feat(conversations): create conversation list with last message

bindings_ffi/src/mls.rs

@@ -947,6 +947,26 @@ impl FfiConversations {
         Ok(convo_list)
     }
 
+    pub async fn list_conversations(
+        &self,
+    ) -> Result<Vec<Arc<FfiConversationListItem>>, GenericError> {
+        let inner = self.inner_client.as_ref();
+        let convo_list: Vec<Arc<FfiConversationListItem>> = inner
+            .list_conversations()?
+            .into_iter()
+            .map(|conversation_item| {
+                Arc::new(FfiConversationListItem {
+                    conversation: conversation_item.group.into(),
+                    last_message: conversation_item
+                        .last_message
+                        .map(|stored_message| stored_message.into()),
+                })
+            })
+            .collect();
+
+        Ok(convo_list)
+    }
+
     pub async fn list_groups(
         &self,
         opts: FfiListConversationsOptions,
@@ -1142,6 +1162,13 @@ pub struct FfiConversation {
     inner: MlsGroup<RustXmtpClient>,
 }
 
+#[derive(uniffi::Object)]
+#[allow(unused_variables, dead_code)]
+pub struct FfiConversationListItem {
+    conversation: FfiConversation,
+    last_message: Option<FfiMessage>,
+}
+
 impl From<MlsGroup<RustXmtpClient>> for FfiConversation {
     fn from(mls_group: MlsGroup<RustXmtpClient>) -> FfiConversation {
         FfiConversation { inner: mls_group }
@@ -2667,6 +2694,170 @@ mod tests {
         assert!(stream_messages.is_closed());
     }
 
+    #[tokio::test(flavor = "multi_thread", worker_threads = 5)]
+    async fn test_list_conversations_last_message() {
+        // Step 1: Setup test client Alix and bo
+        let alix = new_test_client().await;
+        let bo = new_test_client().await;
+
+        // Step 2: Create a group and add messages
+        let alix_conversations = alix.conversations();
+
+        // Create a group
+        let group = alix_conversations
+            .create_group(
+                vec![bo.account_address.clone()],
+                FfiCreateGroupOptions::default(),
+            )
+            .await
+            .unwrap();
+
+        // Add messages to the group
+        group
+            .send("First message".as_bytes().to_vec())
+            .await
+            .unwrap();
+        group
+            .send("Second message".as_bytes().to_vec())
+            .await
+            .unwrap();
+
+        // Step 3: Synchronize conversations
+        alix_conversations
+            .sync_all_conversations(None)
+            .await
+            .unwrap();
+
+        // Step 4: List conversations and verify
+        let conversations = alix_conversations.list_conversations().await.unwrap();
+
+        // Ensure the group is included
+        assert_eq!(conversations.len(), 1, "Alix should have exactly 1 group");
+
+        let last_message = conversations[0].last_message.as_ref().unwrap();
+        assert_eq!(
+            last_message.content,
+            "Second message".as_bytes().to_vec(),
+            "Last message content should be the most recent"
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 5)]
+    async fn test_list_conversations_no_messages() {
+        // Step 1: Setup test clients Alix and Bo
+        let alix = new_test_client().await;
+        let bo = new_test_client().await;
+
+        let alix_conversations = alix.conversations();
+
+        // Step 2: Create a group with Bo but do not send messages
+        alix_conversations
+            .create_group(
+                vec![bo.account_address.clone()],
+                FfiCreateGroupOptions::default(),
+            )
+            .await
+            .unwrap();
+
+        // Step 3: Synchronize conversations
+        alix_conversations
+            .sync_all_conversations(None)
+            .await
+            .unwrap();
+
+        // Step 4: List conversations and verify
+        let conversations = alix_conversations.list_conversations().await.unwrap();
+
+        // Ensure the group is included
+        assert_eq!(conversations.len(), 1, "Alix should have exactly 1 group");
+
+        // Verify that the last_message is None
+        assert!(
+            conversations[0].last_message.is_none(),
+            "Last message should be None since no messages were sent"
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 5)]
+    async fn test_conversation_list_ordering() {
+        // Step 1: Setup test client
+        let client = new_test_client().await;
+        let conversations_api = client.conversations();
+
+        // Step 2: Create Group A
+        let group_a = conversations_api
+            .create_group(vec![], FfiCreateGroupOptions::default())
+            .await
+            .unwrap();
+
+        // Step 3: Create Group B
+        let group_b = conversations_api
+            .create_group(vec![], FfiCreateGroupOptions::default())
+            .await
+            .unwrap();
+
+        // Step 4: Send a message to Group A
+        group_a
+            .send("Message to Group A".as_bytes().to_vec())
+            .await
+            .unwrap();
+
+        // Step 5: Create Group C
+        let group_c = conversations_api
+            .create_group(vec![], FfiCreateGroupOptions::default())
+            .await
+            .unwrap();
+
+        // Step 6: Synchronize conversations
+        conversations_api
+            .sync_all_conversations(None)
+            .await
+            .unwrap();
+
+        // Step 7: Fetch the conversation list
+        let conversations = conversations_api.list_conversations().await.unwrap();
+
+        // Step 8: Assert the correct order of conversations
+        assert_eq!(
+            conversations.len(),
+            3,
+            "There should be exactly 3 conversations"
+        );
+
+        // Verify the order: Group C, Group A, Group B
+        assert_eq!(
+            conversations[0].conversation.inner.group_id, group_c.inner.group_id,
+            "Group C should be the first conversation"
+        );
+        assert_eq!(
+            conversations[1].conversation.inner.group_id, group_a.inner.group_id,
+            "Group A should be the second conversation"
+        );
+        assert_eq!(
+            conversations[2].conversation.inner.group_id, group_b.inner.group_id,
+            "Group B should be the third conversation"
+        );
+
+        // Verify the last_message field for Group A and None for others
+        assert!(
+            conversations[0].last_message.is_none(),
+            "Group C should have no messages"
+        );
+        assert!(
+            conversations[1].last_message.is_some(),
+            "Group A should have a last message"
+        );
+        assert_eq!(
+            conversations[1].last_message.as_ref().unwrap().content,
+            "Message to Group A".as_bytes().to_vec(),
+            "Group A's last message content should match"
+        );
+        assert!(
+            conversations[2].last_message.is_none(),
+            "Group B should have no messages"
+        );
+    }
+
     #[tokio::test(flavor = "multi_thread", worker_threads = 5)]
     async fn test_can_sync_all_groups() {
         let alix = new_test_client().await;

