Merge branch 'multithreaded-crypto'

matrix_sdk/examples/wasm_command_bot/Cargo.toml

@@ -10,15 +10,15 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-url = "2.1.1"
+url = "2.2.1"
-wasm-bindgen = { version = "0.2.62", features = ["serde-serialize"] }
+wasm-bindgen = { version = "0.2.72", features = ["serde-serialize"] }
-wasm-bindgen-futures = "0.4.12"
+wasm-bindgen-futures = "0.4.22"
-console_error_panic_hook = "*"
+console_error_panic_hook = "0.1.6"
-web-sys = { version = "0.3.39", features = ["console"] }
+web-sys = { version = "0.3.49", features = ["console"] }
 
 [dependencies.matrix-sdk]
 path = "../.."
 default-features = false
-features = ["native-tls"]
+features = ["native-tls", "encryption"]
 
 [workspace]

matrix_sdk/examples/wasm_command_bot/README.md

@@ -7,6 +7,4 @@ You can build the example locally with:
 
 and then visiting http://localhost:8080 in a browser should run the example!
 
-Note: Encryption isn't supported yet
-
 This example is loosely based off of [this example](https://github.com/seanmonstar/reqwest/tree/master/examples/wasm_github_fetch), an example usage of `fetch` from `wasm-bindgen`.

matrix_sdk/examples/wasm_command_bot/package.json

@@ -5,8 +5,8 @@
     },
     "devDependencies": {
         "@wasm-tool/wasm-pack-plugin": "1.0.1",
-        "text-encoding": "^0.7.0",
         "html-webpack-plugin": "^3.2.0",
+        "text-encoding": "^0.7.0",
         "webpack": "^4.29.4",
         "webpack-cli": "^3.1.1",
         "webpack-dev-server": "^3.1.0"

matrix_sdk/examples/wasm_command_bot/src/lib.rs

@@ -1,7 +1,7 @@
 use matrix_sdk::{
     deserialized_responses::SyncResponse,
     events::{
-        room::message::{MessageEventContent, TextMessageEventContent},
+        room::message::{MessageEventContent, MessageType, TextMessageEventContent},
         AnyMessageEventContent, AnySyncMessageEvent, AnySyncRoomEvent, SyncMessageEvent,
     },
     identifiers::RoomId,
@@ -17,35 +17,49 @@ impl WasmBot {
     async fn on_room_message(
         &self,
         room_id: &RoomId,
-        event: SyncMessageEvent<MessageEventContent>,
+        event: &SyncMessageEvent<MessageEventContent>,
     ) {
         let msg_body = if let SyncMessageEvent {
-            content: MessageEventContent::Text(TextMessageEventContent { body: msg_body, .. }),
+            content:
+                MessageEventContent {
+                    msgtype: MessageType::Text(TextMessageEventContent { body: msg_body, .. }),
+                    ..
+                },
             ..
         } = event
         {
-            msg_body.clone()
+            msg_body
         } else {
             return;
         };
 
         console::log_1(&format!("Received message event {:?}", &msg_body).into());
 
-        if msg_body.starts_with("!party") {
+        if msg_body.contains("!party") {
-            let content = AnyMessageEventContent::RoomMessage(MessageEventContent::Text(
+            let content = AnyMessageEventContent::RoomMessage(MessageEventContent::text_plain(
-                TextMessageEventContent::plain("🎉🎊🥳 let's PARTY with wasm!! 🥳🎊🎉".to_string()),
+                "🎉🎊🥳 let's PARTY!! 🥳🎊🎉",
             ));
 
-            self.0.room_send(&room_id, content, None).await.unwrap();
+            println!("sending");
+
+            self.0
+                // send our message to the room we found the "!party" command in
+                // the last parameter is an optional Uuid which we don't care about.
+                .room_send(room_id, content, None)
+                .await
+                .unwrap();
+
+            println!("message sent");
         }
     }
+
     async fn on_sync_response(&self, response: SyncResponse) -> LoopCtrl {
         console::log_1(&"Synced".to_string().into());
 
         for (room_id, room) in response.rooms.join {
             for event in room.timeline.events {
                 if let AnySyncRoomEvent::Message(AnySyncMessageEvent::RoomMessage(ev)) = event {
-                    self.on_room_message(&room_id, ev).await
+                    self.on_room_message(&room_id, &ev).await
                 }
             }
         }

matrix_sdk_common/Cargo.toml

@@ -34,5 +34,7 @@ default-features = false
 features = ["sync"]
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
+futures = "0.3.12"
 futures-locks = { version = "0.6.0", default-features = false }
+wasm-bindgen-futures = "0.4"
 uuid = { version = "0.8.2", default-features = false, features = ["v4", "wasm-bindgen"] }

