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import json
import logging
import time
import uuid
from typing import Any, Dict, List, Optional
from langchain_openai import ChatOpenAI
from langchain_core.prompts import PromptTemplate
from app.core.config import settings
from app.core.queue import get_redis_client
logger = logging.getLogger(__name__)
SESSION_TTL = 604800 # 7 days in seconds
async def add_session_message(
user_id: str,
session_id: str,
role: str,
content: str,
sources: Optional[List[Dict[str, Any]]] = None,
confidence: Optional[float] = None
) -> None:
try:
redis = await get_redis_client()
key = f"session:{user_id}:{session_id}:messages"
meta_key = f"session:{user_id}:{session_id}:meta"
user_sessions_key = f"user_sessions:{user_id}"
msg = {
"role": role,
"content": content,
"timestamp": time.time(),
"sources": sources or [],
"confidence": confidence
}
await redis.rpush(key, json.dumps(msg))
await redis.expire(key, SESSION_TTL)
# Update session metadata
meta = {
"session_id": session_id,
"user_id": user_id,
"updated_at": time.time(),
"last_preview": content[:60] + "..." if len(content) > 60 else content
}
await redis.setex(meta_key, SESSION_TTL, json.dumps(meta))
# Add to user's list of sessions and global admin list
await redis.zadd(user_sessions_key, {session_id: time.time()})
await redis.expire(user_sessions_key, SESSION_TTL)
await redis.zadd("all_sessions", {f"{user_id}:{session_id}": time.time()})
await redis.expire("all_sessions", SESSION_TTL)
logger.debug(f"Added message to session {session_id} for user {user_id}")
# Trigger background summarization if chat exceeds 6 turns (sliding window)
total_msgs = await redis.llen(key)
if total_msgs > 6:
asyncio.create_task(summarize_session_if_needed(user_id, session_id))
except Exception as e:
logger.warning(f"Failed to add session message to Redis: {e}")
async def get_session_summary(user_id: str, session_id: str) -> Optional[str]:
try:
redis = await get_redis_client()
summary_key = f"session:{user_id}:{session_id}:summary"
raw_summary = await redis.get(summary_key)
if raw_summary:
return raw_summary.decode("utf-8") if isinstance(raw_summary, bytes) else str(raw_summary)
return None
except Exception as e:
logger.warning(f"Failed to get session summary from Redis: {e}")
return None
async def summarize_session_if_needed(user_id: str, session_id: str) -> None:
try:
redis = await get_redis_client()
key = f"session:{user_id}:{session_id}:messages"
summary_key = f"session:{user_id}:{session_id}:summary"
total_len = await redis.llen(key)
if total_len <= 6:
return
# Get older turns (turns 1 through N-6)
older_raw = await redis.lrange(key, 0, -7)
if not older_raw:
return
older_msgs = []
for raw in older_raw:
try:
older_msgs.append(json.loads(raw))
except Exception:
continue
if not older_msgs:
return
old_summary = await get_session_summary(user_id, session_id)
lines = []
if old_summary:
lines.append(f"Previous Summary: {old_summary}")
for m in older_msgs:
lines.append(f"{m.get('role', 'user')}: {m.get('content', '')}")
to_summarize = "\n".join(lines)
llm = ChatOpenAI(
model=getattr(settings, "FAST_LLM_MODEL", settings.LLM_MODEL),
temperature=0,
openai_api_key=getattr(settings, "FAST_LLM_API_KEY", "") or settings.OPENROUTER_API_KEY,
openai_api_base=getattr(settings, "FAST_LLM_BASE_URL", "") or settings.OPENROUTER_BASE_URL,
default_headers={"HTTP-Referer": "https://localhost:3000", "X-Title": "Support Docs Copilot"},
)
prompt = PromptTemplate(
template="""You are a helpful technical conversation summarizer.
Condense the following past conversation turns into a dense, 2-sentence summary capturing the main technical topics, user goals, and key details discussed.
