feat: handle release notes fetching with no internet

When release notes (either Northstar or Viper) fetching fails,
if cache contains data, we display it even if it's outdated; if
cache is empty, we display an error message in place of release
notes.

2 files changed, 37 insertions, 5 deletions

diff --git a/src/app/launcher.js b/src/app/launcher.js
index fbeb703..e1dbbe0 100644
--- a/src/app/launcher.js
+++ b/src/app/launcher.js
@@ -26,13 +26,17 @@ function page(page) {
 function formatRelease(notes) {
 	let content = "";
 
-	for (let release of notes) {
-		if (release.prerelease) {continue}
-		content += "# " + release.name + "\n\n"	+ release.body + "\n\n\n";
+	if (notes.length === 1) {
+		content = notes[0];
+	} else {
+		for (let release of notes) {
+			if (release.prerelease) {continue}
+			content += "# " + release.name + "\n\n"	+ release.body + "\n\n\n";
+		}
+	
+		content = content.replaceAll(/\@(\S+)/g, `<a href="https://github.com/$1">@$1</a>`);
 	}
 
-	content = content.replaceAll(/\@(\S+)/g, `<a href="https://github.com/$1">@$1</a>`);
-
 	return markdown(content, {
 		breaks: true
 	});
diff --git a/src/extras/requests.js b/src/extras/requests.js
index 16b1330..c609da3 100644
--- a/src/extras/requests.js
+++ b/src/extras/requests.js
@@ -103,6 +103,20 @@ async function getNsReleaseNotes() {
                     _saveCache(cache);
                     resolve( cache[NORTHSTAR_RELEASE_NOTES_KEY]["body"] );
                 });
+            })
+            
+            // When GitHub cannot be reached (when user doesn't have Internet 
+            // access for instance), we return latest cache content even if 
+            // it's not up-to-date, or display an error message if cache
+            // is empty.
+            .on('error', () => {
+                if ( cache[NORTHSTAR_RELEASE_NOTES_KEY] ) {
+                    console.warn("Couldn't fetch Northstar release notes, returning data from cache.");
+                    resolve( cache[NORTHSTAR_RELEASE_NOTES_KEY]["body"] );
+                } else {
+                    console.error("Couldn't fetch Northstar release notes, cache is empty.");
+                    resolve( ["Couldn't fetch Northstar release notes.\nTry again later!"] );
+                }
             });
         }
     });
@@ -140,6 +154,20 @@ async function getVpReleaseNotes() {
                     _saveCache(cache);
                     resolve( cache[VIPER_RELEASE_NOTES_KEY]["body"] );
                 });
+            })
+
+            // When GitHub cannot be reached (when user doesn't have Internet 
+            // access for instance), we return latest cache content even if 
+            // it's not up-to-date, or display an error message if cache
+            // is empty.
+            .on('error', () => {
+                if ( cache[VIPER_RELEASE_NOTES_KEY] ) {
+                    console.warn("Couldn't fetch Viper release notes, returning data from cache.");
+                    resolve( cache[VIPER_RELEASE_NOTES_KEY]["body"] );
+                } else {
+                    console.error("Couldn't fetch Viper release notes, cache is empty.");
+                    resolve( ["Couldn't fetch Viper release notes.\nTry again later!"] );
+                }
             });
         }
     });