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return none if subscription returns early (#250)

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* return none if subscription returns early

Signed-off-by: Gregory Hill <gregorydhill@outlook.com>

* add comment on subscription close

Signed-off-by: Gregory Hill <gregorydhill@outlook.com>

* no need for jsonrpsee error enum

Signed-off-by: Gregory Hill <gregorydhill@outlook.com>
This commit is contained in:
Greg Hill
2021-03-22 10:55:14 +00:00
committed by GitHub
parent 055ebff52d
commit cb4bee5c03
1 changed files with 8 additions and 16 deletions
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src/subscription.rs
+8 -16
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@@ -14,7 +14,6 @@
// 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_types::error::Error as RpcError;
use jsonrpsee_ws_client::WsSubscription as Subscription;
use sp_core::{
storage::{
@@ -95,14 +94,8 @@ impl<'a, T: Runtime> EventSubscription<'a, T> {
if self.finished {
return None
}
let change_set = match self.subscription.next().await {
Some(c) => c,
None => {
return Some(Err(
RpcError::Custom("RPC subscription dropped".into()).into()
))
}
};
// always return None if subscription has closed
let change_set = self.subscription.next().await?;
if let Some(hash) = self.block.as_ref() {
if &change_set.block == hash {
self.finished = true;
@@ -184,13 +177,12 @@ impl<T: Runtime> FinalizedEventStorageSubscription<T> {
return Some(storage_change)
}
let header: T::Header = self.subscription.next().await?;
if let Ok(storage_changes) = self
.rpc
.query_storage_at(&[self.storage_key.clone()], Some(header.hash()))
.await
{
self.storage_changes.extend(storage_changes);
}
self.storage_changes.extend(
self.rpc
.query_storage_at(&[self.storage_key.clone()], Some(header.hash()))
.await
.ok()?,
);
}
}
}