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import threading
import uuid
import time
from typing import Optional, Any, Dict, List
from deepforest_agent.utils.cache_utils import tool_call_cache
class SessionStateManager:
"""
Session-based state manager with thread ID for the DeepForest Agent.
This class manages state for multiple concurrent users with each user
having their own session containing current image, conversation
history, and session information.
Attributes:
_lock (threading.Lock): Thread synchronization lock
_sessions (Dict[str, Dict[str, Any]]): Dictionary mapping session_ids to session state
_cleanup_interval (int): Time in seconds after which inactive sessions are cleaned up
"""
def __init__(self, cleanup_interval: int = 3600) -> None:
"""
Initialize the session state manager.
Args:
cleanup_interval (int): Time in seconds after which inactive sessions
are eligible for cleanup (default: 1 hour)
"""
self._lock = threading.Lock()
self._sessions = {}
self._cleanup_interval = cleanup_interval
def create_session(self, image: Any = None) -> str:
"""
Create a new session with initial image.
Args:
image (Any, optional): Initial image for the session
Returns:
str: Unique session ID
"""
session_id = str(uuid.uuid4())[:12]
with self._lock:
self._sessions[session_id] = {
"current_image": image,
"conversation_history": [],
"annotated_image": None,
"thread_id": session_id,
"first_message": True,
"created_at": time.time(),
"last_accessed": time.time(),
"is_cancelled": False,
"is_processing": False,
"tool_call_history": [],
"visual_analysis_history": []
}
return session_id
def get_session_state(self, session_id: str) -> Dict[str, Any]:
"""
Get complete state for a specific session.
Args:
session_id (str): The session ID to retrieve
Returns:
Dict[str, Any]: Copy of session state dictionary
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id]["last_accessed"] = time.time()
# Return a copy to prevent external modification
return self._sessions[session_id].copy()
def get(self, session_id: str, key: str, default: Any = None) -> Any:
"""
Get a value from session state.
Args:
session_id (str): The session ID
key (str): The state key to retrieve
default (Any, optional): Default value if key not found.
Returns:
Any: The value associated with the key, or default if not found
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id]["last_accessed"] = time.time()
return self._sessions[session_id].get(key, default)
def set(self, session_id: str, key: str, value: Any) -> None:
"""
Set a value in session state.
Args:
session_id (str): The session ID
key (str): The state key to set
value (Any): The value to store
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id][key] = value
self._sessions[session_id]["last_accessed"] = time.time()
def update(self, session_id: str, updates: Dict[str, Any]) -> None:
"""
Update multiple values in session state.
Args:
session_id (str): The session ID
updates (Dict[str, Any]): Dictionary of key-value pairs to update
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id].update(updates)
self._sessions[session_id]["last_accessed"] = time.time()
def set_processing_state(self, session_id: str, is_processing: bool) -> None:
"""
Set processing state for a session.
Args:
session_id (str): The session ID
is_processing (bool): Whether processing is active
"""
with self._lock:
if session_id in self._sessions:
self._sessions[session_id]["is_processing"] = is_processing
self._sessions[session_id]["last_accessed"] = time.time()
def cancel_session(self, session_id: str) -> None:
"""
Cancel processing for a session.
Args:
session_id (str): The session ID to cancel
"""
with self._lock:
if session_id in self._sessions:
self._sessions[session_id]["is_cancelled"] = True
self._sessions[session_id]["is_processing"] = False
self._sessions[session_id]["last_accessed"] = time.time()
def is_cancelled(self, session_id: str) -> bool:
"""
Check if session is cancelled.
Args:
session_id (str): The session ID to check
Returns:
bool: True if cancelled
"""
with self._lock:
if session_id not in self._sessions:
return True
return self._sessions[session_id].get("is_cancelled", False)
def reset_cancellation(self, session_id: str) -> None:
"""
Reset cancellation flag for a session.
Args:
session_id (str): The session ID to reset
"""
with self._lock:
if session_id in self._sessions:
self._sessions[session_id]["is_cancelled"] = False
self._sessions[session_id]["last_accessed"] = time.time()
def add_tool_call_to_history(self, session_id: str, tool_name: str, arguments: Dict[str, Any], cache_key: str) -> None:
"""
Add a tool call to the session's tool call history.
