1 files changed, 39 insertions, 0 deletions
diff --git a/backend/params.js b/backend/params.js
new file mode 100644
index 0000000..5edf658
--- /dev/null
+++ b/backend/params.js
@@ -0,0 +1,39 @@
+#!/usr/bin/node
+
+const R = require('ramda'),
+  moment = require('moment');
+
+function paramsForHourSample(config) {
+  const requestArgsForRegionStartEnd = R.curry((region, start, end) => [
+    `/shards/${region}/matches`, {
+      'sort': '-createdAt',
+      'filter[gameMode]': R.join(',', config.modes),
+      'filter[createdAt-start]': start.toISOString(),
+      'filter[createdAt-end]': end.toISOString(),
+      'page[limit]': config.matchesPerRequest,
+      'page[offset]': '0',
+    }
+  ]);
+
+  const intervalMinutes = moment.duration(config.interval, config.intervalUnit).as('minutes');
+  const requestsPerMinutePerRegion = Math.floor(config.requestsPerInterval / config.regions.length);
+  const splitDurationMinutes = Math.floor(intervalMinutes / requestsPerMinutePerRegion);
+  const splitMoments = (hour) => R.map(
+    (offsetIndex) => [
+      hour.clone().minutes(offsetIndex * splitDurationMinutes),
+      hour.clone().minutes((offsetIndex + 1) * splitDurationMinutes),
+    ],
+    R.range(0, requestsPerMinutePerRegion),
+  );
+
+  return R.pipe(
+    splitMoments,
+    R.xprod(config.regions),
+    R.map(R.unnest),
+    R.map(R.apply(requestArgsForRegionStartEnd)),
+  );
+}
+
+module.exports = {
+  paramsForHourSample,
+};