fix: persist ACP sessions to SessionDB so they survive process restarts
* fix: persist ACP sessions to disk so they survive process restarts The ACP adapter stored sessions entirely in-memory. When the editor restarted the ACP subprocess (idle timeout, crash, system sleep/wake, editor restart), all sessions were lost. The editor's load_session / resume_session calls would fail to find the session, forcing a new empty session and losing all conversation history. Changes: - SessionManager now persists each session as a JSON file under ~/.hermes/acp_sessions/<session_id>.json - get_session() transparently restores from disk when not in memory - update_cwd(), fork_session(), list_sessions() all check disk - server.py calls save_session() after prompt completion, /reset, /compact, and model switches - cleanup() and remove_session() delete disk files too - Sessions have a 7-day TTL; expired sessions are pruned on startup - Atomic writes via tempfile + os.replace to prevent corruption - 11 new tests covering persistence, disk restoration, and TTL expiry * refactor: use SessionDB instead of JSON files for ACP session persistence Replace the standalone JSON file persistence layer with SessionDB (~/.hermes/state.db) integration. ACP sessions now: - Share the same DB as CLI and gateway sessions - Are searchable via session_search (FTS5) - Get token tracking, cost tracking, and session titles for free - Follow existing session pruning policies Key changes: - _get_db() lazily creates a SessionDB, resolving HERMES_HOME dynamically (not at import time) for test compatibility - _persist() creates session record + replaces messages in DB - _restore() loads from DB with source='acp' filter - cwd stored in model_config JSON field (no schema migration) - Model values coerced to str to handle mock agents in tests - Removed: json files, sessions_dir, ttl_days, _expire logic - Tests updated: DB-backed persistence, FTS search, tool_call round-tripping, source filtering --------- Co-authored-by: Test <test@test.com>
This commit is contained in:
Teknium
@@ -304,6 +304,8 @@ class HermesACPAgent(acp.Agent):
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if result.get("messages"):
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state.history = result["messages"]
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# Persist updated history so sessions survive process restarts.
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self.session_manager.save_session(session_id)
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final_response = result.get("final_response", "")
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if final_response and conn:
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@@ -400,6 +402,7 @@ class HermesACPAgent(acp.Agent):
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cwd=state.cwd,
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model=new_model,
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)
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self.session_manager.save_session(state.session_id)
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provider_label = target_provider or getattr(state.agent, "provider", "auto")
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logger.info("Session %s: model switched to %s", state.session_id, new_model)
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return f"Model switched to: {new_model}\nProvider: {provider_label}"
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@@ -444,6 +447,7 @@ class HermesACPAgent(acp.Agent):
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def _cmd_reset(self, args: str, state: SessionState) -> str:
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state.history.clear()
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self.session_manager.save_session(state.session_id)
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return "Conversation history cleared."
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def _cmd_compact(self, args: str, state: SessionState) -> str:
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@@ -453,6 +457,7 @@ class HermesACPAgent(acp.Agent):
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agent = state.agent
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if hasattr(agent, "compress_context"):
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agent.compress_context(state.history)
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self.session_manager.save_session(state.session_id)
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return f"Context compressed. Messages: {len(state.history)}"
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return "Context compression not available for this agent."
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except Exception as e:
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@@ -475,5 +480,6 @@ class HermesACPAgent(acp.Agent):
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cwd=state.cwd,
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model=model_id,
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)
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self.session_manager.save_session(session_id)
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logger.info("Session %s: model switched to %s", session_id, model_id)
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return None
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@@ -1,7 +1,15 @@
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"""ACP session manager — maps ACP sessions to Hermes AIAgent instances."""
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"""ACP session manager — maps ACP sessions to Hermes AIAgent instances.
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Sessions are persisted to the shared SessionDB (``~/.hermes/state.db``) so they
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survive process restarts and appear in ``session_search``. When the editor
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reconnects after idle/restart, the ``load_session`` / ``resume_session`` calls
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find the persisted session in the database and restore the full conversation
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history.
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"""
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from __future__ import annotations
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import copy
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import json
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import logging
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import uuid
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from dataclasses import dataclass, field
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@@ -46,18 +54,26 @@ class SessionState:
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class SessionManager:
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"""Thread-safe manager for ACP sessions backed by Hermes AIAgent instances."""
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"""Thread-safe manager for ACP sessions backed by Hermes AIAgent instances.
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def __init__(self, agent_factory=None):
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Sessions are held in-memory for fast access **and** persisted to the
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shared SessionDB so they survive process restarts and are searchable
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via ``session_search``.
