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Native CLI i18n: The TrustGraph CLI has built-in translation support that dynamically loads language strings. You can test and use different languages by simply passing the --lang flag (e.g., --lang es for Spanish, --lang ru for Russian) or by configuring your environment's LANG variable. Automated Docs Translations: This PR introduces autonomously translated Markdown documentation into several target languages, including Spanish, Swahili, Portuguese, Turkish, Hindi, Hebrew, Arabic, Simplified Chinese, and Russian.
725 lines
27 KiB
Markdown
725 lines
27 KiB
Markdown
---
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layout: default
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title: "Especificación Técnica para el Cierre de Sesión Gratuito de Importación/Exportación"
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parent: "Spanish (Beta)"
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---
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<<<<<<< HEAD
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# Especificación Técnica para el Cierre de Sesión Gratuito de Importación/Exportación
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> **Beta Translation:** This document was translated via Machine Learning and as such may not be 100% accurate. All non-English languages are currently classified as Beta.
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## Declaración del Problema
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Actualmente, la puerta de enlace TrustGraph experimenta pérdida de mensajes durante el cierre de la conexión websocket tanto en las operaciones de importación como de exportación. Esto ocurre debido a condiciones de carrera donde los mensajes en tránsito se descartan antes de llegar a su destino (colas Pulsar para importaciones, clientes websocket para exportaciones).
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### Problemas del Lado de Importación
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1. El búfer de la cola asyncio del publicador no se vacía durante el apagado.
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2. La conexión websocket se cierra antes de asegurarse de que los mensajes en cola lleguen a Pulsar.
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3. No hay un mecanismo de confirmación para la entrega exitosa de mensajes.
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### Problemas del Lado de Exportación
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=======
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# Especificación Técnica para el Cierre Gratuito de Importación/Exportación
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## Declaración del Problema
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Actualmente, la puerta de enlace TrustGraph experimenta pérdida de mensajes durante el cierre de WebSocket tanto en las operaciones de importación como de exportación. Esto ocurre debido a condiciones de carrera donde los mensajes en tránsito se descartan antes de llegar a su destino (colas de Pulsar para importaciones, clientes de WebSocket para exportaciones).
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### Problemas del Lado de la Importación
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1. El búfer de la cola asyncio del publicador no se vacía durante el apagado.
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2. El WebSocket se cierra antes de asegurarse de que los mensajes en cola lleguen a Pulsar.
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3. No hay un mecanismo de confirmación para la entrega exitosa de mensajes.
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### Problemas del Lado de la Exportación
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>>>>>>> 82edf2d (New md files from RunPod)
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1. Los mensajes se confirman en Pulsar antes de la entrega exitosa a los clientes.
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2. Los tiempos de espera codificados de forma rígida causan la pérdida de mensajes cuando las colas están llenas.
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3. No hay un mecanismo de retroalimentación para manejar consumidores lentos.
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4. Múltiples puntos de búfer donde los datos pueden perderse.
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## Descripción General de la Arquitectura
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```
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Import Flow:
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Client -> Websocket -> TriplesImport -> Publisher -> Pulsar Queue
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Export Flow:
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Pulsar Queue -> Subscriber -> TriplesExport -> Websocket -> Client
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```
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## Soluciones propuestas
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### 1. Mejoras para el publicador (lado de importación)
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#### A. Vaciado de la cola de forma gradual
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**Archivo**: `trustgraph-base/trustgraph/base/publisher.py`
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```python
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class Publisher:
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def __init__(self, client, topic, schema=None, max_size=10,
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chunking_enabled=True, drain_timeout=5.0):
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self.client = client
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self.topic = topic
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self.schema = schema
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self.q = asyncio.Queue(maxsize=max_size)
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self.chunking_enabled = chunking_enabled
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self.running = True
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self.draining = False # New state for graceful shutdown
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self.task = None
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self.drain_timeout = drain_timeout
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async def stop(self):
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"""Initiate graceful shutdown with draining"""
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self.running = False
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self.draining = True
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if self.task:
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# Wait for run() to complete draining
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await self.task
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async def run(self):
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"""Enhanced run method with integrated draining logic"""
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while self.running or self.draining:
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try:
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producer = self.client.create_producer(
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topic=self.topic,
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schema=JsonSchema(self.schema),
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chunking_enabled=self.chunking_enabled,
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)
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drain_end_time = None
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while self.running or self.draining:
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try:
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# Start drain timeout when entering drain mode
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if self.draining and drain_end_time is None:
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drain_end_time = time.time() + self.drain_timeout
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logger.info(f"Publisher entering drain mode, timeout={self.drain_timeout}s")
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# Check drain timeout
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if self.draining and time.time() > drain_end_time:
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if not self.q.empty():
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logger.warning(f"Drain timeout reached with {self.q.qsize()} messages remaining")
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self.draining = False
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break
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# Calculate wait timeout based on mode
