[taler-wallet-core] 01/02: tombstone processing in backup import

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dold pushed a commit to branch master
in repository wallet-core.

commit 6b1aea426a5cb0d6d33757ccaafee831f4875c8c
Author: Florian Dold <florian@dold.me>
AuthorDate: Fri May 21 11:47:11 2021 +0200

    tombstone processing in backup import
---
 packages/taler-wallet-core/src/db.ts               |  5 ++
 .../src/operations/backup/import.ts                | 78 ++++++++++++++++++++++
 .../src/operations/backup/state.ts                 |  3 -
 .../src/operations/transactions.ts                 |  2 +-
 4 files changed, 84 insertions(+), 4 deletions(-)

diff --git a/packages/taler-wallet-core/src/db.ts 
b/packages/taler-wallet-core/src/db.ts
index 609f43ea..0ff34d3c 100644
--- a/packages/taler-wallet-core/src/db.ts
+++ b/packages/taler-wallet-core/src/db.ts
@@ -1546,6 +1546,11 @@ export interface BackupProviderTerms {
 }
 
 export interface BackupProviderRecord {
+  /**
+   * Base URL of the provider.
+   * 
+   * Primary key for the record.
+   */
   baseUrl: string;
 
   /**
diff --git a/packages/taler-wallet-core/src/operations/backup/import.ts 
b/packages/taler-wallet-core/src/operations/backup/import.ts
index 931e6f92..1bbba6e2 100644
--- a/packages/taler-wallet-core/src/operations/backup/import.ts
+++ b/packages/taler-wallet-core/src/operations/backup/import.ts
@@ -55,6 +55,7 @@ import { Logger } from "../../util/logging";
 import { initRetryInfo } from "../../util/retries";
 import { InternalWalletState } from "../state";
 import { provideBackupState } from "./state";
+import { makeEventId, TombstoneTag } from "../transactions.js";
 
 const logger = new Logger("operations/backup/import.ts");
 
@@ -121,6 +122,7 @@ async function recoverPayCoinSelection(
       if (wireFee) {
         totalWireFee = Amounts.add(totalWireFee, wireFee).amount;
       }
+      coveredExchanges.add(coinRecord.exchangeBaseUrl);
     }
   }
 
@@ -226,6 +228,8 @@ export async function importBackup(
       Stores.recoupGroups,
       Stores.reserves,
       Stores.withdrawalGroups,
+      Stores.tombstones,
+      Stores.depositGroups,
     ],
     async (tx) => {
       // FIXME: validate schema!
@@ -233,6 +237,14 @@ export async function importBackup(
 
       // FIXME: validate version
 
+      for (const tombstone of backupBlob.tombstones) {
+        await tx.put(Stores.tombstones, {
+          id: tombstone,
+        });
+      }
+
+      const tombstoneSet = new Set(backupBlob.tombstones);
+
       for (const backupExchange of backupBlob.exchanges) {
         const existingExchange = await tx.get(
           Stores.exchanges,
@@ -381,6 +393,10 @@ export async function importBackup(
         for (const backupReserve of backupExchange.reserves) {
           const reservePub =
             cryptoComp.reservePrivToPub[backupReserve.reserve_priv];
+          const ts = makeEventId(TombstoneTag.DeleteReserve, reservePub);
+          if (tombstoneSet.has(ts)) {
+            continue;
+          }
           checkLogicInvariant(!!reservePub);
           const existingReserve = await tx.get(Stores.reserves, reservePub);
           const instructedAmount = Amounts.parseOrThrow(
@@ -426,6 +442,13 @@ export async function importBackup(
             });
           }
           for (const backupWg of backupReserve.withdrawal_groups) {
+            const ts = makeEventId(
+              TombstoneTag.DeleteWithdrawalGroup,
+              backupWg.withdrawal_group_id,
+            );
+            if (tombstoneSet.has(ts)) {
+              continue;
+            }
             const existingWg = await tx.get(
               Stores.withdrawalGroups,
               backupWg.withdrawal_group_id,
@@ -456,6 +479,13 @@ export async function importBackup(
       }
 
       for (const backupProposal of backupBlob.proposals) {
+        const ts = makeEventId(
+          TombstoneTag.DeletePayment,
+          backupProposal.proposal_id,
+        );
+        if (tombstoneSet.has(ts)) {
+          continue;
+        }
         const existingProposal = await tx.get(
           Stores.proposals,
           backupProposal.proposal_id,
@@ -555,6 +585,13 @@ export async function importBackup(
       }
 
