Move app graphs graphite query to backend

src/graphs.js

@@ -0,0 +1,57 @@
+'use strict';
+
+exports = module.exports = {
+    getByAppId
+};
+
+const assert = require('assert'),
+    BoxError = require('./boxerror.js'),
+    safe = require('safetydance'),
+    superagent = require('superagent'),
+    debug = require('debug')('box:graphs');
+
+const GRAPHITE_RENDER_URL = 'http://127.0.0.1:8417/graphite-web/render';
+
+async function getByAppId(appId, fromMinutes, noNullPoints) {
+    assert.strictEqual(typeof appId, 'string');
+    assert.strictEqual(typeof fromMinutes, 'number');
+    assert.strictEqual(typeof noNullPoints, 'boolean');
+
+    const timeBucketSize = fromMinutes > (24 * 60) ? (6*60) : 5;
+
+    debug(`getByAppId: ${appId} from ${fromMinutes}`);
+
+    const memoryQuery = {
+        target: `summarize(sum(collectd.localhost.table-${appId}-memory.gauge-rss, collectd.localhost.table-${appId}-memory.gauge-swap), "${timeBucketSize}min", "avg")`,
+        format: 'json',
+        from: `-${fromMinutes}min`,
+        until: 'now'
+    };
+    if (noNullPoints) memoryQuery.noNullPoints = true;
+
+    const [memoryError, memoryResponse] = await safe(superagent.get(GRAPHITE_RENDER_URL)
+        .query(memoryQuery)
+        .timeout(30 * 1000)
+        .ok(() => true));
+
+    if (memoryError) throw new BoxError(BoxError.NETWORK_ERROR, memoryError.message);
+    if (memoryResponse.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `Unknown error: ${memoryError.message}`);
+
+    const diskQuery = {
+        target: `summarize(collectd.localhost.du-${appId}.capacity-usage, "${timeBucketSize}min", "avg")`,
+        format: 'json',
+        from: `-${fromMinutes}min`,
+        until: 'now'
+    };
+    if (noNullPoints) diskQuery.noNullPoints = true;
+
+    const [diskError, diskResponse] = await safe(superagent.get(GRAPHITE_RENDER_URL)
+        .query(diskQuery)
+        .timeout(30 * 1000)
+        .ok(() => true));
+
+    if (diskError) throw new BoxError(BoxError.NETWORK_ERROR, diskError.message);
+    if (diskResponse.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `Unknown error: ${diskError.message}`);
+
+    return { memory: memoryResponse.body[0], disk: diskResponse.body[0] };
+}