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if self.draining:
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# Shorter timeout during draining to exit quickly when empty
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timeout = min(0.1, drain_end_time - time.time())
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else:
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# Normal operation timeout
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timeout = 0.25
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# Get message from queue
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id, item = await asyncio.wait_for(
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self.q.get(),
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timeout=timeout
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)
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# Send the message (single place for sending)
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if id:
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producer.send(item, { "id": id })
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else:
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producer.send(item)
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except asyncio.TimeoutError:
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# If draining and queue is empty, we're done
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if self.draining and self.q.empty():
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logger.info("Publisher queue drained successfully")
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self.draining = False
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break
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continue
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except asyncio.QueueEmpty:
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# If draining and queue is empty, we're done
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if self.draining and self.q.empty():
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logger.info("Publisher queue drained successfully")
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self.draining = False
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break
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continue
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# Flush producer before closing
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if producer:
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producer.flush()
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producer.close()
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except Exception as e:
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logger.error(f"Exception in publisher: {e}", exc_info=True)
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if not self.running and not self.draining:
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return
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# If handler drops out, sleep a retry
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await asyncio.sleep(1)
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async def send(self, id, item):
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"""Send still works normally - just adds to queue"""
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if self.draining:
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# Optionally reject new messages during drain
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raise RuntimeError("Publisher is shutting down, not accepting new messages")
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await self.q.put((id, item))
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```
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**Beneficios Clave del Diseño:**
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**Ubicación Única para el Envío**: Todas las llamadas a `producer.send()` se realizan en un solo lugar dentro del método `run()`.
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**Máquina de Estados Clara**: Tres estados claros: en ejecución, en drenaje, detenido.
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**Protección contra Tiempo de Espera**: No se quedará bloqueado indefinidamente durante el drenaje.
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**Mejor Observabilidad**: Registro claro del progreso del drenaje y las transiciones de estado.
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**Rechazo de Mensajes Opcional**: Puede rechazar nuevos mensajes durante la fase de apagado.
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#### B. Orden de Apagado Mejorado
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**Archivo**: `trustgraph-flow/trustgraph/gateway/dispatch/triples_import.py`
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```python
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class TriplesImport:
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async def destroy(self):
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"""Enhanced destroy with proper shutdown order"""
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# Step 1: Stop accepting new messages
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self.running.stop()
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# Step 2: Wait for publisher to drain its queue
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logger.info("Draining publisher queue...")
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await self.publisher.stop()
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# Step 3: Close websocket only after queue is drained
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if self.ws:
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await self.ws.close()
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```
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### 2. Mejoras para el Suscriptor (Lado de Exportación)
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#### A. Patrón de Drenaje Integrado
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**Archivo**: `trustgraph-base/trustgraph/base/subscriber.py`
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```python
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class Subscriber:
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def __init__(self, client, topic, subscription, consumer_name,
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schema=None, max_size=100, metrics=None,
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backpressure_strategy="block", drain_timeout=5.0):
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# ... existing init ...
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self.backpressure_strategy = backpressure_strategy
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self.running = True
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self.draining = False # New state for graceful shutdown
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self.drain_timeout = drain_timeout
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self.pending_acks = {} # Track messages awaiting delivery
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async def stop(self):
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"""Initiate graceful shutdown with draining"""
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self.running = False
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self.draining = True
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if self.task:
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# Wait for run() to complete draining
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await self.task
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async def run(self):
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"""Enhanced run method with integrated draining logic"""
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while self.running or self.draining:
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if self.metrics:
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self.metrics.state("stopped")
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try:
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self.consumer = self.client.subscribe(
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topic = self.topic,
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subscription_name = self.subscription,
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consumer_name = self.consumer_name,
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schema = JsonSchema(self.schema),
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)
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if self.metrics:
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self.metrics.state("running")
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logger.info("Subscriber running...")
