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// Copyright 2024 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! A send queue facility to serializing queuing and sending of messages.
//!
//! # [`Room`] send queue
//!
//! Each room gets its own [`RoomSendQueue`], that's available by calling
//! [`Room::send_queue()`]. The first time this method is called, it will spawn
//! a background task that's used to actually send events, in the order they
//! were passed from calls to [`RoomSendQueue::send()`].
//!
//! This queue tries to simplify error management around sending events, using
//! [`RoomSendQueue::send`] or [`RoomSendQueue::send_raw`]: by default, it will retry to send the
//! same event a few times, before automatically disabling itself, and emitting
//! a notification that can be listened to with the global send queue (see
//! paragraph below) or using [`RoomSendQueue::subscribe()`].
//!
//! It is possible to control whether a single room is enabled using
//! [`RoomSendQueue::set_enabled()`].
//!
//! # Global [`SendQueue`] object
//!
//! The [`Client::send_queue()`] method returns an API object allowing to
//! control all the room send queues:
//!
//! - enable/disable them all at once with [`SendQueue::set_enabled()`].
//! - get notifications about send errors with [`SendQueue::subscribe_errors`].
//! - reload all unsent events that had been persisted in storage using
//! [`SendQueue::respawn_tasks_for_rooms_with_unsent_requests()`]. It is
//! recommended to call this method during initialization of a client,
//! otherwise persisted unsent events will only be re-sent after the send
//! queue for the given room has been reopened for the first time.
//!
//! # Send handle
//!
//! Just after queuing a request to send something, a [`SendHandle`] is
//! returned, allowing manipulating the inflight request.
//!
//! For a send handle for an event, it's possible to edit the event / abort
//! sending it. If it was still in the queue (i.e. not sent yet, or not being
//! sent), then such an action would happen locally (i.e. in the database).
//! Otherwise, it is "too late": the background task may be sending
//! the event already, or has sent it; in that case, the edit/aborting must
//! happen as an actual event materializing this, on the server. To accomplish
//! this, the send queue may send such an event, using the dependency system
//! described below.
//!
//! # Dependency system
//!
//! The send queue includes a simple dependency system, where a
//! [`QueuedRequest`] can have zero or more dependents in the form of
//! [`DependentQueuedRequest`]. A dependent queued request can have at most one
//! depended-upon (parent) queued request.
//!
//! This allows implementing deferred edits/redacts, as hinted to in the
//! previous section.
//!
//! ## Media upload
//!
//! This dependency system also allows uploading medias, since the media's
//! *content* must be uploaded before we send the media *event* that describes
//! it.
//!
//! In the simplest case, that is, a media file and its event must be sent (i.e.
//! no thumbnails):
//!
//! - The file's content is immediately cached in the
//! [`matrix_sdk_base::event_cache::store::EventCacheStore`], using an MXC ID
//! that is temporary and designates a local URI without any possible doubt.
//! - An initial media event is created and uses this temporary MXC ID, and
//! propagated as a local echo for an event.
//! - A [`QueuedRequest`] is pushed to upload the file's media
//! ([`QueuedRequestKind::MediaUpload`]).
//! - A [`DependentQueuedRequest`] is pushed to finish the upload
//! ([`DependentQueuedRequestKind::FinishUpload`]).
//!
//! What is expected to happen, if all goes well, is the following:
//!
//! - the media is uploaded to the media homeserver, which returns the final MXC
//! ID.
//! - when marking the upload request as sent, the MXC ID is injected (as a
//! [`matrix_sdk_base::store::SentRequestKey`]) into the dependent request
//! [`DependentQueuedRequestKind::FinishUpload`] created in the last step
//! above.
//! - next time the send queue handles dependent queries, it'll see this one is
//! ready to be sent, and it will transform it into an event queued request
//! ([`QueuedRequestKind::Event`]), with the event created in the local echo
//! before, updated with the MXC ID returned from the server.
//! - this updated local echo is also propagated as an edit of the local echo to
//! observers, who get the final version with the final MXC IDs at this point
//! too.
//! - then the event is sent normally, as any event sent with the send queue.
//!
//! When there is a thumbnail, things behave similarly, with some tweaks:
//!
//! - the thumbnail's content is also stored into the cache store immediately,
//! - the thumbnail is sent first as an [`QueuedRequestKind::MediaUpload`]
//! request,
//! - the file upload is pushed as a dependent request of kind
//! [`DependentQueuedRequestKind::UploadFileWithThumbnail`] (this variant
//! keeps the file's key used to look it up in the cache store).
//! - the media event is then sent as a dependent request as described in the
//! previous section.
//!
//! What's expected to happen is thus the following:
//!
//! - After the thumbnail has been uploaded, the dependent query will retrieve
//! the final MXC ID returned by the homeserver for the thumbnail, and store
//! it into the [`QueuedRequestKind::MediaUpload`]'s `thumbnail_source` field,
//! allowing to remember the thumbnail MXC ID when it's time to finish the
//! upload later.
//! - The dependent request is morphed into another
//! [`QueuedRequestKind::MediaUpload`], for the file itself.
//!
//! The rest of the process is then similar to that of uploading a file without
//! a thumbnail. The only difference is that there's a thumbnail source (MXC ID)
//! remembered and fixed up into the media event, just before sending it.
use std::{
collections::{BTreeMap, BTreeSet, HashMap},
str::FromStr as _,
sync::{
atomic::{AtomicBool, Ordering},
Arc, RwLock as SyncRwLock,
},
};
use as_variant::as_variant;
use matrix_sdk_base::{
event_cache::store::EventCacheStoreError,
media::MediaRequestParameters,
store::{
ChildTransactionId, DependentQueuedRequest, DependentQueuedRequestKind,
FinishUploadThumbnailInfo, QueueWedgeError, QueuedRequest, QueuedRequestKind,
SentMediaInfo, SentRequestKey, SerializableEventContent,
},
store_locks::LockStoreError,
RoomState, StoreError,
};
use matrix_sdk_common::executor::{spawn, JoinHandle};
use mime::Mime;
use ruma::{
events::{
reaction::ReactionEventContent,
relation::Annotation,
room::{message::RoomMessageEventContent, MediaSource},
AnyMessageLikeEventContent, EventContent as _,
},
serde::Raw,
OwnedEventId, OwnedRoomId, OwnedTransactionId, TransactionId,
};
use tokio::sync::{broadcast, Notify, RwLock};
use tracing::{debug, error, info, instrument, trace, warn};
#[cfg(feature = "e2e-encryption")]
use crate::crypto::{OlmError, SessionRecipientCollectionError};
use crate::{
client::WeakClient,
config::RequestConfig,
error::RetryKind,
room::{edit::EditedContent, WeakRoom},
Client, Media, Room,
};
mod upload;
/// A client-wide send queue, for all the rooms known by a client.
pub struct SendQueue {
client: Client,
}
#[cfg(not(tarpaulin_include))]
impl std::fmt::Debug for SendQueue {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("SendQueue").finish_non_exhaustive()
}
}
impl SendQueue {
pub(super) fn new(client: Client) -> Self {
Self { client }
}
/// Reload all the rooms which had unsent requests, and respawn tasks for
/// those rooms.
pub async fn respawn_tasks_for_rooms_with_unsent_requests(&self) {
if !self.is_enabled() {
return;
}
let room_ids =
self.client.store().load_rooms_with_unsent_requests().await.unwrap_or_else(|err| {
warn!("error when loading rooms with unsent requests: {err}");
Vec::new()
});
// Getting the [`RoomSendQueue`] is sufficient to spawn the task if needs be.
for room_id in room_ids {
if let Some(room) = self.client.get_room(&room_id) {
let _ = self.for_room(room);
}
}
}
/// Tiny helper to get the send queue's global context from the [`Client`].
#[inline(always)]
fn data(&self) -> &SendQueueData {
&self.client.inner.send_queue_data
}
/// Get or create a new send queue for a given room, and insert it into our
/// memoized rooms mapping.
fn for_room(&self, room: Room) -> RoomSendQueue {
let data = self.data();
let mut map = data.rooms.write().unwrap();
let room_id = room.room_id();
if let Some(room_q) = map.get(room_id).cloned() {
return room_q;
}
let owned_room_id = room_id.to_owned();
let room_q = RoomSendQueue::new(
self.is_enabled(),
data.error_reporter.clone(),
data.is_dropping.clone(),
&self.client,
owned_room_id.clone(),
);
map.insert(owned_room_id, room_q.clone());
room_q
}
/// Enable or disable the send queue for the entire client, i.e. all rooms.
