-import gflags
-import httplib
-import httplib2
+import functools
import logging
import os
-import pprint
-import sys
-import types
-import subprocess
-import json
-import UserDict
import re
+import errno
import hashlib
-import string
-import bz2
-import zlib
-import fcntl
import time
import threading
from collections import deque
from stat import *
-from keep import *
-from stream import *
+from .arvfile import split, _FileLikeObjectBase, ArvadosFile, ArvadosFileWriter, ArvadosFileReader, _BlockManager, synchronized, must_be_writable, NoopLock
+from keep import KeepLocator, KeepClient
+from .stream import StreamReader
+from ._normalize_stream import normalize_stream
+from ._ranges import Range, LocatorAndRange
+from .safeapi import ThreadSafeApiCache
import config
import errors
import util
+import events
+from arvados.retry import retry_method
_logger = logging.getLogger('arvados.collection')
-def normalize_stream(s, stream):
- stream_tokens = [s]
- sortedfiles = list(stream.keys())
- sortedfiles.sort()
-
- blocks = {}
- streamoffset = 0L
- for f in sortedfiles:
- for b in stream[f]:
- if b[arvados.LOCATOR] not in blocks:
- stream_tokens.append(b[arvados.LOCATOR])
- blocks[b[arvados.LOCATOR]] = streamoffset
- streamoffset += b[arvados.BLOCKSIZE]
-
- if len(stream_tokens) == 1:
- stream_tokens.append(config.EMPTY_BLOCK_LOCATOR)
-
- for f in sortedfiles:
- current_span = None
- fout = f.replace(' ', '\\040')
- for segment in stream[f]:
- segmentoffset = blocks[segment[arvados.LOCATOR]] + segment[arvados.OFFSET]
- if current_span == None:
- current_span = [segmentoffset, segmentoffset + segment[arvados.SEGMENTSIZE]]
- else:
- if segmentoffset == current_span[1]:
- current_span[1] += segment[arvados.SEGMENTSIZE]
- else:
- stream_tokens.append("{0}:{1}:{2}".format(current_span[0], current_span[1] - current_span[0], fout))
- current_span = [segmentoffset, segmentoffset + segment[arvados.SEGMENTSIZE]]
-
- if current_span != None:
- 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))
-
- return stream_tokens
-
-def normalize(collection):
- streams = {}
- for s in collection.all_streams():
- for f in s.all_files():
- filestream = s.name() + "/" + f.name()
- r = filestream.rindex("/")
- streamname = filestream[:r]
- filename = filestream[r+1:]
- if streamname not in streams:
- streams[streamname] = {}
- if filename not in streams[streamname]:
- streams[streamname][filename] = []
- for r in f.segments:
- streams[streamname][filename].extend(s.locators_and_ranges(r[0], r[1]))
-
- normalized_streams = []
- sortedstreams = list(streams.keys())
- sortedstreams.sort()
- for s in sortedstreams:
- normalized_streams.append(normalize_stream(s, streams[s]))
- return normalized_streams
-
-
-class CollectionReader(object):
- def __init__(self, manifest_locator_or_text, api_client=None):
- self._api_client = api_client
- self._keep_client = None
- if re.match(r'[a-f0-9]{32}(\+\d+)?(\+\S+)*$', manifest_locator_or_text):
- self._manifest_locator = manifest_locator_or_text
- self._manifest_text = None
- elif re.match(r'[a-z0-9]{5}-[a-z0-9]{5}-[a-z0-9]{15}$', manifest_locator_or_text):
- self._manifest_locator = manifest_locator_or_text
- self._manifest_text = None
- elif re.match(r'((\S+)( +[a-f0-9]{32}(\+\d+)(\+\S+)*)+( +\d+:\d+:\S+)+$)+', manifest_locator_or_text, re.MULTILINE):
- self._manifest_text = manifest_locator_or_text
- self._manifest_locator = None
- else:
- raise errors.ArgumentError(
- "Argument to CollectionReader must be a manifest or a collection UUID")
- self._streams = None
-
+class CollectionBase(object):
def __enter__(self):
- pass
+ return self
- def __exit__(self):
+ def __exit__(self, exc_type, exc_value, traceback):
pass
- def _populate(self):
- if self._streams is not None:
- return
- if not self._manifest_text:
- try:
- # As in KeepClient itself, we must wait until the last possible
- # moment to instantiate an API client, in order to avoid
- # tripping up clients that don't have access to an API server.
- # If we do build one, make sure our Keep client uses it.
- # If instantiation fails, we'll fall back to the except clause,
- # just like any other Collection lookup failure.
- if self._api_client is None:
- self._api_client = arvados.api('v1')
- self._keep_client = KeepClient(api_client=self._api_client)
- if self._keep_client is None:
- self._keep_client = KeepClient(api_client=self._api_client)
- c = self._api_client.collections().get(
- uuid=self._manifest_locator).execute()
- self._manifest_text = c['manifest_text']
- except Exception as e:
- if not util.portable_data_hash_pattern.match(
- self._manifest_locator):
- raise
- _logger.warning("API lookup failed for collection %s (%s: %s)",
- self._manifest_locator, type(e), str(e))
- if self._keep_client is None:
- self._keep_client = KeepClient(api_client=self._api_client)
- self._manifest_text = self._keep_client.get(self._manifest_locator)
- self._streams = []
- for stream_line in self._manifest_text.split("\n"):
- if stream_line != '':
- stream_tokens = stream_line.split()
- self._streams += [stream_tokens]
- self._streams = normalize(self)
-
- # now regenerate the manifest text based on the normalized stream
-
- #print "normalizing", self._manifest_text
- self._manifest_text = ''.join([StreamReader(stream).manifest_text() for stream in self._streams])
- #print "result", self._manifest_text
+ def _my_keep(self):
+ if self._keep_client is None:
+ self._keep_client = KeepClient(api_client=self._api_client,
+ num_retries=self.num_retries)
+ return self._keep_client
+ def stripped_manifest(self):
+ """Get the manifest with locator hints stripped.
- def all_streams(self):
- self._populate()
- resp = []
- for s in self._streams:
- resp.append(StreamReader(s))
- return resp
+ Return the manifest for the current collection with all
+ non-portable hints (i.e., permission signatures and other
+ hints other than size hints) removed from the locators.
