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import email.message
import json
import logging
import re
import zipfile
from typing import (
IO,
TYPE_CHECKING,
Collection,
Container,
Iterable,
Iterator,
List,
Optional,
Union,
)
from pip._vendor.packaging.requirements import Requirement
from pip._vendor.packaging.specifiers import InvalidSpecifier, SpecifierSet
from pip._vendor.packaging.utils import NormalizedName
from pip._vendor.packaging.version import LegacyVersion, Version
from pip._internal.models.direct_url import (
DIRECT_URL_METADATA_NAME,
DirectUrl,
DirectUrlValidationError,
)
from pip._internal.utils.compat import stdlib_pkgs # TODO: Move definition here.
from pip._internal.utils.egg_link import egg_link_path_from_sys_path
from pip._internal.utils.urls import url_to_path
if TYPE_CHECKING:
from typing import Protocol
else:
Protocol = object
DistributionVersion = Union[LegacyVersion, Version]
logger = logging.getLogger(__name__)
class BaseEntryPoint(Protocol):
@property
def name(self) -> str:
raise NotImplementedError()
@property
def value(self) -> str:
raise NotImplementedError()
@property
def group(self) -> str:
raise NotImplementedError()
class BaseDistribution(Protocol):
def __repr__(self) -> str:
return f"{self.raw_name} {self.version} ({self.location})"
def __str__(self) -> str:
return f"{self.raw_name} {self.version}"
@property
def location(self) -> Optional[str]:
"""Where the distribution is loaded from.
A string value is not necessarily a filesystem path, since distributions
can be loaded from other sources, e.g. arbitrary zip archives. ``None``
means the distribution is created in-memory.
Do not canonicalize this value with e.g. ``pathlib.Path.resolve()``. If
this is a symbolic link, we want to preserve the relative path between
it and files in the distribution.
"""
raise NotImplementedError()
@property
def editable_project_location(self) -> Optional[str]:
"""The project location for editable distributions.
This is the directory where pyproject.toml or setup.py is located.
None if the distribution is not installed in editable mode.
"""
# TODO: this property is relatively costly to compute, memoize it ?
direct_url = self.direct_url
if direct_url:
if direct_url.is_local_editable():
return url_to_path(direct_url.url)
else:
# Search for an .egg-link file by walking sys.path, as it was
# done before by dist_is_editable().
egg_link_path = egg_link_path_from_sys_path(self.raw_name)
if egg_link_path:
# TODO: get project location from second line of egg_link file
# (https://github.com/pypa/pip/issues/10243)
return self.location
return None
@property
def info_directory(self) -> Optional[str]:
"""Location of the .[egg|dist]-info directory.
Similarly to ``location``, a string value is not necessarily a
filesystem path. ``None`` means the distribution is created in-memory.
For a modern .dist-info installation on disk, this should be something
like ``{location}/{raw_name}-{version}.dist-info``.
Do not canonicalize this value with e.g. ``pathlib.Path.resolve()``. If
this is a symbolic link, we want to preserve the relative path between
it and other files in the distribution.
"""
raise NotImplementedError()
@property
def canonical_name(self) -> NormalizedName:
raise NotImplementedError()
@property
def version(self) -> DistributionVersion:
raise NotImplementedError()
@property
def direct_url(self) -> Optional[DirectUrl]:
"""Obtain a DirectUrl from this distribution.
Returns None if the distribution has no `direct_url.json` metadata,
or if `direct_url.json` is invalid.
"""
try:
content = self.read_text(DIRECT_URL_METADATA_NAME)
except FileNotFoundError:
return None
try:
return DirectUrl.from_json(content)
except (
UnicodeDecodeError,
json.JSONDecodeError,
DirectUrlValidationError,
) as e:
logger.warning(
"Error parsing %s for %s: %s",
DIRECT_URL_METADATA_NAME,
self.canonical_name,
e,
)
return None
@property
def installer(self) -> str:
raise NotImplementedError()
@property
def editable(self) -> bool:
return bool(self.editable_project_location)
@property
def local(self) -> bool:
raise NotImplementedError()
@property
def in_usersite(self) -> bool:
raise NotImplementedError()
@property
def in_site_packages(self) -> bool:
raise NotImplementedError()
def read_text(self, name: str) -> str:
"""Read a file in the .dist-info (or .egg-info) directory.
Should raise ``FileNotFoundError`` if ``name`` does not exist in the
metadata directory.