///
/// If we're disabling the queue, and requests were being sent, they're not
/// aborted, and will continue until a status resolves (error responses
/// will keep the events in the buffer of events to send later). The
/// disablement will happen before the next request is sent.
///
/// This may wake up background tasks and resume sending of requests in the
/// background.
pub async fn set_enabled(&self, enabled: bool) {
debug!(?enabled, "setting global send queue enablement");
self.data().globally_enabled.store(enabled, Ordering::SeqCst);
// Wake up individual rooms we already know about.
for room in self.data().rooms.read().unwrap().values() {
room.set_enabled(enabled);
}
// Reload some extra rooms that might not have been awaken yet, but could have
// requests from previous sessions.
self.respawn_tasks_for_rooms_with_unsent_requests().await;
}
/// Returns whether the send queue is enabled, at a client-wide
/// granularity.
pub fn is_enabled(&self) -> bool {
self.data().globally_enabled.load(Ordering::SeqCst)
}
/// A subscriber to the enablement status (enabled or disabled) of the
/// send queue, along with useful errors.
pub fn subscribe_errors(&self) -> broadcast::Receiver<SendQueueRoomError> {
self.data().error_reporter.subscribe()
}
}
/// A specific room's send queue ran into an error, and it has disabled itself.
#[derive(Clone, Debug)]
pub struct SendQueueRoomError {
/// For which room is the send queue failing?
pub room_id: OwnedRoomId,
/// The error the room has ran into, when trying to send a request.
pub error: Arc<crate::Error>,
/// Whether the error is considered recoverable or not.
///
/// An error that's recoverable will disable the room's send queue, while an
/// unrecoverable error will be parked, until the user decides to do
/// something about it.
pub is_recoverable: bool,
}
impl Client {
/// Returns a [`SendQueue`] that handles sending, retrying and not
/// forgetting about requests that are to be sent.
pub fn send_queue(&self) -> SendQueue {
SendQueue::new(self.clone())
}
}
pub(super) struct SendQueueData {
/// Mapping of room to their unique send queue.
rooms: SyncRwLock<BTreeMap<OwnedRoomId, RoomSendQueue>>,
/// Is the whole mechanism enabled or disabled?
///
/// This is only kept in memory to initialize new room queues with an
/// initial enablement state.
globally_enabled: AtomicBool,
/// Global error updates for the send queue.
error_reporter: broadcast::Sender<SendQueueRoomError>,
/// Are we currently dropping the Client?
is_dropping: Arc<AtomicBool>,
}
impl SendQueueData {
/// Create the data for a send queue, in the given enabled state.
pub fn new(globally_enabled: bool) -> Self {
let (sender, _) = broadcast::channel(32);
Self {
rooms: Default::default(),
globally_enabled: AtomicBool::new(globally_enabled),
error_reporter: sender,
is_dropping: Arc::new(false.into()),
}
}
}
impl Drop for SendQueueData {
fn drop(&mut self) {
// Mark the whole send queue as shutting down, then wake up all the room
// queues so they're stopped too.
debug!("globally dropping the send queue");
self.is_dropping.store(true, Ordering::SeqCst);
let rooms = self.rooms.read().unwrap();
for room in rooms.values() {
room.inner.notifier.notify_one();
}
}
}
impl Room {
/// Returns the [`RoomSendQueue`] for this specific room.
pub fn send_queue(&self) -> RoomSendQueue {
self.client.send_queue().for_room(self.clone())
}
}
/// A per-room send queue.
///
/// This is cheap to clone.
#[derive(Clone)]
pub struct RoomSendQueue {
inner: Arc<RoomSendQueueInner>,
}
#[cfg(not(tarpaulin_include))]
impl std::fmt::Debug for RoomSendQueue {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("RoomSendQueue").finish_non_exhaustive()
}
}
impl RoomSendQueue {
fn new(
globally_enabled: bool,
global_error_reporter: broadcast::Sender<SendQueueRoomError>,
is_dropping: Arc<AtomicBool>,
client: &Client,
room_id: OwnedRoomId,
) -> Self {
let (updates_sender, _) = broadcast::channel(32);
let queue = QueueStorage::new(WeakClient::from_client(client), room_id.clone());
let notifier = Arc::new(Notify::new());
let weak_room = WeakRoom::new(WeakClient::from_client(client), room_id);
let locally_enabled = Arc::new(AtomicBool::new(globally_enabled));
let task = spawn(Self::sending_task(
weak_room.clone(),
queue.clone(),
notifier.clone(),
updates_sender.clone(),
locally_enabled.clone(),
global_error_reporter,
is_dropping,
));
Self {
inner: Arc::new(RoomSendQueueInner {
room: weak_room,
updates: updates_sender,
_task: task,
queue,
notifier,
locally_enabled,
}),
}
}
/// Queues a raw event for sending it to this room.
///
/// This immediately returns, and will push the event to be sent into a
/// queue, handled in the background.
///
/// Callers are expected to consume [`RoomSendQueueUpdate`] via calling
/// the [`Self::subscribe()`] method to get updates about the sending of
/// that event.
///
/// By default, if sending failed on the first attempt, it will be retried a
/// few times. If sending failed after those retries, the entire
/// client's sending queue will be disabled, and it will need to be
/// manually re-enabled by the caller (e.g. after network is back, or when
/// something has been done about the faulty requests).
pub async fn send_raw(
&self,
content: Raw<AnyMessageLikeEventContent>,
event_type: String,
) -> Result<SendHandle, RoomSendQueueError> {
let Some(room) = self.inner.room.get() else {
return Err(RoomSendQueueError::RoomDisappeared);
};
if room.state() != RoomState::Joined {
return Err(RoomSendQueueError::RoomNotJoined);
}
let content = SerializableEventContent::from_raw(content, event_type);
let transaction_id = self.inner.queue.push(content.clone().into()).await?;
trace!(%transaction_id, "manager sends a raw event to the background task");
self.inner.notifier.notify_one();
let send_handle = SendHandle {
room: self.clone(),
transaction_id: transaction_id.clone(),
media_handles: None,
};
let _ = self.inner.updates.send(RoomSendQueueUpdate::NewLocalEvent(LocalEcho {
transaction_id,
content: LocalEchoContent::Event {
serialized_event: content,
send_handle: send_handle.clone(),
send_error: None,
},
}));
Ok(send_handle)
}
/// Queues an event for sending it to this room.
///
/// This immediately returns, and will push the event to be sent into a
/// queue, handled in the background.
///
/// Callers are expected to consume [`RoomSendQueueUpdate`] via calling
/// the [`Self::subscribe()`] method to get updates about the sending of
/// that event.
///
/// By default, if sending failed on the first attempt, it will be retried a
/// few times. If sending failed after those retries, the entire
/// client's sending queue will be disabled, and it will need to be
/// manually re-enabled by the caller (e.g. after network is back, or when
/// something has been done about the faulty requests).
pub async fn send(
&self,
content: AnyMessageLikeEventContent,
) -> Result<SendHandle, RoomSendQueueError> {
self.send_raw(
Raw::new(&content).map_err(RoomSendQueueStorageError::JsonSerialization)?,
content.event_type().to_string(),
)
.await
}
/// Returns the current local requests as well as a receiver to listen to
/// the send queue updates, as defined in [`RoomSendQueueUpdate`].
pub async fn subscribe(
&self,
) -> Result<(Vec<LocalEcho>, broadcast::Receiver<RoomSendQueueUpdate>), RoomSendQueueError>
{
let local_echoes = self.inner.queue.local_echoes(self).await?;
Ok((local_echoes, self.inner.updates.subscribe()))
}
/// A task that must be spawned in the async runtime, running in the
/// background for each room that has a send queue.
///
/// It only progresses forward: nothing can be cancelled at any point, which
/// makes the implementation not overly complicated to follow.
