# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
+=encoding UTF-8
+
=head1 NAME
collectd-python - Documentation of collectd's C<python plugin>
=head1 SYNOPSIS
- <LoadPlugin python>
- Globals true
- </LoadPlugin>
+ LoadPlugin python
# ...
<Plugin python>
ModulePath "/path/to/your/python/modules"
=item B<LoadPlugin> I<Plugin>
-Loads the Python plugin I<Plugin>. Unlike most other LoadPlugin lines, this one
-should be a block containing the line "Globals true". This will cause collectd
-to export the name of all objects in the Python interpreter for all plugins to
-see. If you don't do this or your platform does not support it, the embedded
-interpreter will start anyway but you won't be able to load certain Python
-modules, e.g. "time".
+Loads the Python plugin I<Plugin>.
=item B<Encoding> I<Name>
The default encoding for Unicode objects you pass to collectd. If you omit this
-option it will default to B<ascii> on I<Python 2> and B<utf-8> on I<Python 3>.
-This is hardcoded in Python and will ignore everything else, including your
-locale.
+option it will default to B<ascii> on I<Python 2>. On I<Python 3> it will
+always be B<utf-8>, as this function was removed, so this will be silently
+ignored.
+These defaults are hardcoded in Python and will ignore everything else,
+including your locale.
=item B<ModulePath> I<Name>
-Appends I<Name> to B<sys.path>. You won't be able to import any scripts you
+Prepends I<Name> to B<sys.path>. You won't be able to import any scripts you
wrote unless they are located in one of the directories in this list. Please
note that it only has effect on plugins loaded after this option. You can
use multiple B<ModulePath> lines to add more than one directory.
=item configuration functions
-This type of functions is called during configuration if an appropriate
+These are called during configuration if an appropriate
B<Module> block has been encountered. It is called once for each B<Module>
block which matches the name of the callback as provided with the
B<register_config> method - see below.
=item init functions
-This type of functions is called once after loading the module and before any
+These are called once after loading the module and before any
calls to the read and write functions. It should be used to initialize the
internal state of the plugin (e.E<nbsp>g. open sockets, ...). This is the
earliest point where you may use threads.
=item read functions
-This type of function is used to collect the actual data. It is called once
+These are used to collect the actual data. It is called once
per interval (see the B<Interval> configuration option of collectd). Usually
it will call B<plugin_dispatch_values> to dispatch the values to collectd
which will pass them on to all registered B<write functions>. If this function
=item write functions
-This type of function is used to write the dispatched values. It is called
+These are used to write the dispatched values. It is called
once for every value that was dispatched by any plugin.
=item flush functions
-This type of function is used to flush internal caches of plugins. It is
+These are used to flush internal caches of plugins. It is
usually triggered by the user only. Any plugin which caches data before
writing it to disk should provide this kind of callback function.
=item log functions
-This type of function is used to pass messages of plugins or the daemon itself
+These are used to pass messages of plugins or the daemon itself
to the user.
=item notification function
-This type of function is used to act upon notifications. In general, a
+These are used to act upon notifications. In general, a
notification is a status message that may be associated with a data instance.
Usually, a notification is generated by the daemon if a configured threshold
has been exceeded (see the section "THRESHOLD CONFIGURATION" in
I<name> is an optional identifier for this callback. The default name is
B<python>.I<module>. I<module> is taken from the B<__module__> attribute of
your callback function. Every callback needs a unique identifier, so if you
-want to register the same callback multiple time in the same module you need to
-specify a name here. Otherwise it's save to ignore this parameter I<identifier>
-is the full identifier assigned to this callback.
+want to register the same callback multiple times in the same module you need to
+specify a name here. Otherwise it's safe to ignore this parameter.
+
+=item
+
+I<identifier> is the full identifier assigned to this callback.
=back
The callback will be called without arguments.
-=item register_read(callback[, interval][, data][, name]) -> identifier
+=item register_read(callback[, interval][, data][, name]) -> I<identifier>
This function takes an additional parameter: I<interval>. It specifies the
time between calls to the callback function.
or a callback function. The identifier will be constructed in the same way as
for the register functions.
-=item B<flush>(I<plugin[, I<timeout>][, I<identifier>]) -> None
+=item B<get_dataset>(I<name>) -> I<definition>
+
+Returns the definition of a dataset specified by I<name>. I<definition> is a list
+of tuples, each representing one data source. Each tuple has 4 values:
+
+=over 4
+
+=item name
+
+A string, the name of the data source.
+
+=item type
+
+A string that is equal to either of the variables B<DS_TYPE_COUNTER>,
+B<DS_TYPE_GAUGE>, B<DS_TYPE_DERIVE> or B<DS_TYPE_ABSOLUTE>.
+
+=item min
+
+A float or None, the minimum value.
+
+=item max
+
+A float or None, the maximum value.
+
+=back
+
+=item B<flush>(I<plugin>[, I<timeout>][, I<identifier>]) -> None
Flush one or all plugins. I<timeout> and the specified I<identifiers> are
passed on to the registered flush-callbacks. If omitted, the timeout defaults
=item
Please feel free to send in new plugins to collectd's mailing list at
-E<lt>collectdE<nbsp>atE<nbsp>verplant.orgE<gt> for review and, possibly,
+E<lt>collectdE<nbsp>atE<nbsp>collectd.orgE<gt> for review and, possibly,
inclusion in the main distribution. In the latter case, we will take care of
keeping the plugin up to date and adapting it to new versions of collectd.
This manpage has been written by Sven Trenkel
E<lt>collectdE<nbsp>atE<nbsp>semidefinite.deE<gt>.
It is based on the L<collectd-perl(5)> manual page by
-Florian Forster E<lt>octoE<nbsp>atE<nbsp>verplant.orgE<gt> and
+Florian Forster E<lt>octoE<nbsp>atE<nbsp>collectd.orgE<gt> and
Sebastian Harl E<lt>shE<nbsp>atE<nbsp>tokkee.orgE<gt>.
=cut
projects / collectd.git / blobdiff