feature: add new "lazy-wheel" config option

docs/configuration.md

@@ -271,6 +271,23 @@ across all your projects if incorrectly set.
 
 Use parallel execution when using the new (`>=1.1.0`) installer.
 
+### `solver.lazy-wheel`
+
+**Type**: `boolean`
+
+**Default**: `true`
+
+**Environment Variable**: `POETRY_SOLVER_LAZY_WHEEL`
+
+*Introduced in 1.8.0*
+
+Do not download entire wheels to extract metadata but use
+[HTTP range requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests)
+to only download the METADATA files of wheels.
+Especially with slow network connections this setting can speed up dependency resolution significantly.
+If the cache has already been filled or the server does not support HTTP range requests,
+this setting makes no difference.
+
 ### `virtualenvs.create`
 
 **Type**: `boolean`

src/poetry/config/config.py

@@ -131,6 +131,9 @@ class Config:
  "max-workers": None,
  "no-binary": None,
  },
+ "solver": {
+ "lazy-wheel": True,
+ },
  "warnings": {
  "export": True,
  },
@@ -296,6 +299,7 @@ def _get_normalizer(name: str) -> Callable[[str], Any]:
  "experimental.system-git-client",
  "installer.modern-installation",
  "installer.parallel",
+ "solver.lazy-wheel",
  "warnings.export",
  }:
  return boolean_normalizer

src/poetry/console/commands/config.py

@@ -68,15 +68,16 @@ def unique_config_values(self) -> dict[str, tuple[Any, Any]]:
  ),
  "virtualenvs.path": (str, lambda val: str(Path(val))),
  "virtualenvs.prefer-active-python": (boolean_validator, boolean_normalizer),
+ "virtualenvs.prompt": (str, str),
  "experimental.system-git-client": (boolean_validator, boolean_normalizer),
  "installer.modern-installation": (boolean_validator, boolean_normalizer),
  "installer.parallel": (boolean_validator, boolean_normalizer),
  "installer.max-workers": (lambda val: int(val) > 0, int_normalizer),
- "virtualenvs.prompt": (str, lambda val: str(val)),
  "installer.no-binary": (
  PackageFilterPolicy.validator,
  PackageFilterPolicy.normalize,
  ),
+ "solver.lazy-wheel": (boolean_validator, boolean_normalizer),
  "warnings.export": (boolean_validator, boolean_normalizer),
  }
 

src/poetry/inspection/info.py

@@ -30,6 +30,7 @@
 if TYPE_CHECKING:
  from collections.abc import Iterator
 
+ from packaging.metadata import RawMetadata
  from poetry.core.packages.project_package import ProjectPackage
 
 
@@ -392,7 +393,22 @@ def _find_dist_info(path: Path) -> Iterator[Path]:
  yield Path(d)
 
  @classmethod
- def from_metadata(cls, path: Path) -> PackageInfo | None:
+ def from_metadata(cls, metadata: RawMetadata) -> PackageInfo:
+ """
+ Create package information from core metadata.
+
+ :param metadata: raw metadata
+ """
+ return cls(
+ name=metadata.get("name"),
+ version=metadata.get("version"),
+ summary=metadata.get("summary"),
+ requires_dist=metadata.get("requires_dist"),
+ requires_python=metadata.get("requires_python"),
+ )
+
+ @classmethod
+ def from_metadata_directory(cls, path: Path) -> PackageInfo | None:
  """
  Helper method to parse package information from an unpacked metadata directory.
 
@@ -474,7 +490,7 @@ def from_directory(cls, path: Path, disable_build: bool = False) -> PackageInfo:
  if project_package:
  info = cls.from_package(project_package)
  else:
- info = cls.from_metadata(path)
+ info = cls.from_metadata_directory(path)
 
  if not info or info.requires_dist is None:
  try:
@@ -583,7 +599,7 @@ def get_pep517_metadata(path: Path) -> PackageInfo:
  *PEP517_META_BUILD_DEPS,
  )
  venv.run_python_script(pep517_meta_build_script)
- info = PackageInfo.from_metadata(dest_dir)
+ info = PackageInfo.from_metadata_directory(dest_dir)
  except EnvCommandError as e:
  # something went wrong while attempting pep517 metadata build
  # fallback to egg_info if setup.py available
@@ -600,7 +616,7 @@ def get_pep517_metadata(path: Path) -> PackageInfo:
  os.chdir(path)
  try:
  venv.run("python", "setup.py", "egg_info")
- info = PackageInfo.from_metadata(path)
+ info = PackageInfo.from_metadata_directory(path)
  except EnvCommandError as fbe:
  raise PackageInfoError(
  path, e, "Fallback egg_info generation failed.", fbe