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SCRIPT LOAD implemented, scripting eval command refactoring.

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This commit is contained in:
antirez 2011-10-25 10:25:59 +02:00
parent 070e39454d
commit a9b07ac459
1 changed files with 61 additions and 36 deletions
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97
src/scripting.c
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@ -488,6 +488,52 @@ 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();
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,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];
@ -532,10 +578,9 @@ 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;
/* 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. */
@ -544,41 +589,10 @@ void evalGenericCommand(redisClient *c, int evalsha) {
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
@ -709,6 +723,17 @@ void scriptCommand(redisClient *c) {
else
addReply(c,shared.czero);
}
} else if (c->argc == 3 && !strcasecmp(c->argv[1]->ptr,"load")) {
/* We obtain the script SHA1, then check if this function is already
* defined into the Lua state */
char funcname[43];
funcname[0] = 'f';
funcname[1] = '_';
hashScript(funcname+2,c->argv[2]->ptr,sdslen(c->argv[2]->ptr));
if (luaCreateFunction(c,server.lua,funcname,c->argv[2]) == REDIS_ERR)
return;
addReply(c,shared.ok);
} else {
addReplyError(c, "Unknown SCRIPT subcommand or wrong # of args.");
}