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Messager API Documentation

core.messager.messager.Messager

Asynchronous messaging client that supports multiple protocols.

This class provides a unified interface for messaging operations including publishing, subscribing, and handling messages. It supports different messaging protocols (default is MQTT) through pluggable drivers and includes features for:

  • Establishing secure connections with TLS/SSL support
  • Publishing and subscribing to topics
  • Message type validation through Pydantic models
  • Integrated logging with configurable levels
  • Asynchronous message handling

The client handles reconnection, message parsing, and provides a consistent API regardless of the underlying protocol implementation.

Source code in src/argentic/core/messager/messager.py 
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class Messager:
    """Asynchronous messaging client that supports multiple protocols.

    This class provides a unified interface for messaging operations including
    publishing, subscribing, and handling messages. It supports different messaging
    protocols (default is MQTT) through pluggable drivers and includes features for:

    - Establishing secure connections with TLS/SSL support
    - Publishing and subscribing to topics
    - Message type validation through Pydantic models
    - Integrated logging with configurable levels
    - Asynchronous message handling

    The client handles reconnection, message parsing, and provides a consistent
    API regardless of the underlying protocol implementation.
    """

    def __init__(
        self,
        broker_address: str,
        port: int = 1883,
        protocol: MessagerProtocol = MessagerProtocol.MQTT,
        client_id: str = "",
        username: Optional[str] = None,
        password: Optional[str] = None,
        keepalive: int = 60,
        pub_log_topic: Optional[str] = None,
        log_level: Union[LogLevel, str] = LogLevel.INFO,
        tls_params: Optional[Dict[str, Any]] = None,
        **driver_kwargs: Any,
    ):
        """Initialize a new Messager instance.

        Args:
            broker_address: Address of the message broker
            port: Broker port number
            protocol: Messaging protocol to use
            client_id: Unique client identifier, generated from timestamp if not provided
            username: Authentication username
            password: Authentication password
            keepalive: Keepalive interval in seconds
            pub_log_topic: Topic to publish log messages to, if any
            log_level: Logging level
            tls_params: TLS/SSL configuration parameters
            **driver_kwargs: Additional keyword arguments for the specific driver config
        """
        self.broker_address = broker_address
        self.port = port
        self.client_id = client_id or f"client-{int(time.time())}"
        self.username = username
        self.password = password
        self.keepalive = keepalive
        self.pub_log_topic = pub_log_topic

        if isinstance(log_level, str):
            self.log_level = parse_log_level(log_level)
        else:
            self.log_level = log_level

        # Use client_id in logger name for clarity if multiple clients run
        self.logger = get_logger(f"messager.{self.client_id}", level=self.log_level)

        self._tls_params: Optional[Dict[str, Any]] = None
        if tls_params:
            try:
                self._tls_params = {
                    "ca_certs": tls_params.get("ca_certs"),
                    "certfile": tls_params.get("certfile"),
                    "keyfile": tls_params.get("keyfile"),
                    "cert_reqs": getattr(
                        ssl, tls_params.get("cert_reqs", "CERT_REQUIRED"), ssl.CERT_REQUIRED
                    ),
                    "tls_version": getattr(
                        ssl, tls_params.get("tls_version", "PROTOCOL_TLS"), ssl.PROTOCOL_TLS
                    ),
                    "ciphers": tls_params.get("ciphers"),
                }
                self.logger.info("TLS parameters configured.")
            except Exception as e:
                self.logger.error(f"Failed to configure TLS parameters: {e}", exc_info=True)
                raise ValueError(f"Invalid TLS configuration: {e}") from e

        # Prepare driver config
        config_data = {
            "url": broker_address,
            "port": port,
            "user": username,
            "password": password,
            "client_id": self.client_id,
            "keepalive": keepalive,
            **driver_kwargs,
        }

        self._driver = create_driver(protocol, config_data)

        # ------------------------------------------------------------------
        # Internal registry of handlers per topic. This allows us to attach
        # *multiple* high-level handlers to the same MQTT topic while issuing
        # only ONE subscription to the underlying driver. Each incoming
        # payload is then dispatched to every registered (handler,
        # message_cls) pair.  This prevents the "second subscription
        # overwrites the first" broker behaviour from dropping messages.
        # ------------------------------------------------------------------
        self._topic_handlers: Dict[str, List[tuple[MessageHandler, type]]] = {}
        # Store the dispatcher adapter we created for each topic so we can
        # cleanly unsubscribe later if needed.
        self._topic_dispatchers: Dict[str, MessageHandler] = {}

    def is_connected(self) -> bool:
        """Check if the client is currently connected.

