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# Copyright 2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
from portage import os
from portage.checksum import perform_multiple_checksums
from portage.util._async.ForkProcess import ForkProcess
from _emerge.PipeReader import PipeReader
class FileDigester(ForkProcess):
"""
Asynchronously generate file digests. Pass in file_path and
hash_names, and after successful execution, the digests
attribute will be a dict containing all of the requested
digests.
"""
__slots__ = (
"file_path",
"digests",
"hash_names",
"_digest_pipe_reader",
"_digest_pw",
)
def _start(self):
pr, pw = os.pipe()
self.fd_pipes = {}
self.fd_pipes[pw] = pw
self._digest_pw = pw
self._digest_pipe_reader = PipeReader(
input_files={"input": pr}, scheduler=self.scheduler
)
self._digest_pipe_reader.addExitListener(self._digest_pipe_reader_exit)
self._digest_pipe_reader.start()
ForkProcess._start(self)
os.close(pw)
def _run(self):
digests = perform_multiple_checksums(self.file_path, hashes=self.hash_names)
buf = "".join("%s=%s\n" % item for item in digests.items()).encode("utf_8")
while buf:
buf = buf[os.write(self._digest_pw, buf) :]
return os.EX_OK
def _parse_digests(self, data):
digests = {}
for line in data.decode("utf_8").splitlines():
parts = line.split("=", 1)
if len(parts) == 2:
digests[parts[0]] = parts[1]
self.digests = digests
def _async_waitpid(self):
# Ignore this event, since we want to ensure that we
# exit only after _digest_pipe_reader has reached EOF.
if self._digest_pipe_reader is None:
ForkProcess._async_waitpid(self)
def _digest_pipe_reader_exit(self, pipe_reader):
self._parse_digests(pipe_reader.getvalue())
self._digest_pipe_reader = None
if self.pid is None:
self._unregister()
self._async_wait()
else:
self._async_waitpid()
def _unregister(self):
ForkProcess._unregister(self)
pipe_reader = self._digest_pipe_reader
if pipe_reader is not None:
self._digest_pipe_reader = None
pipe_reader.removeExitListener(self._digest_pipe_reader_exit)
pipe_reader.cancel()
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