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# server.py
import asyncio
import importlib.metadata
import json
import logging
import secrets
import uuid
from dataclasses import dataclass, asdict
from typing import Any, AsyncGenerator, Dict, Tuple, Union
from quart import Quart, websocket, request, send_from_directory
from quart_schema import QuartSchema, validate_request, validate_response
from starlette.middleware.proxy_headers import ProxyHeadersMiddleware # Importar ProxyHeadersMiddleware de Starlette
# Configuraciones
TIMEOUT: int = 40
LOG_LEVEL: int = logging.DEBUG
TRUSTED_HOSTS: list[str] = ["127.0.0.1", "172.18.0.3"]
# Inicializaci贸n de la aplicaci贸n Quart
app = Quart(__name__)
QuartSchema(app)
app.asgi_app = ProxyHeadersMiddleware(
app.asgi_app,
x_for=1,
x_proto=1,
x_host=1,
x_port=1,
x_prefix=1
)
app.logger.setLevel(LOG_LEVEL)
# Excepciones personalizadas
class SessionDoesNotExist(Exception):
"""Error al solicitar un ID de sesi贸n que no existe."""
pass
class SessionAlreadyExists(Exception):
"""Error al crear una sesi贸n con un ID que ya existe."""
pass
class ClientError(Exception):
"""Error cuando el cliente devuelve un error."""
def __init__(self, message: str):
super().__init__(message)
self.message = message
# Clases de datos para solicitudes y respuestas
@dataclass
class ClientRequest:
request_id: str
data: Any
@dataclass
class ClientResponse:
request_id: str
error: bool
data: Any
@dataclass
class Status:
status: str
version: str
@dataclass
class Session:
session_id: str
@dataclass
class Command:
session_id: str
command: str
@dataclass
class Read:
session_id: str
path: str
@dataclass
class Write:
session_id: str
path: str
content: str
@dataclass
class CommandResponse:
return_code: int
stdout: str
stderr: str
@dataclass
class ReadResponse:
content: str
@dataclass
class WriteResponse:
size: int
@dataclass
class ErrorResponse:
error: str
# Broker para manejar sesiones y comunicaciones
class SessionBroker:
def __init__(self):
"""Diccionario de session_id -> cola de mensajes pendientes por enviar al cliente"""
self.sessions: Dict[str, asyncio.Queue] = {}
"""Diccionario de (session_id, request_id) -> futuro de la respuesta del cliente"""
self.pending_responses: Dict[Tuple[str, str], asyncio.Future] = {}
async def send_request(self, session_id: str, data: Any, timeout: int = 60) -> Any:
if session_id not in self.sessions:
raise SessionDoesNotExist()
request_id = str(uuid.uuid4())
loop = asyncio.get_event_loop()
future = loop.create_future()
self.pending_responses[(session_id, request_id)] = future
await self.sessions[session_id].put(ClientRequest(request_id=request_id, data=data))
try:
return await asyncio.wait_for(future, timeout)
except asyncio.TimeoutError:
raise
finally:
self.pending_responses.pop((session_id, request_id), None)
async def receive_response(self, session_id: str, response: ClientResponse) -> None:
key = (session_id, response.request_id)
future = self.pending_responses.pop(key, None)
if future and not future.done():
if response.error:
future.set_exception(ClientError(message=response.data))
else:
future.set_result(response.data)
async def subscribe(self, session_id: str) -> AsyncGenerator[ClientRequest, None]:
if session_id in self.sessions:
raise SessionAlreadyExists()
queue = asyncio.Queue()
self.sessions[session_id] = queue
try:
while True:
yield await queue.get()
finally:
del self.sessions[session_id]
# Eliminar todas las respuestas pendientes de esta sesi贸n
keys_to_remove = [key for key in self.pending_responses if key[0] == session_id]
for key in keys_to_remove:
future = self.pending_responses.pop(key)
if not future.done():
future.set_exception(SessionDoesNotExist())
# Instanciaci贸n del broker
broker = SessionBroker()
# Funciones y rutas de la API
async def _receive(session_id: str) -> None:
while True:
try:
message = await websocket.receive()
response_data = json.loads(message)
client_response = ClientResponse(**response_data)
app.logger.info(f"{websocket.remote_addr} - RESPONSE - {session_id} - {json.dumps(asdict(client_response))}")
await broker.receive_response(session_id, client_response)
except Exception as e:
app.logger.error(f"Error al recibir respuesta: {e}")
break
@app.get("/wss/status")
@validate_response(Status)
async def status() -> Status:
try:
version = importlib.metadata.version('serverwitch-api')
except importlib.metadata.PackageNotFoundError:
version = "unknown"
return Status(status="OK", version=version)
@app.websocket('/wss/session')
async def session_handler():
session_id = secrets.token_hex()
app.logger.info(f"{websocket.remote_addr} - NEW SESSION - {session_id}")
session_message = Session(session_id=session_id)
await websocket.send(json.dumps(asdict(session_message)))
task = asyncio.create_task(_receive(session_id))
try:
async for request_data in broker.subscribe(session_id):
app.logger.info(f"{websocket.remote_addr} - REQUEST - {session_id} - {json.dumps(asdict(request_data))}")
await websocket.send(json.dumps(asdict(request_data)))
except SessionAlreadyExists:
error_response = ErrorResponse(error="Session already exists.")