        Returns:
            bool: True if connected, False otherwise
        """
        return self._driver.is_connected()

    async def connect(self) -> bool:
        """Connect to the message broker using the configured driver.

        Returns:
            bool: True if connection was successful, False otherwise
        """
        try:
            await self._driver.connect()
            self.logger.info("Connected successfully via driver")
            return True
        except Exception as e:
            log_msg = f"Driver connection failed: {e!r}"
            # Attempt to get more detailed error information from the driver
            if hasattr(self._driver, "format_connection_error_details"):
                detailed_error_info = self._driver.format_connection_error_details(e)
                if detailed_error_info:
                    log_msg += f"\n--- Driver Specific Error Details ---\n{detailed_error_info}"
                    log_msg += "\n-------------------------------------"
            self.logger.error(log_msg, exc_info=True)  # exc_info=True will add traceback
            return False

    async def disconnect(self) -> None:
        """Disconnect from the message broker."""
        await self._driver.disconnect()

    async def publish(
        self, topic: str, payload: BaseMessage, qos: int = 0, retain: bool = False
    ) -> None:
        """Publish a message to the specified topic.

        Args:
            topic: Topic to publish the message to
            payload: Message payload object
            qos: Quality of Service level (0, 1, or 2)
            retain: Whether the message should be retained by the broker
        """
        await self._driver.publish(topic, payload, qos=qos, retain=retain)

    async def subscribe(
        self,
        topic: str,
        handler: MessageHandler,
        message_cls: Type[BaseMessage] = BaseMessage,
        **kwargs,
    ) -> None:
        """Subscribe to a topic with the specified message handler.

        Args:
            topic: Topic pattern to subscribe to
            handler: Callback function to handle received messages
            message_cls: Message class for parsing received payloads
            **kwargs: Additional arguments passed to the underlying driver
        """

        self.logger.info(
            f"Registering handler {handler.__name__} (cls={message_cls.__name__}) for topic '{topic}'"
        )

        # Lazily create the dispatcher for this topic on first registration
        if topic not in self._topic_handlers:
            self._topic_handlers[topic] = []

            async def _dispatcher(payload: BaseMessage) -> None:
                """Dispatch an incoming BaseMessage to all registered
                (handler, message_cls) pairs for this topic."""

                # Create a snapshot of handlers to avoid mutation-during-iter
                for _handler, _cls in list(self._topic_handlers.get(topic, [])):
                    if _cls is not BaseMessage:
                        expected_type = None

                        # 1️⃣ Literal annotation check
                        if hasattr(_cls, "__annotations__"):
                            type_annotation = _cls.__annotations__.get("type")
                            if (
                                type_annotation
                                and hasattr(type_annotation, "__args__")
                                and type_annotation.__args__
                            ):
                                expected_type = type_annotation.__args__[0]

                        # 2️⃣ Default field value fallback
                        if expected_type is None:
                            model_fields = getattr(_cls, "model_fields", None)
                            if model_fields is not None:
                                type_field = (
                                    model_fields.get("type")
                                    if isinstance(model_fields, dict)
                                    else None
                                )
                                if type_field and hasattr(type_field, "default"):
                                    expected_type = type_field.default
                            else:
                                expected_type = getattr(_cls, "type", None)

                        if expected_type and payload.type != expected_type:
                            # Not the right message type for this handler – skip
                            continue

                        try:
                            original_json = getattr(payload, "_original_json", None)
                            validate_json = getattr(_cls, "model_validate_json", None)
                            if original_json and callable(validate_json):
                                specific_msg = validate_json(original_json)
                            else:
                                # Fallback to generic model_validate (runtime checked)
                                specific_msg = getattr(_cls, "model_validate")(payload.model_dump())

                            await _handler(specific_msg)  # type: ignore[arg-type]
                        except ValidationError:
                            # Silent skip if validation fails – another handler might match
                            continue
                        except Exception as exc:
                            self.logger.error(
                                f"Error in handler {_handler.__name__} for topic '{topic}': {exc}",
                                exc_info=True,
                            )
                    else:
                        # Generic BaseMessage handler – forward as-is
                        try:
                            await _handler(payload)
                        except Exception as exc:
                            self.logger.error(
                                f"Error in handler {_handler.__name__} for topic '{topic}': {exc}",
                                exc_info=True,
                            )

            # Save dispatcher so we can unsubscribe later
            self._topic_dispatchers[topic] = _dispatcher

            # Only the FIRST registration performs the low-level subscribe
            await self._driver.subscribe(topic, _dispatcher, **kwargs)

        # Always register the (handler, message_cls) pair in local registry
        self._topic_handlers[topic].append((handler, message_cls))

    async def unsubscribe(self, topic: str) -> None:
        """Unsubscribe from a previously subscribed topic.