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drain_end_time = None
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while self.running or self.draining:
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# Start drain timeout when entering drain mode
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if self.draining and drain_end_time is None:
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drain_end_time = time.time() + self.drain_timeout
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logger.info(f"Subscriber entering drain mode, timeout={self.drain_timeout}s")
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# Stop accepting new messages from Pulsar during drain
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self.consumer.pause_message_listener()
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# Check drain timeout
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if self.draining and time.time() > drain_end_time:
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async with self.lock:
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total_pending = sum(
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q.qsize() for q in
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list(self.q.values()) + list(self.full.values())
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)
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if total_pending > 0:
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logger.warning(f"Drain timeout reached with {total_pending} messages in queues")
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self.draining = False
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break
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# Check if we can exit drain mode
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if self.draining:
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async with self.lock:
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all_empty = all(
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q.empty() for q in
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list(self.q.values()) + list(self.full.values())
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)
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if all_empty and len(self.pending_acks) == 0:
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logger.info("Subscriber queues drained successfully")
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self.draining = False
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break
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# Process messages only if not draining
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if not self.draining:
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try:
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msg = await asyncio.to_thread(
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self.consumer.receive,
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timeout_millis=250
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)
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except _pulsar.Timeout:
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continue
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except Exception as e:
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logger.error(f"Exception in subscriber receive: {e}", exc_info=True)
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raise e
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if self.metrics:
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self.metrics.received()
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# Process the message
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await self._process_message(msg)
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else:
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# During draining, just wait for queues to empty
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await asyncio.sleep(0.1)
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except Exception as e:
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logger.error(f"Subscriber exception: {e}", exc_info=True)
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finally:
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# Negative acknowledge any pending messages
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for msg in self.pending_acks.values():
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self.consumer.negative_acknowledge(msg)
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self.pending_acks.clear()
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if self.consumer:
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self.consumer.unsubscribe()
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self.consumer.close()
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self.consumer = None
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if self.metrics:
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self.metrics.state("stopped")
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if not self.running and not self.draining:
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return
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# If handler drops out, sleep a retry
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await asyncio.sleep(1)
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async def _process_message(self, msg):
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"""Process a single message with deferred acknowledgment"""
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# Store message for later acknowledgment
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msg_id = str(uuid.uuid4())
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self.pending_acks[msg_id] = msg
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try:
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id = msg.properties()["id"]
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except:
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id = None
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value = msg.value()
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delivery_success = False
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async with self.lock:
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# Deliver to specific subscribers
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if id in self.q:
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delivery_success = await self._deliver_to_queue(
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self.q[id], value
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)
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# Deliver to all subscribers
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for q in self.full.values():
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if await self._deliver_to_queue(q, value):
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delivery_success = True
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# Acknowledge only on successful delivery
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if delivery_success:
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self.consumer.acknowledge(msg)
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del self.pending_acks[msg_id]
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else:
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# Negative acknowledge for retry
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self.consumer.negative_acknowledge(msg)
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del self.pending_acks[msg_id]
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async def _deliver_to_queue(self, queue, value):
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"""Deliver message to queue with backpressure handling"""
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try:
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if self.backpressure_strategy == "block":
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# Block until space available (no timeout)
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await queue.put(value)
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return True
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elif self.backpressure_strategy == "drop_oldest":
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# Drop oldest message if queue full
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if queue.full():
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try:
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queue.get_nowait()
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if self.metrics:
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self.metrics.dropped()
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except asyncio.QueueEmpty:
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pass
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await queue.put(value)
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return True
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elif self.backpressure_strategy == "drop_new":
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# Drop new message if queue full
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if queue.full():
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if self.metrics:
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self.metrics.dropped()
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return False
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await queue.put(value)
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return True
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except Exception as e:
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logger.error(f"Failed to deliver message: {e}")
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return False
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```
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**Beneficios clave del diseño (que coinciden con el patrón del editor):**
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<<<<<<< HEAD
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**Ubicación de procesamiento única**: Todo el procesamiento de mensajes se realiza en el método `run()`.
