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python_requirements.py
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python_requirements.py
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# Copyright 2022 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).
from __future__ import annotations
import itertools
from typing import Iterable
from packaging.utils import canonicalize_name as canonicalize_project_name
from pants.backend.python.macros.common_fields import (
ModuleMappingField,
RequirementsOverrideField,
TypeStubsModuleMappingField,
)
from pants.backend.python.pip_requirement import PipRequirement
from pants.backend.python.subsystems.setup import PythonSetup
from pants.backend.python.target_types import (
PythonRequirementModulesField,
PythonRequirementResolveField,
PythonRequirementsField,
PythonRequirementsFileSourcesField,
PythonRequirementsFileTarget,
PythonRequirementTarget,
PythonRequirementTypeStubModulesField,
parse_requirements_file,
)
from pants.engine.addresses import Address
from pants.engine.fs import DigestContents, GlobMatchErrorBehavior, PathGlobs
from pants.engine.rules import Get, collect_rules, rule
from pants.engine.target import (
COMMON_TARGET_FIELDS,
Dependencies,
GeneratedTargets,
GenerateTargetsRequest,
InvalidFieldException,
SingleSourceField,
Target,
)
from pants.engine.unions import UnionRule
from pants.util.logging import LogLevel
class PythonRequirementsSourceField(SingleSourceField):
default = "requirements.txt"
required = False
class PythonRequirementsTargetGenerator(Target):
alias = "python_requirements"
help = (
"Generate a `python_requirement` for each entry in a requirements.txt-style file.\n\n"
"This works with pip-style requirements files: "
"https://pip.pypa.io/en/latest/reference/requirements-file-format/. However, pip options "
"like `--hash` are (for now) ignored.\n\n"
"Instead of pip-style VCS requirements, use direct references from PEP 440: "
"https://www.python.org/dev/peps/pep-0440/#direct-references."
)
# Note that this does not have a `dependencies` field.
core_fields = (
*COMMON_TARGET_FIELDS,
ModuleMappingField,
TypeStubsModuleMappingField,
PythonRequirementsSourceField,
RequirementsOverrideField,
PythonRequirementResolveField,
)
class GenerateFromPythonRequirementsRequest(GenerateTargetsRequest):
generate_from = PythonRequirementsTargetGenerator
@rule(desc="Generate `python_requirement` targets from requirements.txt", level=LogLevel.DEBUG)
async def generate_from_python_requirement(
request: GenerateFromPythonRequirementsRequest, python_setup: PythonSetup
) -> GeneratedTargets:
generator = request.generator
requirements_rel_path = generator[PythonRequirementsSourceField].value
requirements_full_path = generator[PythonRequirementsSourceField].file_path
file_tgt = PythonRequirementsFileTarget(
{PythonRequirementsFileSourcesField.alias: requirements_rel_path},
Address(
generator.address.spec_path,
target_name=generator.address.target_name,
relative_file_path=requirements_rel_path,
),
)
digest_contents = await Get(
DigestContents,
PathGlobs(
[requirements_full_path],
glob_match_error_behavior=GlobMatchErrorBehavior.error,
description_of_origin=f"{generator}'s field `{PythonRequirementsSourceField.alias}`",
),
)
requirements = parse_requirements_file(
digest_contents[0].content.decode(), rel_path=requirements_full_path
)
grouped_requirements = itertools.groupby(
requirements, lambda parsed_req: parsed_req.project_name
)
# Validate the resolve is legal.
generator[PythonRequirementResolveField].normalized_value(python_setup)
module_mapping = generator[ModuleMappingField].value
stubs_mapping = generator[TypeStubsModuleMappingField].value
overrides = generator[RequirementsOverrideField].flatten_and_normalize()
inherited_fields = {
field.alias: field.value
for field in request.generator.field_values.values()
if isinstance(field, (*COMMON_TARGET_FIELDS, PythonRequirementResolveField))
}
def generate_tgt(
project_name: str, parsed_reqs: Iterable[PipRequirement]
) -> PythonRequirementTarget:
normalized_proj_name = canonicalize_project_name(project_name)
tgt_overrides = overrides.pop(normalized_proj_name, {})
if Dependencies.alias in tgt_overrides:
tgt_overrides[Dependencies.alias] = list(tgt_overrides[Dependencies.alias]) + [
file_tgt.address.spec
]
return PythonRequirementTarget(
{
**inherited_fields,
PythonRequirementsField.alias: list(parsed_reqs),
PythonRequirementModulesField.alias: module_mapping.get(normalized_proj_name),
PythonRequirementTypeStubModulesField.alias: stubs_mapping.get(
normalized_proj_name
),
# This may get overridden by `tgt_overrides`, which will have already added in
# the file tgt.
Dependencies.alias: [file_tgt.address.spec],
**tgt_overrides,
},
generator.address.create_generated(project_name),
)
result = tuple(
generate_tgt(project_name, parsed_reqs_)
for project_name, parsed_reqs_ in grouped_requirements
) + (file_tgt,)
if overrides:
raise InvalidFieldException(
f"Unused key in the `overrides` field for {request.generator.address}: "
f"{sorted(overrides)}"
)
return GeneratedTargets(generator, result)
def rules():
return (
*collect_rules(),
UnionRule(GenerateTargetsRequest, GenerateFromPythonRequirementsRequest),
)