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322 lines
9.2 KiB
322 lines
9.2 KiB
5 months ago
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from __future__ import annotations
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import socket
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import typing
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import warnings
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from email.errors import MessageDefect
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from http.client import IncompleteRead as httplib_IncompleteRead
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if typing.TYPE_CHECKING:
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from .connection import HTTPConnection
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from .connectionpool import ConnectionPool
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from .response import HTTPResponse
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from .util.retry import Retry
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# Base Exceptions
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class HTTPError(Exception):
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"""Base exception used by this module."""
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class HTTPWarning(Warning):
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"""Base warning used by this module."""
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_TYPE_REDUCE_RESULT = typing.Tuple[
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typing.Callable[..., object], typing.Tuple[object, ...]
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]
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class PoolError(HTTPError):
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"""Base exception for errors caused within a pool."""
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def __init__(self, pool: ConnectionPool, message: str) -> None:
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self.pool = pool
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super().__init__(f"{pool}: {message}")
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def __reduce__(self) -> _TYPE_REDUCE_RESULT:
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# For pickling purposes.
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return self.__class__, (None, None)
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class RequestError(PoolError):
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"""Base exception for PoolErrors that have associated URLs."""
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def __init__(self, pool: ConnectionPool, url: str, message: str) -> None:
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self.url = url
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super().__init__(pool, message)
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def __reduce__(self) -> _TYPE_REDUCE_RESULT:
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# For pickling purposes.
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return self.__class__, (None, self.url, None)
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class SSLError(HTTPError):
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"""Raised when SSL certificate fails in an HTTPS connection."""
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class ProxyError(HTTPError):
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"""Raised when the connection to a proxy fails."""
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# The original error is also available as __cause__.
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original_error: Exception
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def __init__(self, message: str, error: Exception) -> None:
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super().__init__(message, error)
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self.original_error = error
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class DecodeError(HTTPError):
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"""Raised when automatic decoding based on Content-Type fails."""
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class ProtocolError(HTTPError):
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"""Raised when something unexpected happens mid-request/response."""
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#: Renamed to ProtocolError but aliased for backwards compatibility.
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ConnectionError = ProtocolError
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# Leaf Exceptions
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class MaxRetryError(RequestError):
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"""Raised when the maximum number of retries is exceeded.
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:param pool: The connection pool
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:type pool: :class:`~urllib3.connectionpool.HTTPConnectionPool`
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:param str url: The requested Url
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:param reason: The underlying error
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:type reason: :class:`Exception`
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"""
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def __init__(
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self, pool: ConnectionPool, url: str, reason: Exception | None = None
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) -> None:
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self.reason = reason
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message = f"Max retries exceeded with url: {url} (Caused by {reason!r})"
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super().__init__(pool, url, message)
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class HostChangedError(RequestError):
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"""Raised when an existing pool gets a request for a foreign host."""
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def __init__(
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self, pool: ConnectionPool, url: str, retries: Retry | int = 3
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) -> None:
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message = f"Tried to open a foreign host with url: {url}"
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super().__init__(pool, url, message)
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self.retries = retries
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class TimeoutStateError(HTTPError):
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"""Raised when passing an invalid state to a timeout"""
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class TimeoutError(HTTPError):
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"""Raised when a socket timeout error occurs.
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Catching this error will catch both :exc:`ReadTimeoutErrors
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<ReadTimeoutError>` and :exc:`ConnectTimeoutErrors <ConnectTimeoutError>`.
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"""
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class ReadTimeoutError(TimeoutError, RequestError):
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"""Raised when a socket timeout occurs while receiving data from a server"""
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# This timeout error does not have a URL attached and needs to inherit from the
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# base HTTPError
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class ConnectTimeoutError(TimeoutError):
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"""Raised when a socket timeout occurs while connecting to a server"""
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class NewConnectionError(ConnectTimeoutError, HTTPError):
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"""Raised when we fail to establish a new connection. Usually ECONNREFUSED."""
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def __init__(self, conn: HTTPConnection, message: str) -> None:
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self.conn = conn
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super().__init__(f"{conn}: {message}")
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@property
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def pool(self) -> HTTPConnection:
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warnings.warn(
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"The 'pool' property is deprecated and will be removed "
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"in urllib3 v2.1.0. Use 'conn' instead.",
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DeprecationWarning,
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stacklevel=2,
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)
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return self.conn
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class NameResolutionError(NewConnectionError):
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"""Raised when host name resolution fails."""
