mirror of
https://github.com/andrewyng/openworker.git
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137 lines
4.7 KiB
Python
137 lines
4.7 KiB
Python
"""Provider-agnostic model access layer.
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The runtime never imports a provider SDK directly — it talks to a `ProviderClient`.
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Implementations: `OpenAIResponsesProvider` (native OpenAI via `/v1/responses`),
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`OpenAIProvider` (Chat Completions — the compat world), and the native
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Anthropic/Gemini/Bedrock/Vertex providers, all selected by the registry/router.
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"""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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from dataclasses import dataclass, field
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from typing import Any, Optional
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@dataclass
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class ToolCall:
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"""A single tool call requested by the model, with parsed arguments."""
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id: str
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name: str
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arguments: dict[str, Any] = field(default_factory=dict)
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@dataclass
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class TokenUsage:
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"""Normalized token counts for one model round-trip.
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`input` counts only fresh (uncached) prompt tokens; cached prompt tokens are
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split into `cache_read`/`cache_write`. Providers that don't report a cache
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split (Ollama, most compat vendors) leave the cache fields at 0. `output`
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includes thinking tokens where the vendor bills them as output (Gemini).
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"""
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input: int = 0
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output: int = 0
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cache_read: int = 0
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cache_write: int = 0
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@property
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def context_tokens(self) -> int:
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"""Prompt-side total — what actually occupied the context window."""
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return self.input + self.cache_read + self.cache_write
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def as_dict(self) -> dict[str, int]:
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return {
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"input": self.input,
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"output": self.output,
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"cache_read": self.cache_read,
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"cache_write": self.cache_write,
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}
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@dataclass
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class AssistantTurn:
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"""One assistant response: free text and/or a set of tool calls."""
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text: Optional[str] = None
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tool_calls: list[ToolCall] = field(default_factory=list)
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finish_reason: Optional[str] = None
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raw: Any = field(default=None, repr=False, compare=False)
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# The model's thinking text (DeepSeek reasoning_content, Gemini thought summaries, …).
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# Display-only: persisted on the assistant message as the `reasoning` sidecar and shown
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# in the GUI, but stripped before every provider call — never replayed as context.
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reasoning: Optional[str] = None
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# Provider-private sidecars to persist on the canonical assistant message
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# (underscore-prefixed keys, e.g. `_gemini` thought signatures). Contract: the
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# owning provider consumes its own key when converting history; every other
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# provider must strip or ignore foreign underscore keys before its wire call.
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extras: dict[str, Any] = field(default_factory=dict)
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# Token counts for this round-trip, normalized across providers. None when the
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# backend didn't report usage (some compat servers) — never guessed.
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usage: Optional[TokenUsage] = None
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@property
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def has_tool_calls(self) -> bool:
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return bool(self.tool_calls)
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@dataclass(frozen=True)
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class ModelCapabilities:
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"""What a given model/provider can do; used for graceful degradation."""
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tools: bool = True
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vision: bool = False
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# Native PDF ingestion (OpenAI `file` part / Anthropic document / Gemini inline_data).
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# Models without it get a local fallback: text extraction or page images (pdf_support.py).
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pdf: bool = False
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parallel_tool_calls: bool = True
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streaming: bool = True
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@dataclass
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class StreamChunk:
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"""One streamed piece: a text and/or reasoning delta, and/or (final) the full turn."""
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text_delta: Optional[str] = None
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reasoning_delta: Optional[str] = None
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turn: Optional[AssistantTurn] = None
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class ProviderClient(ABC):
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"""Single-shot, provider-agnostic completion interface.
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Deliberately blocking (the turn engine wraps it in `asyncio.to_thread`) and
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deliberately without a `max_turns` loop — the runtime owns the agent loop.
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"""
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@abstractmethod
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def complete(
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self,
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*,
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model: str,
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messages: list[dict[str, Any]],
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tools: Optional[list[dict[str, Any]]] = None,
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**settings: Any,
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) -> AssistantTurn:
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"""Return one assistant turn for the given messages/tools."""
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@abstractmethod
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def capabilities(self, model: str) -> ModelCapabilities:
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"""Return capability flags for the given model."""
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def stream(
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self,
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*,
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model: str,
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messages: list[dict[str, Any]],
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tools: Optional[list[dict[str, Any]]] = None,
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**settings: Any,
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):
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"""Yield StreamChunks. Default: no token streaming — one final chunk with the
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full turn. Providers that support streaming (OpenAIProvider) override this."""
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yield StreamChunk(
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turn=self.complete(model=model, messages=messages, tools=tools, **settings)
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)
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