Periodically check for newer data in background

src/renderer/renderer.js

@@ -5,7 +5,12 @@ const POEPALETTE_MINISEARCH = new MiniSearch({
     storeFields: ['display_text', 'wiki_url', 'poedb_url', 'ninja_url', 'trade_url', 'tft_url', 'tool_url'],
 })
 
-const init_minisearch = async (league) => {
+let currentLeague
+let dataTimestamp
+
+const initMinisearch = async (league) => {
+    currentLeague = league
+
     const url = `https://d2zmd9bpiyaqin.cloudfront.net/data-${league}.json`
     console.log(`loading search data from ${url}`)
 
@@ -27,6 +32,31 @@ const init_minisearch = async (league) => {
     POEPALETTE_MINISEARCH.addAll(content.data)
     console.timeEnd('search index building')
     console.log(`search index size: ${POEPALETTE_MINISEARCH.termCount}`)
+
+    dataTimestamp = Date.parse(response.headers.get('last-modified'))
+}
+
+window.electronAPI.onLeagueChanged((event, league) => initMinisearch(league))
+
+const checkForDataUpdates = async () => {
+    const url = `https://d2zmd9bpiyaqin.cloudfront.net/data-${currentLeague}.json`
+
+    const response = await fetch(url, { method: 'HEAD' })
+    if (response.status !== 200) {
+        window.electronAPI.panic(
+            `Failed to check for data updates at ${url} (HTTP status ${response.status})`,
+        )
+        return
+    }
+
+    const lastModified = Date.parse(response.headers.get('last-modified'))
+
+    if (lastModified > dataTimestamp) {
+        console.log(`New data available at ${url}, reinitializing search index`)
+        initMinisearch(currentLeague)
+    } else {
+        console.log(`No new data available at ${url}`)
+    }
 }
 
-window.electronAPI.onLeagueChanged((event, league) => init_minisearch(league))
+setInterval(checkForDataUpdates, 15 * 60 * 1000) // check every 15 minutes