+ """
+ raw = self.manifest_text()
+ clean = []
+ for line in raw.split("\n"):
+ fields = line.split()
+ if fields:
+ clean_fields = fields[:1] + [
+ (re.sub(r'\+[^\d][^\+]*', '', x)
+ if re.match(util.keep_locator_pattern, x)
+ else x)
+ for x in fields[1:]]
+ clean += [' '.join(clean_fields), "\n"]
+ return ''.join(clean)
- def all_files(self):
- for s in self.all_streams():
- for f in s.all_files():
- yield f
- def manifest_text(self, strip=False):
- self._populate()
- if strip:
- m = ''.join([StreamReader(stream).manifest_text(strip=True) for stream in self._streams])
- return m
- else:
- return self._manifest_text
+class _WriterFile(_FileLikeObjectBase):
+ def __init__(self, coll_writer, name):
+ super(_WriterFile, self).__init__(name, 'wb')
+ self.dest = coll_writer
-class CollectionWriter(object):
- KEEP_BLOCK_SIZE = 2**26
+ def close(self):
+ super(_WriterFile, self).close()
+ self.dest.finish_current_file()
- def __init__(self, api_client=None):
+ @_FileLikeObjectBase._before_close
+ def write(self, data):
+ self.dest.write(data)
+
+ @_FileLikeObjectBase._before_close
+ def writelines(self, seq):
+ for data in seq:
+ self.write(data)
+
+ @_FileLikeObjectBase._before_close
+ def flush(self):
+ self.dest.flush_data()
+
+
+class CollectionWriter(CollectionBase):
+ def __init__(self, api_client=None, num_retries=0, replication=None):
+ """Instantiate a CollectionWriter.
+
+ CollectionWriter lets you build a new Arvados Collection from scratch.
+ Write files to it. The CollectionWriter will upload data to Keep as
+ appropriate, and provide you with the Collection manifest text when
+ you're finished.
+
+ Arguments:
+ * api_client: The API client to use to look up Collections. If not
+ provided, CollectionReader will build one from available Arvados
+ configuration.
+ * num_retries: The default number of times to retry failed
+ service requests. Default 0. You may change this value
+ after instantiation, but note those changes may not
+ propagate to related objects like the Keep client.
+ * replication: The number of copies of each block to store.
+ If this argument is None or not supplied, replication is
+ the server-provided default if available, otherwise 2.
+ """
self._api_client = api_client
+ self.num_retries = num_retries
+ self.replication = (2 if replication is None else replication)
self._keep_client = None
self._data_buffer = []
self._data_buffer_len = 0
self._queued_file = None
self._queued_dirents = deque()
self._queued_trees = deque()
+ self._last_open = None
- def __enter__(self):
- pass
-
- def __exit__(self):
- self.finish()
-
- def _prep_keep_client(self):
- if self._keep_client is None:
- self._keep_client = KeepClient(api_client=self._api_client)
+ def __exit__(self, exc_type, exc_value, traceback):
+ if exc_type is None:
+ self.finish()
def do_queued_work(self):
# The work queue consists of three pieces:
def _work_file(self):
while True:
- buf = self._queued_file.read(self.KEEP_BLOCK_SIZE)
+ buf = self._queued_file.read(config.KEEP_BLOCK_SIZE)
if not buf:
break
self.write(buf)
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)
- d = make_dirents(path)
- if len(d) > 0:
+ d = util.listdir_recursive(
+ path, max_depth = (None if max_manifest_depth == 0 else 0))
+ if d:
self._queue_dirents(stream_name, d)
else:
self._queued_trees.popleft()
for s in newdata:
self.write(s)
return
- self._data_buffer += [newdata]
+ self._data_buffer.append(newdata)
self._data_buffer_len += len(newdata)
self._current_stream_length += len(newdata)
- while self._data_buffer_len >= self.KEEP_BLOCK_SIZE:
+ while self._data_buffer_len >= config.KEEP_BLOCK_SIZE:
self.flush_data()
+ def open(self, streampath, filename=None):
+ """open(streampath[, filename]) -> file-like object
+
+ Pass in the path of a file to write to the Collection, either as a
+ single string or as two separate stream name and file name arguments.
+ This method returns a file-like object you can write to add it to the
+ Collection.
+
+ You may only have one file object from the Collection open at a time,
+ so be sure to close the object when you're done. Using the object in
+ a with statement makes that easy::
+
+ with cwriter.open('./doc/page1.txt') as outfile:
+ outfile.write(page1_data)
+ with cwriter.open('./doc/page2.txt') as outfile:
+ outfile.write(page2_data)
+ """
+ if filename is None:
+ streampath, filename = split(streampath)
+ if self._last_open and not self._last_open.closed:
+ raise errors.AssertionError(
+ "can't open '{}' when '{}' is still open".format(
+ filename, self._last_open.name))
+ if streampath != self.current_stream_name():
+ self.start_new_stream(streampath)
+ self.set_current_file_name(filename)
+ self._last_open = _WriterFile(self, filename)
+ return self._last_open
+
def flush_data(self):
data_buffer = ''.join(self._data_buffer)
- if data_buffer != '':
- self._prep_keep_client()
+ if data_buffer:
self._current_stream_locators.append(
- self._keep_client.put(data_buffer[0:self.KEEP_BLOCK_SIZE]))
- self._data_buffer = [data_buffer[self.KEEP_BLOCK_SIZE:]]
+ self._my_keep().put(
+ data_buffer[0:config.KEEP_BLOCK_SIZE],
+ copies=self.replication))
+ self._data_buffer = [data_buffer[config.KEEP_BLOCK_SIZE:]]
self._data_buffer_len = len(self._data_buffer[0])
def start_new_file(self, newfilename=None):
raise errors.AssertionError(
"Manifest filenames cannot contain whitespace: %s" %
newfilename)
+ elif re.search(r'\x00', newfilename):
+ raise errors.AssertionError(
+ "Manifest filenames cannot contain NUL characters: %s" %
+ newfilename)
self._current_file_name = newfilename
def current_file_name(self):
return self._current_file_name
def finish_current_file(self):
- if self._current_file_name == None:
+ if self._current_file_name is None:
if self._current_file_pos == self._current_stream_length:
return
raise errors.AssertionError(
(self._current_stream_length - self._current_file_pos,
self._current_file_pos,
self._current_stream_name))
- self._current_stream_files += [[self._current_file_pos,
- self._current_stream_length - self._current_file_pos,
- self._current_file_name]]
+ self._current_stream_files.append([
+ self._current_file_pos,
+ self._current_stream_length - self._current_file_pos,
+ self._current_file_name])
self._current_file_pos = self._current_stream_length
+ self._current_file_name = None
def start_new_stream(self, newstreamname='.'):
self.finish_current_stream()
def finish_current_stream(self):
self.finish_current_file()
self.flush_data()
- if len(self._current_stream_files) == 0:
+ if not self._current_stream_files:
pass
- elif self._current_stream_name == None:
+ elif self._current_stream_name is None:
raise errors.AssertionError(
"Cannot finish an unnamed stream (%d bytes in %d files)" %
(self._current_stream_length, len(self._current_stream_files)))
else:
- if len(self._current_stream_locators) == 0:
- self._current_stream_locators += [config.EMPTY_BLOCK_LOCATOR]
- self._finished_streams += [[self._current_stream_name,
- self._current_stream_locators,
- self._current_stream_files]]
+ if not self._current_stream_locators:
+ self._current_stream_locators.append(config.EMPTY_BLOCK_LOCATOR)
+ self._finished_streams.append([self._current_stream_name,
+ self._current_stream_locators,
+ self._current_stream_files])
self._current_stream_files = []
self._current_stream_length = 0
self._current_stream_locators = []
self._current_file_name = None
def finish(self):
- # Store the manifest in Keep and return its locator.