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def __init__(self, host: str, conn: HTTPConnection, reason: socket.gaierror):
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message = f"Failed to resolve '{host}' ({reason})"
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super().__init__(conn, message)
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class EmptyPoolError(PoolError):
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"""Raised when a pool runs out of connections and no more are allowed."""
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class FullPoolError(PoolError):
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"""Raised when we try to add a connection to a full pool in blocking mode."""
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class ClosedPoolError(PoolError):
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"""Raised when a request enters a pool after the pool has been closed."""
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class LocationValueError(ValueError, HTTPError):
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"""Raised when there is something wrong with a given URL input."""
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class LocationParseError(LocationValueError):
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"""Raised when get_host or similar fails to parse the URL input."""
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def __init__(self, location: str) -> None:
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message = f"Failed to parse: {location}"
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super().__init__(message)
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self.location = location
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class URLSchemeUnknown(LocationValueError):
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"""Raised when a URL input has an unsupported scheme."""
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def __init__(self, scheme: str):
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message = f"Not supported URL scheme {scheme}"
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super().__init__(message)
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self.scheme = scheme
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class ResponseError(HTTPError):
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"""Used as a container for an error reason supplied in a MaxRetryError."""
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GENERIC_ERROR = "too many error responses"
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SPECIFIC_ERROR = "too many {status_code} error responses"
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class SecurityWarning(HTTPWarning):
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"""Warned when performing security reducing actions"""
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class InsecureRequestWarning(SecurityWarning):
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"""Warned when making an unverified HTTPS request."""
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class NotOpenSSLWarning(SecurityWarning):
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"""Warned when using unsupported SSL library"""
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class SystemTimeWarning(SecurityWarning):
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"""Warned when system time is suspected to be wrong"""
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class InsecurePlatformWarning(SecurityWarning):
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"""Warned when certain TLS/SSL configuration is not available on a platform."""
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class DependencyWarning(HTTPWarning):
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"""
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Warned when an attempt is made to import a module with missing optional
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dependencies.
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"""
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class ResponseNotChunked(ProtocolError, ValueError):
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"""Response needs to be chunked in order to read it as chunks."""
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class BodyNotHttplibCompatible(HTTPError):
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"""
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Body should be :class:`http.client.HTTPResponse` like
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(have an fp attribute which returns raw chunks) for read_chunked().
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"""
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class IncompleteRead(HTTPError, httplib_IncompleteRead):
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"""
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Response length doesn't match expected Content-Length
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Subclass of :class:`http.client.IncompleteRead` to allow int value
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for ``partial`` to avoid creating large objects on streamed reads.
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"""
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partial: int # type: ignore[assignment]
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expected: int
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def __init__(self, partial: int, expected: int) -> None:
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self.partial = partial
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self.expected = expected
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def __repr__(self) -> str:
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return "IncompleteRead(%i bytes read, %i more expected)" % (
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self.partial,
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self.expected,
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)
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class InvalidChunkLength(HTTPError, httplib_IncompleteRead):
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"""Invalid chunk length in a chunked response."""
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def __init__(self, response: HTTPResponse, length: bytes) -> None:
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self.partial: int = response.tell() # type: ignore[assignment]
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self.expected: int | None = response.length_remaining
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self.response = response
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self.length = length
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def __repr__(self) -> str:
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return "InvalidChunkLength(got length %r, %i bytes read)" % (
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self.length,
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self.partial,
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)
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class InvalidHeader(HTTPError):
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"""The header provided was somehow invalid."""
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class ProxySchemeUnknown(AssertionError, URLSchemeUnknown):
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"""ProxyManager does not support the supplied scheme"""
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# TODO(t-8ch): Stop inheriting from AssertionError in v2.0.
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def __init__(self, scheme: str | None) -> None:
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# 'localhost' is here because our URL parser parses
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# localhost:8080 -> scheme=localhost, remove if we fix this.
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if scheme == "localhost":
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scheme = None
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if scheme is None:
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message = "Proxy URL had no scheme, should start with http:// or https://"
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else:
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message = f"Proxy URL had unsupported scheme {scheme}, should use http:// or https://"
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super().__init__(message)
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class ProxySchemeUnsupported(ValueError):
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"""Fetching HTTPS resources through HTTPS proxies is unsupported"""
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class HeaderParsingError(HTTPError):
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"""Raised by assert_header_parsing, but we convert it to a log.warning statement."""
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def __init__(
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self, defects: list[MessageDefect], unparsed_data: bytes | str | None
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) -> None:
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message = f"{defects or 'Unknown'}, unparsed data: {unparsed_data!r}"
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super().__init__(message)
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class UnrewindableBodyError(HTTPError):
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"""urllib3 encountered an error when trying to rewind a body"""
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