chengyongruandXubin Ren
22a0df0c53
- Remove TOCTOU exists() check in _load(); rely on FileNotFoundError - Define PAIRING_CODE_META_KEY and PAIRING_COMMAND_META_KEY constants in nanobot.pairing, replacing magic strings across base.py, slack.py, and builtin.py - Flatten nested revoke logic in handle_pairing_command() - Trim redundant docstring/comment noise in is_allowed() and generate_code()
261 lines
9.2 KiB
Python
261 lines
9.2 KiB
Python
"""Base channel interface for chat platforms."""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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from pathlib import Path
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from typing import Any
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from loguru import logger
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from nanobot.bus.events import InboundMessage, OutboundMessage
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from nanobot.bus.queue import MessageBus
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from nanobot.pairing import (
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PAIRING_CODE_META_KEY,
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format_pairing_reply,
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generate_code,
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is_approved,
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)
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class BaseChannel(ABC):
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"""
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Abstract base class for chat channel implementations.
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Each channel (Telegram, Discord, etc.) should implement this interface
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to integrate with the nanobot message bus.
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"""
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name: str = "base"
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display_name: str = "Base"
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transcription_provider: str = "groq"
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transcription_api_key: str = ""
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transcription_api_base: str = ""
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transcription_language: str | None = None
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send_progress: bool = True
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send_tool_hints: bool = False
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show_reasoning: bool = True
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def __init__(self, config: Any, bus: MessageBus):
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"""
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Initialize the channel.
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Args:
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config: Channel-specific configuration.
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bus: The message bus for communication.
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"""
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self.config = config
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self.logger = logger.bind(channel=self.name)
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self.bus = bus
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self._running = False
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async def transcribe_audio(self, file_path: str | Path) -> str:
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"""Transcribe an audio file via Whisper (OpenAI or Groq). Returns empty string on failure."""
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if not self.transcription_api_key:
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return ""
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try:
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if self.transcription_provider == "openai":
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from nanobot.providers.transcription import OpenAITranscriptionProvider
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provider = OpenAITranscriptionProvider(
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api_key=self.transcription_api_key,
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api_base=self.transcription_api_base or None,
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language=self.transcription_language or None,
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)
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else:
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from nanobot.providers.transcription import GroqTranscriptionProvider
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provider = GroqTranscriptionProvider(
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api_key=self.transcription_api_key,
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api_base=self.transcription_api_base or None,
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language=self.transcription_language or None,
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)
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return await provider.transcribe(file_path)
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except Exception:
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self.logger.exception("Audio transcription failed")
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return ""
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async def login(self, force: bool = False) -> bool:
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"""
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Perform channel-specific interactive login (e.g. QR code scan).
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Args:
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force: If True, ignore existing credentials and force re-authentication.
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Returns True if already authenticated or login succeeds.
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Override in subclasses that support interactive login.
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"""
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return True
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@abstractmethod
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async def start(self) -> None:
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"""
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Start the channel and begin listening for messages.
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This should be a long-running async task that:
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1. Connects to the chat platform
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2. Listens for incoming messages
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3. Forwards messages to the bus via _handle_message()
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"""
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pass
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@abstractmethod
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async def stop(self) -> None:
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"""Stop the channel and clean up resources."""
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pass
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@abstractmethod
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async def send(self, msg: OutboundMessage) -> None:
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"""
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Send a message through this channel.
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Args:
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msg: The message to send.
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Implementations should raise on delivery failure so the channel manager
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can apply any retry policy in one place.
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"""
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pass
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async def send_delta(self, chat_id: str, delta: str, metadata: dict[str, Any] | None = None) -> None:
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"""Deliver a streaming text chunk.
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Override in subclasses to enable streaming. Implementations should
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raise on delivery failure so the channel manager can retry.
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Streaming contract: ``_stream_delta`` is a chunk, ``_stream_end`` ends
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the current segment, and stateful implementations must key buffers by
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``_stream_id`` rather than only by ``chat_id``.
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"""
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pass
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async def send_reasoning_delta(
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self, chat_id: str, delta: str, metadata: dict[str, Any] | None = None
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) -> None:
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"""Stream a chunk of model reasoning/thinking content.
