OpenHome/venv/Lib/site-packages/pip/_internal/resolution/resolvelib/candidates.py
2021-07-21 21:33:05 +02:00

605 lines
20 KiB
Python

import logging
import sys
from typing import TYPE_CHECKING, Any, FrozenSet, Iterable, Optional, Tuple, Union, cast
from pip._vendor.packaging.specifiers import InvalidSpecifier, SpecifierSet
from pip._vendor.packaging.utils import NormalizedName, canonicalize_name
from pip._vendor.packaging.version import Version
from pip._vendor.packaging.version import parse as parse_version
from pip._vendor.pkg_resources import Distribution
from pip._internal.exceptions import HashError, MetadataInconsistent
from pip._internal.models.link import Link, links_equivalent
from pip._internal.models.wheel import Wheel
from pip._internal.req.constructors import (
install_req_from_editable,
install_req_from_line,
)
from pip._internal.req.req_install import InstallRequirement
from pip._internal.utils.misc import dist_is_editable, normalize_version_info
from pip._internal.utils.packaging import get_requires_python
from .base import Candidate, CandidateVersion, Requirement, format_name
if TYPE_CHECKING:
from .factory import Factory
logger = logging.getLogger(__name__)
BaseCandidate = Union[
"AlreadyInstalledCandidate",
"EditableCandidate",
"LinkCandidate",
]
def as_base_candidate(candidate: Candidate) -> Optional[BaseCandidate]:
"""The runtime version of BaseCandidate."""
base_candidate_classes = (
AlreadyInstalledCandidate,
EditableCandidate,
LinkCandidate,
)
if isinstance(candidate, base_candidate_classes):
return candidate
return None
def make_install_req_from_link(link, template):
# type: (Link, InstallRequirement) -> InstallRequirement
assert not template.editable, "template is editable"
if template.req:
line = str(template.req)
else:
line = link.url
ireq = install_req_from_line(
line,
user_supplied=template.user_supplied,
comes_from=template.comes_from,
use_pep517=template.use_pep517,
isolated=template.isolated,
constraint=template.constraint,
options=dict(
install_options=template.install_options,
global_options=template.global_options,
hashes=template.hash_options,
),
)
ireq.original_link = template.original_link
ireq.link = link
return ireq
def make_install_req_from_editable(link, template):
# type: (Link, InstallRequirement) -> InstallRequirement
assert template.editable, "template not editable"
return install_req_from_editable(
link.url,
user_supplied=template.user_supplied,
comes_from=template.comes_from,
use_pep517=template.use_pep517,
isolated=template.isolated,
constraint=template.constraint,
options=dict(
install_options=template.install_options,
global_options=template.global_options,
hashes=template.hash_options,
),
)
def make_install_req_from_dist(dist, template):
# type: (Distribution, InstallRequirement) -> InstallRequirement
project_name = canonicalize_name(dist.project_name)
if template.req:
line = str(template.req)
elif template.link:
line = f"{project_name} @ {template.link.url}"
else:
line = f"{project_name}=={dist.parsed_version}"
ireq = install_req_from_line(
line,
user_supplied=template.user_supplied,
comes_from=template.comes_from,
use_pep517=template.use_pep517,
isolated=template.isolated,
constraint=template.constraint,
options=dict(
install_options=template.install_options,
global_options=template.global_options,
hashes=template.hash_options,
),
)
ireq.satisfied_by = dist
return ireq
class _InstallRequirementBackedCandidate(Candidate):
"""A candidate backed by an ``InstallRequirement``.
This represents a package request with the target not being already
in the environment, and needs to be fetched and installed. The backing
``InstallRequirement`` is responsible for most of the leg work; this
class exposes appropriate information to the resolver.
:param link: The link passed to the ``InstallRequirement``. The backing
``InstallRequirement`` will use this link to fetch the distribution.
:param source_link: The link this candidate "originates" from. This is
different from ``link`` when the link is found in the wheel cache.
