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