84 lines
3.4 KiB
Python
84 lines
3.4 KiB
Python
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import random
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import logging
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from functools import wraps
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from storage.basestorage import StoragePaths, BaseStorage, BaseStorageV2
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logger = logging.getLogger(__name__)
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def _location_aware(unbound_func, requires_write=False):
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@wraps(unbound_func)
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def wrapper(self, locations, *args, **kwargs):
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if requires_write:
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assert not self.readonly_mode
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storage = None
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for preferred in self.preferred_locations:
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if preferred in locations:
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storage = self._storages[preferred]
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break
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if not storage:
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storage = self._storages[random.sample(locations, 1)[0]]
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storage_func = getattr(storage, unbound_func.__name__)
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return storage_func(*args, **kwargs)
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return wrapper
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class DistributedStorage(StoragePaths):
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def __init__(self, storages, preferred_locations=None, default_locations=None, proxy=None,
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readonly_mode=False):
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self._storages = dict(storages)
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self.preferred_locations = list(preferred_locations or [])
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self.default_locations = list(default_locations or [])
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self.proxy = proxy
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self.readonly_mode = readonly_mode
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@property
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def locations(self):
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""" Returns the names of the locations supported. """
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return list(self._storages.keys())
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_get_direct_download_url = _location_aware(BaseStorage.get_direct_download_url)
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get_direct_upload_url = _location_aware(BaseStorage.get_direct_upload_url)
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get_content = _location_aware(BaseStorage.get_content)
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put_content = _location_aware(BaseStorage.put_content, requires_write=True)
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stream_read = _location_aware(BaseStorage.stream_read)
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stream_read_file = _location_aware(BaseStorage.stream_read_file)
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stream_write = _location_aware(BaseStorage.stream_write, requires_write=True)
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exists = _location_aware(BaseStorage.exists)
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remove = _location_aware(BaseStorage.remove, requires_write=True)
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validate = _location_aware(BaseStorage.validate, requires_write=True)
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get_checksum = _location_aware(BaseStorage.get_checksum)
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get_supports_resumable_downloads = _location_aware(BaseStorage.get_supports_resumable_downloads)
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initiate_chunked_upload = _location_aware(BaseStorageV2.initiate_chunked_upload,
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requires_write=True)
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stream_upload_chunk = _location_aware(BaseStorageV2.stream_upload_chunk,
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requires_write=True)
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complete_chunked_upload = _location_aware(BaseStorageV2.complete_chunked_upload,
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requires_write=True)
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cancel_chunked_upload = _location_aware(BaseStorageV2.cancel_chunked_upload,
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requires_write=True)
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def get_direct_download_url(self, locations, path, request_ip=None, expires_in=600,
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requires_cors=False, head=False):
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download_url = self._get_direct_download_url(locations, path, request_ip, expires_in,
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requires_cors, head)
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if download_url is None:
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return None
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if self.proxy is None:
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return download_url
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return self.proxy.proxy_download_url(download_url)
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def copy_between(self, path, source_location, destination_location):
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""" Copies a file between the source location and the destination location. """
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source_storage = self._storages[source_location]
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destination_storage = self._storages[destination_location]
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source_storage.copy_to(destination_storage, path)
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