Args:
session_id (str): The session ID
tool_name (str): Name of the tool that was called
arguments (Dict[str, Any]): Arguments passed to the tool
cache_key (str): Cache key used for this tool call
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
tool_call_entry = {
"tool_name": tool_name,
"arguments": arguments.copy(),
"cache_key": cache_key,
"timestamp": time.time(),
"call_number": len(self._sessions[session_id]["tool_call_history"]) + 1
}
self._sessions[session_id]["tool_call_history"].append(tool_call_entry)
self._sessions[session_id]["last_accessed"] = time.time()
def get_tool_call_history(self, session_id: str) -> List[Dict[str, Any]]:
"""
Get the tool call history for a specific session.
Args:
session_id (str): The session ID
Returns:
List[Dict[str, Any]]: List of tool calls made in this session
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id]["last_accessed"] = time.time()
return self._sessions[session_id]["tool_call_history"].copy()
def add_visual_analysis_to_history(self, session_id: str, visual_analysis: str, additional_objects: Optional[List[Dict[str, Any]]] = None) -> None:
"""
Add a visual analysis response to the session's history.
Args:
session_id (str): The session ID
visual_analysis (str): Visual analysis text from visual agent
additional_objects (Optional[List[Dict[str, Any]]]): Additional objects detected by visual agent
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
visual_entry = {
"visual_analysis": visual_analysis,
"additional_objects": additional_objects or [],
"timestamp": time.time(),
"turn_number": len(self._sessions[session_id]["visual_analysis_history"]) + 1
}
self._sessions[session_id]["visual_analysis_history"].append(visual_entry)
self._sessions[session_id]["last_accessed"] = time.time()
def get_visual_analysis_history(self, session_id: str) -> List[Dict[str, Any]]:
"""
Get all visual analysis responses from previous turns.
Args:
session_id (str): The session ID
Returns:
List[Dict[str, Any]]: List of visual analysis entries with text and additional objects
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id]["last_accessed"] = time.time()
return self._sessions[session_id]["visual_analysis_history"].copy()
def get_formatted_tool_call_history(self, session_id: str) -> str:
"""
Get formatted tool call history for memory agent context.
Args:
session_id (str): The session ID
Returns:
str: Formatted tool call history string
Raises:
KeyError: If session_id doesn't exist
"""
try:
tool_calls = self.get_tool_call_history(session_id)
if not tool_calls:
return "No previous tool calls in this session."
formatted_history = []
for tool_call in tool_calls:
call_info = f"Tool Call #{tool_call.get('call_number', 'N/A')}: "
call_info += f"{tool_call.get('tool_name', 'unknown')} "
call_info += f"with args {tool_call.get('arguments', {})}"
formatted_history.append(call_info)
return "\n".join(formatted_history)
except KeyError:
return f"Session {session_id} not found - no tool call history available."
def store_conversation_turn_context(
self,
session_id: str,
turn_number: int,
user_query: str,
visual_context: str,
detection_narrative: str,
tool_cache_id: Optional[str],
ecology_response: str
) -> None:
"""
Store complete turn context for memory agent.
Args:
session_id (str): The session ID
turn_number (int): Sequential number of this conversation turn (1-indexed)
user_query (str): The original user question of the current turn
visual_context (str): Complete visual analysis output from the visual agent
detection_narrative (str): Comprehensive spatial analysis narrative generated
from DeepForest detection results
tool_cache_id (Optional[str]): Cache identifier for DeepForest tool execution
results
ecology_response (str): Final synthesized ecological analysis response
"""
turn_data = {
"user_query": user_query,
"visual_context": visual_context,
"detection_narrative": detection_narrative,
"tool_cache_id": tool_cache_id or "No tool cache ID",
"ecology_response": ecology_response,
"timestamp": time.time()
}
self.set(session_id, f"conversation_turn_{turn_number}", turn_data)
# Update turn counter
current_turns = self.get(session_id, "total_turns", 0)
self.set(session_id, "total_turns", max(current_turns, turn_number))
def get_cache_stats_for_session(self, session_id: str) -> Dict[str, Any]:
"""
Get cache statistics specific to this session.
