nonebot2/nonebot/exception.py

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"""本模块包含了所有 NoneBot 运行时可能会抛出的异常。
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这些异常并非所有需要用户处理 NoneBot 内部运行时被捕获并进行对应操作
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```bash
NoneBotException
ParserExit
ProcessException
| IgnoredException
| SkippedException
| | TypeMisMatch
| MockApiException
| StopPropagation
MatcherException
| PausedException
| RejectedException
| FinishedException
AdapterException
| NoLogException
| ApiNotAvailable
| NetworkError
| ActionFailed
DriverException
WebSocketClosed
```
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FrontMatter:
sidebar_position: 10
description: nonebot.exception 模块
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"""
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from typing import Any, Optional
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from pydantic.fields import ModelField
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class NoneBotException(Exception):
"""所有 NoneBot 发生的异常基类。"""
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# Rule Exception
class ParserExit(NoneBotException):
"""{ref}`nonebot.rule.shell_command` 处理消息失败时返回的异常"""
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def __init__(self, status: int = 0, message: Optional[str] = None):
self.status = status
self.message = message
def __repr__(self):
return f"<ParserExit status={self.status} message={self.message}>"
def __str__(self):
return self.__repr__()
# Processor Exception
class ProcessException(NoneBotException):
"""事件处理过程中发生的异常基类。"""
class IgnoredException(ProcessException):
"""指示 NoneBot 应该忽略该事件。可由 PreProcessor 抛出。
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参数:
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reason: 忽略事件的原因
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"""
def __init__(self, reason: Any):
self.reason: Any = reason
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def __repr__(self):
return f"<IgnoredException, reason={self.reason}>"
def __str__(self):
return self.__repr__()
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class SkippedException(ProcessException):
"""指示 NoneBot 立即结束当前 `Dependent` 的运行。
例如可以在 `Handler` 中通过 {ref}`nonebot.matcher.Matcher.skip` 抛出
用法:
```python
def always_skip():
Matcher.skip()
@matcher.handle()
async def handler(dependency = Depends(always_skip)):
# never run
```
"""
class TypeMisMatch(SkippedException):
"""当前 `Handler` 的参数类型不匹配。"""
def __init__(self, param: ModelField, value: Any):
self.param: ModelField = param
self.value: Any = value
def __repr__(self):
return f"<TypeMisMatch, param={self.param}, value={self.value}>"
def __str__(self):
self.__repr__()
class MockApiException(ProcessException):
"""指示 NoneBot 阻止本次 API 调用或修改本次调用返回值,并返回自定义内容。可由 api hook 抛出。
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参数:
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result: 返回的内容
"""
def __init__(self, result: Any):
self.result = result
def __repr__(self):
return f"<ApiCancelledException, result={self.result}>"
def __str__(self):
return self.__repr__()
class StopPropagation(ProcessException):
"""指示 NoneBot 终止事件向下层传播。
{ref}`nonebot.matcher.Matcher.block` `True`
或使用 {ref}`nonebot.matcher.Matcher.stop_propagation` 方法时抛出
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用法:
```python
matcher = on_notice(block=True)
# 或者
@matcher.handle()
async def handler(matcher: Matcher):
matcher.stop_propagation()
```
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"""
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# Matcher Exceptions
class MatcherException(NoneBotException):
"""所有 Matcher 发生的异常基类。"""
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class PausedException(MatcherException):
"""指示 NoneBot 结束当前 `Handler` 并等待下一条消息后继续下一个 `Handler`。可用于用户输入新信息。
可以在 `Handler` 中通过 {ref}`nonebot.matcher.Matcher.pause` 抛出
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用法:
```python
@matcher.handle()
async def handler():
await matcher.pause("some message")
```
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"""
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class RejectedException(MatcherException):
"""指示 NoneBot 结束当前 `Handler` 并等待下一条消息后重新运行当前 `Handler`。可用于用户重新输入。
可以在 `Handler` 中通过 {ref}`nonebot.matcher.Matcher.reject` 抛出
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用法:
```python
@matcher.handle()
async def handler():
await matcher.reject("some message")
```
"""
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class FinishedException(MatcherException):
"""指示 NoneBot 结束当前 `Handler` 且后续 `Handler` 不再被运行。可用于结束用户会话。
可以在 `Handler` 中通过 {ref}`nonebot.matcher.Matcher.finish` 抛出
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用法:
```python
@matcher.handle()
async def handler():
await matcher.finish("some message")
```
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"""
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# Adapter Exceptions
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class AdapterException(NoneBotException):
"""代表 `Adapter` 抛出的异常,所有的 `Adapter` 都要在内部继承自这个 `Exception`
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参数:
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adapter_name: 标识 adapter
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"""
def __init__(self, adapter_name: str) -> None:
self.adapter_name: str = adapter_name
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class NoLogException(AdapterException):
"""指示 NoneBot 对当前 `Event` 进行处理但不显示 Log 信息。
可在 {ref}`nonebot.adapters.Event.get_log_string` 时抛出
"""
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class ApiNotAvailable(AdapterException):
"""在 API 连接不可用时抛出。"""
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class NetworkError(AdapterException):
"""在网络出现问题时抛出,如: API 请求地址不正确, API 请求无返回或返回状态非正常等。"""
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class ActionFailed(AdapterException):
"""API 请求成功返回数据,但 API 操作失败。"""
# Driver Exceptions
class DriverException(NoneBotException):
"""`Driver` 抛出的异常基类"""
class WebSocketClosed(DriverException):
"""WebSocket 连接已关闭"""
def __init__(self, code: int, reason: Optional[str] = None):
self.code = code
self.reason = reason
def __repr__(self) -> str:
return f"<WebSocketClosed code={self.code} reason={self.reason}>"