File size: 6,406 Bytes
ae279de | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | """Session manager with automatic cleanup for RAG chains"""
import time
import threading
from typing import Optional, Dict, Any
import logging
logger = logging.getLogger(__name__)
class SessionManager:
"""Manages RAG chains with automatic cleanup and TTL"""
def __init__(self, ttl_seconds: int = 86400):
"""
Initialize SessionManager
Args:
ttl_seconds: Time-to-live for sessions in seconds (default: 24 hours)
"""
self.sessions: Dict[str, dict] = {}
self.ttl = ttl_seconds
self.lock = threading.Lock()
# Start cleanup thread
self.cleanup_thread = threading.Thread(
target=self._cleanup_loop,
daemon=True
)
self.cleanup_thread.start()
logger.info(f"SessionManager initialized with TTL={ttl_seconds}s")
def create_session(self, session_id: str, rag_chain: Any, metadata: dict = None) -> str:
"""
Create a new session with automatic expiry
Args:
session_id: Unique session identifier
rag_chain: RAG chain object to store
metadata: Optional metadata dictionary
Returns:
session_id for verification
"""
with self.lock:
self.sessions[session_id] = {
'chain': rag_chain,
'created_at': time.time(),
'last_accessed': time.time(),
'metadata': metadata or {},
'access_count': 0
}
logger.info(f"Session created: {session_id}. Total: {len(self.sessions)}")
return session_id
def get_session(self, session_id: str) -> Optional[Any]:
"""
Retrieve a session and update access time
Args:
session_id: Session to retrieve
Returns:
RAG chain object or None if not found
"""
with self.lock:
if session_id not in self.sessions:
return None
session_data = self.sessions[session_id]
session_data['last_accessed'] = time.time()
session_data['access_count'] += 1
return session_data['chain']
def delete_session(self, session_id: str) -> bool:
"""
Manually delete a session
Args:
session_id: Session to delete
Returns:
True if deleted, False if not found
"""
with self.lock:
if session_id in self.sessions:
del self.sessions[session_id]
logger.info(f"Session deleted: {session_id}. Remaining: {len(self.sessions)}")
return True
return False
def get_session_count(self) -> int:
"""Get number of active sessions"""
with self.lock:
return len(self.sessions)
def get_session_info(self, session_id: str) -> Optional[dict]:
"""
Get detailed session information
Args:
session_id: Session to query
Returns:
Dictionary with session metadata or None
"""
with self.lock:
if session_id not in self.sessions:
return None
session_data = self.sessions[session_id]
current_time = time.time()
return {
'session_id': session_id,
'created_at': session_data['created_at'],
'last_accessed': session_data['last_accessed'],
'access_count': session_data['access_count'],
'age_seconds': current_time - session_data['created_at'],
'idle_seconds': current_time - session_data['last_accessed'],
'ttl_seconds': self.ttl,
'expires_at': session_data['created_at'] + self.ttl,
}
def get_all_sessions_info(self) -> list:
"""Get information about all active sessions"""
with self.lock:
return [self.get_session_info(sid) for sid in self.sessions.keys()]
def _cleanup_loop(self):
"""Background cleanup thread that runs periodically"""
while True:
try:
time.sleep(300) # Check every 5 minutes
self._cleanup_expired_sessions()
except Exception as e:
logger.error(f"Cleanup loop error: {e}")
def _cleanup_expired_sessions(self):
"""Remove sessions that have exceeded their TTL"""
current_time = time.time()
expired = []
with self.lock:
for session_id, session_data in list(self.sessions.items()):
age = current_time - session_data['created_at']
if age > self.ttl:
expired.append(session_id)
# Remove expired sessions
for session_id in expired:
del self.sessions[session_id]
logger.info(f"Expired session: {session_id}")
if expired:
logger.info(f"Cleaned {len(expired)} expired sessions. Active: {len(self.sessions)}")
def cleanup_all(self):
"""Clear all sessions (typically called on shutdown)"""
with self.lock:
count = len(self.sessions)
self.sessions.clear()
logger.info(f"Cleaned up all {count} sessions")
def get_memory_stats(self) -> dict:
"""Get memory statistics"""
with self.lock:
total_age = 0
total_idle = 0
total_accesses = 0
current_time = time.time()
for session_data in self.sessions.values():
total_age += current_time - session_data['created_at']
total_idle += current_time - session_data['last_accessed']
total_accesses += session_data['access_count']
count = len(self.sessions)
return {
'total_sessions': count,
'avg_age_seconds': total_age / count if count > 0 else 0,
'avg_idle_seconds': total_idle / count if count > 0 else 0,
'total_accesses': total_accesses,
'ttl_seconds': self.ttl,
}
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