Return correct status on cancel

src/core/ext/transport/cronet/transport/cronet_transport.c

@@ -151,6 +151,7 @@ struct op_state {
   bool state_callback_received[OP_NUM_OPS];
   bool fail_state;
   bool flush_read;
+  grpc_error *cancel_error;
   /* data structure for storing data coming from server */
   struct read_state rs;
   /* data structure for storing data going to the server */
@@ -250,6 +251,12 @@ static void free_read_buffer(stream_obj *s) {
   }
 }
 
+static grpc_error* make_error_with_desc(int error_code, const char *desc) {
+  grpc_error *error = GRPC_ERROR_CREATE(desc);
+  error = grpc_error_set_int(error, GRPC_ERROR_INT_GRPC_STATUS, error_code);
+  return error;
+}
+
 /*
   Add a new stream op to op storage.
 */
@@ -817,17 +824,10 @@ static enum e_op_result execute_stream_op(grpc_exec_ctx *exec_ctx,
       op_can_be_run(stream_op, stream_state, &oas->state,
                     OP_SEND_INITIAL_METADATA)) {
     CRONET_LOG(GPR_DEBUG, "running: %p OP_SEND_INITIAL_METADATA", oas);
-    /* This OP is the beginning. Reset various states */
-    stream_state->fail_state = stream_state->flush_read = false;
-    memset(&s->header_array, 0, sizeof(s->header_array));
-    memset(&stream_state->rs, 0, sizeof(stream_state->rs));
-    memset(&stream_state->ws, 0, sizeof(stream_state->ws));
-    memset(stream_state->state_op_done, 0, sizeof(stream_state->state_op_done));
-    memset(stream_state->state_callback_received, 0,
-           sizeof(stream_state->state_callback_received));
     /* Start new cronet stream. It is destroyed in on_succeeded, on_canceled,
      * on_failed */
     GPR_ASSERT(s->cbs == NULL);
+    GPR_ASSERT(!stream_state->state_op_done[OP_SEND_INITIAL_METADATA]);
     s->cbs = cronet_bidirectional_stream_create(s->curr_ct.engine, s->curr_gs,
                                                 &cronet_callbacks);
     CRONET_LOG(GPR_DEBUG, "%p = cronet_bidirectional_stream_create()", s->cbs);
@@ -848,10 +848,11 @@ static enum e_op_result execute_stream_op(grpc_exec_ctx *exec_ctx,
              op_can_be_run(stream_op, stream_state, &oas->state,
                            OP_RECV_INITIAL_METADATA)) {
     CRONET_LOG(GPR_DEBUG, "running: %p  OP_RECV_INITIAL_METADATA", oas);
-    if (stream_state->state_op_done[OP_CANCEL_ERROR] ||
+    if (stream_state->state_op_done[OP_CANCEL_ERROR]) {
-        stream_state->state_callback_received[OP_FAILED]) {
       grpc_exec_ctx_sched(exec_ctx, stream_op->recv_initial_metadata_ready,
                           GRPC_ERROR_CANCELLED, NULL);
+    } else if (stream_state->state_callback_received[OP_FAILED]) {
+      grpc_exec_ctx_sched(exec_ctx, stream_op->recv_initial_metadata_ready, make_error_with_desc(GRPC_STATUS_UNAVAILABLE, "Unavailable."), NULL);
     } else {
       grpc_chttp2_incoming_metadata_buffer_publish(
           &oas->s->state.rs.initial_metadata, stream_op->recv_initial_metadata);
@@ -905,12 +906,16 @@ static enum e_op_result execute_stream_op(grpc_exec_ctx *exec_ctx,
              op_can_be_run(stream_op, stream_state, &oas->state,
                            OP_RECV_MESSAGE)) {
     CRONET_LOG(GPR_DEBUG, "running: %p  OP_RECV_MESSAGE", oas);
-    if (stream_state->state_op_done[OP_CANCEL_ERROR] ||