#[instrument(skip_all, fields(room_id = %room.room_id()))]
async fn sending_task(
room: WeakRoom,
queue: QueueStorage,
notifier: Arc<Notify>,
updates: broadcast::Sender<RoomSendQueueUpdate>,
locally_enabled: Arc<AtomicBool>,
global_error_reporter: broadcast::Sender<SendQueueRoomError>,
is_dropping: Arc<AtomicBool>,
) {
info!("spawned the sending task");
loop {
// A request to shut down should be preferred above everything else.
if is_dropping.load(Ordering::SeqCst) {
trace!("shutting down!");
break;
}
// Try to apply dependent requests now; those applying to previously failed
// attempts (local echoes) would succeed now.
let mut new_updates = Vec::new();
if let Err(err) = queue.apply_dependent_requests(&mut new_updates).await {
warn!("errors when applying dependent requests: {err}");
}
for up in new_updates {
let _ = updates.send(up);
}
if !locally_enabled.load(Ordering::SeqCst) {
trace!("not enabled, sleeping");
// Wait for an explicit wakeup.
notifier.notified().await;
continue;
}
let queued_request = match queue.peek_next_to_send().await {
Ok(Some(request)) => request,
Ok(None) => {
trace!("queue is empty, sleeping");
// Wait for an explicit wakeup.
notifier.notified().await;
continue;
}
Err(err) => {
warn!("error when loading next request to send: {err}");
continue;
}
};
let txn_id = queued_request.transaction_id.clone();
trace!(txn_id = %txn_id, "received a request to send!");
let related_txn_id = as_variant!(&queued_request.kind, QueuedRequestKind::MediaUpload { related_to, .. } => related_to.clone());
let Some(room) = room.get() else {
if is_dropping.load(Ordering::SeqCst) {
break;
}
error!("the weak room couldn't be upgraded but we're not shutting down?");
continue;
};
match Self::handle_request(&room, queued_request).await {
Ok(parent_key) => match queue.mark_as_sent(&txn_id, parent_key.clone()).await {
Ok(()) => match parent_key {
SentRequestKey::Event(event_id) => {
let _ = updates.send(RoomSendQueueUpdate::SentEvent {
transaction_id: txn_id,
event_id,
});
}
SentRequestKey::Media(media_info) => {
let _ = updates.send(RoomSendQueueUpdate::UploadedMedia {
related_to: related_txn_id.as_ref().unwrap_or(&txn_id).clone(),
file: media_info.file,
});
}
},
Err(err) => {
warn!("unable to mark queued request as sent: {err}");
}
},
Err(err) => {
let is_recoverable = match err {
crate::Error::Http(ref http_err) => {
// All transient errors are recoverable.
matches!(
http_err.retry_kind(),
RetryKind::Transient { .. } | RetryKind::NetworkFailure
)
}
// `ConcurrentRequestFailed` typically happens because of an HTTP failure;
// since we don't get the underlying error, be lax and consider it
// recoverable, and let observers decide to retry it or not. At some point
// we'll get the actual underlying error.
crate::Error::ConcurrentRequestFailed => true,
// As of 2024-06-27, all other error types are considered unrecoverable.
_ => false,
};
if is_recoverable {
warn!(txn_id = %txn_id, error = ?err, "Recoverable error when sending request: {err}, disabling send queue");
// In this case, we intentionally keep the request in the queue, but mark it
// as not being sent anymore.
queue.mark_as_not_being_sent(&txn_id).await;
// Let observers know about a failure *after* we've marked the item as not
// being sent anymore. Otherwise, there's a possible race where a caller
// might try to remove an item, while it's still marked as being sent,
// resulting in a cancellation failure.
// Disable the queue for this room after a recoverable error happened. This
// should be the sign that this error is temporary (maybe network
// disconnected, maybe the server had a hiccup).
locally_enabled.store(false, Ordering::SeqCst);
} else {
warn!(txn_id = %txn_id, error = ?err, "Unrecoverable error when sending request: {err}");
// Mark the request as wedged, so it's not picked at any future point.
if let Err(storage_error) =
queue.mark_as_wedged(&txn_id, QueueWedgeError::from(&err)).await
{
warn!("unable to mark request as wedged: {storage_error}");
}
}
let error = Arc::new(err);
let _ = global_error_reporter.send(SendQueueRoomError {
room_id: room.room_id().to_owned(),
error: error.clone(),
is_recoverable,
});
let _ = updates.send(RoomSendQueueUpdate::SendError {
transaction_id: related_txn_id.unwrap_or(txn_id),
error,
is_recoverable,
});
}
}
}
info!("exited sending task");
}
/// Handles a single request and returns the [`SentRequestKey`] on success.
async fn handle_request(
room: &Room,
request: QueuedRequest,
) -> Result<SentRequestKey, crate::Error> {
match request.kind {
QueuedRequestKind::Event { content } => {
let (event, event_type) = content.raw();
let res = room
.send_raw(event_type, event)
.with_transaction_id(&request.transaction_id)
.with_request_config(RequestConfig::short_retry())
.await?;
trace!(txn_id = %request.transaction_id, event_id = %res.event_id, "event successfully sent");
Ok(SentRequestKey::Event(res.event_id))
}
QueuedRequestKind::MediaUpload {
content_type,
cache_key,
thumbnail_source,
related_to: relates_to,
} => {
trace!(%relates_to, "uploading media related to event");
let mime = Mime::from_str(&content_type).map_err(|_| {
crate::Error::SendQueueWedgeError(QueueWedgeError::InvalidMimeType {
mime_type: content_type.clone(),
})
})?;
let data = room
.client()
.event_cache_store()
.lock()
.await?
.get_media_content(&cache_key)
.await?
.ok_or(crate::Error::SendQueueWedgeError(
QueueWedgeError::MissingMediaContent,
))?;
#[cfg(feature = "e2e-encryption")]
let media_source = if room.is_encrypted().await? {
trace!("upload will be encrypted (encrypted room)");
let mut cursor = std::io::Cursor::new(data);
let encrypted_file = room
.client()
.upload_encrypted_file(&mime, &mut cursor)
.with_request_config(RequestConfig::short_retry())
.await?;
MediaSource::Encrypted(Box::new(encrypted_file))
} else {
trace!("upload will be in clear text (room without encryption)");
let request_config = RequestConfig::short_retry()
.timeout(Media::reasonable_upload_timeout(&data));
let res =
room.client().media().upload(&mime, data, Some(request_config)).await?;
MediaSource::Plain(res.content_uri)
};
#[cfg(not(feature = "e2e-encryption"))]
let media_source = {
let request_config = RequestConfig::short_retry()
.timeout(Media::reasonable_upload_timeout(&data));
let res =
room.client().media().upload(&mime, data, Some(request_config)).await?;
MediaSource::Plain(res.content_uri)
};
let uri = match &media_source {
MediaSource::Plain(uri) => uri,
MediaSource::Encrypted(encrypted_file) => &encrypted_file.url,
};
trace!(%relates_to, mxc_uri = %uri, "media successfully uploaded");
Ok(SentRequestKey::Media(SentMediaInfo {
file: media_source,
thumbnail: thumbnail_source,
}))
}
}
}
/// Returns whether the room is enabled, at the room level.
pub fn is_enabled(&self) -> bool {
self.inner.locally_enabled.load(Ordering::SeqCst)
}
/// Set the locally enabled flag for this room queue.
pub fn set_enabled(&self, enabled: bool) {
self.inner.locally_enabled.store(enabled, Ordering::SeqCst);
// No need to wake a task to tell it it's been disabled, so only notify if we're
// re-enabling the queue.
if enabled {
self.inner.notifier.notify_one();
}
}
}
impl From<&crate::Error> for QueueWedgeError {
fn from(value: &crate::Error) -> Self {
match value {
#[cfg(feature = "e2e-encryption")]
crate::Error::OlmError(OlmError::SessionRecipientCollectionError(error)) => match error
{
SessionRecipientCollectionError::VerifiedUserHasUnsignedDevice(user_map) => {
QueueWedgeError::InsecureDevices { user_device_map: user_map.clone() }
}
SessionRecipientCollectionError::VerifiedUserChangedIdentity(users) => {
QueueWedgeError::IdentityViolations { users: users.clone() }
}
SessionRecipientCollectionError::CrossSigningNotSetup
| SessionRecipientCollectionError::SendingFromUnverifiedDevice => {
QueueWedgeError::CrossVerificationRequired
}
},
// Flatten errors of `Self` type.
crate::Error::SendQueueWedgeError(error) => error.clone(),
_ => QueueWedgeError::GenericApiError { msg: value.to_string() },
}
}
}
struct RoomSendQueueInner {
/// The room which this send queue relates to.
room: WeakRoom,
/// Broadcaster for notifications about the statuses of requests to be sent.
