collectd-perl(5): Document the <Plugin> configuration block.

Signed-off-by: Sebastian Harl <sh@tokkee.org>
Signed-off-by: Florian Forster <octo@huhu.verplant.org>

diff --git a/src/collectd-perl.pod b/src/collectd-perl.pod
index 7cd5d72..c3fcb10 100644 (file)
--- a/src/collectd-perl.pod
+++ b/src/collectd-perl.pod
@@ -11,6 +11,10 @@ collectd-perl - Documentation of collectd's C<perl plugin>
     BaseName "Collectd::Plugin"
     EnableDebugger ""
     LoadPlugin "FooBar"
+
+    <Plugin FooBar>
+      Foo "Bar"
+    </Plugin>
   </Plugin>
 
 =head1 DESCRIPTION
@@ -36,6 +40,16 @@ causes the Perl-interpreter to be initialized.
 Prepends I<Name>B<::> to all plugin names loaded after this option. This is
 provided for convenience to keep plugin names short.
 
+=item E<lt>B<Plugin> I<Name>E<gt> block
+
+This block may be used to pass on configuration settings to a Perl plugin. The
+configuration is converted into a config-item data type which is passed to the
+registered configuration callback. See below for details about the config-item
+data type and how to register callbacks.
+
+The I<name> identifies the callback. It is used literally and independent of
+the B<BaseName> setting.
+
 =item B<EnableDebugger> I<Package>[=I<option>,...]
 
 Run collectd under the control of the Perl source debugger. If I<Package> is
@@ -71,6 +85,13 @@ example. The following types of B<callback functions> are known to collectd
 
 =over 4
 
+=item configuration functions
+
+This type of functions is called during configuration if an appropriate
+B<Plugin> block has been encountered. It is called once for each B<Plugin>
+block which matches the name of the callback as provided with the
+B<plugin_register> method - see below.
+
 =item init functions
 
 This type of functions is called once after loading the module and before any
@@ -140,6 +161,19 @@ and collectd:
 
 =over 4
 
+=item Config-Item
+
+A config-item is one structure which keeps the informations provided in the
+configuration file. The array of children keeps one entry for each
+configuration option. Each such entry is another config-item structure, which
+may nest further if nested blocks are used.
+
+  {
+    key      => key,
+    values   => [ val1, val2, ... ],
+    children => [ { ... }, { ... }, ... ]
+  }
+
 =item Data-Set
 
 A data-set is a list of one or more data-sources. Each data-source defines a
@@ -204,6 +238,8 @@ I<type> can be one of:
 
 =over 4
 
+=item TYPE_CONFIG
+
 =item TYPE_INIT
 
 =item TYPE_READ
@@ -248,6 +284,11 @@ arguments:
 
 =over 4
 
+=item TYPE_CONFIG
+
+The only argument passed is I<config-item>. See above for the layout of this
+data type.
+
 =item TYPE_INIT
 
 =item TYPE_READ
@@ -396,6 +437,8 @@ available (B<:all> will export all of them):
 
 =over 4
 
+=item B<TYPE_CONFIG>
+
 =item B<TYPE_INIT>
 
 =item B<TYPE_READ>
@@ -408,6 +451,8 @@ available (B<:all> will export all of them):
 
 =item B<TYPE_LOG>
 
+=item B<TYPE_DATASET>
+
 =back
 
 =item B<:ds_types>