[Minor] Allow to close connection to redis without pooling

Issue: #2796

lualib/lua_redis.lua

@@ -71,6 +71,7 @@ local function redis_query_sentinel(ev_base, params, initialised)
     timeout = params.timeout,
     config = rspamd_config,
     ev_base = ev_base,
+    no_pool = true,
   })
 
   if not is_ok then

src/libserver/fuzzy_backend_redis.c

@@ -140,7 +140,8 @@ rspamd_fuzzy_redis_session_dtor (struct rspamd_fuzzy_redis_session *session,
 		ac = session->ctx;
 		session->ctx = NULL;
 		rspamd_redis_pool_release_connection (session->backend->pool,
-				ac, is_fatal);
+				ac,
+				is_fatal ? RSPAMD_REDIS_RELEASE_FATAL : RSPAMD_REDIS_RELEASE_DEFAULT);
 	}
 
 	ev_timer_stop (session->event_loop, &session->timeout);
@@ -290,7 +291,7 @@ rspamd_fuzzy_redis_timeout (EV_P_ ev_timer *w, int revents)
 
 		/* This will cause session closing */
 		rspamd_redis_pool_release_connection (session->backend->pool,
-				ac, TRUE);
+				ac, RSPAMD_REDIS_RELEASE_FATAL);
 	}
 }
 

src/libserver/redis_pool.c

@@ -395,7 +395,7 @@ rspamd_redis_pool_connect (struct rspamd_redis_pool *pool,
 
 void
 rspamd_redis_pool_release_connection (struct rspamd_redis_pool *pool,
-		struct redisAsyncContext *ctx, gboolean is_fatal)
+		struct redisAsyncContext *ctx, enum rspamd_redis_pool_release_type how)
 {
 	struct rspamd_redis_pool_connection *conn;
 
@@ -406,24 +406,38 @@ rspamd_redis_pool_release_connection (struct rspamd_redis_pool *pool,
 	if (conn != NULL) {
 		g_assert (conn->active);
 
-		if (is_fatal || ctx->err != REDIS_OK) {
+		if (ctx->err != REDIS_OK) {
 			/* We need to terminate connection forcefully */
-			msg_debug_rpool ("closed connection %p forcefully", conn->ctx);
+			msg_debug_rpool ("closed connection %p due to an error", conn->ctx);
 			REF_RELEASE (conn);
 		}
 		else {
-			/* Ensure that there are no callbacks attached to this conn */
-			if (ctx->replies.head == NULL) {
-				/* Just move it to the inactive queue */
-				g_queue_unlink (conn->elt->active, conn->entry);
-				g_queue_push_head_link (conn->elt->inactive, conn->entry);
-				conn->active = FALSE;
-				rspamd_redis_pool_schedule_timeout (conn);
-				msg_debug_rpool ("mark connection %p inactive", conn->ctx);
+			if (how == RSPAMD_REDIS_RELEASE_DEFAULT) {
+				/* Ensure that there are no callbacks attached to this conn */
+				if (ctx->replies.head == NULL) {
+					/* Just move it to the inactive queue */
+					g_queue_unlink (conn->elt->active, conn->entry);
+					g_queue_push_head_link (conn->elt->inactive, conn->entry);
+					conn->active = FALSE;
+					rspamd_redis_pool_schedule_timeout (conn);
+					msg_debug_rpool ("mark connection %p inactive", conn->ctx);
+				}
+				else {
+					msg_debug_rpool ("closed connection %p due to callbacks left",
+							conn->ctx);
+					REF_RELEASE (conn);
+				}
 			}
 			else {
-				msg_debug_rpool ("closed connection %p due to callbacks left",
-					conn->ctx);
+				if (how == RSPAMD_REDIS_RELEASE_FATAL) {
+					msg_debug_rpool ("closed connection %p due to an fatal termination",
+							conn->ctx);
+				}
+				else {
+					msg_debug_rpool ("closed connection %p due to explicit termination",
+							conn->ctx);
+				}
+
 				REF_RELEASE (conn);
 			}
 		}

src/libserver/redis_pool.h

@@ -53,13 +53,19 @@ struct redisAsyncContext* rspamd_redis_pool_connect (
 		const gchar *db, const gchar *password,
 		const char *ip, int port);
 
+enum rspamd_redis_pool_release_type {
+	RSPAMD_REDIS_RELEASE_DEFAULT = 0,
+	RSPAMD_REDIS_RELEASE_FATAL = 1,
+	RSPAMD_REDIS_RELEASE_ENFORCE
+};
+
 /**
  * Release a connection to the pool
  * @param pool
  * @param ctx
  */
 void rspamd_redis_pool_release_connection (struct rspamd_redis_pool *pool,
-		struct redisAsyncContext *ctx, gboolean is_fatal);
+		struct redisAsyncContext *ctx, enum rspamd_redis_pool_release_type how);
 
