275 lines
9.0 KiB
Python
275 lines
9.0 KiB
Python
"""OpenAI chat completion response builder."""
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import logging
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import time
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import uuid
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from typing import Any, Dict, List, Optional, Tuple, Union
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from pydantic import BaseModel
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from astrai.inference.api.protocol import (
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GenContext,
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ResponseBuilder,
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StopInfo,
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sse_event,
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)
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from astrai.inference.api.tool_parser import BaseToolParser, ToolParserFactory
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from astrai.inference.engine import InferenceEngine
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logger = logging.getLogger(__name__)
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_UNSUPPORTED_PARAMS = (
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"n",
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"presence_penalty",
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"frequency_penalty",
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"logit_bias",
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"user",
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)
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def _resolve_tool_choice(
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request: BaseModel,
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) -> Union[str, Dict[str, Any]]:
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tc = getattr(request, "tool_choice", None)
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if tc is None:
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return "auto"
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if isinstance(tc, str):
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return tc
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if isinstance(tc, dict):
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return tc
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return "auto"
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def _resolve_tools(request: BaseModel) -> Optional[List[Dict[str, Any]]]:
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raw = getattr(request, "tools", None)
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if not raw:
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return None
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if isinstance(raw, list):
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return [t.model_dump() if hasattr(t, "model_dump") else t for t in raw]
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return None
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class OpenAIResponseBuilder(ResponseBuilder):
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def prepare(
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self, request: BaseModel, engine: InferenceEngine
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) -> Tuple[str, GenContext, List[str]]:
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messages = [{"role": m.role, "content": m.content} for m in request.messages]
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tools = _resolve_tools(request)
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prompt = engine.tokenizer.apply_chat_template(
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messages, tokenize=False, tools=tools or []
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)
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self._resp_id = f"chatcmpl-{uuid.uuid4().hex[:12]}"
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self._model = request.model
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for param in _UNSUPPORTED_PARAMS:
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value = getattr(request, param, None)
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fields = getattr(type(request), "model_fields", {})
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default = fields[param].default if param in fields else None
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if value is not None and value != default:
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logger.warning(
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"ChatCompletionRequest param '%s'=%r is not supported"
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" and will be ignored",
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param,
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value,
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)
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self._parser: Optional[BaseToolParser] = None
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if tools:
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tool_choice = _resolve_tool_choice(request)
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self._parser = ToolParserFactory.create(
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"simple_json", tools=tools, tool_choice=tool_choice
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)
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self._content_started = False
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ctx = GenContext(
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resp_id=self._resp_id,
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created=int(time.time()),
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model=self._model,
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prompt_tokens=0,
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)
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stop = request.stop
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stop_sequences = (
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[] if stop is None else [stop] if isinstance(stop, str) else stop
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)
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return prompt, ctx, stop_sequences
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def format_stream_start(self, ctx: GenContext) -> List[str]:
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return [
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sse_event(
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{
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"id": self._resp_id,
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"object": "chat.completion.chunk",
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"created": ctx.created,
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"model": self._model,
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"choices": [
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{
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"index": 0,
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"delta": {"role": "assistant"},
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"finish_reason": None,
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}
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],
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}
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)
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]
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def format_chunk(self, token: str, body: str) -> List[str]:
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if self._parser is not None:
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return self._format_tool_chunk(body)
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return [
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sse_event(
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{
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"id": self._resp_id,
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"object": "chat.completion.chunk",
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"created": 0,
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"model": self._model,
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"choices": [
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{
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"index": 0,
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"delta": {"content": token},
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"finish_reason": None,
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}
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],
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}
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)
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]
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def _format_tool_chunk(self, body: str) -> List[str]:
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deltas = self._parser.feed(body)
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events: List[str] = []
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for d in deltas:
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if "content" in d:
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if not self._content_started:
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events.append(self._role_chunk())
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self._content_started = True
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events.append(
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sse_event(
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{
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"id": self._resp_id,
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"object": "chat.completion.chunk",
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"created": 0,
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"model": self._model,
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"choices": [
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{
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"index": 0,
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"delta": {"content": d["content"]},
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"finish_reason": None,
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}
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],
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}
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)
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)
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elif "tool_calls" in d:
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if not self._content_started:
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events.append(self._role_chunk())
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self._content_started = True
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events.append(
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sse_event(
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{
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"id": self._resp_id,
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"object": "chat.completion.chunk",
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"created": 0,
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"model": self._model,
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"choices": [
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{
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"index": 0,
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"delta": {"tool_calls": d["tool_calls"]},
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"finish_reason": None,
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}
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],
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}
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)
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)
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return events
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def _role_chunk(self) -> str:
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return sse_event(
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{
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"id": self._resp_id,
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"object": "chat.completion.chunk",
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"created": 0,
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"model": self._model,
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"choices": [
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{
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"index": 0,
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"delta": {"role": "assistant"},
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"finish_reason": None,
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}
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],
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}
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)
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def format_stream_end(self, ctx: GenContext, stop: StopInfo) -> List[str]:
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finish_reason = "stop"
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if self._parser is not None and self._parser.has_tool_calls:
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finish_reason = "tool_calls"
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return [
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sse_event(
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{
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"id": self._resp_id,
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"object": "chat.completion.chunk",
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"created": ctx.created,
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"model": self._model,
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"choices": [
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{"index": 0, "delta": {}, "finish_reason": finish_reason}
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],
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}
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),
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sse_event(
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{
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"prompt_tokens": ctx.prompt_tokens,
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"completion_tokens": ctx.completion_tokens,
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"total_tokens": ctx.prompt_tokens + ctx.completion_tokens,
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}
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),
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]
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def format_response(
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self, ctx: GenContext, content: str, stop: StopInfo
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) -> Dict[str, Any]:
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if self._parser is not None:
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parsed = self._parser.parse_complete(content)
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if parsed and parsed.get("tool_calls"):
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return {
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"id": self._resp_id,
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"object": "chat.completion",
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"created": ctx.created,
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"model": self._model,
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"choices": [
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{
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"index": 0,
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"message": {
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"role": "assistant",
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"content": parsed.get("content"),
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"tool_calls": parsed["tool_calls"],
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},
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"finish_reason": "tool_calls",
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}
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],
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"usage": {
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"prompt_tokens": ctx.prompt_tokens,
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"completion_tokens": ctx.completion_tokens,
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"total_tokens": ctx.prompt_tokens + ctx.completion_tokens,
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},
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}
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return {
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"id": self._resp_id,
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"object": "chat.completion",
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"created": ctx.created,
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"model": self._model,
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"choices": [
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{
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"index": 0,
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"message": {"role": "assistant", "content": content},
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"finish_reason": "stop",
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}
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],
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"usage": {
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"prompt_tokens": ctx.prompt_tokens,
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"completion_tokens": ctx.completion_tokens,
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"total_tokens": ctx.prompt_tokens + ctx.completion_tokens,
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},
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}
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