Added informative messages on issues related to recent-messages (#3029)

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Minor: Added autocompletion in /whispers for Twitch emotes, Global Bttv/Ffz emotes and emojis. (#2999, #3033)
 - Minor: Received Twitch messages now use the exact same timestamp (obtained from Twitch's server) for every Chatterino user instead of assuming message timestamp on client's side. (#3021)
 - Minor: Received IRC messages use `time` message tag for timestamp if it's available. (#3021)
+- Minor: Added informative messages for recent-messages API's errors. (#3029)
 - Bugfix: Fixed "smiley" emotes being unable to be "Tabbed" with autocompletion, introduced in v2.3.3. (#3010)
 - Dev: Ubuntu packages are now available (#2936)
 

src/providers/twitch/TwitchChannel.cpp

@@ -761,13 +761,16 @@ void TwitchChannel::loadRecentMessages()
                    .arg(baseURL)
                    .arg(getSettings()->twitchMessageHistoryLimit);
 
+    auto weak = weakOf<Channel>(this);
+
     NetworkRequest(url)
-        .onSuccess([weak = weakOf<Channel>(this)](auto result) -> Outcome {
+        .onSuccess([this, weak](NetworkResult result) -> Outcome {
             auto shared = weak.lock();
             if (!shared)
                 return Failure;
 
-            auto messages = parseRecentMessages(result.parseJson(), shared);
+            auto root = result.parseJson();
+            auto messages = parseRecentMessages(root, shared);
 
             auto &handler = IrcMessageHandler::instance();
 
@@ -801,13 +804,38 @@ void TwitchChannel::loadRecentMessages()
                 }
             }
 
-            postToThread(
-                [shared, messages = std::move(allBuiltMessages)]() mutable {
-                    shared->addMessagesAtStart(messages);
-                });
+            postToThread([this, shared, root,
+                          messages = std::move(allBuiltMessages)]() mutable {
+                shared->addMessagesAtStart(messages);
+
+                // Notify user about a possible gap in logs if it returned some messages
+                // but isn't currently joined to a channel
+                if (QString errorCode = root.value("error_code").toString();
+                    !errorCode.isEmpty())
+                {
+                    qCDebug(chatterinoTwitch)
+                        << QString("rm error_code=%1, channel=%2")
+                               .arg(errorCode, this->getName());
+                    if (errorCode == "channel_not_joined" && !messages.empty())
+                    {
+                        shared->addMessage(makeSystemMessage(
+                            "Message history service recovering, there may be "
+                            "gaps in the message history."));
+                    }
+                }
+            });
 
             return Success;
         })
+        .onError([weak](NetworkResult result) {
+            auto shared = weak.lock();
+            if (!shared)
+                return;
+
+            shared->addMessage(makeSystemMessage(
+                QString("Message history service unavailable (Error %1)")
+                    .arg(result.status())));
+        })
         .execute();
 }