Add recipients caching

bot/facebook/index.js

@@ -9,6 +9,11 @@ const fbReply = require('claudia-bot-builder/lib/facebook/reply')
 const fbValidate = require('claudia-bot-builder/lib/facebook/validate-integrity')
 const fbTemplate = require('claudia-bot-builder/lib/facebook/format-message')
 
+/**
+ * In-Memory cache for FB graph results
+ */
+const recipients = []
+
 const verifyToken = req => {
   if (req.query['hub.verify_token'] === process.env.FB_VERIFY_TOKEN) {
     return req.query['hub.challenge']
@@ -37,7 +42,11 @@ const fbMessage = async req => {
 const respond = async (req, res) => {
   const message = await fbMessage(req)
   if (message) {
-    const recipient = await FB.api(message.sender)
+    const recipient =
+      recipients[message.sender] || (await FB.api(message.sender))
+
+    // Cache recipients
+    recipients[message.sender] = recipient
 
     const replyMessage = new fbTemplate.Text(
       `${recipient.first_name} said: "${message.text}"`