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58 lines
2.5 KiB
Python
58 lines
2.5 KiB
Python
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from collections.abc import Generator
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from contextlib import closing
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from datetime import datetime, timedelta, timezone
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from azure.storage.blob import AccountSasPermissions, BlobServiceClient, ResourceTypes, generate_account_sas
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from flask import Flask
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from extensions.storage.base_storage import BaseStorage
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class AzureStorage(BaseStorage):
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"""Implementation for azure storage.
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"""
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def __init__(self, app: Flask):
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super().__init__(app)
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app_config = self.app.config
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self.bucket_name = app_config.get('AZURE_STORAGE_CONTAINER_NAME')
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sas_token = generate_account_sas(
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account_name=app_config.get('AZURE_BLOB_ACCOUNT_NAME'),
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account_key=app_config.get('AZURE_BLOB_ACCOUNT_KEY'),
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resource_types=ResourceTypes(service=True, container=True, object=True),
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permission=AccountSasPermissions(read=True, write=True, delete=True, list=True, add=True, create=True),
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expiry=datetime.now(timezone.utc).replace(tzinfo=None) + timedelta(hours=1)
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)
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self.client = BlobServiceClient(account_url=app_config.get('AZURE_BLOB_ACCOUNT_URL'),
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credential=sas_token)
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def save(self, filename, data):
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blob_container = self.client.get_container_client(container=self.bucket_name)
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blob_container.upload_blob(filename, data)
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def load_once(self, filename: str) -> bytes:
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blob = self.client.get_container_client(container=self.bucket_name)
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blob = blob.get_blob_client(blob=filename)
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data = blob.download_blob().readall()
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return data
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def load_stream(self, filename: str) -> Generator:
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def generate(filename: str = filename) -> Generator:
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blob = self.client.get_blob_client(container=self.bucket_name, blob=filename)
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with closing(blob.download_blob()) as blob_stream:
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while chunk := blob_stream.readall(4096):
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yield chunk
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return generate()
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def download(self, filename, target_filepath):
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blob = self.client.get_blob_client(container=self.bucket_name, blob=filename)
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with open(target_filepath, "wb") as my_blob:
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blob_data = blob.download_blob()
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blob_data.readinto(my_blob)
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def exists(self, filename):
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blob = self.client.get_blob_client(container=self.bucket_name, blob=filename)
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return blob.exists()
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def delete(self, filename):
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blob_container = self.client.get_container_client(container=self.bucket_name)
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blob_container.delete_blob(filename)
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