``link`` would point to the wheel cache, while this points to the
found remote link (e.g. from pypi.org).
"""
is_installed = False
def __init__(
self,
link, # type: Link
source_link, # type: Link
ireq, # type: InstallRequirement
factory, # type: Factory
name=None, # type: Optional[NormalizedName]
version=None, # type: Optional[CandidateVersion]
):
# type: (...) -> None
self._link = link
self._source_link = source_link
self._factory = factory
self._ireq = ireq
self._name = name
self._version = version
self.dist = self._prepare()
def __str__(self):
# type: () -> str
return f"{self.name} {self.version}"
def __repr__(self):
# type: () -> str
return "{class_name}({link!r})".format(
class_name=self.__class__.__name__,
link=str(self._link),
)
def __hash__(self):
# type: () -> int
return hash((self.__class__, self._link))
def __eq__(self, other):
# type: (Any) -> bool
if isinstance(other, self.__class__):
return links_equivalent(self._link, other._link)
return False
@property
def source_link(self):
# type: () -> Optional[Link]
return self._source_link
@property
def project_name(self):
# type: () -> NormalizedName
"""The normalised name of the project the candidate refers to"""
if self._name is None:
self._name = canonicalize_name(self.dist.project_name)
return self._name
@property
def name(self):
# type: () -> str
return self.project_name
@property
def version(self):
# type: () -> CandidateVersion
if self._version is None:
self._version = parse_version(self.dist.version)
return self._version
def format_for_error(self):
# type: () -> str
return "{} {} (from {})".format(
self.name,
self.version,
self._link.file_path if self._link.is_file else self._link,
)
def _prepare_distribution(self):
# type: () -> Distribution
raise NotImplementedError("Override in subclass")
def _check_metadata_consistency(self, dist):
# type: (Distribution) -> None
"""Check for consistency of project name and version of dist."""
canonical_name = canonicalize_name(dist.project_name)
if self._name is not None and self._name != canonical_name:
raise MetadataInconsistent(
self._ireq,
"name",
self._name,
dist.project_name,
)
parsed_version = parse_version(dist.version)
if self._version is not None and self._version != parsed_version:
raise MetadataInconsistent(
self._ireq,
"version",
str(self._version),
dist.version,
)
def _prepare(self):
# type: () -> Distribution
try:
dist = self._prepare_distribution()
except HashError as e:
# Provide HashError the underlying ireq that caused it. This
# provides context for the resulting error message to show the
# offending line to the user.
e.req = self._ireq
raise
self._check_metadata_consistency(dist)
return dist
def _get_requires_python_dependency(self):
# type: () -> Optional[Requirement]
requires_python = get_requires_python(self.dist)
if requires_python is None:
return None
try:
spec = SpecifierSet(requires_python)
except InvalidSpecifier as e:
message = "Package %r has an invalid Requires-Python: %s"
logger.warning(message, self.name, e)
return None
return self._factory.make_requires_python_requirement(spec)
def iter_dependencies(self, with_requires):
# type: (bool) -> Iterable[Optional[Requirement]]
requires = self.dist.requires() if with_requires else ()
for r in requires:
yield self._factory.make_requirement_from_spec(str(r), self._ireq)
yield self._get_requires_python_dependency()
def get_install_requirement(self):
# type: () -> Optional[InstallRequirement]
return self._ireq
class LinkCandidate(_InstallRequirementBackedCandidate):
is_editable = False
def __init__(
self,
link, # type: Link
template, # type: InstallRequirement
factory, # type: Factory
name=None, # type: Optional[NormalizedName]
version=None, # type: Optional[CandidateVersion]
):
# type: (...) -> None
source_link = link
cache_entry = factory.get_wheel_cache_entry(link, name)
if cache_entry is not None:
logger.debug("Using cached wheel link: %s", cache_entry.link)
link = cache_entry.link
ireq = make_install_req_from_link(link, template)
assert ireq.link == link
if ireq.link.is_wheel and not ireq.link.is_file:
wheel = Wheel(ireq.link.filename)
wheel_name = canonicalize_name(wheel.name)
