From 288f811feacdd6b26c2263e7b9fcfabaa051a1ec Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 16 May 2011 18:32:03 +0200
Subject: [PATCH] All commands exported by Redis to Lua scripts are now inside
 the redis table. Implemented redis.log() function.

---
 src/redis.h     |  1 +
 src/scripting.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/src/redis.h b/src/redis.h
index c2551eb8a..923d6f75d 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -963,6 +963,7 @@ struct redisCommand *lookupCommandByCString(char *s);
 void call(redisClient *c, struct redisCommand *cmd);
 int prepareForShutdown();
 void redisLog(int level, const char *fmt, ...);
+void redisLogRaw(int level, const char *msg);
 void usage();
 void updateDictResizePolicy(void);
 int htNeedsResize(dict *dict);
diff --git a/src/scripting.c b/src/scripting.c
index 0b6eb616c..2f94f4d7e 100644
--- a/src/scripting.c
+++ b/src/scripting.c
@@ -200,6 +200,41 @@ int luaRedisCommand(lua_State *lua) {
     return 1;
 }
 
+int luaLogCommand(lua_State *lua) {
+    int j, argc = lua_gettop(lua);
+    int level;
+    sds log;
+
+    if (argc < 2) {
+        luaPushError(lua, "redis.log() requires two arguments or more.");
+        return 1;
+    } else if (!lua_isnumber(lua,-argc)) {
+        luaPushError(lua, "First argument must be a number.");
+        return 1;
+    }
+    level = lua_tonumber(lua,-argc);
+    if (level < REDIS_DEBUG && level > REDIS_WARNING) {
+        luaPushError(lua, "Invalid debug level.");
+        return 1;
+    }
+
+    /* Glue together all the arguments */
+    log = sdsempty();
+    for (j = 1; j < argc; j++) {
+        size_t len;
+        char *s;
+
+        s = (char*)lua_tolstring(lua,(-argc)+j,&len);
+        if (s) {
+            if (j != 1) log = sdscatlen(log," ",1);
+            log = sdscatlen(log,s,len);
+        }
+    }
+    redisLogRaw(level,log);
+    sdsfree(log);
+    return 0;
+}
+
 void luaMaskCountHook(lua_State *lua, lua_Debug *ar) {
     long long elapsed;
     REDIS_NOTUSED(ar);
@@ -216,8 +251,36 @@ void scriptingInit(void) {
     lua_State *lua = lua_open();
     luaL_openlibs(lua);
 
-    /* Register the 'r' command */
+    /* Register the redis commands table and fields */
+    lua_newtable(lua);
+
+    /* redis.call */
+    lua_pushstring(lua,"call");
     lua_pushcfunction(lua,luaRedisCommand);
+    lua_settable(lua,-3);
+
+    /* redis.log and log levels. */
+    lua_pushstring(lua,"log");
+    lua_pushcfunction(lua,luaLogCommand);
+    lua_settable(lua,-3);
+
+    lua_pushstring(lua,"LOG_DEBUG");
+    lua_pushnumber(lua,REDIS_DEBUG);
+    lua_settable(lua,-3);
+
+    lua_pushstring(lua,"LOG_VERBOSE");
+    lua_pushnumber(lua,REDIS_VERBOSE);
+    lua_settable(lua,-3);
+
+    lua_pushstring(lua,"LOG_NOTICE");
+    lua_pushnumber(lua,REDIS_NOTICE);
+    lua_settable(lua,-3);
+
+    lua_pushstring(lua,"LOG_WARNING");
+    lua_pushnumber(lua,REDIS_WARNING);
+    lua_settable(lua,-3);
+
+    /* Finally set the table as 'redis' global var. */
     lua_setglobal(lua,"redis");
 
     /* Create the (non connected) client that we use to execute Redis commands
-- 
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