74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
"""WS v1 protocol message models and helpers."""
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from typing import Optional, Dict, Any, Literal
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from pydantic import BaseModel, Field
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def now_ms() -> int:
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"""Current unix timestamp in milliseconds."""
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import time
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return int(time.time() * 1000)
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# Client -> Server messages
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class HelloMessage(BaseModel):
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type: Literal["hello"]
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version: str = Field(..., description="Protocol version, currently v1")
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auth: Optional[Dict[str, str]] = Field(default=None, description="Auth payload, e.g. {'apiKey': '...'}")
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class SessionStartMessage(BaseModel):
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type: Literal["session.start"]
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audio: Optional[Dict[str, Any]] = Field(default=None, description="Optional audio format metadata")
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metadata: Optional[Dict[str, Any]] = Field(default=None, description="Optional session metadata")
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class SessionStopMessage(BaseModel):
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type: Literal["session.stop"]
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reason: Optional[str] = None
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class InputTextMessage(BaseModel):
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type: Literal["input.text"]
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text: str
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class ResponseCancelMessage(BaseModel):
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type: Literal["response.cancel"]
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graceful: bool = False
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class ToolCallResultsMessage(BaseModel):
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type: Literal["tool_call.results"]
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results: list[Dict[str, Any]] = Field(default_factory=list)
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CLIENT_MESSAGE_TYPES = {
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"hello": HelloMessage,
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"session.start": SessionStartMessage,
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"session.stop": SessionStopMessage,
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"input.text": InputTextMessage,
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"response.cancel": ResponseCancelMessage,
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"tool_call.results": ToolCallResultsMessage,
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}
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def parse_client_message(data: Dict[str, Any]) -> BaseModel:
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"""Parse and validate a WS v1 client message."""
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msg_type = data.get("type")
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if not msg_type:
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raise ValueError("Missing 'type' field")
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msg_class = CLIENT_MESSAGE_TYPES.get(msg_type)
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if not msg_class:
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raise ValueError(f"Unknown client message type: {msg_type}")
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return msg_class(**data)
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# Server -> Client event helpers
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def ev(event_type: str, **payload: Any) -> Dict[str, Any]:
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"""Create a WS v1 server event payload."""
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base = {"type": event_type, "timestamp": now_ms()}
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base.update(payload)
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return base
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