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# The following comment should be removed at some point in the future.
# mypy: strict-optional=False
from __future__ import absolute_import
import contextlib
import errno
import hashlib
import logging
import os
from pip._internal.utils.temp_dir import TempDirectory
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
if MYPY_CHECK_RUNNING:
from types import TracebackType
from typing import Iterator, Optional, Set, Type
from pip._internal.req.req_install import InstallRequirement
from pip._internal.models.link import Link
logger = logging.getLogger(__name__)
class RequirementTracker(object):
def __init__(self):
# type: () -> None
self._root = os.environ.get('PIP_REQ_TRACKER')
if self._root is None:
self._temp_dir = TempDirectory(delete=False, kind='req-tracker')
self._root = os.environ['PIP_REQ_TRACKER'] = self._temp_dir.path
logger.debug('Created requirements tracker %r', self._root)
else:
self._temp_dir = None
logger.debug('Re-using requirements tracker %r', self._root)
self._entries = set() # type: Set[InstallRequirement]
def __enter__(self):
# type: () -> RequirementTracker
return self
def __exit__(
self,
exc_type, # type: Optional[Type[BaseException]]
exc_val, # type: Optional[BaseException]
exc_tb # type: Optional[TracebackType]
):
# type: (...) -> None
self.cleanup()
def _entry_path(self, link):
# type: (Link) -> str
hashed = hashlib.sha224(link.url_without_fragment.encode()).hexdigest()
return os.path.join(self._root, hashed)
def add(self, req):
# type: (InstallRequirement) -> None
link = req.link
info = str(req)
entry_path = self._entry_path(link)
try:
with open(entry_path) as fp:
# Error, these's already a build in progress.
raise LookupError('%s is already being built: %s'
% (link, fp.read()))
except IOError as e:
if e.errno != errno.ENOENT:
raise
assert req not in self._entries
with open(entry_path, 'w') as fp:
fp.write(info)
self._entries.add(req)
logger.debug('Added %s to build tracker %r', req, self._root)
def remove(self, req):
# type: (InstallRequirement) -> None
link = req.link
self._entries.remove(req)
os.unlink(self._entry_path(link))
logger.debug('Removed %s from build tracker %r', req, self._root)
def cleanup(self):
# type: () -> None
for req in set(self._entries):
self.remove(req)
remove = self._temp_dir is not None
if remove:
self._temp_dir.cleanup()
logger.debug('%s build tracker %r',
'Removed' if remove else 'Cleaned',
self._root)
@contextlib.contextmanager
def track(self, req):
# type: (InstallRequirement) -> Iterator[None]
self.add(req)
yield
self.remove(req)