import time
import threading
+from collections import deque
+from stat import *
+
from keep import *
from stream import *
import config
stream_tokens.append("{0}:{1}:{2}".format(current_span[0], current_span[1] - current_span[0], fout))
if len(stream[f]) == 0:
- stream_tokens.append("0:0:{0}".format(fout))
+ stream_tokens.append("0:0:{0}".format(fout))
- return stream_tokens
+ return stream_tokens
def normalize(collection):
streams = {}
self._current_file_name = None
self._current_file_pos = 0
self._finished_streams = []
+ self._close_file = None
+ self._queued_file = None
+ self._queued_dirents = deque()
+ self._queued_trees = deque()
def __enter__(self):
pass
def __exit__(self):
self.finish()
- def write_directory_tree(self,
- path, stream_name='.', max_manifest_depth=-1):
- self.start_new_stream(stream_name)
- todo = []
- if max_manifest_depth == 0:
- dirents = sorted(util.listdir_recursive(path))
- else:
- dirents = sorted(os.listdir(path))
- for dirent in dirents:
+ def do_queued_work(self):
+ # The work queue consists of three pieces:
+ # * _queued_file: The file object we're currently writing to the
+ # Collection.
+ # * _queued_dirents: Entries under the current directory
+ # (_queued_trees[0]) that we want to write or recurse through.
+ # This may contain files from subdirectories if
+ # max_manifest_depth == 0 for this directory.
+ # * _queued_trees: Directories that should be written as separate
+ # streams to the Collection.
+ # This function handles the smallest piece of work currently queued
+ # (current file, then current directory, then next directory) until
+ # no work remains. The _work_THING methods each do a unit of work on
+ # THING. _queue_THING methods add a THING to the work queue.
+ while True:
+ if self._queued_file:
+ self._work_file()
+ elif self._queued_dirents:
+ self._work_dirents()
+ elif self._queued_trees:
+ self._work_trees()
+ else:
+ break
+
+ def _work_file(self):
+ while True:
+ buf = self._queued_file.read(self.KEEP_BLOCK_SIZE)
+ if not buf:
+ break
+ self.write(buf)
+ self.finish_current_file()
+ if self._close_file:
+ self._queued_file.close()
+ self._close_file = None
+ self._queued_file = None
+
+ def _work_dirents(self):
+ path, stream_name, max_manifest_depth = self._queued_trees[0]
+ if stream_name != self.current_stream_name():
+ self.start_new_stream(stream_name)
+ while self._queued_dirents:
+ dirent = self._queued_dirents.popleft()
target = os.path.join(path, dirent)
if os.path.isdir(target):
- todo += [[target,
- os.path.join(stream_name, dirent),
- max_manifest_depth-1]]
+ self._queue_tree(target,
+ os.path.join(stream_name, dirent),
+ max_manifest_depth - 1)
else:
- self.start_new_file(dirent)
- with open(target, 'rb') as f:
- while True:
- buf = f.read(2**26)
- if len(buf) == 0:
- break
- self.write(buf)
- self.finish_current_stream()
- map(lambda x: self.write_directory_tree(*x), todo)
+ self._queue_file(target, dirent)
+ break
+ if not self._queued_dirents:
+ self._queued_trees.popleft()
+
+ def _work_trees(self):
+ path, stream_name, max_manifest_depth = self._queued_trees[0]
+ make_dirents = (util.listdir_recursive if (max_manifest_depth == 0)
+ else os.listdir)
+ self._queue_dirents(stream_name, make_dirents(path))
+
+ def _queue_file(self, source, filename=None):
+ assert (self._queued_file is None), "tried to queue more than one file"
+ if not hasattr(source, 'read'):
+ source = open(source, 'rb')
+ self._close_file = True
+ else:
+ self._close_file = False
+ if filename is None:
+ filename = os.path.basename(source.name)
+ self.start_new_file(filename)
+ self._queued_file = source
+
+ def _queue_dirents(self, stream_name, dirents):
+ assert (not self._queued_dirents), "tried to queue more than one tree"
+ self._queued_dirents = deque(sorted(dirents))
+
+ def _queue_tree(self, path, stream_name, max_manifest_depth):
+ self._queued_trees.append((path, stream_name, max_manifest_depth))
+
+ def write_file(self, source, filename=None):
+ self._queue_file(source, filename)
+ self.do_queued_work()
+
+ def write_directory_tree(self,
+ path, stream_name='.', max_manifest_depth=-1):
+ self._queue_tree(path, stream_name, max_manifest_depth)
+ self.do_queued_work()
def write(self, newdata):
if hasattr(newdata, '__iter__'):
manifest += ' ' + ' '.join(stream[1])
manifest += ' ' + ' '.join("%d:%d:%s" % (sfile[0], sfile[1], sfile[2].replace(' ', '\\040')) for sfile in stream[2])
manifest += "\n"
-
+
#print 'writer',manifest
#print 'after reader',CollectionReader(manifest).manifest_text()
for name, locators, files in self._finished_streams:
ret += locators
return ret
+
+
+class ResumableCollectionWriter(CollectionWriter):
+ STATE_PROPS = ['_current_stream_files', '_current_stream_length',
+ '_current_stream_locators', '_current_stream_name',
+ '_current_file_name', '_current_file_pos', '_close_file',
+ '_data_buffer', '_dependencies', '_finished_streams',
+ '_queued_dirents', '_queued_trees']
+
+ def __init__(self):
+ self._dependencies = {}
+ super(ResumableCollectionWriter, self).__init__()
+
+ @classmethod
+ def from_state(cls, state, *init_args, **init_kwargs):
+ # Try to build a new writer from scratch with the given state.
