first commit

exchange/exchangeChecker.js

@@ -0,0 +1,104 @@
+const _ = require('lodash');
+const fs = require('fs');
+const moment = require('moment');
+const errors = require('./exchangeErrors');
+
+const Checker = function() {
+  _.bindAll(this);
+}
+
+Checker.prototype.getExchangeCapabilities = function(slug) {
+  if(!fs.existsSync(__dirname + '/wrappers/' + slug + '.js'))
+    throw new errors.ExchangeError(`Gekko does not know the exchange "${slug}"`);
+
+  return require('./wrappers/' + slug).getCapabilities();
+}
+
+// check if the exchange is configured correctly for monitoring
+Checker.prototype.cantMonitor = function(conf) {
+  var slug = conf.exchange.toLowerCase();
+  var exchange = this.getExchangeCapabilities(slug);
+
+  if(!exchange)
+    return 'Gekko does not support the exchange ' + slug;
+
+  var name = exchange.name;
+
+  if('monitorError' in exchange)
+    return 'At this moment Gekko can\'t monitor ' + name +  ', find out more info here:\n\n' + exchange.monitorError;
+
+  var name = exchange.name;
+
+  if(!_.includes(exchange.currencies, conf.currency))
+    return 'Gekko only supports the currencies [ ' + exchange.currencies.join(', ') + ' ] at ' + name + ' (not ' + conf.currency + ')';
+
+  if(!_.includes(exchange.assets, conf.asset))
+    return 'Gekko only supports the assets [ ' + exchange.assets.join(', ') + ' ]  at ' + name + ' (not ' + conf.asset + ')';
+
+  var pair = _.find(exchange.markets, function(p) {
+    return p.pair[0] === conf.currency && p.pair[1] === conf.asset;
+  });
+
+  if(!pair)
+    return 'Gekko does not support this currency/assets pair at ' + name;
+
+  // everything is okay
+  return false;
+}
+
+// check if the exchange is configured correctly for fetching
+// full history
+Checker.prototype.cantFetchFullHistory = function(conf) {
+  var slug = conf.exchange.toLowerCase();
+  var exchange = this.getExchangeCapabilities(slug);
+
+  if(this.cantMonitor(conf))
+    return this.cantMonitor(conf);
+
+  var name = exchange.name;
+
+  if(!exchange.providesFullHistory)
+    return 'The exchange ' + name + ' does not provide full history (or Gekko doesn\'t support importing it)';
+
+  if ("exchangeMaxHistoryAge" in exchange) {
+    if (moment(config.importer.daterange.from) < moment().subtract(exchange.exchangeMaxHistoryAge, "days")) {
+      return 'Unsupported date from! ' + exchange.name + ' supports history of max ' + exchange.exchangeMaxHistoryAge + ' days..';
+    }
+  }
+}
+
+// check if the exchange if configured correctly for real trading
+Checker.prototype.cantTrade = function(conf) {
+  var cantMonitor = this.cantMonitor(conf);
+  if(cantMonitor)
+    return cantMonitor;
+
+  var slug = conf.exchange.toLowerCase();
+  var exchange = this.getExchangeCapabilities(slug);
+  var name = exchange.name;
+
+  if(!exchange.tradable)
+    return 'At this moment Gekko can\'t trade at ' + name + '.';
+
+  if(conf.key === 'your-key')
+    return '"your-key" is not a valid API key';
+
+  if(conf.secret === 'your-secret')
+    return '"your-secret" is not a valid API secret';
+
+  var error = false;
+  _.each(exchange.requires, function(req) {
+    if(!conf[req])
+      error = name + ' requires "' + req + '" to be set in the config';
+  }, this);
+
+  return error;
+}
+
+Checker.prototype.settings = function(conf) {
+  var slug = conf.exchange.toLowerCase();
+  return this.getExchangeCapabilities(slug);
+
+}
+
+module.exports = new Checker();