dm: Add configurable 'activation' decision makersandbox/pszewczyk/master

This module allows to bind events to specific actions by using a
configuration file.

Change-Id: I4d406f739df4788d03d9ba99bf247e69409564a3
Signed-off-by: Paweł Szewczyk <p.szewczyk@samsung.com>

3 files changed, 181 insertions, 3 deletions

diff --git a/Makefile.am b/Makefile.am
index 95a249e..d6b7829 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -131,7 +131,8 @@ EXTRA_faultd_SOURCES = \
     src/action/system_reboot.c \
     src/action/system_reboot_to_recovery.c \
     src/action/service_recover.c \
-    src/action/unit_start.c
+    src/action/unit_start.c \
+    src/decision_makers/activation_dm.c
 
 faultd_CFLAGS = $(AM_CFLAGS)
 faultd_LDFLAGS = -ldl
@@ -149,7 +150,8 @@ modules_LTLIBRARIES = audit_listener.la \
 		  system_reboot_action.la \
 		  system_reboot_to_recovery_action.la \
 		  service_recover_action.la \
-		  unit_start_action.la
+		  unit_start_action.la \
+		  activation_eh.la
 
 audit_listener_la_SOURCES = src/listeners/audit.c
 audit_listener_la_LIBADD = $(AUDIT_LIBS)
@@ -170,6 +172,7 @@ system_reboot_action_la_SOURCES = src/action/system_reboot.c
 system_reboot_to_recovery_action_la_SOURCES = src/action/system_reboot_to_recovery.c
 service_recover_action_la_SOURCES = src/action/service_recover.c
 unit_start_action_la_SOURCES = src/action/unit_start.c
+activation_eh_la_SOURCES = src/decision_makers/activation_dm.c
 
 if USE_EJDB
 EXTRA_faultd_SOURCES += src/database/ejdb.c
diff --git a/packaging/faultd.spec b/packaging/faultd.spec
index d1d78cd..462acca 100644
--- a/packaging/faultd.spec
+++ b/packaging/faultd.spec
@@ -86,7 +86,8 @@ for mod in audit_listener \
 	standard_reboot_eh \
 	startup_listener \
 	system_reboot_to_recovery_action \
-	unit_start_action
+	unit_start_action \
+	activation_eh
 do
 	ln -s %{moduledir}/${mod}.so %{buildroot}/%{moduleconfdir}/${mod}.so;
 	ln -s ../available-modules/${mod}.so %{buildroot}/%{enabled_moduledir}/${mod}.so;
diff --git a/src/decision_makers/activation_dm.c b/src/decision_makers/activation_dm.c
new file mode 100644
index 0000000..5b508da
--- /dev/null
+++ b/src/decision_makers/activation_dm.c
@@ -0,0 +1,174 @@
+/*
+ * This file is part of faultd.
+ *
+ * Copyright © 2017 Samsung Electronics
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <malloc.h>
+#include <errno.h>
+
+#include "decision_made_event.h"
+#include "action.h"
+#include "event_processor.h"
+#include "log.h"
+#include "service.h"
+#include "common.h"
+#include "database.h"
+#include "json-config.h"
+
+#define MODULE_NAME "activation_decision_maker"
+
+struct activation_decision_maker {
+	struct faultd_event_handler eh;
+	struct list_head rules;
+};
+
+struct rule {
+	char *ev_name;
+	char *action_name;
+	struct fault_object *action_data;
+
+	struct list_head node;
+};
+
+static int activation_event_match(struct faultd_event_handler *handler,
+		struct faultd_event *ev)
+{
+	struct activation_decision_maker *dm = container_of(handler,
+			struct activation_decision_maker, eh);
+	struct rule *r;
+
+	/* TODO separate list for existing types to avoid looping for every event */
+	list_for_each_entry(r, &dm->rules, node) {
+		if (strcmp(r->ev_name, ev->type->name) == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
+static int activation_make_decision(struct faultd_event_handler *handler)
+{
+	struct faultd_event *ev = pop_faultd_event(&handler->event_queue);
+	struct activation_decision_maker *dm = container_of(handler,
+			struct activation_decision_maker, eh);
+	int ret;
+	struct rule *r;
+	struct faultd_event *new_ev;
+	struct dm_event_data ev_data = {
+		.reason = ev,
+		.who_made = MODULE_NAME,
+	};
+
+	list_for_each_entry(r, &dm->rules, node) {
+		if (strcmp(r->ev_name, ev->type->name))
+			continue;
+
+		ev_data.action_data = r->action_data; /* action data is already initalized */
+		ret = faultd_event_create(DECISION_MADE_EVENT_ID, &ev_data, &new_ev);
+		if (ret) {
+			log_error("Unable to create event");
+			goto out;
+		}
+
+		ret = event_processor_report_event(new_ev);
+		faultd_event_unref(new_ev);
+		if (ret) {
+			log_error("Unable to report event");
+			goto out;
+		}
+	}
+
+	return 0;
+
+out:
+	return ret;
+}
+
+static int add_rule(struct activation_decision_maker *dm, json_object *root)
+{
+	int ret;
+	struct rule *r;
+	char *str;
+
+	r = malloc(sizeof(*r));
+
+	ret = get_config_field(root, "event", &str, json_type_string);
+	if (ret < 0)
+		goto out;
+
+	r->ev_name = str;
+
+	ret = get_config_field(root, "action", &str, json_type_string);
+	if (ret < 0)
+		goto out;
+
+	r->action_name = str;
+
+	/*
+	ret = get_config_field(root, "data", &obj, json_type_obj);
+	if (ret < 0)
+		goto out;
+		TODO get data
+		*/
+
+	list_add_tail(&r->node, &dm->rules);
+
+out:
+	free(r);
+	return ret;
+}
+
+static int activation_init(struct faultd_event_handler *handler, struct faultd_config *config)
+{
+	struct activation_decision_maker *dm = container_of(handler,
+			struct activation_decision_maker, eh);
+	int ret;
+	int len;
+	int i;
+	json_object *array, *obj;
+
+	INIT_LIST_HEAD(&dm->rules);
+
+	if (config == NULL)
+		return 0;
+
+	ret = get_config_field(config->root, "rules",
+			&array,
+			json_type_array);
+	if (ret < 0)
+		return ret;
+
+	len = json_object_array_length(array);
+	for (i = 0; i < len; ++i) {
+		obj = json_object_array_get_idx(array, i);
+		add_rule(dm, obj);
+	}
+
+	return ret;
+};
+
+static struct activation_decision_maker activation_dm = {
+	.eh = {
+		.name = MODULE_NAME,
+		.init = activation_init,
+		.event_match = activation_event_match,
+		.handle_event = activation_make_decision,
+
+		.node = LIST_HEAD_INIT(activation_dm.eh.node),
+	},
+};
+
+FAULTD_EVENT_HANDLER_REGISTER(activation_dm.eh, activation_eh,
+		FAULTD_MODULE_TYPE_DECISION_MAKER)