v1.8.3: session pool + sidebar indicators
- SessionPool: LRU cache for SSH/SFTP sessions across server switches - Sidebar: green dot indicators for servers with active sessions - Sidebar: active sessions count label - Terminal: buffer preservation on server switch via get_current_buffer() - FilesTab/TerminalTab: pool integration for session reuse Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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chrome-storm-c442
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core/session_pool.py
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228
core/session_pool.py
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"""
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Session pool for managing SSH and SFTP sessions to avoid reconnecting when switching between servers.
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"""
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import threading
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import time
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from collections import OrderedDict
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from typing import Dict, Optional, Tuple
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from core.ssh_client import ShellSession, SFTPSession
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class SessionData:
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"""Container for session data including the actual sessions and their metadata."""
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def __init__(self, alias: str, server: dict, key_path: str):
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self.alias = alias
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self.server = server
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self.key_path = key_path
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self.shell_session: Optional[ShellSession] = None
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self.sftp_session: Optional[SFTPSession] = None
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self.last_access_time = time.time()
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# State preservation for sessions
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self.terminal_buffer: bytes = b""
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self.remote_path: str = "/"
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self.sudo_mode: bool = False
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def cleanup(self):
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"""Clean up sessions."""
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if self.shell_session:
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self.shell_session.disconnect()
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self.shell_session = None
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if self.sftp_session:
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self.sftp_session.disconnect()
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self.sftp_session = None
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class SessionPool:
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"""
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Manages a pool of SSH/SFTP sessions to keep connections alive when switching between servers.
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Features:
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- Caches sessions per server alias
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- Keeps idle sessions alive with keepalive
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- Maintains session state (terminal buffer, remote path)
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- LRU eviction for max sessions limit
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- Thread-safe operations
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"""
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def __init__(self, max_sessions: int = 5):
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self.max_sessions = max_sessions
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self._sessions: Dict[str, SessionData] = {}
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self._lock = threading.RLock() # Reentrant lock for thread safety
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self._last_used_order = OrderedDict() # Track access order for LRU
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def get_or_create_shell_session(self, alias: str, server: dict, key_path: str) -> Tuple[ShellSession, bool]:
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"""
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Get existing shell session or create a new one.
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Args:
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alias: Server alias
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server: Server configuration dict
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key_path: Path to SSH key
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Returns:
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Tuple of (session, is_new_session)
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"""
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with self._lock:
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# Get or create session data
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if alias not in self._sessions:
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session_data = SessionData(alias, server, key_path)
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self._sessions[alias] = session_data
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else:
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session_data = self._sessions[alias]
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# Update access time for LRU
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self._update_last_access(alias)
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# Create shell session if needed
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if session_data.shell_session is None or not session_data.shell_session.connected:
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shell_session = ShellSession(server, key_path)
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session_data.shell_session = shell_session
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# Restore terminal buffer if we have one
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if session_data.terminal_buffer:
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# We can't directly restore the buffer since terminal handles its own state
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# But we remember the fact that we had buffered data
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pass
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return shell_session, True
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return session_data.shell_session, False
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def get_or_create_sftp_session(self, alias: str, server: dict, key_path: str) -> Tuple[SFTPSession, bool]:
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"""
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Get existing SFTP session or create a new one.
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Args:
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alias: Server alias
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server: Server configuration dict
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key_path: Path to SSH key
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Returns:
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Tuple of (session, is_new_session)
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"""
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with self._lock:
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# Get or create session data
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if alias not in self._sessions:
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session_data = SessionData(alias, server, key_path)
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self._sessions[alias] = session_data
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else:
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session_data = self._sessions[alias]
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# Update access time for LRU
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self._update_last_access(alias)
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# Create SFTP session if needed
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if session_data.sftp_session is None or not session_data.sftp_session.connected:
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sftp_session = SFTPSession(server, key_path)
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session_data.sftp_session = sftp_session
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sftp_session.sudo_mode = session_data.sudo_mode
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return sftp_session, True
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return session_data.sftp_session, False
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def activate_shell_session(self, alias: str, server: dict, key_path: str) -> ShellSession:
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"""
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Activate a shell session for the given alias (or create if needed).
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Updates access time and ensures session is ready.
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"""
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session, _ = self.get_or_create_shell_session(alias, server, key_path)
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with self._lock:
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self._update_last_access(alias)
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return session
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def activate_sftp_session(self, alias: str, server: dict, key_path: str) -> SFTPSession:
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"""
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Activate an SFTP session for the given alias (or create if needed).
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Updates access time and ensures session is ready.
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"""
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session, _ = self.get_or_create_sftp_session(alias, server, key_path)
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with self._lock:
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self._update_last_access(alias)
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# Apply stored state
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session_data = self._sessions[alias]
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session.sudo_mode = session_data.sudo_mode
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return session
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def store_shell_state(self, alias: str, terminal_buffer: bytes):
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"""Store terminal state when switching away from a server."""
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with self._lock:
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if alias in self._sessions:
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self._sessions[alias].terminal_buffer = terminal_buffer
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self._update_last_access(alias)
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def store_sftp_state(self, alias: str, remote_path: str, sudo_mode: bool):
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"""Store SFTP state when switching away from a server."""
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with self._lock:
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if alias in self._sessions:
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session_data = self._sessions[alias]
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session_data.remote_path = remote_path
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session_data.sudo_mode = sudo_mode
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self._update_last_access(alias)
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def get_shell_state(self, alias: str) -> bytes:
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"""Retrieve terminal state when switching back to a server."""
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with self._lock:
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if alias in self._sessions:
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self._update_last_access(alias)
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return self._sessions[alias].terminal_buffer
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return b""
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def get_sftp_state(self, alias: str) -> Tuple[str, bool]:
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"""Retrieve SFTP state when switching back to a server."""
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with self._lock:
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if alias in self._sessions:
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session_data = self._sessions[alias]
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self._update_last_access(alias)
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return session_data.remote_path, session_data.sudo_mode
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return "/", False
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def _update_last_access(self, alias: str):
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"""Update the last access time for the given alias."""
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if alias in self._last_used_order:
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del self._last_used_order[alias]
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self._last_used_order[alias] = time.time()
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# Enforce max sessions limit using LRU
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while len(self._last_used_order) > self.max_sessions:
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oldest_alias, _ = self._last_used_order.popitem(last=False)
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if oldest_alias in self._sessions:
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old_session = self._sessions[oldest_alias]
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old_session.cleanup()
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del self._sessions[oldest_alias]
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def disconnect_session(self, alias: str):
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"""Explicitly disconnect a session."""
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with self._lock:
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if alias in self._sessions:
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session_data = self._sessions[alias]
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session_data.cleanup()
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del self._sessions[alias]
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if alias in self._last_used_order:
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del self._last_used_order[alias]
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def disconnect_all(self):
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"""Disconnect all sessions."""
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with self._lock:
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for session_data in self._sessions.values():
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session_data.cleanup()
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self._sessions.clear()
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self._last_used_order.clear()
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def cleanup_deleted_server(self, alias: str):
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"""Clean up sessions when a server is deleted."""
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self.disconnect_session(alias)
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def get_active_sessions(self) -> list:
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"""Get list of aliases for active sessions."""
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with self._lock:
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active = []
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for alias, session_data in self._sessions.items():
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has_active = (
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(session_data.shell_session and session_data.shell_session.connected) or
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(session_data.sftp_session and session_data.sftp_session.connected)
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)
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if has_active:
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active.append(alias)
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return active
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