# Copyright 2015 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License.  You
# may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.  See the License for the specific language governing
# permissions and limitations under the License.

"""Tools to monitor driver events.

Use :func:`register` to register global listeners for specific events.
Currently only command events are published. Listeners must be
a subclass of :class:`CommandListener` and implement
:meth:`~CommandListener.started`, :meth:`~CommandListener.succeeded`, and
:meth:`~CommandListener.failed`.

For example, a simple command logger might be implemented like this::

    import logging

    from pymongo import monitoring

    class CommandLogger(monitoring.CommandListener):

        def started(self, event):
            logging.info("Command {0.command_name} with request id "
                         "{0.request_id} started on server "
                         "{0.connection_id}".format(event))

        def succeeded(self, event):
            logging.info("Command {0.command_name} with request id "
                         "{0.request_id} on server {0.connection_id} "
                         "succeeded in {0.duration_micros} "
                         "microseconds".format(event))

        def failed(self, event):
            logging.info("Command {0.command_name} with request id "
                         "{0.request_id} on server {0.connection_id} "
                         "failed in {0.duration_micros} "
                         "microseconds".format(event))

    monitoring.register(CommandLogger())

Event listeners can also be registered per instance of
:class:`~pymongo.mongo_client.MongoClient`::

    client = MongoClient(event_listeners=[CommandLogger()])

Note that previously registered global listeners are automatically included when
configuring per client event listeners. Registering a new global listener will
not add that listener to existing client instances.

.. note:: Events are delivered **synchronously**. Application threads block
  waiting for event handlers (e.g. :meth:`~CommandListener.started`) to
  return. Care must be taken to ensure that your event handlers are efficient
  enough to not adversely affect overall application performance.

.. warning:: The command documents published through this API are *not* copies.
  If you intend to modify them in any way you must copy them in your event
  handler first.
"""

import sys
import traceback

from collections import namedtuple, Sequence

_Listeners = namedtuple('Listeners', ('command_listeners',))

_LISTENERS = _Listeners([])


class CommandListener(object):
    """Abstract base class for command listeners."""

    def started(self, event):
        """Abstract method to handle CommandStartedEvent.

        :Parameters:
          - `event`: An instance of :class:`CommandStartedEvent`
        """
        raise NotImplementedError

    def succeeded(self, event):
        """Abstract method to handle CommandSucceededEvent.

        :Parameters:
          - `event`: An instance of :class:`CommandSucceededEvent`
        """
        raise NotImplementedError

    def failed(self, event):
        """Abstract method to handle CommandFailedEvent.

        :Parameters:
          - `event`: An instance of :class:`CommandFailedEvent`
        """
        raise NotImplementedError


def _to_micros(dur):
    """Convert duration 'dur' to microseconds."""
    if hasattr(dur, 'total_seconds'):
        return int(dur.total_seconds() * 10e5)
    # Python 2.6
    return dur.microseconds + (dur.seconds + dur.days * 24 * 3600) * 1000000


def _validate_event_listeners(option, listeners):
    """Validate event listeners"""
    if not isinstance(listeners, Sequence):
        raise TypeError("%s must be a list or tuple" % (option,))
    for listener in listeners:
        if not isinstance(listener, CommandListener):
            raise TypeError("Only subclasses of "
                            "pymongo.monitoring.CommandListener are supported")
    return listeners


def register(listener):
    """Register a global event listener.

    :Parameters:
      - `listener`: A subclass of :class:`CommandListener`.
    """
    _validate_event_listeners('listener', [listener])
    _LISTENERS.command_listeners.append(listener)


def _handle_exception():
    """Print exceptions raised by subscribers to stderr."""
    # Heavily influenced by logging.Handler.handleError.

    # See note here:
    # https://docs.python.org/3.4/library/sys.html#sys.__stderr__
    if sys.stderr:
        einfo = sys.exc_info()
        try:
            traceback.print_exception(einfo[0], einfo[1], einfo[2],
                                      None, sys.stderr)
        except IOError:
            pass
        finally:
            del einfo

# Note - to avoid bugs from forgetting which if these is all lowercase and
# which are camelCase, and at the same time avoid having to add a test for
# every command, use all lowercase here and test against command_name.lower().
_SENSITIVE_COMMANDS = set(
    ["authenticate", "saslstart", "saslcontinue", "getnonce", "createuser",
     "updateuser", "copydbgetnonce", "copydbsaslstart", "copydb"])


class _CommandEvent(object):
    """Base class for command events."""

