From c8576b433d8442694e0427301cf061aade0a6f8e Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Thu, 17 Nov 2016 15:32:08 +0100
Subject: per-exchange throttling

---
 src/types.ts  | 2 +-
 src/wallet.ts | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/types.ts b/src/types.ts
index 9de769dfe..b04453767 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -509,7 +509,7 @@ export type PayCoinInfo = Array<{ updatedCoin: CoinRecord, sig: CoinPaySig }>;
 
 
 export namespace Amounts {
-  export const fractionalBase = 1e6;
+  export const fractionalBase = 1e8;
 
   export interface Result {
     amount: AmountJson;
diff --git a/src/wallet.ts b/src/wallet.ts
index 354072130..fc9fd823b 100644
--- a/src/wallet.ts
+++ b/src/wallet.ts
@@ -380,6 +380,7 @@ export class Wallet {
   public cryptoApi: CryptoApi;
 
   private processPreCoinConcurrent = 0;
+  private processPreCoinThrottle: {[url: string]: number} = {};
 
   /**
    * Set of identifiers for running operations.
@@ -728,7 +729,7 @@ export class Wallet {
 
   private async processPreCoin(preCoin: PreCoinRecord,
                                retryDelayMs = 200): Promise<void> {
-    if (this.processPreCoinConcurrent >= 1) {
+    if (this.processPreCoinConcurrent >= 4 || this.processPreCoinThrottle[preCoin.exchangeBaseUrl]) {
       console.log("delaying processPreCoin");
       setTimeout(() => this.processPreCoin(preCoin, retryDelayMs * 2),
                  retryDelayMs);
@@ -793,6 +794,8 @@ export class Wallet {
       let nextRetryDelayMs = Math.min(retryDelayMs * 2, 1000 * 60);
       setTimeout(() => this.processPreCoin(preCoin, nextRetryDelayMs),
                  retryDelayMs);
+      this.processPreCoinThrottle[preCoin.exchangeBaseUrl] = (this.processPreCoinThrottle[preCoin.exchangeBaseUrl] || 0) + 1;
+      setTimeout(() => {this.processPreCoinThrottle[preCoin.exchangeBaseUrl]--; }, retryDelayMs);
     } finally {
       this.processPreCoinConcurrent--;
     }
-- 
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