more OrderBook performance optimizations

OrderBook: emit 'model' event only after last transaction in closed ledger
run AutobridgeCalculator only once in a ledger

src/autobridgecalculator.js

@@ -2,7 +2,6 @@
 
 const _ = require('lodash');
 const assert = require('assert');
-const UInt160 = require('./uint160').UInt160;
 const Amount = require('./amount').Amount;
 const Utils = require('./orderbookutils');
 
@@ -38,15 +37,39 @@ AutobridgeCalculator.NULL_AMOUNT = Utils.normalizeAmount('0');
  * @return {Array}
  */
 
-AutobridgeCalculator.prototype.calculate = function() {
-  let legOnePointer = 0;
-  let legTwoPointer = 0;
+AutobridgeCalculator.prototype.calculate = function(callback) {
+  const legOnePointer = 0;
+  const legTwoPointer = 0;
 
   const offersAutobridged = [];
 
   this.clearOwnerFundsLeftover();
 
+  this._calculateInternal(legOnePointer, legTwoPointer, offersAutobridged,
+    callback);
+};
+
+AutobridgeCalculator.prototype._calculateInternal = function(
+  legOnePointer_, legTwoPointer_, offersAutobridged, callback
+) {
+
+  let legOnePointer = legOnePointer_;
+  let legTwoPointer = legTwoPointer_;
+
+  const startTime = Date.now();
+
   while (this.legOneOffers[legOnePointer] && this.legTwoOffers[legTwoPointer]) {
+    // manually implement cooperative multitasking that yields after 30ms
+    // of execution so user's browser stays responsive
+    const lasted = (Date.now() - startTime);
+    if (lasted > 30) {
+      setTimeout(() => {
+        this._calculateInternal(legOnePointer, legTwoPointer, offersAutobridged,
+          callback);
+      }, 0);
+      return;
+    }
+
     const legOneOffer = this.legOneOffers[legOnePointer];
     const legTwoOffer = this.legTwoOffers[legTwoPointer];
     const leftoverFunds = this.getLeftoverOwnerFunds(legOneOffer.Account);
@@ -103,7 +126,7 @@ AutobridgeCalculator.prototype.calculate = function() {
     offersAutobridged.push(autobridgedOffer);
   }
 
-  return offersAutobridged;
+  callback(offersAutobridged);
 };
 
 /**
@@ -308,7 +331,8 @@ function(takerGets, takerPays) {
 
   autobridgedOffer.autobridged = true;
 
-  autobridgedOffer.BookDirectory = Utils.convertOfferQualityToHexFromText(autobridgedOffer.quality);
+  autobridgedOffer.BookDirectory =
+    Utils.convertOfferQualityToHexFromText(autobridgedOffer.quality);
   autobridgedOffer.qualityHex = autobridgedOffer.BookDirectory;
 
   return autobridgedOffer;
@@ -432,7 +456,7 @@ function(legOneOffer, takerGets) {
   const legOneQuality = Utils.getOfferQuality(legOneOffer, this._currencyGets);
 
   legOneOffer.TakerGets = takerGets.to_text();
-  legOneOffer.TakerPays = takerGets.multiply(legOneQuality);
+  legOneOffer.TakerPays = takerGets.multiply(legOneQuality).to_json();
 };
 
 module.exports = AutobridgeCalculator;

src/orderbook.js

@@ -74,29 +74,30 @@ function OrderBook(remote,
   this._gotOffersFromLegOne = false;
   this._gotOffersFromLegTwo = false;
 
+  this._waitingForOffers = false;
+  this._offersModifiedAt = 0;
+  this._transactionsLeft = 0;
+  this._calculatorRunning = false;
+
+
   this.sortOffers = this._currencyGets.has_interest() ?
     _sortOffers.bind(this) : _sortOffersQuick;
 
-  this.notifyDirectOffersChanged =
-    _.debounce(
-      this.notifyDirectOffersChangedInternal,
-      OrderBook.NOTIFY_TIMEOUT,
-      {maxWait: OrderBook.NOTIFY_MAXWAIT});
-
   this._isAutobridgeable = !this._currencyGets.is_native()
     && !this._currencyPays.is_native();
 