///
/// Can be subscribed to from the outside.
updates: broadcast::Sender<RoomSendQueueUpdate>,
/// Queue of requests that are either to be sent, or being sent.
///
/// When a request has been sent to the server, it is removed from that
/// queue *after* being sent. That way, we will retry sending upon
/// failure, in the same order requests have been inserted in the first
/// place.
queue: QueueStorage,
/// A notifier that's updated any time common data is touched (stopped or
/// enabled statuses), or the associated room [`QueueStorage`].
notifier: Arc<Notify>,
/// Should the room process new requests or not (because e.g. it might be
/// running off the network)?
locally_enabled: Arc<AtomicBool>,
/// Handle to the actual sending task. Unused, but kept alive along this
/// data structure.
_task: JoinHandle<()>,
}
#[derive(Clone)]
struct QueueStorage {
/// Reference to the client, to get access to the underlying store.
client: WeakClient,
/// To which room is this storage related.
room_id: OwnedRoomId,
/// All the queued requests that are being sent at the moment.
///
/// It also serves as an internal lock on the storage backend.
being_sent: Arc<RwLock<BTreeSet<OwnedTransactionId>>>,
}
impl QueueStorage {
/// Default priority for a queued request.
const LOW_PRIORITY: usize = 0;
/// High priority for a queued request that must be handled before others.
const HIGH_PRIORITY: usize = 10;
/// Create a new queue for queuing requests to be sent later.
fn new(client: WeakClient, room: OwnedRoomId) -> Self {
Self { room_id: room, being_sent: Default::default(), client }
}
/// Small helper to get a strong Client from the weak one.
fn client(&self) -> Result<Client, RoomSendQueueStorageError> {
self.client.get().ok_or(RoomSendQueueStorageError::ClientShuttingDown)
}
/// Push a new event to be sent in the queue, with a default priority of 0.
///
/// Returns the transaction id chosen to identify the request.
async fn push(
&self,
request: QueuedRequestKind,
) -> Result<OwnedTransactionId, RoomSendQueueStorageError> {
let transaction_id = TransactionId::new();
self.client()?
.store()
.save_send_queue_request(
&self.room_id,
transaction_id.clone(),
request,
Self::LOW_PRIORITY,
)
.await?;
Ok(transaction_id)
}
/// Peeks the next request to be sent, marking it as being sent.
///
/// It is required to call [`Self::mark_as_sent`] after it's been
/// effectively sent.
async fn peek_next_to_send(&self) -> Result<Option<QueuedRequest>, RoomSendQueueStorageError> {
// Keep the lock until we're done touching the storage.
let mut being_sent = self.being_sent.write().await;
let queued_requests =
self.client()?.store().load_send_queue_requests(&self.room_id).await?;
if let Some(request) = queued_requests.iter().find(|queued| !queued.is_wedged()) {
being_sent.insert(request.transaction_id.clone());
Ok(Some(request.clone()))
} else {
Ok(None)
}
}
/// Marks a request popped with [`Self::peek_next_to_send`] and identified
/// with the given transaction id as not being sent anymore, so it can
/// be removed from the queue later.
async fn mark_as_not_being_sent(&self, transaction_id: &TransactionId) {
self.being_sent.write().await.remove(transaction_id);
}
/// Marks a request popped with [`Self::peek_next_to_send`] and identified
/// with the given transaction id as being wedged (and not being sent
/// anymore), so it can be removed from the queue later.
async fn mark_as_wedged(
&self,
transaction_id: &TransactionId,
reason: QueueWedgeError,
) -> Result<(), RoomSendQueueStorageError> {
// Keep the lock until we're done touching the storage.
let mut being_sent = self.being_sent.write().await;
being_sent.remove(transaction_id);
Ok(self
.client()?
.store()
.update_send_queue_request_status(&self.room_id, transaction_id, Some(reason))
.await?)
}
/// Marks a request identified with the given transaction id as being now
/// unwedged and adds it back to the queue.
async fn mark_as_unwedged(
&self,
transaction_id: &TransactionId,
) -> Result<(), RoomSendQueueStorageError> {
Ok(self
.client()?
.store()
.update_send_queue_request_status(&self.room_id, transaction_id, None)
.await?)
}
/// Marks a request pushed with [`Self::push`] and identified with the given
/// transaction id as sent, by removing it from the local queue.
async fn mark_as_sent(
&self,
transaction_id: &TransactionId,
parent_key: SentRequestKey,
) -> Result<(), RoomSendQueueStorageError> {
// Keep the lock until we're done touching the storage.
let mut being_sent = self.being_sent.write().await;
being_sent.remove(transaction_id);
let client = self.client()?;
let store = client.store();
// Update all dependent requests.
store.update_dependent_queued_request(&self.room_id, transaction_id, parent_key).await?;
let removed = store.remove_send_queue_request(&self.room_id, transaction_id).await?;
if !removed {
warn!(txn_id = %transaction_id, "request marked as sent was missing from storage");
}
Ok(())
}
/// Cancel a sending command for an event that has been sent with
/// [`Self::push`] with the given transaction id.
///
/// Returns whether the given transaction has been effectively removed. If
/// false, this either means that the transaction id was unrelated to
/// this queue, or that the request was sent before we cancelled it.
async fn cancel_event(
&self,
transaction_id: &TransactionId,
) -> Result<bool, RoomSendQueueStorageError> {
// Keep the lock until we're done touching the storage.
let being_sent = self.being_sent.read().await;
if being_sent.contains(transaction_id) {
// Save the intent to redact the event.
self.client()?
.store()
.save_dependent_queued_request(
&self.room_id,
transaction_id,
ChildTransactionId::new(),
DependentQueuedRequestKind::RedactEvent,
)
.await?;
return Ok(true);
}
let removed =
self.client()?.store().remove_send_queue_request(&self.room_id, transaction_id).await?;
Ok(removed)
}
/// Replace an event that has been sent with [`Self::push`] with the given
/// transaction id, before it's been actually sent.
///
/// Returns whether the given transaction has been effectively edited. If
/// false, this either means that the transaction id was unrelated to
/// this queue, or that the request was sent before we edited it.
async fn replace_event(
&self,
transaction_id: &TransactionId,
serializable: SerializableEventContent,
) -> Result<bool, RoomSendQueueStorageError> {
// Keep the lock until we're done touching the storage.
let being_sent = self.being_sent.read().await;
if being_sent.contains(transaction_id) {
// Save the intent to edit the associated event.
self.client()?
.store()
.save_dependent_queued_request(
&self.room_id,
transaction_id,
ChildTransactionId::new(),
DependentQueuedRequestKind::EditEvent { new_content: serializable },
)
.await?;
return Ok(true);
}
let edited = self
.client()?
.store()
.update_send_queue_request(&self.room_id, transaction_id, serializable.into())
.await?;
Ok(edited)
}
/// Push requests (and dependents) to upload a media.
///
/// See the module-level description for details of the whole processus.
async fn push_media(
&self,
event: RoomMessageEventContent,
content_type: Mime,
send_event_txn: OwnedTransactionId,
upload_file_txn: OwnedTransactionId,
file_media_request: MediaRequestParameters,
thumbnail: Option<(FinishUploadThumbnailInfo, MediaRequestParameters, Mime)>,
) -> Result<(), RoomSendQueueStorageError> {
// Keep the lock until we're done touching the storage.
