Emil Shanaty
0cfb4277b5
- protocol.py: pydantic models for all AICC message types (envelope, session_init, tool_call, tool_result, event, error, heartbeat) - bridge.py: Bridge with @bridge.tool registration, capability checks, session management, serve_forever - client.py: AICCClient with single background reader (safe on concurrent transports like WebSocket), call_tool, events, manifest - tool.py: @tool decorator with schema generation from type hints - schema.py: JSON Schema generation (str/int/float/bool, list, dict, Optional, pydantic models) - transport: Transport protocol, InProcessTransport, WebSocket client+server - tests: 12 passing (integration, schema, websocket roundtrip) - examples: bridge_minimal.py + agent_minimal.py (verified end-to-end)
268 lines
9.1 KiB
Python
268 lines
9.1 KiB
Python
"""Bridge: environment side of the AICC protocol."""
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from __future__ import annotations
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import asyncio
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import inspect
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import uuid
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from dataclasses import dataclass, field
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from typing import Any, Callable
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from aicc.protocol import (
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Capabilities,
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ErrorCode,
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ErrorPayload,
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Heartbeat,
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MessageType,
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ModelClass,
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ModelDecl,
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SessionClose,
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SessionInit,
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TickMode,
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ToolCall,
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ToolResult,
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ToolSpec,
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WorldKind,
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WorldSpec,
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PROTOCOL_VERSION,
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)
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from aicc.tool import ToolDefinition, call_tool_impl
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@dataclass
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class Session:
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"""A live bridge session with one connected agent."""
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session_id: str = field(default_factory=lambda: str(uuid.uuid4()))
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manifest: SessionInit | None = None
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send_queue: asyncio.Queue[dict[str, Any]] = field(default_factory=asyncio.Queue)
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closed: bool = False
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class Bridge:
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"""Environment-side bridge.
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Holds the world state, registered tools, and per-session state.
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Bridges run inside transports (in-process, websocket, etc.) and do not
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perform I/O directly.
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Example:
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bridge = Bridge(name="capsule", kind=WorldKind.THREE_D)
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@bridge.tool(description="Get current position.")
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async def proprioception() -> dict:
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return {"position": {"x": 0, "y": 0, "z": 0}, ...}
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bridge.register_tool(...)
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"""
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def __init__(
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self,
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name: str,
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kind: WorldKind = WorldKind.THREE_D,
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tick_rate_hz: float = 10.0,
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tick_mode: TickMode = TickMode.FIXED,
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agent_model: ModelClass = ModelClass.EDGE_MEDIUM,
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expected_first_token_ms: int | None = None,
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expected_full_response_ms: int | None = None,
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):
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self.name = name
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self.kind = kind
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self.tick_rate_hz = tick_rate_hz
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self.tick_mode = tick_mode
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self.agent_model = agent_model
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self.expected_first_token_ms = expected_first_token_ms
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self.expected_full_response_ms = expected_full_response_ms
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self._tools: dict[str, ToolDefinition] = {}
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self._sessions: dict[str, Session] = {}
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# ---------- Tool registration ----------
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def tool(
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self,
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_fn: Callable[..., Any] | None = None,
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*,
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id: str | None = None,
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cls=None,
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description: str | None = None,
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requires_capability: str | None = None,
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limits: dict[str, Any] | None = None,
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strict_input: bool = False,
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):
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"""Register a tool. Use as @bridge.tool or @bridge.tool(cls=..., ...)."""
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from aicc.tool import tool as _tool
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if _fn is not None and callable(_fn):
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defn = _tool(_fn)
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self.register_tool(defn)
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return _fn
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def wrap(fn: Callable[..., Any]) -> Callable[..., Any]:
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defn = _tool(
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fn,
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id=id,
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cls=cls,
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description=description,
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requires_capability=requires_capability,
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limits=limits,
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strict_input=strict_input,
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)
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self.register_tool(defn)
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return fn
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return wrap
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def register_tool(self, definition: ToolDefinition) -> None:
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if definition.id in self._tools:
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raise ValueError(f"Tool id '{definition.id}' is already registered.")