matrix_sdk_common/src/executor.rs

@@ -0,0 +1,42 @@
+//! Abstraction over an executor so we can spawn tasks under WASM the same way
+//! we do usually.
+#[cfg(target_arch = "wasm32")]
+use std::{
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+#[cfg(not(target_arch = "wasm32"))]
+pub use tokio::spawn;
+
+#[cfg(target_arch = "wasm32")]
+use wasm_bindgen_futures::spawn_local;
+
+#[cfg(target_arch = "wasm32")]
+use futures::{future::RemoteHandle, Future, FutureExt};
+
+#[cfg(target_arch = "wasm32")]
+pub fn spawn<F, T>(future: F) -> JoinHandle<T>
+where
+    F: Future<Output = T> + 'static,
+{
+    let fut = future.unit_error();
+    let (fut, handle) = fut.remote_handle();
+    spawn_local(fut);
+
+    JoinHandle { handle }
+}
+
+#[cfg(target_arch = "wasm32")]
+pub struct JoinHandle<T> {
+    handle: RemoteHandle<Result<T, ()>>,
+}
+
+#[cfg(target_arch = "wasm32")]
+impl<T: 'static> Future for JoinHandle<T> {
+    type Output = Result<T, ()>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        Pin::new(&mut self.handle).poll(cx)
+    }
+}

matrix_sdk_common/src/lib.rs

@@ -14,6 +14,7 @@ pub use ruma::{
 pub use uuid;
 
 pub mod deserialized_responses;
+pub mod executor;
 pub mod locks;
 
 /// Super trait that is used for our store traits, this trait will differ if

matrix_sdk_crypto/Cargo.toml

@@ -29,6 +29,7 @@ serde_json = "1.0.61"
 zeroize = { version = "1.2.0", features = ["zeroize_derive"] }
 
 # Misc dependencies
+futures = "0.3.12"
 sled = { version = "0.34.6", optional = true }
 thiserror = "1.0.23"
 tracing = "0.1.22"
@@ -44,14 +45,13 @@ byteorder = "1.4.2"
 
 [dev-dependencies]
 tokio = { version = "1.1.0", default-features = false, features = ["rt-multi-thread", "macros"] }
-futures = "0.3.12"
 proptest = "0.10.1"
 serde_json = "1.0.61"
 tempfile = "3.2.0"
 http = "0.2.3"
 matrix-sdk-test = { version = "0.2.0", path = "../matrix_sdk_test" }
 indoc = "1.0.3"
-criterion = { version = "0.3.4", features = ["async", "async_futures", "html_reports"] }
+criterion = { version = "0.3.4", features = ["async", "async_tokio", "html_reports"] }
 
 [target.'cfg(target_os = "linux")'.dev-dependencies]
 pprof = { version = "0.4.2", features = ["flamegraph"] }

matrix_sdk_crypto/benches/crypto_bench.rs

@@ -1,11 +1,10 @@
 #[cfg(target_os = "linux")]
 mod perf;
 
-use std::convert::TryFrom;
+use std::{convert::TryFrom, sync::Arc};
 
-use criterion::{async_executor::FuturesExecutor, *};
+use criterion::*;
 
-use futures::executor::block_on;
 use matrix_sdk_common::{
     api::r0::{
         keys::{claim_keys, get_keys},
@@ -17,6 +16,7 @@ use matrix_sdk_common::{
 use matrix_sdk_crypto::{EncryptionSettings, OlmMachine};
 use matrix_sdk_test::response_from_file;
 use serde_json::Value;
+use tokio::runtime::Builder;
 
 fn alice_id() -> UserId {
     user_id!("@alice:example.org")
@@ -40,7 +40,17 @@ fn keys_claim_response() -> claim_keys::Response {
     claim_keys::Response::try_from(data).expect("Can't parse the keys upload response")
 }
 
+fn huge_keys_query_resopnse() -> get_keys::Response {
+    let data = include_bytes!("./keys_query_2000_members.json");
+    let data: Value = serde_json::from_slice(data).unwrap();
+    let data = response_from_file(&data);
+    get_keys::Response::try_from(data).expect("Can't parse the keys query response")
+}
+
 pub fn keys_query(c: &mut Criterion) {
+    let runtime = Builder::new_multi_thread()
+        .build()
+        .expect("Can't create runtime");
     let machine = OlmMachine::new(&alice_id(), &alice_device_id());
     let response = keys_query_response();
     let uuid = Uuid::new_v4();
@@ -62,13 +72,14 @@ pub fn keys_query(c: &mut Criterion) {
         BenchmarkId::new("memory store", &name),
         &response,
         |b, response| {
-            b.to_async(FuturesExecutor)
+            b.to_async(&runtime)
                 .iter(|| async { machine.mark_request_as_sent(&uuid, response).await.unwrap() })
         },
     );
 
     let dir = tempfile::tempdir().unwrap();
-    let machine = block_on(OlmMachine::new_with_default_store(
+    let machine = runtime
+        .block_on(OlmMachine::new_with_default_store(
             &alice_id(),
             &alice_device_id(),
             dir.path(),
@@ -80,7 +91,7 @@ pub fn keys_query(c: &mut Criterion) {
         BenchmarkId::new("sled store", &name),
         &response,
         |b, response| {
-            b.to_async(FuturesExecutor)
+            b.to_async(&runtime)
                 .iter(|| async { machine.mark_request_as_sent(&uuid, response).await.unwrap() })
         },
     );
@@ -89,6 +100,12 @@ pub fn keys_query(c: &mut Criterion) {
 }
 
 pub fn keys_claiming(c: &mut Criterion) {
+    let runtime = Arc::new(
+        Builder::new_multi_thread()
+            .build()
+            .expect("Can't create runtime"),
+    );
+
     let keys_query_response = keys_query_response();
     let uuid = Uuid::new_v4();
 
