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subscriptions.rs
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subscriptions.rs
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use std::{collections::HashMap, sync::Arc};
use futures::{FutureExt, Stream, StreamExt};
use prost::Message;
use tokio::{sync::oneshot, task::JoinHandle};
use tokio_stream::wrappers::errors::BroadcastStreamRecvError;
use xmtp_proto::xmtp::mls::api::v1::WelcomeMessage;
use crate::{
api::GroupFilter,
client::{extract_welcome_message, ClientError},
groups::{extract_group_id, GroupError, MlsGroup},
retry::Retry,
retry_async,
storage::{group::StoredGroup, group_message::StoredGroupMessage},
Client, XmtpApi,
};
#[derive(Debug)]
/// Wrapper around a [`tokio::task::JoinHandle`] but with a oneshot receiver
/// which allows waiting for a `with_callback` stream fn to be ready for stream items.
pub struct StreamHandle<T> {
pub handle: JoinHandle<T>,
start: Option<oneshot::Receiver<()>>,
}
/// Events local to this client
/// are broadcast across all senders/receivers of streams
#[derive(Clone, Debug)]
pub(crate) enum LocalEvents {
// a new group was created
NewGroup(MlsGroup),
}
impl<T> StreamHandle<T> {
/// Waits for the stream to be fully spawned
pub async fn wait_for_ready(&mut self) {
if let Some(s) = self.start.take() {
let _ = s.await;
}
}
}
impl<T> From<StreamHandle<T>> for JoinHandle<T> {
fn from(stream: StreamHandle<T>) -> JoinHandle<T> {
stream.handle
}
}
#[derive(Clone, Debug)]
pub(crate) struct MessagesStreamInfo {
pub convo_created_at_ns: i64,
pub cursor: u64,
}
impl From<StoredGroup> for (Vec<u8>, MessagesStreamInfo) {
fn from(group: StoredGroup) -> (Vec<u8>, MessagesStreamInfo) {
(
group.id,
MessagesStreamInfo {
convo_created_at_ns: group.created_at_ns,
cursor: 0,
},
)
}
}
impl<ApiClient> Client<ApiClient>
where
ApiClient: XmtpApi + 'static,
{
async fn process_streamed_welcome(
&self,
welcome: WelcomeMessage,
) -> Result<MlsGroup, ClientError> {
let welcome_v1 = extract_welcome_message(welcome)?;
let creation_result = retry_async!(
Retry::default(),
(async {
let welcome_v1 = welcome_v1.clone();
self.context
.store
.transaction_async(|provider| async move {
MlsGroup::create_from_encrypted_welcome(
self,
&provider,
welcome_v1.hpke_public_key.as_slice(),
welcome_v1.data,
welcome_v1.id as i64,
)
.await
})
.await
})
);
if let Some(err) = creation_result.as_ref().err() {
let conn = self.context.store.conn()?;
let result = conn.find_group_by_welcome_id(welcome_v1.id as i64);
match result {
Ok(Some(group)) => {
log::info!(
"Loading existing group for welcome_id: {:?}",
group.welcome_id
);
return Ok(MlsGroup::new(
self.context.clone(),
group.id,
group.created_at_ns,
));
}
Ok(None) => return Err(ClientError::Generic(err.to_string())),
Err(e) => return Err(ClientError::Generic(e.to_string())),
}
}
Ok(creation_result?)