        Args:
            topic: Topic to unsubscribe from
        """
        if hasattr(self._driver, "unsubscribe"):
            await self._driver.unsubscribe(topic)

    async def log(self, message: str, level: str = "info") -> None:
        """Publish a log message to the configured log topic.

        Args:
            message: The log message text
            level: Log level (info, debug, warning, error, critical)
        """
        if not self.pub_log_topic:
            self.logger.debug(f"Log message not sent (no pub_log_topic): [{level}] {message}")
            return

        try:
            log_payload = BaseMessage(
                type="log",
                source=self.client_id,
                data={
                    "timestamp": time.time(),
                    "level": level,
                    "message": message,
                },
            )

            # publish uses driver internally
            await self.publish(self.pub_log_topic, log_payload)
        except Exception as e:
            self.logger.error(f"Failed to publish log message: {e}", exc_info=True)

    async def stop(self) -> None:
        """Stop the messager client, disconnecting from broker and cleaning up resources.

        This is an alias for disconnect() to provide a consistent interface.
        """
        await self.disconnect()

__init__(broker_address, port=1883, protocol=MessagerProtocol.MQTT, client_id='', username=None, password=None, keepalive=60, pub_log_topic=None, log_level=LogLevel.INFO, tls_params=None, **driver_kwargs)

Initialize a new Messager instance.

Parameters:

Name Type Description Default
broker_address str

Address of the message broker

 required
port int

Broker port number

 1883
protocol MessagerProtocol

Messaging protocol to use

 MQTT
client_id str

Unique client identifier, generated from timestamp if not provided

 ''
username Optional[str]

Authentication username

 None
password Optional[str]

Authentication password

 None
keepalive int

Keepalive interval in seconds

 60
pub_log_topic Optional[str]

Topic to publish log messages to, if any

 None
log_level Union[LogLevel, str]

Logging level

 INFO
tls_params Optional[Dict[str, Any]]

TLS/SSL configuration parameters

 None
**driver_kwargs Any

Additional keyword arguments for the specific driver config

 {}
Source code in src/argentic/core/messager/messager.py 
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def __init__(
    self,
    broker_address: str,
    port: int = 1883,
    protocol: MessagerProtocol = MessagerProtocol.MQTT,
    client_id: str = "",
    username: Optional[str] = None,
    password: Optional[str] = None,
    keepalive: int = 60,
    pub_log_topic: Optional[str] = None,
    log_level: Union[LogLevel, str] = LogLevel.INFO,
    tls_params: Optional[Dict[str, Any]] = None,
    **driver_kwargs: Any,
):
    """Initialize a new Messager instance.

    Args:
        broker_address: Address of the message broker
        port: Broker port number
        protocol: Messaging protocol to use
        client_id: Unique client identifier, generated from timestamp if not provided
        username: Authentication username
        password: Authentication password
        keepalive: Keepalive interval in seconds
        pub_log_topic: Topic to publish log messages to, if any
        log_level: Logging level
        tls_params: TLS/SSL configuration parameters
        **driver_kwargs: Additional keyword arguments for the specific driver config
    """
    self.broker_address = broker_address
    self.port = port
    self.client_id = client_id or f"client-{int(time.time())}"
    self.username = username
    self.password = password
    self.keepalive = keepalive
    self.pub_log_topic = pub_log_topic

    if isinstance(log_level, str):
        self.log_level = parse_log_level(log_level)
    else:
        self.log_level = log_level

    # Use client_id in logger name for clarity if multiple clients run
    self.logger = get_logger(f"messager.{self.client_id}", level=self.log_level)

    self._tls_params: Optional[Dict[str, Any]] = None
    if tls_params:
        try:
            self._tls_params = {
                "ca_certs": tls_params.get("ca_certs"),
                "certfile": tls_params.get("certfile"),
                "keyfile": tls_params.get("keyfile"),
                "cert_reqs": getattr(
                    ssl, tls_params.get("cert_reqs", "CERT_REQUIRED"), ssl.CERT_REQUIRED
                ),
                "tls_version": getattr(
                    ssl, tls_params.get("tls_version", "PROTOCOL_TLS"), ssl.PROTOCOL_TLS
                ),
                "ciphers": tls_params.get("ciphers"),
            }
            self.logger.info("TLS parameters configured.")
        except Exception as e:
            self.logger.error(f"Failed to configure TLS parameters: {e}", exc_info=True)
            raise ValueError(f"Invalid TLS configuration: {e}") from e