@@ -111,10 +128,16 @@ pub fn keys_claiming(c: &mut Criterion) {
             b.iter_batched(
                 || {
                     let machine = OlmMachine::new(&alice_id(), &alice_device_id());
-                    block_on(machine.mark_request_as_sent(&uuid, &keys_query_response)).unwrap();
+                    runtime
-                    machine
+                        .block_on(machine.mark_request_as_sent(&uuid, &keys_query_response))
+                        .unwrap();
+                    (machine, runtime.clone())
+                },
+                move |(machine, runtime)| {
+                    runtime
+                        .block_on(machine.mark_request_as_sent(&uuid, response))
+                        .unwrap()
                 },
-                move |machine| block_on(machine.mark_request_as_sent(&uuid, response)).unwrap(),
                 BatchSize::SmallInput,
             )
         },
@@ -127,17 +150,24 @@ pub fn keys_claiming(c: &mut Criterion) {
             b.iter_batched(
                 || {
                     let dir = tempfile::tempdir().unwrap();
-                    let machine = block_on(OlmMachine::new_with_default_store(
+                    let machine = runtime
+                        .block_on(OlmMachine::new_with_default_store(
                             &alice_id(),
                             &alice_device_id(),
                             dir.path(),
                             None,
                         ))
                         .unwrap();
-                    block_on(machine.mark_request_as_sent(&uuid, &keys_query_response)).unwrap();
+                    runtime
-                    machine
+                        .block_on(machine.mark_request_as_sent(&uuid, &keys_query_response))
+                        .unwrap();
+                    (machine, runtime.clone())
+                },
+                move |(machine, runtime)| {
+                    runtime
+                        .block_on(machine.mark_request_as_sent(&uuid, response))
+                        .unwrap()
                 },
-                move |machine| block_on(machine.mark_request_as_sent(&uuid, response)).unwrap(),
                 BatchSize::SmallInput,
             )
         },
@@ -147,6 +177,10 @@ pub fn keys_claiming(c: &mut Criterion) {
 }
 
 pub fn room_key_sharing(c: &mut Criterion) {
+    let runtime = Builder::new_multi_thread()
+        .build()
+        .expect("Can't create runtime");
+
     let keys_query_response = keys_query_response();
     let uuid = Uuid::new_v4();
     let response = keys_claim_response();
@@ -161,15 +195,19 @@ pub fn room_key_sharing(c: &mut Criterion) {
         .fold(0, |acc, d| acc + d.len());
 
     let machine = OlmMachine::new(&alice_id(), &alice_device_id());
-    block_on(machine.mark_request_as_sent(&uuid, &keys_query_response)).unwrap();
+    runtime
-    block_on(machine.mark_request_as_sent(&uuid, &response)).unwrap();
+        .block_on(machine.mark_request_as_sent(&uuid, &keys_query_response))
+        .unwrap();
+    runtime
+        .block_on(machine.mark_request_as_sent(&uuid, &response))
+        .unwrap();
 
     let mut group = c.benchmark_group("Room key sharing");
     group.throughput(Throughput::Elements(count as u64));
     let name = format!("{} devices", count);
 
     group.bench_function(BenchmarkId::new("memory store", &name), |b| {
-        b.to_async(FuturesExecutor).iter(|| async {
+        b.to_async(&runtime).iter(|| async {
             let requests = machine
                 .share_group_session(&room_id, users.iter(), EncryptionSettings::default())
                 .await
@@ -189,18 +227,23 @@ pub fn room_key_sharing(c: &mut Criterion) {
     });
 
     let dir = tempfile::tempdir().unwrap();
-    let machine = block_on(OlmMachine::new_with_default_store(
+    let machine = runtime
+        .block_on(OlmMachine::new_with_default_store(
             &alice_id(),
             &alice_device_id(),
             dir.path(),
             None,
         ))
         .unwrap();
-    block_on(machine.mark_request_as_sent(&uuid, &keys_query_response)).unwrap();
+    runtime
-    block_on(machine.mark_request_as_sent(&uuid, &response)).unwrap();
+        .block_on(machine.mark_request_as_sent(&uuid, &keys_query_response))
+        .unwrap();
+    runtime
+        .block_on(machine.mark_request_as_sent(&uuid, &response))
+        .unwrap();
 
     group.bench_function(BenchmarkId::new("sled store", &name), |b| {
-        b.to_async(FuturesExecutor).iter(|| async {
+        b.to_async(&runtime).iter(|| async {
             let requests = machine
                 .share_group_session(&room_id, users.iter(), EncryptionSettings::default())
                 .await
@@ -222,6 +265,58 @@ pub fn room_key_sharing(c: &mut Criterion) {
     group.finish()
 }
 