}
pub async fn process_streamed_welcome_message(
&self,
envelope_bytes: Vec<u8>,
) -> Result<MlsGroup, ClientError> {
let envelope = WelcomeMessage::decode(envelope_bytes.as_slice())
.map_err(|e| ClientError::Generic(e.to_string()))?;
let welcome = self.process_streamed_welcome(envelope).await?;
Ok(welcome)
}
pub async fn stream_conversations(
&self,
) -> Result<impl Stream<Item = MlsGroup> + '_, ClientError> {
let event_queue =
tokio_stream::wrappers::BroadcastStream::new(self.local_events.subscribe());
let event_queue = event_queue.filter_map(|event| async move {
match event {
Ok(LocalEvents::NewGroup(g)) => Some(g),
Err(BroadcastStreamRecvError::Lagged(missed)) => {
log::warn!("Missed {missed} messages due to local event queue lagging");
None
}
}
});
let installation_key = self.installation_public_key();
let id_cursor = 0;
let subscription = self
.api_client
.subscribe_welcome_messages(installation_key, Some(id_cursor))
.await?;
let stream = subscription
.map(|welcome| async {
log::info!("Received conversation streaming payload");
self.process_streamed_welcome(welcome?).await
})
.filter_map(|res| async {
match res.await {
Ok(group) => Some(group),
Err(err) => {
log::error!("Error processing stream entry for conversation: {:?}", err);
None
}
}
});
Ok(futures::stream::select(stream, event_queue))
}
#[tracing::instrument(skip(self, group_id_to_info))]
pub(crate) async fn stream_messages(
&self,
group_id_to_info: Arc<HashMap<Vec<u8>, MessagesStreamInfo>>,
) -> Result<impl Stream<Item = StoredGroupMessage> + '_, ClientError>
where
ApiClient: 'static,
{
let filters: Vec<GroupFilter> = group_id_to_info
.iter()
.map(|(group_id, info)| GroupFilter::new(group_id.clone(), Some(info.cursor)))
.collect();
let messages_subscription = self.api_client.subscribe_group_messages(filters).await?;
let stream = messages_subscription
.map(move |res| {
let group_info = group_id_to_info.clone();
async move {
match res {
Ok(envelope) => {
log::info!("Received message streaming payload");
let group_id = extract_group_id(&envelope)?;
log::info!("Extracted group id {}", hex::encode(&group_id));
let stream_info = group_info.get(&group_id).ok_or(
ClientError::StreamInconsistency(
"Received message for a non-subscribed group".to_string(),
),
)?;
let mls_group = MlsGroup::new(
self.context.clone(),
group_id,
stream_info.convo_created_at_ns,
);
mls_group.process_stream_entry(envelope, self).await
}
Err(err) => Err(GroupError::Api(err)),
}
}
})
.filter_map(|res| async {
match res.await {
Ok(Some(message)) => Some(message),
Ok(None) => {
log::info!("Skipped message streaming payload");
None
}
Err(err) => {
log::error!("Error processing stream entry: {:?}", err);
None
}
}
});
Ok(stream)
}
}
impl<ApiClient> Client<ApiClient>
where
ApiClient: XmtpApi + 'static,
{
pub fn stream_conversations_with_callback(
client: Arc<Client<ApiClient>>,
mut convo_callback: impl FnMut(MlsGroup) + Send + 'static,
) -> StreamHandle<Result<(), ClientError>> {
let (tx, rx) = oneshot::channel();
let handle = tokio::spawn(async move {
let stream = client.stream_conversations().await?;
futures::pin_mut!(stream);
let _ = tx.send(());
while let Some(convo) = stream.next().await {
convo_callback(convo)
}
Ok(())
});
StreamHandle {
start: Some(rx),
handle,
}
}
pub(crate) fn stream_messages_with_callback(
client: Arc<Client<ApiClient>>,
group_id_to_info: HashMap<Vec<u8>, MessagesStreamInfo>,
mut callback: impl FnMut(StoredGroupMessage) + Send + 'static,
) -> StreamHandle<Result<(), ClientError>> {
let (tx, rx) = oneshot::channel();
let client = client.clone();
let handle = tokio::spawn(async move {
let stream = Self::stream_messages(&client, group_id_to_info.into()).await?;
let _ = tx.send(());
futures::pin_mut!(stream);
while let Some(message) = stream.next().await {
callback(message)
}
Ok(())
});
StreamHandle {
start: Some(rx),
handle,
}
}
pub async fn stream_all_messages(
&self,
) -> Result<impl Stream<Item = Result<StoredGroupMessage, ClientError>> + '_, ClientError> {
self.sync_welcomes().await?;
let mut group_id_to_info = self
.store()
.conn()?
.find_groups(None, None, None, None)?
.into_iter()
.map(Into::into)
.collect::<HashMap<Vec<u8>, MessagesStreamInfo>>();
let stream = async_stream::stream! {
let messages_stream = self
.stream_messages(Arc::new(group_id_to_info.clone()))
.await?;
futures::pin_mut!(messages_stream);
let convo_stream = self.stream_conversations().await?;
futures::pin_mut!(convo_stream);
let mut extra_messages = Vec::new();
loop {
tokio::select! {
// biased enforces an order to select!. If a message and a group are both ready
// at the same time, `biased` mode will process the message before the new
// group.