    # Prepare driver config
    config_data = {
        "url": broker_address,
        "port": port,
        "user": username,
        "password": password,
        "client_id": self.client_id,
        "keepalive": keepalive,
        **driver_kwargs,
    }

    self._driver = create_driver(protocol, config_data)

    # ------------------------------------------------------------------
    # Internal registry of handlers per topic. This allows us to attach
    # *multiple* high-level handlers to the same MQTT topic while issuing
    # only ONE subscription to the underlying driver. Each incoming
    # payload is then dispatched to every registered (handler,
    # message_cls) pair.  This prevents the "second subscription
    # overwrites the first" broker behaviour from dropping messages.
    # ------------------------------------------------------------------
    self._topic_handlers: Dict[str, List[tuple[MessageHandler, type]]] = {}
    # Store the dispatcher adapter we created for each topic so we can
    # cleanly unsubscribe later if needed.
    self._topic_dispatchers: Dict[str, MessageHandler] = {}

connect() async

Connect to the message broker using the configured driver.

Returns:

Name Type Description
bool bool

True if connection was successful, False otherwise
Source code in src/argentic/core/messager/messager.py 
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async def connect(self) -> bool:
    """Connect to the message broker using the configured driver.

    Returns:
        bool: True if connection was successful, False otherwise
    """
    try:
        await self._driver.connect()
        self.logger.info("Connected successfully via driver")
        return True
    except Exception as e:
        log_msg = f"Driver connection failed: {e!r}"
        # Attempt to get more detailed error information from the driver
        if hasattr(self._driver, "format_connection_error_details"):
            detailed_error_info = self._driver.format_connection_error_details(e)
            if detailed_error_info:
                log_msg += f"\n--- Driver Specific Error Details ---\n{detailed_error_info}"
                log_msg += "\n-------------------------------------"
        self.logger.error(log_msg, exc_info=True)  # exc_info=True will add traceback
        return False

disconnect() async

Disconnect from the message broker.

Source code in src/argentic/core/messager/messager.py 
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async def disconnect(self) -> None:
    """Disconnect from the message broker."""
    await self._driver.disconnect()

is_connected()

Check if the client is currently connected.

Returns:

Name Type Description
bool bool

True if connected, False otherwise
Source code in src/argentic/core/messager/messager.py 
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def is_connected(self) -> bool:
    """Check if the client is currently connected.

    Returns:
        bool: True if connected, False otherwise
    """
    return self._driver.is_connected()

log(message, level='info') async

Publish a log message to the configured log topic.

Parameters:

Name Type Description Default
message str

The log message text

 required
level str

Log level (info, debug, warning, error, critical)

 'info'
Source code in src/argentic/core/messager/messager.py 
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async def log(self, message: str, level: str = "info") -> None:
    """Publish a log message to the configured log topic.

    Args:
        message: The log message text
        level: Log level (info, debug, warning, error, critical)
    """
    if not self.pub_log_topic:
        self.logger.debug(f"Log message not sent (no pub_log_topic): [{level}] {message}")
        return

    try:
        log_payload = BaseMessage(
            type="log",
            source=self.client_id,
            data={
                "timestamp": time.time(),
                "level": level,
                "message": message,
            },
        )

        # publish uses driver internally
        await self.publish(self.pub_log_topic, log_payload)
    except Exception as e:
        self.logger.error(f"Failed to publish log message: {e}", exc_info=True)

publish(topic, payload, qos=0, retain=False) async

Publish a message to the specified topic.

Parameters:

Name Type Description Default
topic str

Topic to publish the message to

 required
payload BaseMessage

Message payload object

 required
qos int

Quality of Service level (0, 1, or 2)

 0
retain bool

Whether the message should be retained by the broker

 False
Source code in src/argentic/core/messager/messager.py 
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async def publish(
    self, topic: str, payload: BaseMessage, qos: int = 0, retain: bool = False
) -> None:
    """Publish a message to the specified topic.

    Args:
        topic: Topic to publish the message to
        payload: Message payload object
        qos: Quality of Service level (0, 1, or 2)
        retain: Whether the message should be retained by the broker
    """
    await self._driver.publish(topic, payload, qos=qos, retain=retain)

stop() async

Stop the messager client, disconnecting from broker and cleaning up resources.