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Default is no-op. Channels with a native low-emphasis primitive
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(Slack context block, Telegram expandable blockquote, Discord
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subtext, WebUI italic bubble, ...) override to render reasoning
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as a subordinate trace that updates in place as the model thinks.
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Streaming contract mirrors :meth:`send_delta`: ``_reasoning_delta``
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is a chunk, ``_reasoning_end`` ends the current reasoning segment,
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and stateful implementations should key buffers by ``_stream_id``
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rather than only by ``chat_id``.
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"""
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return
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async def send_reasoning_end(
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self, chat_id: str, metadata: dict[str, Any] | None = None
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) -> None:
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"""Mark the end of a reasoning stream segment.
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Default is no-op. Channels that buffer ``send_reasoning_delta``
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chunks for in-place updates use this signal to flush and freeze
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the rendered group; one-shot channels can ignore it entirely.
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"""
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return
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async def send_reasoning(self, msg: OutboundMessage) -> None:
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"""Deliver a complete reasoning block.
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Default implementation reuses the streaming pair so plugins only
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need to override the delta/end methods. Equivalent to one delta
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with the full content followed immediately by an end marker —
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keeps a single rendering path for both streamed and one-shot
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reasoning (e.g. DeepSeek-R1's final-response ``reasoning_content``).
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"""
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if not msg.content:
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return
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meta = dict(msg.metadata or {})
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meta.setdefault("_reasoning_delta", True)
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await self.send_reasoning_delta(msg.chat_id, msg.content, meta)
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end_meta = dict(meta)
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end_meta.pop("_reasoning_delta", None)
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end_meta["_reasoning_end"] = True
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await self.send_reasoning_end(msg.chat_id, end_meta)
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@property
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def supports_streaming(self) -> bool:
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"""True when config enables streaming AND this subclass implements send_delta."""
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cfg = self.config
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streaming = cfg.get("streaming", False) if isinstance(cfg, dict) else getattr(cfg, "streaming", False)
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return bool(streaming) and type(self).send_delta is not BaseChannel.send_delta
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def is_allowed(self, sender_id: str) -> bool:
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"""Check sender permission: star > allowlist > pairing store > deny."""
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if isinstance(self.config, dict):
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if "allow_from" in self.config:
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allow_list = self.config.get("allow_from") or []
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else:
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allow_list = self.config.get("allowFrom", []) or []
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else:
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allow_list = getattr(self.config, "allow_from", []) or []
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if "*" in allow_list:
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return True
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# allowFrom entries are opaque tokens — must match exactly.
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if str(sender_id) in allow_list:
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return True
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if is_approved(self.name, str(sender_id)):
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return True
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return False
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async def _handle_message(
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self,
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sender_id: str,
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chat_id: str,
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content: str,
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media: list[str] | None = None,
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metadata: dict[str, Any] | None = None,
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session_key: str | None = None,
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is_dm: bool = False,
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) -> None:
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"""Handle an incoming message: check permissions, issue pairing codes in DMs, or forward to bus."""
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if not self.is_allowed(sender_id):
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if is_dm:
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code = generate_code(self.name, str(sender_id))
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await self.send(
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OutboundMessage(
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channel=self.name,
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chat_id=str(chat_id),
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content=format_pairing_reply(code),
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metadata={PAIRING_CODE_META_KEY: code},
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)
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)
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self.logger.info(
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"Sent pairing code {} to sender {} in chat {}",
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code, sender_id, chat_id,
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)
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else:
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self.logger.warning(
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"Access denied for sender {}. "
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"Add them to allowFrom list in config to grant access.",
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sender_id,
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)
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return
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meta = metadata or {}
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if self.supports_streaming:
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meta = {**meta, "_wants_stream": True}
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msg = InboundMessage(
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channel=self.name,
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sender_id=str(sender_id),
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chat_id=str(chat_id),
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content=content,
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media=media or [],
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metadata=meta,
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session_key_override=session_key,
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)
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await self.bus.publish_inbound(msg)
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@classmethod
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def default_config(cls) -> dict[str, Any]:
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"""Return default config for onboard. Override in plugins to auto-populate config.json."""
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return {"enabled": False}
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@property
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def is_running(self) -> bool:
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"""Check if the channel is running."""
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return self._running
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