    __slots__ = ("__cmd_name", "__rqst_id", "__conn_id", "__op_id")

    def __init__(self, command_name, request_id, connection_id, operation_id):
        self.__cmd_name = command_name
        self.__rqst_id = request_id
        self.__conn_id = connection_id
        self.__op_id = operation_id

    @property
    def command_name(self):
        """The command name."""
        return self.__cmd_name

    @property
    def request_id(self):
        """The request id for this operation."""
        return self.__rqst_id

    @property
    def connection_id(self):
        """The address (host, port) of the server this command was sent to."""
        return self.__conn_id

    @property
    def operation_id(self):
        """An id for this series of events or None."""
        return self.__op_id


class CommandStartedEvent(_CommandEvent):
    """Event published when a command starts.

    :Parameters:
      - `command`: The command document.
      - `database_name`: The name of the database this command was run against.
      - `request_id`: The request id for this operation.
      - `connection_id`: The address (host, port) of the server this command
        was sent to.
      - `operation_id`: An optional identifier for a series of related events.
    """
    __slots__ = ("__cmd", "__db")

    def __init__(self, command, database_name, *args):
        if not command:
            raise ValueError("%r is not a valid command" % (command,))
        # Command name must be first key.
        command_name = next(iter(command))
        super(CommandStartedEvent, self).__init__(command_name, *args)
        if command_name.lower() in _SENSITIVE_COMMANDS:
            self.__cmd = {}
        else:
            self.__cmd = command
        self.__db = database_name

    @property
    def command(self):
        """The command document."""
        return self.__cmd

    @property
    def database_name(self):
        """The name of the database this command was run against."""
        return self.__db


class CommandSucceededEvent(_CommandEvent):
    """Event published when a command succeeds.

    :Parameters:
      - `duration`: The command duration as a datetime.timedelta.
      - `reply`: The server reply document.
      - `command_name`: The command name.
      - `request_id`: The request id for this operation.
      - `connection_id`: The address (host, port) of the server this command
        was sent to.
      - `operation_id`: An optional identifier for a series of related events.
    """
    __slots__ = ("__duration_micros", "__reply")

    def __init__(self, duration, reply, command_name,
                 request_id, connection_id, operation_id):
        super(CommandSucceededEvent, self).__init__(
            command_name, request_id, connection_id, operation_id)
        self.__duration_micros = _to_micros(duration)
        if command_name.lower() in _SENSITIVE_COMMANDS:
            self.__reply = {}
        else:
            self.__reply = reply

    @property
    def duration_micros(self):
        """The duration of this operation in microseconds."""
        return self.__duration_micros

    @property
    def reply(self):
        """The server failure document for this operation."""
        return self.__reply


class CommandFailedEvent(_CommandEvent):
    """Event published when a command fails.

    :Parameters:
      - `duration`: The command duration as a datetime.timedelta.
      - `failure`: The server reply document.
      - `command_name`: The command name.
      - `request_id`: The request id for this operation.
      - `connection_id`: The address (host, port) of the server this command
        was sent to.
      - `operation_id`: An optional identifier for a series of related events.
    """
    __slots__ = ("__duration_micros", "__failure")

    def __init__(self, duration, failure, *args):
        super(CommandFailedEvent, self).__init__(*args)
        self.__duration_micros = _to_micros(duration)
        self.__failure = failure

    @property
    def duration_micros(self):
        """The duration of this operation in microseconds."""
        return self.__duration_micros

    @property
    def failure(self):
        """The server failure document for this operation."""
        return self.__failure


class _EventListeners(object):
    """Configure event listeners for a client instance.

    Any event listeners registered globally are included by default.

    :Parameters:
      - `listeners`: A list of event listeners.
    """
    def __init__(self, listeners):
        self.__command_listeners = _LISTENERS.command_listeners[:]
        if listeners is not None:
            self.__command_listeners.extend(listeners)
        self.__enabled_for_commands = bool(self.__command_listeners)

    @property
    def enabled_for_commands(self):
        """Are any CommandListener instances registered?"""
        return self.__enabled_for_commands

    @property
    def event_listeners(self):
        """List of registered event listeners."""
        return self.__command_listeners[:]

    def publish_command_start(self, command, database_name,
                              request_id, connection_id, op_id=None):
        """Publish a CommandStartedEvent to all command listeners.

