fix(network): notify the request sender on response decoding error

CHANGELOG.md

@@ -23,6 +23,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - request: now `RequestError::Ignored` can be returned only if the envelope is received.
 - macros: allow generic requests in `msg!`: `msg!(match e { (R, token) => .. })`.
+- network: notify the request sender on response decoding error ([#102]).
+
+[#102]: https://github.com/elfo-rs/elfo/pull/102
 
 ## [0.2.0-alpha.4] - 2023-07-06
 

elfo-network/src/worker/mod.rs

@@ -28,7 +28,10 @@ use self::{
 use crate::{
     codec::{
         decode::EnvelopeDetails,
-        format::{NetworkEnvelope, NetworkEnvelopePayload, KIND_REQUEST_ALL, KIND_REQUEST_ANY},
+        format::{
+            NetworkEnvelope, NetworkEnvelopePayload, KIND_REQUEST_ALL, KIND_REQUEST_ANY,
+            KIND_RESPONSE_FAILED, KIND_RESPONSE_IGNORED, KIND_RESPONSE_OK,
+        },
     },
     frame::write::FrameState,
     protocol::{internode, HandleConnection},
@@ -418,6 +421,27 @@ impl SocketReader {
             // below.
             self.tx_flows.add_flow_if_needed(details.sender);
             sender.respond(token, Err(RequestError::Failed));
+        } else if details.kind == KIND_RESPONSE_OK
+            || details.kind == KIND_RESPONSE_FAILED
+            || details.kind == KIND_RESPONSE_IGNORED
+        {
+            let Some(token) = self
+                .requests
+                .lock()
+                .get_token(details.recipient, details.request_id.expect("bug: request_id is missing"), true)
+            else {
+                warn!(
+                    message = "received response to unknown request",
+                    kind = %details.kind,
+                    sender = %details.sender,
+                    recipient = %details.recipient,
+                    request_id = ?details.request_id,
+                );
+                return;
+            };
+
+            // Dropped token will notify the request sender that the request failed.
+            drop(token);
         }
     }