Read the latest mint quote status in a transaction to avoid race conditions (#1166)

* Read the latest mint quote status in a transaction to avoid race conditions

Fixes #1162

* Reload quote for all cases

* Exit on paid invoices only for bolt11

Author: crodas

crates/cdk/src/mint/ln.rs

@@ -45,6 +45,20 @@ impl Mint {
 
         let mut tx = self.localstore.begin_transaction().await?;
 
+        // reload the quote, as it state may have changed
+        *quote = tx
+            .get_mint_quote(&quote.id)
+            .await?
+            .ok_or(Error::UnknownQuote)?;
+
+        let current_state = quote.state();
+
+        if quote.payment_method == PaymentMethod::Bolt11
+            && (current_state == MintQuoteState::Issued || current_state == MintQuoteState::Paid)
+        {
+            return Ok(());
+        }
+
         for payment in ln_status {
             if !quote.payment_ids().contains(&&payment.payment_id)
                 && payment.payment_amount > Amount::ZERO