Implement connections counters

src/controller.c

 
 struct rspamd_controller_session {
 	struct rspamd_controller_worker_ctx *ctx;
+	struct rspamd_worker *wrk;
 	rspamd_mempool_t *pool;
 	struct rspamd_task *task;
 	struct rspamd_classifier_config *cl;
 		rspamd_mempool_delete (session->pool);
 	}
 
+	session->wrk->nconns --;
 	rspamd_inet_address_destroy (session->from_addr);
 	msg_debug_session ("destroy session %p", session);
 	g_slice_free1 (sizeof (struct rspamd_controller_session), session);
 	session->ctx = ctx;
 
 	session->from_addr = addr;
+	session->wrk = worker;
+	worker->nconns ++;
 
 	rspamd_http_router_handle_socket (ctx->http, nfd, session);
 }

src/fuzzy_storage.c

 
 	/* Got some data */
 	if (what == EV_READ) {
+		worker->nconns++;
+
 		while ((r = rspamd_inet_address_recvfrom (fd, buf, sizeof (buf), 0,
 			&session.addr)) == -1) {
 			if (errno == EINTR) {
 		}
 
 		rspamd_inet_address_destroy (session.addr);
+		worker->nconns --;
 	}
 
 	rspamd_explicit_memzero (session.nm, sizeof (session.nm));

src/worker.c

 	gboolean allow_learn;
 	/* DNS resolver */
 	struct rspamd_dns_resolver *resolver;
-	/* Current tasks */
-	guint32 tasks;
 	/* Limit of tasks */
 	guint32 max_tasks;
 	/* Events base */
 static void
 reduce_tasks_count (gpointer arg)
 {
-	guint32 *tasks = arg;
+	guint *nconns = arg;
 
-	(*tasks)--;
+	(*nconns)--;
 }
 
 static gint
 
 	ctx = worker->ctx;
 
-	if (ctx->max_tasks != 0 && ctx->tasks > ctx->max_tasks) {
+	if (ctx->max_tasks != 0 && worker->nconns > ctx->max_tasks) {
 		msg_info_ctx ("current tasks is now: %uD while maximum is: %uD",
-			ctx->tasks,
+				worker->nconns,
 			ctx->max_tasks);
 		return;
 	}
 		RSPAMD_HTTP_SERVER,
 		ctx->keys_cache);
 	task->ev_base = ctx->ev_base;
-	ctx->tasks++;
+	worker->nconns++;
 	rspamd_mempool_add_destructor (task->task_pool,
-		(rspamd_mempool_destruct_t)reduce_tasks_count, &ctx->tasks);
+		(rspamd_mempool_destruct_t)reduce_tasks_count, &worker->nconns);
 
 	/* Set up async session */
 	task->s = rspamd_session_create (task->task_pool, rspamd_task_fin,