use mlua::{chunk, ExternalResult, Lua, LuaSerdeExt, Result}; #[tokio::main] async fn main() -> Result<()> { let lua = Lua::new(); let null = lua.null(); let fetch_json = lua.create_async_function(|lua, uri: String| async move { let resp = reqwest::get(&uri) .await .and_then(|resp| resp.error_for_status()) .into_lua_err()?; let json = resp.json::().await.into_lua_err()?; lua.to_value(&json) })?; let f = lua .load(chunk! { function print_r(t, indent) local indent = indent or "" for k, v in pairs(t) do io.write(indent, tostring(k)) if type(v) == "table" then io.write(":\n") print_r(v, indent.." ") else io.write(": ", v == $null and "null" or tostring(v), "\n") end end end local res = $fetch_json(...) print_r(res) }) .into_function()?; f.call_async("https://httpbin.org/anything?arg0=val0").await }