refactor: auto-discover channels via pkgutil, eliminate hardcoded registry

nanobot/channels/base.py

@@ -1,6 +1,9 @@
 """Base channel interface for chat platforms."""
 
+from __future__ import annotations
+
 from abc import ABC, abstractmethod
+from pathlib import Path
 from typing import Any
 
 from loguru import logger
@@ -18,6 +21,8 @@ class BaseChannel(ABC):
     """
 
     name: str = "base"
+    display_name: str = "Base"
+    transcription_api_key: str = ""
 
     def __init__(self, config: Any, bus: MessageBus):
         """
@@ -31,6 +36,19 @@ class BaseChannel(ABC):
         self.bus = bus
         self._running = False
 
+    async def transcribe_audio(self, file_path: str | Path) -> str:
+        """Transcribe an audio file via Groq Whisper. Returns empty string on failure."""
+        if not self.transcription_api_key:
+            return ""
+        try:
+            from nanobot.providers.transcription import GroqTranscriptionProvider
+
+            provider = GroqTranscriptionProvider(api_key=self.transcription_api_key)
+            return await provider.transcribe(file_path)
+        except Exception as e:
+            logger.warning("{}: audio transcription failed: {}", self.name, e)
+            return ""
+
     @abstractmethod
     async def start(self) -> None:
         """

nanobot/channels/dingtalk.py

@@ -114,6 +114,7 @@ class DingTalkChannel(BaseChannel):
     """
 
     name = "dingtalk"
+    display_name = "DingTalk"
     _IMAGE_EXTS = {".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp"}
     _AUDIO_EXTS = {".amr", ".mp3", ".wav", ".ogg", ".m4a", ".aac"}
     _VIDEO_EXTS = {".mp4", ".mov", ".avi", ".mkv", ".webm"}

nanobot/channels/discord.py

@@ -25,6 +25,7 @@ class DiscordChannel(BaseChannel):
     """Discord channel using Gateway websocket."""
 
     name = "discord"
+    display_name = "Discord"
 
     def __init__(self, config: DiscordConfig, bus: MessageBus):
         super().__init__(config, bus)

nanobot/channels/email.py

@@ -35,6 +35,7 @@ class EmailChannel(BaseChannel):
     """
 
     name = "email"
+    display_name = "Email"
     _IMAP_MONTHS = (
         "Jan",
         "Feb",

nanobot/channels/feishu.py

@@ -244,11 +244,11 @@ class FeishuChannel(BaseChannel):
     """
 
     name = "feishu"
+    display_name = "Feishu"
 
-    def __init__(self, config: FeishuConfig, bus: MessageBus, groq_api_key: str = ""):
+    def __init__(self, config: FeishuConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: FeishuConfig = config
-        self.groq_api_key = groq_api_key
         self._client: Any = None
         self._ws_client: Any = None
         self._ws_thread: threading.Thread | None = None
@@ -928,16 +928,10 @@ class FeishuChannel(BaseChannel):
                 if file_path:
                     media_paths.append(file_path)
 
-                # Transcribe audio using Groq Whisper
+                if msg_type == "audio" and file_path:
-                if msg_type == "audio" and file_path and self.groq_api_key:
+                    transcription = await self.transcribe_audio(file_path)
-                    try:
+                    if transcription:
-                        from nanobot.providers.transcription import GroqTranscriptionProvider
+                        content_text = f"[transcription: {transcription}]"
-                        transcriber = GroqTranscriptionProvider(api_key=self.groq_api_key)
-                        transcription = await transcriber.transcribe(file_path)
-                        if transcription:
-                            content_text = f"[transcription: {transcription}]"
-                    except Exception as e:
-                        logger.warning("Failed to transcribe audio: {}", e)
 
                 content_parts.append(content_text)
 

nanobot/channels/manager.py

@@ -31,135 +31,23 @@ class ChannelManager:
         self._init_channels()
 
     def _init_channels(self) -> None:
-        """Initialize channels based on config."""
+        """Initialize channels discovered via pkgutil scan."""
+        from nanobot.channels.registry import discover_channel_names, load_channel_class
 