+pub fn devices_missing_sessions_collecting(c: &mut Criterion) {
+    let runtime = Builder::new_multi_thread()
+        .build()
+        .expect("Can't create runtime");
+
+    let machine = OlmMachine::new(&alice_id(), &alice_device_id());
+    let response = huge_keys_query_resopnse();
+    let uuid = Uuid::new_v4();
+    let users: Vec<UserId> = response.device_keys.keys().cloned().collect();
+
+    let count = response
+        .device_keys
+        .values()
+        .fold(0, |acc, d| acc + d.len());
+
+    let mut group = c.benchmark_group("Devices missing sessions collecting");
+    group.throughput(Throughput::Elements(count as u64));
+
+    let name = format!("{} devices", count);
+
+    runtime
+        .block_on(machine.mark_request_as_sent(&uuid, &response))
+        .unwrap();
+
+    group.bench_function(BenchmarkId::new("memory store", &name), |b| {
+        b.to_async(&runtime).iter_with_large_drop(|| async {
+            machine.get_missing_sessions(users.iter()).await.unwrap()
+        })
+    });
+
+    let dir = tempfile::tempdir().unwrap();
+    let machine = runtime
+        .block_on(OlmMachine::new_with_default_store(
+            &alice_id(),
+            &alice_device_id(),
+            dir.path(),
+            None,
+        ))
+        .unwrap();
+
+    runtime
+        .block_on(machine.mark_request_as_sent(&uuid, &response))
+        .unwrap();
+
+    group.bench_function(BenchmarkId::new("sled store", &name), |b| {
+        b.to_async(&runtime)
+            .iter(|| async { machine.get_missing_sessions(users.iter()).await.unwrap() })
+    });
+
+    group.finish()
+}
+
 fn criterion() -> Criterion {
     #[cfg(target_os = "linux")]
     let criterion = Criterion::default().with_profiler(perf::FlamegraphProfiler::new(100));
@@ -234,6 +329,6 @@ fn criterion() -> Criterion {
 criterion_group! {
     name = benches;
     config = criterion();
-    targets = keys_query, keys_claiming, room_key_sharing
+    targets = keys_query, keys_claiming, room_key_sharing, devices_missing_sessions_collecting,
 }
 criterion_main!(benches);

matrix_sdk_crypto/src/identities/manager.rs

@@ -12,17 +12,19 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use futures::future::join_all;
 use std::{
     collections::{BTreeMap, HashSet},
     convert::TryFrom,
     sync::Arc,
 };
-use tracing::{info, trace, warn};
+use tracing::{trace, warn};
 
 use matrix_sdk_common::{
     api::r0::keys::get_keys::Response as KeysQueryResponse,
     encryption::DeviceKeys,
-    identifiers::{DeviceId, DeviceIdBox, UserId},
+    executor::spawn,
+    identifiers::{DeviceIdBox, UserId},
 };
 
 use crate::{
@@ -35,6 +37,12 @@ use crate::{
     store::{Changes, DeviceChanges, IdentityChanges, Result as StoreResult, Store},
 };
 
+enum DeviceChange {
+    New(ReadOnlyDevice),
+    Updated(ReadOnlyDevice),
+    None,
+}
+
 #[derive(Debug, Clone)]
 pub(crate) struct IdentityManager {
     user_id: Arc<UserId>,
@@ -57,10 +65,6 @@ impl IdentityManager {
         &self.user_id
     }
 
-    fn device_id(&self) -> &DeviceId {
-        &self.device_id
-    }
-
     /// Receive a successful keys query response.
     ///
     /// Returns a list of devices newly discovered devices and devices that
@@ -74,17 +78,8 @@ impl IdentityManager {
         &self,
         response: &KeysQueryResponse,
     ) -> OlmResult<(DeviceChanges, IdentityChanges)> {
-        // TODO create a enum that tells us how the device/identity changed,
-        // e.g. new/deleted/display name change.
-        //
-        // TODO create a struct that will hold the device/identity and the
-        // change enum and return the struct.
-        //
-        // TODO once outbound group sessions hold on to the set of users that
-        // received the session, invalidate the session if a user device
-        // got added/deleted.
         let changed_devices = self
-            .handle_devices_from_key_query(&response.device_keys)
+            .handle_devices_from_key_query(response.device_keys.clone())
             .await?;
         let changed_identities = self.handle_cross_singing_keys(response).await?;
 
@@ -94,11 +89,113 @@ impl IdentityManager {
             ..Default::default()
         };
 
+        // TODO turn this into a single transaction.
         self.store.save_changes(changes).await?;
+        let updated_users: Vec<&UserId> = response.device_keys.keys().collect();
+
+        for user_id in updated_users {
+            self.store.update_tracked_user(user_id, false).await?;
+        }
 
