wehub-resource-sync
156 lines
4.8 KiB
Python
156 lines
4.8 KiB
Python
# Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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import os
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from typing import Generic, TypeVar
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from typing_extensions import Self
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T = TypeVar("T")
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def strtobool(val):
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val = val.lower()
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if val in ['y', 'yes', 't', 'true', 'on', '1']:
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return True
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elif val in ['n', 'no', 'f', 'false', 'off', '0']:
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return False
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else:
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raise ValueError(f"Invalid truth value {val!r}")
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class EnvironmentVariable(Generic[T]):
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name: str
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default: T
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def __init__(self, name: str, default: T):
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self.name = name
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self.default = default
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self._last_env_value: str | None = None
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self._cached_value: T | None = None
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def get(self) -> T:
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_current_env_value = os.getenv(self.name)
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if (
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self._cached_value is None
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or self._last_env_value != _current_env_value
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):
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self._cached_value = self.parse_from_string()
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self._last_env_value = _current_env_value
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return self._cached_value
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def set(self, value: T) -> None:
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os.environ[self.name] = self.convert_to_string(value)
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self._cached_value = value
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def parse_from_string(self) -> T:
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raise NotImplementedError
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def convert_to_string(self, value: T) -> str:
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raise NotImplementedError
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def delete(self) -> None:
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del os.environ[self.name]
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def __repr__(self) -> str:
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return f"Env({self.name}={self.get()!r})"
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class StringEnvironmentVariable(EnvironmentVariable[str]):
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def __init__(self, name: str, default: str):
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super().__init__(name, default)
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assert isinstance(default, str), "default must be a string"
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def parse_from_string(self) -> str:
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return os.getenv(self.name, self.default)
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def convert_to_string(self, value: str) -> str:
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assert isinstance(value, str), "value must be a string"
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return value
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class BooleanEnvironmentVariable(EnvironmentVariable[bool]):
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def __init__(self, name: str, default: bool):
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super().__init__(name, default)
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assert isinstance(default, bool), "default must be a boolean"
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def parse_from_string(self) -> bool:
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default = str(self.default)
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env_str = os.getenv(self.name, default)
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return strtobool(env_str)
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def convert_to_string(self, value: bool) -> str:
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assert isinstance(value, bool), "value must be a boolean"
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return str(value).lower()
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def __bool__(self) -> bool:
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raise ValueError(
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"BooleanEnvironmentVariable does not support bool(), "
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"please use get() instead."
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)
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class IntegerEnvironmentVariable(EnvironmentVariable[int]):
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def __init__(self, name: str, default: int):
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super().__init__(name, default)
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assert isinstance(default, int) and not isinstance(default, bool), (
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"default must be an integer"
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)
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def parse_from_string(self) -> int:
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try:
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return int(os.getenv(self.name, str(self.default)))
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except ValueError:
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return self.default
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def convert_to_string(self, value: int) -> str:
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assert isinstance(value, int) and not isinstance(value, bool), (
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"value must be an integer"
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)
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return str(value)
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class StringListEnvironmentVariable(EnvironmentVariable[list[str]]):
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def __init__(self, name: str, default: list[str]):
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super().__init__(name, default)
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assert isinstance(default, list), "default must be a list"
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def parse_from_string(self) -> list[str]:
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return os.getenv(self.name, ",".join(self.default)).split(",")
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def convert_to_string(self, value: list[str]) -> str:
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assert isinstance(value, list), "value must be a list"
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assert all(isinstance(x, str) for x in value), (
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"value must be a list of strings"
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)
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return ",".join(value)
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class EnvironmentVariableGuard(Generic[T]):
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variable: EnvironmentVariable[T]
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original_value: T
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def __init__(self, variable: EnvironmentVariable[T], value: T):
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self.variable = variable
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self.original_value = variable.get()
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self.variable.set(value)
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def __enter__(self) -> Self:
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return self
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def __exit__(self, exc_type, exc_value, traceback) -> None:
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self.variable.set(self.original_value)
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