import os
import re
import errno
+import hashlib
+import time
+import threading
from collections import deque
from stat import *
-from .arvfile import ArvadosFileBase, split, ArvadosFile, ArvadosFileWriter, ArvadosFileReader, BlockManager
-from keep import *
-from .stream import StreamReader, normalize_stream, locator_block_size
-from .ranges import Range, LocatorAndRange
+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')
return self._keep_client
def stripped_manifest(self):
- """
+ """Get the manifest with locator hints stripped.
+
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.
return ''.join(clean)
-class CollectionReader(CollectionBase):
- def __init__(self, manifest_locator_or_text, api_client=None,
- keep_client=None, num_retries=0):
- """Instantiate a CollectionReader.
-
- This class parses Collection manifests to provide a simple interface
- to read its underlying files.
-
- Arguments:
- * manifest_locator_or_text: One of a Collection UUID, portable data
- hash, or full manifest text.
- * api_client: The API client to use to look up Collections. If not
- provided, CollectionReader will build one from available Arvados
- configuration.
- * keep_client: The KeepClient to use to download Collection data.
- 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.
- """
- self._api_client = api_client
- self._keep_client = keep_client
- self.num_retries = num_retries
- if re.match(util.keep_locator_pattern, manifest_locator_or_text):
- self._manifest_locator = manifest_locator_or_text
- self._manifest_text = None
- elif re.match(util.collection_uuid_pattern, manifest_locator_or_text):
- self._manifest_locator = manifest_locator_or_text
- self._manifest_text = None
- elif re.match(util.manifest_pattern, manifest_locator_or_text):
- 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._api_response = None
- self._streams = None
-
- 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:
- if self._api_client is None:
- self._api_client = arvados.api('v1')
- self._keep_client = None # Make a new one with the new api.
- self._api_response = self._api_client.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):
- 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 arvados.errors.NotFoundError(
- ("Failed to retrieve collection '{}' " +
- "from either API server ({}) or Keep ({})."
- ).format(
- self._manifest_locator,
- error_via_api,
- error_via_keep))
- self._streams = [sline.split()
- for sline in self._manifest_text.split("\n")
- if sline]
-
- def _populate_first(orig_func):
- # Decorator for methods that read actual Collection data.
- @functools.wraps(orig_func)
- def wrapper(self, *args, **kwargs):
- if self._streams is None:
- self._populate()
- return orig_func(self, *args, **kwargs)
- return wrapper
-
- @_populate_first
- def api_response(self):
- """api_response() -> dict or None
-
- 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
-
- @_populate_first
- def normalize(self):
- # 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)]
-
- # Regenerate the manifest text based on the normalized streams
- self._manifest_text = ''.join(
- [StreamReader(stream, keep=self._my_keep()).manifest_text()
- for stream in self._streams])
-
- @_populate_first
- def open(self, streampath, filename=None):
- """open(streampath[, filename]) -> file-like object
-
- Pass in the path of a file to read from the Collection, either as a
- single string or as two separate stream name and file name arguments.
- This method returns a file-like object to read that file.
- """
- if filename is None:
- streampath, filename = split(streampath)
- keep_client = self._my_keep()
- for stream_s in self._streams:
- stream = StreamReader(stream_s, keep_client,
- num_retries=self.num_retries)
- if stream.name() == streampath:
- break
- else:
- raise ValueError("stream '{}' not found in Collection".
- format(streampath))
- try:
- return stream.files()[filename]
- except KeyError:
- raise ValueError("file '{}' not found in Collection stream '{}'".
- format(filename, streampath))
-
- @_populate_first
- def all_streams(self):
- return [StreamReader(s, self._my_keep(), num_retries=self.num_retries)
- for s in self._streams]
-
- def all_files(self):
- for s in self.all_streams():
- for f in s.all_files():
- yield f
-
- @_populate_first
- def manifest_text(self, strip=False, normalize=False):
- if normalize:
- cr = CollectionReader(self.manifest_text())
- cr.normalize()
- return cr.manifest_text(strip=strip, normalize=False)
- elif strip:
- return self.stripped_manifest()
- else:
- return self._manifest_text
-
-
-class _WriterFile(ArvadosFileBase):
+class _WriterFile(_FileLikeObjectBase):
def __init__(self, coll_writer, name):
super(_WriterFile, self).__init__(name, 'wb')
self.dest = coll_writer
super(_WriterFile, self).close()
self.dest.finish_current_file()
- @ArvadosFileBase._before_close
+ @_FileLikeObjectBase._before_close
def write(self, data):
self.dest.write(data)
- @ArvadosFileBase._before_close
+ @_FileLikeObjectBase._before_close
def writelines(self, seq):
for data in seq:
self.write(data)
- @ArvadosFileBase._before_close
+ @_FileLikeObjectBase._before_close
def flush(self):
self.dest.flush_data()
class CollectionWriter(CollectionBase):
- def __init__(self, api_client=None, num_retries=0):
+ def __init__(self, api_client=None, num_retries=0, replication=None):
"""Instantiate a CollectionWriter.
