| from collections.abc import Generator | |
| from datetime import datetime, timedelta, timezone | |
| from azure.storage.blob import AccountSasPermissions, BlobServiceClient, ResourceTypes, generate_account_sas | |
| from configs import dify_config | |
| from extensions.ext_redis import redis_client | |
| from extensions.storage.base_storage import BaseStorage | |
| class AzureBlobStorage(BaseStorage): | |
| """Implementation for Azure Blob storage.""" | |
| def __init__(self): | |
| super().__init__() | |
| self.bucket_name = dify_config.AZURE_BLOB_CONTAINER_NAME | |
| self.account_url = dify_config.AZURE_BLOB_ACCOUNT_URL | |
| self.account_name = dify_config.AZURE_BLOB_ACCOUNT_NAME | |
| self.account_key = dify_config.AZURE_BLOB_ACCOUNT_KEY | |
| def save(self, filename, data): | |
| client = self._sync_client() | |
| blob_container = client.get_container_client(container=self.bucket_name) | |
| blob_container.upload_blob(filename, data) | |
| def load_once(self, filename: str) -> bytes: | |
| client = self._sync_client() | |
| blob = 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: | |
| client = self._sync_client() | |
| blob = client.get_blob_client(container=self.bucket_name, blob=filename) | |
| blob_data = blob.download_blob() | |
| yield from blob_data.chunks() | |
| def download(self, filename, target_filepath): | |
| client = self._sync_client() | |
| blob = 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): | |
| client = self._sync_client() | |
| blob = client.get_blob_client(container=self.bucket_name, blob=filename) | |
| return blob.exists() | |
| def delete(self, filename): | |
| client = self._sync_client() | |
| blob_container = client.get_container_client(container=self.bucket_name) | |
| blob_container.delete_blob(filename) | |
| def _sync_client(self): | |
| cache_key = "azure_blob_sas_token_{}_{}".format(self.account_name, self.account_key) | |
| cache_result = redis_client.get(cache_key) | |
| if cache_result is not None: | |
| sas_token = cache_result.decode("utf-8") | |
| else: | |
| sas_token = generate_account_sas( | |
| account_name=self.account_name, | |
| account_key=self.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), | |
| ) | |
| redis_client.set(cache_key, sas_token, ex=3000) | |
| return BlobServiceClient(account_url=self.account_url, credential=sas_token) | |