-  this._autobridgeThrottleTimeMultiplier = 1;
-  this.createDebouncedOffersWrapper();
-
   function computeAutobridgedOffersWrapperOne() {
+    if (!self._gotOffersFromLegOne) {
       self._gotOffersFromLegOne = true;
-    self.computeAutobridgedOffersThrottled();
+      self.computeAutobridgedOffersWrapper();
+    }
   }
 
   function computeAutobridgedOffersWrapperTwo() {
+    if (!self._gotOffersFromLegTwo) {
       self._gotOffersFromLegTwo = true;
-    self.computeAutobridgedOffersThrottled();
+      self.computeAutobridgedOffersWrapper();
+    }
   }
 
   function onDisconnect() {
@@ -125,8 +126,12 @@ function OrderBook(remote,
     });
   }
 
-  function updateFundedAmountsWrapper(transaction) {
-    self.updateFundedAmounts(transaction);
+  function onTransactionWrapper(transaction) {
+    self.onTransaction(transaction);
+  }
+
+  function onLedgerClosedWrapper(message) {
+    self.onLedgerClosed(message);
   }
 
   function listenersModified(action, event) {
@@ -139,7 +144,8 @@ function OrderBook(remote,
             self._shouldSubscribe = true;
             self.subscribe();
 
-            self._remote.on('transaction', updateFundedAmountsWrapper);
+            self._remote.on('transaction', onTransactionWrapper);
+            self._remote.on('ledger_closed', onLedgerClosedWrapper);
             self._remote.once('disconnect', onDisconnect);
 
             if (self._isAutobridgeable) {
@@ -168,7 +174,8 @@ function OrderBook(remote,
   this.on('unsubscribe', function() {
     self.resetCache();
 
-    self._remote.removeListener('transaction', updateFundedAmountsWrapper);
+    self._remote.removeListener('transaction', onTransactionWrapper);
+    self._remote.removeListener('ledger_closed', onLedgerClosedWrapper);
     self._remote.removeListener('disconnect', onDisconnect);
 
     self._gotOffersFromLegOne = false;
@@ -199,16 +206,6 @@ OrderBook.EVENTS = [
 
 OrderBook.DEFAULT_TRANSFER_RATE = Amount.from_json(1000000000);
 
-OrderBook.NOTIFY_TIMEOUT = 100;
-
-OrderBook.NOTIFY_MAXWAIT = 250;
-
-OrderBook.AUTOBRIDGE_CALCULATE_THROTTLE_TIME = 1000;
-
-OrderBook.AUTOBRIDGE_CALCULATE_DEBOUNCE_TIME = 250;
-
-OrderBook.AUTOBRIDGE_CALCULATE_DEBOUNCE_MAXWAIT = 500;
-
 OrderBook.ZERO_NATIVE_AMOUNT = Amount.from_json('0');
 
 OrderBook.ZERO_NORMALIZED_AMOUNT = OrderBookUtils.normalizeAmount('0');
@@ -345,6 +342,8 @@ OrderBook.prototype.requestOffers = function(callback = function() {},
     log.info('requesting offers', this._key);
   }
 
+  this._synchronized = false;
+
   if (this._isAutobridgeable && !internal) {
     this._gotOffersFromLegOne = false;
     this._gotOffersFromLegTwo = false;
@@ -359,9 +358,12 @@ OrderBook.prototype.requestOffers = function(callback = function() {},
       return;
     }
 
+    self._waitingForOffers = false;
+
     if (!Array.isArray(res.offers)) {
       // XXX What now?
       callback(new Error('Invalid response'));
+      self.emit('model', []);
       return;
     }
 
@@ -370,7 +372,12 @@ OrderBook.prototype.requestOffers = function(callback = function() {},
     }
     self.setOffers(res.offers);
     self._synchronized = true;
-    self.notifyDirectOffersChanged();
+
+    if (self._isAutobridgeable) {
+      self.computeAutobridgedOffersWrapper();
+    } else {
+      self.emit('model', self._offers);
+    }
 
     callback(null, self._offers);
   }
@@ -381,9 +388,12 @@ OrderBook.prototype.requestOffers = function(callback = function() {},
       log.info('failed to request offers', self._key, err);
     }
 
+    self._waitingForOffers = false;
     callback(err);
   }
 
+  this._waitingForOffers = true;
+
   const request = this._remote.requestBookOffers(this.toJSON());
   request.once('success', handleOffers);
   request.once('error', handleError);
@@ -479,18 +489,6 @@ OrderBook.prototype.subscribeTransactions = function(callback) {
   return request;
 };
 
