["SubscribeChain"]
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