messenger_channel

messenger_channel

MessengerChannel — Facebook Messenger adapter via pymessenger.

Classes

MessengerChannel

MessengerChannel(
    access_token: str = "",
    *,
    bus: Optional[EventBus] = None,
)

Bases: BaseChannel

Facebook Messenger channel adapter.

Uses the Messenger Platform Send API via pymessenger.

PARAMETER	DESCRIPTION
access_token	Facebook page access token. Falls back to MESSENGER_ACCESS_TOKEN env var. TYPE: str DEFAULT: ''
bus	Optional event bus for publishing channel events. TYPE: Optional[EventBus] DEFAULT: None

Source code in src/diapason/channels/messenger_channel.py

def __init__(
    self,
    access_token: str = "",
    *,
    bus: Optional[EventBus] = None,
) -> None:
    self._access_token = access_token or os.environ.get(
        "MESSENGER_ACCESS_TOKEN", ""
    )
    self._bus = bus
    self._handlers: List[ChannelHandler] = []
    self._status = ChannelStatus.DISCONNECTED

Methods:

connect

connect() -> None

Validate credentials and mark as connected.

Source code in src/diapason/channels/messenger_channel.py

def connect(self) -> None:
    """Validate credentials and mark as connected."""
    if not self._access_token:
        logger.warning("No Messenger access_token configured")
        self._status = ChannelStatus.ERROR
        return
    try:
        import pymessenger  # noqa: F401
    except ImportError:
        raise ImportError(
            "pymessenger not installed. Install with: "
            "uv sync --extra channel-messenger"
        )
    self._status = ChannelStatus.CONNECTED

disconnect

disconnect() -> None

Mark as disconnected.

Source code in src/diapason/channels/messenger_channel.py

def disconnect(self) -> None:
    """Mark as disconnected."""
    self._status = ChannelStatus.DISCONNECTED

send

send(
    channel: str,
    content: str,
    *,
    conversation_id: str = "",
    metadata: Dict[str, Any] | None = None,
) -> bool

Send a message to a Messenger user.

PARAMETER	DESCRIPTION
channel	Facebook user PSID to send to. TYPE: str
content	Text message content. TYPE: str

Source code in src/diapason/channels/messenger_channel.py

def send(
    self,
    channel: str,
    content: str,
    *,
    conversation_id: str = "",
    metadata: Dict[str, Any] | None = None,
) -> bool:
    """Send a message to a Messenger user.

    Parameters
    ----------
    channel:
        Facebook user PSID to send to.
    content:
        Text message content.
    """
    if not self._access_token:
        logger.warning("Cannot send: no Messenger credentials configured")
        return False

    try:
        from pymessenger import Bot

        bot = Bot(self._access_token)
        bot.send_text_message(channel, content)

        self._publish_sent(channel, content, conversation_id)
        return True
    except ImportError:
        logger.debug("pymessenger not installed")
        return False
    except Exception:
        logger.debug("Messenger send failed", exc_info=True)
        return False

status

status() -> ChannelStatus

Return the current connection status.

Source code in src/diapason/channels/messenger_channel.py

def status(self) -> ChannelStatus:
    """Return the current connection status."""
    return self._status

list_channels

list_channels() -> List[str]

Return available channel identifiers.

Source code in src/diapason/channels/messenger_channel.py

def list_channels(self) -> List[str]:
    """Return available channel identifiers."""
    return ["messenger"]

on_message

on_message(handler: ChannelHandler) -> None

Register a callback for incoming messages.

Source code in src/diapason/channels/messenger_channel.py

def on_message(self, handler: ChannelHandler) -> None:
    """Register a callback for incoming messages."""
    self._handlers.append(handler)