- self._prep_keep_client()
- return self._keep_client.put(self.manifest_text())
+ """Store the manifest in Keep and return its locator.
- def stripped_manifest(self):
- """
- Return the manifest for the current collection with all permission
- hints removed from the locators in the manifest.
+ This is useful for storing manifest fragments (task outputs)
+ temporarily in Keep during a Crunch job.
+
+ In other cases you should make a collection instead, by
+ sending manifest_text() to the API server's "create
+ collection" endpoint.
"""
- raw = self.manifest_text()
- clean = ''
- for line in raw.split("\n"):
- fields = line.split()
- if len(fields) > 0:
- locators = [ re.sub(r'\+A[a-z0-9@_-]+', '', x)
- for x in fields[1:-1] ]
- clean += fields[0] + ' ' + ' '.join(locators) + ' ' + fields[-1] + "\n"
- return clean
+ return self._my_keep().put(self.manifest_text(), copies=self.replication)
+
+ def portable_data_hash(self):
+ stripped = self.stripped_manifest()
+ return hashlib.md5(stripped).hexdigest() + '+' + str(len(stripped))
def manifest_text(self):
self.finish_current_stream()
manifest += ' ' + ' '.join("%d:%d:%s" % (sfile[0], sfile[1], sfile[2].replace(' ', '\\040')) for sfile in stream[2])
manifest += "\n"
- if len(manifest) > 0:
- return CollectionReader(manifest).manifest_text()
- else:
- return ""
+ return manifest
def data_locators(self):
ret = []
'_data_buffer', '_dependencies', '_finished_streams',
'_queued_dirents', '_queued_trees']
- def __init__(self, api_client=None):
+ def __init__(self, api_client=None, **kwargs):
self._dependencies = {}
- super(ResumableCollectionWriter, self).__init__(api_client)
+ super(ResumableCollectionWriter, self).__init__(api_client, **kwargs)
@classmethod
def from_state(cls, state, *init_args, **init_kwargs):
raise errors.AssertionError(
"resumable writer can't accept unsourced data")
return super(ResumableCollectionWriter, self).write(data)
+
+
+ADD = "add"
+DEL = "del"
+MOD = "mod"
+FILE = "file"
+COLLECTION = "collection"
+
+class RichCollectionBase(CollectionBase):
+ """Base class for Collections and Subcollections.
+
+ Implements the majority of functionality relating to accessing items in the
+ Collection.
+
+ """
+
+ def __init__(self, parent=None):
+ self.parent = parent
+ self._committed = False
+ self._callback = None
+ self._items = {}
+
+ def _my_api(self):
+ raise NotImplementedError()
+
+ def _my_keep(self):
+ raise NotImplementedError()
+
+ def _my_block_manager(self):
+ raise NotImplementedError()
+
+ def writable(self):
+ raise NotImplementedError()
+
+ def root_collection(self):
+ raise NotImplementedError()
+
+ def notify(self, event, collection, name, item):
+ raise NotImplementedError()
+
+ def stream_name(self):
+ raise NotImplementedError()
+
+ @must_be_writable
+ @synchronized
+ def find_or_create(self, path, create_type):
+ """Recursively search the specified file path.
+
+ May return either a `Collection` or `ArvadosFile`. If not found, will
+ create a new item at the specified path based on `create_type`. Will
+ create intermediate subcollections needed to contain the final item in
+ the path.
+
+ :create_type:
+ One of `arvados.collection.FILE` or
+ `arvados.collection.COLLECTION`. If the path is not found, and value
+ of create_type is FILE then create and return a new ArvadosFile for
+ the last path component. If COLLECTION, then create and return a new
+ Collection for the last path component.
+
+ """
+
+ pathcomponents = path.split("/", 1)
+ if pathcomponents[0]:
+ item = self._items.get(pathcomponents[0])
+ if len(pathcomponents) == 1:
+ if item is None:
+ # create new file
+ if create_type == COLLECTION:
+ item = Subcollection(self, pathcomponents[0])
+ else:
+ item = ArvadosFile(self, pathcomponents[0])
+ self._items[pathcomponents[0]] = item
+ self._committed = False
+ self.notify(ADD, self, pathcomponents[0], item)
+ return item
+ else:
+ if item is None:
+ # create new collection
+ item = Subcollection(self, pathcomponents[0])
+ self._items[pathcomponents[0]] = item
+ self._committed = False
+ self.notify(ADD, self, pathcomponents[0], item)
+ if isinstance(item, RichCollectionBase):
+ return item.find_or_create(pathcomponents[1], create_type)
+ else:
+ raise IOError(errno.ENOTDIR, "Not a directory: '%s'" % pathcomponents[0])
+ else:
+ return self
+
+ @synchronized
+ def find(self, path):
+ """Recursively search the specified file path.
+
+ May return either a Collection or ArvadosFile. Return None if not
+ found.
+
+ """
+ if not path:
+ raise errors.ArgumentError("Parameter 'path' is empty.")
+
+ pathcomponents = path.split("/", 1)
+ item = self._items.get(pathcomponents[0])
+ if len(pathcomponents) == 1:
+ return item
+ else:
+ if isinstance(item, RichCollectionBase):
+ if pathcomponents[1]:
+ return item.find(pathcomponents[1])
+ else:
+ return item
+ else:
+ raise IOError(errno.ENOTDIR, "Is not a directory: %s" % pathcomponents[0])
+
+ @synchronized
+ def mkdirs(self, path):
+ """Recursive subcollection create.
+
+ Like `os.makedirs()`. Will create intermediate subcollections needed
+ to contain the leaf subcollection path.
+
+ """
+
+ if self.find(path) != None:
+ raise IOError(errno.EEXIST, "Directory or file exists: '%s'" % path)
+
+ return self.find_or_create(path, COLLECTION)
+
+ def open(self, path, mode="r"):
+ """Open a file-like object for access.
+
+ :path:
+ path to a file in the collection
+ :mode:
+ one of "r", "r+", "w", "w+", "a", "a+"
+ :"r":
+ opens for reading
+ :"r+":
+ opens for reading and writing. Reads/writes share a file pointer.
+ :"w", "w+":
+ truncates to 0 and opens for reading and writing. Reads/writes share a file pointer.
+ :"a", "a+":
+ opens for reading and writing. All writes are appended to
+ the end of the file. Writing does not affect the file pointer for
+ reading.
