From 0a88a58c3d1214fe6542af33764c5a3bf0da31dd Mon Sep 17 00:00:00 2001
From: Ace Nassri <anassri@google.com>
Date: Tue, 18 Sep 2018 20:09:10 -0700
Subject: [PATCH] Add print statements to firestore function

---
 functions/firebase/index.js | 16 ++++++++++++----
 functions/node8/index.js    | 13 +++++++++----
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/functions/firebase/index.js b/functions/firebase/index.js
index aaddedca15..15a158c039 100644
--- a/functions/firebase/index.js
+++ b/functions/firebase/index.js
@@ -43,10 +43,18 @@ exports.helloRTDB = (event, callback) => {
 exports.helloFirestore = (event, callback) => {
   const triggerResource = event.resource;
 
-  // We're just going to log the resource string and the
-  // full event to prove that it worked.
-  console.log(`Function triggered by change to: ${triggerResource}`);
-  console.log(JSON.stringify(event));
+  console.log(`Function triggered by event on: ${triggerResource}`);
+  console.log(`Event type: ${event.eventType}`);
+
+  if (event.data.oldValue && Object.keys(event.data.oldValue).length) {
+    console.log(`\nOld value:`);
+    console.log(JSON.stringify(event.data.oldValue, null, 2));
+  }
+
+  if (event.data.value && Object.keys(event.data.value).length) {
+    console.log(`\nNew value:`);
+    console.log(JSON.stringify(event.data.value, null, 2));
+  }
 
   // Don't forget to call the callback.
   callback();
diff --git a/functions/node8/index.js b/functions/node8/index.js
index 70d182a1df..5ab4e86085 100644
--- a/functions/node8/index.js
+++ b/functions/node8/index.js
@@ -152,12 +152,17 @@ exports.helloFirestore = (data, context) => {
   const triggerResource = context.resource;
 
   console.log(`Function triggered by change to: ${triggerResource}`);
+  console.log(`Event type: ${context.eventType}`);
 
-  console.log(`\nOld value:`);
-  console.log(JSON.stringify(data.oldValue, null, 2));
+  if (data.oldValue && Object.keys(data.oldValue).length) {
+    console.log(`\nOld value:`);
+    console.log(JSON.stringify(data.oldValue, null, 2));
+  }
 
-  console.log(`\nNew value:`);
-  console.log(JSON.stringify(data.value, null, 2));
+  if (data.value && Object.keys(data.value).length) {
+    console.log(`\nNew value:`);
+    console.log(JSON.stringify(data.value, null, 2));
+  }
 };
 // [END functions_firebase_firestore_node8]