make geoip lookup optional

server/amplitude.js

@@ -1,9 +1,12 @@
 const crypto = require('crypto');
-const geoip = require('fxa-geodb')();
 const fetch = require('node-fetch');
 const config = require('./config');
 const pkg = require('../package.json');
 
+const geoip = config.ip_db
+  ? require('fxa-geodb')({ dbPath: config.ip_db })
+  : () => ({});
+
 const HOUR = 1000 * 60 * 60;
 
 function truncateToHour(timestamp) {

server/config.js

@@ -149,6 +149,11 @@ const conf = convict({
     format: String,
     default: '',
     env: 'SURVEY_URL'
+  },
+  ip_db: {
+    format: String,
+    default: '',
+    env: 'IP_DB'
   }
 });