From be77ee284a819f7932831bd85e88c47c655addb2 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Mon, 7 Sep 2020 15:54:22 +0530
Subject: dynamic pay request timeout

---
 packages/taler-integrationtests/src/harness.ts   | 24 ++++++++++++++++++++++++
 packages/taler-wallet-core/src/operations/pay.ts |  8 +++++---
 packages/taler-wallet-core/src/util/time.ts      |  7 +++++++
 3 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/packages/taler-integrationtests/src/harness.ts b/packages/taler-integrationtests/src/harness.ts
index 90a618e17..620b89e76 100644
--- a/packages/taler-integrationtests/src/harness.ts
+++ b/packages/taler-integrationtests/src/harness.ts
@@ -1215,6 +1215,30 @@ export namespace MerchantPrivateApi {
       talerRefundUri: resp.data.taler_refund_uri,
     };
   }
+
+  export async function createTippingReserve(merchantService: MerchantServiceInterface,
+    
+    req: CreateMerchantTippingReserveRequest,
+  ): Promise<CreateMerchantTippingReserveConfirmation> {}
+}
+
+export interface CreateMerchantTippingReserveRequest {
+  // Amount that the merchant promises to put into the reserve
+  initial_balance: AmountString;
+
+  // Exchange the merchant intends to use for tipping
+  exchange_url: string;
+
+  // Desired wire method, for example "iban" or "x-taler-bank"
+  wire_method: string;
+}
+
+export interface CreateMerchantTippingReserveConfirmation {
+  // Public key identifying the reserve
+  reserve_pub: string;
+
+  // Wire account of the exchange where to transfer the funds
+  payto_url: string;
 }
 
 export class MerchantService implements MerchantServiceInterface {
diff --git a/packages/taler-wallet-core/src/operations/pay.ts b/packages/taler-wallet-core/src/operations/pay.ts
index 6452a11ae..50f863e48 100644
--- a/packages/taler-wallet-core/src/operations/pay.ts
+++ b/packages/taler-wallet-core/src/operations/pay.ts
@@ -68,6 +68,8 @@ import {
   durationMax,
   durationMin,
   isTimestampExpired,
+  durationMul,
+  durationAdd,
 } from "../util/time";
 import { strcmp, canonicalJson } from "../util/helpers";
 import {
@@ -614,8 +616,8 @@ function getProposalRequestTimeout(proposal: ProposalRecord): Duration {
   );
 }
 
-function getPurchaseRequestTimeout(purchase: PurchaseRecord): Duration {
-  return { d_ms: 5000 };
+function getPayRequestTimeout(purchase: PurchaseRecord): Duration {
+  return durationMul({ d_ms: 5000 }, 1 + purchase.payCoinSelection.coinPubs.length / 20);
 }
 
 async function processDownloadProposalImpl(
@@ -936,7 +938,7 @@ export async function submitPay(
 
     const resp = await ws.runSequentialized([EXCHANGE_COINS_LOCK], () =>
       ws.http.postJson(payUrl, reqBody, {
-        timeout: getPurchaseRequestTimeout(purchase),
+        timeout: getPayRequestTimeout(purchase),
       }),
     );
 
diff --git a/packages/taler-wallet-core/src/util/time.ts b/packages/taler-wallet-core/src/util/time.ts
index 5a5e9c608..be63aef6b 100644
--- a/packages/taler-wallet-core/src/util/time.ts
+++ b/packages/taler-wallet-core/src/util/time.ts
@@ -151,6 +151,13 @@ export function durationMul(d: Duration, n: number): Duration {
   return { d_ms: Math.round(d.d_ms * n) };
 }
 
+export function durationAdd(d1: Duration, d2: Duration): Duration {
+  if (d1.d_ms === "forever" || d2.d_ms === "forever") {
+    return { d_ms: "forever" };
+  }
+  return { d_ms: d1.d_ms + d2.d_ms };
+}
+
 export function timestampCmp(t1: Timestamp, t2: Timestamp): number {
   if (t1.t_ms === "never") {
     if (t2.t_ms === "never") {
-- 
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