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**Máquina de estados limpia**: Tres estados claros: en ejecución, vaciado, detenido.
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**Pausa durante el vaciado**: Deja de aceptar nuevos mensajes de Pulsar mientras vacía las colas existentes.
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**Protección por tiempo de espera**: No se quedará bloqueado indefinidamente durante el vaciado.
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**Limpieza adecuada**: Reconoce negativamente cualquier mensaje no entregado al apagar.
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=======
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**Ubicación de procesamiento única**: Todo el procesamiento de mensajes se realiza en el método `run()`
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**Máquina de estados limpia**: Tres estados claros: en ejecución, vaciado, detenido
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**Pausa durante el vaciado**: Deja de aceptar nuevos mensajes de Pulsar mientras vacía las colas existentes
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**Protección por tiempo de espera**: No se quedará bloqueado indefinidamente durante el vaciado
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**Limpieza adecuada**: Reconoce negativamente cualquier mensaje no entregado al apagar
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>>>>>>> 82edf2d (New md files from RunPod)
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#### B. Mejoras del controlador de exportación
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**Archivo**: `trustgraph-flow/trustgraph/gateway/dispatch/triples_export.py`
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```python
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class TriplesExport:
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async def destroy(self):
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"""Enhanced destroy with graceful shutdown"""
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# Step 1: Signal stop to prevent new messages
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self.running.stop()
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# Step 2: Wait briefly for in-flight messages
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await asyncio.sleep(0.5)
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# Step 3: Unsubscribe and stop subscriber (triggers queue drain)
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if hasattr(self, 'subs'):
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await self.subs.unsubscribe_all(self.id)
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await self.subs.stop()
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# Step 4: Close websocket last
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if self.ws and not self.ws.closed:
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await self.ws.close()
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async def run(self):
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"""Enhanced run with better error handling"""
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self.subs = Subscriber(
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client = self.pulsar_client,
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topic = self.queue,
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consumer_name = self.consumer,
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subscription = self.subscriber,
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schema = Triples,
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backpressure_strategy = "block" # Configurable
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)
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await self.subs.start()
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self.id = str(uuid.uuid4())
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q = await self.subs.subscribe_all(self.id)
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consecutive_errors = 0
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max_consecutive_errors = 5
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while self.running.get():
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try:
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resp = await asyncio.wait_for(q.get(), timeout=0.5)
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await self.ws.send_json(serialize_triples(resp))
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consecutive_errors = 0 # Reset on success
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except asyncio.TimeoutError:
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continue
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except queue.Empty:
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continue
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except Exception as e:
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logger.error(f"Exception sending to websocket: {str(e)}")
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consecutive_errors += 1
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if consecutive_errors >= max_consecutive_errors:
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logger.error("Too many consecutive errors, shutting down")
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break
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# Brief pause before retry
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await asyncio.sleep(0.1)
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# Graceful cleanup handled in destroy()
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```
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### 3. Mejoras a nivel de socket
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|
|
**Archivo**: `trustgraph-flow/trustgraph/gateway/endpoint/socket.py`
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|
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```python
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class SocketEndpoint:
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async def listener(self, ws, dispatcher, running):
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"""Enhanced listener with graceful shutdown"""
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async for msg in ws:
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if msg.type == WSMsgType.TEXT:
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await dispatcher.receive(msg)
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continue
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elif msg.type == WSMsgType.BINARY:
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await dispatcher.receive(msg)
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continue
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else:
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# Graceful shutdown on close
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logger.info("Websocket closing, initiating graceful shutdown")
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running.stop()
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# Allow time for dispatcher cleanup
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await asyncio.sleep(1.0)
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break
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async def handle(self, request):
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"""Enhanced handler with better cleanup"""
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# ... existing setup code ...
