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"""
Session Tracker Module
Manages and tracks all network sessions across the virtual ISP stack:
- Unified session management across all modules
- Session lifecycle tracking
- Performance metrics and analytics
- Session correlation and debugging
"""
import time
import threading
import uuid
from typing import Dict, List, Optional, Set, Any, Tuple
from dataclasses import dataclass, field
from enum import Enum
import json
from .tcp_engine import TCPConnection
from .nat_engine import NATSession
class SessionType(Enum):
NAT_SESSION = "NAT_SESSION"
TCP_CONNECTION = "TCP_CONNECTION"
SOCKET_CONNECTION = "SOCKET_CONNECTION"
class SessionState(Enum):
INITIALIZING = "INITIALIZING"
ACTIVE = "ACTIVE"
IDLE = "IDLE"
CLOSING = "CLOSING"
CLOSED = "CLOSED"
ERROR = "ERROR"
@dataclass
class SessionMetrics:
"""Session performance metrics"""
bytes_in: int = 0
bytes_out: int = 0
packets_in: int = 0
packets_out: int = 0
errors: int = 0
retransmits: int = 0
rtt_samples: List[float] = field(default_factory=list)
@property
def total_bytes(self) -> int:
return self.bytes_in + self.bytes_out
@property
def total_packets(self) -> int:
return self.packets_in + self.packets_out
@property
def average_rtt(self) -> float:
return sum(self.rtt_samples) / len(self.rtt_samples) if self.rtt_samples else 0.0
def update_bytes(self, bytes_in: int = 0, bytes_out: int = 0):
"""Update byte counters"""
self.bytes_in += bytes_in
self.bytes_out += bytes_out
def update_packets(self, packets_in: int = 0, packets_out: int = 0):
"""Update packet counters"""
self.packets_in += packets_in
self.packets_out += packets_out
def add_rtt_sample(self, rtt: float):
"""Add RTT sample"""
self.rtt_samples.append(rtt)
# Keep only last 100 samples
if len(self.rtt_samples) > 100:
self.rtt_samples = self.rtt_samples[-100:]
def to_dict(self) -> Dict:
"""Convert to dictionary"""
return {
'bytes_in': self.bytes_in,
'bytes_out': self.bytes_out,
'packets_in': self.packets_in,
'packets_out': self.packets_out,
'total_bytes': self.total_bytes,
'total_packets': self.total_packets,
'errors': self.errors,
'retransmits': self.retransmits,
'average_rtt': self.average_rtt,
'rtt_samples_count': len(self.rtt_samples)
}
@dataclass
class UnifiedSession:
"""Unified session representation"""
id: str
type: SessionType
state: SessionState
start_time: float
last_active: float
source_ip: str
source_port: int
dest_ip: str
dest_port: int
metrics: SessionMetrics = field(default_factory=SessionMetrics)
metadata: Dict[str, Any] = field(default_factory=dict)
@property
def duration(self) -> float:
"""Get session duration"""
return time.time() - self.start_time
@property
def idle_time(self) -> float:
"""Get idle time"""
return time.time() - self.last_active
def update_activity(self):
"""Update last activity timestamp"""
self.last_active = time.time()
def to_dict(self) -> Dict:
"""Convert to dictionary"""
return {
'id': self.id,
'type': self.type.value,
'state': self.state.value,
'start_time': self.start_time,
'last_active': self.last_active,
'duration': self.duration,
'idle_time': self.idle_time,
'source_ip': self.source_ip,
'source_port': self.source_port,
'dest_ip': self.dest_ip,
'dest_port': self.dest_port,
'metrics': self.metrics.to_dict(),
'metadata': self.metadata
}
class SessionTracker:
"""Tracks all active network sessions"""
_instance = None
_lock = threading.Lock()
def __new__(cls):
with cls._lock:
if cls._instance is None:
cls._instance = super().__new__(cls)
cls._instance._initialized = False
return cls._instance
def __init__(self):
if self._initialized:
return
self.sessions: Dict[str, UnifiedSession] = {}
self.lock = threading.Lock()
self.cleanup_thread = threading.Thread(target=self._cleanup_loop)
self.cleanup_thread.daemon = True
self.running = True
self.cleanup_thread.start()
self._initialized = True
def create_session(self, session_type: SessionType, source_ip: str,
source_port: int, dest_ip: str, dest_port: int,
**kwargs) -> UnifiedSession:
"""Create a new session"""
session = UnifiedSession(
id=str(uuid.uuid4()),
type=session_type,
state=SessionState.INITIALIZING,
start_time=time.time(),
last_active=time.time(),
source_ip=source_ip,
source_port=source_port,
dest_ip=dest_ip,
dest_port=dest_port,
metadata=kwargs
)
with self.lock:
self.sessions[session.id] = session
return session
def get_session(self, session_id: str) -> Optional[UnifiedSession]:
"""Get session by ID"""
return self.sessions.get(session_id)
def update_session(self, session_id: str, state: Optional[SessionState] = None,
metrics_update: Optional[Dict] = None,
metadata_update: Optional[Dict] = None) -> bool:
"""Update session state and metrics"""
session = self.get_session(session_id)
if not session:
return False
with self.lock:
if state:
session.state = state
if metrics_update:
session.metrics.update_bytes(
metrics_update.get('bytes_in', 0),
metrics_update.get('bytes_out', 0)
)
session.metrics.update_packets(
metrics_update.get('packets_in', 0),
metrics_update.get('packets_out', 0)
)
if 'rtt' in metrics_update:
session.metrics.add_rtt_sample(metrics_update['rtt'])
if metadata_update:
session.metadata.update(metadata_update)
session.update_activity()
return True
def close_session(self, session_id: str):
"""Close a session"""
session = self.get_session(session_id)
if session:
with self.lock:
session.state = SessionState.CLOSED
def get_all_sessions(self) -> List[UnifiedSession]:
"""Get all active sessions"""
with self.lock:
return [s for s in self.sessions.values()
if s.state != SessionState.CLOSED]
def get_sessions_by_type(self, session_type: SessionType) -> List[UnifiedSession]:
"""Get sessions by type"""
with self.lock:
return [s for s in self.sessions.values()
if s.type == session_type and s.state != SessionState.CLOSED]
def get_sessions_by_ip(self, ip_address: str) -> List[UnifiedSession]:
"""Get sessions by IP address"""
with self.lock:
return [s for s in self.sessions.values()
if (s.source_ip == ip_address or s.dest_ip == ip_address)
and s.state != SessionState.CLOSED]
def _cleanup_loop(self):
"""Background cleanup loop"""
while self.running:
time.sleep(60) # Run every minute
try:
self._cleanup_sessions()
except Exception as e:
print(f"Error in cleanup loop: {e}")
def _cleanup_sessions(self):
"""Clean up old sessions"""
current_time = time.time()
to_remove = []
with self.lock:
for session_id, session in self.sessions.items():
# Remove closed sessions after 5 minutes
if (session.state == SessionState.CLOSED and
current_time - session.last_active > 300):
to_remove.append(session_id)
# Remove idle sessions after 30 minutes
elif (session.state != SessionState.CLOSED and
current_time - session.last_active > 1800):
session.state = SessionState.CLOSED
to_remove.append(session_id)
for session_id in to_remove:
del self.sessions[session_id]
def shutdown(self):
"""Shutdown the tracker"""
self.running = False
if self.cleanup_thread.is_alive():
self.cleanup_thread.join()
with self.lock:
self.sessions.clear()
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