From: Marek Vavruša <marek.vavrusa@nic.cz>
Date: Sat, 1 Aug 2015 16:06:32 +0000 (+0200)
Subject: daemon/engine: priority prefix ‘<‘ for modules
X-Git-Tag: v1.0.0-beta1~62^2~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3714f4bc4966e250bcb9d31b881b40531fa580d2;p=thirdparty%2Fknot-resolver.git

daemon/engine: priority prefix ‘<‘ for modules

if the configured modules name is prefixed with ‘<‘ it takes precedence before all others,
e.g. modules = { ‘hints’, ‘<block’ }
means that the ‘hints’ module will be executed in-order (last), and ‘block’ module layer will be called as first in query processing
---

diff --git a/daemon/engine.c b/daemon/engine.c
index e91aef6eb..db0c5c39e 100644
--- a/daemon/engine.c
+++ b/daemon/engine.c
@@ -434,7 +434,12 @@ int engine_register(struct engine *engine, const char *name)
 	if (engine == NULL || name == NULL) {
 		return kr_error(EINVAL);
 	}
-
+	/* Check priority modules */
+	bool is_priority = false;
+	if (name[0] == '<') {
+		is_priority = true;
+		name += 1;
+	}
 	/* Make sure module is unloaded */
 	(void) engine_unregister(engine, name);
 	/* Attempt to load binary module */
@@ -452,11 +457,16 @@ int engine_register(struct engine *engine, const char *name)
 		free(module);
 		return ret;
 	}
-
 	if (array_push(engine->modules, module) < 0) {
 		engine_unload(engine, module);
 		return kr_error(ENOMEM);
 	}
+	/* Push to front if priority module */
+	if (is_priority) {
+		struct kr_module **arr = engine->modules.at;
+		memmove(&arr[1], &arr[0], sizeof(*arr) * (engine->modules.len - 1));
+		arr[0] = module;
+	}
 
 	/* Register properties */
 	if (module->props) {