Keepup libchdb.so/chdb.h with main repo

.gitignore

@@ -1,4 +1,6 @@
 node_modules
 build
 /metadata
-/user_defined
+/user_defined
+.vscode/
+libchdb.so

binding.gyp

@@ -1,13 +1,34 @@
 {
+  "variables": {
+    "openssl_fips": "",
+  },
   "targets": [
+    {
+      "target_name": "action_before_build",
+      "type": "none",
+      "hard_dependency": 1,
+      "actions": [
+        {
+          "action_name": "update_libchdb",
+          "inputs": [],
+          "outputs": [
+            "<(module_root_dir)/libchdb.so"
+          ],
+          "action": ["./update_libchdb.sh"]
+        }
+      ]
+    },
     {
       "target_name": "addon",
       "sources": [ "src/addon.cc" ],
+      "dependencies": [
+        "action_before_build"
+      ],
       "include_dirs": [
-        "<!(node -p \"require('node-addon-api').include\")",
+        "<!@(node -p \"require('node-addon-api').include\")",
         "include/"
       ],
-      "libraries": [ "-L/usr/src/chdb-node-addon/lib", "-lchdb" ],
+      "libraries": [ "-L<(module_root_dir)", "-lchdb" ],
       "cflags!": [ "-fno-exceptions" ],
       "cflags_cc!": [ "-fno-exceptions" ],
       "defines": [ "NAPI_DISABLE_CPP_EXCEPTIONS" ]

include/chdb.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#ifdef __cplusplus
+#    include <cstddef>
+#    include <cstdint>
+extern "C" {
+#else
+#    include <stddef.h>
+#    include <stdint.h>
+#endif
+
+#define CHDB_EXPORT __attribute__((visibility("default")))
+struct CHDB_EXPORT local_result
+{
+    char * buf;
+    size_t len;
+    void * _vec; // std::vector<char> *, for freeing
+    double elapsed;
+    uint64_t rows_read;
+    uint64_t bytes_read;
+};
+
+CHDB_EXPORT struct local_result * query_stable(int argc, char ** argv);
+CHDB_EXPORT void free_result(struct local_result * result);
+
+#ifdef __cplusplus
+}
+#endif