 /**
  * Stops redis pool and destroys it

src/lua/lua_redis.c

@@ -114,6 +114,7 @@ struct lua_redis_userdata {
 #define LUA_REDIS_ASYNC (1 << 0)
 #define LUA_REDIS_TEXTDATA (1 << 1)
 #define LUA_REDIS_TERMINATED (1 << 2)
+#define LUA_REDIS_NO_POOL (1 << 3)
 #define IS_ASYNC(ctx) ((ctx)->flags & LUA_REDIS_ASYNC)
 
 struct lua_redis_request_specific_userdata {
@@ -198,7 +199,17 @@ lua_redis_dtor (struct lua_redis_ctx *ctx)
 		ud->terminated = 1;
 		ac = ud->ctx;
 		ud->ctx = NULL;
-		rspamd_redis_pool_release_connection (ud->pool, ac, !is_successful);
+
+		if (!is_successful) {
+			rspamd_redis_pool_release_connection (ud->pool, ac,
+					RSPAMD_REDIS_RELEASE_FATAL);
+		}
+		else {
+			rspamd_redis_pool_release_connection (ud->pool, ac,
+					(ctx->flags & LUA_REDIS_NO_POOL) ?
+					RSPAMD_REDIS_RELEASE_ENFORCE : RSPAMD_REDIS_RELEASE_DEFAULT);
+		}
+
 	}
 
 	LL_FOREACH_SAFE (ud->specific, cur, tmp) {
@@ -456,7 +467,9 @@ lua_redis_callback (redisAsyncContext *c, gpointer r, gpointer priv)
 		ud->ctx = NULL;
 
 		if (ac) {
-			rspamd_redis_pool_release_connection (ud->pool, ac, FALSE);
+			rspamd_redis_pool_release_connection (ud->pool, ac,
+					(ctx->flags & LUA_REDIS_NO_POOL) ?
+					RSPAMD_REDIS_RELEASE_ENFORCE : RSPAMD_REDIS_RELEASE_DEFAULT);
 		}
 	}
 
@@ -596,7 +609,8 @@ lua_redis_callback_sync (redisAsyncContext *ac, gpointer r, gpointer priv)
 		 * This will call all callbacks pending so the entire context
 		 * will be destructed
 		 */
-		rspamd_redis_pool_release_connection (sp_ud->c->pool, ac, TRUE);
+		rspamd_redis_pool_release_connection (sp_ud->c->pool, ac,
+				RSPAMD_REDIS_RELEASE_FATAL);
 	}
 
 	result->result_ref = luaL_ref (L, LUA_REGISTRYINDEX);
@@ -646,7 +660,8 @@ lua_redis_timeout_sync (EV_P_ ev_timer *w, int revents)
 		 * This will call all callbacks pending so the entire context
 		 * will be destructed
 		 */
-		rspamd_redis_pool_release_connection (sp_ud->c->pool, ac, TRUE);
+		rspamd_redis_pool_release_connection (sp_ud->c->pool, ac,
+				RSPAMD_REDIS_RELEASE_FATAL);
 	}
 }
 
@@ -679,7 +694,8 @@ lua_redis_timeout (EV_P_ ev_timer *w, int revents)
 		 * This will call all callbacks pending so the entire context
 		 * will be destructed
 		 */
-		rspamd_redis_pool_release_connection (sp_ud->c->pool, ac, TRUE);
+		rspamd_redis_pool_release_connection (sp_ud->c->pool, ac,
+				RSPAMD_REDIS_RELEASE_FATAL);
 	}
 
 	REDIS_RELEASE (ctx);
@@ -904,6 +920,13 @@ rspamd_lua_redis_prepare_connection (lua_State *L, gint *pcbref, gboolean is_asy
 		}
 		lua_pop (L, 1);
 
+		lua_pushstring (L, "no_pool");
+		lua_gettable (L, -2);
+		if (!!lua_toboolean (L, -1)) {
+			flags |= LUA_REDIS_NO_POOL;
+		}
+		lua_pop (L, 1);
+
 		lua_pop (L, 1); /* table */
 
 		if (session && rspamd_session_blocked (session)) {
@@ -962,7 +985,8 @@ rspamd_lua_redis_prepare_connection (lua_State *L, gint *pcbref, gboolean is_asy
 			if (ud->ctx) {
 				msg_err_task_check ("cannot connect to redis: %s",
 						ud->ctx->errstr);
-				rspamd_redis_pool_release_connection (ud->pool, ud->ctx, TRUE);
+				rspamd_redis_pool_release_connection (ud->pool, ud->ctx,
+						RSPAMD_REDIS_RELEASE_FATAL);
 				ud->ctx = NULL;
 			}
 			else {
@@ -1065,7 +1089,8 @@ lua_redis_make_request (lua_State *L)
 		}
 		else {
 			msg_info ("call to redis failed: %s", ud->ctx->errstr);
-			rspamd_redis_pool_release_connection (ud->pool, ud->ctx, TRUE);
+			rspamd_redis_pool_release_connection (ud->pool, ud->ctx,
+					RSPAMD_REDIS_RELEASE_FATAL);
 			ud->ctx = NULL;
 			REDIS_RELEASE (ctx);
 			ret = FALSE;