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Source code for galaxy.objectstore.azure_blob

"""
Object Store plugin for the Microsoft Azure Block Blob Storage system
"""

import logging
import os
import shutil
import threading
import time

from datetime import datetime

from galaxy.exceptions import ObjectInvalid, ObjectNotFound
from galaxy.util import directory_hash_id, safe_relpath, umask_fix_perms
from galaxy.util.sleeper import Sleeper
from ..objectstore import convert_bytes, ObjectStore

try:
    from azure.common import AzureHttpError
    from azure.storage import CloudStorageAccount
    from azure.storage.blob import BlockBlobService
    from azure.storage.blob.models import Blob
except ImportError:
    BlockBlobService = None

NO_BLOBSERVICE_ERROR_MESSAGE = ("ObjectStore configured, but no azure.storage.blob dependency available."
                                "Please install and properly configure azure.storage.blob or modify Object Store configuration.")

log = logging.getLogger(__name__)


[docs]class AzureBlobObjectStore(ObjectStore): """ Object store that stores objects as blobs in an Azure Blob Container. A local cache exists that is used as an intermediate location for files between Galaxy and Azure. """
[docs] def __init__(self, config, config_xml): if BlockBlobService is None: raise Exception(NO_BLOBSERVICE_ERROR_MESSAGE) super(AzureBlobObjectStore, self).__init__(config) self.staging_path = self.config.file_path self.transfer_progress = 0 self._parse_config_xml(config_xml) self._configure_connection() # Clean cache only if value is set in galaxy.ini if self.cache_size != -1: # Convert GBs to bytes for comparison self.cache_size = self.cache_size * 1073741824 # Helper for interruptable sleep self.sleeper = Sleeper() self.cache_monitor_thread = threading.Thread(target=self.__cache_monitor) self.cache_monitor_thread.start() log.info("Cache cleaner manager started")
################### # Private Methods # ################### # config_xml is an ElementTree object. def _parse_config_xml(self, config_xml): try: auth_xml = config_xml.find('auth') self.account_name = auth_xml.get('account_name') self.account_key = auth_xml.get('account_key') container_xml = config_xml.find('container') self.container_name = container_xml.get('name') self.max_chunk_size = int(container_xml.get('max_chunk_size', 250)) # currently unused cache_xml = config_xml.find('cache') self.cache_size = float(cache_xml.get('size', -1)) self.staging_path = cache_xml.get('path', self.config.object_store_cache_path) for d_xml in config_xml.findall('extra_dir'): self.extra_dirs[d_xml.get('type')] = d_xml.get('path') log.debug("Object cache dir: %s", self.staging_path) log.debug(" job work dir: %s", self.extra_dirs['job_work']) except Exception: # Toss it back up after logging, we can't continue loading at this point. log.exception("Malformed ObjectStore Configuration XML -- unable to continue") raise def _configure_connection(self): log.debug("Configuring Connection") self.account = CloudStorageAccount(self.account_name, self.account_key) self.service = self.account.create_block_blob_service() def _construct_path(self, obj, base_dir=None, dir_only=None, extra_dir=None, extra_dir_at_root=False, alt_name=None, obj_dir=False, **kwargs): # extra_dir should never be constructed from provided data but just # make sure there are no shenannigans afoot if extra_dir and extra_dir != os.path.normpath(extra_dir): log.warning('extra_dir is not normalized: %s', extra_dir) raise ObjectInvalid("The requested object is invalid") # ensure that any parent directory references in alt_name would not # result in a path not contained in the directory path constructed here if alt_name: if not safe_relpath(alt_name): log.warning('alt_name would locate path outside dir: %s', alt_name) raise ObjectInvalid("The requested object is invalid") # alt_name can contain parent directory references, but S3 will not # follow them, so if they are valid we normalize them out alt_name = os.path.normpath(alt_name) rel_path = os.path.join(*directory_hash_id(obj.id)) if extra_dir is not None: if extra_dir_at_root: rel_path = os.path.join(extra_dir, rel_path) else: rel_path = os.path.join(rel_path, extra_dir) # for JOB_WORK directory if obj_dir: rel_path = os.path.join(rel_path, str(obj.id)) if base_dir: base = self.extra_dirs.get(base_dir) return os.path.join(base, rel_path) # S3 folders are marked by having trailing '/' so add it now # rel_path = '%s/' % rel_path # assume for now we don't need this in Azure blob storage. if not dir_only: rel_path = os.path.join(rel_path, alt_name if alt_name else "dataset_%s.dat" % obj.id) return rel_path def _fix_permissions(self, rel_path): """ Set permissions on rel_path""" for basedir, _, files in os.walk(rel_path): umask_fix_perms(basedir, self.config.umask, 0o777, self.config.gid) for filename in files: path = os.path.join(basedir, filename) # Ignore symlinks if os.path.islink(path): continue umask_fix_perms(path, self.config.umask, 0o666, self.config.gid) def _get_cache_path(self, rel_path): return os.path.abspath(os.path.join(self.staging_path, rel_path)) def _get_transfer_progress(self): return self.transfer_progress def _get_size_in_azure(self, rel_path): try: properties = self.service.get_blob_properties(self.container_name, rel_path) # Currently this returns a blob and not a BlobProperties object # Similar issue for the ruby https://github.com/Azure/azure-storage-ruby/issues/13 # The typecheck is an attempt at future-proofing this when/if the bug is fixed. if type(properties) is Blob: properties = properties.properties if properties: size_in_bytes = properties.content_length return size_in_bytes except AzureHttpError: log.exception("Could not get size of blob '%s' from Azure", rel_path) return -1 def _in_azure(self, rel_path): try: exists = self.service.exists(self.container_name, rel_path) except AzureHttpError: log.exception("Trouble checking existence of Azure blob '%s'", rel_path) return False return exists def _in_cache(self, rel_path): """ Check if the given dataset is in the local cache. """ cache_path = self._get_cache_path(rel_path) return os.path.exists(cache_path) def _pull_into_cache(self, rel_path): # Ensure the cache directory structure exists (e.g., dataset_#_files/) rel_path_dir = os.path.dirname(rel_path) if not os.path.exists(self._get_cache_path(rel_path_dir)): os.makedirs(self._get_cache_path(rel_path_dir)) # Now pull in the file file_ok = self._download(rel_path) self._fix_permissions(self._get_cache_path(rel_path_dir)) return file_ok def _transfer_cb(self, complete, total): self.transfer_progress = float(complete) / float(total) * 100 # in percent def _download(self, rel_path): local_destination = self._get_cache_path(rel_path) try: log.debug("Pulling '%s' into cache to %s", rel_path, local_destination) if self.cache_size > 0 and self._get_size_in_azure(rel_path) > self.cache_size: log.critical("File %s is larger (%s) than the cache size (%s). Cannot download.", rel_path, self._get_size_in_azure(rel_path), self.cache_size) return False else: self.transfer_progress = 0 # Reset transfer progress counter self.service.get_blob_to_path(self.container_name, rel_path, local_destination, progress_callback=self._transfer_cb) return True except AzureHttpError: log.exception("Problem downloading '%s' from Azure", rel_path) return False def _push_to_os(self, rel_path, source_file=None, from_string=None): """ Push the file pointed to by ``rel_path`` to the object store naming the blob ``rel_path``. If ``source_file`` is provided, push that file instead while still using ``rel_path`` as the blob name. If ``from_string`` is provided, set contents of the file to the value of the string. """ try: source_file = source_file or self._get_cache_path(rel_path) if not os.path.exists(source_file): log.error("Tried updating blob '%s' from source file '%s', but source file does not exist.", rel_path, source_file) return False if os.path.getsize(source_file) == 0: log.debug("Wanted to push file '%s' to azure blob '%s' but its size is 0; skipping.", source_file, rel_path) return True if from_string: self.service.create_blob_from_text(self.container_name, rel_path, from_string, progress_callback=self._transfer_cb) log.debug("Pushed data from string '%s' to blob '%s'", from_string, rel_path) else: start_time = datetime.now() log.debug("Pushing cache file '%s' of size %s bytes to '%s'", source_file, os.path.getsize(source_file), rel_path) self.transfer_progress = 0 # Reset transfer progress counter self.service.create_blob_from_path(self.container_name, rel_path, source_file, progress_callback=self._transfer_cb) end_time = datetime.now() log.debug("Pushed cache file '%s' to blob '%s' (%s bytes transfered in %s sec)", source_file, rel_path, os.path.getsize(source_file), end_time - start_time) return True except AzureHttpError: log.exception("Trouble pushing to Azure Blob '%s' from file '%s'", rel_path, source_file) return False ################## # Public Methods # ##################