+ """
+ mode = mode.replace("b", "")
+ if len(mode) == 0 or mode[0] not in ("r", "w", "a"):
+ raise errors.ArgumentError("Bad mode '%s'" % mode)
+ create = (mode != "r")
+
+ if create and not self.writable():
+ raise IOError(errno.EROFS, "Collection is read only")
+
+ if create:
+ arvfile = self.find_or_create(path, FILE)
+ else:
+ arvfile = self.find(path)
+
+ if arvfile is None:
+ raise IOError(errno.ENOENT, "File not found")
+ if not isinstance(arvfile, ArvadosFile):
+ raise IOError(errno.EISDIR, "Is a directory: %s" % path)
+
+ if mode[0] == "w":
+ arvfile.truncate(0)
+
+ name = os.path.basename(path)
+
+ if mode == "r":
+ return ArvadosFileReader(arvfile, num_retries=self.num_retries)
+ else:
+ return ArvadosFileWriter(arvfile, mode, num_retries=self.num_retries)
+
+ def modified(self):
+ """Determine if the collection has been modified since last commited."""
+ return not self.committed()
+
+ @synchronized
+ def committed(self):
+ """Determine if the collection has been committed to the API server."""
+
+ if self._committed is False:
+ return False
+ for v in self._items.values():
+ if v.committed() is False:
+ return False
+ return True
+
+ @synchronized
+ def set_committed(self):
+ """Recursively set committed flag to True."""
+ self._committed = True
+ for k,v in self._items.items():
+ v.set_committed()
+
+ @synchronized
+ def __iter__(self):
+ """Iterate over names of files and collections contained in this collection."""
+ return iter(self._items.keys())
+
+ @synchronized
+ def __getitem__(self, k):
+ """Get a file or collection that is directly contained by this collection.
+
+ If you want to search a path, use `find()` instead.
+
+ """
+ return self._items[k]
+
+ @synchronized
+ def __contains__(self, k):
+ """Test if there is a file or collection a directly contained by this collection."""
+ return k in self._items
+
+ @synchronized
+ def __len__(self):
+ """Get the number of items directly contained in this collection."""
+ return len(self._items)
+
+ @must_be_writable
+ @synchronized
+ def __delitem__(self, p):
+ """Delete an item by name which is directly contained by this collection."""
+ del self._items[p]
+ self._committed = False
+ self.notify(DEL, self, p, None)
+
+ @synchronized
+ def keys(self):
+ """Get a list of names of files and collections directly contained in this collection."""
+ return self._items.keys()
+
+ @synchronized
+ def values(self):
+ """Get a list of files and collection objects directly contained in this collection."""
+ return self._items.values()
+
+ @synchronized
+ def items(self):
+ """Get a list of (name, object) tuples directly contained in this collection."""
+ return self._items.items()
+
+ def exists(self, path):
+ """Test if there is a file or collection at `path`."""
+ return self.find(path) is not None
+
+ @must_be_writable
+ @synchronized
+ def remove(self, path, recursive=False):
+ """Remove the file or subcollection (directory) at `path`.
+
+ :recursive:
+ Specify whether to remove non-empty subcollections (True), or raise an error (False).
+ """
+
+ if not path:
+ raise errors.ArgumentError("Parameter 'path' is empty.")
+
+ pathcomponents = path.split("/", 1)
+ item = self._items.get(pathcomponents[0])
+ if item is None:
+ raise IOError(errno.ENOENT, "File not found")
+ if len(pathcomponents) == 1:
+ if isinstance(self._items[pathcomponents[0]], RichCollectionBase) and len(self._items[pathcomponents[0]]) > 0 and not recursive:
+ raise IOError(errno.ENOTEMPTY, "Subcollection not empty")
+ deleteditem = self._items[pathcomponents[0]]
+ del self._items[pathcomponents[0]]
+ self._committed = False
+ self.notify(DEL, self, pathcomponents[0], deleteditem)
+ else:
+ item.remove(pathcomponents[1])
+
+ def _clonefrom(self, source):
+ for k,v in source.items():
+ self._items[k] = v.clone(self, k)
+
+ def clone(self):
+ raise NotImplementedError()
+
+ @must_be_writable
+ @synchronized
+ def add(self, source_obj, target_name, overwrite=False, reparent=False):
+ """Copy or move a file or subcollection to this collection.
+
+ :source_obj:
+ An ArvadosFile, or Subcollection object
+
+ :target_name:
+ Destination item name. If the target name already exists and is a
+ file, this will raise an error unless you specify `overwrite=True`.
+
+ :overwrite:
+ Whether to overwrite target file if it already exists.
+
+ :reparent:
+ If True, source_obj will be moved from its parent collection to this collection.
+ If False, source_obj will be copied and the parent collection will be
+ unmodified.
+
+ """
+
+ if target_name in self and not overwrite:
+ raise IOError(errno.EEXIST, "File already exists")
+
+ modified_from = None
+ if target_name in self:
+ modified_from = self[target_name]
+
+ # Actually make the move or copy.
+ if reparent:
+ source_obj._reparent(self, target_name)
+ item = source_obj
+ else:
+ item = source_obj.clone(self, target_name)
+
+ self._items[target_name] = item
+ self._committed = False
+
+ if modified_from:
+ self.notify(MOD, self, target_name, (modified_from, item))
+ else:
+ self.notify(ADD, self, target_name, item)
+
+ def _get_src_target(self, source, target_path, source_collection, create_dest):
+ if source_collection is None:
+ source_collection = self
+
+ # Find the object
+ if isinstance(source, basestring):
+ source_obj = source_collection.find(source)
+ if source_obj is None:
+ raise IOError(errno.ENOENT, "File not found")
+ sourcecomponents = source.split("/")
+ else:
+ source_obj = source
+ sourcecomponents = None
+
+ # Find parent collection the target path
+ targetcomponents = target_path.split("/")
+
+ # Determine the name to use.
+ target_name = targetcomponents[-1] if targetcomponents[-1] else sourcecomponents[-1]
+
+ if not target_name:
+ raise errors.ArgumentError("Target path is empty and source is an object. Cannot determine destination filename to use.")
+
+ if create_dest:
+ target_dir = self.find_or_create("/".join(targetcomponents[0:-1]), COLLECTION)
+ else:
+ if len(targetcomponents) > 1:
+ target_dir = self.find("/".join(targetcomponents[0:-1]))
+ else:
+ target_dir = self
+
+ if target_dir is None:
+ raise IOError(errno.ENOENT, "Target directory not found.")
+
+ if target_name in target_dir and isinstance(self[target_name], RichCollectionBase) and sourcecomponents:
+ target_dir = target_dir[target_name]
+ target_name = sourcecomponents[-1]
+
+ return (source_obj, target_dir, target_name)
+
+ @must_be_writable
+ @synchronized
+ def copy(self, source, target_path, source_collection=None, overwrite=False):
+ """Copy a file or subcollection to a new path in this collection.
