index.js

@@ -1,11 +1,4 @@
-// Register service worker
-if ('serviceWorker' in navigator) {
-  navigator.serviceWorker.register('./sw.js', {
-    type: 'module'
-  })
-    .then(() => console.log('sw ok'))
-    .catch(() => console.log('sw not ok'))
-}
+const storageType = 'sessionStorage'
 
 var data = {}
 
@@ -14,8 +7,8 @@ const formEl = document.getElementById('search')
 
 // Register event listeners
 formEl.addEventListener('submit', (event) => {
+  event.preventDefault()
   if ('instances' in data && data.instances.length > 0) {
-    event.preventDefault()
     // Random instance
     const n = Math.floor(Math.random() * data.instances.length)
     const instanceURL = data.instances[n]
@@ -28,15 +21,53 @@ formEl.addEventListener('submit', (event) => {
   }
 })
 
-// Fetch data
-await fetch('./data.json')
-  .then(req => req.json())
-  .then(newData => { data = newData })
-  .then(() => {
-    infoEl.textContent = `${data.instances.length} instances`
-  })
-  .catch(err => {
-    console.error(err)
-    infoEl.textContent = err.toString()
-    infoEl.classList.add('error')
-  })
+function locallyGetInstances () {
+  if (!(storageType in window)) return []
+  const item = window[storageType].getItem('instances')
+  try {
+    return JSON.parse(item)
+  } finally {
+    return []
+  }
+}
+
+function locallySetInstances () {
+  if (!(storageType in window)) return
+  if (!('instances' in data)) return
+  if (data.instances.length === 0) return
+  window[storageType].setItem(
+    'instances',
+    JSON.stringify(data.instances)
+  )
+}
+
+async function remotelyGetInstances () {
+  const instances = await fetch('https://searx.space/data/instances.json')
+    .then((req) => req.json())
+    .then((json) => Object.entries(json.instances))
+    .then((entries) => entries.filter(([_url, details]) => {
+      if (details.network_type !== 'normal') return
+      if (details.uptime.uptimeDay !== 100) return
+      return true
+    }))
+    .then((entries) => entries.map(([url]) => url))
+    .catch((err) => {
+      console.error(err)
+      return []
+    })
+  return instances
+}
+
+data.instances = locallyGetInstances()
+const remoteInstances = await remotelyGetInstances()
+if (remoteInstances.length > 0) {
+  data.instances = remoteInstances
+  locallySetInstances()
+}
+
+if (data.instances.length > 0) {
+  infoEl.textContent = `${data.instances.length} instances`
+} else {
+  infoEl.classList.add('error')
+  infoEl.textContent = '0 instances'
+}