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"""
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def __init__(self, agent_factory=None, db=None):
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"""
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Args:
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agent_factory: Optional callable that creates an AIAgent-like object.
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Used by tests. When omitted, a real AIAgent is created
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using the current Hermes runtime provider configuration.
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db: Optional SessionDB instance. When omitted, the default
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SessionDB (``~/.hermes/state.db``) is lazily created.
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"""
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self._sessions: Dict[str, SessionState] = {}
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self._lock = Lock()
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self._agent_factory = agent_factory
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self._db_instance = db # None → lazy-init on first use
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# ---- public API ---------------------------------------------------------
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@@ -77,54 +93,67 @@ class SessionManager:
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with self._lock:
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self._sessions[session_id] = state
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_register_task_cwd(session_id, cwd)
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self._persist(state)
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logger.info("Created ACP session %s (cwd=%s)", session_id, cwd)
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return state
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def get_session(self, session_id: str) -> Optional[SessionState]:
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"""Return the session for *session_id*, or ``None``."""
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"""Return the session for *session_id*, or ``None``.
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If the session is not in memory but exists in the database (e.g. after
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a process restart), it is transparently restored.
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"""
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with self._lock:
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return self._sessions.get(session_id)
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state = self._sessions.get(session_id)
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if state is not None:
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return state
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# Attempt to restore from database.
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return self._restore(session_id)
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def remove_session(self, session_id: str) -> bool:
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"""Remove a session. Returns True if it existed."""
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"""Remove a session from memory and database. Returns True if it existed."""
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with self._lock:
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existed = self._sessions.pop(session_id, None) is not None
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if existed:
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db_existed = self._delete_persisted(session_id)
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if existed or db_existed:
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_clear_task_cwd(session_id)
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return existed
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return existed or db_existed
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def fork_session(self, session_id: str, cwd: str = ".") -> Optional[SessionState]:
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"""Deep-copy a session's history into a new session."""
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import threading
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with self._lock:
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original = self._sessions.get(session_id)
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if original is None:
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return None
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original = self.get_session(session_id) # checks DB too
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if original is None:
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return None
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new_id = str(uuid.uuid4())
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agent = self._make_agent(
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session_id=new_id,
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cwd=cwd,
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model=original.model or None,
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)
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state = SessionState(
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session_id=new_id,
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agent=agent,
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cwd=cwd,
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model=getattr(agent, "model", original.model) or original.model,
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history=copy.deepcopy(original.history),
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cancel_event=threading.Event(),
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)
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new_id = str(uuid.uuid4())
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agent = self._make_agent(
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session_id=new_id,
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cwd=cwd,
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model=original.model or None,
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)
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state = SessionState(
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session_id=new_id,
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agent=agent,
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cwd=cwd,
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model=getattr(agent, "model", original.model) or original.model,
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history=copy.deepcopy(original.history),
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cancel_event=threading.Event(),
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)
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with self._lock:
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self._sessions[new_id] = state
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_register_task_cwd(new_id, cwd)
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self._persist(state)
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logger.info("Forked ACP session %s -> %s", session_id, new_id)
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return state
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def list_sessions(self) -> List[Dict[str, Any]]:
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"""Return lightweight info dicts for all sessions."""
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"""Return lightweight info dicts for all sessions (memory + database)."""
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# Collect in-memory sessions first.
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with self._lock:
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return [
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seen_ids = set(self._sessions.keys())
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results = [
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{
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"session_id": s.session_id,
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"cwd": s.cwd,
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@@ -134,23 +163,220 @@ class SessionManager:
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for s in self._sessions.values()
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]
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# Merge any persisted sessions not currently in memory.
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db = self._get_db()
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if db is not None:
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try:
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rows = db.search_sessions(source="acp", limit=1000)
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for row in rows:
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sid = row["id"]
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if sid in seen_ids:
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continue
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# Extract cwd from model_config JSON.
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cwd = "."
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mc = row.get("model_config")
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if mc:
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try:
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cwd = json.loads(mc).get("cwd", ".")
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except (json.JSONDecodeError, TypeError):
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pass
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results.append({
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"session_id": sid,
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"cwd": cwd,
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"model": row.get("model") or "",
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"history_len": row.get("message_count") or 0,
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})
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except Exception:
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logger.debug("Failed to list ACP sessions from DB", exc_info=True)
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return results
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def update_cwd(self, session_id: str, cwd: str) -> Optional[SessionState]:
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"""Update the working directory for a session and its tool overrides."""