CollectionWriter lets you build a new Arvados Collection from scratch.
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
data_buffer = ''.join(self._data_buffer)
if data_buffer:
self._current_stream_locators.append(
- self._my_keep().put(data_buffer[0:config.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])
self._current_file_name = None
def finish(self):
- # Store the manifest in Keep and return its locator.
- return self._my_keep().put(self.manifest_text())
+ """Store the manifest in Keep and return its locator.
+
+ 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.
+ """
+ return self._my_keep().put(self.manifest_text(), copies=self.replication)
def portable_data_hash(self):
stripped = self.stripped_manifest()
'_data_buffer', '_dependencies', '_finished_streams',
'_queued_dirents', '_queued_trees']
- def __init__(self, api_client=None, num_retries=0):
+ def __init__(self, api_client=None, **kwargs):
self._dependencies = {}
- super(ResumableCollectionWriter, self).__init__(
- api_client, num_retries=num_retries)
+ super(ResumableCollectionWriter, self).__init__(api_client, **kwargs)
@classmethod
def from_state(cls, state, *init_args, **init_kwargs):
return super(ResumableCollectionWriter, self).write(data)
-class Collection(CollectionBase):
- '''An abstract Arvados collection, consisting of a set of files and
- sub-collections.
- '''
+ADD = "add"
+DEL = "del"
+MOD = "mod"
+FILE = "file"
+COLLECTION = "collection"
- def __init__(self, manifest_locator_or_text=None, parent=None, api_client=None,
- keep_client=None, num_retries=0, block_manager=None):
- '''manifest_locator_or_text: One of Arvados collection UUID, block locator of
- a manifest, raw manifest text, or None (to create an empty collection).
+class RichCollectionBase(CollectionBase):
+ """Base class for Collections and Subcollections.
- parent: the parent Collection, may be None.
+ Implements the majority of functionality relating to accessing items in the
+ Collection.
- api_client: The API client object to use for requests. If None, use default.
+ """
- keep_client: the Keep client to use for requests. If None, use default.
+ def __init__(self, parent=None):
+ self.parent = parent
+ self._committed = False
+ self._callback = None
+ self._items = {}
- num_retries: the number of retries for API and Keep requests.
+ def _my_api(self):
+ raise NotImplementedError()
- block_manager: the block manager to use. If None, create one.
- '''
- self.parent = parent
- self._items = None
+ 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
- self.num_retries = num_retries
+ 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_text = manifest_locator_or_text
else:
raise errors.ArgumentError(
- "Argument to CollectionReader must be a manifest or a collection UUID")
+ "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:
- if self.parent is not None:
- return self.parent._my_api()
- self._api_client = arvados.api('v1')
- self._keep_client = None # Make a new one with the new api.
+ 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.parent is not None:
- return self.parent._my_keep()
- self._keep_client = KeepClient(api_client=self._my_api(),
- num_retries=self.num_retries)
+ 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:
- if self.parent is not None:
- return self.parent._my_block_manager()
- self._block_manager = BlockManager(self._my_keep())
+ 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
# clause, just like any other Collection lookup
# failure. Return an exception, or None if successful.
try:
- self._api_response = self._my_api().collections().get(
+ self._remember_api_response(self._my_api().collections().get(
uuid=self._manifest_locator).execute(
- num_retries=self.num_retries)
+ num_retries=self.num_retries))
self._manifest_text = self._api_response['manifest_text']
return None
except Exception as e:
return e
def _populate(self):
- self._items = {}
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))
+ 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()
error_via_keep = self._populate_from_keep()
if self._manifest_text is None:
# Nothing worked!
- raise arvados.errors.NotFoundError(
+ raise errors.NotFoundError(
("Failed to retrieve collection '{}' " +
"from either API server ({}) or Keep ({})."
