feature: Export three functions for manipulating ngx_http_lua_co_ctx_t structures.

Author: zhuizhuhaomeng

src/api/ngx_http_lua_api.h

@@ -20,6 +20,7 @@
 
 
 #define ngx_http_lua_version  10028
+#define NGX_HTTP_LUA_EXPORT_CO_CTX_CLEANUP 1
 
 
 typedef struct ngx_http_lua_co_ctx_s  ngx_http_lua_co_ctx_t;
@@ -66,6 +67,13 @@ void ngx_http_lua_set_cur_co_ctx(ngx_http_request_t *r,
 
 lua_State *ngx_http_lua_get_co_ctx_vm(ngx_http_lua_co_ctx_t *coctx);
 
+
+void *ngx_http_lua_get_co_ctx_data(ngx_http_lua_co_ctx_t *coctx);
+void ngx_http_lua_set_co_ctx_cleanup(ngx_http_lua_co_ctx_t *coctx,
+    ngx_http_cleanup_pt cleanup, void *data);
+void ngx_http_lua_cleanup_co_ctx_pending_operation(
+    ngx_http_lua_co_ctx_t *coctx);
+
 void ngx_http_lua_co_ctx_resume_helper(ngx_http_lua_co_ctx_t *coctx, int nrets);
 
 int ngx_http_lua_get_lua_http10_buffering(ngx_http_request_t *r);

src/ngx_http_lua_api.c

@@ -221,7 +221,7 @@ ngx_http_lua_get_cur_co_ctx(ngx_http_request_t *r)
 
     ctx = ngx_http_get_module_ctx(r, ngx_http_lua_module);
 
-    return ctx->cur_co_ctx;
+    return ctx == NULL ? NULL : ctx->cur_co_ctx;
 }
 
 
@@ -245,6 +245,29 @@ ngx_http_lua_get_co_ctx_vm(ngx_http_lua_co_ctx_t *coctx)
 }
 
 
+void *
+ngx_http_lua_get_co_ctx_data(ngx_http_lua_co_ctx_t *coctx)
+{
+    return coctx ? coctx->data : NULL;
+}
+
+
+void
+ngx_http_lua_set_co_ctx_cleanup(ngx_http_lua_co_ctx_t *coctx,
+    ngx_http_cleanup_pt cleanup, void *data)
+{
+    coctx->cleanup = cleanup;
+    coctx->data = data;
+}
+
+
+void
+ngx_http_lua_cleanup_co_ctx_pending_operation(ngx_http_lua_co_ctx_t *coctx)
+{
+    ngx_http_lua_cleanup_pending_operation(coctx);
+}
+
+
 static ngx_int_t
 ngx_http_lua_co_ctx_resume(ngx_http_request_t *r)
 {