Fixed: Naemon stops executing checks and doesnt respawn Core Worker

processes (naemon#418)

src/naemon/workers.c

@@ -64,6 +64,9 @@ static struct wproc_list *to_remove = NULL;
 unsigned int wproc_num_workers_online = 0, wproc_num_workers_desired = 0;
 unsigned int wproc_num_workers_spawned = 0;
 
+static int get_desired_workers(int desired_workers);
+static int spawn_core_worker(void);
+
 #define tv2float(tv) ((float)((tv)->tv_sec) + ((float)(tv)->tv_usec) / 1000000.0)
 
 static void wproc_logdump_buffer(int debuglevel, int verbosity, const char *prefix, char *buf)
@@ -414,6 +417,7 @@ static int handle_worker_result(int sd, int events, void *arg)
 	char *buf, *error_reason = NULL;
 	size_t size;
 	int ret;
+    unsigned int desired_workers;
 	struct wproc_worker *wp = (struct wproc_worker *)arg;
 
 	ret = nm_bufferqueue_read(wp->bq, wp->sd);
@@ -428,17 +432,32 @@ static int handle_worker_result(int sd, int events, void *arg)
 		nm_log(NSLOG_INFO_MESSAGE, "wproc: Socket to worker %s broken, removing", wp->name);
 		wproc_num_workers_online--;
 		iobroker_unregister(nagios_iobs, sd);
-		if (workers.len <= 0) {
-			/* there aren't global workers left, we can't run any more checks
-			 * we should try respawning a few of the standard ones
-			 */
-			nm_log(NSLOG_RUNTIME_ERROR, "wproc: All our workers are dead, we can't do anything!");
-		}
 
 		/* remove worker from worker list - this ensures that we don't reassign
 		 * its jobs back to itself*/
 		remove_worker(wp);
 
+        desired_workers = get_desired_workers(num_check_workers);
+
+		if (workers.len < desired_workers) {
+			/* there aren't global workers left, we can't run any more checks
+			 * we should try respawning a few of the standard ones
+			 */
+			nm_log(NSLOG_RUNTIME_ERROR, "wproc: We have have less Core Workers than we should have, trying to respawn Core Worker");
+
+            /* Respawn a worker */
+	        if ((ret = spawn_core_worker()) < 0) {
+		        nm_log(NSLOG_RUNTIME_ERROR, "wproc: Failed to respawn Core Worker");
+            } else {
+		        nm_log(NSLOG_INFO_MESSAGE, "wproc: Respawning Core Worker %u was successful", ret);
+            }
+		} else if (workers.len == 0) {
+			/* there aren't global workers left, we can't run any more checks
+			 * we should try respawning a few of the standard ones
+			 */
+			nm_log(NSLOG_RUNTIME_ERROR, "wproc: All our workers are dead, we can't do anything!");
+        }
+
 		/* reassign this dead worker's jobs */
 		g_hash_table_iter_init(&iter, wp->jobs);
 		while (g_hash_table_iter_next(&iter, NULL, &job_)) {
@@ -664,24 +683,8 @@ static int spawn_core_worker(void)
 }
 
 
-int init_workers(int desired_workers)
+static int get_desired_workers(int desired_workers)
 {
-	int i;
-
-	/*
-	 * we register our query handler before launching workers,
-	 * so other workers can join us whenever they're ready
-	 */
-	specialized_workers = g_hash_table_new_full(g_str_hash, g_str_equal,
-	                      free, NULL
-	                                           );
-	if (!qh_register_handler("wproc", "Worker process management and info", 0, wproc_query_handler)) {
-		log_debug_info(DEBUGL_IPC, DEBUGV_BASIC, "wproc: Successfully registered manager as @wproc with query handler\n");
-	} else {
-		nm_log(NSLOG_RUNTIME_ERROR, "wproc: Failed to register manager with query handler\n");
-		return -1;
-	}
-
 	if (desired_workers <= 0) {
 		int cpus = online_cpus();
 
@@ -708,6 +711,31 @@ int init_workers(int desired_workers)
 	if (desired_workers < (int)workers.len)
 		return -1;
 
+    return desired_workers;
+}
+
+
+int init_workers(int desired_workers)
+{
+	int i;
+
+	/*
+	 * we register our query handler before launching workers,
+	 * so other workers can join us whenever they're ready
+	 */
+	specialized_workers = g_hash_table_new_full(g_str_hash, g_str_equal,
+	                      free, NULL
+	                                           );
+	if (!qh_register_handler("wproc", "Worker process management and info", 0, wproc_query_handler)) {
+		log_debug_info(DEBUGL_IPC, DEBUGV_BASIC, "wproc: Successfully registered manager as @wproc with query handler\n");
+	} else {
+		nm_log(NSLOG_RUNTIME_ERROR, "wproc: Failed to register manager with query handler\n");
+		return -1;
+	}
+
+    /* Get the number of workers we need */
+    desired_workers = get_desired_workers(desired_workers);
+
 	for (i = 0; i < desired_workers; i++)
 		spawn_core_worker();