// TODO refactor to make the relationship between being_sent and the store more
// obvious.
let _guard = self.being_sent.read().await;
let client = self.client()?;
let store = client.store();
let thumbnail_info =
if let Some((thumbnail_info, thumbnail_media_request, thumbnail_content_type)) =
thumbnail
{
let upload_thumbnail_txn = thumbnail_info.txn.clone();
// Save the thumbnail upload request.
store
.save_send_queue_request(
&self.room_id,
upload_thumbnail_txn.clone(),
QueuedRequestKind::MediaUpload {
content_type: thumbnail_content_type.to_string(),
cache_key: thumbnail_media_request,
thumbnail_source: None, // the thumbnail has no thumbnails :)
related_to: send_event_txn.clone(),
},
Self::LOW_PRIORITY,
)
.await?;
// Save the file upload request as a dependent request of the thumbnail upload.
store
.save_dependent_queued_request(
&self.room_id,
&upload_thumbnail_txn,
upload_file_txn.clone().into(),
DependentQueuedRequestKind::UploadFileWithThumbnail {
content_type: content_type.to_string(),
cache_key: file_media_request,
related_to: send_event_txn.clone(),
},
)
.await?;
Some(thumbnail_info)
} else {
// Save the file upload as its own request, not a dependent one.
store
.save_send_queue_request(
&self.room_id,
upload_file_txn.clone(),
QueuedRequestKind::MediaUpload {
content_type: content_type.to_string(),
cache_key: file_media_request,
thumbnail_source: None,
related_to: send_event_txn.clone(),
},
Self::LOW_PRIORITY,
)
.await?;
None
};
// Push the dependent request for the event itself.
store
.save_dependent_queued_request(
&self.room_id,
&upload_file_txn,
send_event_txn.into(),
DependentQueuedRequestKind::FinishUpload {
local_echo: event,
file_upload: upload_file_txn.clone(),
thumbnail_info,
},
)
.await?;
Ok(())
}
/// Reacts to the given local echo of an event.
#[instrument(skip(self))]
async fn react(
&self,
transaction_id: &TransactionId,
key: String,
) -> Result<Option<ChildTransactionId>, RoomSendQueueStorageError> {
let client = self.client()?;
let store = client.store();
let requests = store.load_send_queue_requests(&self.room_id).await?;
// If the target event has been already sent, abort immediately.
if !requests.iter().any(|item| item.transaction_id == transaction_id) {
return Ok(None);
}
// Record the dependent request.
let reaction_txn_id = ChildTransactionId::new();
store
.save_dependent_queued_request(
&self.room_id,
transaction_id,
reaction_txn_id.clone(),
DependentQueuedRequestKind::ReactEvent { key },
)
.await?;
Ok(Some(reaction_txn_id))
}
/// Returns a list of the local echoes, that is, all the requests that we're
/// about to send but that haven't been sent yet (or are being sent).
async fn local_echoes(
&self,
room: &RoomSendQueue,
) -> Result<Vec<LocalEcho>, RoomSendQueueStorageError> {
let client = self.client()?;
let store = client.store();
let local_requests =
store.load_send_queue_requests(&self.room_id).await?.into_iter().filter_map(|queued| {
Some(LocalEcho {
transaction_id: queued.transaction_id.clone(),
content: match queued.kind {
QueuedRequestKind::Event { content } => LocalEchoContent::Event {
serialized_event: content,
send_handle: SendHandle {
room: room.clone(),
transaction_id: queued.transaction_id,
media_handles: None,
},
send_error: queued.error,
},
QueuedRequestKind::MediaUpload { .. } => {
// Don't return uploaded medias as their own things; the accompanying
// event represented as a dependent request should be sufficient.
return None;
}
},
})
});
let reactions_and_medias = store
.load_dependent_queued_requests(&self.room_id)
.await?
.into_iter()
.filter_map(|dep| match dep.kind {
DependentQueuedRequestKind::EditEvent { .. }
| DependentQueuedRequestKind::RedactEvent => {
// TODO: reflect local edits/redacts too?
None
}
DependentQueuedRequestKind::ReactEvent { key } => Some(LocalEcho {
transaction_id: dep.own_transaction_id.clone().into(),
content: LocalEchoContent::React {
key,
send_handle: SendReactionHandle {
room: room.clone(),
transaction_id: dep.own_transaction_id,
},
applies_to: dep.parent_transaction_id,
},
}),
DependentQueuedRequestKind::UploadFileWithThumbnail { .. } => {
// Don't reflect these: only the associated event is interesting to observers.
None
}
DependentQueuedRequestKind::FinishUpload {
local_echo,
file_upload,
thumbnail_info,
} => {
// Materialize as an event local echo.
Some(LocalEcho {
transaction_id: dep.own_transaction_id.clone().into(),
content: LocalEchoContent::Event {
serialized_event: SerializableEventContent::new(&local_echo.into())
.ok()?,
send_handle: SendHandle {
room: room.clone(),
transaction_id: dep.own_transaction_id.into(),
media_handles: Some(MediaHandles {
upload_thumbnail_txn: thumbnail_info.map(|info| info.txn),
upload_file_txn: file_upload,
}),
},
send_error: None,
},
})
}
});
Ok(local_requests.chain(reactions_and_medias).collect())
}
/// Try to apply a single dependent request, whether it's local or remote.
///
/// This swallows errors that would retrigger every time if we retried
/// applying the dependent request: invalid edit content, etc.
///
/// Returns true if the dependent request has been sent (or should not be
/// retried later).
#[instrument(skip_all)]
async fn try_apply_single_dependent_request(
&self,
client: &Client,
dependent_request: DependentQueuedRequest,
new_updates: &mut Vec<RoomSendQueueUpdate>,
) -> Result<bool, RoomSendQueueError> {
let store = client.store();
let parent_key = dependent_request.parent_key;
match dependent_request.kind {
DependentQueuedRequestKind::EditEvent { new_content } => {
if let Some(parent_key) = parent_key {
let Some(event_id) = parent_key.into_event_id() else {
return Err(RoomSendQueueError::StorageError(
RoomSendQueueStorageError::InvalidParentKey,
));
};
// The parent event has been sent, so send an edit event.
let room = client
.get_room(&self.room_id)
.ok_or(RoomSendQueueError::RoomDisappeared)?;
// Check the event is one we know how to edit with an edit event.
// It must be deserializable…
let edited_content = match new_content.deserialize() {
Ok(AnyMessageLikeEventContent::RoomMessage(c)) => {
// Assume no relationships.
EditedContent::RoomMessage(c.into())
}
Ok(AnyMessageLikeEventContent::UnstablePollStart(c)) => {
let poll_start = c.poll_start().clone();
EditedContent::PollStart {
fallback_text: poll_start.question.text.clone(),
new_content: poll_start,
}
}
Ok(c) => {
warn!("Unsupported edit content type: {:?}", c.event_type());
return Ok(true);
}
Err(err) => {
warn!("Unable to deserialize: {err}");
return Ok(true);
}
};
let edit_event = match room.make_edit_event(&event_id, edited_content).await {
Ok(e) => e,
Err(err) => {
warn!("couldn't create edited event: {err}");
return Ok(true);
}
};
// Queue the edit event in the send queue 🧠.
let serializable = SerializableEventContent::from_raw(
Raw::new(&edit_event)
.map_err(RoomSendQueueStorageError::JsonSerialization)?,
edit_event.event_type().to_string(),
);
store
.save_send_queue_request(
&self.room_id,
dependent_request.own_transaction_id.into(),
serializable.into(),
Self::HIGH_PRIORITY,
)
.await
.map_err(RoomSendQueueStorageError::StateStoreError)?;
} else {
// The parent event is still local; update the local echo.
let edited = store
.update_send_queue_request(
&self.room_id,
&dependent_request.parent_transaction_id,
new_content.into(),
)
.await
.map_err(RoomSendQueueStorageError::StateStoreError)?;
if !edited {
warn!("missing local echo upon dependent edit");
}
}
}
DependentQueuedRequestKind::RedactEvent => {
if let Some(parent_key) = parent_key {
let Some(event_id) = parent_key.into_event_id() else {
return Err(RoomSendQueueError::StorageError(
RoomSendQueueStorageError::InvalidParentKey,
));
};
// The parent event has been sent; send a redaction.
let room = client
.get_room(&self.room_id)
.ok_or(RoomSendQueueError::RoomDisappeared)?;
// Ideally we'd use the send queue to send the redaction, but the protocol has
// changed the shape of a room.redaction after v11, so keep it simple and try
// once here.
