Refactor date range initialization to fetch earliest timestamp from API and set default values

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

scripts/js/queries.js

@@ -9,10 +9,12 @@
 
 "use strict";
 
-const beginningOfTime = 1_262_304_000; // Jan 01 2010, 00:00 in seconds
+// These values are provided by the API (/info/database).
-const endOfTime = 2_147_483_647; // Jan 19, 2038, 03:14 in seconds
+// We initialize them as null and populate them during page init.
-let from = beginningOfTime;
+let beginningOfTime = null; // seconds since epoch (set from API: info/database.earliest_timestamp)
-let until = endOfTime;
+let endOfTime = null; // seconds since epoch (set to end of today)
+let from = null;
+let until = null;
 
 const dateformat = "MMM Do YYYY, HH:mm";
 
@@ -40,7 +42,30 @@ function getDnssecConfig() {
   });
 }
 
+// Fetch database info (earliest timestamp, sizes, ...) from the API and
+// initialize related globals.
+function getDatabaseInfo() {
+  $.getJSON(document.body.dataset.apiurl + "/info/database", data => {
+    // earliest_timestamp is provided in seconds since epoch
+    beginningOfTime = Number(data.earliest_timestamp_disk);
+    // Round down to nearest 5-minute segment (300 seconds)
+    beginningOfTime = Math.floor(beginningOfTime / 300) * 300;
+
+    // endOfTime should be the end of today (local), in seconds since epoch
+    endOfTime = moment().endOf("day").unix();
+
+    // If from/until were not provided via GET, default them
+    from ??= beginningOfTime;
+    until ??= endOfTime;
+
+    initDateRangePicker();
+  });
+}
+
 function initDateRangePicker() {
+  const minDateMoment = moment.unix(beginningOfTime);
+  const maxDateMoment = moment.unix(endOfTime);
+
   $("#querytime").daterangepicker(
     {
       timePicker: true,
@@ -52,21 +77,24 @@ function initDateRangePicker() {
       ranges: {
         "Last 10 Minutes": [moment().subtract(10, "minutes"), moment()],
         "Last Hour": [moment().subtract(1, "hours"), moment()],
-        Today: [moment().startOf("day"), moment().endOf("day")],
+        Today: [moment().startOf("day"), maxDateMoment],
         Yesterday: [
           moment().subtract(1, "days").startOf("day"),
           moment().subtract(1, "days").endOf("day"),
         ],
-        "Last 7 Days": [moment().subtract(6, "days"), moment().endOf("day")],
+        "Last 7 Days": [moment().subtract(6, "days"), maxDateMoment],
-        "Last 30 Days": [moment().subtract(29, "days"), moment().endOf("day")],
+        "Last 30 Days": [moment().subtract(29, "days"), maxDateMoment],
         "This Month": [moment().startOf("month"), moment().endOf("month")],
         "Last Month": [
           moment().subtract(1, "month").startOf("month"),
           moment().subtract(1, "month").endOf("month"),
         ],
         "This Year": [moment().startOf("year"), moment().endOf("year")],
-        "All Time": [moment(beginningOfTime * 1000), moment(endOfTime * 1000)], // convert to milliseconds since epoch
+        "All Time": [minDateMoment, maxDateMoment],
       },
+      // Don't allow selecting dates outside the database range
+      minDate: minDateMoment,
+      maxDate: maxDateMoment,
       opens: "center",
       showDropdowns: true,
       autoUpdateInput: true,
@@ -510,14 +538,15 @@ $(() => {
   const apiURL = getAPIURL(GETDict);
 
   if ("from" in GETDict) {
-    from = GETDict.from;
+    from = Number(GETDict.from);
   }
 
   if ("until" in GETDict) {
-    until = GETDict.until;
+    until = Number(GETDict.until);
   }
 
-  initDateRangePicker();
+  // Fetch earliest timestamp from API and initialize date picker / table
+  getDatabaseInfo();
 
   table = $("#all-queries").DataTable({
     ajax: {