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"""
Feature flags module for ComfyUI WebSocket protocol negotiation.
This module handles capability negotiation between frontend and backend,
allowing graceful protocol evolution while maintaining backward compatibility.
"""
from typing import Any, Dict
from comfy.cli_args import args
# Default server capabilities
SERVER_FEATURE_FLAGS: Dict[str, Any] = {
"supports_preview_metadata": True,
"max_upload_size": args.max_upload_size * 1024 * 1024, # Convert MB to bytes
}
def get_connection_feature(
sockets_metadata: Dict[str, Dict[str, Any]],
sid: str,
feature_name: str,
default: Any = False
) -> Any:
"""
Get a feature flag value for a specific connection.
Args:
sockets_metadata: Dictionary of socket metadata
sid: Session ID of the connection
feature_name: Name of the feature to check
default: Default value if feature not found
Returns:
Feature value or default if not found
"""
if sid not in sockets_metadata:
return default
return sockets_metadata[sid].get("feature_flags", {}).get(feature_name, default)
def supports_feature(
sockets_metadata: Dict[str, Dict[str, Any]],
sid: str,
feature_name: str
) -> bool:
"""
Check if a connection supports a specific feature.
Args:
sockets_metadata: Dictionary of socket metadata
sid: Session ID of the connection
feature_name: Name of the feature to check
Returns:
Boolean indicating if feature is supported
"""
return get_connection_feature(sockets_metadata, sid, feature_name, False) is True
def get_server_features() -> Dict[str, Any]:
"""
Get the server's feature flags.
Returns:
Dictionary of server feature flags
"""
return SERVER_FEATURE_FLAGS.copy()
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