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with self._lock:
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state = self._sessions.get(session_id)
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if state is None:
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return None
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state.cwd = cwd
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state = self.get_session(session_id) # checks DB too
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if state is None:
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return None
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state.cwd = cwd
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_register_task_cwd(session_id, cwd)
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self._persist(state)
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return state
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def cleanup(self) -> None:
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"""Remove all sessions and clear task-specific cwd overrides."""
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"""Remove all sessions (memory and database) and clear task-specific cwd overrides."""
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with self._lock:
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session_ids = list(self._sessions.keys())
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self._sessions.clear()
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for session_id in session_ids:
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_clear_task_cwd(session_id)
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self._delete_persisted(session_id)
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# Also remove any DB-only ACP sessions not currently in memory.
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db = self._get_db()
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if db is not None:
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try:
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rows = db.search_sessions(source="acp", limit=10000)
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for row in rows:
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sid = row["id"]
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_clear_task_cwd(sid)
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db.delete_session(sid)
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except Exception:
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logger.debug("Failed to cleanup ACP sessions from DB", exc_info=True)
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def save_session(self, session_id: str) -> None:
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"""Persist the current state of a session to the database.
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Called by the server after prompt completion, slash commands that
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mutate history, and model switches.
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"""
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with self._lock:
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state = self._sessions.get(session_id)
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if state is not None:
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self._persist(state)
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# ---- persistence via SessionDB ------------------------------------------
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def _get_db(self):
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"""Lazily initialise and return the SessionDB instance.
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Returns ``None`` if the DB is unavailable (e.g. import error in a
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minimal test environment).
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Note: we resolve ``HERMES_HOME`` dynamically rather than relying on
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the module-level ``DEFAULT_DB_PATH`` constant, because that constant
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is evaluated at import time and won't reflect env-var changes made
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later (e.g. by the test fixture ``_isolate_hermes_home``).
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"""
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if self._db_instance is not None:
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return self._db_instance
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try:
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import os
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from pathlib import Path
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from hermes_state import SessionDB
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hermes_home = Path(os.getenv("HERMES_HOME", Path.home() / ".hermes"))
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self._db_instance = SessionDB(db_path=hermes_home / "state.db")
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return self._db_instance
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except Exception:
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logger.debug("SessionDB unavailable for ACP persistence", exc_info=True)
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return None
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def _persist(self, state: SessionState) -> None:
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"""Write session state to the database.
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Creates the session record if it doesn't exist, then replaces all
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stored messages with the current in-memory history.
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"""
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db = self._get_db()
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if db is None:
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return
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# Ensure model is a plain string (not a MagicMock or other proxy).
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model_str = str(state.model) if state.model else None
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cwd_json = json.dumps({"cwd": state.cwd})
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try:
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# Ensure the session record exists.
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existing = db.get_session(state.session_id)
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if existing is None:
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db.create_session(
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session_id=state.session_id,
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source="acp",
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model=model_str,
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model_config={"cwd": state.cwd},
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)
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else:
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# Update model_config (contains cwd) if changed.
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try:
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with db._lock:
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db._conn.execute(
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"UPDATE sessions SET model_config = ?, model = COALESCE(?, model) WHERE id = ?",
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(cwd_json, model_str, state.session_id),
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)
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db._conn.commit()
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except Exception:
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logger.debug("Failed to update ACP session metadata", exc_info=True)
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# Replace stored messages with current history.
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db.clear_messages(state.session_id)
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for msg in state.history:
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db.append_message(
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session_id=state.session_id,
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role=msg.get("role", "user"),
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content=msg.get("content"),
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tool_name=msg.get("tool_name") or msg.get("name"),
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tool_calls=msg.get("tool_calls"),
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tool_call_id=msg.get("tool_call_id"),
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)
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except Exception:
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logger.warning("Failed to persist ACP session %s", state.session_id, exc_info=True)
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def _restore(self, session_id: str) -> Optional[SessionState]:
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"""Load a session from the database into memory, recreating the AIAgent."""
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import threading
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db = self._get_db()
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if db is None:
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return None
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try:
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row = db.get_session(session_id)
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except Exception:
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logger.debug("Failed to query DB for ACP session %s", session_id, exc_info=True)
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return None
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if row is None:
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return None
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# Only restore ACP sessions.
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if row.get("source") != "acp":
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return None
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# Extract cwd from model_config.
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cwd = "."
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mc = row.get("model_config")
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if mc:
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try:
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cwd = json.loads(mc).get("cwd", ".")
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except (json.JSONDecodeError, TypeError):
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pass
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model = row.get("model") or None
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# Load conversation history.
