feature: added the Lua global __ngx_cycle which is a lightuserdata holding the current ngx_cycle_t pointer.

Author: agentzh

src/ngx_http_lua_util.c

@@ -81,7 +81,7 @@ ngx_uint_t  ngx_http_lua_content_length_hash = 0;
 static ngx_int_t ngx_http_lua_send_http10_headers(ngx_http_request_t *r,
     ngx_http_lua_ctx_t *ctx);
 static void ngx_http_lua_init_registry(lua_State *L, ngx_log_t *log);
-static void ngx_http_lua_init_globals(lua_State *L,
+static void ngx_http_lua_init_globals(lua_State *L, ngx_cycle_t *cycle,
     ngx_http_lua_main_conf_t *lmcf, ngx_log_t *log);
 static void ngx_http_lua_set_path(ngx_cycle_t *cycle, lua_State *L, int tab_idx,
     const char *fieldname, const char *path, const char *default_path,
@@ -294,7 +294,7 @@ ngx_http_lua_new_state(lua_State *parent_vm, ngx_cycle_t *cycle,
     lua_pop(L, 1); /* remove the "package" table */
 
     ngx_http_lua_init_registry(L, log);
-    ngx_http_lua_init_globals(L, lmcf, log);
+    ngx_http_lua_init_globals(L, cycle, lmcf, log);
 
     return L;
 }
@@ -683,12 +683,15 @@ ngx_http_lua_init_registry(lua_State *L, ngx_log_t *log)
 
 
 static void
-ngx_http_lua_init_globals(lua_State *L, ngx_http_lua_main_conf_t *lmcf,
-    ngx_log_t *log)
+ngx_http_lua_init_globals(lua_State *L, ngx_cycle_t *cycle,
+    ngx_http_lua_main_conf_t *lmcf, ngx_log_t *log)
 {
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0,
                    "lua initializing lua globals");
 
+    lua_pushlightuserdata(L, cycle);
+    lua_setglobal(L, "__ngx_cycle");
+
 #if defined(NDK) && NDK
     ngx_http_lua_inject_ndk_api(L);
 #endif /* defined(NDK) && NDK */

t/130-internal-api.t

@@ -0,0 +1,50 @@
+# vim:set ft= ts=4 sw=4 et fdm=marker:
+use lib 'lib';
+use Test::Nginx::Socket::Lua;
+
+#worker_connections(1014);
+#master_process_enabled(1);
+#log_level('warn');
+
+repeat_each(2);
+
+plan tests => repeat_each() * 3;
+
+#no_diff();
+no_long_string();
+#master_on();
+#workers(2);
+
+run_tests();
+
+__DATA__
+
+=== TEST 1: __ngx_req and __ngx_cycle
+--- http_config
+    init_by_lua '
+        my_cycle = __ngx_cycle
+    ';
+
+--- config
+    location = /t {
+        content_by_lua '
+            local ffi = require "ffi"
+            local function tonum(ud)
+                return tonumber(ffi.cast("uintptr_t", ud))
+            end
+            ngx.say(string.format("init: cycle=%#x", tonum(my_cycle)))
+            ngx.say(string.format("content cycle=%#x", tonum(__ngx_cycle)))
+            ngx.say(string.format("content req=%#x", tonum(__ngx_req)))
+        ';
+    }
+--- request
+GET /t
+
+--- response_body_like chop
+^init: cycle=(0x[a-f0-9]{4,})
+content cycle=\1
+content req=0x[a-f0-9]{4,}
+$
+--- no_error_log
+[error]
+