// Note: no reason is provided because we materialize the intent of "cancel
// sending the parent event".
if let Err(err) = room
.redact(&event_id, None, Some(dependent_request.own_transaction_id.into()))
.await
{
warn!("error when sending a redact for {event_id}: {err}");
return Ok(false);
}
} else {
// The parent event is still local (sending must have failed); redact the local
// echo.
let removed = store
.remove_send_queue_request(
&self.room_id,
&dependent_request.parent_transaction_id,
)
.await
.map_err(RoomSendQueueStorageError::StateStoreError)?;
if !removed {
warn!("missing local echo upon dependent redact");
}
}
}
DependentQueuedRequestKind::ReactEvent { key } => {
if let Some(parent_key) = parent_key {
let Some(parent_event_id) = parent_key.into_event_id() else {
return Err(RoomSendQueueError::StorageError(
RoomSendQueueStorageError::InvalidParentKey,
));
};
// Queue the reaction event in the send queue 🧠.
let react_event =
ReactionEventContent::new(Annotation::new(parent_event_id, key)).into();
let serializable = SerializableEventContent::from_raw(
Raw::new(&react_event)
.map_err(RoomSendQueueStorageError::JsonSerialization)?,
react_event.event_type().to_string(),
);
store
.save_send_queue_request(
&self.room_id,
dependent_request.own_transaction_id.into(),
serializable.into(),
Self::HIGH_PRIORITY,
)
.await
.map_err(RoomSendQueueStorageError::StateStoreError)?;
} else {
// Not applied yet, we should retry later => false.
return Ok(false);
}
}
DependentQueuedRequestKind::UploadFileWithThumbnail {
content_type,
cache_key,
related_to,
} => {
let Some(parent_key) = parent_key else {
// Not finished yet, we should retry later => false.
return Ok(false);
};
self.handle_dependent_file_upload_with_thumbnail(
client,
dependent_request.own_transaction_id.into(),
parent_key,
content_type,
cache_key,
related_to,
)
.await?;
}
DependentQueuedRequestKind::FinishUpload {
local_echo,
file_upload,
thumbnail_info,
} => {
let Some(parent_key) = parent_key else {
// Not finished yet, we should retry later => false.
return Ok(false);
};
self.handle_dependent_finish_upload(
client,
dependent_request.own_transaction_id.into(),
parent_key,
local_echo,
file_upload,
thumbnail_info,
new_updates,
)
.await?;
}
}
Ok(true)
}
#[instrument(skip(self))]
async fn apply_dependent_requests(
&self,
new_updates: &mut Vec<RoomSendQueueUpdate>,
) -> Result<(), RoomSendQueueError> {
// Keep the lock until we're done touching the storage.
let _being_sent = self.being_sent.read().await;
let client = self.client()?;
let store = client.store();
let dependent_requests = store
.load_dependent_queued_requests(&self.room_id)
.await
.map_err(RoomSendQueueStorageError::StateStoreError)?;
let num_initial_dependent_requests = dependent_requests.len();
if num_initial_dependent_requests == 0 {
// Returning early here avoids a bit of useless logging.
return Ok(());
}
let canonicalized_dependent_requests = canonicalize_dependent_requests(&dependent_requests);
// Get rid of the all non-canonical dependent events.
for original in &dependent_requests {
if !canonicalized_dependent_requests
.iter()
.any(|canonical| canonical.own_transaction_id == original.own_transaction_id)
{
store
.remove_dependent_queued_request(&self.room_id, &original.own_transaction_id)
.await
.map_err(RoomSendQueueStorageError::StateStoreError)?;
}
}
let mut num_dependent_requests = canonicalized_dependent_requests.len();
debug!(
num_dependent_requests,
num_initial_dependent_requests, "starting handling of dependent requests"
);
for dependent in canonicalized_dependent_requests {
let dependent_id = dependent.own_transaction_id.clone();
match self.try_apply_single_dependent_request(&client, dependent, new_updates).await {
Ok(should_remove) => {
if should_remove {
// The dependent request has been successfully applied, forget about it.
store
.remove_dependent_queued_request(&self.room_id, &dependent_id)
.await
.map_err(RoomSendQueueStorageError::StateStoreError)?;
num_dependent_requests -= 1;
}
}
Err(err) => {
warn!("error when applying single dependent request: {err}");
}
}
}
debug!(
leftover_dependent_requests = num_dependent_requests,
"stopped handling dependent request"
);
Ok(())
}
/// Remove a single dependent request from storage.
async fn remove_dependent_send_queue_request(
&self,
dependent_event_id: &ChildTransactionId,
) -> Result<bool, RoomSendQueueStorageError> {
// Keep the lock until we're done touching the storage.
let _being_sent = self.being_sent.read().await;
Ok(self
.client()?
.store()
.remove_dependent_queued_request(&self.room_id, dependent_event_id)
.await?)
}
}
/// The content of a local echo.
#[derive(Clone, Debug)]
pub enum LocalEchoContent {
/// The local echo contains an actual event ready to display.
Event {
/// Content of the event itself (along with its type) that we are about
/// to send.
serialized_event: SerializableEventContent,
/// A handle to manipulate the sending of the associated event.
send_handle: SendHandle,
/// Whether trying to send this local echo failed in the past with an
/// unrecoverable error (see [`SendQueueRoomError::is_recoverable`]).
send_error: Option<QueueWedgeError>,
},
/// A local echo has been reacted to.
React {
/// The key with which the local echo has been reacted to.
key: String,
/// A handle to manipulate the sending of the reaction.
send_handle: SendReactionHandle,
/// The local echo which has been reacted to.
applies_to: OwnedTransactionId,
},
}
/// A local representation for a request that hasn't been sent yet to the user's
/// homeserver.
#[derive(Clone, Debug)]
pub struct LocalEcho {
/// Transaction id used to identify the associated request.
pub transaction_id: OwnedTransactionId,
/// The content for the local echo.
pub content: LocalEchoContent,
}
/// An update to a room send queue, observable with
/// [`RoomSendQueue::subscribe`].
#[derive(Clone, Debug)]
pub enum RoomSendQueueUpdate {
/// A new local event is being sent.
///
/// There's been a user query to create this event. It is being sent to the
/// server.
NewLocalEvent(LocalEcho),
/// A local event that hadn't been sent to the server yet has been cancelled
/// before sending.
CancelledLocalEvent {
/// Transaction id used to identify this event.
transaction_id: OwnedTransactionId,
},
/// A local event's content has been replaced with something else.
ReplacedLocalEvent {
/// Transaction id used to identify this event.
transaction_id: OwnedTransactionId,
/// The new content replacing the previous one.
new_content: SerializableEventContent,
},
/// An error happened when an event was being sent.
///
/// The event has not been removed from the queue. All the send queues
/// will be disabled after this happens, and must be manually re-enabled.
SendError {
/// Transaction id used to identify this event.
transaction_id: OwnedTransactionId,
/// Error received while sending the event.
error: Arc<crate::Error>,
/// Whether the error is considered recoverable or not.
///
/// An error that's recoverable will disable the room's send queue,
/// while an unrecoverable error will be parked, until the user
/// decides to cancel sending it.
is_recoverable: bool,
},
/// The event has been unwedged and sending is now being retried.
RetryEvent {
/// Transaction id used to identify this event.
transaction_id: OwnedTransactionId,
},
/// The event has been sent to the server, and the query returned
/// successfully.
SentEvent {
/// Transaction id used to identify this event.
transaction_id: OwnedTransactionId,
/// Received event id from the send response.
event_id: OwnedEventId,
},
/// A media has been successfully uploaded.
UploadedMedia {
/// The media event this uploaded media relates to.
related_to: OwnedTransactionId,
/// The final media source for the file that was just uploaded.
file: MediaSource,
},
}
/// An error triggered by the send queue module.
#[derive(Debug, thiserror::Error)]
pub enum RoomSendQueueError {
/// The room isn't in the joined state.
#[error("the room isn't in the joined state")]
RoomNotJoined,
/// The room is missing from the client.
///
/// This happens only whenever the client is shutting down.
#[error("the room is now missing from the client")]
RoomDisappeared,
/// Error coming from storage.
#[error(transparent)]
StorageError(#[from] RoomSendQueueStorageError),
}
/// An error triggered by the send queue storage.
#[derive(Debug, thiserror::Error)]
pub enum RoomSendQueueStorageError {
/// Error caused by the state store.
#[error(transparent)]
StateStoreError(#[from] StoreError),
/// Error caused by the event cache store.
#[error(transparent)]
EventCacheStoreError(#[from] EventCacheStoreError),
/// Error caused when attempting to get a handle on the event cache store.
#[error(transparent)]
LockError(#[from] LockStoreError),
/// Error caused when (de)serializing into/from json.