biased;
messages = futures::future::ready(&mut extra_messages), if !extra_messages.is_empty() => {
for message in messages.drain(0..) {
yield Ok(message);
}
},
Some(message) = messages_stream.next() => {
// an error can only mean the receiver has been dropped or closed so we're
// safe to end the stream
yield Ok(message);
}
Some(new_group) = convo_stream.next() => {
if group_id_to_info.contains_key(&new_group.group_id) {
continue;
}
for info in group_id_to_info.values_mut() {
info.cursor = 0;
}
group_id_to_info.insert(
new_group.group_id,
MessagesStreamInfo {
convo_created_at_ns: new_group.created_at_ns,
cursor: 1, // For the new group, stream all messages since the group was created
},
);
let new_messages_stream = match self.stream_messages(Arc::new(group_id_to_info.clone())).await {
Ok(stream) => stream,
Err(e) => {
log::error!("{}", e);
break;
}
};
log::debug!("switching streams");
// attempt to drain all ready messages from existing stream
while let Some(Some(message)) = messages_stream.next().now_or_never() {
extra_messages.push(message);
}
messages_stream.set(new_messages_stream);
},
}
}
};
Ok(stream)
}
pub fn stream_all_messages_with_callback(
client: Arc<Client<ApiClient>>,
mut callback: impl FnMut(StoredGroupMessage) + Send + Sync + 'static,
) -> StreamHandle<Result<(), ClientError>> {
let (tx, rx) = oneshot::channel();
let handle = tokio::spawn(async move {
let stream = Self::stream_all_messages(&client).await?;
let _ = tx.send(());
futures::pin_mut!(stream);
while let Some(message) = stream.next().await {
match message {
Ok(m) => callback(m),
Err(m) => log::error!("error during stream all messages {}", m),
}
}
Ok(())
});
StreamHandle {
start: Some(rx),
handle,
}
}
}
#[cfg(test)]
mod tests {
use crate::utils::test::{Delivery, TestClient};
use crate::{
builder::ClientBuilder, groups::GroupMetadataOptions,
storage::group_message::StoredGroupMessage, Client,
};
use futures::StreamExt;
use parking_lot::Mutex;
use std::sync::{
atomic::{AtomicU64, Ordering},
Arc,
};
use xmtp_cryptography::utils::generate_local_wallet;
#[tokio::test(flavor = "current_thread")]
async fn test_stream_welcomes() {
let alice = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let bob = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let alice_bob_group = alice
.create_group(None, GroupMetadataOptions::default())
.unwrap();
// FIXME:insipx we run into an issue where the reqwest::post().send() request
// blocks the executor and we cannot progress the runtime if we dont `tokio::spawn` this.
// A solution might be to use `hyper` instead, and implement a custom connection pool with
// `deadpool`. This is a bit more work but shouldn't be too complicated since
// we're only using `post` requests. It would be nice for all streams to work
// w/o spawning a separate task.
let (tx, rx) = tokio::sync::mpsc::unbounded_channel();
let mut stream = tokio_stream::wrappers::UnboundedReceiverStream::new(rx);
let bob_ptr = bob.clone();
tokio::spawn(async move {
let bob_stream = bob_ptr.stream_conversations().await.unwrap();
futures::pin_mut!(bob_stream);
while let Some(item) = bob_stream.next().await {
let _ = tx.send(item);
}
});
let group_id = alice_bob_group.group_id.clone();
alice_bob_group
.add_members_by_inbox_id(&alice, vec![bob.inbox_id()])
.await
.unwrap();
let bob_received_groups = stream.next().await.unwrap();
assert_eq!(bob_received_groups.group_id, group_id);
}
#[tokio::test(flavor = "multi_thread", worker_threads = 10)]
async fn test_stream_messages() {
let alice = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let bob = ClientBuilder::new_test_client(&generate_local_wallet()).await;
let alice_group = alice
.create_group(None, GroupMetadataOptions::default())
.unwrap();
// let mut bob_stream = bob.stream_conversations().await.unwrap();
alice_group
.add_members_by_inbox_id(&alice, vec![bob.inbox_id()])
.await
.unwrap();
let bob_group = bob.sync_welcomes().await.unwrap();
let bob_group = bob_group.first().unwrap();