assert name == wheel_name, f"{name!r} != {wheel_name!r} for wheel"
# Version may not be present for PEP 508 direct URLs
if version is not None:
wheel_version = Version(wheel.version)
assert version == wheel_version, "{!r} != {!r} for wheel {}".format(
version, wheel_version, name
)
if (
cache_entry is not None
and cache_entry.persistent
and template.link is template.original_link
):
ireq.original_link_is_in_wheel_cache = True
super().__init__(
link=link,
source_link=source_link,
ireq=ireq,
factory=factory,
name=name,
version=version,
)
def _prepare_distribution(self):
# type: () -> Distribution
return self._factory.preparer.prepare_linked_requirement(
self._ireq, parallel_builds=True
)
class EditableCandidate(_InstallRequirementBackedCandidate):
is_editable = True
def __init__(
self,
link, # type: Link
template, # type: InstallRequirement
factory, # type: Factory
name=None, # type: Optional[NormalizedName]
version=None, # type: Optional[CandidateVersion]
):
# type: (...) -> None
super().__init__(
link=link,
source_link=link,
ireq=make_install_req_from_editable(link, template),
factory=factory,
name=name,
version=version,
)
def _prepare_distribution(self):
# type: () -> Distribution
return self._factory.preparer.prepare_editable_requirement(self._ireq)
class AlreadyInstalledCandidate(Candidate):
is_installed = True
source_link = None
def __init__(
self,
dist, # type: Distribution
template, # type: InstallRequirement
factory, # type: Factory
):
# type: (...) -> None
self.dist = dist
self._ireq = make_install_req_from_dist(dist, template)
self._factory = factory
# This is just logging some messages, so we can do it eagerly.
# The returned dist would be exactly the same as self.dist because we
# set satisfied_by in make_install_req_from_dist.
# TODO: Supply reason based on force_reinstall and upgrade_strategy.
skip_reason = "already satisfied"
factory.preparer.prepare_installed_requirement(self._ireq, skip_reason)
def __str__(self):
# type: () -> str
return str(self.dist)
def __repr__(self):
# type: () -> str
return "{class_name}({distribution!r})".format(
class_name=self.__class__.__name__,
distribution=self.dist,
)
def __hash__(self):
# type: () -> int
return hash((self.__class__, self.name, self.version))
def __eq__(self, other):
# type: (Any) -> bool
if isinstance(other, self.__class__):
return self.name == other.name and self.version == other.version
return False
@property
def project_name(self):
# type: () -> NormalizedName
return canonicalize_name(self.dist.project_name)
@property
def name(self):
# type: () -> str
return self.project_name
@property
def version(self):
# type: () -> CandidateVersion
return parse_version(self.dist.version)
@property
def is_editable(self):
# type: () -> bool
return dist_is_editable(self.dist)
def format_for_error(self):
# type: () -> str
return f"{self.name} {self.version} (Installed)"
def iter_dependencies(self, with_requires):
# type: (bool) -> Iterable[Optional[Requirement]]
if not with_requires:
return
for r in self.dist.requires():
yield self._factory.make_requirement_from_spec(str(r), self._ireq)
def get_install_requirement(self):
# type: () -> Optional[InstallRequirement]
return None
class ExtrasCandidate(Candidate):
"""A candidate that has 'extras', indicating additional dependencies.
Requirements can be for a project with dependencies, something like
foo[extra]. The extras don't affect the project/version being installed
directly, but indicate that we need additional dependencies. We model that
by having an artificial ExtrasCandidate that wraps the "base" candidate.
The ExtrasCandidate differs from the base in the following ways:
1. It has a unique name, of the form foo[extra]. This causes the resolver
to treat it as a separate node in the dependency graph.
2. When we're getting the candidate's dependencies,
a) We specify that we want the extra dependencies as well.
b) We add a dependency on the base candidate.
See below for why this is needed.
3. We return None for the underlying InstallRequirement, as the base
candidate will provide it, and we don't want to end up with duplicates.
