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87 lines
3.2 KiB
Python
87 lines
3.2 KiB
Python
from collections.abc import Generator
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from contextlib import closing
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import boto3
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from botocore.client import Config
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from botocore.exceptions import ClientError
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from flask import Flask
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from extensions.storage.base_storage import BaseStorage
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class S3Storage(BaseStorage):
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"""Implementation for s3 storage."""
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def __init__(self, app: Flask):
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super().__init__(app)
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app_config = self.app.config
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self.bucket_name = app_config.get("S3_BUCKET_NAME")
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if app_config.get("S3_USE_AWS_MANAGED_IAM"):
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session = boto3.Session()
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self.client = session.client("s3")
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else:
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self.client = boto3.client(
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"s3",
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aws_secret_access_key=app_config.get("S3_SECRET_KEY"),
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aws_access_key_id=app_config.get("S3_ACCESS_KEY"),
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endpoint_url=app_config.get("S3_ENDPOINT"),
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region_name=app_config.get("S3_REGION"),
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config=Config(s3={"addressing_style": app_config.get("S3_ADDRESS_STYLE")}),
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)
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# create bucket
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try:
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self.client.head_bucket(Bucket=self.bucket_name)
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except ClientError as e:
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# if bucket not exists, create it
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if e.response["Error"]["Code"] == "404":
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self.client.create_bucket(Bucket=self.bucket_name)
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# if bucket is not accessible, pass, maybe the bucket is existing but not accessible
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elif e.response["Error"]["Code"] == "403":
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pass
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else:
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# other error, raise exception
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raise
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def save(self, filename, data):
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self.client.put_object(Bucket=self.bucket_name, Key=filename, Body=data)
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def load_once(self, filename: str) -> bytes:
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try:
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with closing(self.client) as client:
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data = client.get_object(Bucket=self.bucket_name, Key=filename)["Body"].read()
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except ClientError as ex:
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if ex.response["Error"]["Code"] == "NoSuchKey":
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raise FileNotFoundError("File not found")
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else:
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raise
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return data
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def load_stream(self, filename: str) -> Generator:
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def generate(filename: str = filename) -> Generator:
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try:
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with closing(self.client) as client:
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response = client.get_object(Bucket=self.bucket_name, Key=filename)
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yield from response["Body"].iter_chunks()
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except ClientError as ex:
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if ex.response["Error"]["Code"] == "NoSuchKey":
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raise FileNotFoundError("File not found")
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else:
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raise
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return generate()
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def download(self, filename, target_filepath):
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with closing(self.client) as client:
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client.download_file(self.bucket_name, filename, target_filepath)
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def exists(self, filename):
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with closing(self.client) as client:
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try:
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client.head_object(Bucket=self.bucket_name, Key=filename)
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return True
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except:
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return False
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def delete(self, filename):
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self.client.delete_object(Bucket=self.bucket_name, Key=filename)
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