).format(
error_via_api,
error_via_keep))
# populate
- import_manifest(self._manifest_text, self)
+ self._baseline_manifest = self._manifest_text
+ self._import_manifest(self._manifest_text)
- def _populate_first(orig_func):
- # Decorator for methods that read actual Collection data.
- @functools.wraps(orig_func)
- def wrapper(self, *args, **kwargs):
- if self._items is None:
- self._populate()
- return orig_func(self, *args, **kwargs)
- return wrapper
+
+ 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'''
- self.save(no_locator=True)
+ """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()
- @_populate_first
- def find(self, path, create=False, create_collection=False):
- '''Recursively search the specified file path. May return either a Collection
- or ArvadosFile.
+ @synchronized
+ def manifest_locator(self):
+ """Get the manifest locator, if any.
- create: If true, create path components (i.e. Collections) that are
- missing. If "create" is False, return None if a path component is not
- found.
+ The manifest locator will be set when the collection is loaded from an
+ API server record or the portable data hash of a manifest.
- create_collection: If the path is not found, "create" is True, and
- "create_collection" is False, then create and return a new ArvadosFile
- for the last path component. If "create_collection" is True, then
- create and return a new Collection for the last path component.
- '''
- p = path.split("/")
- if p[0] == '.':
- del p[0]
-
- if len(p) > 0:
- item = self._items.get(p[0])
- if len(p) == 1:
- # item must be a file
- if item is None and create:
- # create new file
- if create_collection:
- item = Collection(parent=self, num_retries=self.num_retries)
- else:
- item = ArvadosFile(self)
- self._items[p[0]] = item
- return item
- else:
- if item is None and create:
- # create new collection
- item = Collection(parent=self, num_retries=self.num_retries)
- self._items[p[0]] = item
- del p[0]
- return item.find("/".join(p), create=create)
+ 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:
- return self
+ newcollection = Collection(parent=new_parent, apiconfig=new_config)
- @_populate_first
+ newcollection._clonefrom(self)
+ return newcollection
+
+ @synchronized
def api_response(self):
- """api_response() -> dict or None
+ """Returns information about this Collection fetched from the API server.
- 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 open(self, path, mode):
- '''Open a file-like object for access.
+ 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)
- path: path to a file in the collection
+ def find(self, path):
+ """See `RichCollectionBase.find`"""
+ if path == ".":
+ return self
+ else:
+ return super(Collection, self).find(path[2:] if path.startswith("./") else path)
- mode: one of "r", "r+", "w", "w+", "a", "a+"
- "r" opens for reading
+ 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)
- "r+" opens for reading and writing. Reads/writes share a file pointer.
+ @must_be_writable
+ @synchronized
+ @retry_method
+ def save(self, merge=True, num_retries=None):
+ """Save collection to an existing collection record.
- "w", "w+" truncates to 0 and opens for reading and writing. Reads/writes share a file pointer.
+ 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.
- "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 ArgumentError("Bad mode '%s'" % mode)
- create = (mode != "r")
+ 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()`.
- f = self.find(path, create=create)
- if f is None:
- raise IOError((errno.ENOENT, "File not found"))
- if not isinstance(f, ArvadosFile):
- raise IOError((errno.EISDIR, "Path must refer to a file."))
+ :merge:
+ Update and merge remote changes before saving. Otherwise, any
+ remote changes will be ignored and overwritten.
- if mode[0] == "w":
- f.truncate(0)
+ :num_retries:
+ Retry count on API calls (if None, use the collection default)
- if mode == "r":
- return ArvadosFileReader(f, path, mode)
- else:
- return ArvadosFileWriter(f, path, mode)
+ """
+ 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.")
- @_populate_first
- def modified(self):
- '''Test if the collection (or any subcollection or file) has been modified
- since it was created.'''
- for k,v in self._items.items():
- if v.modified():
- return True
- return False
+ self._my_block_manager().commit_all()
- @_populate_first
- def set_unmodified(self):
- '''Recursively clear modified flag'''
- for k,v in self._items.items():
- v.set_unmodified()
+ if merge:
+ self.update()
- @_populate_first
- def __iter__(self):
- '''Iterate over names of files and collections contained in this collection.'''
