first commit

exchange/wrappers/DEBUG_exchange-simulator.js

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+// Fake exchanges: used to test purposes to develop Gekko (works without internet).
+
+const _ = require('lodash');
+const moment = require('moment');
+
+const TREND_DURATION = 1000;
+
+const Trader = function() {
+  this.name = 'Exchange Simulator';
+  this.at = moment().subtract(30, 'minutes');
+
+
+  // fake data
+  this.price = 100;
+  this.trend = 'up';
+  this.tid = 0;
+}
+
+Trader.prototype.getTrades = function(since, cb) {
+  const amount = moment().diff(this.at, 'seconds');
+
+  const trades = _.range(amount).map(() => {
+
+    this.tid++;
+
+    if(this.tid % TREND_DURATION === 0) {
+      if(this.trend === 'up')
+        this.trend = 'down';
+      else
+        this.trend = 'up';
+    }
+
+    if(this.trend === 'up')
+      this.price += Math.random();
+    else
+      this.price -= Math.random();
+
+    return {
+      date: this.at.add(1, 'seconds').unix(),
+      price: this.price,
+      amount: Math.random() * 100,
+      tid: this.tid
+    }
+  });
+
+  console.log(
+    `[EXCHANGE SIMULATOR] emitted ${amount} fake trades, up until ${this.at.format('YYYY-MM-DD HH:mm:ss')}.`
+  );
+
+  cb(null, trades);
+}
+
+Trader.getCapabilities = function () {
+  return {
+    name: 'Exchange Simulator',
+    slug: 'DEBUG_exchange-simulator',
+    currencies: ['USD'],
+    assets: ['BTC', 'BTC'],
+    maxTradesAge: 60,
+    maxHistoryFetch: null,
+    markets: [
+      { pair: ['USD', 'BTC'], minimalOrder: { amount: 5, unit: 'currency' } },
+    ],
+    requires: ['key', 'secret', 'username'],
+    fetchTimespan: 60,
+    tid: 'tid',
+    tradable: false
+  };
+}
+
+module.exports = Trader;
+