error when subscription is lost (#122)

Author: nplasterer

library/src/main/java/org/xmtp/android/library/Conversations.kt

@@ -354,29 +354,44 @@ data class Conversations(
     }
 
     fun streamAllMessages(): Flow<DecodedMessage> = flow {
-        val topics: MutableList<String> =
-            mutableListOf(
+        while (true) {
+            val topics = mutableListOf(
                 Topic.userInvite(client.address).description,
                 Topic.userIntro(client.address).description
             )
-        for (conversation in list()) {
-            topics.add(conversation.topic)
-        }
-        client.subscribe(topics).collect { envelope ->
-            var conversation = conversationsByTopic[envelope.contentTopic]
-            var decoded: DecodedMessage? = null
-            if (conversation != null) {
-                decoded = conversation.decodeOrNull(envelope)
-            } else if (envelope.contentTopic.startsWith("/xmtp/0/invite-")) {
-                conversation = fromInvite(envelope = envelope)
-                conversationsByTopic[conversation.topic] = conversation
-            } else if (envelope.contentTopic.startsWith("/xmtp/0/intro-")) {
-                conversation = fromIntro(envelope = envelope)
-                conversationsByTopic[conversation.topic] = conversation
-                decoded = conversation.decodeOrNull(envelope)
+
+            for (conversation in list()) {
+                topics.add(conversation.topic)
             }
-            if (decoded != null) {
-                emit(decoded)
+
+            try {
+                client.subscribe(topics = topics).collect { envelope ->
+                    when {
+                        conversationsByTopic.containsKey(envelope.contentTopic) -> {
+                            val conversation = conversationsByTopic[envelope.contentTopic]
+                            val decoded = conversation?.decode(envelope)
+                            decoded?.let { emit(it) }
+                        }
+
+                        envelope.contentTopic.startsWith("/xmtp/0/invite-") -> {
+                            val conversation = fromInvite(envelope)
+                            conversationsByTopic[conversation.topic] = conversation
+                            // Break so we can resubscribe with the new conversation
+                            return@collect
+                        }
+
+                        envelope.contentTopic.startsWith("/xmtp/0/intro-") -> {
+                            val conversation = fromIntro(envelope)
+                            conversationsByTopic[conversation.topic] = conversation
+                            val decoded = conversation.decode(envelope)
+                            emit(decoded)
+                            // Break so we can resubscribe with the new conversation
+                            return@collect
+                        }
+                    }
+                }
+            } catch (error: Exception) {
+                throw error
             }
         }
     }