-/**
- * Handles notifying listeners that direct offers have changed. For autobridged
- * books, an additional merge step is also performed
- */
-
-OrderBook.prototype.notifyDirectOffersChangedInternal = function() {
-  if (this._isAutobridgeable) {
-    this.mergeDirectAndAutobridgedBooks();
-  } else {
-    this.emit('model', this._offers);
-  }
-};
 
 /**
  * Reset cached owner's funds, offer counts, and offer sums
@@ -828,6 +826,32 @@ OrderBook.prototype.isBalanceChangeNode = function(node) {
   return true;
 };
 
+OrderBook.prototype._canRunAutobridgeCalc = function(): boolean {
+  return !this._calculatorRunning;
+}
+
+OrderBook.prototype.onTransaction = function(transaction) {
+  this.updateFundedAmounts(transaction);
+
+
+  if (--this._transactionsLeft === 0 && !this._waitingForOffers) {
+    const lastClosedLedger = this._remote.getLedgerSequence() - 1;
+    if (this._isAutobridgeable) {
+      if (this._canRunAutobridgeCalc()) {
+        if (this._legOneBook._offersModifiedAt === lastClosedLedger ||
+            this._legTwoBook._offersModifiedAt === lastClosedLedger
+        ) {
+          this.computeAutobridgedOffersWrapper();
+        } else if (this._offersModifiedAt === lastClosedLedger) {
+          this.mergeDirectAndAutobridgedBooks();
+        }
+      }
+    } else if (this._offersModifiedAt === lastClosedLedger) {
+      this.emit('model', this._offers);
+    }
+  }
+}
+
 /**
  * Updates funded amounts/balances using modified balance nodes
  *
@@ -929,6 +953,16 @@ OrderBook.prototype.updateOwnerOffersFundedAmount = function(account) {
   });
 };
 
+
+OrderBook.prototype.onLedgerClosed = function(message) {
+  if (!message || (message && !_.isNumber(message.txn_count)) ||
+    !this._subscribed || this._destroyed || this._waitingForOffers
+  ) {
+    return;
+  }
+  this._transactionsLeft = message.txn_count;
+}
+
 /**
  * Notify orderbook of a relevant transaction
  *
@@ -1029,7 +1063,7 @@ OrderBook.prototype.notify = function(transaction) {
 
   this.emit('transaction', transaction);
 
-  this.notifyDirectOffersChanged();
+  this._offersModifiedAt = this._remote.getLedgerSequence() - 1;
 
   if (!takerGetsTotal.is_zero()) {
     this.emit('trade', takerPaysTotal, takerGetsTotal);
@@ -1312,15 +1346,13 @@ OrderBook.prototype.is_valid = function() {
  * IOU:XRP and XRP:IOU books
  */
 
-OrderBook.prototype.computeAutobridgedOffers = function() {
+OrderBook.prototype.computeAutobridgedOffers = function(callback = function() {}
+) {
   assert(!this._currencyGets.is_native() && !this._currencyPays.is_native(),
     'Autobridging is only for IOU:IOU orderbooks');
 
-  if (this._destroyed) {
-    return;
-  }
   
-  if (!this._gotOffersFromLegOne || !this._gotOffersFromLegTwo) {
+  if (this._destroyed) {
     return;
   }
 
@@ -1333,35 +1365,28 @@ OrderBook.prototype.computeAutobridgedOffers = function() {
     this._issuerPays
   );
 
-  this._offersAutobridged = autobridgeCalculator.calculate();
+  const lastClosedLedger = this._remote.getLedgerSequence() - 1;
+
+  autobridgeCalculator.calculate((autobridgedOffers) => {
+    this._offersAutobridged = autobridgedOffers;
+    callback();
+  });
 };
 
 OrderBook.prototype.computeAutobridgedOffersWrapper = function() {
-  var startTime = Date.now();
-  this.computeAutobridgedOffers();
-  this.mergeDirectAndAutobridgedBooks();
-  var lasted = (Date.now() - startTime);
-  
-  const newMult =
-    ((lasted * 2 / OrderBook.AUTOBRIDGE_CALCULATE_THROTTLE_TIME) << 0) + 1;
-  if (newMult !== this._autobridgeThrottleTimeMultiplier) {
-    this._autobridgeThrottleTimeMultiplier = newMult;
-    this.createDebouncedOffersWrapper();
+  if (!this._gotOffersFromLegOne || !this._gotOffersFromLegTwo ||
+      !this._synchronized || this._destroyed || this._calculatorRunning
+  ) {
+    return;
   }
-}
-
-OrderBook.prototype.createDebouncedOffersWrapper = function() {
-  const m = this._autobridgeThrottleTimeMultiplier;
-  this.computeAutobridgedOffersThrottled = 
-    _.debounce(
-      _.throttle(
-        this.computeAutobridgedOffersWrapper,
-        OrderBook.AUTOBRIDGE_CALCULATE_THROTTLE_TIME * m,
-        {leading: true, trailing: true}),
-      OrderBook.AUTOBRIDGE_CALCULATE_DEBOUNCE_TIME,
-      {maxWait: OrderBook.AUTOBRIDGE_CALCULATE_DEBOUNCE_MAXWAIT});
-}
 
