import os
import shutil
from collections.abc import Generator
from contextlib import closing
from datetime import datetime, timedelta, timezone
from typing import Union
import boto3
import oss2 as aliyun_s3
from azure.storage.blob import AccountSasPermissions, BlobServiceClient, ResourceTypes, generate_account_sas
from botocore.client import Config
from botocore.exceptions import ClientError
from flask import Flask
class Storage:
def __init__(self):
self.storage_type = None
self.bucket_name = None
self.client = None
self.folder = None
def init_app(self, app: Flask):
self.storage_type = app.config.get('STORAGE_TYPE')
if self.storage_type == 's3':
self.bucket_name = app.config.get('S3_BUCKET_NAME')
self.client = boto3.client(
's3',
aws_secret_access_key=app.config.get('S3_SECRET_KEY'),
aws_access_key_id=app.config.get('S3_ACCESS_KEY'),
endpoint_url=app.config.get('S3_ENDPOINT'),
region_name=app.config.get('S3_REGION'),
config=Config(s3={'addressing_style': app.config.get('S3_ADDRESS_STYLE')})
)
elif self.storage_type == 'azure-blob':
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)
elif self.storage_type == 'aliyun-oss':
self.bucket_name = app.config.get('ALIYUN_OSS_BUCKET_NAME')
self.client = aliyun_s3.Bucket(
aliyun_s3.Auth(app.config.get('ALIYUN_OSS_ACCESS_KEY'), app.config.get('ALIYUN_OSS_SECRET_KEY')),
app.config.get('ALIYUN_OSS_ENDPOINT'),
self.bucket_name,
connect_timeout=30
)
else:
self.folder = app.config.get('STORAGE_LOCAL_PATH')
if not os.path.isabs(self.folder):
self.folder = os.path.join(app.root_path, self.folder)
def save(self, filename, data):
if self.storage_type == 's3':
self.client.put_object(Bucket=self.bucket_name, Key=filename, Body=data)
elif self.storage_type == 'azure-blob':
blob_container = self.client.get_container_client(container=self.bucket_name)
blob_container.upload_blob(filename, data)
elif self.storage_type == 'aliyun-oss':
self.client.put_object(filename, data)
else:
if not self.folder or self.folder.endswith('/'):
filename = self.folder + filename
else:
filename = self.folder + '/' + filename
folder = os.path.dirname(filename)
os.makedirs(folder, exist_ok=True)
with open(os.path.join(os.getcwd(), filename), "wb") as f:
f.write(data)
def load(self, filename: str, stream: bool = False) -> Union[bytes, Generator]:
if stream:
return self.load_stream(filename)
else:
return self.load_once(filename)
def load_once(self, filename: str) -> bytes:
if self.storage_type == 's3':
try:
with closing(self.client) as client:
data = client.get_object(Bucket=self.bucket_name, Key=filename)['Body'].read()
except ClientError as ex:
if ex.response['Error']['Code'] == 'NoSuchKey':
raise FileNotFoundError("File not found")
else:
raise
elif self.storage_type == 'azure-blob':
blob = self.client.get_container_client(container=self.bucket_name)
blob = blob.get_blob_client(blob=filename)
data = blob.download_blob().readall()
elif self.storage_type == 'aliyun-oss':
with closing(self.client.get_object(filename)) as obj:
data = obj.read()
else:
if not self.folder or self.folder.endswith('/'):
filename = self.folder + filename
else:
filename = self.folder + '/' + filename
if not os.path.exists(filename):
raise FileNotFoundError("File not found")
with open(filename, "rb") as f:
data = f.read()
return data
def load_stream(self, filename: str) -> Generator:
def generate(filename: str = filename) -> Generator:
if self.storage_type == 's3':
try:
with closing(self.client) as client:
response = client.get_object(Bucket=self.bucket_name, Key=filename)
for chunk in response['Body'].iter_chunks():
yield chunk
except ClientError as ex:
if ex.response['Error']['Code'] == 'NoSuchKey':
raise FileNotFoundError("File not found")
else:
raise
elif self.storage_type == 'azure-blob':
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
elif self.storage_type == 'aliyun-oss':
with closing(self.client.get_object(filename)) as obj:
while chunk := obj.read(4096):
yield chunk
else:
if not self.folder or self.folder.endswith('/'):
filename = self.folder + filename
else:
filename = self.folder + '/' + filename
if not os.path.exists(filename):
raise FileNotFoundError("File not found")
with open(filename, "rb") as f:
while chunk := f.read(4096): # Read in chunks of 4KB
yield chunk
return generate()
def download(self, filename, target_filepath):
if self.storage_type == 's3':
with closing(self.client) as client:
client.download_file(self.bucket_name, filename, target_filepath)
elif self.storage_type == 'azure-blob':
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)
elif self.storage_type == 'aliyun-oss':
self.client.get_object_to_file(filename, target_filepath)
else:
if not self.folder or self.folder.endswith('/'):
filename = self.folder + filename
else:
filename = self.folder + '/' + filename
if not os.path.exists(filename):
raise FileNotFoundError("File not found")
shutil.copyfile(filename, target_filepath)
def exists(self, filename):
if self.storage_type == 's3':
with closing(self.client) as client:
try:
client.head_object(Bucket=self.bucket_name, Key=filename)
return True
except:
return False
elif self.storage_type == 'azure-blob':
blob = self.client.get_blob_client(container=self.bucket_name, blob=filename)
return blob.exists()
elif self.storage_type == 'aliyun-oss':
return self.client.object_exists(filename)
else:
if not self.folder or self.folder.endswith('/'):
filename = self.folder + filename
else:
filename = self.folder + '/' + filename
return os.path.exists(filename)
def delete(self, filename):
if self.storage_type == 's3':
self.client.delete_object(Bucket=self.bucket_name, Key=filename)
elif self.storage_type == 'azure-blob':
blob_container = self.client.get_container_client(container=self.bucket_name)
blob_container.delete_blob(filename)
elif self.storage_type == 'aliyun-oss':
self.client.delete_object(filename)
else:
if not self.folder or self.folder.endswith('/'):
filename = self.folder + filename
else:
filename = self.folder + '/' + filename
if os.path.exists(filename):
os.remove(filename)
storage = Storage()
def init_app(app: Flask):
storage.init_app(app)