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self._tools[definition.id] = definition
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def tools(self) -> list[ToolDefinition]:
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return list(self._tools.values())
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# ---------- Capability computation ----------
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def capabilities(self) -> Capabilities:
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return Capabilities(
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sensors=[t.id for t in self._tools.values() if t.cls.value == "sensor"],
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actuators=[t.id for t in self._tools.values() if t.cls.value == "actuator"],
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generators=[t.id for t in self._tools.values() if t.cls.value == "generator"],
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)
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# ---------- Session handling ----------
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def open_session(self) -> Session:
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session = Session()
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manifest = self._build_manifest(session.session_id)
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session.manifest = manifest
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self._sessions[session.session_id] = session
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return session
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def close_session(self, session_id: str) -> None:
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sess = self._sessions.pop(session_id, None)
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if sess is not None:
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sess.closed = True
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def session(self, session_id: str) -> Session:
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sess = self._sessions.get(session_id)
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if sess is None or sess.closed:
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raise KeyError(session_id)
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return sess
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async def serve_forever(self) -> None:
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"""Run the bridge event loop until cancelled.
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Useful with a server transport (e.g. WebSocketServer) already running:
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async with WebSocketServer(bridge, port=8765):
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await bridge.serve_forever()
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"""
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while True:
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await asyncio.sleep(3600)
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def _build_manifest(self, session_id: str) -> SessionInit:
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return SessionInit(
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session_id=session_id,
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tick_rate_hz=self.tick_rate_hz,
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tick_mode=self.tick_mode,
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world=WorldSpec(name=self.name, kind=self.kind),
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agent_model=ModelDecl(
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class_=self.agent_model,
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expected_first_token_ms=self.expected_first_token_ms,
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expected_full_response_ms=self.expected_full_response_ms,
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),
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capabilities=self.capabilities(),
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tools=[
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ToolSpec(
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id=t.id,
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class_=t.cls,
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description=t.description,
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input_schema=t.input_schema,
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output_schema=t.output_schema,
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requires_capability=t.requires_capability,
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limits=t.limits,
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strict_input=t.strict_input,
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)
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for t in self._tools.values()
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],
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)
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# ---------- Message handling ----------
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async def handle_message(self, session_id: str, raw: dict[str, Any]) -> dict[str, Any] | None:
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"""Handle a single incoming message from an agent.
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Returns the response message (or None for fire-and-forget events/heartbeats).
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May also push async events to the session queue.
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"""
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msg_type = raw.get("type")
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if msg_type == MessageType.MANIFEST_REQUEST.value:
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sess = self.session(session_id)
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return sess.manifest.model_dump(by_alias=True) if sess.manifest else None
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if msg_type == MessageType.TOOL_CALL.value:
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return await self._handle_tool_call(session_id, ToolCall.model_validate(raw))
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if msg_type == MessageType.SESSION_CLOSE.value:
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self.close_session(session_id)
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return SessionClose(
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session_id=session_id,
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reason=(raw.get("reason") or "client_close"),
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).model_dump(by_alias=True)
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if msg_type == MessageType.HEARTBEAT.value:
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return Heartbeat(session_id=session_id).model_dump(by_alias=True)
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if msg_type == MessageType.SESSION_RESUME.value:
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sess = self.session(raw.get("session_id") or session_id)
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return sess.manifest.model_dump(by_alias=True) if sess.manifest else None
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return None
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async def _handle_tool_call(self, session_id: str, call: ToolCall) -> dict[str, Any]:
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defn = self._tools.get(call.tool)
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if defn is None:
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return ToolResult(
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session_id=session_id,
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call_id=call.call_id,
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ok=False,
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error=ErrorPayload(
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code=ErrorCode.TOOL_UNKNOWN,
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message=f"Tool '{call.tool}' is not registered.",
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retryable=False,
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),
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).model_dump(by_alias=True)
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if defn.requires_capability and defn.requires_capability not in self._sessions[session_id].manifest.capabilities.sensors + self._sessions[session_id].manifest.capabilities.actuators + self._sessions[session_id].manifest.capabilities.generators: # type: ignore[union-attr]
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return ToolResult(
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session_id=session_id,
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call_id=call.call_id,
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ok=False,
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error=ErrorPayload(
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code=ErrorCode.TOOL_UNAVAILABLE,
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message=f"Tool '{call.tool}' requires capability '{defn.requires_capability}'.",
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retryable=False,
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),
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).model_dump(by_alias=True)
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try:
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output = await call_tool_impl(defn, call.input)
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except asyncio.CancelledError:
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raise
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except Exception as exc: # noqa: BLE001
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return ToolResult(
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session_id=session_id,
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call_id=call.call_id,
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ok=False,
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error=ErrorPayload(
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code=ErrorCode.EXECUTION_FAILED,
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message=f"{type(exc).__name__}: {exc}",
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retryable=False,
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),
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).model_dump(by_alias=True)
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if not isinstance(output, dict):
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output = {"value": output}
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return ToolResult(
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session_id=session_id,
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call_id=call.call_id,
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ok=True,
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output=output,
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).model_dump(by_alias=True)
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