On 28/11/2022 22:07, Evan Hunt wrote:
On Mon, Nov 28, 2022 at 12:53:16PM +0000, Marcus Kool wrote:
In a test setup there are two instances of the same plugin and everything
works as expected (plugin_register is called twice - once for each view).
However, "rndc reconfig" calls plugin_register again twice but does not call
plugin_destroy...
Are you sure it's not being run?
It is run, but...
I see random behavior while I do the same test: start named with unmodified config file with 2 views (each a plugin instance), run the same 40+ queries and reconfigure. repeat: a few more queries and
reconfigure
9.16.1 rarely sees plugin_destroy at first reconfigure, 40% at the second reconfigure for the first time, 60% at the third reconfigure for the first time. Thereafter, after each plugin_register there
is a plugin_destroy.
9.18.9 never seen plugin_destroy at first reconfigure, may take up to 4
reconfigures for plugin_destroy being called. Thereafter, after each
plugin_register there is a plugin_destroy.
So, does anyone know when plugin_destroy is called and perhaps how a plugin
can detect a reconfig is done and can deallocate resources for the plugins
registered at startup?
For each view, "rndc reconfig" is supposed to create and configure a new view,
move the zones from the old view to the new one, and then destroy the one.
The destroy function for the view should clean up plugins:
| if (view->plugins != NULL && view->plugins_free != NULL) {
| view->plugins_free(view->mctx, &view->plugins);
| }
view->plugins_free is a pointer to ns_plugins_free(), which calls
unload_plugin() for each plugin configured in the view, and that calls
the plugin_destroy() function defined in the module.
If you have the logging level set to debug(1), you should see "unloading
plugin" in your log file when this happens.
Yes, the "unloading plugin" matches the log messages of the plugin.
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