+
+ :source:
+ A string with a path to source file or subcollection, or an actual ArvadosFile or Subcollection object.
+
+ :target_path:
+ Destination file or path. If the target path already exists and is a
+ subcollection, the item will be placed inside the subcollection. If
+ the target path already exists and is a file, this will raise an error
+ unless you specify `overwrite=True`.
+
+ :source_collection:
+ Collection to copy `source_path` from (default `self`)
+
+ :overwrite:
+ Whether to overwrite target file if it already exists.
+ """
+
+ source_obj, target_dir, target_name = self._get_src_target(source, target_path, source_collection, True)
+ target_dir.add(source_obj, target_name, overwrite, False)
+
+ @must_be_writable
+ @synchronized
+ def rename(self, source, target_path, source_collection=None, overwrite=False):
+ """Move a file or subcollection from `source_collection` to a new path in this collection.
+
+ :source:
+ A string with a path to source file or subcollection.
+
+ :target_path:
+ Destination file or path. If the target path already exists and is a
+ subcollection, the item will be placed inside the subcollection. If
+ the target path already exists and is a file, this will raise an error
+ unless you specify `overwrite=True`.
+
+ :source_collection:
+ Collection to copy `source_path` from (default `self`)
+
+ :overwrite:
+ Whether to overwrite target file if it already exists.
+ """
+
+ source_obj, target_dir, target_name = self._get_src_target(source, target_path, source_collection, False)
+ if not source_obj.writable():
+ raise IOError(errno.EROFS, "Source collection is read only.")
+ target_dir.add(source_obj, target_name, overwrite, True)
+
+ def portable_manifest_text(self, stream_name="."):
+ """Get the manifest text for this collection, sub collections and files.
+
+ This method does not flush outstanding blocks to Keep. It will return
+ a normalized manifest with access tokens stripped.
+
+ :stream_name:
+ Name to use for this stream (directory)
+
+ """
+ return self._get_manifest_text(stream_name, True, True)
+
+ @synchronized
+ def manifest_text(self, stream_name=".", strip=False, normalize=False):
+ """Get the manifest text for this collection, sub collections and files.
+
+ This method will flush outstanding blocks to Keep. By default, it will
+ not normalize an unmodified manifest or strip access tokens.
+
+ :stream_name:
+ Name to use for this stream (directory)
+
+ :strip:
+ If True, remove signing tokens from block locators if present.
+ If False (default), block locators are left unchanged.
+
+ :normalize:
+ If True, always export the manifest text in normalized form
+ even if the Collection is not modified. If False (default) and the collection
+ is not modified, return the original manifest text even if it is not
+ in normalized form.
+
+ """
+
+ self._my_block_manager().commit_all()
+ return self._get_manifest_text(stream_name, strip, normalize)
+
+ @synchronized
+ def _get_manifest_text(self, stream_name, strip, normalize):
+ """Get the manifest text for this collection, sub collections and files.
+
+ :stream_name:
+ Name to use for this stream (directory)
+
+ :strip:
+ If True, remove signing tokens from block locators if present.
+ If False (default), block locators are left unchanged.
+
+ :normalize:
+ If True, always export the manifest text in normalized form
+ even if the Collection is not modified. If False (default) and the collection
+ is not modified, return the original manifest text even if it is not
+ in normalized form.
+
+ """
+
+ if not self.committed() or self._manifest_text is None or normalize:
+ stream = {}
+ buf = []
+ sorted_keys = sorted(self.keys())
+ for filename in [s for s in sorted_keys if isinstance(self[s], ArvadosFile)]:
+ # Create a stream per file `k`
+ arvfile = self[filename]
+ filestream = []
+ for segment in arvfile.segments():
+ loc = segment.locator
+ if arvfile.parent._my_block_manager().is_bufferblock(loc):
+ loc = arvfile.parent._my_block_manager().get_bufferblock(loc).locator()
+ if strip:
+ loc = KeepLocator(loc).stripped()
+ filestream.append(LocatorAndRange(loc, KeepLocator(loc).size,
+ segment.segment_offset, segment.range_size))
+ stream[filename] = filestream
+ if stream:
+ buf.append(" ".join(normalize_stream(stream_name, stream)) + "\n")
+ for dirname in [s for s in sorted_keys if isinstance(self[s], RichCollectionBase)]:
+ buf.append(self[dirname].manifest_text(stream_name=os.path.join(stream_name, dirname), strip=strip, normalize=True))
+ return "".join(buf)
+ else:
+ if strip:
+ return self.stripped_manifest()
+ else:
+ return self._manifest_text
+
+ @synchronized
+ def diff(self, end_collection, prefix=".", holding_collection=None):
+ """Generate list of add/modify/delete actions.
+
+ When given to `apply`, will change `self` to match `end_collection`
+
+ """
+ changes = []
+ if holding_collection is None:
+ holding_collection = Collection(api_client=self._my_api(), keep_client=self._my_keep())
+ for k in self:
+ if k not in end_collection:
+ changes.append((DEL, os.path.join(prefix, k), self[k].clone(holding_collection, "")))
+ for k in end_collection:
+ if k in self:
+ if isinstance(end_collection[k], Subcollection) and isinstance(self[k], Subcollection):
+ changes.extend(self[k].diff(end_collection[k], os.path.join(prefix, k), holding_collection))
+ elif end_collection[k] != self[k]:
+ changes.append((MOD, os.path.join(prefix, k), self[k].clone(holding_collection, ""), end_collection[k].clone(holding_collection, "")))
+ else:
+ changes.append((ADD, os.path.join(prefix, k), end_collection[k].clone(holding_collection, "")))
+ return changes
+
+ @must_be_writable
+ @synchronized
+ def apply(self, changes):
+ """Apply changes from `diff`.
+
+ If a change conflicts with a local change, it will be saved to an
+ alternate path indicating the conflict.
+
+ """
+ if changes:
+ self._committed = False
+ for change in changes:
+ event_type = change[0]
+ path = change[1]
+ initial = change[2]
+ local = self.find(path)
+ conflictpath = "%s~%s~conflict~" % (path, time.strftime("%Y%m%d-%H%M%S",
+ time.gmtime()))
+ if event_type == ADD:
+ if local is None:
+ # No local file at path, safe to copy over new file
+ self.copy(initial, path)
+ elif local is not None and local != initial:
+ # There is already local file and it is different:
+ # save change to conflict file.
+ self.copy(initial, conflictpath)
+ elif event_type == MOD:
+ final = change[3]
+ if local == initial:
+ # Local matches the "initial" item so it has not
+ # changed locally and is safe to update.
