From 863e468df9d70c3d7268e96378c03b1cf7333f88 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Sun, 31 Mar 2024 17:08:29 +0200
Subject: wallet-core: denom loss notifications

---
 packages/taler-wallet-core/src/exchanges.ts | 120 +++++++++++++++++++++++-----
 1 file changed, 98 insertions(+), 22 deletions(-)

(limited to 'packages/taler-wallet-core/src')

diff --git a/packages/taler-wallet-core/src/exchanges.ts b/packages/taler-wallet-core/src/exchanges.ts
index 2680ede78..48d8d4972 100644
--- a/packages/taler-wallet-core/src/exchanges.ts
+++ b/packages/taler-wallet-core/src/exchanges.ts
@@ -137,7 +137,10 @@ import {
 import { DbReadOnlyTransaction } from "./query.js";
 import { createRecoupGroup } from "./recoup.js";
 import { createRefreshGroup } from "./refresh.js";
-import { constructTransactionIdentifier } from "./transactions.js";
+import {
+  constructTransactionIdentifier,
+  notifyTransition,
+} from "./transactions.js";
 import { WALLET_EXCHANGE_PROTOCOL_VERSION } from "./versions.js";
 import { InternalWalletState, WalletExecutionContext } from "./wallet.js";
 
@@ -1419,8 +1422,6 @@ export async function updateExchangeFromUrlHandler(
   let noFees = checkNoFees(keysInfo);
   let peerPaymentsDisabled = checkPeerPaymentsDisabled(keysInfo);
 
-  let denomLossResult: boolean = false;
-
   const updated = await wex.db.runReadWriteTx(
     [
       "exchanges",
@@ -1565,7 +1566,7 @@ export async function updateExchangeFromUrlHandler(
 
       logger.trace("done updating denominations in database");
 
-      denomLossResult = await handleDenomLoss(
+      const denomLossResult = await handleDenomLoss(
         wex,
         tx,
         newDetails.currency,
@@ -1581,6 +1582,7 @@ export async function updateExchangeFromUrlHandler(
         exchangeDetails: newDetails,
         oldExchangeState,
         newExchangeState,
+        denomLossResult,
       };
     },
   );
@@ -1589,11 +1591,10 @@ export async function updateExchangeFromUrlHandler(
     throw Error("something went wrong with updating the exchange");
   }
 
-  if (denomLossResult) {
-    wex.ws.notify({
-      type: NotificationType.BalanceChange,
-      hintTransactionId: "denom-loss:*",
-    });
+  if (updated.denomLossResult) {
+    for (const notif of updated.denomLossResult.notifications) {
+      wex.ws.notify(notif);
+    }
   }
 
   logger.trace("done updating exchange info in database");
@@ -1689,6 +1690,10 @@ export async function updateExchangeFromUrlHandler(
   return TaskRunResult.progress();
 }
 
+interface DenomLossResult {
+  notifications: WalletNotification[];
+}
+
 async function handleDenomLoss(
   wex: WalletExecutionContext,
   tx: WalletDbReadWriteTransaction<
@@ -1696,7 +1701,7 @@ async function handleDenomLoss(
   >,
   currency: string,
   exchangeBaseUrl: string,
-): Promise<boolean> {
+): Promise<DenomLossResult> {
   const coinAvailabilityRecs =
     await tx.coinAvailability.indexes.byExchangeBaseUrl.getAll(exchangeBaseUrl);
   const denomsVanished: string[] = [];
@@ -1706,6 +1711,10 @@ async function handleDenomLoss(
   let amountExpired = Amount.zeroOfCurrency(currency);
   let amountUnoffered = Amount.zeroOfCurrency(currency);
 