+ # If the state is not suitable to resume (because files have changed,
+ # been deleted, aren't predictable, etc.), raise a
+ # StaleWriterStateError. Otherwise, return the initialized writer.
+ # The caller is responsible for calling writer.do_queued_work()
+ # appropriately after it's returned.
+ writer = cls(*init_args, **init_kwargs)
+ for attr_name in cls.STATE_PROPS:
+ attr_value = state[attr_name]
+ attr_class = getattr(writer, attr_name).__class__
+ # Coerce the value into the same type as the initial value, if
+ # needed.
+ if attr_class not in (type(None), attr_value.__class__):
+ attr_value = attr_class(attr_value)
+ setattr(writer, attr_name, attr_value)
+ # Check dependencies before we try to resume anything.
+ if any(KeepLocator(ls).permission_expired()
+ for ls in writer._current_stream_locators):
+ raise errors.StaleWriterStateError(
+ "locators include expired permission hint")
+ writer.check_dependencies()
+ if state['_current_file'] is not None:
+ path, pos = state['_current_file']
+ try:
+ writer._queued_file = open(path, 'rb')
+ writer._queued_file.seek(pos)
+ except IOError as error:
+ raise errors.StaleWriterStateError(
+ "failed to reopen active file {}: {}".format(path, error))
+ return writer
+
+ def check_dependencies(self):
+ for path, orig_stat in self._dependencies.items():
+ if not S_ISREG(orig_stat[ST_MODE]):
+ raise errors.StaleWriterStateError("{} not file".format(path))
+ try:
+ now_stat = tuple(os.stat(path))
+ except OSError as error:
+ raise errors.StaleWriterStateError(
+ "failed to stat {}: {}".format(path, error))
+ if ((not S_ISREG(now_stat[ST_MODE])) or
+ (orig_stat[ST_MTIME] != now_stat[ST_MTIME]) or
+ (orig_stat[ST_SIZE] != now_stat[ST_SIZE])):
+ raise errors.StaleWriterStateError("{} changed".format(path))
+
+ def dump_state(self, copy_func=lambda x: x):
+ state = {attr: copy_func(getattr(self, attr))
+ for attr in self.STATE_PROPS}
+ if self._queued_file is None:
+ state['_current_file'] = None
+ else:
+ state['_current_file'] = (os.path.realpath(self._queued_file.name),
+ self._queued_file.tell())
+ return state
+
+ def _queue_file(self, source, filename=None):
+ try:
+ src_path = os.path.realpath(source)
+ except Exception:
+ raise errors.AssertionError("{} not a file path".format(source))
+ try:
+ path_stat = os.stat(src_path)
+ except OSError as stat_error:
+ path_stat = None
+ super(ResumableCollectionWriter, self)._queue_file(source, filename)
+ fd_stat = os.fstat(self._queued_file.fileno())
+ if not S_ISREG(fd_stat.st_mode):
+ # We won't be able to resume from this cache anyway, so don't
+ # worry about further checks.
+ self._dependencies[source] = tuple(fd_stat)
+ elif path_stat is None:
+ raise errors.AssertionError(
+ "could not stat {}: {}".format(source, stat_error))
+ elif path_stat.st_ino != fd_stat.st_ino:
+ raise errors.AssertionError(
+ "{} changed between open and stat calls".format(source))
+ else:
+ self._dependencies[src_path] = tuple(fd_stat)
+
+ def write(self, data):
+ if self._queued_file is None:
+ raise errors.AssertionError(
+ "resumable writer can't accept unsourced data")
+ return super(ResumableCollectionWriter, self).write(data)
projects / arvados.git / blobdiff