X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/070e39454dbe8bcd164e04f7f83da047bd367e22..f7ccc4830bfd9345452027020c12c100d01090ef:/src/scripting.c

diff --git a/src/scripting.c b/src/scripting.c
index 725c123e..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);
     }
 }
@@ -488,6 +502,51 @@ void luaSetGlobalArray(lua_State *lua, char *var, robj **elev, int elec) {
     lua_setglobal(lua,var);
 }
 
+/* Define a lua function with the specified function name and body.
+ * The function name musts be a 2 characters long string, since all the
+ * functions we defined in the Lua context are in the form:
+ *
+ *   f_<hex sha1 sum>
+ *
+ * On success REDIS_OK is returned, and nothing is left on the Lua stack.
+ * On error REDIS_ERR is returned and an appropriate error is set in the
+ * client context. */
+int luaCreateFunction(redisClient *c, lua_State *lua, char *funcname, robj *body) {
+    sds funcdef = sdsempty();
+
+    funcdef = sdscat(funcdef,"function ");
+    funcdef = sdscatlen(funcdef,funcname,42);
+    funcdef = sdscatlen(funcdef," ()\n",4);
+    funcdef = sdscatlen(funcdef,body->ptr,sdslen(body->ptr));
+    funcdef = sdscatlen(funcdef,"\nend\n",5);
+
+    if (luaL_loadbuffer(lua,funcdef,sdslen(funcdef),"func definition")) {
+        addReplyErrorFormat(c,"Error compiling script (new function): %s\n",
+            lua_tostring(lua,-1));
+        lua_pop(lua,1);
+        sdsfree(funcdef);
+        return REDIS_ERR;
+    }
+    sdsfree(funcdef);
+    if (lua_pcall(lua,0,0,0)) {
+        addReplyErrorFormat(c,"Error running script (new function): %s\n",
+            lua_tostring(lua,-1));
+        lua_pop(lua,1);
+        return REDIS_ERR;
+    }
+
+    /* We also save a SHA1 -> Original script map in a dictionary
+     * so that we can replicate / write in the AOF all the
+     * EVALSHA commands as EVAL using the original script. */
+    {
+        int retval = dictAdd(server.lua_scripts,
+                             sdsnewlen(funcname+2,40),body);
+        redisAssertWithInfo(c,NULL,retval == DICT_OK);
+        incrRefCount(body);
+    }
+    return REDIS_OK;
+}
+
 void evalGenericCommand(redisClient *c, int evalsha) {
     lua_State *lua = server.lua;
     char funcname[43];
@@ -506,6 +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)
@@ -532,53 +592,21 @@ void evalGenericCommand(redisClient *c, int evalsha) {
         funcname[42] = '\0';
     }
 
+    /* Try to lookup the Lua function */
     lua_getglobal(lua, funcname);
     if (lua_isnil(lua,1)) {
-        sds funcdef;
-      
+        lua_pop(lua,1); /* remove the nil from the stack */
         /* Function not defined... let's define it if we have the
          * body of the funciton. If this is an EVALSHA call we can just
          * return an error. */
         if (evalsha) {
             addReply(c, shared.noscripterr);
-            lua_pop(lua,1); /* remove the nil from the stack */
-            return;
-        }
-        funcdef = sdsempty();
-
-        lua_pop(lua,1); /* remove the nil from the stack */
-        funcdef = sdscat(funcdef,"function ");
-        funcdef = sdscatlen(funcdef,funcname,42);
-        funcdef = sdscatlen(funcdef," ()\n",4);
-        funcdef = sdscatlen(funcdef,c->argv[1]->ptr,sdslen(c->argv[1]->ptr));
-        funcdef = sdscatlen(funcdef,"\nend\n",5);
-        /* printf("Defining:\n%s\n",funcdef); */
-
-        if (luaL_loadbuffer(lua,funcdef,sdslen(funcdef),"func definition")) {
-            addReplyErrorFormat(c,"Error compiling script (new function): %s\n",
-                lua_tostring(lua,-1));
-            lua_pop(lua,1);
-            sdsfree(funcdef);
-            return;
-        }
-        sdsfree(funcdef);
-        if (lua_pcall(lua,0,0,0)) {
-            addReplyErrorFormat(c,"Error running script (new function): %s\n",
-                lua_tostring(lua,-1));
-            lua_pop(lua,1);
             return;
         }
+        if (luaCreateFunction(c,lua,funcname,c->argv[1]) == REDIS_ERR) return;
+        /* Now the following is guaranteed to return non nil */
         lua_getglobal(lua, funcname);
-
-        /* We also save a SHA1 -> Original script map in a dictionary
-         * so that we can replicate / write in the AOF all the
-         * EVALSHA commands as EVAL using the original script. */
-        {
-            int retval = dictAdd(server.lua_scripts,
-                                 sdsnewlen(funcname+2,40),c->argv[1]);
-            redisAssertWithInfo(c,NULL,retval == DICT_OK);
-            incrRefCount(c->argv[1]);
-        }
+        redisAssert(!lua_isnil(lua,1));
     }
 
     /* Populate the argv and keys table accordingly to the arguments that
@@ -593,9 +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) {
+    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);
     }
@@ -603,7 +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));
@@ -611,6 +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);
@@ -709,6 +749,32 @@ void scriptCommand(redisClient *c) {
             else
                 addReply(c,shared.czero);
         }
+    } else if (c->argc == 3 && !strcasecmp(c->argv[1]->ptr,"load")) {
+        char funcname[43];
+        sds sha;
+
+        funcname[0] = 'f';
+        funcname[1] = '_';
+        hashScript(funcname+2,c->argv[2]->ptr,sdslen(c->argv[2]->ptr));
+        sha = sdsnewlen(funcname+2,40);
+        if (dictFind(server.lua_scripts,sha) == NULL) {
+            if (luaCreateFunction(c,server.lua,funcname,c->argv[2])
+                    == REDIS_ERR) {
+                sdsfree(sha);
+                return;
+            }
+        }
+        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.");
     }