fix: dual mode needs its own spawn_sweeper (#658)

Issue: SYNC-4176

autoconnect/autoconnect-settings/src/app_state.rs

@@ -86,7 +86,11 @@ impl AppState {
                 Box::new(client)
             }
             #[cfg(all(feature = "bigtable", feature = "dynamodb"))]
-            StorageType::Dual => Box::new(DualClientImpl::new(metrics.clone(), &db_settings)?),
+            StorageType::Dual => {
+                let client = DualClientImpl::new(metrics.clone(), &db_settings)?;
+                client.spawn_sweeper(Duration::from_secs(30));
+                Box::new(client)
+            }
             _ => panic!(
                 "Invalid Storage type {:?}. Check {}__DB_DSN.",
                 storage_type,

autoendpoint/src/server.rs

@@ -80,7 +80,11 @@ impl Server {
                 Box::new(client)
             }
             #[cfg(all(feature = "bigtable", feature = "dual"))]
-            StorageType::Dual => Box::new(DualClientImpl::new(metrics.clone(), &db_settings)?),
+            StorageType::Dual => {
+                let client = DualClientImpl::new(metrics.clone(), &db_settings)?;
+                client.spawn_sweeper(Duration::from_secs(30));
+                Box::new(client)
+            }
             _ => {
                 debug!("No idea what {:?} is", &db_settings.dsn);
                 return Err(ApiErrorKind::General(

autopush-common/src/db/dual/mod.rs

@@ -6,8 +6,7 @@
 //!
 //! This requires both the `dynamodb` and `bigtable` features.
 //!
-use std::collections::HashSet;
-use std::sync::Arc;
+use std::{collections::HashSet, sync::Arc, time::Duration};
 
 use async_trait::async_trait;
 use cadence::{CountedExt, StatsdClient, Timed};
@@ -114,6 +113,11 @@ impl DualClientImpl {
             metrics,
         })
     }
+
+    /// Spawn a task to periodically evict idle Bigtable connections
+    pub fn spawn_sweeper(&self, interval: Duration) {
+        self.primary.spawn_sweeper(interval);
+    }
 }
 
 /// Wrapper functions to allow us to change which data store system actually manages the