"""
raise NotImplementedError()
def iter_entry_points(self) -> Iterable[BaseEntryPoint]:
raise NotImplementedError()
@property
def metadata(self) -> email.message.Message:
"""Metadata of distribution parsed from e.g. METADATA or PKG-INFO."""
raise NotImplementedError()
@property
def metadata_version(self) -> Optional[str]:
"""Value of "Metadata-Version:" in distribution metadata, if available."""
return self.metadata.get("Metadata-Version")
@property
def raw_name(self) -> str:
"""Value of "Name:" in distribution metadata."""
# The metadata should NEVER be missing the Name: key, but if it somehow
# does, fall back to the known canonical name.
return self.metadata.get("Name", self.canonical_name)
@property
def requires_python(self) -> SpecifierSet:
"""Value of "Requires-Python:" in distribution metadata.
If the key does not exist or contains an invalid value, an empty
SpecifierSet should be returned.
"""
value = self.metadata.get("Requires-Python")
if value is None:
return SpecifierSet()
try:
# Convert to str to satisfy the type checker; this can be a Header object.
spec = SpecifierSet(str(value))
except InvalidSpecifier as e:
message = "Package %r has an invalid Requires-Python: %s"
logger.warning(message, self.raw_name, e)
return SpecifierSet()
return spec
def iter_dependencies(self, extras: Collection[str] = ()) -> Iterable[Requirement]:
"""Dependencies of this distribution.
For modern .dist-info distributions, this is the collection of
"Requires-Dist:" entries in distribution metadata.
"""
raise NotImplementedError()
def iter_provided_extras(self) -> Iterable[str]:
"""Extras provided by this distribution.
For modern .dist-info distributions, this is the collection of
"Provides-Extra:" entries in distribution metadata.
"""
raise NotImplementedError()
class BaseEnvironment:
"""An environment containing distributions to introspect."""
@classmethod
def default(cls) -> "BaseEnvironment":
raise NotImplementedError()
@classmethod
def from_paths(cls, paths: Optional[List[str]]) -> "BaseEnvironment":
raise NotImplementedError()
def get_distribution(self, name: str) -> Optional["BaseDistribution"]:
"""Given a requirement name, return the installed distributions."""
raise NotImplementedError()
def _iter_distributions(self) -> Iterator["BaseDistribution"]:
"""Iterate through installed distributions.
This function should be implemented by subclass, but never called
directly. Use the public ``iter_distribution()`` instead, which
implements additional logic to make sure the distributions are valid.
"""
raise NotImplementedError()
def iter_distributions(self) -> Iterator["BaseDistribution"]:
"""Iterate through installed distributions."""
for dist in self._iter_distributions():
# Make sure the distribution actually comes from a valid Python
# packaging distribution. Pip's AdjacentTempDirectory leaves folders
# e.g. ``~atplotlib.dist-info`` if cleanup was interrupted. The
# valid project name pattern is taken from PEP 508.
project_name_valid = re.match(
r"^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])$",
dist.canonical_name,
flags=re.IGNORECASE,
)
if not project_name_valid:
logger.warning(
"Ignoring invalid distribution %s (%s)",
dist.canonical_name,
dist.location,
)
continue
yield dist
def iter_installed_distributions(
self,
local_only: bool = True,
skip: Container[str] = stdlib_pkgs,
include_editables: bool = True,
editables_only: bool = False,
user_only: bool = False,
) -> Iterator[BaseDistribution]:
"""Return a list of installed distributions.
:param local_only: If True (default), only return installations
local to the current virtualenv, if in a virtualenv.
:param skip: An iterable of canonicalized project names to ignore;
defaults to ``stdlib_pkgs``.
:param include_editables: If False, don't report editables.
:param editables_only: If True, only report editables.
:param user_only: If True, only report installations in the user
site directory.
"""
it = self.iter_distributions()
if local_only:
it = (d for d in it if d.local)
if not include_editables:
it = (d for d in it if not d.editable)
if editables_only:
it = (d for d in it if d.editable)
if user_only:
it = (d for d in it if d.in_usersite)
return (d for d in it if d.canonical_name not in skip)
class Wheel(Protocol):
location: str
def as_zipfile(self) -> zipfile.ZipFile:
raise NotImplementedError()
class FilesystemWheel(Wheel):
def __init__(self, location: str) -> None:
self.location = location
def as_zipfile(self) -> zipfile.ZipFile:
return zipfile.ZipFile(self.location, allowZip64=True)
class MemoryWheel(Wheel):
def __init__(self, location: str, stream: IO[bytes]) -> None:
self.location = location
self.stream = stream
def as_zipfile(self) -> zipfile.ZipFile:
return zipfile.ZipFile(self.stream, allowZip64=True)
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