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| import base64 | |
| import io | |
| from collections.abc import Generator | |
| from contextlib import closing | |
| from flask import Flask | |
| from google.cloud import storage as GoogleCloudStorage | |
| from extensions.storage.base_storage import BaseStorage | |
| class GoogleStorage(BaseStorage): | |
| """Implementation for google storage. | |
| """ | |
| def __init__(self, app: Flask): | |
| super().__init__(app) | |
| app_config = self.app.config | |
| self.bucket_name = app_config.get('GOOGLE_STORAGE_BUCKET_NAME') | |
| service_account_json_str = app_config.get('GOOGLE_STORAGE_SERVICE_ACCOUNT_JSON_BASE64') | |
| # if service_account_json_str is empty, use Application Default Credentials | |
| if service_account_json_str: | |
| service_account_json = base64.b64decode(service_account_json_str).decode('utf-8') | |
| self.client = GoogleCloudStorage.Client.from_service_account_info(service_account_json) | |
| else: | |
| self.client = GoogleCloudStorage.Client() | |
| def save(self, filename, data): | |
| bucket = self.client.get_bucket(self.bucket_name) | |
| blob = bucket.blob(filename) | |
| with io.BytesIO(data) as stream: | |
| blob.upload_from_file(stream) | |
| def load_once(self, filename: str) -> bytes: | |
| bucket = self.client.get_bucket(self.bucket_name) | |
| blob = bucket.get_blob(filename) | |
| data = blob.download_as_bytes() | |
| return data | |
| def load_stream(self, filename: str) -> Generator: | |
| def generate(filename: str = filename) -> Generator: | |
| bucket = self.client.get_bucket(self.bucket_name) | |
| blob = bucket.get_blob(filename) | |
| with closing(blob.open(mode='rb')) as blob_stream: | |
| while chunk := blob_stream.read(4096): | |
| yield chunk | |
| return generate() | |
| def download(self, filename, target_filepath): | |
| bucket = self.client.get_bucket(self.bucket_name) | |
| blob = bucket.get_blob(filename) | |
| with open(target_filepath, "wb") as my_blob: | |
| blob_data = blob.download_blob() | |
| blob_data.readinto(my_blob) | |
| def exists(self, filename): | |
| bucket = self.client.get_bucket(self.bucket_name) | |
| blob = bucket.blob(filename) | |
| return blob.exists() | |
| def delete(self, filename): | |
| bucket = self.client.get_bucket(self.bucket_name) | |
| bucket.delete_blob(filename) |