- return self._items.iterkeys()
+ 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()
- @_populate_first
- def iterkeys(self):
- '''Iterate over names of files and collections directly contained in this collection.'''
- return self._items.iterkeys()
+ return self._manifest_text
- @_populate_first
- def __getitem__(self, k):
- '''Get a file or collection that is directly contained by this collection. Use
- find() for path serach.'''
- return self._items[k]
- @_populate_first
- def __contains__(self, k):
- '''If there is a file or collection a directly contained by this collection
- with name "k".'''
- return k in self._items
+ @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.
- @_populate_first
- def __len__(self):
- '''Get the number of items directly contained in this collection'''
- return len(self._items)
+ 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.
- @_populate_first
- def __delitem__(self, p):
- '''Delete an item by name which is directly contained by this collection.'''
- del self._items[p]
+ :name:
+ The collection name.
- @_populate_first
- def keys(self):
- '''Get a list of names of files and collections directly contained in this collection.'''
- return self._items.keys()
+ :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.
- @_populate_first
- def values(self):
- '''Get a list of files and collection objects directly contained in this collection.'''
- return self._items.values()
+ :owner_uuid:
+ the user, or project uuid that will own this collection.
+ If None, defaults to the current user.
- @_populate_first
- def items(self):
- '''Get a list of (name, object) tuples directly contained in this collection.'''
- return self._items.items()
+ :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.
- @_populate_first
- def exists(self, path):
- '''Test if there is a file or collection at "path"'''
- return self.find(path) != None
-
- @_populate_first
- def remove(self, path):
- '''Test if there is a file or collection at "path"'''
- p = path.split("/")
- if p[0] == '.':
- del p[0]
-
- if len(p) > 0:
- item = self._items.get(p[0])
- if item is None:
- raise IOError((errno.ENOENT, "File not found"))
- if len(p) == 1:
- del self._items[p[0]]
- else:
- del p[0]
- item.remove("/".join(p))
- else:
- raise IOError((errno.ENOENT, "File not found"))
-
- @_populate_first
- def manifest_text(self, strip=False, normalize=False):
- '''Get the manifest text for this collection, sub collections and files.
-
- strip: If True, remove signing tokens from block locators if present.
- If False, 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 and the collection is
- not modified, return the original manifest text even if it is not in
- normalized form.
- '''
- if self.modified() or self._manifest_text is None or normalize:
- return export_manifest(self, stream_name=".", portable_locators=strip)
- else:
- if strip:
- return self.stripped_manifest()
- else:
- return self._manifest_text
+ :num_retries:
+ Retry count on API calls (if None, use the collection default)
- def portable_data_hash(self):
- '''Get the portable data hash for this collection's manifest.'''
- stripped = self.manifest_text(strip=True)
- return hashlib.md5(stripped).hexdigest() + '+' + str(len(stripped))
+ """
+ self._my_block_manager().commit_all()
+ text = self.manifest_text(strip=False)
- @_populate_first
- def save(self, no_locator=False):
- '''Commit pending buffer blocks to Keep, write the manifest to Keep, and
- update the collection record to Keep.
+ if create_collection_record:
+ if name is None:
+ name = "New collection"
+ ensure_unique_name = True
- no_locator: If False and there is no collection uuid associated with
- this Collection, raise an error. If True, do not raise an error.
- '''
- if self.modified():
- self._my_block_manager().commit_all()
- self._my_keep().put(self.manifest_text(strip=True))
- if self._manifest_locator is not None and re.match(util.collection_uuid_pattern, self._manifest_locator):
- self._api_response = self._my_api().collections().update(
- uuid=self._manifest_locator,
- body={'manifest_text': self.manifest_text(strip=False)}
- ).execute(
- num_retries=self.num_retries)
- elif not no_locator:
- raise AssertionError("Collection manifest_locator must be a collection uuid. Use save_as() for new collections.")
- self.set_unmodified()
-
- @_populate_first
- def save_as(self, name, owner_uuid=None, ensure_unique_name=False):
- '''Save a new collection record.
-
- name: The collection name.
-
- 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.
- '''
- self._my_block_manager().commit_all()
- self._my_keep().put(self.manifest_text(strip=True))
- body = {"manifest_text": self.manifest_text(strip=False),
- "name": name}
- if owner_uuid:
- body["owner_uuid"] = owner_uuid
- self._api_response = self._my_api().collections().create(ensure_unique_name=ensure_unique_name, body=body).execute(num_retries=self.num_retries)
- self._manifest_locator = self._api_response["uuid"]
- self.set_unmodified()
+ 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"]
-def import_manifest(manifest_text, into_collection=None, api_client=None, keep=None, num_retries=None):
- '''Import a manifest into a Collection.