#[error(transparent)]
JsonSerialization(#[from] serde_json::Error),
/// A parent key was expected to be of a certain type, and it was another
/// type instead.
#[error("a dependent event had an invalid parent key type")]
InvalidParentKey,
/// The client is shutting down.
#[error("The client is shutting down.")]
ClientShuttingDown,
/// An operation not implemented yet on a send handle.
// TODO: remove this
#[error("This operation is not implemented yet for media uploads")]
OperationNotImplementedYet,
}
/// Extra transaction IDs useful during an upload.
#[derive(Clone, Debug)]
struct MediaHandles {
/// Transaction id used when uploading the thumbnail.
///
/// Optional because a media can be uploaded without a thumbnail.
upload_thumbnail_txn: Option<OwnedTransactionId>,
/// Transaction id used when uploading the media itself.
upload_file_txn: OwnedTransactionId,
}
/// A handle to manipulate an event that was scheduled to be sent to a room.
#[derive(Clone, Debug)]
pub struct SendHandle {
/// Link to the send queue used to send this request.
room: RoomSendQueue,
/// Transaction id used for the sent request.
///
/// If this is a media upload, this is the "main" transaction id, i.e. the
/// one used to send the event, and that will be seen by observers.
transaction_id: OwnedTransactionId,
/// Additional handles for a media upload.
media_handles: Option<MediaHandles>,
}
impl SendHandle {
fn nyi_for_uploads(&self) -> Result<(), RoomSendQueueStorageError> {
if self.media_handles.is_some() {
Err(RoomSendQueueStorageError::OperationNotImplementedYet)
} else {
Ok(())
}
}
/// Aborts the sending of the event, if it wasn't sent yet.
///
/// Returns true if the sending could be aborted, false if not (i.e. the
/// event had already been sent).
#[instrument(skip(self), fields(room_id = %self.room.inner.room.room_id(), txn_id = %self.transaction_id))]
pub async fn abort(&self) -> Result<bool, RoomSendQueueStorageError> {
trace!("received an abort request");
self.nyi_for_uploads()?;
if self.room.inner.queue.cancel_event(&self.transaction_id).await? {
trace!("successful abort");
// Propagate a cancelled update too.
let _ = self.room.inner.updates.send(RoomSendQueueUpdate::CancelledLocalEvent {
transaction_id: self.transaction_id.clone(),
});
Ok(true)
} else {
debug!("local echo didn't exist anymore, can't abort");
Ok(false)
}
}
/// Edits the content of a local echo with a raw event content.
///
/// Returns true if the event to be sent was replaced, false if not (i.e.
/// the event had already been sent).
#[instrument(skip(self, new_content), fields(room_id = %self.room.inner.room.room_id(), txn_id = %self.transaction_id))]
pub async fn edit_raw(
&self,
new_content: Raw<AnyMessageLikeEventContent>,
event_type: String,
) -> Result<bool, RoomSendQueueStorageError> {
trace!("received an edit request");
self.nyi_for_uploads()?;
let serializable = SerializableEventContent::from_raw(new_content, event_type);
if self.room.inner.queue.replace_event(&self.transaction_id, serializable.clone()).await? {
trace!("successful edit");
// Wake up the queue, in case the room was asleep before the edit.
self.room.inner.notifier.notify_one();
// Propagate a replaced update too.
let _ = self.room.inner.updates.send(RoomSendQueueUpdate::ReplacedLocalEvent {
transaction_id: self.transaction_id.clone(),
new_content: serializable,
});
Ok(true)
} else {
debug!("local echo doesn't exist anymore, can't edit");
Ok(false)
}
}
/// Edits the content of a local echo with an event content.
///
/// Returns true if the event to be sent was replaced, false if not (i.e.
/// the event had already been sent).
pub async fn edit(
&self,
new_content: AnyMessageLikeEventContent,
) -> Result<bool, RoomSendQueueStorageError> {
self.edit_raw(
Raw::new(&new_content).map_err(RoomSendQueueStorageError::JsonSerialization)?,
new_content.event_type().to_string(),
)
.await
}
/// Unwedge a local echo identified by its transaction identifier and try to
/// resend it.
pub async fn unwedge(&self) -> Result<(), RoomSendQueueError> {
let room = &self.room.inner;
room.queue
.mark_as_unwedged(&self.transaction_id)
.await
.map_err(RoomSendQueueError::StorageError)?;
// If we have media handles, also try to unwedge them.
//
// It's fine to always do it to *all* the transaction IDs at once, because only
// one of the three requests will be active at the same time, i.e. only
// one entry will be updated in the store. The other two are either
// done, or dependent requests.
if let Some(handles) = &self.media_handles {
room.queue
.mark_as_unwedged(&handles.upload_file_txn)
.await
.map_err(RoomSendQueueError::StorageError)?;
if let Some(txn) = &handles.upload_thumbnail_txn {
room.queue.mark_as_unwedged(txn).await.map_err(RoomSendQueueError::StorageError)?;
}
}
// Wake up the queue, in case the room was asleep before unwedging the request.
room.notifier.notify_one();
let _ = room
.updates
.send(RoomSendQueueUpdate::RetryEvent { transaction_id: self.transaction_id.clone() });
Ok(())
}
/// Send a reaction to the event as soon as it's sent.
///
/// If returning `Ok(None)`; this means the reaction couldn't be sent
/// because the event is already a remote one.
#[instrument(skip(self), fields(room_id = %self.room.inner.room.room_id(), txn_id = %self.transaction_id))]
pub async fn react(
&self,
key: String,
) -> Result<Option<SendReactionHandle>, RoomSendQueueStorageError> {
trace!("received an intent to react");
if let Some(reaction_txn_id) =
self.room.inner.queue.react(&self.transaction_id, key.clone()).await?
{
trace!("successfully queued react");
// Wake up the queue, in case the room was asleep before the sending.
self.room.inner.notifier.notify_one();
// Propagate a new local event.
let send_handle = SendReactionHandle {
room: self.room.clone(),
transaction_id: reaction_txn_id.clone(),
};
let _ = self.room.inner.updates.send(RoomSendQueueUpdate::NewLocalEvent(LocalEcho {
// Note: we do want to use the txn_id we're going to use for the reaction, not the
// one for the event we're reacting to.
transaction_id: reaction_txn_id.into(),
content: LocalEchoContent::React {
key,
send_handle: send_handle.clone(),
applies_to: self.transaction_id.clone(),
},
}));
Ok(Some(send_handle))
} else {
debug!("local echo doesn't exist anymore, can't react");
Ok(None)
}
}
}
/// A handle to execute actions on the sending of a reaction.
#[derive(Clone, Debug)]
pub struct SendReactionHandle {
/// Reference to the send queue for the room where this reaction was sent.
room: RoomSendQueue,
/// The own transaction id for the reaction.
transaction_id: ChildTransactionId,
}
impl SendReactionHandle {
/// Abort the sending of the reaction.
///
/// Will return true if the reaction could be aborted, false if it's been
/// sent (and there's no matching local echo anymore).
pub async fn abort(&self) -> Result<bool, RoomSendQueueStorageError> {
if self.room.inner.queue.remove_dependent_send_queue_request(&self.transaction_id).await? {
// Simple case: the reaction was found in the dependent event list.
