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parallel.py
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/
parallel.py
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import os
from copy import deepcopy
from time import sleep
from concurrent.futures import ThreadPoolExecutor
from typing import Any, Callable, Optional, Union, Generator, List, Type
from zipfile import ZipFile, ZIP_DEFLATED
from six.moves.queue import PriorityQueue, Queue, Empty
from pathlib2 import Path
from tempfile import mkstemp
from collections import deque
from threading import Thread
from ..debugging.log import LoggerRoot
from ..storage.util import format_size
class _DeferredClass(object):
__slots__ = ('__queue', '__future_caller', '__future_func')
def __init__(self, a_future_caller, future_func):
self.__queue = Queue()
self.__future_caller = a_future_caller
self.__future_func = future_func
def __nested_caller(self, item, args, kwargs):
# wait until object is constructed
getattr(self.__future_caller, "id") # noqa
future_func = getattr(self.__future_caller, self.__future_func)
the_object = future_func()
the_object_func = getattr(the_object, item)
return the_object_func(*args, **kwargs)
def _flush_into_logger(self, a_future_object=None, a_future_func=None):
self.__close_queue(a_future_object=a_future_object, a_future_func=a_future_func)
def __close_queue(self, a_future_object=None, a_future_func=None):
# call this function when we Know the object is initialization is completed
if self.__queue is None:
return
_queue = self.__queue
self.__queue = None
while True:
# noinspection PyBroadException
try:
item, args, kwargs = _queue.get(block=False)
if a_future_object:
future_func = getattr(a_future_object, self.__future_func)
the_object = future_func()
the_object_func = getattr(the_object, item)
the_object_func(*args, **kwargs)
elif a_future_func:
the_object_func = getattr(a_future_func, item)
the_object_func(*args, **kwargs)
else:
self.__nested_caller(item, args, kwargs)
except Empty:
break
except Exception:
# import traceback
# stdout_print(''.join(traceback.format_exc()))
pass
def __getattr__(self, item):
def _caller(*args, **kwargs):
# if we already completed the background initialization, call functions immediately
# noinspection PyProtectedMember
if not self.__queue or self.__future_caller._FutureTaskCaller__executor is None:
return self.__nested_caller(item, args, kwargs)
# noinspection PyBroadException
try:
# if pool is still active call async
self.__queue.put((item, deepcopy(args) if args else args, deepcopy(kwargs) if kwargs else kwargs))
except Exception:
# assume we wait only if self.__pool was nulled between the if and now, so just call directly
return self.__nested_caller(item, args, kwargs)
# let's hope it is the right one
return True
return _caller
class FutureTaskCaller(object):
"""
FutureTaskCaller is used to create a class via a functions async, in another thread.
For example:
.. code-block:: py
future = FutureTaskCaller().call(func=max, func_cb=None, override_cls=None, 1, 2)
print('Running other code')
print(future.result()) # will print '2'
"""
__slots__ = ('__object', '__object_cls', '__executor', '__deferred_bkg_class')
@property
def __class__(self):
return self.__object_cls
def __init__(self, func, func_cb, override_cls, *args, **kwargs):
# type: (Callable, Optional[Callable], Type, *Any, **Any) -> None
"""
__init__(*args, **kwargs) in another thread
:return: This FutureTaskCaller instance
"""
self.__object = None
self.__object_cls = override_cls
self.__deferred_bkg_class = _DeferredClass(self, "get_logger")
self.__executor = Thread(target=self.__submit__, args=(func, func_cb, args, kwargs))
self.__executor.daemon = True
self.__executor.start()
def __submit__(self, fn, fn_cb, args, kwargs):
# background initialization call
_object = fn(*args, **kwargs)
# push all background calls (now that the initialization is complete)
if self.__deferred_bkg_class:
_deferred_bkg_class = self.__deferred_bkg_class
self.__deferred_bkg_class = None
# noinspection PyProtectedMember
_deferred_bkg_class._flush_into_logger(a_future_object=_object)
# store the initialized object
self.__object = _object
# callback function
if fn_cb is not None:
fn_cb(self.__object)
def __getattr__(self, item):
# if we get here, by definition this is not a __slot__ entry, pass to the object
return getattr(self.__result__(), item)
def __setattr__(self, item, value):
# make sure we can set the slots
if item in ["_FutureTaskCaller__executor", "_FutureTaskCaller__object",
"_FutureTaskCaller__object_cls", "_FutureTaskCaller__deferred_bkg_class"]:
return super(FutureTaskCaller, self).__setattr__(item, value)
setattr(self.__result__(), item, value)
def __result__(self, timeout=None):
# type: (Optional[float]) -> Any
"""
Wait and get the result of the function called with self.call()
:param timeout: The maximum number of seconds to wait for the result. If None,
there is no limit for the wait time.