        :Parameters:
          - `command`: The command document.
          - `database_name`: The name of the database this command was run
            against.
          - `request_id`: The request id for this operation.
          - `connection_id`: The address (host, port) of the server this
            command was sent to.
          - `op_id`: The (optional) operation id for this operation.
        """
        if op_id is None:
            op_id = request_id
        event = CommandStartedEvent(
            command, database_name, request_id, connection_id, op_id)
        for subscriber in self.__command_listeners:
            try:
                subscriber.started(event)
            except Exception:
                _handle_exception()


    def publish_command_success(self, duration, reply, command_name,
                                request_id, connection_id, op_id=None):
        """Publish a CommandSucceededEvent to all command listeners.

        :Parameters:
          - `duration`: The command duration as a datetime.timedelta.
          - `reply`: The server reply document.
          - `command_name`: The command name.
          - `request_id`: The request id for this operation.
          - `connection_id`: The address (host, port) of the server this
            command was sent to.
          - `op_id`: The (optional) operation id for this operation.
        """
        if op_id is None:
            op_id = request_id
        event = CommandSucceededEvent(
            duration, reply, command_name, request_id, connection_id, op_id)
        for subscriber in self.__command_listeners:
            try:
                subscriber.succeeded(event)
            except Exception:
                _handle_exception()


    def publish_command_failure(self, duration, failure, command_name,
                                request_id, connection_id, op_id=None):
        """Publish a CommandFailedEvent to all command listeners.

        :Parameters:
          - `duration`: The command duration as a datetime.timedelta.
          - `failure`: The server reply document or failure description
            document.
          - `command_name`: The command name.
          - `request_id`: The request id for this operation.
          - `connection_id`: The address (host, port) of the server this
            command was sent to.
          - `op_id`: The (optional) operation id for this operation.
        """
        if op_id is None:
            op_id = request_id
        event = CommandFailedEvent(
            duration, failure, command_name, request_id, connection_id, op_id)
        for subscriber in self.__command_listeners:
            try:
                subscriber.failed(event)
            except Exception:
                _handle_exception()

# Copyright 2015 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License.  You
# may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.  See the License for the specific language governing
# permissions and limitations under the License.

"""Tools to monitor driver events.

Use :func:`register` to register global listeners for specific events.
Currently only command events are published. Listeners must be
a subclass of :class:`CommandListener` and implement
:meth:`~CommandListener.started`, :meth:`~CommandListener.succeeded`, and
:meth:`~CommandListener.failed`.

For example, a simple command logger might be implemented like this::

    import logging

    from pymongo import monitoring

    class CommandLogger(monitoring.CommandListener):

        def started(self, event):
            logging.info("Command {0.command_name} with request id "
                         "{0.request_id} started on server "
                         "{0.connection_id}".format(event))

        def succeeded(self, event):
            logging.info("Command {0.command_name} with request id "
                         "{0.request_id} on server {0.connection_id} "
                         "succeeded in {0.duration_micros} "
                         "microseconds".format(event))

        def failed(self, event):
            logging.info("Command {0.command_name} with request id "
                         "{0.request_id} on server {0.connection_id} "
                         "failed in {0.duration_micros} "
                         "microseconds".format(event))

    monitoring.register(CommandLogger())

Event listeners can also be registered per instance of
:class:`~pymongo.mongo_client.MongoClient`::

    client = MongoClient(event_listeners=[CommandLogger()])

Note that previously registered global listeners are automatically included when
configuring per client event listeners. Registering a new global listener will
not add that listener to existing client instances.

.. note:: Events are delivered **synchronously**. Application threads block
  waiting for event handlers (e.g. :meth:`~CommandListener.started`) to
  return. Care must be taken to ensure that your event handlers are efficient
  enough to not adversely affect overall application performance.

.. warning:: The command documents published through this API are *not* copies.
  If you intend to modify them in any way you must copy them in your event
  handler first.
"""

import sys
import traceback

from collections import namedtuple, Sequence

_Listeners = namedtuple('Listeners', ('command_listeners',))

_LISTENERS = _Listeners([])


class CommandListener(object):
    """Abstract base class for command listeners."""

    def started(self, event):
        """Abstract method to handle CommandStartedEvent.

        :Parameters:
          - `event`: An instance of :class:`CommandStartedEvent`
        """
        raise NotImplementedError

    def succeeded(self, event):
        """Abstract method to handle CommandSucceededEvent.

        :Parameters:
          - `event`: An instance of :class:`CommandSucceededEvent`
        """
        raise NotImplementedError

    def failed(self, event):
        """Abstract method to handle CommandFailedEvent.