+ if isinstance(local, ArvadosFile) and isinstance(final, ArvadosFile):
+ # Replace contents of local file with new contents
+ local.replace_contents(final)
+ else:
+ # Overwrite path with new item; this can happen if
+ # path was a file and is now a collection or vice versa
+ self.copy(final, path, overwrite=True)
+ else:
+ # Local is missing (presumably deleted) or local doesn't
+ # match the "start" value, so save change to conflict file
+ self.copy(final, conflictpath)
+ elif event_type == DEL:
+ if local == initial:
+ # Local item matches "initial" value, so it is safe to remove.
+ self.remove(path, recursive=True)
+ # else, the file is modified or already removed, in either
+ # case we don't want to try to remove it.
+
+ def portable_data_hash(self):
+ """Get the portable data hash for this collection's manifest."""
+ stripped = self.portable_manifest_text()
+ return hashlib.md5(stripped).hexdigest() + '+' + str(len(stripped))
+
+ @synchronized
+ def subscribe(self, callback):
+ if self._callback is None:
+ self._callback = callback
+ else:
+ raise errors.ArgumentError("A callback is already set on this collection.")
+
+ @synchronized
+ def unsubscribe(self):
+ if self._callback is not None:
+ self._callback = None
+
+ @synchronized
+ def notify(self, event, collection, name, item):
+ if self._callback:
+ self._callback(event, collection, name, item)
+ self.root_collection().notify(event, collection, name, item)
+
+ @synchronized
+ def __eq__(self, other):
+ if other is self:
+ return True
+ if not isinstance(other, RichCollectionBase):
+ return False
+ if len(self._items) != len(other):
+ return False
+ for k in self._items:
+ if k not in other:
+ return False
+ if self._items[k] != other[k]:
+ return False
+ return True
+
+ def __ne__(self, other):
+ return not self.__eq__(other)
+
+ @synchronized
+ def flush(self):
+ """Flush bufferblocks to Keep."""
+ for e in self.values():
+ e.flush()
+
+
+class Collection(RichCollectionBase):
+ """Represents the root of an Arvados Collection.
+
+ This class is threadsafe. The root collection object, all subcollections
+ and files are protected by a single lock (i.e. each access locks the entire
+ collection).
+
+ Brief summary of
+ useful methods:
+
+ :To read an existing file:
+ `c.open("myfile", "r")`
+
+ :To write a new file:
+ `c.open("myfile", "w")`
+
+ :To determine if a file exists:
+ `c.find("myfile") is not None`
+
+ :To copy a file:
+ `c.copy("source", "dest")`
+
+ :To delete a file:
+ `c.remove("myfile")`
+
+ :To save to an existing collection record:
+ `c.save()`
+
+ :To save a new collection record:
+ `c.save_new()`
+
+ :To merge remote changes into this object:
+ `c.update()`
+
+ Must be associated with an API server Collection record (during
+ initialization, or using `save_new`) to use `save` or `update`
+
+ """
+
+ def __init__(self, manifest_locator_or_text=None,
+ api_client=None,
+ keep_client=None,
+ num_retries=None,
+ parent=None,
+ apiconfig=None,
+ block_manager=None):
+ """Collection constructor.
+
+ :manifest_locator_or_text:
+ One of Arvados collection UUID, block locator of
+ a manifest, raw manifest text, or None (to create an empty collection).
+ :parent:
+ the parent Collection, may be None.
+ :apiconfig:
+ A dict containing keys for ARVADOS_API_HOST and ARVADOS_API_TOKEN.
+ Prefer this over supplying your own api_client and keep_client (except in testing).
+ Will use default config settings if not specified.
+ :api_client:
+ The API client object to use for requests. If not specified, create one using `apiconfig`.
+ :keep_client:
+ the Keep client to use for requests. If not specified, create one using `apiconfig`.
+ :num_retries:
+ the number of retries for API and Keep requests.
+ :block_manager:
+ the block manager to use. If not specified, create one.
+
+ """
+ super(Collection, self).__init__(parent)
+ self._api_client = api_client
+ self._keep_client = keep_client
+ self._block_manager = block_manager
+
+ if apiconfig:
+ self._config = apiconfig
+ else:
+ self._config = config.settings()
+
+ self.num_retries = num_retries if num_retries is not None else 0
+ self._manifest_locator = None
+ self._manifest_text = None
+ self._api_response = None
+ self._past_versions = set()
+
+ self.lock = threading.RLock()
+ self.events = None
+
+ if manifest_locator_or_text:
+ if re.match(util.keep_locator_pattern, manifest_locator_or_text):
+ self._manifest_locator = manifest_locator_or_text
+ elif re.match(util.collection_uuid_pattern, manifest_locator_or_text):
+ self._manifest_locator = manifest_locator_or_text
+ elif re.match(util.manifest_pattern, manifest_locator_or_text):
+ self._manifest_text = manifest_locator_or_text
+ else:
+ raise errors.ArgumentError(
+ "Argument to CollectionReader is not a manifest or a collection UUID")
+
+ try:
+ self._populate()
+ except (IOError, errors.SyntaxError) as e:
+ raise errors.ArgumentError("Error processing manifest text: %s", e)
+
+ def root_collection(self):
+ return self
+
+ def stream_name(self):
+ return "."
+
+ def writable(self):
+ return True
+
+ @synchronized
+ def known_past_version(self, modified_at_and_portable_data_hash):
+ return modified_at_and_portable_data_hash in self._past_versions
+
+ @synchronized
+ @retry_method
+ def update(self, other=None, num_retries=None):
+ """Merge the latest collection on the API server with the current collection."""
+
+ if other is None:
+ if self._manifest_locator is None:
+ raise errors.ArgumentError("`other` is None but collection does not have a manifest_locator uuid")
+ response = self._my_api().collections().get(uuid=self._manifest_locator).execute(num_retries=num_retries)
+ if self.known_past_version((response.get("modified_at"), response.get("portable_data_hash"))):
+ # We've merged this record this before. Don't do anything.
+ return
+ else:
+ self._past_versions.add((response.get("modified_at"), response.get("portable_data_hash")))
+ other = CollectionReader(response["manifest_text"])
+ baseline = CollectionReader(self._manifest_text)
+ self.apply(baseline.diff(other))
+ self._manifest_text = self.manifest_text()
+
+ @synchronized
+ def _my_api(self):
+ if self._api_client is None:
+ self._api_client = ThreadSafeApiCache(self._config)
+ self._keep_client = self._api_client.keep
+ return self._api_client
+
+ @synchronized
+ def _my_keep(self):
+ if self._keep_client is None:
+ if self._api_client is None:
+ self._my_api()
+ else:
+ self._keep_client = KeepClient(api_client=self._api_client)
+ return self._keep_client
+
+ @synchronized
+ def _my_block_manager(self):
+ if self._block_manager is None:
+ self._block_manager = _BlockManager(self._my_keep())
+ return self._block_manager
+
+ def _remember_api_response(self, response):
+ self._api_response = response
+ self._past_versions.add((response.get("modified_at"), response.get("portable_data_hash")))
+
+ def _populate_from_api_server(self):
+ # As in KeepClient itself, we must wait until the last
+ # possible moment to instantiate an API client, in order to
+ # avoid tripping up clients that don't have access to an API
+ # server. If we do build one, make sure our Keep client uses
+ # it. If instantiation fails, we'll fall back to the except
+ # clause, just like any other Collection lookup
+ # failure. Return an exception, or None if successful.