let notify = Delivery::new(None);
let notify_ptr = notify.clone();
let (tx, rx) = tokio::sync::mpsc::unbounded_channel();
tokio::spawn(async move {
let stream = alice_group.stream(&alice).await.unwrap();
futures::pin_mut!(stream);
while let Some(item) = stream.next().await {
let _ = tx.send(item);
notify_ptr.notify_one();
}
});
let mut stream = tokio_stream::wrappers::UnboundedReceiverStream::new(rx);
bob_group.send_message(b"hello", &bob).await.unwrap();
notify.wait_for_delivery().await.unwrap();
let message = stream.next().await.unwrap();
assert_eq!(message.decrypted_message_bytes, b"hello");
bob_group.send_message(b"hello2", &bob).await.unwrap();
notify.wait_for_delivery().await.unwrap();
let message = stream.next().await.unwrap();
assert_eq!(message.decrypted_message_bytes, b"hello2");
// assert_eq!(bob_received_groups.group_id, alice_bob_group.group_id);
}
#[tokio::test(flavor = "multi_thread", worker_threads = 10)]
async fn test_stream_all_messages_unchanging_group_list() {
let alix = ClientBuilder::new_test_client(&generate_local_wallet()).await;
let bo = ClientBuilder::new_test_client(&generate_local_wallet()).await;
let caro = ClientBuilder::new_test_client(&generate_local_wallet()).await;
let alix_group = alix
.create_group(None, GroupMetadataOptions::default())
.unwrap();
alix_group
.add_members_by_inbox_id(&alix, vec![caro.inbox_id()])
.await
.unwrap();
let bo_group = bo
.create_group(None, GroupMetadataOptions::default())
.unwrap();
bo_group
.add_members_by_inbox_id(&bo, vec![caro.inbox_id()])
.await
.unwrap();
tokio::time::sleep(std::time::Duration::from_millis(100)).await;
let messages: Arc<Mutex<Vec<StoredGroupMessage>>> = Arc::new(Mutex::new(Vec::new()));
let messages_clone = messages.clone();
let notify = Delivery::new(None);
let notify_pointer = notify.clone();
let mut handle = Client::<TestClient>::stream_all_messages_with_callback(
Arc::new(caro),
move |message| {
(*messages_clone.lock()).push(message);
notify_pointer.notify_one();
},
);
handle.wait_for_ready().await;
alix_group
.send_message("first".as_bytes(), &alix)
.await
.unwrap();
notify
.wait_for_delivery()
.await
.expect("didn't get `first`");
bo_group
.send_message("second".as_bytes(), &bo)
.await
.unwrap();
notify.wait_for_delivery().await.unwrap();
alix_group
.send_message("third".as_bytes(), &alix)
.await
.unwrap();
notify.wait_for_delivery().await.unwrap();
bo_group
.send_message("fourth".as_bytes(), &bo)
.await
.unwrap();
notify.wait_for_delivery().await.unwrap();
let messages = messages.lock();
assert_eq!(messages[0].decrypted_message_bytes, b"first");
assert_eq!(messages[1].decrypted_message_bytes, b"second");
assert_eq!(messages[2].decrypted_message_bytes, b"third");
assert_eq!(messages[3].decrypted_message_bytes, b"fourth");
}
#[tokio::test(flavor = "multi_thread", worker_threads = 10)]
async fn test_stream_all_messages_changing_group_list() {
let alix = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let bo = ClientBuilder::new_test_client(&generate_local_wallet()).await;
let caro = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let alix_group = alix
.create_group(None, GroupMetadataOptions::default())
.unwrap();
alix_group
.add_members_by_inbox_id(&alix, vec![caro.inbox_id()])
.await
.unwrap();
let messages: Arc<Mutex<Vec<StoredGroupMessage>>> = Arc::new(Mutex::new(Vec::new()));
let messages_clone = messages.clone();
let delivery = Delivery::new(None);
let delivery_pointer = delivery.clone();
let mut handle =
Client::<TestClient>::stream_all_messages_with_callback(caro.clone(), move |message| {
delivery_pointer.notify_one();
(*messages_clone.lock()).push(message);
});
handle.wait_for_ready().await;
alix_group
.send_message("first".as_bytes(), &alix)
.await
.unwrap();
delivery
.wait_for_delivery()
.await
.expect("timed out waiting for `first`");
let bo_group = bo
.create_group(None, GroupMetadataOptions::default())
.unwrap();
bo_group
.add_members_by_inbox_id(&bo, vec![caro.inbox_id()])
