fix: fetch preapproval only once

docs/wallet-integration-guide/examples/scripts/05-preapproval.ts

@@ -77,7 +77,22 @@ logger.info('Successfully registered the preapproval.')
 
 // --- TEST FETCH
 
-logger.info('Fetching for preapproval status')
+const start = performance.now()
+const fetchOnceStatus = await sdk.amulet.preapproval.fetchQuick(bob.partyId)
+const end = performance.now()
+
+const duration = end - start
+if (duration < 1000) {
+    logger.info(
+        `Success! The operation was fast (${duration.toFixed(2)} ms) and fetchOnce status is ${fetchOnceStatus}.`
+    )
+} else {
+    logger.warn(
+        `Warning: Operation took longer than 1 second (${(duration / 1000).toFixed(2)} s).`
+    )
+}
+
+logger.info('Fetching for preapproval status with retry')
 
 const fetchedPreapprovalStatus = await sdk.amulet.preapproval.fetchStatus(
     bob.partyId
@@ -129,6 +144,23 @@ logger.info({ aliceAmuletValue, bobAmuletValue }, 'Result:')
 
 logger.info('Renewing preapproval...')
 
+const start2 = performance.now()
+const fetchOnceStatusWithPreapproval = await sdk.amulet.preapproval.fetchQuick(
+    bob.partyId
+)
+const end2 = performance.now()
+
+const duration2 = end2 - start2
+if (duration < 1000) {
+    logger.info(
+        `Success! The operation was fast (${duration2.toFixed(2)} ms) and fetchOnce status is ${fetchOnceStatusWithPreapproval}.`
+    )
+} else {
+    logger.warn(
+        `Warning: Operation took longer than 1 second (${duration2.toFixed(2)} s).`
+    )
+}
+
 const newExpiresAt = new Date(fetchedPreapprovalStatus!.expiresAt)
 newExpiresAt.setDate(newExpiresAt.getDate() + 2)
 

sdk/wallet-sdk/src/wallet/namespace/amulet/preapproval.ts

@@ -158,6 +158,25 @@ export class PreapprovalNamespace {
         })
     }
 
+    /**
+     * Fetch TransferPreapproval from ScanProxy. This does NOT retry or wait.
+     * If you want additional logic for create/renew/cancel events and retry use fetchStatus instead
+     * @param receiverParty Receiver party id
+     * @returns Resolves with the preapproval or null, if not found
+     */
+    public async fetchQuick(receiverParty: PartyId) {
+        try {
+            return await this.ctx.amuletService.getTransferPreApprovalByParty(
+                receiverParty
+            )
+        } catch (e) {
+            if (isNotFoundError(e)) {
+                this.logger.info('Preapproval is no longer visible')
+                return null
+            }
+        }
+    }
+
     /**
      * Wait for Scan Proxy to show a receiver's TransferPreapproval, or for its CID to change after renewal,
      * or for it to disappear after cancel.