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try:
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async with asyncio.TaskGroup() as tg:
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running = Running()
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dispatcher = await self.dispatcher(
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ws, running, request.match_info
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)
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worker_task = tg.create_task(
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self.worker(ws, dispatcher, running)
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)
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lsnr_task = tg.create_task(
|
|
self.listener(ws, dispatcher, running)
|
|
)
|
|
|
|
except ExceptionGroup as e:
|
|
logger.error("Exception group occurred:", exc_info=True)
|
|
|
|
# Attempt graceful dispatcher shutdown
|
|
try:
|
|
await asyncio.wait_for(
|
|
dispatcher.destroy(),
|
|
timeout=5.0
|
|
)
|
|
except asyncio.TimeoutError:
|
|
logger.warning("Dispatcher shutdown timed out")
|
|
except Exception as de:
|
|
logger.error(f"Error during dispatcher cleanup: {de}")
|
|
|
|
except Exception as e:
|
|
logger.error(f"Socket exception: {e}", exc_info=True)
|
|
|
|
finally:
|
|
# Ensure dispatcher cleanup
|
|
if dispatcher and hasattr(dispatcher, 'destroy'):
|
|
try:
|
|
await dispatcher.destroy()
|
|
except:
|
|
pass
|
|
|
|
# Ensure websocket is closed
|
|
if ws and not ws.closed:
|
|
await ws.close()
|
|
|
|
return ws
|
|
```
|
|
|
|
## Opciones de configuración
|
|
|
|
Agregar soporte de configuración para ajustar el comportamiento:
|
|
|
|
```python
|
|
# config.py
|
|
class GracefulShutdownConfig:
|
|
# Publisher settings
|
|
PUBLISHER_DRAIN_TIMEOUT = 5.0 # Seconds to wait for queue drain
|
|
PUBLISHER_FLUSH_TIMEOUT = 2.0 # Producer flush timeout
|
|
|
|
# Subscriber settings
|
|
SUBSCRIBER_DRAIN_TIMEOUT = 5.0 # Seconds to wait for queue drain
|
|
BACKPRESSURE_STRATEGY = "block" # Options: "block", "drop_oldest", "drop_new"
|
|
SUBSCRIBER_MAX_QUEUE_SIZE = 100 # Maximum queue size before backpressure
|
|
|
|
# Socket settings
|
|
SHUTDOWN_GRACE_PERIOD = 1.0 # Seconds to wait for graceful shutdown
|
|
MAX_CONSECUTIVE_ERRORS = 5 # Maximum errors before forced shutdown
|
|
|
|
# Monitoring
|
|
LOG_QUEUE_STATS = True # Log queue statistics on shutdown
|
|
METRICS_ENABLED = True # Enable metrics collection
|
|
```
|
|
|
|
## Estrategia de pruebas
|
|
|
|
### Pruebas unitarias
|
|
|
|
```python
|
|
async def test_publisher_queue_drain():
|
|
"""Verify Publisher drains queue on shutdown"""
|
|
publisher = Publisher(...)
|
|
|
|
# Fill queue with messages
|
|
for i in range(10):
|
|
await publisher.send(f"id-{i}", {"data": i})
|
|
|
|
# Stop publisher
|
|
await publisher.stop()
|
|
|
|
# Verify all messages were sent
|
|
assert publisher.q.empty()
|
|
assert mock_producer.send.call_count == 10
|
|
|
|
async def test_subscriber_deferred_ack():
|
|
"""Verify Subscriber only acks on successful delivery"""
|
|
subscriber = Subscriber(..., backpressure_strategy="drop_new")
|
|
|
|
# Fill queue to capacity
|
|
queue = await subscriber.subscribe("test")
|
|
for i in range(100):
|
|
await queue.put({"data": i})
|
|
|
|
# Try to add message when full
|
|
msg = create_mock_message()
|
|
await subscriber._process_message(msg)
|
|
|
|
# Verify negative acknowledgment
|
|
assert msg.negative_acknowledge.called
|
|
assert not msg.acknowledge.called
|
|
```
|
|
|
|
### Pruebas de Integración
|
|
|
|
```python
|
|
async def test_import_graceful_shutdown():
|
|
"""Test import path handles shutdown gracefully"""
|
|
# Setup
|
|
import_handler = TriplesImport(...)
