Allow multiple MySQL instances (DataDog#267)

* Allowing Multiple MySQL instances

* Tweaking tags and Dealing with undef sock declarations

* Trying to fix Travis Failures involving the sock declaration

* [puppet] address issue with undefined sock parameter.

manifests/integrations/mysql.pp

@@ -34,12 +34,30 @@
 #    password => 'some_pass',
 #    user     => 'datadog'
 #  }
+# Sample Usage (Instance):
+#  class { 'datadog_agent::integrations::mysql' :
+#    instances => [{
+#      host                      => 'localhost',
+#      password                  => 'mypassword',
+#      user                      => 'datadog',
+#      port                      => '3306',
+#      tags                      => ['instance:mysql1'],
+#      replication               => '0',
+#      galera_cluster            => '0',
+#      extra_status_metrics      => 'true',
+#      extra_innodb_metrics      => 'true',
+#      extra_performance_metrics => 'true',
+#      schema_size_metrics       => 'true', 
+#      disable_innodb_metrics    => 'false',
+#    }
+#  }
 #
 #
 class datadog_agent::integrations::mysql(
   $password,
   $host = 'localhost',
   $user = 'datadog',
+  $port = 3306,
   $sock = undef,
   $tags = [],
   $replication = '0',
@@ -49,11 +67,34 @@
   $extra_performance_metrics = false,
   $schema_size_metrics = false,
   $disable_innodb_metrics = false,
+  $instances = undef,
   ) inherits datadog_agent::params {
   include datadog_agent
 
   validate_array($tags)
 
+  if !$instances and $host {
+    $_instances = [{
+      'host'                      => $host,
+      'password'                  => $password,
+      'user'                      => $user,
+      'port'                      => $port,
+      'sock'                      => $sock,
+      'tags'                      => $tags,
+      'replication'               => $replication,
+      'galera_cluster'            => $galera_cluster,
+      'extra_status_metrics'      => $extra_status_metrics,
+      'extra_innodb_metrics'      => $extra_innodb_metrics,
+      'extra_performance_metrics' => $extra_performance_metrics,
+      'schema_size_metrics'       => $schema_size_metrics,
+      'disable_innodb_metrics'    => $disable_innodb_metrics,
+    }]
+  } elsif !$instances{
+    $_instances = []
+  } else {
+    $_instances = $instances
+  }
+
   file { "${datadog_agent::params::conf_dir}/mysql.yaml":
     ensure  => file,
     owner   => $datadog_agent::params::dd_user,

templates/agent-conf.d/mysql.yaml.erb

@@ -5,26 +5,34 @@
 init_config:
 
 instances:
-  - server: <%= @host %>
-    user: <%= @user %>
-    pass: <%= @password %>
-<% if @sock -%>
-    sock: <%= @sock %>
+<%- (Array(@_instances)).each do |instance| -%>
+  - server: <%= instance['host'] %>
+    user: <%= instance['user'] %>
+    pass: <%= instance['password'] %>
+<% if instance['port'] -%>
+    port: <%= instance['port'] %>
 <% end -%>
-#    port: 3306             # Optional
-#    defaults_file: my.cnf  # Alternate configuration mechanism
-<% if [email protected]? -%>
-    tags:                  # Optional
-<% @tags.each do |tag| -%>
-        - <%= tag %>
+<% if instance['sock'] and instance['sock'] != :undef -%>
+    sock: <%= instance['sock'] %>
 <% end -%>
+
+<% if instance['tags'] and ! instance['tags'].empty? -%>
+    tags:
+  <%- Array(instance['tags']).each do |tag| -%>
+    <%- if tag != '' -%>
+      - <%= tag %>
+    <%- end -%>
+  <%- end -%>
 <% end -%>
+
     options:               # Optional
-        replication: <%= @replication %>
-        galera_cluster: <%= @galera_cluster %>
-        extra_status_metrics: <%= @extra_status_metrics %>
-        extra_innodb_metrics: <%= @extra_innodb_metrics %>
-        extra_performance_metrics: <%= @extra_performance_metrics %>
-        schema_size_metrics: <%= @schema_size_metrics %>
-        disable_innodb_metrics: <%= @disable_innodb_metrics %>
+        replication: <%= instance['replication'] %>
+        galera_cluster: <%= instance['galera_cluster'] %>
+        extra_status_metrics: <%= instance['extra_status_metrics'] %>
+        extra_innodb_metrics: <%= instance['extra_innodb_metrics'] %>
+        extra_performance_metrics: <%= instance['extra_performance_metrics'] %>
+        schema_size_metrics: <%= instance['schema_size_metrics'] %>
+        disable_innodb_metrics: <%= instance['disable_innodb_metrics'] %>
+
+<% end -%>