From ab70ac38fdf7974fe316daa76a3fbd077cc5314c Mon Sep 17 00:00:00 2001
From: Benjamin Goering <bengoering@gmail.com>
Date: Wed, 1 Mar 2017 16:07:25 +0800
Subject: [PATCH] If fail to addremov best comment tag, show user an error

---
 client/coral-embed-stream/src/Comment.js | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/client/coral-embed-stream/src/Comment.js b/client/coral-embed-stream/src/Comment.js
index 1e4802470..7f3265f5f 100644
--- a/client/coral-embed-stream/src/Comment.js
+++ b/client/coral-embed-stream/src/Comment.js
@@ -113,14 +113,26 @@ class Comment extends React.Component {
     const flag = getActionSummary('FlagActionSummary', comment);
     const dontagree = getActionSummary('DontAgreeActionSummary', comment);
 
-    const addBestTag = () => addCommentTag({
+    // call a function, and if it errors, call addNotification('error', ...) (e.g. to show user a snackbar)
+    const notifyOnError = (fn, errorToMessage) => async () => {
+      if (typeof errorToMessage !== 'function') {errorToMessage = (error) => error.message;}
+      try {
+        return await fn();
+      } catch (error) {
+        addNotification('error', errorToMessage(error));
+        throw error;
+      }
+    };
+
+    const addBestTag = notifyOnError(() => addCommentTag({
       id: comment.id,
       tag: BEST_TAG,
-    });
-    const removeBestTag = () => removeCommentTag({
+    }), () => 'Failed to tag comment as best');
+
+    const removeBestTag = notifyOnError(() => removeCommentTag({
       id: comment.id,
       tag: BEST_TAG,
-    });
+    }), () => 'Failed to remove best comment tag');
 
     return (
       <div