xmtp_mls/Cargo.toml

@@ -107,6 +107,7 @@ diesel = { workspace = true, features = [
     "r2d2",
     "returning_clauses_for_sqlite_3_35",
     "sqlite",
+    "32-column-tables"
 ] }
 dyn-clone.workspace = true
 libsqlite3-sys = { workspace = true }

xmtp_mls/migrations/2024-12-20-143210_create_conversation_list_view/down.sql

@@ -0,0 +1 @@
+DROP VIEW IF EXISTS conversation_list;

xmtp_mls/migrations/2024-12-20-143210_create_conversation_list_view/up.sql

@@ -0,0 +1,47 @@
+CREATE VIEW conversation_list AS
+WITH ranked_messages AS (
+    SELECT
+        gm.group_id,
+        gm.id AS message_id,
+        gm.decrypted_message_bytes,
+        gm.sent_at_ns,
+        gm.kind AS message_kind,
+        gm.sender_installation_id,
+        gm.sender_inbox_id,
+        gm.delivery_status,
+        gm.content_type,
+        gm.version_major,
+        gm.version_minor,
+        gm.authority_id,
+        ROW_NUMBER() OVER (PARTITION BY gm.group_id ORDER BY gm.sent_at_ns DESC) AS row_num
+    FROM
+        group_messages gm
+    WHERE
+        gm.kind = 1
+)
+SELECT
+    g.id AS id,
+    g.created_at_ns,
+    g.membership_state,
+    g.installations_last_checked,
+    g.added_by_inbox_id,
+    g.welcome_id,
+    g.dm_inbox_id,
+    g.rotated_at_ns,
+    g.conversation_type,
+    rm.message_id,
+    rm.decrypted_message_bytes,
+    rm.sent_at_ns,
+    rm.message_kind,
+    rm.sender_installation_id,
+    rm.sender_inbox_id,
+    rm.delivery_status,
+    rm.content_type,
+    rm.version_major,
+    rm.version_minor,
+    rm.authority_id
+FROM
+    groups g
+        LEFT JOIN ranked_messages rm
+                  ON g.id = rm.group_id AND rm.row_num = 1
+ORDER BY COALESCE(rm.sent_at_ns, g.created_at_ns) DESC;

xmtp_mls/src/client.rs

@@ -33,6 +33,7 @@ use xmtp_proto::xmtp::mls::api::v1::{
 #[cfg(any(test, feature = "test-utils"))]
 use crate::groups::device_sync::WorkerHandle;
 
+use crate::groups::ConversationListItem;
 use crate::{
     api::ApiClientWrapper,
     groups::{
@@ -669,6 +670,43 @@ where
             .collect())
     }
 
+    pub fn list_conversations(&self) -> Result<Vec<ConversationListItem<Self>>, ClientError> {
+        Ok(self
+            .store()
+            .conn()?
+            .fetch_conversation_list()?
+            .into_iter()
+            .map(|conversation_item| {
+                let message = conversation_item.message_id.and_then(|message_id| {
+                    // Only construct StoredGroupMessage if all fields are Some
+                    Some(StoredGroupMessage {
+                        id: message_id,
+                        group_id: conversation_item.id.clone(),
+                        decrypted_message_bytes: conversation_item.decrypted_message_bytes?,
+                        sent_at_ns: conversation_item.sent_at_ns?,
+                        sender_installation_id: conversation_item.sender_installation_id?,
+                        sender_inbox_id: conversation_item.sender_inbox_id?,
+                        kind: conversation_item.kind?,
+                        delivery_status: conversation_item.delivery_status?,
+                        content_type: conversation_item.content_type?,
+                        version_major: conversation_item.version_major?,
+                        version_minor: conversation_item.version_minor?,
+                        authority_id: conversation_item.authority_id?,
+                    })
+                });
+
+                ConversationListItem {
+                    group: MlsGroup::new(
+                        self.clone(),
+                        conversation_item.id,
+                        conversation_item.created_at_ns,
+                    ),
+                    last_message: message,
+                }
+            })
+            .collect())
+    }
+
     /// Upload a Key Package to the network and publish the signed identity update
     /// from the provided SignatureRequest
     pub async fn register_identity(

xmtp_mls/src/groups/mod.rs

@@ -276,6 +276,11 @@ pub struct MlsGroup<C> {
     mutex: Arc<Mutex<()>>,
 }
 
+pub struct ConversationListItem<C> {
+    pub group: MlsGroup<C>,
+    pub last_message: Option<StoredGroupMessage>,
+}
+
 #[derive(Default)]
 pub struct GroupMetadataOptions {
     pub name: Option<String>,