[docs] def exists(self, obj, **kwargs): in_cache = in_azure = False rel_path = self._construct_path(obj, **kwargs) in_cache = self._in_cache(rel_path) in_azure = self._in_azure(rel_path) # log.debug("~~~~~~ File '%s' exists in cache: %s; in azure: %s" % (rel_path, in_cache, in_azure)) # dir_only does not get synced so shortcut the decision dir_only = kwargs.get('dir_only', False) base_dir = kwargs.get('base_dir', None) if dir_only: if in_cache or in_azure: return True # for JOB_WORK directory elif base_dir: if not os.path.exists(rel_path): os.makedirs(rel_path) return True else: return False # TODO: Sync should probably not be done here. Add this to an async upload stack? if in_cache and not in_azure: self._push_to_os(rel_path, source_file=self._get_cache_path(rel_path)) return True elif in_azure: return True else: return False
[docs] def file_ready(self, obj, **kwargs): """ A helper method that checks if a file corresponding to a dataset is ready and available to be used. Return ``True`` if so, ``False`` otherwise. """ rel_path = self._construct_path(obj, **kwargs) # Make sure the size in cache is available in its entirety if self._in_cache(rel_path): local_size = os.path.getsize(self._get_cache_path(rel_path)) remote_size = self._get_size_in_azure(rel_path) if local_size == remote_size: return True else: log.debug("Waiting for dataset %s to transfer from OS: %s/%s", rel_path, local_size, remote_size) return False
[docs] def create(self, obj, **kwargs): if not self.exists(obj, **kwargs): # Pull out locally used fields extra_dir = kwargs.get('extra_dir', None) extra_dir_at_root = kwargs.get('extra_dir_at_root', False) dir_only = kwargs.get('dir_only', False) alt_name = kwargs.get('alt_name', None) # Construct hashed path rel_path = os.path.join(*directory_hash_id(obj.id)) # Optionally append extra_dir if extra_dir is not None: if extra_dir_at_root: rel_path = os.path.join(extra_dir, rel_path) else: rel_path = os.path.join(rel_path, extra_dir) # Create given directory in cache cache_dir = os.path.join(self.staging_path, rel_path) if not os.path.exists(cache_dir): os.makedirs(cache_dir) # Although not really necessary to create S3 folders (because S3 has # flat namespace), do so for consistency with the regular file system # S3 folders are marked by having trailing '/' so add it now # s3_dir = '%s/' % rel_path # self._push_to_os(s3_dir, from_string='') # If instructed, create the dataset in cache & in S3 if not dir_only: rel_path = os.path.join(rel_path, alt_name if alt_name else "dataset_%s.dat" % obj.id) open(os.path.join(self.staging_path, rel_path), 'w').close() self._push_to_os(rel_path, from_string='')
[docs] def empty(self, obj, **kwargs): if self.exists(obj, **kwargs): return bool(self.size(obj, **kwargs) > 0) else: raise ObjectNotFound('objectstore.empty, object does not exist: %s, kwargs: %s' % (str(obj), str(kwargs)))
[docs] def size(self, obj, **kwargs): rel_path = self._construct_path(obj, **kwargs) if self._in_cache(rel_path): try: return os.path.getsize(self._get_cache_path(rel_path)) except OSError as ex: log.info("Could not get size of file '%s' in local cache, will try Azure. Error: %s", rel_path, ex) elif self.exists(obj, **kwargs): return self._get_size_in_azure(rel_path) log.warning("Did not find dataset '%s', returning 0 for size", rel_path) return 0
[docs] def delete(self, obj, entire_dir=False, **kwargs): rel_path = self._construct_path(obj, **kwargs) extra_dir = kwargs.get('extra_dir', None) base_dir = kwargs.get('base_dir', None) dir_only = kwargs.get('dir_only', False) obj_dir = kwargs.get('obj_dir', False) try: if base_dir and dir_only and obj_dir: # Remove temporary data in JOB_WORK directory shutil.rmtree(os.path.abspath(rel_path)) return True # For the case of extra_files, because we don't have a reference to # individual files/blobs we need to remove the entire directory structure # with all the files in it. This is easy for the local file system, # but requires iterating through each individual blob in Azure and deleing it. if entire_dir and extra_dir: shutil.rmtree(self._get_cache_path(rel_path)) blobs = self.service.list_blobs(self.container_name, prefix=rel_path) for blob in blobs: log.debug("Deleting from Azure: %s", blob) self.service.delete_blob(self.container_name, blob.name) return True else: # Delete from cache first os.unlink(self._get_cache_path(rel_path)) # Delete from S3 as well if self._in_azure(rel_path): log.debug("Deleting from Azure: %s", rel_path) self.service.delete_blob(self.container_name, rel_path) return True except AzureHttpError: log.exception("Could not delete blob '%s' from Azure", rel_path) except OSError: log.exception('%s delete error', self.get_filename(obj, **kwargs)) return False
[docs] def get_data(self, obj, start=0, count=-1, **kwargs): rel_path = self._construct_path(obj, **kwargs) # Check cache first and get file if not there if not self._in_cache(rel_path): self._pull_into_cache(rel_path) # Read the file content from cache data_file = open(self._get_cache_path(rel_path), 'r') data_file.seek(start) content = data_file.read(count) data_file.close() return content