.await
.unwrap();
bo_group
.send_message("second".as_bytes(), &bo)
.await
.unwrap();
delivery
.wait_for_delivery()
.await
.expect("timed out waiting for `second`");
alix_group
.send_message("third".as_bytes(), &alix)
.await
.unwrap();
delivery
.wait_for_delivery()
.await
.expect("timed out waiting for `third`");
let alix_group_2 = alix
.create_group(None, GroupMetadataOptions::default())
.unwrap();
alix_group_2
.add_members_by_inbox_id(&alix, vec![caro.inbox_id()])
.await
.unwrap();
alix_group
.send_message("fourth".as_bytes(), &alix)
.await
.unwrap();
delivery
.wait_for_delivery()
.await
.expect("timed out waiting for `fourth`");
alix_group_2
.send_message("fifth".as_bytes(), &alix)
.await
.unwrap();
delivery
.wait_for_delivery()
.await
.expect("timed out waiting for `fifth`");
{
let messages = messages.lock();
assert_eq!(messages.len(), 5);
}
let a = handle.handle.abort_handle();
a.abort();
let _ = handle.handle.await;
assert!(a.is_finished());
alix_group
.send_message("should not show up".as_bytes(), &alix)
.await
.unwrap();
tokio::time::sleep(std::time::Duration::from_millis(100)).await;
let messages = messages.lock();
assert_eq!(messages.len(), 5);
}
#[ignore]
#[tokio::test(flavor = "multi_thread", worker_threads = 10)]
async fn test_stream_all_messages_does_not_lose_messages() {
let alix = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let caro = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let alix_group = alix
.create_group(None, GroupMetadataOptions::default())
.unwrap();
alix_group
.add_members_by_inbox_id(&alix, vec![caro.inbox_id()])
.await
.unwrap();
let messages: Arc<Mutex<Vec<StoredGroupMessage>>> = Arc::new(Mutex::new(Vec::new()));
let messages_clone = messages.clone();
let blocked = Arc::new(AtomicU64::new(55));
let blocked_pointer = blocked.clone();
let mut handle =
Client::<TestClient>::stream_all_messages_with_callback(caro.clone(), move |message| {
(*messages_clone.lock()).push(message);
blocked_pointer.fetch_sub(1, Ordering::SeqCst);
});
handle.wait_for_ready().await;
let alix_group_pointer = alix_group.clone();
let alix_pointer = alix.clone();
tokio::spawn(async move {
for _ in 0..50 {
alix_group_pointer
.send_message(b"spam", &alix_pointer)
.await
.unwrap();
tokio::time::sleep(std::time::Duration::from_micros(200)).await;
}
});
for _ in 0..5 {
let new_group = alix
.create_group(None, GroupMetadataOptions::default())
.unwrap();
new_group
.add_members_by_inbox_id(&alix, vec![caro.inbox_id()])
.await
.unwrap();
new_group
.send_message(b"spam from new group", &alix)
.await
.unwrap();
}
let _ = tokio::time::timeout(std::time::Duration::from_secs(120), async {
while blocked.load(Ordering::SeqCst) > 0 {
tokio::task::yield_now().await;
}
})
.await;
let missed_messages = blocked.load(Ordering::SeqCst);
if missed_messages > 0 {
println!("Missed {} Messages", missed_messages);
panic!("Test failed due to missed messages");
}
}
#[tokio::test(flavor = "multi_thread")]
async fn test_self_group_creation() {
let alix = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let bo = Arc::new(ClientBuilder::new_test_client(&generate_local_wallet()).await);
let groups = Arc::new(Mutex::new(Vec::new()));
let notify = Delivery::new(None);
let (notify_pointer, groups_pointer) = (notify.clone(), groups.clone());
let closer =
Client::<TestClient>::stream_conversations_with_callback(alix.clone(), move |g| {
let mut groups = groups_pointer.lock();
groups.push(g);
notify_pointer.notify_one();
});
alix.create_group(None, GroupMetadataOptions::default())
.unwrap();
notify
.wait_for_delivery()
.await
.expect("Stream never received group");
{
let grps = groups.lock();
assert_eq!(grps.len(), 1);
}
let group = bo
.create_group(None, GroupMetadataOptions::default())
.unwrap();
group
.add_members_by_inbox_id(&bo, vec![alix.inbox_id()])
.await
.unwrap();
notify.wait_for_delivery().await.unwrap();
{
let grps = groups.lock();
assert_eq!(grps.len(), 2);
}
closer.handle.abort();
}
}