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Anibal Angulo
373
src/capa_de_integracion/services/redis_service.py
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373
src/capa_de_integracion/services/redis_service.py
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"""
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Copyright 2025 Google. This software is provided as-is, without warranty or
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representation for any use or purpose. Your use of it is subject to your
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agreement with Google.
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Redis service for caching conversation sessions.
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"""
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import json
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import logging
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from datetime import datetime
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from redis.asyncio import Redis
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from ..config import Settings
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from ..models import ConversationSessionDTO
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from ..models.notification import NotificationSessionDTO, NotificationDTO
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logger = logging.getLogger(__name__)
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class RedisService:
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"""Service for Redis operations on conversation sessions."""
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def __init__(self, settings: Settings):
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"""Initialize Redis client."""
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self.settings = settings
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self.redis: Redis | None = None
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self.session_ttl = 2592000 # 30 days in seconds
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self.notification_ttl = 2592000 # 30 days in seconds
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async def connect(self):
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"""Connect to Redis."""
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self.redis = Redis(
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host=self.settings.redis_host,
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port=self.settings.redis_port,
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password=self.settings.redis_password,
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ssl=self.settings.redis_ssl,
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decode_responses=True,
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)
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logger.info(
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f"Connected to Redis at {self.settings.redis_host}:{self.settings.redis_port}"
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)
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async def close(self):
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"""Close Redis connection."""
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if self.redis:
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await self.redis.close()
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logger.info("Redis connection closed")
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def _session_key(self, session_id: str) -> str:
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"""Generate Redis key for conversation session."""
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return f"conversation:session:{session_id}"
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def _phone_to_session_key(self, phone: str) -> str:
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"""Generate Redis key for phone-to-session mapping."""
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return f"conversation:phone:{phone}"
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async def get_session(
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self, session_id_or_phone: str
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) -> ConversationSessionDTO | None:
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"""
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Retrieve conversation session from Redis by session ID or phone number.
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Args:
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session_id_or_phone: Either a session ID or phone number
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Returns:
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Conversation session or None if not found
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"""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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# First try as phone number (lookup session ID)
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phone_key = self._phone_to_session_key(session_id_or_phone)
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mapped_session_id = await self.redis.get(phone_key)
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if mapped_session_id:
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# Found phone mapping, get the actual session
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session_id = mapped_session_id
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else:
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# Try as direct session ID
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session_id = session_id_or_phone
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# Get session by ID
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key = self._session_key(session_id)
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data = await self.redis.get(key)
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if not data:
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logger.debug(f"Session not found in Redis: {session_id_or_phone}")
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return None
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try:
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session_dict = json.loads(data)
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session = ConversationSessionDTO.model_validate(session_dict)
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logger.debug(f"Retrieved session from Redis: {session_id}")
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return session
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except Exception as e:
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logger.error(f"Error deserializing session {session_id}: {str(e)}")
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return None
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async def save_session(self, session: ConversationSessionDTO) -> bool:
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"""
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Save conversation session to Redis with TTL.
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Also stores phone-to-session mapping for lookup by phone number.
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"""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._session_key(session.sessionId)
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phone_key = self._phone_to_session_key(session.telefono)
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try:
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# Save session data
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data = session.model_dump_json(by_alias=False)
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await self.redis.setex(key, self.session_ttl, data)
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# Save phone-to-session mapping
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await self.redis.setex(phone_key, self.session_ttl, session.sessionId)
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logger.debug(
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f"Saved session to Redis: {session.sessionId} for phone: {session.telefono}"
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)
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return True
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except Exception as e:
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logger.error(f"Error saving session {session.sessionId} to Redis: {str(e)}")
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return False
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async def delete_session(self, session_id: str) -> bool:
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"""Delete conversation session from Redis."""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._session_key(session_id)
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try:
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result = await self.redis.delete(key)
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logger.debug(f"Deleted session from Redis: {session_id}")
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return result > 0
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except Exception as e:
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logger.error(f"Error deleting session {session_id} from Redis: {str(e)}")
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return False
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async def exists(self, session_id: str) -> bool:
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"""Check if session exists in Redis."""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._session_key(session_id)
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return await self.redis.exists(key) > 0
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# ====== Message Methods ======
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def _messages_key(self, session_id: str) -> str:
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"""Generate Redis key for conversation messages."""
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return f"conversation:messages:{session_id}"
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async def save_message(self, session_id: str, message) -> bool:
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"""
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Save a conversation message to Redis sorted set.
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Messages are stored in a sorted set with timestamp as score.
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Args:
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session_id: The session ID
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message: ConversationMessageDTO or ConversationEntryDTO
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Returns:
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True if successful, False otherwise
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"""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._messages_key(session_id)
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try:
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# Convert message to JSON
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message_data = message.model_dump_json(by_alias=False)
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# Use timestamp as score (in milliseconds)
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score = message.timestamp.timestamp() * 1000
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# Add to sorted set
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await self.redis.zadd(key, {message_data: score})
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# Set TTL on the messages key to match session TTL
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await self.redis.expire(key, self.session_ttl)
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logger.debug(f"Saved message to Redis: {session_id}")
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return True
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except Exception as e:
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logger.error(f"Error saving message to Redis for session {session_id}: {str(e)}")
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return False
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async def get_messages(self, session_id: str) -> list:
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"""
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Retrieve all conversation messages for a session from Redis.