[docs] def get_filename(self, obj, **kwargs): rel_path = self._construct_path(obj, **kwargs) base_dir = kwargs.get('base_dir', None) dir_only = kwargs.get('dir_only', False) obj_dir = kwargs.get('obj_dir', False) # for JOB_WORK directory if base_dir and dir_only and obj_dir: return os.path.abspath(rel_path) cache_path = self._get_cache_path(rel_path) # S3 does not recognize directories as files so cannot check if those exist. # So, if checking dir only, ensure given dir exists in cache and return # the expected cache path. # dir_only = kwargs.get('dir_only', False) # if dir_only: # if not os.path.exists(cache_path): # os.makedirs(cache_path) # return cache_path # Check if the file exists in the cache first if self._in_cache(rel_path): return cache_path # Check if the file exists in persistent storage and, if it does, pull it into cache elif self.exists(obj, **kwargs): if dir_only: # Directories do not get pulled into cache return cache_path else: if self._pull_into_cache(rel_path): return cache_path # For the case of retrieving a directory only, return the expected path # even if it does not exist. # if dir_only: # return cache_path raise ObjectNotFound('objectstore.get_filename, no cache_path: %s, kwargs: %s' % (str(obj), str(kwargs)))
[docs] def update_from_file(self, obj, file_name=None, create=False, **kwargs): if create is True: self.create(obj, **kwargs) elif self.exists(obj, **kwargs): rel_path = self._construct_path(obj, **kwargs) # Chose whether to use the dataset file itself or an alternate file if file_name: source_file = os.path.abspath(file_name) # Copy into cache cache_file = self._get_cache_path(rel_path) try: if source_file != cache_file: # FIXME? Should this be a `move`? shutil.copy2(source_file, cache_file) self._fix_permissions(cache_file) except OSError: log.exception("Trouble copying source file '%s' to cache '%s'", source_file, cache_file) else: source_file = self._get_cache_path(rel_path) self._push_to_os(rel_path, source_file) else: raise ObjectNotFound('objectstore.update_from_file, object does not exist: %s, kwargs: %s' % (str(obj), str(kwargs)))
[docs] def get_object_url(self, obj, **kwargs): if self.exists(obj, **kwargs): rel_path = self._construct_path(obj, **kwargs) try: url = self.service.make_blob_url(container_name=self.container_name, blob_name=rel_path) return url except AzureHttpError: log.exception("Trouble generating URL for dataset '%s'", rel_path) return None
[docs] def get_store_usage_percent(self): return 0.0
################## # Secret Methods # ################## def __cache_monitor(self): time.sleep(2) # Wait for things to load before starting the monitor while self.running: total_size = 0 # Is this going to be too expensive of an operation to be done frequently? file_list = [] for dirpath, _, filenames in os.walk(self.staging_path): for filename in filenames: filepath = os.path.join(dirpath, filename) file_size = os.path.getsize(filepath) total_size += file_size # Get the time given file was last accessed last_access_time = time.localtime(os.stat(filepath)[7]) # Compose a tuple of the access time and the file path file_tuple = last_access_time, filepath, file_size file_list.append(file_tuple) # Sort the file list (based on access time) file_list.sort() # Initiate cleaning once within 10% of the defined cache size? cache_limit = self.cache_size * 0.9 if total_size > cache_limit: log.info("Initiating cache cleaning: current cache size: %s; clean until smaller than: %s", convert_bytes(total_size), convert_bytes(cache_limit)) # How much to delete? If simply deleting up to the cache-10% limit, # is likely to be deleting frequently and may run the risk of hitting # the limit - maybe delete additional #%? # For now, delete enough to leave at least 10% of the total cache free delete_this_much = total_size - cache_limit # Keep deleting datasets from file_list until deleted_amount does not # exceed delete_this_much; start deleting from the front of the file list, # which assumes the oldest files come first on the list. deleted_amount = 0 for entry in enumerate(file_list): if deleted_amount < delete_this_much: deleted_amount += entry[2] os.remove(entry[1]) # Debugging code for printing deleted files' stats # folder, file_name = os.path.split(f[1]) # file_date = time.strftime("%m/%d/%y %H:%M:%S", f[0]) # log.debug("%s. %-25s %s, size %s (deleted %s/%s)" \ # % (i, file_name, convert_bytes(f[2]), file_date, \ # convert_bytes(deleted_amount), convert_bytes(delete_this_much))) else: log.debug("Cache cleaning done. Total space freed: %s", convert_bytes(deleted_amount)) self.sleeper.sleep(30) # Test cache size every 30 seconds?