first commit

importers/exchanges/kraken.js

@@ -0,0 +1,81 @@
+var _ = require('lodash');
+var moment = require('moment');
+
+var util = require('../../core/util.js');
+var log = require('../../core/log');
+
+var config = util.getConfig();
+
+var dirs = util.dirs();
+
+var Fetcher = require(dirs.exchanges + 'kraken');
+
+util.makeEventEmitter(Fetcher);
+
+var end = false;
+var done = false;
+var from = false;
+
+var lastId = false;
+var prevLastId = false;
+
+var fetcher = new Fetcher(config.watch);
+
+var fetch = () => {
+    fetcher.import = true;
+
+    if (lastId) {
+        var tidAsTimestamp = lastId / 1000000;
+        setTimeout(() => {
+            fetcher.getTrades(tidAsTimestamp, handleFetch)
+        }, 500);
+    }
+    else
+        fetcher.getTrades(from, handleFetch);
+}
+
+var handleFetch = (err, trades) => {
+    if(!err && !trades.length) {
+        console.log('no trades');
+        err = 'No trades';
+    }
+
+    if (err) {
+        log.error(`There was an error importing from Kraken ${err}`);
+        fetcher.emit('done');
+        return fetcher.emit('trades', []);
+    }
+
+    var last = moment.unix(_.last(trades).date).utc();
+    lastId = _.last(trades).tid
+    if(last < from) {
+        log.debug('Skipping data, they are before from date', last.format());
+        return fetch();
+    }
+
+    if  (last > end || lastId === prevLastId) {
+        fetcher.emit('done');
+
+        var endUnix = end.unix();
+        trades = _.filter(
+            trades,
+            t => t.date <= endUnix
+        )
+    }
+
+    prevLastId = lastId
+    fetcher.emit('trades', trades);
+}
+
+module.exports = function (daterange) {
+
+    from = daterange.from.clone();
+    end = daterange.to.clone();
+
+    return {
+        bus: fetcher,
+        fetch: fetch
+    }
+}
+
+