+    if (stream_state->state_op_done[OP_CANCEL_ERROR]) {
-        stream_state->state_callback_received[OP_FAILED]) {
+      CRONET_LOG(GPR_DEBUG, "Stream is cancelled.");
-      CRONET_LOG(GPR_DEBUG, "Stream is either cancelled or failed.");
       grpc_exec_ctx_sched(exec_ctx, stream_op->recv_message_ready,
                           GRPC_ERROR_CANCELLED, NULL);
       stream_state->state_op_done[OP_RECV_MESSAGE] = true;
+    } else if (stream_state->state_callback_received[OP_FAILED]) {
+      CRONET_LOG(GPR_DEBUG, "Stream failed.");
+      grpc_exec_ctx_sched(exec_ctx, stream_op->recv_message_ready,
+                          make_error_with_desc(GRPC_STATUS_UNAVAILABLE, "Unavailable."), NULL);
+      stream_state->state_op_done[OP_RECV_MESSAGE] = true;
     } else if (stream_state->rs.read_stream_closed == true) {
       /* No more data will be received */
       CRONET_LOG(GPR_DEBUG, "read stream closed");
@@ -1031,17 +1036,23 @@ static enum e_op_result execute_stream_op(grpc_exec_ctx *exec_ctx,
     CRONET_LOG(GPR_DEBUG, "W: cronet_bidirectional_stream_cancel(%p)", s->cbs);
     if (s->cbs) {
       cronet_bidirectional_stream_cancel(s->cbs);
+      result = ACTION_TAKEN_WITH_CALLBACK;
+    } else {
+      result = ACTION_TAKEN_NO_CALLBACK;
     }
     stream_state->state_op_done[OP_CANCEL_ERROR] = true;
-    result = ACTION_TAKEN_WITH_CALLBACK;
+    if (!stream_state->cancel_error) {
+      stream_state->cancel_error = GRPC_ERROR_REF(stream_op->cancel_error);
+    }
   } else if (stream_op->on_complete &&
              op_can_be_run(stream_op, stream_state, &oas->state,
                            OP_ON_COMPLETE)) {
     CRONET_LOG(GPR_DEBUG, "running: %p  OP_ON_COMPLETE", oas);
-    if (stream_state->state_op_done[OP_CANCEL_ERROR] ||
+    if (stream_state->state_op_done[OP_CANCEL_ERROR]) {
-        stream_state->state_callback_received[OP_FAILED]) {
       grpc_exec_ctx_sched(exec_ctx, stream_op->on_complete,
-                          GRPC_ERROR_CANCELLED, NULL);
+                          GRPC_ERROR_REF(stream_state->cancel_error), NULL);
+    } else if (stream_state->state_callback_received[OP_FAILED]) {
+      grpc_exec_ctx_sched(exec_ctx, stream_op->on_complete, make_error_with_desc(GRPC_STATUS_UNAVAILABLE, "Unavailable."), NULL);
     } else {
       /* All actions in this stream_op are complete. Call the on_complete
        * callback
@@ -1096,6 +1107,8 @@ static int init_stream(grpc_exec_ctx *exec_ctx, grpc_transport *gt,
   memset(s->state.state_op_done, 0, sizeof(s->state.state_op_done));
   memset(s->state.state_callback_received, 0,
          sizeof(s->state.state_callback_received));
+  s->state.fail_state = s->state.flush_read = false;
+  s->state.cancel_error = NULL;
   gpr_mu_init(&s->mu);
   return 0;
 }
@@ -1142,7 +1155,10 @@ static void perform_stream_op(grpc_exec_ctx *exec_ctx, grpc_transport *gt,
 }
 
 static void destroy_stream(grpc_exec_ctx *exec_ctx, grpc_transport *gt,
-                           grpc_stream *gs, void *and_free_memory) {}
+                           grpc_stream *gs, void *and_free_memory) {
+  stream_obj *s = (stream_obj *)gs;
+  GRPC_ERROR_UNREF(s->state.cancel_error);
+}
 
 static void destroy_transport(grpc_exec_ctx *exec_ctx, grpc_transport *gt) {}