Lua binding: New API: `set_log_threshold` and `log`

Signed-off-by: Jianhui Zhao <jianhuizhao329@gmail.com>

example/lua/helloworld.lua

@@ -22,18 +22,24 @@
 local uloop = require "uloop"
 local uh = require "uhttpd"
 
+local verbose = true
 local port = 8914
 
+-- LOG_DEBUG LOG_INFO LOG_ERR
+if not verbose then
+    uh.set_log_threshold(uh.LOG_ERR)
+end
+
 uloop.init()
 
-print("uhttpd version:", uh.VERSION)
+uh.log(uh.LOG_INFO, "uhttpd version:" .. uh.VERSION)
 
 local srv = uh.new(port)
 
 -- srv:set_options({docroot = "/home/zjh/www", index = "lua.html"})
 -- srv:ssl_init("uhttpd.crt", "uhttpd.key")
 
-print("Listen on:", port)
+uh.log(uh.LOG_INFO, "Listen on:" .. port)
 
 srv:set_error404_cb(function(cl, opt)
     uh.send_header(cl, 200, "OK", -1)

src/lua/uhttpd-lua.c

@@ -19,6 +19,7 @@
 
 #include <string.h>
 
+#include "log.h"
 #include "uhttpd.h"
 #include "uhttpd-lua.h"
 
@@ -336,6 +337,25 @@ static int lua_uh_request_done(lua_State *L)
     return 0;
 }
 
+static int lua_uh_log(lua_State *L)
+{
+    int priority = lua_tointeger(L, 1);
+    const char *msg = lua_tostring(L, 2);
+
+    luaL_where(L, 1);
+
+    ulog(priority, "%s%s\n", lua_tostring(L, -1), msg);
+
+    return 0;
+}
+
+static int lua_uh_set_log_threshold(lua_State *L)
+{
+    ulog_threshold(lua_tointeger(L, 1));
+
+    return 0;
+}
+
 static const luaL_Reg uhttpd_fun[] = {
     {"new", lua_uh_new},
     {"send_header", lua_uh_send_header},
@@ -346,6 +366,8 @@ static const luaL_Reg uhttpd_fun[] = {
     {"send_error", lua_uh_send_error},
     {"redirect", lua_uh_redirect},
     {"request_done", lua_uh_request_done},
+    {"log", lua_uh_log},
+    {"set_log_threshold", lua_uh_set_log_threshold},
     {NULL, NULL}
 };
 
@@ -370,5 +392,14 @@ int luaopen_uhttpd(lua_State *L)
 #endif
     lua_setfield(L, -2, "SSL_SUPPORTED");
 
+    lua_pushinteger(L, LOG_DEBUG);
+    lua_setfield(L, -2, "LOG_DEBUG");
+
+    lua_pushinteger(L, LOG_INFO);
+    lua_setfield(L, -2, "LOG_INFO");
+
+    lua_pushinteger(L, LOG_ERR);
+    lua_setfield(L, -2, "LOG_ERR");
+
     return 1;
 }