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Returns messages ordered by timestamp (oldest first).
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Args:
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session_id: The session ID
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Returns:
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List of message dictionaries (parsed from JSON)
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"""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._messages_key(session_id)
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try:
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# Get all messages from sorted set (ordered by score/timestamp)
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message_strings = await self.redis.zrange(key, 0, -1)
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if not message_strings:
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logger.debug(f"No messages found in Redis for session: {session_id}")
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return []
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# Parse JSON strings to dictionaries
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messages = []
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for msg_str in message_strings:
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try:
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messages.append(json.loads(msg_str))
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except json.JSONDecodeError as e:
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logger.error(f"Error parsing message JSON: {str(e)}")
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continue
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logger.debug(f"Retrieved {len(messages)} messages from Redis for session: {session_id}")
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return messages
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except Exception as e:
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logger.error(f"Error retrieving messages from Redis for session {session_id}: {str(e)}")
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return []
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# ====== Notification Methods ======
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def _notification_key(self, session_id: str) -> str:
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"""Generate Redis key for notification session."""
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return f"notification:{session_id}"
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def _phone_to_notification_key(self, phone: str) -> str:
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"""Generate Redis key for phone-to-notification mapping."""
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return f"notification:phone_to_notification:{phone}"
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async def save_or_append_notification(self, new_entry: NotificationDTO) -> None:
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"""
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Save or append notification entry to session.
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Args:
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new_entry: Notification entry to save
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Raises:
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ValueError: If phone number is missing
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"""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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phone_number = new_entry.telefono
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if not phone_number or not phone_number.strip():
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raise ValueError("Phone number is required to manage notification entries")
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# Use phone number as session ID for notifications
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notification_session_id = phone_number
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# Get existing session or create new one
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existing_session = await self.get_notification_session(notification_session_id)
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if existing_session:
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# Append to existing session
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updated_notifications = existing_session.notificaciones + [new_entry]
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updated_session = NotificationSessionDTO(
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session_id=notification_session_id,
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telefono=phone_number,
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fecha_creacion=existing_session.fecha_creacion,
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ultima_actualizacion=datetime.now(),
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notificaciones=updated_notifications,
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)
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else:
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# Create new session
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updated_session = NotificationSessionDTO(
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session_id=notification_session_id,
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telefono=phone_number,
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fecha_creacion=datetime.now(),
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ultima_actualizacion=datetime.now(),
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notificaciones=[new_entry],
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)
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# Save to Redis
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await self._cache_notification_session(updated_session)
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async def _cache_notification_session(
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self, session: NotificationSessionDTO
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) -> bool:
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"""Cache notification session in Redis."""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._notification_key(session.sessionId)
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phone_key = self._phone_to_notification_key(session.telefono)
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try:
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# Save notification session
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data = session.model_dump_json(by_alias=False)
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await self.redis.setex(key, self.notification_ttl, data)
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# Save phone-to-session mapping
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await self.redis.setex(phone_key, self.notification_ttl, session.sessionId)
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logger.debug(f"Cached notification session: {session.sessionId}")
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return True
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except Exception as e:
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logger.error(
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f"Error caching notification session {session.sessionId}: {str(e)}"
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)
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return False
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async def get_notification_session(
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self, session_id: str
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) -> NotificationSessionDTO | None:
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"""Retrieve notification session from Redis."""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._notification_key(session_id)
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data = await self.redis.get(key)
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if not data:
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logger.debug(f"Notification session not found in Redis: {session_id}")
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return None
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try:
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session_dict = json.loads(data)
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session = NotificationSessionDTO.model_validate(session_dict)
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logger.info(f"Notification session {session_id} retrieved from Redis")
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return session
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except Exception as e:
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logger.error(
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f"Error deserializing notification session {session_id}: {str(e)}"
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)
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return None
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async def get_notification_id_for_phone(self, phone: str) -> str | None:
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"""Get notification session ID for a phone number."""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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key = self._phone_to_notification_key(phone)
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session_id = await self.redis.get(key)
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if session_id:
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logger.info(f"Session ID {session_id} found for phone")
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else:
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logger.debug("Session ID not found for phone")
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return session_id
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async def delete_notification_session(self, phone_number: str) -> bool:
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"""Delete notification session from Redis."""
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if not self.redis:
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raise RuntimeError("Redis client not connected")
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notification_key = self._notification_key(phone_number)
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phone_key = self._phone_to_notification_key(phone_number)
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try:
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logger.info(f"Deleting notification session for phone {phone_number}")
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await self.redis.delete(notification_key)
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await self.redis.delete(phone_key)
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return True
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except Exception as e:
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logger.error(
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f"Error deleting notification session for phone {phone_number}: {str(e)}"
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)
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return False
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