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try:
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history = db.get_messages_as_conversation(session_id)
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except Exception:
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logger.warning("Failed to load messages for ACP session %s", session_id, exc_info=True)
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history = []
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try:
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agent = self._make_agent(session_id=session_id, cwd=cwd, model=model)
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except Exception:
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logger.warning("Failed to recreate agent for ACP session %s", session_id, exc_info=True)
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return None
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state = SessionState(
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session_id=session_id,
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agent=agent,
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cwd=cwd,
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model=model or getattr(agent, "model", "") or "",
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history=history,
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cancel_event=threading.Event(),
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)
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with self._lock:
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self._sessions[session_id] = state
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_register_task_cwd(session_id, cwd)
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logger.info("Restored ACP session %s from DB (%d messages)", session_id, len(history))
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return state
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def _delete_persisted(self, session_id: str) -> bool:
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"""Delete a session from the database. Returns True if it existed."""
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db = self._get_db()
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if db is None:
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return False
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try:
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return db.delete_session(session_id)
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except Exception:
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logger.debug("Failed to delete ACP session %s from DB", session_id, exc_info=True)
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return False
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# ---- internal -----------------------------------------------------------
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@@ -1,15 +1,21 @@
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"""Tests for acp_adapter.session — SessionManager and SessionState."""
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import json
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import pytest
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from unittest.mock import MagicMock
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|
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from acp_adapter.session import SessionManager, SessionState
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from hermes_state import SessionDB
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|
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def _mock_agent():
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return MagicMock(name="MockAIAgent")
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@pytest.fixture()
|
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def manager():
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"""SessionManager with a mock agent factory (avoids needing API keys)."""
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return SessionManager(agent_factory=lambda: MagicMock(name="MockAIAgent"))
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return SessionManager(agent_factory=_mock_agent)
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# ---------------------------------------------------------------------------
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@@ -110,3 +116,168 @@ class TestListAndCleanup:
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assert manager.get_session(state.session_id) is None
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# Removing again returns False
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assert manager.remove_session(state.session_id) is False
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|
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|
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# ---------------------------------------------------------------------------
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# persistence — sessions survive process restarts (via SessionDB)
|
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# ---------------------------------------------------------------------------
|
||||
|
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|
||||
class TestPersistence:
|
||||
"""Verify that sessions are persisted to SessionDB and can be restored."""
|
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|
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def test_create_session_writes_to_db(self, manager):
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state = manager.create_session(cwd="/project")
|
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db = manager._get_db()
|
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assert db is not None
|
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row = db.get_session(state.session_id)
|
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assert row is not None
|
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assert row["source"] == "acp"
|
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# cwd stored in model_config JSON
|
||||
mc = json.loads(row["model_config"])
|
||||
assert mc["cwd"] == "/project"
|
||||
|
||||
def test_get_session_restores_from_db(self, manager):
|
||||
"""Simulate process restart: create session, drop from memory, get again."""
|
||||
state = manager.create_session(cwd="/work")
|
||||
state.history.append({"role": "user", "content": "hello"})
|
||||
state.history.append({"role": "assistant", "content": "hi there"})
|
||||
manager.save_session(state.session_id)
|
||||
|
||||
sid = state.session_id
|
||||
|
||||
# Drop from in-memory store (simulates process restart).
|
||||
with manager._lock:
|
||||
del manager._sessions[sid]
|
||||
|
||||
# get_session should transparently restore from DB.
|
||||
restored = manager.get_session(sid)
|
||||
assert restored is not None
|
||||
assert restored.session_id == sid
|
||||
assert restored.cwd == "/work"
|
||||
assert len(restored.history) == 2
|
||||
assert restored.history[0]["content"] == "hello"
|
||||
assert restored.history[1]["content"] == "hi there"
|
||||
# Agent should have been recreated.
|
||||
assert restored.agent is not None
|
||||
|
||||
def test_save_session_updates_db(self, manager):
|
||||
state = manager.create_session()
|
||||
state.history.append({"role": "user", "content": "test"})
|
||||
manager.save_session(state.session_id)
|
||||
|
||||
db = manager._get_db()
|
||||
messages = db.get_messages_as_conversation(state.session_id)
|
||||
assert len(messages) == 1
|
||||
assert messages[0]["content"] == "test"
|
||||
|
||||
def test_remove_session_deletes_from_db(self, manager):
|
||||
state = manager.create_session()
|
||||
db = manager._get_db()
|
||||
assert db.get_session(state.session_id) is not None
|
||||
manager.remove_session(state.session_id)
|
||||
assert db.get_session(state.session_id) is None
|
||||
|
||||
def test_cleanup_removes_all_from_db(self, manager):
|
||||
s1 = manager.create_session()
|
||||
s2 = manager.create_session()
|
||||
db = manager._get_db()
|
||||
assert db.get_session(s1.session_id) is not None
|
||||
assert db.get_session(s2.session_id) is not None
|
||||
manager.cleanup()
|
||||
assert db.get_session(s1.session_id) is None
|
||||
assert db.get_session(s2.session_id) is None
|
||||
|
||||
def test_list_sessions_includes_db_only(self, manager):
|
||||
"""Sessions only in DB (not in memory) appear in list_sessions."""
