1 files changed, 105 insertions, 0 deletions
diff --git a/third_party/rust/sync15/src/client/sync.rs b/third_party/rust/sync15/src/client/sync.rs
new file mode 100644
index 0000000000..808dae9c79
--- /dev/null
+++ b/third_party/rust/sync15/src/client/sync.rs
@@ -0,0 +1,105 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::coll_state::LocalCollStateMachine;
+use super::coll_update::CollectionUpdate;
+use super::state::GlobalState;
+use super::storage_client::Sync15StorageClient;
+use crate::clients_engine;
+use crate::engine::{IncomingChangeset, SyncEngine};
+use crate::error::Error;
+use crate::telemetry;
+use crate::KeyBundle;
+use interrupt_support::Interruptee;
+
+#[allow(clippy::too_many_arguments)]
+pub fn synchronize_with_clients_engine(
+    client: &Sync15StorageClient,
+    global_state: &GlobalState,
+    root_sync_key: &KeyBundle,
+    clients: Option<&clients_engine::Engine<'_>>,
+    engine: &dyn SyncEngine,
+    fully_atomic: bool,
+    telem_engine: &mut telemetry::Engine,
+    interruptee: &dyn Interruptee,
+) -> Result<(), Error> {
+    let collection = engine.collection_name();
+    log::info!("Syncing collection {}", collection);
+
+    // our global state machine is ready - get the collection machine going.
+    let mut coll_state =
+        match LocalCollStateMachine::get_state(engine, global_state, root_sync_key)? {
+            Some(coll_state) => coll_state,
+            None => {
+                // XXX - this is either "error" or "declined".
+                log::warn!(
+                    "can't setup for the {} collection - hopefully it works later",
+                    collection
+                );
+                return Ok(());
+            }
+        };
+
+    if let Some(clients) = clients {
+        engine.prepare_for_sync(&|| clients.get_client_data())?;
+    }
+
+    let collection_requests = engine.get_collection_requests(coll_state.last_modified)?;
+    let incoming = if collection_requests.is_empty() {
+        log::info!("skipping incoming for {} - not needed.", collection);
+        vec![IncomingChangeset::new(collection, coll_state.last_modified)]
+    } else {
+        assert_eq!(collection_requests.last().unwrap().collection, collection);
+
+        let count = collection_requests.len();
+        collection_requests
+            .into_iter()
+            .enumerate()
+            .map(|(idx, collection_request)| {
+                interruptee.err_if_interrupted()?;
+                let incoming_changes =
+                    super::fetch_incoming(client, &mut coll_state, &collection_request)?;
+
+                log::info!(
+                    "Downloaded {} remote changes (request {} of {})",
+                    incoming_changes.changes.len(),
+                    idx,
+                    count,
+                );
+                Ok(incoming_changes)
+            })
+            .collect::<Result<Vec<_>, Error>>()?
+    };
+
+    let new_timestamp = incoming.last().expect("must have >= 1").timestamp;
+    let mut outgoing = engine.apply_incoming(incoming, telem_engine)?;
+
+    interruptee.err_if_interrupted()?;
+    // Bump the timestamps now just incase the upload fails.
+    // xxx - duplication below smells wrong
+    outgoing.timestamp = new_timestamp;
+    coll_state.last_modified = new_timestamp;
+
+    log::info!("Uploading {} outgoing changes", outgoing.changes.len());
+    let upload_info =
+        CollectionUpdate::new_from_changeset(client, &coll_state, outgoing, fully_atomic)?
+            .upload()?;
+
+    log::info!(
+        "Upload success ({} records success, {} records failed)",
+        upload_info.successful_ids.len(),
+        upload_info.failed_ids.len()
+    );
+    // ideally we'd report this per-batch, but for now, let's just report it
+    // as a total.
+    let mut telem_outgoing = telemetry::EngineOutgoing::new();
+    telem_outgoing.sent(upload_info.successful_ids.len() + upload_info.failed_ids.len());
+    telem_outgoing.failed(upload_info.failed_ids.len());
+    telem_engine.outgoing(telem_outgoing);
+
+    engine.sync_finished(upload_info.modified_timestamp, upload_info.successful_ids)?;
+
+    log::info!("Sync finished!");
+    Ok(())
+}