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from __future__ import annotations
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import os
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from io import BytesIO
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from typing import BinaryIO, Dict, Optional
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from .interface import StorageInterface
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class QiniuKodoStorage(StorageInterface):
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"""七牛云Kodo存储适配器"""
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storage_type = "qiniu_kodo"
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def __init__(self, config: dict):
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try:
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from qiniu import Auth, BucketManager, put_data
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except ImportError:
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raise ImportError("请先安装 qiniu: pip install qiniu")
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self.access_key = config.get("access_key")
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self.secret_key = config.get("secret_key")
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self.bucket_name = config.get("bucket")
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self.domain = config.get("domain") # CDN域名
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if not all([self.access_key, self.secret_key, self.bucket_name]):
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raise ValueError("七牛云Kodo配置不完整，需要: access_key, secret_key, bucket")
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self.auth = Auth(self.access_key, self.secret_key)
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self.bucket_manager = BucketManager(self.auth)
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self.put_data = put_data
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def upload(self, file_stream: BinaryIO, key: str, mime_type: Optional[str] = None) -> Dict:
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"""上传文件到七牛云Kodo"""
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token = self.auth.upload_token(self.bucket_name, key)
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data = file_stream.read()
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ret, info = self.put_data(token, key, data, mime_type=mime_type)
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if info.status_code != 200:
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raise Exception(f"七牛云上传失败: {info}")
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return {
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"hash": ret.get("hash"),
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"key": ret.get("key"),
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}
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def append_chunk(self, key: str, chunk_stream: BinaryIO, offset: int) -> None:
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"""
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追加写入数据块
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注意：七牛云不支持原生append，采用读-改-写策略
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"""
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chunk_data = chunk_stream.read()
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# 如果文件已存在，先下载
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existing_data = b""
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if self.exists(key):
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try:
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file_stream = self.download(key)
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existing_data = file_stream.read()
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except Exception:
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pass
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# 合并数据
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if offset == 0:
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new_data = chunk_data
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else:
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new_data = existing_data[:offset] + chunk_data
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# 重新上传
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token = self.auth.upload_token(self.bucket_name, key)
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self.put_data(token, key, new_data)
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def download(self, key: str) -> BinaryIO:
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"""从七牛云Kodo下载文件"""
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# 生成私有下载链接
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base_url = f"http://{self.domain}/{key}" if self.domain else f"http://{self.bucket_name}.kodo.com/{key}"
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private_url = self.auth.private_download_url(base_url, expires=3600)
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# 下载文件
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import requests
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response = requests.get(private_url)
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if response.status_code != 200:
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raise FileNotFoundError(f"文件不存在: {key}")
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return BytesIO(response.content)
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def delete(self, key: str) -> None:
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"""删除Kodo文件"""
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ret, info = self.bucket_manager.delete(self.bucket_name, key)
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if info.status_code not in [200, 612]: # 612表示文件不存在
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raise Exception(f"删除文件失败: {info}")
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def exists(self, key: str) -> bool:
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"""检查Kodo文件是否存在"""
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ret, info = self.bucket_manager.stat(self.bucket_name, key)
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return info.status_code == 200
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def get_url(self, key: str, expires: int = 3600) -> str:
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"""获取Kodo文件访问URL"""
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base_url = f"http://{self.domain}/{key}" if self.domain else f"http://{self.bucket_name}.kodo.com/{key}"
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if expires == 0:
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# 永久URL（适用于公共读bucket）
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return base_url
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# 生成带签名的临时URL
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return self.auth.private_download_url(base_url, expires=expires)
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