+  this._calculatorRunning = true;
+  const startTime = Date.now();
+  this.computeAutobridgedOffers(() => {
+    this.mergeDirectAndAutobridgedBooks();
+    this._calculatorRunning = false;
+  });
+};
 
 function _sortOffers(a, b) {
   const aQuality = OrderBookUtils.getOfferQuality(a, this._currencyGets);

test/orderbook-autobridge-test.js

@@ -16,6 +16,7 @@ describe('OrderBook Autobridging', function() {
   function createRemote() {
     const remote = new Remote();
 
+    remote._ledger_current_index = 32570;
     remote.isConnected = function() {
       return true;
     };
@@ -37,7 +38,7 @@ describe('OrderBook Autobridging', function() {
     assert.deepEqual(book._legTwoBook._currencyPays.to_hex(), Currency.from_json('XRP').to_hex());
   });
 
-  it('Compute autobridged offers', function() {
+  it('Compute autobridged offers', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -56,8 +57,7 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '17.07639524223001');
@@ -67,9 +67,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[0].taker_pays_funded, '58.61727326122974');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - leg one partially funded', function() {
+  });
+
+  it('Compute autobridged offers - leg one partially funded', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -90,17 +94,20 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '7.273651248813431');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '24.96789265329184');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - leg two partially funded', function() {
+  });
+
+  it('Compute autobridged offers - leg two partially funded', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -121,17 +128,20 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '10');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '34.32649132449533');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - leg two transfer rate', function() {
+  });
+
+  it('Compute autobridged offers - leg two transfer rate', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -152,15 +162,18 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '9.980039920159681');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '34.25797537722665');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - taker funds < leg two in', function() {
+  });
+
+  it('Compute autobridged offers - taker funds < leg two in', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -185,17 +198,20 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '108.6682345172846');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '373.019921005');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - leg one partially funded - owners equal', function() {
+  });
+
+  it('Compute autobridged offers - leg one partially funded - owners equal', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -218,17 +234,20 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '17.07639524223001');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '58.61727326122974');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - leg one partially funded - owners equal - leg two in > leg one out', function() {
+  });
+
+  it('Compute autobridged offers - leg one partially funded - owners equal - leg two in > leg one out', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -254,17 +273,20 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '108.6682345172846');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '373.0199210049999');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - leg one consumes leg two fully', function() {
+  });
+
+  it('Compute autobridged offers - leg one consumes leg two fully', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -283,8 +305,7 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 2);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '17.07639524223001');
@@ -296,9 +317,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[1].TakerPays.value, '314.4026477437702');
 
       assert(book._offersAutobridged[1].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - leg two consumes first leg one offer fully', function() {
+  });
+
+  it('Compute autobridged offers - leg two consumes first leg one offer fully', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -321,8 +346,7 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 2);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '108.6682345172846');
@@ -334,9 +358,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[1].TakerPays.value, '213.1791399943838');
 
       assert(book._offersAutobridged[1].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - owners equal', function() {
+  });
+
+  it('Compute autobridged offers - owners equal', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -360,8 +388,7 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 2);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '17.07639524223001');
@@ -373,9 +400,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[1].TakerPays.value, '24.96789265329184');
 
       assert(book._offersAutobridged[1].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - owners equal - leg one overfunded', function() {
+  });
+
+  it('Compute autobridged offers - owners equal - leg one overfunded', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -400,8 +431,7 @@ describe('OrderBook Autobridging', function() {
     book._legTwoBook.setOffers(legTwoOffers);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 2);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '17.07639524223001');
@@ -413,9 +443,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[1].TakerPays.value, '314.4026477437702');
 
       assert(book._offersAutobridged[1].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - TakerPays < Quality * TakerGets', function() {
+  });
+
+  it('Compute autobridged offers - TakerPays < Quality * TakerGets', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -458,17 +492,20 @@ describe('OrderBook Autobridging', function() {
     ]);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '75');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '75');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - update funded amount', function() {
+  });
+
+  it('Compute autobridged offers - update funded amount', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -534,8 +571,7 @@ describe('OrderBook Autobridging', function() {
     ]);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 3);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '90');
@@ -552,9 +588,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[2].TakerPays.value, '80');
 
       assert(book._offersAutobridged[2].autobridged);
+
+      done();  
     });
 
