service/btc: Expire subscription after 10 minutes.

src/service/btc.rs

@@ -216,12 +216,24 @@ impl BtcClient {
 
         let status = client.script_subscribe(&script)?;
 
+        let iter_interval = 5;
+        let mut sub_iter = 0;
+
         loop {
+            if sub_iter > 60 * 10 {
+                // 10 minutes
+                return Err(BtcFailed::ElectrumError(format!(
+                    "Deposit for {:?} expired",
+                    script
+                )));
+            }
+            sub_iter += iter_interval;
+
             let current_status = client.script_pop(&script)?;
             debug!(target: "BTC BRIDGE", "script status: {:?}", status);
             debug!(target: "BTC BRIDGE", "current_script status: {:?}", current_status);
             if current_status == status {
-                async_std::task::sleep(Duration::from_secs(5)).await;
+                async_std::task::sleep(Duration::from_secs(iter_interval)).await;
                 debug!(
                     target: "BTC BRIDGE",
                     "ScriptPubKey status has not changed, amtucfd: {}, amtcfd: {}",