Remove the "expected" next ID

It's an unnecessary extra layer better handled locally.

coordinator/src/main.rs

@@ -870,6 +870,7 @@ pub async fn handle_processors<D: Db, Pro: Processors, P: P2p>(
     // Alternatively, a peek method with local delineation of handled messages would work.
 
     let msg = processors.recv().await;
+    // TODO: Check this ID is sane (last handled ID or expected next ID)
     if last_msg == Some(msg.id) {
       sleep(Duration::from_secs(1)).await;
       continue;

coordinator/src/processors.rs

@@ -28,8 +28,7 @@ impl Processors for Arc<MessageQueue> {
     self.queue(metadata, msg.into_bytes()).await;
   }
   async fn recv(&mut self) -> Message {
-    // TODO: Use a proper expected next ID
-    let msg = self.next(0).await;
+    let msg = self.next().await;
 
     let network = match msg.from {
       Service::Processor(network) => network,

message-queue/src/client.rs

@@ -140,9 +140,9 @@ impl MessageQueue {
     }
   }
 
-  pub async fn next(&self, expected: u64) -> QueuedMessage {
+  pub async fn next(&self) -> QueuedMessage {
     loop {
-      let json = self.json_call("next", serde_json::json!([self.service, expected])).await;
+      let json = self.json_call("next", serde_json::json!([self.service])).await;
 
       // Convert from a Value to a type via reserialization
       let msg: Option<QueuedMessage> = serde_json::from_str(
@@ -174,7 +174,6 @@ impl MessageQueue {
         );
       }
       // TODO: Verify the sender's signature
-      // TODO: Check the ID is sane
 
       return msg;
     }

message-queue/src/main.rs

@@ -107,16 +107,11 @@ mod binaries {
   /*
     Gets the next message in queue for this service.
 
-    This is not authenticated due to the fact every nonce would have to be saved to prevent replays,
-    or a challenge-response protocol implemented. Neither are worth doing when there should be no
-    sensitive data on this server.
-
-    The expected index is used to ensure a service didn't fall out of sync with this service. It
-    should always be either the next message's ID or *TODO*.
+    This is not authenticated due to the fact every nonce would have to be saved to prevent
+    replays, or a challenge-response protocol implemented. Neither are worth doing when there
+    should be no sensitive data on this server.
   */
-  pub(crate) fn get_next_message(service: Service, _expected: u64) -> Option<QueuedMessage> {
-    // TODO: Verify the expected next message ID matches
-
+  pub(crate) fn get_next_message(service: Service) -> Option<QueuedMessage> {
     let queue_outer = (*QUEUES).read().unwrap();
     let queue = queue_outer[&service].read().unwrap();
     let next = queue.last_acknowledged().map(|i| i + 1).unwrap_or(0);
@@ -229,8 +224,8 @@ async fn main() {
     .unwrap();
   module
     .register_method("next", |args, _| {
-      let args = args.parse::<(Service, u64)>().unwrap();
-      Ok(get_next_message(args.0, args.1))
+      let args = args.parse::<Service>().unwrap();
+      Ok(get_next_message(args))
     })
     .unwrap();
   module

processor/src/coordinator.rs

@@ -25,8 +25,7 @@ impl Coordinator for MessageQueue {
   }
 
   async fn recv(&mut self) -> Message {
-    // TODO2: Use a proper expected next ID
-    let msg = self.next(0).await;
+    let msg = self.next().await;
 
     let id = msg.id;
 

processor/src/main.rs

@@ -471,6 +471,7 @@ async fn run<N: Network, D: Db, Co: Coordinator>(mut raw_db: D, network: N, mut
   let (main_db, mut tributary_mutable, mut substrate_mutable) = boot(&mut raw_db, &network).await;
 
   // We can't load this from the DB as we can't guarantee atomic increments with the ack function
+  // TODO: Load with a slight tolerance
   let mut last_coordinator_msg = None;
 
   loop {