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#  Copyright 2018 - present 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.

# PODNAME: MongoDB::Monitoring
# ABSTRACT: Internal event monitoring API for instrumentation


# vim: set ts=4 sts=4 sw=4 et tw=75:

__END__

=pod

=encoding UTF-8

=head1 NAME

MongoDB::Monitoring - Internal event monitoring API for instrumentation

=head1 VERSION

version v2.0.2

=head1 DESCRIPTION

The L<MongoDB::MongoClient> takes an optional C<monitoring_callback>
attribute, which can be used to monitor events that occur during the
operation of the driver.

The API is very simple: given a code reference, a hashref for each event
is passed to the code reference.  Here is a simple example that just
accumulates events in an array:

    our @events;
    my $cb = sub { push @events, $_[0] };

    MongoDB->connect( $uri, { monitoring_callback => $cb } );

=head1 EVENT TYPES

Every event is a hash reference, with a C<type> field indicating the type,
e.g. C<command_started>.  Each type is described below.

=head2 command_started

This event is sent just before a command is put one the wire.  It will be
followed by either a C<command_succeeded> or C<command_failed> event.

Fields:

=over 4

=item *

type: "command_started"

=item *

databaseName: the name of the database to which the command applies

=item *

commandName: the name of the command being executed; for legacy operations that don't use commands, the driver will convert them to appear as if they are in command form.

=item *

command: a hash reference representing the full command to be sent

=item *

requestId: the request identifier sent to the server

=item *

connectionId: address and port of the destination server

=back

=head2 command_succeeded

This event is sent just after a command reply is received, but only if the
database reply document contains a non-false C<ok> field.  NOTE: write
errors will have C<ok:1> even though they have write errors; for writes,
success indicates that the write attempt was valid, not that the write
succeeded.

Fields:

=over 4

=item *

type: "command_succeeded"

=item *

commandName: the name of the command being executed

=item *

durationSecs: the elapsed time in seconds since the C<command_started> event.

=item *

reply: a hash reference representing the full database reply

=item *

requestId: the request identifier sent to the server

=item *

connectionId: address and port of the destination server

=back

=head2 command_failed

This event is sent just after a command reply is received, but only if the
database reply document contains a false C<ok> field or if an exception
occurred during send or receive operations.

Fields:

=over 4

=item *

type: "command_failed"

=item *

commandName: the name of the command being executed

=item *

durationSecs: the elapsed time in seconds since the C<command_started> event.

=item *

failure: a string with a error message about the failure

=item *

eval_error: if an exception occurs, this contains the value of C<$@> when the exception was caught

=item *

reply: a hash reference representing the full database reply or an empty hashref if the failure is due to an exception

=item *

requestId: the request identifier sent to the server

=item *

connectionId: address and port of the destination server

=back

=head1 REDACTION

Certain commands are considered sensitive.  When any of the following
commands are seen in monitoring, the command body and database reply body
are replaced with an empty document:

=over 4

=item *

authenticate

=item *

saslStart

=item *

saslContinue

=item *

getnonce

=item *

createUser

=item *

updateUser

=item *

copydbgetnonce

=item *

copydbsaslstart

=item *

copydb

=back

=head1 AUTHORS

=over 4

=item *

David Golden <david@mongodb.com>

=item *

Rassi <rassi@mongodb.com>

=item *

Mike Friedman <friedo@friedo.com>

=item *

Kristina Chodorow <k.chodorow@gmail.com>

=item *

Florian Ragwitz <rafl@debian.org>

=back

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2018 by MongoDB, Inc.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004

=cut

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