+ try:
+ self._remember_api_response(self._my_api().collections().get(
+ uuid=self._manifest_locator).execute(
+ num_retries=self.num_retries))
+ self._manifest_text = self._api_response['manifest_text']
+ return None
+ except Exception as e:
+ return e
+
+ def _populate_from_keep(self):
+ # Retrieve a manifest directly from Keep. This has a chance of
+ # working if [a] the locator includes a permission signature
+ # or [b] the Keep services are operating in world-readable
+ # mode. Return an exception, or None if successful.
+ try:
+ self._manifest_text = self._my_keep().get(
+ self._manifest_locator, num_retries=self.num_retries)
+ except Exception as e:
+ return e
+
+ def _populate(self):
+ if self._manifest_locator is None and self._manifest_text is None:
+ return
+ error_via_api = None
+ error_via_keep = None
+ should_try_keep = ((self._manifest_text is None) and
+ util.keep_locator_pattern.match(
+ self._manifest_locator))
+ if ((self._manifest_text is None) and
+ util.signed_locator_pattern.match(self._manifest_locator)):
+ error_via_keep = self._populate_from_keep()
+ if self._manifest_text is None:
+ error_via_api = self._populate_from_api_server()
+ if error_via_api is not None and not should_try_keep:
+ raise error_via_api
+ if ((self._manifest_text is None) and
+ not error_via_keep and
+ should_try_keep):
+ # Looks like a keep locator, and we didn't already try keep above
+ error_via_keep = self._populate_from_keep()
+ if self._manifest_text is None:
+ # Nothing worked!
+ raise errors.NotFoundError(
+ ("Failed to retrieve collection '{}' " +
+ "from either API server ({}) or Keep ({})."
+ ).format(
+ self._manifest_locator,
+ error_via_api,
+ error_via_keep))
+ # populate
+ self._baseline_manifest = self._manifest_text
+ self._import_manifest(self._manifest_text)
+
+
+ def _has_collection_uuid(self):
+ return self._manifest_locator is not None and re.match(util.collection_uuid_pattern, self._manifest_locator)
+
+ def __enter__(self):
+ return self
+
+ def __exit__(self, exc_type, exc_value, traceback):
+ """Support scoped auto-commit in a with: block."""
+ if exc_type is None:
+ if self.writable() and self._has_collection_uuid():
+ self.save()
+ self.stop_threads()
+
+ def stop_threads(self):
+ if self._block_manager is not None:
+ self._block_manager.stop_threads()
+
+ @synchronized
+ def manifest_locator(self):
+ """Get the manifest locator, if any.
+
+ The manifest locator will be set when the collection is loaded from an
+ API server record or the portable data hash of a manifest.
+
+ The manifest locator will be None if the collection is newly created or
+ was created directly from manifest text. The method `save_new()` will
+ assign a manifest locator.
+
+ """
+ return self._manifest_locator
+
+ @synchronized
+ def clone(self, new_parent=None, new_name=None, readonly=False, new_config=None):
+ if new_config is None:
+ new_config = self._config
+ if readonly:
+ newcollection = CollectionReader(parent=new_parent, apiconfig=new_config)
+ else:
+ newcollection = Collection(parent=new_parent, apiconfig=new_config)
+
+ newcollection._clonefrom(self)
+ return newcollection
+
+ @synchronized
+ def api_response(self):
+ """Returns information about this Collection fetched from the API server.
+
+ If the Collection exists in Keep but not the API server, currently
+ returns None. Future versions may provide a synthetic response.
+
+ """
+ return self._api_response
+
+ def find_or_create(self, path, create_type):
+ """See `RichCollectionBase.find_or_create`"""
+ if path == ".":
+ return self
+ else:
+ return super(Collection, self).find_or_create(path[2:] if path.startswith("./") else path, create_type)
+
+ def find(self, path):
+ """See `RichCollectionBase.find`"""
+ if path == ".":
+ return self
+ else:
+ return super(Collection, self).find(path[2:] if path.startswith("./") else path)
+
+ def remove(self, path, recursive=False):
+ """See `RichCollectionBase.remove`"""
+ if path == ".":
+ raise errors.ArgumentError("Cannot remove '.'")
+ else:
+ return super(Collection, self).remove(path[2:] if path.startswith("./") else path, recursive)
+
+ @must_be_writable
+ @synchronized
+ @retry_method
+ def save(self, merge=True, num_retries=None):
+ """Save collection to an existing collection record.
+
+ Commit pending buffer blocks to Keep, merge with remote record (if
+ merge=True, the default), and update the collection record. Returns
+ the current manifest text.
+
+ Will raise AssertionError if not associated with a collection record on
+ the API server. If you want to save a manifest to Keep only, see
+ `save_new()`.
+
+ :merge:
+ Update and merge remote changes before saving. Otherwise, any
+ remote changes will be ignored and overwritten.
+
+ :num_retries:
+ Retry count on API calls (if None, use the collection default)
+
+ """
+ if not self.committed():
+ if not self._has_collection_uuid():
+ raise AssertionError("Collection manifest_locator is not a collection uuid. Use save_new() for new collections.")
+
+ self._my_block_manager().commit_all()
+
+ if merge:
+ self.update()
+
+ text = self.manifest_text(strip=False)
+ self._remember_api_response(self._my_api().collections().update(
+ uuid=self._manifest_locator,
+ body={'manifest_text': text}
+ ).execute(
+ num_retries=num_retries))
+ self._manifest_text = self._api_response["manifest_text"]
+ self.set_committed()
+
+ return self._manifest_text
+
+
+ @must_be_writable
+ @synchronized
+ @retry_method
+ def save_new(self, name=None,
+ create_collection_record=True,
+ owner_uuid=None,
+ ensure_unique_name=False,
+ num_retries=None):
+ """Save collection to a new collection record.
+
+ Commit pending buffer blocks to Keep and, when create_collection_record
+ is True (default), create a new collection record. After creating a
+ new collection record, this Collection object will be associated with
+ the new record used by `save()`. Returns the current manifest text.
+
+ :name:
+ The collection name.
+
+ :create_collection_record:
+ If True, create a collection record on the API server.
+ If False, only commit blocks to Keep and return the manifest text.
+
+ :owner_uuid:
+ the user, or project uuid that will own this collection.
+ If None, defaults to the current user.
