deps: update jsonrpsee 0.2.0 (#285)

* deps: update jsonrpsee 0.2.0

The motivation is to avoid pinning certain alpha versions and to avoid
breaking users builds without having to some `Cargo.lock` updating.

* cargo fmt

* fix tests

* fix a few clippy lints

* cargo fmt

src/subscription.rs

@@ -14,7 +14,10 @@
 // You should have received a copy of the GNU General Public License
 // along with substrate-subxt.  If not, see <http://www.gnu.org/licenses/>.
 
-use jsonrpsee_ws_client::Subscription;
+use jsonrpsee_types::{
+    DeserializeOwned,
+    Subscription,
+};
 use sp_core::{
     storage::{
         StorageChangeSet,
@@ -176,7 +179,9 @@ impl<T: Runtime> FinalizedEventStorageSubscription<T> {
             if let Some(storage_change) = self.storage_changes.pop_front() {
                 return Some(storage_change)
             }
-            let header: T::Header = self.subscription.next().await?;
+            let header: T::Header =
+                read_subscription_response("HeaderSubscription", &mut self.subscription)
+                    .await?;
             self.storage_changes.extend(
                 self.rpc
                     .query_storage_at(&[self.storage_key.clone()], Some(header.hash()))
@@ -199,8 +204,28 @@ impl<T: Runtime> EventStorageSubscription<T> {
     /// Gets the next change_set from the subscription.
     pub async fn next(&mut self) -> Option<StorageChangeSet<T::Hash>> {
         match self {
-            Self::Imported(event_sub) => event_sub.next().await,
+            Self::Imported(event_sub) => {
+                read_subscription_response("StorageChangeSetSubscription", event_sub)
+                    .await
+            }
             Self::Finalized(event_sub) => event_sub.next().await,
         }
     }
 }
+
+async fn read_subscription_response<T>(
+    sub_name: &str,
+    sub: &mut Subscription<T>,
+) -> Option<T>
+where
+    T: DeserializeOwned,
+{
+    match sub.next().await {
+        Ok(Some(next)) => Some(next),
+        Ok(None) => None,
+        Err(e) => {
+            log::error!("Subscription {} failed: {:?} dropping", sub_name, e);
+            None
+        }
+    }
+}