Implement IndexedDB document auto-save (#422)

* removed all use of document indicies

* -add u64 support for wasm bridge

* fixed rust formating

* Cleaned up FrontendDocumentState in js-messages

* Tiny tweaks from code review

* - moved more of closeDocumentWithConfirmation to rust
- updated serde_wasm_bindgen to add feature flag

* working initial auto save impl

* auto save is a lifetime file

* - cargo fmt
- fixc error message
- move document version constant

* code review round 1

* generate seed for uuid in js when wasm is initialized

* Resolve PR feedback

* Further address PR feedback

* Fix failing test

Co-authored-by: Keavon Chambers <keavon@keavon.com>
Co-authored-by: otdavies <oliver@psyfer.io>

editor/src/communication/dispatcher.rs

@@ -96,7 +96,7 @@ impl Dispatcher {
 
 #[cfg(test)]
 mod test {
-	use crate::{document::DocumentMessageHandler, message_prelude::*, misc::test_utils::EditorTestUtils, Editor};
+	use crate::{communication::set_uuid_seed, document::DocumentMessageHandler, message_prelude::*, misc::test_utils::EditorTestUtils, Editor};
 	use graphene::{color::Color, Operation};
 
 	fn init_logger() {
@@ -108,6 +108,7 @@ mod test {
 	/// 2. A blue shape
 	/// 3. A green ellipse
 	fn create_editor_with_three_layers() -> Editor {
+		set_uuid_seed(0);
 		let mut editor = Editor::new();
 
 		editor.select_primary_color(Color::RED);

editor/src/communication/mod.rs

@@ -9,7 +9,7 @@ use rand_chacha::{
 use spin::Mutex;
 
 pub use crate::input::InputPreprocessor;
-use std::collections::VecDeque;
+use std::{cell::Cell, collections::VecDeque};
 
 pub type ActionList = Vec<Vec<MessageDiscriminant>>;
 
@@ -29,10 +29,21 @@ where
 	fn actions(&self) -> ActionList;
 }
 
+thread_local! {
+	pub static UUID_SEED: Cell<Option<u64>> = Cell::new(None);
+}
+
+pub fn set_uuid_seed(random_seed: u64) {
+	UUID_SEED.with(|seed| seed.set(Some(random_seed)))
+}
+
 pub fn generate_uuid() -> u64 {
 	let mut lock = RNG.lock();
 	if lock.is_none() {
-		*lock = Some(ChaCha20Rng::seed_from_u64(0));
+		UUID_SEED.with(|seed| {
+			let random_seed = seed.get().expect("random seed not set before editor was initialized");
+			*lock = Some(ChaCha20Rng::seed_from_u64(random_seed));
+		})
 	}
 	lock.as_mut().map(ChaCha20Rng::next_u64).unwrap()
 }