+ self._manifest_locator = self._api_response["uuid"]
- manifest_text: The manifest text to import from.
+ self._manifest_text = text
+ self.set_committed()
- into_collection: The Collection that will be initialized (must be empty).
- If None, create a new Collection object.
+ return text
- api_client: The API client object that will be used when creating a new Collection object.
+ @synchronized
+ def _import_manifest(self, manifest_text):
+ """Import a manifest into a `Collection`.
- keep: The keep client object that will be used when creating a new Collection object.
+ :manifest_text:
+ The manifest text to import from.
- num_retries: the default number of api client and keep retries on error.
- '''
- if into_collection is not None:
- if len(into_collection) > 0:
+ """
+ if len(self) > 0:
raise ArgumentError("Can only import manifest into an empty collection")
- c = into_collection
- else:
- c = Collection(api_client=api_client, keep_client=keep, num_retries=num_retries)
-
- STREAM_NAME = 0
- BLOCKS = 1
- SEGMENTS = 2
-
- stream_name = None
- state = STREAM_NAME
-
- for n in re.finditer(r'(\S+)(\s+|$)', manifest_text):
- tok = n.group(1)
- sep = n.group(2)
-
- if state == STREAM_NAME:
- # starting a new stream
- stream_name = tok.replace('\\040', ' ')
- blocks = []
- segments = []
- streamoffset = 0L
- state = BLOCKS
- continue
-
- if state == BLOCKS:
- s = re.match(r'[0-9a-f]{32}\+(\d+)(\+\S+)*', tok)
- if s:
- blocksize = long(s.group(1))
- blocks.append(Range(tok, streamoffset, blocksize))
- streamoffset += blocksize
- else:
- state = SEGMENTS
-
- if state == SEGMENTS:
- s = re.search(r'^(\d+):(\d+):(\S+)', tok)
- if s:
- pos = long(s.group(1))
- size = long(s.group(2))
- name = s.group(3).replace('\\040', ' ')
- f = c.find("%s/%s" % (stream_name, name), create=True)
- f.add_segment(blocks, pos, size)
- else:
- # error!
- raise errors.SyntaxError("Invalid manifest format")
-
- if sep == "\n":
- stream_name = None
- state = STREAM_NAME
-
- c.set_unmodified()
- return c
-
-def export_manifest(item, stream_name=".", portable_locators=False):
- '''Create a manifest for "item" (must be a Collection or ArvadosFile). If
- "item" is a is a Collection, this will also export subcollections.
-
- stream_name: the name of the stream when exporting "item".
-
- portable_locators: If True, strip any permission hints on block locators.
- If False, use block locators as-is.
- '''
- buf = ""
- if isinstance(item, Collection):
- stream = {}
- sorted_keys = sorted(item.keys())
- for k in [s for s in sorted_keys if isinstance(item[s], ArvadosFile)]:
- v = item[k]
- st = []
- for s in v.segments:
- loc = s.locator
- if loc.startswith("bufferblock"):
- loc = v.parent._my_block_manager()._bufferblocks[loc].locator()
- if portable_locators:
- loc = KeepLocator(loc).stripped()
- st.append(LocatorAndRange(loc, locator_block_size(loc),
- s.segment_offset, s.range_size))
- stream[k] = st
- if stream:
- buf += ' '.join(normalize_stream(stream_name, stream))
- buf += "\n"
- for k in [s for s in sorted_keys if isinstance(item[s], Collection)]:
- buf += export_manifest(item[k], stream_name=os.path.join(stream_name, k), portable_locators=portable_locators)
- elif isinstance(item, ArvadosFile):
- st = []
- for s in item.segments:
- loc = s.locator
- if loc.startswith("bufferblock"):
- loc = item._bufferblocks[loc].calculate_locator()
- if portable_locators:
- loc = KeepLocator(loc).stripped()
- st.append(LocatorAndRange(loc, locator_block_size(loc),
- s.segment_offset, s.range_size))
- stream[stream_name] = st
- buf += ' '.join(normalize_stream(stream_name, stream))
- buf += "\n"
- return buf
+
+ 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