await websocket.send(json.dumps(asdict(error_response)))
finally:
task.cancel()
try:
await task
except asyncio.CancelledError:
pass
@app.post('/wss/command')
@validate_request(Command)
@validate_response(CommandResponse, 200)
@validate_response(ErrorResponse, 500)
async def command(data: Command) -> Tuple[Union[CommandResponse, ErrorResponse], int]:
try:
response_data = await broker.send_request(
data.session_id,
{'action': 'command', 'command': data.command},
timeout=TIMEOUT
)
response = CommandResponse(**response_data)
return response, 200
except SessionDoesNotExist:
app.logger.warning(f"{request.remote_addr} - INVALID SESSION ID - {repr(data.session_id)}")
return ErrorResponse(error='Session does not exist.'), 500
except ClientError as e:
return ErrorResponse(error=e.message), 500
except asyncio.TimeoutError:
return ErrorResponse(error='Timeout when waiting for client.'), 500
@app.post('/wss/read')
@validate_request(Read)
@validate_response(ReadResponse, 200)
@validate_response(ErrorResponse, 500)
async def read(data: Read) -> Tuple[Union[ReadResponse, ErrorResponse], int]:
try:
response_data = await broker.send_request(
data.session_id,
{'action': 'read', 'path': data.path},
timeout=TIMEOUT
)
response = ReadResponse(**response_data)
return response, 200
except SessionDoesNotExist:
app.logger.warning(f"{request.remote_addr} - INVALID SESSION ID - {repr(data.session_id)}")
return ErrorResponse(error='Session does not exist.'), 500
except ClientError as e:
return ErrorResponse(error=e.message), 500
except asyncio.TimeoutError:
return ErrorResponse(error='Timeout when waiting for client.'), 500
@app.post('/wss/write')
@validate_request(Write)
@validate_response(WriteResponse, 200)
@validate_response(ErrorResponse, 500)
async def write(data: Write) -> Tuple[Union[WriteResponse, ErrorResponse], int]:
try:
response_data = await broker.send_request(
data.session_id,
{'action': 'write', 'path': data.path, 'content': data.content},
timeout=TIMEOUT
)
response = WriteResponse(**response_data)
return response, 200
except SessionDoesNotExist:
app.logger.warning(f"{request.remote_addr} - INVALID SESSION ID - {repr(data.session_id)}")
return ErrorResponse(error='Session does not exist.'), 500
except ClientError as e:
return ErrorResponse(error=e.message), 500
except asyncio.TimeoutError:
return ErrorResponse(error='Timeout when waiting for client.'), 500
# Rutas para servir archivos est谩ticos y OpenAPI
@app.route('/static/<path:path>')
async def send_static(path):
return await send_from_directory('static', path)
@app.route('/openapi.yaml')
async def openapi_spec():
return await send_from_directory('.', 'openapi.yaml')
# No se necesita ejecutar nada aqu铆, ya que Hypercorn se encargar谩 de iniciar la aplicaci贸n |