Add discovery mode/rule for AWS Lambda (#3742)

Co-authored-by: itoussies <[email protected]>

cloud/aws/lambda/mode/discovery.pm

@@ -0,0 +1,103 @@
+#
+# Copyright 2022 Centreon (http://www.centreon.com/)
+#
+# Centreon is a full-fledged industry-strength solution that meets
+# the needs in IT infrastructure and application monitoring for
+# service performance.
+#
+# 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.
+#
+
+package cloud::aws::lambda::mode::discovery;
+
+use base qw(centreon::plugins::mode);
+
+use strict;
+use warnings;
+use JSON::XS;
+
+sub new {
+    my ($class, %options) = @_;
+    my $self = $class->SUPER::new(package => __PACKAGE__, %options);
+    bless $self, $class;
+
+    $options{options}->add_options(arguments => {
+        "prettify"  => { name => 'prettify' },
+    });
+
+    return $self;
+}
+
+sub check_options {
+    my ($self, %options) = @_;
+    $self->SUPER::init(%options);
+}
+
+sub run {
+    my ($self, %options) = @_;
+
+    my @disco_data;
+    my $disco_stats;
+
+    $disco_stats->{start_time} = time();
+
+    my $functions = $options{custom}->discovery(
+        service => 'lambda',
+        command => 'list-functions'
+    );
+
+    foreach my $function (@{$functions->{Functions}}) {
+        my %function;
+        $function{name} = $function->{FunctionName};
+        push @disco_data, \%function;
+    }
+
+    $disco_stats->{end_time} = time();
+    $disco_stats->{duration} = $disco_stats->{end_time} - $disco_stats->{start_time};
+    $disco_stats->{discovered_items} = @disco_data;
+    $disco_stats->{results} = \@disco_data;
+
+    my $encoded_data;
+    eval {
+        if (defined($self->{option_results}->{prettify})) {
+            $encoded_data = JSON::XS->new->utf8->pretty->encode($disco_stats);
+        } else {
+            $encoded_data = JSON::XS->new->utf8->encode($disco_stats);
+        }
+    };
+    if ($@) {
+        $encoded_data = '{"code":"encode_error","message":"Cannot encode discovered data into JSON format"}';
+    }
+
+    $self->{output}->output_add(short_msg => $encoded_data);
+    $self->{output}->display(nolabel => 1, force_ignore_perfdata => 1);
+    $self->{output}->exit();
+}
+
+1;
+
+__END__
+
+=head1 MODE
+
+AWS SNS discovery.
+
+=over 8
+
+=item B<--prettify>
+
+Prettify JSON output.
+
+=back
+
+=cut

cloud/aws/lambda/plugin.pm

@@ -31,7 +31,8 @@ sub new {
 
     $self->{version} = '0.1';
     %{ $self->{modes} } = (
-        'invocations'               => 'cloud::aws::lambda::mode::invocations',
+        'discovery'   => 'cloud::aws::lambda::mode::discovery',
+        'invocations' => 'cloud::aws::lambda::mode::invocations'
     );
 
     $self->{custom_modes}{paws} = 'cloud::aws::custom::paws';