       for (const backupPurchase of backupBlob.purchases) {
+        const ts = makeEventId(
+          TombstoneTag.DeletePayment,
+          backupPurchase.proposal_id,
+        );
+        if (tombstoneSet.has(ts)) {
+          continue;
+        }
         const existingPurchase = await tx.get(
           Stores.purchases,
           backupPurchase.proposal_id,
@@ -704,6 +741,13 @@ export async function importBackup(
       }
 
       for (const backupRefreshGroup of backupBlob.refresh_groups) {
+        const ts = makeEventId(
+          TombstoneTag.DeleteRefreshGroup,
+          backupRefreshGroup.refresh_group_id,
+        );
+        if (tombstoneSet.has(ts)) {
+          continue;
+        }
         const existingRg = await tx.get(
           Stores.refreshGroups,
           backupRefreshGroup.refresh_group_id,
@@ -783,6 +827,10 @@ export async function importBackup(
       }
 
       for (const backupTip of backupBlob.tips) {
+        const ts = makeEventId(TombstoneTag.DeleteTip, 
backupTip.wallet_tip_id);
+        if (tombstoneSet.has(ts)) {
+          continue;
+        }
         const existingTip = await tx.get(Stores.tips, backupTip.wallet_tip_id);
         if (!existingTip) {
           const denomsSel = await getDenomSelStateFromBackup(
@@ -809,6 +857,36 @@ export async function importBackup(
           });
         }
       }
+
+      // We now process tombstones.
+      // The import code above should already prevent
+      // importing things that are tombstoned,
+      // but we do tombstone processing last just to be sure.
+
+      for (const tombstone of backupBlob.tombstones) {
+        const [type, ...rest] = tombstone.split(":");
+        if (type === TombstoneTag.DeleteDepositGroup) {
+          await tx.delete(Stores.depositGroups, rest[0]);
+        } else if (type === TombstoneTag.DeletePayment) {
+          await tx.delete(Stores.purchases, rest[0]);
+          await tx.delete(Stores.proposals, rest[0]);
+        } else if (type === TombstoneTag.DeleteRefreshGroup) {
+          await tx.delete(Stores.refreshGroups, rest[0]);
+        } else if (type === TombstoneTag.DeleteRefund) {
+          // Nothing required, will just prevent display
+          // in the transactions list
+        } else if (type === TombstoneTag.DeleteReserve) {
+          // FIXME:  Once we also have account (=kyc) reserves,
+          // we need to check if the reserve is an account before deleting here
+          await tx.delete(Stores.reserves, rest[0]);
+        } else if (type === TombstoneTag.DeleteTip) {
+          await tx.delete(Stores.tips, rest[0]);
+        } else if (type === TombstoneTag.DeleteWithdrawalGroup) {
+          await tx.delete(Stores.withdrawalGroups, rest[0]);
+        } else {
+          logger.warn(`unable to process tombstone of type '${type}'`);
+        }
+      }
     },
   );
 }
diff --git a/packages/taler-wallet-core/src/operations/backup/state.ts 
b/packages/taler-wallet-core/src/operations/backup/state.ts
index 686c307a..e2a0f4cf 100644
--- a/packages/taler-wallet-core/src/operations/backup/state.ts
+++ b/packages/taler-wallet-core/src/operations/backup/state.ts
@@ -28,9 +28,6 @@ export interface WalletBackupConfState {
 
   /**
    * Last hash of the canonicalized plain-text backup.
-   *
-   * Used to determine whether the wallet's content changed
-   * and we need to bump the clock.
    */
   lastBackupPlainHash?: string;
 
diff --git a/packages/taler-wallet-core/src/operations/transactions.ts 
b/packages/taler-wallet-core/src/operations/transactions.ts
index 02550a11..70cd7496 100644
--- a/packages/taler-wallet-core/src/operations/transactions.ts
+++ b/packages/taler-wallet-core/src/operations/transactions.ts
@@ -42,7 +42,7 @@ import { getFundingPaytoUris } from "./reserves";
 /**
  * Create an event ID from the type and the primary key for the event.
  */
-function makeEventId(
+export function makeEventId(
   type: TransactionType | TombstoneTag,
   ...args: string[]
 ): string {

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