feat(npm): implement Node API (#13633)

This PR implements the NAPI for loading native modules into Deno. 

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
Co-authored-by: DjDeveloper <43033058+DjDeveloperr@users.noreply.github.com>
Co-authored-by: Ryan Dahl <ry@tinyclouds.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/cli/napi/async.rs b/cli/napi/async.rs
new file mode 100644
index 000000000..b84d22272
--- /dev/null
+++ b/cli/napi/async.rs
@@ -0,0 +1,78 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use deno_runtime::deno_napi::*;
+
+#[repr(C)]
+pub struct AsyncWork {
+  pub data: *mut c_void,
+  pub execute: napi_async_execute_callback,
+  pub complete: napi_async_complete_callback,
+}
+
+#[napi_sym::napi_sym]
+fn napi_create_async_work(
+  _env: *mut Env,
+  _async_resource: napi_value,
+  _async_resource_name: napi_value,
+  execute: napi_async_execute_callback,
+  complete: napi_async_complete_callback,
+  data: *mut c_void,
+  result: *mut napi_async_work,
+) -> Result {
+  let mut work = AsyncWork {
+    data,
+    execute,
+    complete,
+  };
+  *result = transmute::<Box<AsyncWork>, _>(Box::new(work));
+  Ok(())
+}
+
+#[napi_sym::napi_sym]
+fn napi_cancel_async_work(
+  _env: &mut Env,
+  _async_work: napi_async_work,
+) -> Result {
+  Ok(())
+}
+
+/// Frees a previously allocated work object.
+#[napi_sym::napi_sym]
+fn napi_delete_async_work(_env: &mut Env, work: napi_async_work) -> Result {
+  let work = Box::from_raw(work);
+  drop(work);
+
+  Ok(())
+}
+
+#[napi_sym::napi_sym]
+fn napi_queue_async_work(env_ptr: *mut Env, work: napi_async_work) -> Result {
+  let work: &AsyncWork = &*(work as *const AsyncWork);
+  let env: &mut Env = env_ptr.as_mut().ok_or(Error::InvalidArg)?;
+
+  let fut = Box::new(move || {
+    (work.execute)(env_ptr as napi_env, work.data);
+    // Note: Must be called from the loop thread.
+    (work.complete)(env_ptr as napi_env, napi_ok, work.data);
+  });
+  env.add_async_work(fut);
+
+  Ok(())
+}
+
+// TODO: Custom async operations.
+
+#[napi_sym::napi_sym]
+fn napi_async_init(
+  _env: *mut Env,
+  _async_resource: napi_value,
+  _async_resource_name: napi_value,
+  _result: *mut *mut (),
+) -> Result {
+  todo!()
+}
+
+#[napi_sym::napi_sym]
+fn napi_async_destroy(_env: *mut Env, _async_context: *mut ()) -> Result {
+  todo!()
+}