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# Copyright (C) 2025 John Turner
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import asyncio
import zstandard
import aiosqlite
from aiosqlite import DatabaseError
from pypaste.server import Storage, Paste, Key, StorageError
from pypaste.server.s3.bucket import Bucket, BucketError
from dataclasses import dataclass
from typing import Optional
@dataclass
class S3(Storage):
connection: aiosqlite.Connection
def __init__(
self,
connection: aiosqlite.Connection,
endpoint: str,
region: str,
bucket: str,
access_key: str,
secret_key: str,
):
self.connection = connection
self.bucket = Bucket(endpoint, region, bucket, access_key, secret_key)
async def setup(self) -> None:
await self.connection.execute("create table if not exists s3(key blob)")
await self.connection.commit()
async def insert(self, paste: Paste, key: Key) -> None:
def compress():
return zstandard.compress(paste.text.encode())
compressed = await asyncio.to_thread(compress)
await self.connection.execute(
"insert into pastes values(?, ?, ?, ?, ?)",
(key.data, key.length, paste.dt.isoformat(), len(compressed), paste.syntax),
)
await self.connection.execute("insert into s3 values(?)", (key.data,))
try:
await self.bucket.put(key.data.hex(), compressed)
await self.connection.commit()
except BucketError as e:
await self.connection.rollback()
raise StorageError(str(e))
except DatabaseError as e:
await self.connection.rollback()
raise StorageError(str(e))
async def retrieve(self, key: Key) -> Optional[Paste]:
if not await self.exists(key):
return None
info = await self.read_paste_info(key)
assert info is not None
data = await self.bucket.get(key.data.hex())
assert data is not None
def decompress() -> str:
return zstandard.decompress(data).decode()
text = await asyncio.to_thread(decompress)
return Paste(info.dt, info.syntax, text)
async def delete(self, key: Key) -> None:
await self.connection.execute("begin")
await self.connection.execute("delete from pastes where key=?", (key.data,))
await self.connection.execute("delete from s3 where key=?", (key.data,))
try:
await self.bucket.delete(key.data.hex())
await self.connection.commit()
except BucketError as e:
await self.connection.rollback()
raise StorageError(str(e))
except DatabaseError as e:
await self.connection.rollback()
raise StorageError(str(e))
async def exists(self, key: Key) -> bool:
async with self.connection.execute(
"select 1 from s3 where key=?", (key.data,)
) as cursor:
return await cursor.fetchone() is not None
async def storage_use(self) -> Optional[int]:
async with self.connection.execute(
(
"select sum(pastes.size) from pastes "
"inner join s3 on s3.key=pastes.key"
)
) as cursor:
match await cursor.fetchone():
case [int(use)]:
return use
case None:
return None
case _:
raise Exception("unreachable")
async def oldest(self) -> Optional[Key]:
async with self.connection.execute(
(
"select pastes.key,pastes.key_length from pastes "
"inner join s3 on s3.key=pastes.key "
"order by pastes.datetime"
)
) as cursor:
match await cursor.fetchone():
case [bytes(data), int(length)]:
return Key(data, length)
case None:
return None
case _:
raise Exception("unreachable")
async def vacuum(self, max: int) -> None:
while True:
if (use := await self.storage_use()) is None:
return
if (oldest := await self.oldest()) is None:
return
if use > max:
await self.delete(oldest)
else:
return
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