        :Parameters:
          - `event`: An instance of :class:`CommandFailedEvent`
        """
        raise NotImplementedError


def _to_micros(dur):
    """Convert duration 'dur' to microseconds."""
    if hasattr(dur, 'total_seconds'):
        return int(dur.total_seconds() * 10e5)
    # Python 2.6
    return dur.microseconds + (dur.seconds + dur.days * 24 * 3600) * 1000000


def _validate_event_listeners(option, listeners):
    """Validate event listeners"""
    if not isinstance(listeners, Sequence):
        raise TypeError("%s must be a list or tuple" % (option,))
    for listener in listeners:
        if not isinstance(listener, CommandListener):
            raise TypeError("Only subclasses of "
                            "pymongo.monitoring.CommandListener are supported")
    return listeners


def register(listener):
    """Register a global event listener.

    :Parameters:
      - `listener`: A subclass of :class:`CommandListener`.
    """
    _validate_event_listeners('listener', [listener])
    _LISTENERS.command_listeners.append(listener)


def _handle_exception():
    """Print exceptions raised by subscribers to stderr."""
    # Heavily influenced by logging.Handler.handleError.

    # See note here:
    # https://docs.python.org/3.4/library/sys.html#sys.__stderr__
    if sys.stderr:
        einfo = sys.exc_info()
        try:
            traceback.print_exception(einfo[0], einfo[1], einfo[2],
                                      None, sys.stderr)
        except IOError:
            pass
        finally:
            del einfo

# Note - to avoid bugs from forgetting which if these is all lowercase and
# which are camelCase, and at the same time avoid having to add a test for
# every command, use all lowercase here and test against command_name.lower().
_SENSITIVE_COMMANDS = set(
    ["authenticate", "saslstart", "saslcontinue", "getnonce", "createuser",
     "updateuser", "copydbgetnonce", "copydbsaslstart", "copydb"])


class _CommandEvent(object):
    """Base class for command events."""

    __slots__ = ("__cmd_name", "__rqst_id", "__conn_id", "__op_id")

    def __init__(self, command_name, request_id, connection_id, operation_id):
        self.__cmd_name = command_name
        self.__rqst_id = request_id
        self.__conn_id = connection_id
        self.__op_id = operation_id

    @property
    def command_name(self):
        """The command name."""
        return self.__cmd_name

    @property
    def request_id(self):
        """The request id for this operation."""
        return self.__rqst_id

    @property
    def connection_id(self):
        """The address (host, port) of the server this command was sent to."""
        return self.__conn_id

    @property
    def operation_id(self):
        """An id for this series of events or None."""
        return self.__op_id


class CommandStartedEvent(_CommandEvent):
    """Event published when a command starts.

    :Parameters:
      - `command`: The command document.
      - `database_name`: The name of the database this command was run against.
      - `request_id`: The request id for this operation.
      - `connection_id`: The address (host, port) of the server this command
        was sent to.
      - `operation_id`: An optional identifier for a series of related events.
    """
    __slots__ = ("__cmd", "__db")

    def __init__(self, command, database_name, *args):
        if not command:
            raise ValueError("%r is not a valid command" % (command,))
        # Command name must be first key.
        command_name = next(iter(command))
        super(CommandStartedEvent, self).__init__(command_name, *args)
        if command_name.lower() in _SENSITIVE_COMMANDS:
            self.__cmd = {}
        else:
            self.__cmd = command
        self.__db = database_name

    @property
    def command(self):
        """The command document."""
        return self.__cmd

    @property
    def database_name(self):
        """The name of the database this command was run against."""
        return self.__db


class CommandSucceededEvent(_CommandEvent):
    """Event published when a command succeeds.

    :Parameters:
      - `duration`: The command duration as a datetime.timedelta.
      - `reply`: The server reply document.
      - `command_name`: The command name.
      - `request_id`: The request id for this operation.
      - `connection_id`: The address (host, port) of the server this command
        was sent to.
      - `operation_id`: An optional identifier for a series of related events.
    """
    __slots__ = ("__duration_micros", "__reply")

    def __init__(self, duration, reply, command_name,
                 request_id, connection_id, operation_id):
        super(CommandSucceededEvent, self).__init__(
            command_name, request_id, connection_id, operation_id)
        self.__duration_micros = _to_micros(duration)
        if command_name.lower() in _SENSITIVE_COMMANDS:
            self.__reply = {}
        else:
            self.__reply = reply

    @property
    def duration_micros(self):
        """The duration of this operation in microseconds."""
        return self.__duration_micros

    @property
    def reply(self):
        """The server failure document for this operation."""
        return self.__reply


class CommandFailedEvent(_CommandEvent):
    """Event published when a command fails.