         Ok((changed_devices, changed_identities))
     }
 
+    async fn update_or_create_device(
+        store: Store,
+        device_keys: DeviceKeys,
+    ) -> StoreResult<DeviceChange> {
+        let old_device = store
+            .get_readonly_device(&device_keys.user_id, &device_keys.device_id)
+            .await?;
+
+        if let Some(mut device) = old_device {
+            if let Err(e) = device.update_device(&device_keys) {
+                warn!(
+                    "Failed to update the device keys for {} {}: {:?}",
+                    device.user_id(),
+                    device.device_id(),
+                    e
+                );
+                Ok(DeviceChange::None)
+            } else {
+                Ok(DeviceChange::Updated(device))
+            }
+        } else {
+            match ReadOnlyDevice::try_from(&device_keys) {
+                Ok(d) => {
+                    trace!("Adding a new device to the device store {:?}", d);
+                    Ok(DeviceChange::New(d))
+                }
+                Err(e) => {
+                    warn!(
+                        "Failed to create a new device for {} {}: {:?}",
+                        device_keys.user_id, device_keys.device_id, e
+                    );
+                    Ok(DeviceChange::None)
+                }
+            }
+        }
+    }
+
+    async fn update_user_devices(
+        store: Store,
+        own_user_id: Arc<UserId>,
+        own_device_id: Arc<DeviceIdBox>,
+        user_id: UserId,
+        device_map: BTreeMap<DeviceIdBox, DeviceKeys>,
+    ) -> StoreResult<DeviceChanges> {
+        let mut changes = DeviceChanges::default();
+
+        let current_devices: HashSet<DeviceIdBox> = device_map.keys().cloned().collect();
+
+        let tasks = device_map
+            .into_iter()
+            .filter_map(|(device_id, device_keys)| {
+                // We don't need our own device in the device store.
+                if user_id == *own_user_id && device_id == *own_device_id {
+                    None
+                } else if user_id != device_keys.user_id || device_id != device_keys.device_id {
+                    warn!(
+                        "Mismatch in device keys payload of device {}|{} from user {}|{}",
+                        device_id, device_keys.device_id, user_id, device_keys.user_id
+                    );
+                    None
+                } else {
+                    Some(spawn(Self::update_or_create_device(
+                        store.clone(),
+                        device_keys,
+                    )))
+                }
+            });
+
+        let results = join_all(tasks).await;
+
+        for device in results {
+            let device = device.expect("Creating or updating a device panicked")?;
+
+            match device {
+                DeviceChange::New(d) => changes.new.push(d),
+                DeviceChange::Updated(d) => changes.changed.push(d),
+                DeviceChange::None => (),
+            }
+        }
+
+        let current_devices: HashSet<&DeviceIdBox> = current_devices.iter().collect();
+        let stored_devices = store.get_readonly_devices(&user_id).await?;
+        let stored_devices_set: HashSet<&DeviceIdBox> = stored_devices.keys().collect();
+
+        let deleted_devices_set = stored_devices_set.difference(&current_devices);
+
+        for device_id in deleted_devices_set {
+            if let Some(device) = stored_devices.get(*device_id) {
+                device.mark_as_deleted();
+                changes.deleted.push(device.clone());
+            }
+        }
+
+        Ok(changes)
+    }
+
     /// Handle the device keys part of a key query response.
     ///
     /// # Arguments
@@ -110,69 +207,28 @@ impl IdentityManager {
     /// they are new, one of their properties has changed or they got deleted.
     async fn handle_devices_from_key_query(
         &self,
-        device_keys_map: &BTreeMap<UserId, BTreeMap<DeviceIdBox, DeviceKeys>>,
+        device_keys_map: BTreeMap<UserId, BTreeMap<DeviceIdBox, DeviceKeys>>,
     ) -> StoreResult<DeviceChanges> {
         let mut changes = DeviceChanges::default();
 
-        for (user_id, device_map) in device_keys_map {
+        let tasks = device_keys_map
-            // TODO move this out into the handle keys query response method
+            .into_iter()
-            // since we might fail handle the new device at any point here or
+            .map(|(user_id, device_keys_map)| {
-            // when updating the user identities.
+                spawn(Self::update_user_devices(
-            self.store.update_tracked_user(user_id, false).await?;
+                    self.store.clone(),
+                    self.user_id.clone(),
+                    self.device_id.clone(),
+                    user_id,
+                    device_keys_map,
+                ))
+            });
 
-            for (device_id, device_keys) in device_map.iter() {
+        let results = join_all(tasks).await;
-                // We don't need our own device in the device store.
-                if user_id == self.user_id() && &**device_id == self.device_id() {
-                    continue;
-                }
 
-                if user_id != &device_keys.user_id || device_id != &device_keys.device_id {
+        for result in results {
-                    warn!(
+            let change_fragment = result.expect("Panic while updating user devices")?;
-                        "Mismatch in device keys payload of device {}|{} from user {}|{}",
-                        device_id, device_keys.device_id, user_id, device_keys.user_id
-                    );
-                    continue;
-                }
 
-                let device = self.store.get_readonly_device(&user_id, device_id).await?;
+            changes.extend(change_fragment);
-
-                if let Some(mut device) = device {
-                    if let Err(e) = device.update_device(device_keys) {
-                        warn!(
-                            "Failed to update the device keys for {} {}: {:?}",
-                            user_id, device_id, e
-                        );
-                        continue;
-                    }
-                    changes.changed.push(device);
-                } else {
-                    let device = match ReadOnlyDevice::try_from(device_keys) {
-                        Ok(d) => d,
-                        Err(e) => {
-                            warn!(
-                                "Failed to create a new device for {} {}: {:?}",
-                                user_id, device_id, e
-                            );
-                            continue;
-                        }
-                    };
-                    info!("Adding a new device to the device store {:?}", device);
-                    changes.new.push(device);
-                }
-            }
-
-            let current_devices: HashSet<&DeviceIdBox> = device_map.keys().collect();
-            let stored_devices = self.store.get_readonly_devices(&user_id).await?;
-            let stored_devices_set: HashSet<&DeviceIdBox> = stored_devices.keys().collect();
-
-            let deleted_devices_set = stored_devices_set.difference(&current_devices);
-
-            for device_id in deleted_devices_set {
-                if let Some(device) = stored_devices.get(*device_id) {
-                    device.mark_as_deleted();
-                    changes.deleted.push(device.clone());
-                }
-            }
         }
 