The dependency on the base candidate is needed so that the resolver can't
decide that it should recommend foo[extra1] version 1.0 and foo[extra2]
version 2.0. Having those candidates depend on foo=1.0 and foo=2.0
respectively forces the resolver to recognise that this is a conflict.
"""
def __init__(
self,
base, # type: BaseCandidate
extras, # type: FrozenSet[str]
):
# type: (...) -> None
self.base = base
self.extras = extras
def __str__(self):
# type: () -> str
name, rest = str(self.base).split(" ", 1)
return "{}[{}] {}".format(name, ",".join(self.extras), rest)
def __repr__(self):
# type: () -> str
return "{class_name}(base={base!r}, extras={extras!r})".format(
class_name=self.__class__.__name__,
base=self.base,
extras=self.extras,
)
def __hash__(self):
# type: () -> int
return hash((self.base, self.extras))
def __eq__(self, other):
# type: (Any) -> bool
if isinstance(other, self.__class__):
return self.base == other.base and self.extras == other.extras
return False
@property
def project_name(self):
# type: () -> NormalizedName
return self.base.project_name
@property
def name(self):
# type: () -> str
"""The normalised name of the project the candidate refers to"""
return format_name(self.base.project_name, self.extras)
@property
def version(self):
# type: () -> CandidateVersion
return self.base.version
def format_for_error(self):
# type: () -> str
return "{} [{}]".format(
self.base.format_for_error(), ", ".join(sorted(self.extras))
)
@property
def is_installed(self):
# type: () -> bool
return self.base.is_installed
@property
def is_editable(self):
# type: () -> bool
return self.base.is_editable
@property
def source_link(self):
# type: () -> Optional[Link]
return self.base.source_link
def iter_dependencies(self, with_requires):
# type: (bool) -> Iterable[Optional[Requirement]]
factory = self.base._factory
# Add a dependency on the exact base
# (See note 2b in the class docstring)
yield factory.make_requirement_from_candidate(self.base)
if not with_requires:
return
# The user may have specified extras that the candidate doesn't
# support. We ignore any unsupported extras here.
valid_extras = self.extras.intersection(self.base.dist.extras)
invalid_extras = self.extras.difference(self.base.dist.extras)
for extra in sorted(invalid_extras):
logger.warning(
"%s %s does not provide the extra '%s'",
self.base.name,
self.version,
extra,
)
for r in self.base.dist.requires(valid_extras):
requirement = factory.make_requirement_from_spec(
str(r), self.base._ireq, valid_extras
)
if requirement:
yield requirement
def get_install_requirement(self):
# type: () -> Optional[InstallRequirement]
# We don't return anything here, because we always
# depend on the base candidate, and we'll get the
# install requirement from that.
return None
class RequiresPythonCandidate(Candidate):
is_installed = False
source_link = None
def __init__(self, py_version_info):
# type: (Optional[Tuple[int, ...]]) -> None
if py_version_info is not None:
version_info = normalize_version_info(py_version_info)
else:
version_info = sys.version_info[:3]
self._version = Version(".".join(str(c) for c in version_info))
# We don't need to implement __eq__() and __ne__() since there is always
# only one RequiresPythonCandidate in a resolution, i.e. the host Python.
# The built-in object.__eq__() and object.__ne__() do exactly what we want.
def __str__(self):
# type: () -> str
return f"Python {self._version}"
@property
def project_name(self):
# type: () -> NormalizedName
# Avoid conflicting with the PyPI package "Python".
return cast(NormalizedName, "<Python from Requires-Python>")
@property
def name(self):
# type: () -> str
return self.project_name
@property
def version(self):
# type: () -> CandidateVersion
return self._version
def format_for_error(self):
# type: () -> str
return f"Python {self.version}"
def iter_dependencies(self, with_requires):
# type: (bool) -> Iterable[Optional[Requirement]]
return ()
def get_install_requirement(self):
# type: () -> Optional[InstallRequirement]
return None