add_item now returns a Result

src/calendar/cached_calendar.rs

@@ -72,8 +72,9 @@ impl PartialCalendar for CachedCalendar {
         self.supported_components
     }
 
-    async fn add_item(&mut self, item: Item) {
+    async fn add_item(&mut self, item: Item) -> Result<(), Box<dyn Error>> {
         self.items.insert(item.id().clone(), item);
+        Ok(())
     }
 
     async fn delete_item(&mut self, item_id: &ItemId) -> Result<(), Box<dyn Error>> {

src/calendar/remote_calendar.rs

@@ -92,8 +92,8 @@ impl PartialCalendar for RemoteCalendar {
 
 
     /// Add an item into this calendar
-    async fn add_item(&mut self, _item: Item) {
+    async fn add_item(&mut self, _item: Item) -> Result<(), Box<dyn Error>> {
-        log::error!("Not implemented");
+        Err("Not implemented".into())
     }
 
     /// Remove an item from this calendar

src/provider.rs

@@ -166,7 +166,11 @@ where
                         log::error!("Inconsistency: new item {} has vanished from the remote end", id_add);
                         continue;
                     },
-                    Some(new_item) => cal_local.add_item(new_item.clone()).await,
+                    Some(new_item) => {
+                        if let Err(err) = cal_local.add_item(new_item.clone()).await {
+                            log::error!("Not able to add item {} to local calendar: {}", id_add, err);
+                        }
+                    },
                 }
             }
 
@@ -180,7 +184,9 @@ where
                         if let Err(err) = cal_local.delete_item(&id_change).await {
                             log::error!("Unable to delete item {} from local calendar: {}", id_change, err);
                         }
-                        cal_local.add_item(item.clone());
+                        if let Err(err) = cal_local.add_item(item.clone()).await {
+                            log::error!("Unable to add item {} to local calendar: {}", id_change, err);
+                        }
                     },
                 }
             }
@@ -192,7 +198,11 @@ where
                         log::error!("Inconsistency: created item {} has been marked for upload but is locally missing", id_add);
                         continue;
                     },
-                    Some(item) => cal_remote.add_item(item.clone()),
+                    Some(item) => {
+                        if let Err(err) = cal_remote.add_item(item.clone()).await {
+                            log::error!("Unable to add item {} to remote calendar: {}", id_add, err);
+                        }
+                    }
                 };
             }
 
@@ -206,7 +216,9 @@ where
                         if let Err(err) = cal_remote.delete_item(&id_change).await {
                             log::error!("Unable to delete item {} from remote calendar: {}", id_change, err);
                         }
-                        cal_remote.add_item(item.clone());
+                        if let Err(err) = cal_remote.add_item(item.clone()).await {
+                            log::error!("Unable to add item {} to remote calendar: {}", id_change, err);
+                        }
                     }
                 };
             }

src/traits.rs

@@ -42,7 +42,7 @@ pub trait PartialCalendar {
     async fn get_item_by_id<'a>(&'a self, id: &ItemId) -> Option<&'a Item>;
 
     /// Add an item into this calendar
-    async fn add_item(&mut self, item: Item);
+    async fn add_item(&mut self, item: Item) -> Result<(), Box<dyn Error>>;
 
     /// Remove an item from this calendar
     async fn delete_item(&mut self, item_id: &ItemId) -> Result<(), Box<dyn Error>>;

tests/sync.rs

@@ -84,19 +84,19 @@ async fn populate_test_provider() -> Provider<Cache, CachedCalendar, Cache, Cach
     // Step 1
     // Build the calendar as it was at the time of the sync
     let mut calendar = CachedCalendar::new("a list".into(), cal_id.clone(), my_tasks::calendar::SupportedComponents::TODO);
-    calendar.add_item(task_a).await;
+    calendar.add_item(task_a).await.unwrap();
-    calendar.add_item(task_b).await;
+    calendar.add_item(task_b).await.unwrap();
-    calendar.add_item(task_c).await;
+    calendar.add_item(task_c).await.unwrap();
-    calendar.add_item(task_d).await;
+    calendar.add_item(task_d).await.unwrap();
-    calendar.add_item(task_e).await;
+    calendar.add_item(task_e).await.unwrap();
-    calendar.add_item(task_f).await;
+    calendar.add_item(task_f).await.unwrap();
-    calendar.add_item(task_g).await;
+    calendar.add_item(task_g).await.unwrap();
-    calendar.add_item(task_h).await;
+    calendar.add_item(task_h).await.unwrap();
-    calendar.add_item(task_i).await;
+    calendar.add_item(task_i).await.unwrap();
-    calendar.add_item(task_j).await;
+    calendar.add_item(task_j).await.unwrap();
-    calendar.add_item(task_k).await;
+    calendar.add_item(task_k).await.unwrap();
-    calendar.add_item(task_l).await;
+    calendar.add_item(task_l).await.unwrap();
-    calendar.add_item(task_m).await;
+    calendar.add_item(task_m).await.unwrap();
 
     server.add_calendar(Arc::new(Mutex::new(calendar.clone())));
     local.add_calendar(Arc::new(Mutex::new(calendar.clone())));
@@ -128,7 +128,7 @@ async fn populate_test_provider() -> Provider<Cache, CachedCalendar, Cache, Cach
     cal_server.delete_item(&task_l_id).await.unwrap();
 
     let task_n = Item::Task(Task::new("task N (new from server)".into(), ItemId::random(), SyncStatus::random_synced()));
-    cal_server.add_item(task_n).await;
+    cal_server.add_item(task_n).await.unwrap();
 
 
     // Step 3
@@ -157,7 +157,7 @@ async fn populate_test_provider() -> Provider<Cache, CachedCalendar, Cache, Cach
     cal_local.mark_for_deletion(&task_l_id).await.unwrap();
 
     let task_o = Item::Task(Task::new("task O (new from local)".into(), ItemId::random(), SyncStatus::NotSynced));
-    cal_local.add_item(task_o).await;
+    cal_local.add_item(task_o).await.unwrap();
 
     Provider::new(server, local)
 }