|
|
await import_handler.start()
|
|
|
|
# Send messages
|
|
messages = []
|
|
for i in range(100):
|
|
msg = {"metadata": {...}, "triples": [...]}
|
|
await import_handler.receive(msg)
|
|
messages.append(msg)
|
|
|
|
# Shutdown while messages in flight
|
|
await import_handler.destroy()
|
|
|
|
# Verify all messages reached Pulsar
|
|
received = await pulsar_consumer.receive_all()
|
|
assert len(received) == 100
|
|
|
|
async def test_export_no_message_loss():
|
|
"""Test export path doesn't lose acknowledged messages"""
|
|
# Setup Pulsar with test messages
|
|
for i in range(100):
|
|
await pulsar_producer.send({"data": i})
|
|
|
|
# Start export handler
|
|
export_handler = TriplesExport(...)
|
|
export_task = asyncio.create_task(export_handler.run())
|
|
|
|
# Receive some messages
|
|
received = []
|
|
for _ in range(50):
|
|
msg = await websocket.receive()
|
|
received.append(msg)
|
|
|
|
# Force shutdown
|
|
await export_handler.destroy()
|
|
|
|
# Continue receiving until websocket closes
|
|
while not websocket.closed:
|
|
try:
|
|
msg = await websocket.receive()
|
|
received.append(msg)
|
|
except:
|
|
break
|
|
|
|
# Verify no acknowledged messages were lost
|
|
assert len(received) >= 50
|
|
```
|
|
|
|
## Plan de Implementación
|
|
|
|
### Fase 1: Correcciones Críticas (Semana 1)
|
|
Corregir el tiempo de confirmación del suscriptor (prevenir la pérdida de mensajes)
|
|
Agregar el vaciado de la cola del publicador
|
|
<<<<<<< HEAD
|
|
Implementar en el entorno de pruebas
|
|
=======
|
|
Desplegar en el entorno de pruebas
|
|
>>>>>>> 82edf2d (New md files from RunPod)
|
|
|
|
### Fase 2: Cierre Gratuito (Semana 2)
|
|
Implementar la coordinación del cierre
|
|
Agregar estrategias de contrapresión
|
|
Pruebas de rendimiento
|
|
|
|
### Fase 3: Monitoreo y Ajuste (Semana 3)
|
|
Agregar métricas para las profundidades de la cola
|
|
Agregar alertas para la pérdida de mensajes
|
|
Ajustar los valores de tiempo de espera según los datos de producción
|
|
|
|
## Monitoreo y Alertas
|
|
|
|
### Métricas a Monitorear
|
|
`publisher.queue.depth` - Tamaño actual de la cola del publicador
|
|
`publisher.messages.dropped` - Mensajes perdidos durante el cierre
|
|
`subscriber.messages.negatively_acknowledged` - Entregas fallidas
|
|
<<<<<<< HEAD
|
|
`websocket.graceful_shutdowns` - Cierres gratuitos exitosos
|
|
=======
|
|
`websocket.graceful_shutdowns` - Cierres suaves exitosos
|
|
>>>>>>> 82edf2d (New md files from RunPod)
|
|
`websocket.forced_shutdowns` - Cierres forzados/por tiempo de espera
|
|
|
|
### Alertas
|
|
Profundidad de la cola del publicador > 80% de capacidad
|
|
Cualquier pérdida de mensajes durante el cierre
|
|
Tasa de acuse de recibo negativo del suscriptor > 1%
|
|
Tiempo de espera del cierre excedido
|
|
|
|
## Compatibilidad con Versiones Anteriores
|
|
|
|
Todos los cambios mantienen la compatibilidad con versiones anteriores:
|
|
El comportamiento predeterminado no cambia sin configuración
|
|
<<<<<<< HEAD
|
|
Las implementaciones existentes continúan funcionando
|
|
=======
|
|
Los despliegues existentes continúan funcionando
|
|
>>>>>>> 82edf2d (New md files from RunPod)
|
|
Degradación gradual si las nuevas funciones no están disponibles
|
|
|
|
## Consideraciones de Seguridad
|
|
|
|
No se introducen nuevos vectores de ataque
|
|
La contrapresión evita los ataques de agotamiento de memoria
|
|
Los límites configurables previenen el abuso de recursos
|
|
|
|
## Impacto en el Rendimiento
|
|
|
|
Sobre carga mínima durante la operación normal
|
|
El cierre puede tardar hasta 5 segundos más (configurable)
|
|
El uso de memoria está limitado por los límites del tamaño de la cola
|
|
El impacto en la CPU es insignificante (<1% de aumento)
|