-        # Telegram channel
+        groq_key = self.config.providers.groq.api_key
-        if self.config.channels.telegram.enabled:
+
+        for modname in discover_channel_names():
+            section = getattr(self.config.channels, modname, None)
+            if not section or not getattr(section, "enabled", False):
+                continue
             try:
-                from nanobot.channels.telegram import TelegramChannel
+                cls = load_channel_class(modname)
-                self.channels["telegram"] = TelegramChannel(
+                channel = cls(section, self.bus)
-                    self.config.channels.telegram,
+                channel.transcription_api_key = groq_key
-                    self.bus,
+                self.channels[modname] = channel
-                    groq_api_key=self.config.providers.groq.api_key,
+                logger.info("{} channel enabled", cls.display_name)
-                )
-                logger.info("Telegram channel enabled")
             except ImportError as e:
-                logger.warning("Telegram channel not available: {}", e)
+                logger.warning("{} channel not available: {}", modname, e)
-
-        # WhatsApp channel
-        if self.config.channels.whatsapp.enabled:
-            try:
-                from nanobot.channels.whatsapp import WhatsAppChannel
-                self.channels["whatsapp"] = WhatsAppChannel(
-                    self.config.channels.whatsapp, self.bus
-                )
-                logger.info("WhatsApp channel enabled")
-            except ImportError as e:
-                logger.warning("WhatsApp channel not available: {}", e)
-
-        # Discord channel
-        if self.config.channels.discord.enabled:
-            try:
-                from nanobot.channels.discord import DiscordChannel
-                self.channels["discord"] = DiscordChannel(
-                    self.config.channels.discord, self.bus
-                )
-                logger.info("Discord channel enabled")
-            except ImportError as e:
-                logger.warning("Discord channel not available: {}", e)
-
-        # Feishu channel
-        if self.config.channels.feishu.enabled:
-            try:
-                from nanobot.channels.feishu import FeishuChannel
-                self.channels["feishu"] = FeishuChannel(
-                    self.config.channels.feishu, self.bus,
-                    groq_api_key=self.config.providers.groq.api_key,
-                )
-                logger.info("Feishu channel enabled")
-            except ImportError as e:
-                logger.warning("Feishu channel not available: {}", e)
-
-        # Mochat channel
-        if self.config.channels.mochat.enabled:
-            try:
-                from nanobot.channels.mochat import MochatChannel
-
-                self.channels["mochat"] = MochatChannel(
-                    self.config.channels.mochat, self.bus
-                )
-                logger.info("Mochat channel enabled")
-            except ImportError as e:
-                logger.warning("Mochat channel not available: {}", e)
-
-        # DingTalk channel
-        if self.config.channels.dingtalk.enabled:
-            try:
-                from nanobot.channels.dingtalk import DingTalkChannel
-                self.channels["dingtalk"] = DingTalkChannel(
-                    self.config.channels.dingtalk, self.bus
-                )
-                logger.info("DingTalk channel enabled")
-            except ImportError as e:
-                logger.warning("DingTalk channel not available: {}", e)
-
-        # Email channel
-        if self.config.channels.email.enabled:
-            try:
-                from nanobot.channels.email import EmailChannel
-                self.channels["email"] = EmailChannel(
-                    self.config.channels.email, self.bus
-                )
-                logger.info("Email channel enabled")
-            except ImportError as e:
-                logger.warning("Email channel not available: {}", e)
-
-        # Slack channel
-        if self.config.channels.slack.enabled:
-            try:
-                from nanobot.channels.slack import SlackChannel
-                self.channels["slack"] = SlackChannel(
-                    self.config.channels.slack, self.bus
-                )
-                logger.info("Slack channel enabled")
-            except ImportError as e:
-                logger.warning("Slack channel not available: {}", e)
-
-        # QQ channel
-        if self.config.channels.qq.enabled:
-            try:
-                from nanobot.channels.qq import QQChannel
-                self.channels["qq"] = QQChannel(
-                    self.config.channels.qq,
-                    self.bus,
-                )
-                logger.info("QQ channel enabled")
-            except ImportError as e:
-                logger.warning("QQ channel not available: {}", e)
-
-        # Matrix channel
-        if self.config.channels.matrix.enabled:
-            try:
-                from nanobot.channels.matrix import MatrixChannel
-                self.channels["matrix"] = MatrixChannel(
-                    self.config.channels.matrix,
-                    self.bus,
-                )
-                logger.info("Matrix channel enabled")
-            except ImportError as e:
-                logger.warning("Matrix channel not available: {}", e)
-
-        # WeCom channel
-        if self.config.channels.wecom.enabled:
-            try:
-                from nanobot.channels.wecom import WecomChannel
-                self.channels["wecom"] = WecomChannel(
-                    self.config.channels.wecom,
-                    self.bus,
-                )
-                logger.info("WeCom channel enabled")
-            except ImportError as e:
-                logger.warning("WeCom channel not available: {}", e)
 
         self._validate_allow_from()
 

nanobot/channels/matrix.py

@@ -37,6 +37,7 @@ except ImportError as e:
     ) from e
 
 from nanobot.bus.events import OutboundMessage
+from nanobot.bus.queue import MessageBus
 from nanobot.channels.base import BaseChannel
 from nanobot.config.paths import get_data_dir, get_media_dir
 from nanobot.utils.helpers import safe_filename
@@ -146,15 +147,15 @@ class MatrixChannel(BaseChannel):
     """Matrix (Element) channel using long-polling sync."""
 
