Added useFetch hook. Updated database check.

hooks/useFetch.js

@@ -0,0 +1,39 @@
+import { useState, useEffect } from 'react';
+import { get } from 'lib/web';
+
+export default function useFetch(url, params = {}, options = {}) {
+  const [data, setData] = useState();
+  const [error, setError] = useState();
+  const keys = Object.keys(params)
+    .sort()
+    .map(key => params[key]);
+  const { update = [], onDataLoad = () => {} } = options;
+
+  async function loadData() {
+    try {
+      setError(null);
+      const data = await get(url, params);
+      setData(data);
+      onDataLoad(data);
+    } catch (e) {
+      console.error(e);
+      setError(e);
+    }
+  }
+
+  useEffect(() => {
+    if (url) {
+      const { interval } = options;
+
+      loadData();
+
+      const id = interval ? setInterval(() => loadData(), interval) : null;
+
+      return () => {
+        clearInterval(id);
+      };
+    }
+  }, [url, ...keys, ...update]);
+
+  return { data, error };
+}