|
||||
state = manager.create_session(cwd="/db-only")
|
||||
sid = state.session_id
|
||||
|
||||
# Drop from memory.
|
||||
with manager._lock:
|
||||
del manager._sessions[sid]
|
||||
|
||||
listing = manager.list_sessions()
|
||||
ids = {s["session_id"] for s in listing}
|
||||
assert sid in ids
|
||||
|
||||
def test_fork_restores_source_from_db(self, manager):
|
||||
"""Forking a session that is only in DB should work."""
|
||||
original = manager.create_session()
|
||||
original.history.append({"role": "user", "content": "context"})
|
||||
manager.save_session(original.session_id)
|
||||
|
||||
# Drop original from memory.
|
||||
with manager._lock:
|
||||
del manager._sessions[original.session_id]
|
||||
|
||||
forked = manager.fork_session(original.session_id, cwd="/fork")
|
||||
assert forked is not None
|
||||
assert len(forked.history) == 1
|
||||
assert forked.history[0]["content"] == "context"
|
||||
assert forked.session_id != original.session_id
|
||||
|
||||
def test_update_cwd_restores_from_db(self, manager):
|
||||
state = manager.create_session(cwd="/old")
|
||||
sid = state.session_id
|
||||
|
||||
with manager._lock:
|
||||
del manager._sessions[sid]
|
||||
|
||||
updated = manager.update_cwd(sid, "/new")
|
||||
assert updated is not None
|
||||
assert updated.cwd == "/new"
|
||||
|
||||
# Should also be persisted in DB.
|
||||
db = manager._get_db()
|
||||
row = db.get_session(sid)
|
||||
mc = json.loads(row["model_config"])
|
||||
assert mc["cwd"] == "/new"
|
||||
|
||||
def test_only_restores_acp_sessions(self, manager):
|
||||
"""get_session should not restore non-ACP sessions from DB."""
|
||||
db = manager._get_db()
|
||||
# Manually create a CLI session in the DB.
|
||||
db.create_session(session_id="cli-session-123", source="cli", model="test")
|
||||
# Should not be found via ACP SessionManager.
|
||||
assert manager.get_session("cli-session-123") is None
|
||||
|
||||
def test_sessions_searchable_via_fts(self, manager):
|
||||
"""ACP sessions stored in SessionDB are searchable via FTS5."""
|
||||
state = manager.create_session()
|
||||
state.history.append({"role": "user", "content": "how do I configure nginx"})
|
||||
state.history.append({"role": "assistant", "content": "Here is the nginx config..."})
|
||||
manager.save_session(state.session_id)
|
||||
|
||||
db = manager._get_db()
|
||||
results = db.search_messages("nginx")
|
||||
assert len(results) > 0
|
||||
session_ids = {r["session_id"] for r in results}
|
||||
assert state.session_id in session_ids
|
||||
|
||||
def test_tool_calls_persisted(self, manager):
|
||||
"""Messages with tool_calls should round-trip through the DB."""
|
||||
state = manager.create_session()
|
||||
state.history.append({
|
||||
"role": "assistant",
|
||||
"content": None,
|
||||
"tool_calls": [{"id": "tc_1", "type": "function",
|
||||
"function": {"name": "terminal", "arguments": "{}"}}],
|
||||
})
|
||||
state.history.append({
|
||||
"role": "tool",
|
||||
"content": "output here",
|
||||
"tool_call_id": "tc_1",
|
||||
"name": "terminal",
|
||||
})
|
||||
manager.save_session(state.session_id)
|
||||
|
||||
# Drop from memory, restore from DB.
|
||||
with manager._lock:
|
||||
del manager._sessions[state.session_id]
|
||||
|
||||
restored = manager.get_session(state.session_id)
|
||||
assert restored is not None
|
||||
assert len(restored.history) == 2
|
||||
assert restored.history[0].get("tool_calls") is not None
|
||||
assert restored.history[1].get("tool_call_id") == "tc_1"
|
||||
|
||||
Reference in New Issue
Block a user