From 78cefecaada9360fe79c3fdb037d76beb8f54760 Mon Sep 17 00:00:00 2001
From: Maurice Parker <mo@vincode.io>
Date: Mon, 4 May 2020 17:48:53 -0500
Subject: [PATCH] Make sure we are only going after a given URL once

---
 Shared/Images/WebFeedIconDownloader.swift | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Shared/Images/WebFeedIconDownloader.swift b/Shared/Images/WebFeedIconDownloader.swift
index 25fae6d27..930afe8a3 100644
--- a/Shared/Images/WebFeedIconDownloader.swift
+++ b/Shared/Images/WebFeedIconDownloader.swift
@@ -119,7 +119,13 @@ public final class WebFeedIconDownloader {
 		}
 		
 		if let components = URLComponents(string: feed.url), let feedProvider = FeedProviderManager.shared.best(for: components) {
+			guard !urlsInProgress.contains(feed.url) else {
+				return nil
+			}
+			urlsInProgress.insert(feed.url)
+			
 			feedProvider.iconURL(components) { result in
+				self.urlsInProgress.remove(feed.url)
 				switch result {
 				case .success(let feedProviderURL):
 					self.feedURLToIconURLCache[feed.url] = feedProviderURL