    :Parameters:
      - `duration`: The command duration as a datetime.timedelta.
      - `failure`: The server reply document.
      - `command_name`: The command name.
      - `request_id`: The request id for this operation.
      - `connection_id`: The address (host, port) of the server this command
        was sent to.
      - `operation_id`: An optional identifier for a series of related events.
    """
    __slots__ = ("__duration_micros", "__failure")

    def __init__(self, duration, failure, *args):
        super(CommandFailedEvent, self).__init__(*args)
        self.__duration_micros = _to_micros(duration)
        self.__failure = failure

    @property
    def duration_micros(self):
        """The duration of this operation in microseconds."""
        return self.__duration_micros

    @property
    def failure(self):
        """The server failure document for this operation."""
        return self.__failure


class _EventListeners(object):
    """Configure event listeners for a client instance.

    Any event listeners registered globally are included by default.

    :Parameters:
      - `listeners`: A list of event listeners.
    """
    def __init__(self, listeners):
        self.__command_listeners = _LISTENERS.command_listeners[:]
        if listeners is not None:
            self.__command_listeners.extend(listeners)
        self.__enabled_for_commands = bool(self.__command_listeners)

    @property
    def enabled_for_commands(self):
        """Are any CommandListener instances registered?"""
        return self.__enabled_for_commands

    @property
    def event_listeners(self):
        """List of registered event listeners."""
        return self.__command_listeners[:]

    def publish_command_start(self, command, database_name,
                              request_id, connection_id, op_id=None):
        """Publish a CommandStartedEvent to all command listeners.

        :Parameters:
          - `command`: The command document.
          - `database_name`: The name of the database this command was run
            against.
          - `request_id`: The request id for this operation.
          - `connection_id`: The address (host, port) of the server this
            command was sent to.
          - `op_id`: The (optional) operation id for this operation.
        """
        if op_id is None:
            op_id = request_id
        event = CommandStartedEvent(
            command, database_name, request_id, connection_id, op_id)
        for subscriber in self.__command_listeners:
            try:
                subscriber.started(event)
            except Exception:
                _handle_exception()


    def publish_command_success(self, duration, reply, command_name,
                                request_id, connection_id, op_id=None):
        """Publish a CommandSucceededEvent to all command listeners.

        :Parameters:
          - `duration`: The command duration as a datetime.timedelta.
          - `reply`: The server reply document.
          - `command_name`: The command name.
          - `request_id`: The request id for this operation.
          - `connection_id`: The address (host, port) of the server this
            command was sent to.
          - `op_id`: The (optional) operation id for this operation.
        """
        if op_id is None:
            op_id = request_id
        event = CommandSucceededEvent(
            duration, reply, command_name, request_id, connection_id, op_id)
        for subscriber in self.__command_listeners:
            try:
                subscriber.succeeded(event)
            except Exception:
                _handle_exception()


    def publish_command_failure(self, duration, failure, command_name,
                                request_id, connection_id, op_id=None):
        """Publish a CommandFailedEvent to all command listeners.

        :Parameters:
          - `duration`: The command duration as a datetime.timedelta.
          - `failure`: The server reply document or failure description
            document.
          - `command_name`: The command name.
          - `request_id`: The request id for this operation.
          - `connection_id`: The address (host, port) of the server this
            command was sent to.
          - `op_id`: The (optional) operation id for this operation.
        """
        if op_id is None:
            op_id = request_id
        event = CommandFailedEvent(
            duration, failure, command_name, request_id, connection_id, op_id)
        for subscriber in self.__command_listeners:
            try:
                subscriber.failed(event)
            except Exception:
                _handle_exception()