Args:
session_id (str): The session ID
Returns:
Dict[str, Any]: Cache statistics for this session
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
session_tool_calls = self._sessions[session_id]["tool_call_history"]
return {
"session_id": session_id,
"total_tool_calls": len(session_tool_calls),
"tool_calls": session_tool_calls,
"global_cache_stats": tool_call_cache.get_cache_stats()
}
def clear_session_cache_data(self, session_id: str) -> None:
"""
Clear tool call history for a specific session.
Note: This only clears the session's record of tool calls,
not the global cache itself.
Args:
session_id (str): The session ID
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id]["tool_call_history"] = []
self._sessions[session_id]["last_accessed"] = time.time()
def clear_conversation(self, session_id: str) -> None:
"""
Clear conversation-specific state for a session.
current_image and thread_id are preserved so that users can
start a new conversation without re-uploading the image.
Args:
session_id (str): The session ID to clear
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id].update({
"conversation_history": [],
"annotated_image": None,
"first_message": True,
"last_accessed": time.time(),
"is_cancelled": True,
"is_processing": False,
"tool_call_history": [],
"visual_analysis_history": []
})
def reset_for_new_image(self, session_id: str, image: Any) -> None:
"""
Reset session state for new image upload.
Args:
session_id (str): The session ID
image (Any): The new image object (typically PIL Image)
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id].update({
"current_image": image,
"conversation_history": [],
"annotated_image": None,
"first_message": True,
"last_accessed": time.time(),
"tool_call_history": [],
"visual_analysis_history": []
})
def add_to_conversation(self, session_id: str, message: Dict[str, Any]) -> None:
"""
Add a message to conversation history for a specific session.
Args:
session_id (str): The session ID
message (Dict[str, Any]): Message dictionary with role and content
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id]["conversation_history"].append(message)
self._sessions[session_id]["last_accessed"] = time.time()
def get_conversation_length(self, session_id: str) -> int:
"""
Get the length of conversation history for a session.
Args:
session_id (str): The session ID
Returns:
int: Number of messages in conversation history
Raises:
KeyError: If session_id doesn't exist
"""
with self._lock:
if session_id not in self._sessions:
raise KeyError(f"Session {session_id} not found")
self._sessions[session_id]["last_accessed"] = time.time()
return len(self._sessions[session_id]["conversation_history"])
def session_exists(self, session_id: str) -> bool:
"""
Check if a session exists.
Args:
session_id (str): The session ID to check
Returns:
bool: True if session exists, False otherwise
"""
with self._lock:
return session_id in self._sessions
def get_all_sessions(self) -> Dict[str, Dict[str, Any]]:
"""
Get information about all active sessions.
Returns:
Dict[str, Dict[str, Any]]: Dictionary mapping session_ids to session info
"""
with self._lock:
session_info = {}
for session_id, session_data in self._sessions.items():
session_info[session_id] = {
"thread_id": session_data.get("thread_id"),
"created_at": session_data.get("created_at"),
"last_accessed": session_data.get("last_accessed"),
"conversation_length": len(session_data.get("conversation_history", [])),
"has_image": session_data.get("current_image") is not None,
"has_annotated_image": session_data.get("annotated_image") is not None,
"tool_calls_count": len(session_data.get("tool_call_history", []))
}
return session_info
def cleanup_inactive_sessions(self) -> int:
"""
Remove sessions that haven't been accessed recently.
Returns:
int: Number of sessions cleaned up
"""
current_time = time.time()
cleaned_count = 0
with self._lock:
inactive_sessions = []
for session_id, session_data in self._sessions.items():
last_accessed = session_data.get("last_accessed", 0)
if current_time - last_accessed > self._cleanup_interval:
inactive_sessions.append(session_id)
for session_id in inactive_sessions:
del self._sessions[session_id]
cleaned_count += 1
return cleaned_count
def delete_session(self, session_id: str) -> bool:
"""
Manually delete a specific session.
Args:
session_id (str): The session ID to delete
Returns:
bool: True if session was deleted, False if it didn't exist
"""
with self._lock:
if session_id in self._sessions:
del self._sessions[session_id]
return True
return False
# Global session manager instance
session_state_manager = SessionStateManager() |