         Ok(changes)

matrix_sdk_crypto/src/requests.rs

@@ -63,6 +63,14 @@ impl ToDeviceRequest {
     pub fn txn_id_string(&self) -> String {
         self.txn_id.to_string()
     }
+
+    /// Get the number of unique messages this request contains.
+    ///
+    /// *Note*: A single message may be sent to multiple devices, so this may or
+    /// may not be the number of devices that will receive the messages as well.
+    pub fn message_count(&self) -> usize {
+        self.messages.values().map(|d| d.len()).sum()
+    }
 }
 
 /// Request that will publish a cross signing identity.

matrix_sdk_crypto/src/session_manager/group_sessions.rs

@@ -17,6 +17,8 @@ use std::{
     sync::Arc,
 };
 
+use futures::future::join_all;
+
 use dashmap::DashMap;
 use matrix_sdk_common::{
     api::r0::to_device::DeviceIdOrAllDevices,
@@ -24,6 +26,7 @@ use matrix_sdk_common::{
         room::{encrypted::EncryptedEventContent, history_visibility::HistoryVisibility},
         AnyMessageEventContent, EventType,
     },
+    executor::spawn,
     identifiers::{DeviceId, DeviceIdBox, RoomId, UserId},
     uuid::Uuid,
 };
@@ -52,7 +55,7 @@ pub struct GroupSessionManager {
 }
 
 impl GroupSessionManager {
-    const MAX_TO_DEVICE_MESSAGES: usize = 20;
+    const MAX_TO_DEVICE_MESSAGES: usize = 250;
 
     pub(crate) fn new(account: Account, store: Store) -> Self {
         Self {
@@ -188,35 +191,57 @@ impl GroupSessionManager {
     /// Encrypt the given content for the given devices and create a to-device
     /// requests that sends the encrypted content to them.
     async fn encrypt_session_for(
-        &self,
         content: Value,
-        devices: &[Device],
+        devices: Vec<Device>,
     ) -> OlmResult<(Uuid, ToDeviceRequest, Vec<Session>)> {
         let mut messages = BTreeMap::new();
         let mut changed_sessions = Vec::new();
 
-        for device in devices {
+        let encrypt = |device: Device, content: Value| async move {
+            let mut message = BTreeMap::new();
+
             let encrypted = device.encrypt(EventType::RoomKey, content.clone()).await;
 
-            let (used_session, encrypted) = match encrypted {
+            let used_session = match encrypted {
-                Ok(c) => c,
+                Ok((session, encrypted)) => {
-                // TODO we'll want to create m.room_key.withheld here.
+                    message
-                Err(OlmError::MissingSession)
-                | Err(OlmError::EventError(EventError::MissingSenderKey)) => {
-                    continue;
-                }
-                Err(e) => return Err(e),
-            };
-
-            changed_sessions.push(used_session);
-
-            messages
                         .entry(device.user_id().clone())
                         .or_insert_with(BTreeMap::new)
                         .insert(
                             DeviceIdOrAllDevices::DeviceId(device.device_id().into()),
                             serde_json::value::to_raw_value(&encrypted)?,
                         );
+                    Some(session)
+                }
+                // TODO we'll want to create m.room_key.withheld here.
+                Err(OlmError::MissingSession)
+                | Err(OlmError::EventError(EventError::MissingSenderKey)) => None,
+                Err(e) => return Err(e),
+            };
+
+            Ok((used_session, message))
+        };
+
+        let tasks: Vec<_> = devices
+            .iter()
+            .map(|d| spawn(encrypt(d.clone(), content.clone())))
+            .collect();
+
+        let results = join_all(tasks).await;
+
+        for result in results {
+            let (used_session, message) = result.expect("Encryption task panicked")?;
+
+            if let Some(session) = used_session {
+                changed_sessions.push(session);
+            }
+
+            for (user, device_messages) in message.into_iter() {
+                messages
+                    .entry(user)
+                    .or_insert_with(BTreeMap::new)
+                    .extend(device_messages);
+            }
         }
 
         let id = Uuid::new_v4();
@@ -227,6 +252,12 @@ impl GroupSessionManager {
             messages,
         };
 
+        trace!(
+            recipient_count = request.message_count(),
+            transaction_id = ?id,
+            "Created a to-device request carrying a room_key"
+        );
+
         Ok((id, request, changed_sessions))
     }
 
@@ -334,6 +365,24 @@ impl GroupSessionManager {
         Ok((should_rotate, devices))
     }
 
+    pub async fn encrypt_request(
+        chunk: Vec<Device>,
+        content: Value,
+        outbound: OutboundGroupSession,
+        message_index: u32,
+        being_shared: Arc<DashMap<Uuid, OutboundGroupSession>>,
+    ) -> OlmResult<Vec<Session>> {
+        let (id, request, used_sessions) =
+            Self::encrypt_session_for(content.clone(), chunk).await?;
+
+        if !request.messages.is_empty() {
+            outbound.add_request(id, request.into(), message_index);
+            being_shared.insert(id, outbound.clone());
+        }
+
+        Ok(used_sessions)
+    }
+
     /// Get to-device requests to share a group session with users in a room.
     ///
     /// # Arguments
@@ -427,18 +476,23 @@ impl GroupSessionManager {
             );
         }
 