     name = "matrix"
+    display_name = "Matrix"
 
-    def __init__(self, config: Any, bus, *, restrict_to_workspace: bool = False,
+    def __init__(self, config: Any, bus: MessageBus):
-                 workspace: Path | None = None):
         super().__init__(config, bus)
         self.client: AsyncClient | None = None
         self._sync_task: asyncio.Task | None = None
         self._typing_tasks: dict[str, asyncio.Task] = {}
-        self._restrict_to_workspace = restrict_to_workspace
+        self._restrict_to_workspace = False
-        self._workspace = workspace.expanduser().resolve() if workspace else None
+        self._workspace: Path | None = None
         self._server_upload_limit_bytes: int | None = None
         self._server_upload_limit_checked = False
 
@@ -677,7 +678,14 @@ class MatrixChannel(BaseChannel):
         parts: list[str] = []
         if isinstance(body := getattr(event, "body", None), str) and body.strip():
             parts.append(body.strip())
-        if marker:
+
+        if attachment and attachment.get("type") == "audio":
+            transcription = await self.transcribe_audio(attachment["path"])
+            if transcription:
+                parts.append(f"[transcription: {transcription}]")
+            else:
+                parts.append(marker)
+        elif marker:
             parts.append(marker)
 
         await self._start_typing_keepalive(room.room_id)

nanobot/channels/mochat.py

@@ -216,6 +216,7 @@ class MochatChannel(BaseChannel):
     """Mochat channel using socket.io with fallback polling workers."""
 
     name = "mochat"
+    display_name = "Mochat"
 
     def __init__(self, config: MochatConfig, bus: MessageBus):
         super().__init__(config, bus)

nanobot/channels/qq.py

@@ -54,6 +54,7 @@ class QQChannel(BaseChannel):
     """QQ channel using botpy SDK with WebSocket connection."""
 
     name = "qq"
+    display_name = "QQ"
 
     def __init__(self, config: QQConfig, bus: MessageBus):
         super().__init__(config, bus)

nanobot/channels/registry.py

@@ -0,0 +1,35 @@
+"""Auto-discovery for channel modules — no hardcoded registry."""
+
+from __future__ import annotations
+
+import importlib
+import pkgutil
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from nanobot.channels.base import BaseChannel
+
+_INTERNAL = frozenset({"base", "manager", "registry"})
+
+
+def discover_channel_names() -> list[str]:
+    """Return all channel module names by scanning the package (zero imports)."""
+    import nanobot.channels as pkg
+
+    return [
+        name
+        for _, name, ispkg in pkgutil.iter_modules(pkg.__path__)
+        if name not in _INTERNAL and not ispkg
+    ]
+
+
+def load_channel_class(module_name: str) -> type[BaseChannel]:
+    """Import *module_name* and return the first BaseChannel subclass found."""
+    from nanobot.channels.base import BaseChannel as _Base
+
+    mod = importlib.import_module(f"nanobot.channels.{module_name}")
+    for attr in dir(mod):
+        obj = getattr(mod, attr)
+        if isinstance(obj, type) and issubclass(obj, _Base) and obj is not _Base:
+            return obj
+    raise ImportError(f"No BaseChannel subclass in nanobot.channels.{module_name}")

nanobot/channels/slack.py

@@ -21,6 +21,7 @@ class SlackChannel(BaseChannel):
     """Slack channel using Socket Mode."""
 
     name = "slack"
+    display_name = "Slack"
 
     def __init__(self, config: SlackConfig, bus: MessageBus):
         super().__init__(config, bus)

nanobot/channels/telegram.py

@@ -155,6 +155,7 @@ class TelegramChannel(BaseChannel):
     """
 
     name = "telegram"
+    display_name = "Telegram"
 
     # Commands registered with Telegram's command menu
     BOT_COMMANDS = [
@@ -164,15 +165,9 @@ class TelegramChannel(BaseChannel):
         BotCommand("help", "Show available commands"),
     ]
 
-    def __init__(
+    def __init__(self, config: TelegramConfig, bus: MessageBus):
-        self,
-        config: TelegramConfig,
-        bus: MessageBus,
-        groq_api_key: str = "",
-    ):
         super().__init__(config, bus)
         self.config: TelegramConfig = config
-        self.groq_api_key = groq_api_key
         self._app: Application | None = None
         self._chat_ids: dict[str, int] = {}  # Map sender_id to chat_id for replies
         self._typing_tasks: dict[str, asyncio.Task] = {}  # chat_id -> typing loop task
@@ -615,11 +610,8 @@ class TelegramChannel(BaseChannel):
 
                 media_paths.append(str(file_path))
 
