From cd46d7bd203b69e6d163fd19e38600d9feae6e56 Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Tue, 21 Nov 2023 16:20:01 +1100
Subject: Make lua db iterators async

---
 src/lua/lua_database.cpp | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

(limited to 'src/lua/lua_database.cpp')

diff --git a/src/lua/lua_database.cpp b/src/lua/lua_database.cpp
index 545dcd31..d8ae86f6 100644
--- a/src/lua/lua_database.cpp
+++ b/src/lua/lua_database.cpp
@@ -56,17 +56,28 @@ static const struct luaL_Reg kDatabaseFuncs[] = {{"indexes", indexes},
                                                  {NULL, NULL}};
 
 static auto db_iterate(lua_State* state) -> int {
+  luaL_checktype(state, 1, LUA_TFUNCTION);
+  int callback_ref = luaL_ref(state, LUA_REGISTRYINDEX);
+
   database::Iterator* it = *reinterpret_cast<database::Iterator**>(
       lua_touserdata(state, lua_upvalueindex(1)));
 
-  auto res = it->Next();
-  if (res) {
-    database::IndexRecord** record = reinterpret_cast<database::IndexRecord**>(
-        lua_newuserdata(state, sizeof(uintptr_t)));
-    *record = new database::IndexRecord(*res);
-    luaL_setmetatable(state, kDbRecordMetatable);
-    return 1;
-  }
+  it->Next([=](std::optional<database::IndexRecord> res) {
+    events::Ui().RunOnTask([=]() {
+      lua_rawgeti(state, LUA_REGISTRYINDEX, callback_ref);
+      if (res) {
+        database::IndexRecord** record =
+            reinterpret_cast<database::IndexRecord**>(
+                lua_newuserdata(state, sizeof(uintptr_t)));
+        *record = new database::IndexRecord(*res);
+        luaL_setmetatable(state, kDbRecordMetatable);
+      } else {
+        lua_pushnil(state);
+      }
+      lua_call(state, 1, 0);
+      luaL_unref(state, LUA_REGISTRYINDEX, callback_ref);
+    });
+  });
   return 0;
 }
 
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