-        for device_map_chunk in devices.chunks(Self::MAX_TO_DEVICE_MESSAGES) {
+        let tasks: Vec<_> = devices
-            let (id, request, used_sessions) = self
+            .chunks(Self::MAX_TO_DEVICE_MESSAGES)
-                .encrypt_session_for(key_content.clone(), device_map_chunk)
+            .map(|chunk| {
-                .await?;
+                spawn(Self::encrypt_request(
+                    chunk.to_vec(),
+                    key_content.clone(),
+                    outbound.clone(),
+                    message_index,
+                    self.outbound_sessions_being_shared.clone(),
+                ))
+            })
+            .collect();
 
-            if !request.messages.is_empty() {
+        for result in join_all(tasks).await {
-                outbound.add_request(id, request.into(), message_index);
+            let used_sessions: OlmResult<Vec<Session>> = result.expect("Encryption task paniced");
-                self.outbound_sessions_being_shared
-                    .insert(id, outbound.clone());
-            }
 
-            changes.sessions.extend(used_sessions);
+            changes.sessions.extend(used_sessions?);
         }
 
         let requests = outbound.pending_requests();
@@ -474,3 +528,84 @@ impl GroupSessionManager {
         Ok(requests)
     }
 }
+
+#[cfg(test)]
+mod test {
+    use std::convert::TryFrom;
+
+    use matrix_sdk_common::{
+        api::r0::keys::{claim_keys, get_keys},
+        identifiers::{room_id, user_id, DeviceIdBox, UserId},
+        uuid::Uuid,
+    };
+    use matrix_sdk_test::response_from_file;
+    use serde_json::Value;
+
+    use crate::{EncryptionSettings, OlmMachine};
+
+    fn alice_id() -> UserId {
+        user_id!("@alice:example.org")
+    }
+
+    fn alice_device_id() -> DeviceIdBox {
+        "JLAFKJWSCS".into()
+    }
+
+    fn keys_query_response() -> get_keys::Response {
+        let data = include_bytes!("../../benches/keys_query.json");
+        let data: Value = serde_json::from_slice(data).unwrap();
+        let data = response_from_file(&data);
+        get_keys::Response::try_from(data).expect("Can't parse the keys upload response")
+    }
+
+    fn keys_claim_response() -> claim_keys::Response {
+        let data = include_bytes!("../../benches/keys_claim.json");
+        let data: Value = serde_json::from_slice(data).unwrap();
+        let data = response_from_file(&data);
+        claim_keys::Response::try_from(data).expect("Can't parse the keys upload response")
+    }
+
+    async fn machine() -> OlmMachine {
+        let keys_query = keys_query_response();
+        let keys_claim = keys_claim_response();
+        let uuid = Uuid::new_v4();
+
+        let machine = OlmMachine::new(&alice_id(), &alice_device_id());
+
+        machine
+            .mark_request_as_sent(&uuid, &keys_query)
+            .await
+            .unwrap();
+        machine
+            .mark_request_as_sent(&uuid, &keys_claim)
+            .await
+            .unwrap();
+
+        machine
+    }
+
+    #[tokio::test]
+    async fn test_sharing() {
+        let machine = machine().await;
+        let room_id = room_id!("!test:localhost");
+        let keys_claim = keys_claim_response();
+
+        let users: Vec<_> = keys_claim.one_time_keys.keys().collect();
+
+        let requests = machine
+            .share_group_session(
+                &room_id,
+                users.clone().into_iter(),
+                EncryptionSettings::default(),
+            )
+            .await
+            .unwrap();
+
+        let event_count: usize = requests.iter().map(|r| r.message_count()).sum();
+
+        // The keys claim response has a couple of one-time keys with invalid
+        // signatures, thus only 148 sessions are actually created, we check
+        // that all 148 valid sessions get an room key.
+        assert_eq!(event_count, 148);
+    }
+}

matrix_sdk_crypto/src/session_manager/sessions.rs

@@ -195,9 +195,9 @@ impl SessionManager {
         // Add the list of devices that the user wishes to establish sessions
         // right now.
         for user_id in users {
-            let user_devices = self.store.get_user_devices(user_id).await?;
+            let user_devices = self.store.get_readonly_devices(user_id).await?;
 
-            for device in user_devices.devices() {
+            for (device_id, device) in user_devices.into_iter() {
                 let sender_key = if let Some(k) = device.get_key(DeviceKeyAlgorithm::Curve25519) {
                     k
                 } else {
@@ -216,10 +216,7 @@ impl SessionManager {
                     missing
                         .entry(user_id.to_owned())
                         .or_insert_with(BTreeMap::new)
-                        .insert(
+                        .insert(device_id, DeviceKeyAlgorithm::SignedCurve25519);
-                            device.device_id().into(),
-                            DeviceKeyAlgorithm::SignedCurve25519,
-                        );
                 }
             }
         }

matrix_sdk_crypto/src/store/mod.rs

@@ -126,6 +126,15 @@ pub struct DeviceChanges {
     pub deleted: Vec<ReadOnlyDevice>,
 }
 