-                # Handle voice transcription
+                if media_type in ("voice", "audio"):
-                if media_type == "voice" or media_type == "audio":
+                    transcription = await self.transcribe_audio(file_path)
-                    from nanobot.providers.transcription import GroqTranscriptionProvider
-                    transcriber = GroqTranscriptionProvider(api_key=self.groq_api_key)
-                    transcription = await transcriber.transcribe(file_path)
                     if transcription:
                         logger.info("Transcribed {}: {}...", media_type, transcription[:50])
                         content_parts.append(f"[transcription: {transcription}]")

nanobot/channels/wecom.py

@@ -36,6 +36,7 @@ class WecomChannel(BaseChannel):
     """
 
     name = "wecom"
+    display_name = "WeCom"
 
     def __init__(self, config: WecomConfig, bus: MessageBus):
         super().__init__(config, bus)

nanobot/channels/whatsapp.py

@@ -22,6 +22,7 @@ class WhatsAppChannel(BaseChannel):
     """
 
     name = "whatsapp"
+    display_name = "WhatsApp"
 
     def __init__(self, config: WhatsAppConfig, bus: MessageBus):
         super().__init__(config, bus)

nanobot/cli/commands.py

@@ -683,6 +683,7 @@ app.add_typer(channels_app, name="channels")
 @channels_app.command("status")
 def channels_status():
     """Show channel status."""
+    from nanobot.channels.registry import discover_channel_names, load_channel_class
     from nanobot.config.loader import load_config
 
     config = load_config()
@@ -690,85 +691,19 @@ def channels_status():
     table = Table(title="Channel Status")
     table.add_column("Channel", style="cyan")
     table.add_column("Enabled", style="green")
-    table.add_column("Configuration", style="yellow")
 
-    # WhatsApp
+    for modname in sorted(discover_channel_names()):
-    wa = config.channels.whatsapp
+        section = getattr(config.channels, modname, None)
-    table.add_row(
+        enabled = section and getattr(section, "enabled", False)
-        "WhatsApp",
+        try:
-        "✓" if wa.enabled else "✗",
+            cls = load_channel_class(modname)
-        wa.bridge_url
+            display = cls.display_name
-    )
+        except ImportError:
-
+            display = modname.title()
-    dc = config.channels.discord
+        table.add_row(
-    table.add_row(
+            display,
-        "Discord",
+            "[green]\u2713[/green]" if enabled else "[dim]\u2717[/dim]",
-        "✓" if dc.enabled else "✗",
+        )
-        dc.gateway_url
-    )
-
-    # Feishu
-    fs = config.channels.feishu
-    fs_config = f"app_id: {fs.app_id[:10]}..." if fs.app_id else "[dim]not configured[/dim]"
-    table.add_row(
-        "Feishu",
-        "✓" if fs.enabled else "✗",
-        fs_config
-    )
-
-    # Mochat
-    mc = config.channels.mochat
-    mc_base = mc.base_url or "[dim]not configured[/dim]"
-    table.add_row(
-        "Mochat",
-        "✓" if mc.enabled else "✗",
-        mc_base
-    )
-
-    # Telegram
-    tg = config.channels.telegram
-    tg_config = f"token: {tg.token[:10]}..." if tg.token else "[dim]not configured[/dim]"
-    table.add_row(
-        "Telegram",
-        "✓" if tg.enabled else "✗",
-        tg_config
-    )
-
-    # Slack
-    slack = config.channels.slack
-    slack_config = "socket" if slack.app_token and slack.bot_token else "[dim]not configured[/dim]"
-    table.add_row(
-        "Slack",
-        "✓" if slack.enabled else "✗",
-        slack_config
-    )
-
-    # DingTalk
-    dt = config.channels.dingtalk
-    dt_config = f"client_id: {dt.client_id[:10]}..." if dt.client_id else "[dim]not configured[/dim]"
-    table.add_row(
-        "DingTalk",
-        "✓" if dt.enabled else "✗",
-        dt_config
-    )
-
-    # QQ
-    qq = config.channels.qq
-    qq_config = f"app_id: {qq.app_id[:10]}..." if qq.app_id else "[dim]not configured[/dim]"
-    table.add_row(
-        "QQ",
-        "✓" if qq.enabled else "✗",
-        qq_config
-    )
-
-    # Email
-    em = config.channels.email
-    em_config = em.imap_host if em.imap_host else "[dim]not configured[/dim]"
-    table.add_row(
-        "Email",
-        "✓" if em.enabled else "✗",
-        em_config
-    )
 
     console.print(table)