+
+ :ensure_unique_name:
+ If True, ask the API server to rename the collection
+ if it conflicts with a collection with the same name and owner. If
+ False, a name conflict will result in an error.
+
+ :num_retries:
+ Retry count on API calls (if None, use the collection default)
+
+ """
+ self._my_block_manager().commit_all()
+ text = self.manifest_text(strip=False)
+
+ if create_collection_record:
+ if name is None:
+ name = "New collection"
+ ensure_unique_name = True
+
+ body = {"manifest_text": text,
+ "name": name}
+ if owner_uuid:
+ body["owner_uuid"] = owner_uuid
+
+ self._remember_api_response(self._my_api().collections().create(ensure_unique_name=ensure_unique_name, body=body).execute(num_retries=num_retries))
+ text = self._api_response["manifest_text"]
+
+ self._manifest_locator = self._api_response["uuid"]
+
+ self._manifest_text = text
+ self.set_committed()
+
+ return text
+
+ @synchronized
+ def _import_manifest(self, manifest_text):
+ """Import a manifest into a `Collection`.
+
+ :manifest_text:
+ The manifest text to import from.
+
+ """
+ if len(self) > 0:
+ raise ArgumentError("Can only import manifest into an empty collection")
+
+ STREAM_NAME = 0
+ BLOCKS = 1
+ SEGMENTS = 2
+
+ stream_name = None
+ state = STREAM_NAME
+
+ for token_and_separator in re.finditer(r'(\S+)(\s+|$)', manifest_text):
+ tok = token_and_separator.group(1)
+ sep = token_and_separator.group(2)
+
+ if state == STREAM_NAME:
+ # starting a new stream
+ stream_name = tok.replace('\\040', ' ')
+ blocks = []
+ segments = []
+ streamoffset = 0L
+ state = BLOCKS
+ self.find_or_create(stream_name, COLLECTION)
+ continue
+
+ if state == BLOCKS:
+ block_locator = re.match(r'[0-9a-f]{32}\+(\d+)(\+\S+)*', tok)
+ if block_locator:
+ blocksize = long(block_locator.group(1))
+ blocks.append(Range(tok, streamoffset, blocksize, 0))
+ streamoffset += blocksize
+ else:
+ state = SEGMENTS
+
+ if state == SEGMENTS:
+ file_segment = re.search(r'^(\d+):(\d+):(\S+)', tok)
+ if file_segment:
+ pos = long(file_segment.group(1))
+ size = long(file_segment.group(2))
+ name = file_segment.group(3).replace('\\040', ' ')
+ filepath = os.path.join(stream_name, name)
+ afile = self.find_or_create(filepath, FILE)
+ if isinstance(afile, ArvadosFile):
+ afile.add_segment(blocks, pos, size)
+ else:
+ raise errors.SyntaxError("File %s conflicts with stream of the same name.", filepath)
+ else:
+ # error!
+ raise errors.SyntaxError("Invalid manifest format, expected file segment but did not match format: '%s'" % tok)
+
+ if sep == "\n":
+ stream_name = None
+ state = STREAM_NAME
+
+ self.set_committed()
+
+ @synchronized
+ def notify(self, event, collection, name, item):
+ if self._callback:
+ self._callback(event, collection, name, item)
+
+
+class Subcollection(RichCollectionBase):
+ """This is a subdirectory within a collection that doesn't have its own API
+ server record.
+
+ Subcollection locking falls under the umbrella lock of its root collection.
+
+ """
+
+ def __init__(self, parent, name):
+ super(Subcollection, self).__init__(parent)
+ self.lock = self.root_collection().lock
+ self._manifest_text = None
+ self.name = name
+ self.num_retries = parent.num_retries
+
+ def root_collection(self):
+ return self.parent.root_collection()
+
+ def writable(self):
+ return self.root_collection().writable()
+
+ def _my_api(self):
+ return self.root_collection()._my_api()
+
+ def _my_keep(self):
+ return self.root_collection()._my_keep()
+
+ def _my_block_manager(self):
+ return self.root_collection()._my_block_manager()
+
+ def stream_name(self):
+ return os.path.join(self.parent.stream_name(), self.name)
+
+ @synchronized
+ def clone(self, new_parent, new_name):
+ c = Subcollection(new_parent, new_name)
+ c._clonefrom(self)
+ return c
+
+ @must_be_writable
+ @synchronized
+ def _reparent(self, newparent, newname):
+ self._committed = False
+ self.flush()
+ self.parent.remove(self.name, recursive=True)
+ self.parent = newparent
+ self.name = newname
+ self.lock = self.parent.root_collection().lock
+
+
+class CollectionReader(Collection):
+ """A read-only collection object.
+
+ Initialize from an api collection record locator, a portable data hash of a
+ manifest, or raw manifest text. See `Collection` constructor for detailed
+ options.
+
+ """
+ def __init__(self, manifest_locator_or_text, *args, **kwargs):
+ self._in_init = True
+ super(CollectionReader, self).__init__(manifest_locator_or_text, *args, **kwargs)
+ self._in_init = False
+
+ # Forego any locking since it should never change once initialized.
+ self.lock = NoopLock()
+
+ # Backwards compatability with old CollectionReader
+ # all_streams() and all_files()
+ self._streams = None
+
+ def writable(self):
+ return self._in_init
+
+ def _populate_streams(orig_func):
+ @functools.wraps(orig_func)
+ def populate_streams_wrapper(self, *args, **kwargs):
+ # Defer populating self._streams until needed since it creates a copy of the manifest.
+ if self._streams is None:
+ if self._manifest_text:
+ self._streams = [sline.split()
+ for sline in self._manifest_text.split("\n")
+ if sline]
+ else:
+ self._streams = []
+ return orig_func(self, *args, **kwargs)
+ return populate_streams_wrapper
+
+ @_populate_streams
+ def normalize(self):
+ """Normalize the streams returned by `all_streams`.
+
+ This method is kept for backwards compatability and only affects the
+ behavior of `all_streams()` and `all_files()`
+
+ """
+
+ # Rearrange streams
+ streams = {}
+ for s in self.all_streams():
+ for f in s.all_files():
+ streamname, filename = split(s.name() + "/" + f.name())
+ if streamname not in streams:
+ streams[streamname] = {}
+ if filename not in streams[streamname]:
+ streams[streamname][filename] = []
+ for r in f.segments:
+ streams[streamname][filename].extend(s.locators_and_ranges(r.locator, r.range_size))
+
+ self._streams = [normalize_stream(s, streams[s])
+ for s in sorted(streams)]
+ @_populate_streams
+ def all_streams(self):
+ return [StreamReader(s, self._my_keep(), num_retries=self.num_retries)
+ for s in self._streams]
+
+ @_populate_streams
+ def all_files(self):
+ for s in self.all_streams():
+ for f in s.all_files():
+ yield f
projects / arvados.git / blobdiff