/
source.py
64 lines (50 loc) · 1.67 KB
/
source.py
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import abc
from typing import Iterable, Set
from packaging.version import Version, InvalidVersion
import logging
class PackageInfo(metaclass=abc.ABCMeta):
@abc.abstractmethod
def get_name(self) -> str:
pass
@abc.abstractmethod
def get_urls(self) -> Iterable[str]:
pass
class Source(metaclass=abc.ABCMeta):
def __init__(self, package: PackageInfo):
self.package = package
self.name = None
self._data_versions = None
self._versions = None
# Find source-specific name:
for name in self._possible_names(self.package):
data = self._fetch_versions(name)
if data is not None:
self._data_versions = data
self.name = name
break
@classmethod
@abc.abstractmethod
def _fetch_versions(cls, name: str) -> Set[str]:
pass
@classmethod
def _possible_names(cls, package: PackageInfo) -> Iterable[str]:
"""
Return some iterable (list is preferred) of possible package names
"""
return {package.get_name()}
@property
def versions(self) -> Set[Version]:
if self._versions is not None:
return self._versions
if self._data_versions is None:
return None
versions = set()
for version_str in self._data_versions:
try:
version = Version(version_str)
except InvalidVersion:
logging.info("Got invalid version for {}: {}".format(self.package.get_name(), version_str))
continue
versions.add(version)
self._versions = versions
return self._versions