+impl DeviceChanges {
+    /// Merge the given `DeviceChanges` into this instance of `DeviceChanges`.
+    pub fn extend(&mut self, other: DeviceChanges) {
+        self.new.extend(other.new);
+        self.changed.extend(other.changed);
+        self.deleted.extend(other.deleted);
+    }
+}
+
 impl Store {
     pub fn new(
         user_id: Arc<UserId>,

matrix_sdk_crypto/src/store/sled.rs

@@ -16,11 +16,11 @@ use std::{
     collections::{HashMap, HashSet},
     convert::TryFrom,
     path::{Path, PathBuf},
-    sync::Arc,
+    sync::{Arc, RwLock},
 };
 
 use dashmap::DashSet;
-use olm_rs::PicklingMode;
+use olm_rs::{account::IdentityKeys, PicklingMode};
 pub use sled::Error;
 use sled::{
     transaction::{ConflictableTransactionError, TransactionError},
@@ -95,9 +95,17 @@ impl EncodeKey for (&str, &str, &str) {
     }
 }
 
+#[derive(Clone, Debug)]
+pub struct AccountInfo {
+    user_id: Arc<UserId>,
+    device_id: Arc<DeviceIdBox>,
+    identity_keys: Arc<IdentityKeys>,
+}
+
 /// An in-memory only store that will forget all the E2EE key once it's dropped.
 #[derive(Clone)]
 pub struct SledStore {
+    account_info: Arc<RwLock<Option<AccountInfo>>>,
     path: Option<PathBuf>,
     inner: Db,
     pickle_key: Arc<PickleKey>,
@@ -159,6 +167,10 @@ impl SledStore {
         SledStore::open_helper(db, None, passphrase)
     }
 
+    fn get_account_info(&self) -> Option<AccountInfo> {
+        self.account_info.read().unwrap().clone()
+    }
+
     fn open_helper(db: Db, path: Option<PathBuf>, passphrase: Option<&str>) -> Result<Self> {
         let account = db.open_tree("account")?;
         let private_identity = db.open_tree("private_identity")?;
@@ -184,6 +196,7 @@ impl SledStore {
         };
 
         Ok(Self {
+            account_info: RwLock::new(None).into(),
             path,
             inner: db,
             pickle_key: pickle_key.into(),
@@ -249,22 +262,18 @@ impl SledStore {
         &self,
         room_id: &RoomId,
     ) -> Result<Option<OutboundGroupSession>> {
-        let account = self
+        let account_info = self
-            .load_account()
+            .get_account_info()
-            .await?
             .ok_or(CryptoStoreError::AccountUnset)?;
 
-        let device_id: Arc<DeviceIdBox> = account.device_id().to_owned().into();
-        let identity_keys = account.identity_keys;
-
         self.outbound_group_sessions
             .get(room_id.encode())?
             .map(|p| serde_json::from_slice(&p).map_err(CryptoStoreError::Serialization))
             .transpose()?
             .map(|p| {
                 OutboundGroupSession::from_pickle(
-                    device_id,
+                    account_info.device_id,
-                    identity_keys,
+                    account_info.identity_keys,
                     p,
                     self.get_pickle_mode(),
                 )
@@ -430,16 +439,31 @@ impl CryptoStore for SledStore {
 
             self.load_tracked_users().await?;
 
-            Ok(Some(ReadOnlyAccount::from_pickle(
+            let account = ReadOnlyAccount::from_pickle(pickle, self.get_pickle_mode())?;
-                pickle,
+
-                self.get_pickle_mode(),
+            let account_info = AccountInfo {
-            )?))
+                user_id: account.user_id.clone(),
+                device_id: account.device_id.clone(),
+                identity_keys: account.identity_keys.clone(),
+            };
+
+            *self.account_info.write().unwrap() = Some(account_info);
+
+            Ok(Some(account))
         } else {
             Ok(None)
         }
     }
 
     async fn save_account(&self, account: ReadOnlyAccount) -> Result<()> {
+        let account_info = AccountInfo {
+            user_id: account.user_id.clone(),
+            device_id: account.device_id.clone(),
+            identity_keys: account.identity_keys.clone(),
+        };
+
+        *self.account_info.write().unwrap() = Some(account_info);
+
         let changes = Changes {
             account: Some(account),
             ..Default::default()
@@ -453,9 +477,8 @@ impl CryptoStore for SledStore {
     }
 
     async fn get_sessions(&self, sender_key: &str) -> Result<Option<Arc<Mutex<Vec<Session>>>>> {
-        let account = self
+        let account_info = self
-            .load_account()
+            .get_account_info()
-            .await?
             .ok_or(CryptoStoreError::AccountUnset)?;
 
         if self.session_cache.get(sender_key).is_none() {
@@ -465,9 +488,9 @@ impl CryptoStore for SledStore {
                 .map(|s| serde_json::from_slice(&s?.1).map_err(CryptoStoreError::Serialization))
                 .map(|p| {
                     Session::from_pickle(
-                        account.user_id.clone(),
+                        account_info.user_id.clone(),
-                        account.device_id.clone(),
+                        account_info.device_id.clone(),
-                        account.identity_keys.clone(),
+                        account_info.identity_keys.clone(),
                         p?,
                         self.get_pickle_mode(),
                     )