1 files changed, 33 insertions, 0 deletions
diff --git a/app/assets/javascripts/observability/utils.js b/app/assets/javascripts/observability/utils.js
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+++ b/app/assets/javascripts/observability/utils.js
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+/**
+ * Return the data range for the given time period
+ * Accepted values are numbers followed by the unit 'm', 'h', 'd', e.g. '5m', '3h', '7d'
+ *
+ *  e.g. timePerdio: '5m'
+ *      returns: { min: Date(_now - 5min_), max: Date(_now_) }
+ *
+ * @param {String} timePeriod The 'period' string
+ * @returns {{max: Date, min: Date}|{}} where max, min are Date objects representing the period range
+ *  It returns {} if the period filter does not represent any range (invalid range, etc)
+ */
+export const periodToDate = (timePeriod) => {
+  const maxMs = Date.now();
+  let minMs;
+  const periodValue = parseInt(timePeriod.slice(0, -1), 10);
+  if (Number.isNaN(periodValue) || periodValue <= 0) return {};
+
+  const unit = timePeriod[timePeriod.length - 1];
+  switch (unit) {
+    case 'm':
+      minMs = periodValue * 60 * 1000;
+      break;
+    case 'h':
+      minMs = periodValue * 60 * 1000 * 60;
+      break;
+    case 'd':
+      minMs = periodValue * 60 * 1000 * 60 * 24;
+      break;
+    default:
+      return {};
+  }
+  return { min: new Date(maxMs - minMs), max: new Date(maxMs) };
+};