:return: The result of the called function
"""
if self.__executor:
# since the test is not atomic, we assume that if we failed joining
# it is because someone else joined before us
# noinspection PyBroadException
try:
self.__executor.join(timeout=timeout)
except RuntimeError:
# this is probably calling ourselves from the same thread
raise
except Exception:
# wait until that someone else updated the __object
while self.__object is None:
sleep(1)
self.__executor = None
return self.__object
# This is the part where we are no longer generic, but __slots__
# inheritance is too cumbersome to actually inherit and make sure it works optimally
def get_logger(self):
if self.__object is not None:
return self.__object.get_logger()
if self.__deferred_bkg_class is None:
# we are shutting down, wait until object is available
return self.__result__().get_logger()
return self.__deferred_bkg_class
class ParallelZipper(object):
"""
Used to zip multiple files in zip chunks of a particular size, all in parallel
"""
class ZipperObject(object):
def __init__(
self,
chunk_size, # int
zipper_queue, # PriorityQueue[ParallelZipper.ZipperObject]
zipper_results, # Queue[ParallelZipper.ZipperObject]
allow_zip_64, # bool
compression, # Any
zip_prefix, # str
zip_suffix, # str
verbose, # bool
task, # Any
):
# (...) -> ParallelZipper.ZipperObject
"""
Initialize a ParallelZipper.ZipperObject instance that holds its corresponding zip
file, as well as other relevant data
:param chunk_size: Chunk size, in MB. The ParallelZipper will try its best not to exceed this size
when bulding up this zipper object, but that is not guaranteed
:param zipper_queue: PriorityQueue that holds ParallelZipper.ZipperObject instances.
When this ParallelZipper.ZipperObject can hold more data (i.e. chunk_size was not exceeded),
this object will reinsert itself in this queue to be reused by the ParallelZipper.
Else, a fresh ParallelZipper.ZipperObject will be inserted
:param zipper_results: Queue that holds ParallelZipper.ZipperObject instances. These instances
are added to this queue when chunk_size is exceeded
:param allow_zip_64: if True ZipFile will create files with ZIP64 extensions when
needed, otherwise it will raise an exception when this would be necessary
:param compression: ZipFile.ZIP_STORED (no compression), ZipFile.ZIP_DEFLATED (requires zlib),
ZipFile.ZIP_BZIP2 (requires bz2) or ZipFile.ZIP_LZMA (requires lzma).
:param zip_prefix: The zip file created by this object will have its name prefixed by this
:param zip_suffix: The zip file created by this object will have its name suffixed by this
:param verbose: If True, print data relevant to the file compression
:param task: ClearML Task, used for logging
:return: ParallelZipper.ZipperObject instance
"""
self._chunk_size = chunk_size
self._zipper_queue = zipper_queue
self._zipper_results = zipper_results
self._allow_zip_64 = allow_zip_64
self._compression = compression
self._zip_prefix = zip_prefix
self._zip_suffix = zip_suffix
self._verbose = verbose
self._task = task
self.fd, self.zip_path = mkstemp(prefix=zip_prefix, suffix=zip_suffix)
self.zip_path = Path(self.zip_path)
self.zip_file = ZipFile(self.zip_path.as_posix(), "w", allowZip64=allow_zip_64, compression=compression)
self.archive_preview = []
self.count = 0
self.files_zipped = set()
def zip(self, file_path, arcname=None):
# type: (Union[str, Path], str) -> ()
"""
Zips a file into the ZipFile created by this instance. This instance will either add
itself back to the PriorityQueue used to select the best zipping candidate or add itself
to the result Queue after exceeding self.chunk_size.
:param file_path: Path to the file to be zipped
:param arcname: Name of the file in the archive
"""
if self._verbose and self._task:
self._task.get_logger().report_text("Compressing {}".format(Path(file_path).as_posix()))
self.zip_file.write(file_path, arcname=arcname)
self.count += 1
preview_path = arcname
if not preview_path:
preview_path = file_path
self.archive_preview.append("{} - {}".format(preview_path, format_size(self.size)))
self.files_zipped.add(Path(file_path).as_posix())
if self._chunk_size <= 0 or self.size < self._chunk_size:
self._zipper_queue.put(self)
else:
self._zipper_queue.put(
ParallelZipper.ZipperObject(
self._chunk_size,
self._zipper_queue,
self._zipper_results,
self._allow_zip_64,
self._compression,
self._zip_prefix,
self._zip_suffix,
self._verbose,
self._task,
)
)
self._zipper_results.put(self)
def merge(self, other):
# type: (ParallelZipper.ZipperObject) -> ()
"""
Merges one ParallelZipper.ZipperObject instance into the current one.