Your output must start exactly with: "System Summary:"
Conversation to summarize:
{text_to_summarize}
Summary:""",
input_variables=["text_to_summarize"],
)
chain = prompt | llm
res = await chain.ainvoke({"text_to_summarize": to_summarize})
summary_text = res.content.strip()
if not summary_text.startswith("System Summary:"):
summary_text = f"System Summary: {summary_text}"
await redis.setex(summary_key, SESSION_TTL, summary_text)
logger.info(f"Generated background conversation summary for session {session_id}")
except Exception as e:
logger.warning(f"Failed to summarize session history in background: {e}")
async def get_session_history(user_id: str, session_id: str, limit: int = 6) -> List[Dict[str, Any]]:
try:
redis = await get_redis_client()
key = f"session:{user_id}:{session_id}:messages"
raw_msgs = await redis.lrange(key, -limit, -1)
if not raw_msgs:
return []
messages = []
for raw in raw_msgs:
try:
msg = json.loads(raw)
messages.append(msg)
except Exception:
continue
return messages
except Exception as e:
logger.warning(f"Failed to get session history from Redis: {e}")
return []
async def list_user_sessions(user_id: str, limit: int = 20) -> List[Dict[str, Any]]:
try:
redis = await get_redis_client()
user_sessions_key = f"user_sessions:{user_id}"
session_ids = await redis.zrevrange(user_sessions_key, 0, limit - 1)
if not session_ids:
return []
sessions = []
for sid_bytes in session_ids:
sid = sid_bytes.decode("utf-8") if isinstance(sid_bytes, bytes) else str(sid_bytes)
meta_key = f"session:{user_id}:{sid}:meta"
raw_meta = await redis.get(meta_key)
if raw_meta:
try:
sessions.append(json.loads(raw_meta))
except Exception:
sessions.append({"session_id": sid, "updated_at": time.time(), "last_preview": "Chat Session"})
else:
sessions.append({"session_id": sid, "updated_at": time.time(), "last_preview": "Chat Session"})
return sessions
except Exception as e:
logger.warning(f"Failed to list user sessions from Redis: {e}")
return []
async def list_all_sessions(limit: int = 50) -> List[Dict[str, Any]]:
try:
redis = await get_redis_client()
entries = await redis.zrevrange("all_sessions", 0, limit - 1)
if not entries:
keys = await redis.keys("user_sessions:*")
sessions = []
for k in keys:
uid = k.decode("utf-8").split(":")[-1] if isinstance(k, bytes) else str(k).split(":")[-1]
user_sess = await list_user_sessions(uid, limit=10)
sessions.extend(user_sess)
sessions.sort(key=lambda x: x.get("updated_at", 0), reverse=True)
return sessions[:limit]
sessions = []
for entry_bytes in entries:
entry_str = entry_bytes.decode("utf-8") if isinstance(entry_bytes, bytes) else str(entry_bytes)
if ":" in entry_str:
uid, sid = entry_str.split(":", 1)
meta_key = f"session:{uid}:{sid}:meta"
raw_meta = await redis.get(meta_key)
if raw_meta:
try:
sessions.append(json.loads(raw_meta))
except Exception:
sessions.append({"session_id": sid, "user_id": uid, "updated_at": time.time(), "last_preview": "Chat Session"})
else:
sessions.append({"session_id": sid, "user_id": uid, "updated_at": time.time(), "last_preview": "Chat Session"})
return sessions
except Exception as e:
logger.warning(f"Failed to list all sessions from Redis: {e}")
return []
async def delete_session(user_id: str, session_id: str) -> bool:
try:
redis = await get_redis_client()
key = f"session:{user_id}:{session_id}:messages"
meta_key = f"session:{user_id}:{session_id}:meta"
summary_key = f"session:{user_id}:{session_id}:summary"
user_sessions_key = f"user_sessions:{user_id}"
await redis.delete(key)
await redis.delete(meta_key)
await redis.delete(summary_key)
await redis.zrem(user_sessions_key, session_id)
await redis.zrem("all_sessions", f"{user_id}:{session_id}")
logger.info(f"Deleted session {session_id} for user {user_id}")
return True
except Exception as e:
logger.warning(f"Failed to delete session {session_id}: {e}")
return False
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