// Propagate a cancelled update too.
let _ = self.room.inner.updates.send(RoomSendQueueUpdate::CancelledLocalEvent {
transaction_id: self.transaction_id.clone().into(),
});
return Ok(true);
}
// The reaction has already been queued for sending, try to abort it using a
// regular abort.
let handle = SendHandle {
room: self.room.clone(),
transaction_id: self.transaction_id.clone().into(),
media_handles: None,
};
handle.abort().await
}
/// The transaction id that will be used to send this reaction later.
pub fn transaction_id(&self) -> &TransactionId {
&self.transaction_id
}
}
/// From a given source of [`DependentQueuedRequest`], return only the most
/// meaningful, i.e. the ones that wouldn't be overridden after applying the
/// others.
fn canonicalize_dependent_requests(
dependent: &[DependentQueuedRequest],
) -> Vec<DependentQueuedRequest> {
let mut by_txn = HashMap::<OwnedTransactionId, Vec<&DependentQueuedRequest>>::new();
for d in dependent {
let prevs = by_txn.entry(d.parent_transaction_id.clone()).or_default();
if prevs.iter().any(|prev| matches!(prev.kind, DependentQueuedRequestKind::RedactEvent)) {
// The parent event has already been flagged for redaction, don't consider the
// other dependent events.
continue;
}
match &d.kind {
DependentQueuedRequestKind::EditEvent { .. } => {
// Replace any previous edit with this one.
if let Some(prev_edit) = prevs
.iter_mut()
.find(|prev| matches!(prev.kind, DependentQueuedRequestKind::EditEvent { .. }))
{
*prev_edit = d;
} else {
prevs.insert(0, d);
}
}
DependentQueuedRequestKind::UploadFileWithThumbnail { .. }
| DependentQueuedRequestKind::FinishUpload { .. }
| DependentQueuedRequestKind::ReactEvent { .. } => {
// These requests can't be canonicalized, push them as is.
prevs.push(d);
}
DependentQueuedRequestKind::RedactEvent => {
// Remove every other dependent action.
prevs.clear();
prevs.push(d);
}
}
}
by_txn.into_iter().flat_map(|(_parent_txn_id, entries)| entries.into_iter().cloned()).collect()
}
#[cfg(all(test, not(target_arch = "wasm32")))]
mod tests {
use std::{sync::Arc, time::Duration};
use assert_matches2::{assert_let, assert_matches};
use matrix_sdk_base::store::{
ChildTransactionId, DependentQueuedRequest, DependentQueuedRequestKind,
SerializableEventContent,
};
use matrix_sdk_test::{async_test, JoinedRoomBuilder, SyncResponseBuilder};
use ruma::{
events::{room::message::RoomMessageEventContent, AnyMessageLikeEventContent},
room_id, TransactionId,
};
use super::canonicalize_dependent_requests;
use crate::{client::WeakClient, test_utils::logged_in_client};
#[async_test]
async fn test_client_no_cycle_with_send_queue() {
for enabled in [true, false] {
let client = logged_in_client(None).await;
let weak_client = WeakClient::from_client(&client);
{
let mut sync_response_builder = SyncResponseBuilder::new();
let room_id = room_id!("!a:b.c");
// Make sure the client knows about the room.
client
.base_client()
.receive_sync_response(
sync_response_builder
.add_joined_room(JoinedRoomBuilder::new(room_id))
.build_sync_response(),
)
.await
.unwrap();
let room = client.get_room(room_id).unwrap();
let q = room.send_queue();
let _watcher = q.subscribe().await;
client.send_queue().set_enabled(enabled).await;
}
drop(client);
// Give a bit of time for background tasks to die.
tokio::time::sleep(Duration::from_millis(500)).await;
// The weak client must be the last reference to the client now.
let client = weak_client.get();
assert!(
client.is_none(),
"too many strong references to the client: {}",
Arc::strong_count(&client.unwrap().inner)
);
}
}
#[test]
fn test_canonicalize_dependent_events_smoke_test() {
// Smoke test: canonicalizing a single dependent event returns it.
let txn = TransactionId::new();
let edit = DependentQueuedRequest {
own_transaction_id: ChildTransactionId::new(),
parent_transaction_id: txn.clone(),
kind: DependentQueuedRequestKind::EditEvent {
new_content: SerializableEventContent::new(
&RoomMessageEventContent::text_plain("edit").into(),
)
.unwrap(),
},
parent_key: None,
};
let res = canonicalize_dependent_requests(&[edit]);
assert_eq!(res.len(), 1);
assert_matches!(&res[0].kind, DependentQueuedRequestKind::EditEvent { .. });
assert_eq!(res[0].parent_transaction_id, txn);
assert!(res[0].parent_key.is_none());
}
#[test]
fn test_canonicalize_dependent_events_redaction_preferred() {
// A redaction is preferred over any other kind of dependent event.
let txn = TransactionId::new();
let mut inputs = Vec::with_capacity(100);
let redact = DependentQueuedRequest {
own_transaction_id: ChildTransactionId::new(),
parent_transaction_id: txn.clone(),
kind: DependentQueuedRequestKind::RedactEvent,
parent_key: None,
};
let edit = DependentQueuedRequest {
own_transaction_id: ChildTransactionId::new(),
parent_transaction_id: txn.clone(),
kind: DependentQueuedRequestKind::EditEvent {
new_content: SerializableEventContent::new(
&RoomMessageEventContent::text_plain("edit").into(),
)
.unwrap(),
},
parent_key: None,
};
inputs.push({
let mut edit = edit.clone();
edit.own_transaction_id = ChildTransactionId::new();
edit
});
inputs.push(redact);
for _ in 0..98 {
let mut edit = edit.clone();
edit.own_transaction_id = ChildTransactionId::new();
inputs.push(edit);
}
let res = canonicalize_dependent_requests(&inputs);
assert_eq!(res.len(), 1);
assert_matches!(&res[0].kind, DependentQueuedRequestKind::RedactEvent);
assert_eq!(res[0].parent_transaction_id, txn);
}
#[test]
fn test_canonicalize_dependent_events_last_edit_preferred() {
let parent_txn = TransactionId::new();
// The latest edit of a list is always preferred.
let inputs = (0..10)
.map(|i| DependentQueuedRequest {
own_transaction_id: ChildTransactionId::new(),
parent_transaction_id: parent_txn.clone(),
kind: DependentQueuedRequestKind::EditEvent {
new_content: SerializableEventContent::new(
&RoomMessageEventContent::text_plain(format!("edit{i}")).into(),
)
.unwrap(),
},
parent_key: None,
})
.collect::<Vec<_>>();
let txn = inputs[9].parent_transaction_id.clone();
let res = canonicalize_dependent_requests(&inputs);
assert_eq!(res.len(), 1);
assert_let!(DependentQueuedRequestKind::EditEvent { new_content } = &res[0].kind);
assert_let!(
AnyMessageLikeEventContent::RoomMessage(msg) = new_content.deserialize().unwrap()
);
assert_eq!(msg.body(), "edit9");
assert_eq!(res[0].parent_transaction_id, txn);
}
#[test]
fn test_canonicalize_multiple_local_echoes() {
let txn1 = TransactionId::new();
let txn2 = TransactionId::new();
let child1 = ChildTransactionId::new();
let child2 = ChildTransactionId::new();
let inputs = vec![
// This one pertains to txn1.
DependentQueuedRequest {
own_transaction_id: child1.clone(),
kind: DependentQueuedRequestKind::RedactEvent,
parent_transaction_id: txn1.clone(),
parent_key: None,
},
// This one pertains to txn2.
DependentQueuedRequest {
own_transaction_id: child2,
kind: DependentQueuedRequestKind::EditEvent {
new_content: SerializableEventContent::new(
&RoomMessageEventContent::text_plain("edit").into(),
)
.unwrap(),
},
parent_transaction_id: txn2.clone(),
parent_key: None,
},
];
let res = canonicalize_dependent_requests(&inputs);
// The canonicalization shouldn't depend per event id.
assert_eq!(res.len(), 2);
for dependent in res {
if dependent.own_transaction_id == child1 {
assert_eq!(dependent.parent_transaction_id, txn1);
assert_matches!(dependent.kind, DependentQueuedRequestKind::RedactEvent);
} else {
assert_eq!(dependent.parent_transaction_id, txn2);
assert_matches!(dependent.kind, DependentQueuedRequestKind::EditEvent { .. });
}
}
}
#[test]
fn test_canonicalize_reactions_after_edits() {
// Sending reactions should happen after edits to a given event.
let txn = TransactionId::new();
let react_id = ChildTransactionId::new();
let react = DependentQueuedRequest {
own_transaction_id: react_id.clone(),
kind: DependentQueuedRequestKind::ReactEvent { key: "🧠".to_owned() },
parent_transaction_id: txn.clone(),
parent_key: None,
};
let edit_id = ChildTransactionId::new();
let edit = DependentQueuedRequest {
own_transaction_id: edit_id.clone(),
kind: DependentQueuedRequestKind::EditEvent {
new_content: SerializableEventContent::new(
&RoomMessageEventContent::text_plain("edit").into(),
)
.unwrap(),
},
parent_transaction_id: txn,
parent_key: None,
};
let res = canonicalize_dependent_requests(&[react, edit]);
assert_eq!(res.len(), 2);
assert_eq!(res[0].own_transaction_id, edit_id);
assert_eq!(res[1].own_transaction_id, react_id);
}
}