| 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) |