+  const result: DenomLossResult = {
+    notifications: [],
+  };
+
   for (const coinAv of coinAvailabilityRecs) {
     if (coinAv.freshCoinCount <= 0) {
       continue;
@@ -1746,12 +1755,11 @@ async function handleDenomLoss(
       continue;
     }
   }
-  let hadLoss = false;
 
   if (denomsVanished.length > 0) {
-    hadLoss = true;
+    const denomLossEventId = encodeCrock(getRandomBytes(32));
     await tx.denomLossEvents.add({
-      denomLossEventId: encodeCrock(getRandomBytes(32)),
+      denomLossEventId,
       amount: amountVanished.toString(),
       currency,
       exchangeBaseUrl,
@@ -1760,12 +1768,30 @@ async function handleDenomLoss(
       status: DenomLossStatus.Done,
       timestampCreated: timestampPreciseToDb(TalerPreciseTimestamp.now()),
     });
+    const transactionId = constructTransactionIdentifier({
+      tag: TransactionType.DenomLoss,
+      denomLossEventId,
+    });
+    result.notifications.push({
+      type: NotificationType.TransactionStateTransition,
+      transactionId,
+      oldTxState: {
+        major: TransactionMajorState.None,
+      },
+      newTxState: {
+        major: TransactionMajorState.Done,
+      },
+    });
+    result.notifications.push({
+      type: NotificationType.BalanceChange,
+      hintTransactionId: transactionId,
+    });
   }
 
   if (denomsUnoffered.length > 0) {
-    hadLoss = true;
+    const denomLossEventId = encodeCrock(getRandomBytes(32));
     await tx.denomLossEvents.add({
-      denomLossEventId: encodeCrock(getRandomBytes(32)),
+      denomLossEventId,
       amount: amountUnoffered.toString(),
       currency,
       exchangeBaseUrl,
@@ -1774,12 +1800,30 @@ async function handleDenomLoss(
       status: DenomLossStatus.Done,
       timestampCreated: timestampPreciseToDb(TalerPreciseTimestamp.now()),
     });
+    const transactionId = constructTransactionIdentifier({
+      tag: TransactionType.DenomLoss,
+      denomLossEventId,
+    });
+    result.notifications.push({
+      type: NotificationType.TransactionStateTransition,
+      transactionId,
+      oldTxState: {
+        major: TransactionMajorState.None,
+      },
+      newTxState: {
+        major: TransactionMajorState.Done,
+      },
+    });
+    result.notifications.push({
+      type: NotificationType.BalanceChange,
+      hintTransactionId: transactionId,
+    });
   }
 
   if (denomsExpired.length > 0) {
-    hadLoss = true;
+    const denomLossEventId = encodeCrock(getRandomBytes(32));
     await tx.denomLossEvents.add({
-      denomLossEventId: encodeCrock(getRandomBytes(32)),
+      denomLossEventId,
       amount: amountExpired.toString(),
       currency,
       exchangeBaseUrl,
@@ -1788,9 +1832,27 @@ async function handleDenomLoss(
       status: DenomLossStatus.Done,
       timestampCreated: timestampPreciseToDb(TalerPreciseTimestamp.now()),
     });
+    const transactionId = constructTransactionIdentifier({
+      tag: TransactionType.DenomLoss,
+      denomLossEventId,
+    });
+    result.notifications.push({
+      type: NotificationType.TransactionStateTransition,
+      transactionId,
+      oldTxState: {
+        major: TransactionMajorState.None,
+      },
+      newTxState: {
+        major: TransactionMajorState.Done,
+      },
+    });
+    result.notifications.push({
+      type: NotificationType.BalanceChange,
+      hintTransactionId: transactionId,
+    });
   }
 
-  return hadLoss;
+  return result;
 }
 
 export function computeDenomLossTransactionStatus(
@@ -1827,10 +1889,24 @@ export class DenomLossTransactionContext implements TransactionContext {
     throw new Error("Method not implemented.");
   }
   async deleteTransaction(): Promise<void> {
-    await this.wex.db.runReadWriteTx(["denomLossEvents"], async (tx) => {
-      await tx.denomLossEvents.delete(this.denomLossEventId);
-    });
-    throw new Error("Method not implemented.");
+    const transitionInfo = await this.wex.db.runReadWriteTx(
+      ["denomLossEvents"],
+      async (tx) => {
+        const rec = await tx.denomLossEvents.get(this.denomLossEventId);
+        if (rec) {
+          const oldTxState = computeDenomLossTransactionStatus(rec);
+          await tx.denomLossEvents.delete(this.denomLossEventId);
+          return {
+            oldTxState,
+            newTxState: {
+              major: TransactionMajorState.Deleted,
+            },
+          };
+        }
+        return undefined;
+      },
+    );
+    notifyTransition(this.wex, this.transactionId, transitionInfo);
   }
 
   constructor(
-- 
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