# Copyright 2015 MongoDB, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); you # may not use this file except in compliance with the License.  You # may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or # implied.  See the License for the specific language governing # permissions and limitations under the License. Tools to monitor driver events.  Use :func:`register` to register global listeners for specific events. Currently only command events are published. Listeners must be a subclass of :class:`CommandListener` and implement :meth:`~CommandListener.started`, :meth:`~CommandListener.succeeded`, and :meth:`~CommandListener.failed`.  For example, a simple command logger might be implemented like this::      import logging      from pymongo import monitoring      class CommandLogger(monitoring.CommandListener):          def started(self, event):             logging.info("Command {0.command_name} with request id "                          "{0.request_id} started on server "                          "{0.connection_id}".format(event))          def succeeded(self, event):             logging.info("Command {0.command_name} with request id "                          "{0.request_id} on server {0.connection_id} "                          "succeeded in {0.duration_micros} "                          "microseconds".format(event))          def failed(self, event):             logging.info("Command {0.command_name} with request id "                          "{0.request_id} on server {0.connection_id} "                          "failed in {0.duration_micros} "                          "microseconds".format(event))      monitoring.register(CommandLogger())  Event listeners can also be registered per instance of :class:`~pymongo.mongo_client.MongoClient`::      client = MongoClient(event_listeners=[CommandLogger()])  Note that previously registered global listeners are automatically included when configuring per client event listeners. Registering a new global listener will not add that listener to existing client instances.  .. note:: Events are delivered **synchronously**. Application threads block   waiting for event handlers (e.g. :meth:`~CommandListener.started`) to   return. Care must be taken to ensure that your event handlers are efficient   enough to not adversely affect overall application performance.  .. warning:: The command documents published through this API are *not* copies.   If you intend to modify them in any way you must copy them in your event   handler first. Abstract base class for command listeners. Abstract method to handle CommandStartedEvent.          :Parameters:           - `event`: An instance of :class:`CommandStartedEvent` Abstract method to handle CommandSucceededEvent.          :Parameters:           - `event`: An instance of :class:`CommandSucceededEvent` Abstract method to handle CommandFailedEvent.          :Parameters:           - `event`: An instance of :class:`CommandFailedEvent` Convert duration 'dur' to microseconds. # Python 2.6 Validate event listeners Register a global event listener.      :Parameters:       - `listener`: A subclass of :class:`CommandListener`. Print exceptions raised by subscribers to stderr. # Heavily influenced by logging.Handler.handleError. # See note here: # https://docs.python.org/3.4/library/sys.html#sys.__stderr__ # Note - to avoid bugs from forgetting which if these is all lowercase and # which are camelCase, and at the same time avoid having to add a test for # every command, use all lowercase here and test against command_name.lower(). Base class for command events. The command name. The request id for this operation. The address (host, port) of the server this command was sent to. An id for this series of events or None. Event published when a command starts.      :Parameters:       - `command`: The command document.       - `database_name`: The name of the database this command was run against.       - `request_id`: The request id for this operation.       - `connection_id`: The address (host, port) of the server this command         was sent to.       - `operation_id`: An optional identifier for a series of related events. # Command name must be first key. The command document. The name of the database this command was run against. Event published when a command succeeds.      :Parameters:       - `duration`: The command duration as a datetime.timedelta.       - `reply`: The server reply document.       - `command_name`: The command name.       - `request_id`: The request id for this operation.       - `connection_id`: The address (host, port) of the server this command         was sent to.       - `operation_id`: An optional identifier for a series of related events. The duration of this operation in microseconds. The server failure document for this operation. Event published when a command fails.      :Parameters:       - `duration`: The command duration as a datetime.timedelta.       - `failure`: The server reply document.       - `command_name`: The command name.       - `request_id`: The request id for this operation.       - `connection_id`: The address (host, port) of the server this command         was sent to.       - `operation_id`: An optional identifier for a series of related events. The duration of this operation in microseconds. The server failure document for this operation. Configure event listeners for a client instance.      Any event listeners registered globally are included by default.      :Parameters:       - `listeners`: A list of event listeners. Are any CommandListener instances registered? List of registered event listeners. Publish a CommandStartedEvent to all command listeners.          :Parameters:           - `command`: The command document.           - `database_name`: The name of the database this command was run             against.           - `request_id`: The request id for this operation.           - `connection_id`: The address (host, port) of the server this             command was sent to.           - `op_id`: The (optional) operation id for this operation. Publish a CommandSucceededEvent to all command listeners.          :Parameters:           - `duration`: The command duration as a datetime.timedelta.           - `reply`: The server reply document.           - `command_name`: The command name.           - `request_id`: The request id for this operation.           - `connection_id`: The address (host, port) of the server this             command was sent to.           - `op_id`: The (optional) operation id for this operation. Publish a CommandFailedEvent to all command listeners.          :Parameters:           - `duration`: The command duration as a datetime.timedelta.           - `failure`: The server reply document or failure description             document.           - `command_name`: The command name.           - `request_id`: The request id for this operation.           - `connection_id`: The address (host, port) of the server this             command was sent to.           - `op_id`: The (optional) operation id for this operation.