optimize: now ngx.log is much faster when the log level argument is l…

…ower than the actual error_log level specified in nginx.conf. thanks Matthieu Tourne for providing the patch.

src/ngx_http_lua_log.c

@@ -10,8 +10,9 @@ static int ngx_http_lua_print(lua_State *L);
 static int ngx_http_lua_ngx_log(lua_State *L);
 
 
-static int log_wrapper(ngx_http_request_t *r, const char *ident, int level,
- lua_State *L);
+static int log_wrapper(ngx_http_request_t *r, const char *ident,
+ ngx_uint_t level, lua_State *L);
+
 static void ngx_http_lua_inject_log_consts(lua_State *L);
 
 
@@ -37,7 +38,7 @@ ngx_http_lua_ngx_log(lua_State *L)
  /* remove log-level param from stack */
  lua_remove(L, 1);
 
- return log_wrapper(r, "", level, L);
+ return log_wrapper(r, "", (ngx_uint_t) level, L);
  }
 
  dd("(lua-log) can't output log due to invalid logging context!");
@@ -75,7 +76,8 @@ ngx_http_lua_print(lua_State *L)
 
 
 static int
-log_wrapper(ngx_http_request_t *r, const char *ident, int level, lua_State *L)
+log_wrapper(ngx_http_request_t *r, const char *ident, ngx_uint_t level,
+ lua_State *L)
 {
  u_char *buf;
  u_char *p;
@@ -85,6 +87,10 @@ log_wrapper(ngx_http_request_t *r, const char *ident, int level, lua_State *L)
  int type;
  const char *msg;
 
+ if (level > r->connection->log->log_level) {
+ return 0;
+ }
+
  nargs = lua_gettop(L);
  if (nargs == 0) {
  buf = NULL;
@@ -185,7 +191,7 @@ log_wrapper(ngx_http_request_t *r, const char *ident, int level, lua_State *L)
  *p++ = '\0';
 
 done:
- ngx_log_error((ngx_uint_t) level, r->connection->log, 0,
+ ngx_log_error(level, r->connection->log, 0,
  "%s%s", ident, (buf == NULL) ? (u_char *) "(null)" : buf);
  return 0;
 }