This is an alias for disconnect() to provide a consistent interface.

Source code in src/argentic/core/messager/messager.py 
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async def stop(self) -> None:
    """Stop the messager client, disconnecting from broker and cleaning up resources.

    This is an alias for disconnect() to provide a consistent interface.
    """
    await self.disconnect()

subscribe(topic, handler, message_cls=BaseMessage, **kwargs) async

Subscribe to a topic with the specified message handler.

Parameters:

Name Type Description Default
topic str

Topic pattern to subscribe to

 required
handler MessageHandler

Callback function to handle received messages

 required
message_cls Type[BaseMessage]

Message class for parsing received payloads

 BaseMessage
**kwargs

Additional arguments passed to the underlying driver

 {}
Source code in src/argentic/core/messager/messager.py 
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async def subscribe(
    self,
    topic: str,
    handler: MessageHandler,
    message_cls: Type[BaseMessage] = BaseMessage,
    **kwargs,
) -> None:
    """Subscribe to a topic with the specified message handler.

    Args:
        topic: Topic pattern to subscribe to
        handler: Callback function to handle received messages
        message_cls: Message class for parsing received payloads
        **kwargs: Additional arguments passed to the underlying driver
    """

    self.logger.info(
        f"Registering handler {handler.__name__} (cls={message_cls.__name__}) for topic '{topic}'"
    )

    # Lazily create the dispatcher for this topic on first registration
    if topic not in self._topic_handlers:
        self._topic_handlers[topic] = []

        async def _dispatcher(payload: BaseMessage) -> None:
            """Dispatch an incoming BaseMessage to all registered
            (handler, message_cls) pairs for this topic."""

            # Create a snapshot of handlers to avoid mutation-during-iter
            for _handler, _cls in list(self._topic_handlers.get(topic, [])):
                if _cls is not BaseMessage:
                    expected_type = None

                    # 1️⃣ Literal annotation check
                    if hasattr(_cls, "__annotations__"):
                        type_annotation = _cls.__annotations__.get("type")
                        if (
                            type_annotation
                            and hasattr(type_annotation, "__args__")
                            and type_annotation.__args__
                        ):
                            expected_type = type_annotation.__args__[0]

                    # 2️⃣ Default field value fallback
                    if expected_type is None:
                        model_fields = getattr(_cls, "model_fields", None)
                        if model_fields is not None:
                            type_field = (
                                model_fields.get("type")
                                if isinstance(model_fields, dict)
                                else None
                            )
                            if type_field and hasattr(type_field, "default"):
                                expected_type = type_field.default
                        else:
                            expected_type = getattr(_cls, "type", None)

                    if expected_type and payload.type != expected_type:
                        # Not the right message type for this handler – skip
                        continue

                    try:
                        original_json = getattr(payload, "_original_json", None)
                        validate_json = getattr(_cls, "model_validate_json", None)
                        if original_json and callable(validate_json):
                            specific_msg = validate_json(original_json)
                        else:
                            # Fallback to generic model_validate (runtime checked)
                            specific_msg = getattr(_cls, "model_validate")(payload.model_dump())

                        await _handler(specific_msg)  # type: ignore[arg-type]
                    except ValidationError:
                        # Silent skip if validation fails – another handler might match
                        continue
                    except Exception as exc:
                        self.logger.error(
                            f"Error in handler {_handler.__name__} for topic '{topic}': {exc}",
                            exc_info=True,
                        )
                else:
                    # Generic BaseMessage handler – forward as-is
                    try:
                        await _handler(payload)
                    except Exception as exc:
                        self.logger.error(
                            f"Error in handler {_handler.__name__} for topic '{topic}': {exc}",
                            exc_info=True,
                        )

        # Save dispatcher so we can unsubscribe later
        self._topic_dispatchers[topic] = _dispatcher

        # Only the FIRST registration performs the low-level subscribe
        await self._driver.subscribe(topic, _dispatcher, **kwargs)

    # Always register the (handler, message_cls) pair in local registry
    self._topic_handlers[topic].append((handler, message_cls))

unsubscribe(topic) async

Unsubscribe from a previously subscribed topic.

Parameters:

Name Type Description Default
topic str

Topic to unsubscribe from

 required
Source code in src/argentic/core/messager/messager.py 
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async def unsubscribe(self, topic: str) -> None:
    """Unsubscribe from a previously subscribed topic.

    Args:
        topic: Topic to unsubscribe from
    """
    if hasattr(self._driver, "unsubscribe"):
        await self._driver.unsubscribe(topic)