-  it('Compute autobridged offers - update funded amount - owners equal', function() {
+  });
+
+  it('Compute autobridged offers - update funded amount - owners equal', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -620,8 +660,7 @@ describe('OrderBook Autobridging', function() {
     ]);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 3);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '90');
@@ -638,9 +677,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[2].TakerPays.value, '100');
 
       assert(book._offersAutobridged[2].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - update funded amount - first two owners equal', function() {
+  });
+
+  it('Compute autobridged offers - update funded amount - first two owners equal', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -717,8 +760,7 @@ describe('OrderBook Autobridging', function() {
     ]);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 4);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '90');
@@ -740,9 +782,13 @@ describe('OrderBook Autobridging', function() {
       assert.strictEqual(book._offersAutobridged[3].TakerPays.value, '80');
 
       assert(book._offersAutobridged[3].autobridged);
+
+      done();
     });
 
-  it('Compute autobridged offers - unfunded offer - owners equal', function() {
+  });
+
+  it('Compute autobridged offers - unfunded offer - owners equal', function(done) {
     const book = createRemote().createOrderBook({
       currency_gets: 'EUR',
       issuer_gets: addresses.ISSUER,
@@ -785,13 +831,16 @@ describe('OrderBook Autobridging', function() {
     ]);
 
     book._gotOffersFromLegOne = book._gotOffersFromLegTwo = true;
-    book.computeAutobridgedOffers();
-
+    book.computeAutobridgedOffers(() => {
       assert.strictEqual(book._offersAutobridged.length, 1);
 
       assert.strictEqual(book._offersAutobridged[0].TakerGets.value, '75');
       assert.strictEqual(book._offersAutobridged[0].TakerPays.value, '75');
 
       assert(book._offersAutobridged[0].autobridged);
+
+      done();
+    });
+
   });
 });

test/orderbook-test.js

@@ -15,7 +15,7 @@ describe('OrderBook', function() {
 
   function createRemote() {
     const remote = new Remote();
-
+    remote._ledger_current_index = 32570;
     remote.isConnected = function() {
       return true;
     };
@@ -1613,9 +1613,15 @@ describe('OrderBook', function() {
     const offer2 = fixtures.transactionWithCreatedOffer();
     const offer3 = fixtures.transactionWithCreatedOffer();
 
+    remote.emit('ledger_closed', {txn_count: 3});
+
     book.notify(offer);
+    remote.emit('transaction', offer);
     book.notify(offer2);
+    remote.emit('transaction', offer2);
     book.notify(offer3);
+    remote.emit('transaction', offer3);
+
 
     assert.strictEqual(numTransactionEvents, 3);
     assert.strictEqual(numOfferAddedEvents, 3);
@@ -1706,7 +1712,10 @@ describe('OrderBook', function() {
 
     const message = fixtures.transactionWithDeletedOffer();
 
+    remote.emit('ledger_closed', {txn_count: 1});
+
     book.notify(message);
+    remote.emit('transaction', message);
 
     assert.strictEqual(numTransactionEvents, 1);
     assert.strictEqual(numTradeEvents, 1);
@@ -1865,7 +1874,10 @@ describe('OrderBook', function() {
 
     const message = fixtures.transactionWithModifiedOffer();
 
+    remote.emit('ledger_closed', {txn_count: 1});
+
     book.notify(message);
+    remote.emit('transaction', message);
 
     assert.strictEqual(numTransactionEvents, 1);
     assert.strictEqual(numTradeEvents, 1);

test/remote-test.js

@@ -671,6 +671,7 @@ describe('Remote', function() {
      function() {
     const message = require('./fixtures/transaction-offercreate');
     let i = 0;
+    remote._ledger_current_index = 32570;
     const orderbook = remote.createOrderBook({
       currency_gets: 'USD',
       issuer_gets: 'rJy64aCJLP3vf8o3WPKn4iQKtfpjh6voAR',