All the files zipped by the other instance will be added to this instance,
as well as any other useful additional data
:param other: ParallelZipper.ZipperObject instance to merge into this one
"""
with ZipFile(self.zip_path.as_posix(), "a") as parent_zip:
with ZipFile(other.zip_path.as_posix(), "r") as child_zip:
for child_name in child_zip.namelist():
parent_zip.writestr(child_name, child_zip.open(child_name).read())
self.files_zipped |= other.files_zipped
self.count += other.count
self.archive_preview.extend(other.archive_preview)
def close(self):
# type: () -> ()
"""
Attempts to close file descriptors associated to the ZipFile
"""
# noinspection PyBroadException
try:
self.zip_file.close()
os.close(self.fd)
except Exception:
pass
def delete(self):
# type: () -> ()
"""
Attempts to delete the ZipFile from the disk
"""
# noinspection PyBroadException
try:
self.close()
self.zip_path.unlink()
except Exception:
pass
@property
def size(self):
# type: () -> ()
"""
:return: Size of the ZipFile, in bytes
"""
return self.zip_path.stat().st_size
def __lt__(self, other):
# we want to completely "fill" as many zip files as possible, hence the ">" comparison
return self.size > other.size
def __init__(
self,
chunk_size, # type: int
max_workers, # type: int
allow_zip_64=True, # type: Optional[bool]
compression=ZIP_DEFLATED, # type: Optional[Any]
zip_prefix="", # type: Optional[str]
zip_suffix="", # type: Optional[str]
verbose=False, # type: Optional[bool]
task=None, # type: Optional[Any]
pool=None, # type: Optional[ThreadPoolExecutor]
):
# type: (...) -> ParallelZipper
"""
Initialize the ParallelZipper. Each zip created by this object will have the following naming
format: [zip_prefix]<random_string>[zip_suffix]
:param chunk_size: Chunk size, in MB. The ParallelZipper will try its best not to exceed this size,
but that is not guaranteed
:param max_workers: The maximum number of workers spawned when zipping the files
:param allow_zip_64: if True ZipFile will create files with ZIP64 extensions when
needed, otherwise it will raise an exception when this would be necessary
:param compression: ZipFile.ZIP_STORED (no compression), ZipFile.ZIP_DEFLATED (requires zlib),
ZipFile.ZIP_BZIP2 (requires bz2) or ZipFile.ZIP_LZMA (requires lzma).
:param zip_prefix: Zip file names will be prefixed by this
:param zip_suffix: Zip file names will pe suffixed by this
:param verbose: If True, print data relevant to the file compression
:param task: ClearML Task, used for logging
:param pool: Use this ThreadPoolExecutor instead of creating one. Note that this pool will not be
closed after zipping is finished.
:return: ParallelZipper instance
"""
self._chunk_size = chunk_size * (1024 ** 2)
self._max_workers = max_workers
self._allow_zip_64 = allow_zip_64
self._compression = compression
self._zip_prefix = zip_prefix
self._zip_suffix = zip_suffix
self._verbose = verbose
self._task = task
self._pool = pool
self._zipper_queue = PriorityQueue()
self._zipper_results = Queue()
def zip_iter(
self,
file_paths, # type: List[Union[str, Path]]
arcnames=None # type: Optional[dict[Union[str, Path], str]]
):
# type: (...) -> Generator[ParallelZipper.ZipperObject]
"""
Generator function that returns zip files as soon as they are available.
The zipping is done in parallel
:param file_paths: List of paths to the files to zip
:param arcnames: Dictionary that maps the file path to what should be its name in the archive.
:return: Generator of ParallelZipper.ZipperObjects
"""
if arcnames is None:
arcnames = dict()
while not self._zipper_queue.empty():
self._zipper_queue.get_nowait()
for _ in range(self._max_workers):
self._zipper_queue.put(
ParallelZipper.ZipperObject(
self._chunk_size,
self._zipper_queue,
self._zipper_results,
self._allow_zip_64,
self._compression,
self._zip_prefix,
self._zip_suffix,
self._verbose,
self._task,
)
)
filtered_file_paths = []
for file_path in file_paths:
if not Path(file_path).is_file():
LoggerRoot.get_base_logger().warning("Could not store dataset file {}. File skipped".format(file_path))
else:
filtered_file_paths.append(file_path)
file_paths = filtered_file_paths
file_paths = sorted(file_paths, key=lambda k: Path(k).stat().st_size, reverse=True)
# zip in parallel
pooled = []
if not self._pool:
pool = ThreadPoolExecutor(max_workers=self._max_workers)
else:
pool = self._pool
for f in file_paths:
zipper = self._zipper_queue.get()
pooled.append(pool.submit(zipper.zip, Path(f).as_posix(), arcname=arcnames.get(f)))
for result in self._yield_zipper_results():
yield result
for task in pooled:
task.result()
if not self._pool:
pool.shutdown()
for result in self._yield_zipper_results():
yield result
zipper_results_leftover = []
# extract remaining results
while not self._zipper_queue.empty():
result = self._zipper_queue.get()
if result.count != 0:
zipper_results_leftover.append(result)
else:
result.delete()
zipper_results_leftover = deque(sorted(zipper_results_leftover, reverse=True))
# merge zip files greedily if possible and get the paths as results
while len(zipper_results_leftover) > 0:
zip_ = zipper_results_leftover.pop()
zip_.close()
if zip_.size >= self._chunk_size > 0:
yield zip_
continue
while len(zipper_results_leftover) > 0 and (
self._chunk_size <= 0 or zipper_results_leftover[0].size + zip_.size < self._chunk_size
):
child_zip = zipper_results_leftover.popleft()
child_zip.close()
zip_.merge(child_zip)
child_zip.delete()
yield zip_
def _yield_zipper_results(self):
while True:
try:
result = self._zipper_results.get_nowait()
result.close()
yield result
except Empty:
break