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54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
"""Azure Blob Storage backend (the first production target)."""
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from __future__ import annotations
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from collections.abc import AsyncIterator
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from app.file_storage.backends.base import StorageBackend
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class AzureBlobBackend(StorageBackend):
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"""Stores objects as blobs in an Azure Blob Storage container."""
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backend_name = "azure"
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def __init__(self, *, connection_string: str, container: str) -> None:
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self._connection_string = connection_string
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self._container = container
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def _service(self):
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from azure.storage.blob.aio import BlobServiceClient
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return BlobServiceClient.from_connection_string(self._connection_string)
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async def put(
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self, key: str, data: bytes, *, content_type: str | None = None
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) -> None:
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from azure.storage.blob import ContentSettings
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settings = ContentSettings(content_type=content_type) if content_type else None
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async with self._service() as service:
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blob = service.get_blob_client(self._container, key)
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await blob.upload_blob(data, overwrite=True, content_settings=settings)
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async def open_stream(self, key: str) -> AsyncIterator[bytes]:
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async with self._service() as service:
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blob = service.get_blob_client(self._container, key)
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downloader = await blob.download_blob()
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async for chunk in downloader.chunks():
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yield chunk
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async def delete(self, key: str) -> None:
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from azure.core.exceptions import ResourceNotFoundError
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async with self._service() as service:
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blob = service.get_blob_client(self._container, key)
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try:
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await blob.delete_blob()
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except ResourceNotFoundError:
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pass
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async def exists(self, key: str) -> bool:
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async with self._service() as service:
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blob = service.get_blob_client(self._container, key)
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return await blob.exists()
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