X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/e089e61019a4d59eacb6340f0c58dc7bf3b61fd3..afd0f06b755ff53ce91d1dabeca959655590d3f0:/src/scripting.c

diff --git a/src/scripting.c b/src/scripting.c
index d1e85e26..1503c3c9 100644
--- a/src/scripting.c
+++ b/src/scripting.c
@@ -187,6 +187,7 @@ int luaRedisGenericCommand(lua_State *lua, int raise_error) {
     }
 
     if (cmd->flags & REDIS_CMD_RANDOM) server.lua_random_dirty = 1;
+    if (cmd->flags & REDIS_CMD_WRITE) server.lua_write_dirty = 1;
 
     /* Run the command */
     cmd->proc(c);
@@ -273,11 +274,24 @@ int luaLogCommand(lua_State *lua) {
 void luaMaskCountHook(lua_State *lua, lua_Debug *ar) {
     long long elapsed;
     REDIS_NOTUSED(ar);
+    REDIS_NOTUSED(lua);
 
     elapsed = (ustime()/1000) - server.lua_time_start;
-    if (elapsed >= server.lua_time_limit) {
-        redisLog(REDIS_NOTICE,"Lua script aborted for max execution time after %lld milliseconds of running time.",elapsed);
-        lua_pushstring(lua,"Script aborted for max execution time.");
+    if (elapsed >= server.lua_time_limit && server.lua_timedout == 0) {
+        redisLog(REDIS_WARNING,"Lua slow script detected: still in execution after %lld milliseconds. You can try killing the script using the SCRIPT KILL command.",elapsed);
+        server.lua_timedout = 1;
+        /* Once the script timeouts we reenter the event loop to permit others
+         * to call SCRIPT KILL or SHUTDOWN NOSAVE if needed. For this reason
+         * we need to mask the client executing the script from the event loop.
+         * If we don't do that the client may disconnect and could no longer be
+         * here when the EVAL command will return. */
+         aeDeleteFileEvent(server.el, server.lua_caller->fd, AE_READABLE);
+    }
+    if (server.lua_timedout)
+        aeProcessEvents(server.el, AE_FILE_EVENTS|AE_DONT_WAIT);
+    if (server.lua_kill) {
+        redisLog(REDIS_WARNING,"Lua script killed by user with SCRIPT KILL.");
+        lua_pushstring(lua,"Script killed by user with SCRIPT KILL...");
         lua_error(lua);
     }
 }
@@ -551,6 +565,7 @@ void evalGenericCommand(redisClient *c, int evalsha) {
      * Thanks to this flag we'll raise an error every time a write command
      * is called after a random command was used. */
     server.lua_random_dirty = 0;
+    server.lua_write_dirty = 0;
 
     /* Get the number of arguments that are keys */
     if (getLongLongFromObjectOrReply(c,c->argv[2],&numkeys,NULL) != REDIS_OK)
@@ -606,9 +621,8 @@ void evalGenericCommand(redisClient *c, int evalsha) {
      * is running for too much time.
      * We set the hook only if the time limit is enabled as the hook will
      * make the Lua script execution slower. */
-    if (server.lua_time_limit > 0 && server.masterhost != NULL) {
+    if (server.lua_time_limit > 0 && server.masterhost == NULL) {
         lua_sethook(lua,luaMaskCountHook,LUA_MASKCOUNT,100000);
-        server.lua_time_start = ustime()/1000;
     } else {
         lua_sethook(lua,luaMaskCountHook,0,0);
     }
@@ -616,7 +630,18 @@ void evalGenericCommand(redisClient *c, int evalsha) {
     /* At this point whatever this script was never seen before or if it was
      * already defined, we can call it. We have zero arguments and expect
      * a single return value. */
+    server.lua_caller = c;
+    server.lua_time_start = ustime()/1000;
+    server.lua_kill = 0;
     if (lua_pcall(lua,0,1,0)) {
+        if (server.lua_timedout) {
+            server.lua_timedout = 0;
+            /* Restore the readable handler that was unregistered when the
+             * script timeout was detected. */
+            aeCreateFileEvent(server.el,c->fd,AE_READABLE,
+                              readQueryFromClient,c);
+        }
+        server.lua_caller = NULL;
         selectDb(c,server.lua_client->db->id); /* set DB ID from Lua client */
         addReplyErrorFormat(c,"Error running script (call to %s): %s\n",
             funcname, lua_tostring(lua,-1));
@@ -624,6 +649,8 @@ void evalGenericCommand(redisClient *c, int evalsha) {
         lua_gc(lua,LUA_GCCOLLECT,0);
         return;
     }
+    server.lua_timedout = 0;
+    server.lua_caller = NULL;
     selectDb(c,server.lua_client->db->id); /* set DB ID from Lua client */
     luaReplyToRedisReply(c,lua);
     lua_gc(lua,LUA_GCSTEP,1);
@@ -739,6 +766,15 @@ void scriptCommand(redisClient *c) {
         }
         addReplyBulkCBuffer(c,funcname+2,40);
         sdsfree(sha);
+    } else if (c->argc == 2 && !strcasecmp(c->argv[1]->ptr,"kill")) {
+        if (server.lua_caller == NULL) {
+            addReplyError(c,"No scripts in execution right now.");
+        } else if (server.lua_write_dirty) {
+            addReplyError(c, "Sorry the script already executed write commands against the dataset. You can either wait the script termination or kill the server in an hard way using the SHUTDOWN NOSAVE command.");
+        } else {
+            server.lua_kill = 1;
+            addReply(c,shared.ok);
+        }
     } else {
         addReplyError(c, "Unknown SCRIPT subcommand or wrong # of args.");
     }