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/* 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 anyhow::Result;
use crate::bso::{IncomingBso, OutgoingBso};
use crate::Guid;
/// A BridgedEngine acts as a bridge between application-services, rust
/// implemented sync engines and sync engines as defined by Desktop Firefox.
///
/// [Desktop Firefox has an abstract implementation of a Sync
/// Engine](https://searchfox.org/mozilla-central/source/services/sync/modules/engines.js)
/// with a number of functions each engine is expected to override. Engines
/// implemented in Rust use a different shape (specifically, the
/// [SyncEngine](crate::SyncEngine) trait), so this BridgedEngine trait adapts
/// between the 2.
pub trait BridgedEngine: Send + Sync {
/// Returns the last sync time, in milliseconds, for this engine's
/// collection. This is called before each sync, to determine the lower
/// bound for new records to fetch from the server.
fn last_sync(&self) -> Result<i64>;
/// Sets the last sync time, in milliseconds. This is called throughout
/// the sync, to fast-forward the stored last sync time to match the
/// timestamp on the uploaded records.
fn set_last_sync(&self, last_sync_millis: i64) -> Result<()>;
/// Returns the sync ID for this engine's collection. This is only used in
/// tests.
fn sync_id(&self) -> Result<Option<String>>;
/// Resets the sync ID for this engine's collection, returning the new ID.
/// As a side effect, implementations should reset all local Sync state,
/// as in `reset`.
fn reset_sync_id(&self) -> Result<String>;
/// Ensures that the locally stored sync ID for this engine's collection
/// matches the `new_sync_id` from the server. If the two don't match,
/// implementations should reset all local Sync state, as in `reset`.
/// This method returns the assigned sync ID, which can be either the
/// `new_sync_id`, or a different one if the engine wants to force other
/// devices to reset their Sync state for this collection the next time they
/// sync.
fn ensure_current_sync_id(&self, new_sync_id: &str) -> Result<String>;
/// Tells the tabs engine about recent FxA devices. A bit of a leaky abstration as it only
/// makes sense for tabs.
/// The arg is a json serialized `ClientData` struct.
fn prepare_for_sync(&self, _client_data: &str) -> Result<()> {
Ok(())
}
/// Indicates that the engine is about to start syncing. This is called
/// once per sync, and always before `store_incoming`.
fn sync_started(&self) -> Result<()>;
/// Stages a batch of incoming Sync records. This is called multiple
/// times per sync, once for each batch. Implementations can use the
/// signal to check if the operation was aborted, and cancel any
/// pending work.
fn store_incoming(&self, incoming_records: Vec<IncomingBso>) -> Result<()>;
/// Applies all staged records, reconciling changes on both sides and
/// resolving conflicts. Returns a list of records to upload.
fn apply(&self) -> Result<ApplyResults>;
/// Indicates that the given record IDs were uploaded successfully to the
/// server. This is called multiple times per sync, once for each batch
/// upload.
fn set_uploaded(&self, server_modified_millis: i64, ids: &[Guid]) -> Result<()>;
/// Indicates that all records have been uploaded. At this point, any record
/// IDs marked for upload that haven't been passed to `set_uploaded`, can be
/// assumed to have failed: for example, because the server rejected a record
/// with an invalid TTL or sort index.
fn sync_finished(&self) -> Result<()>;
/// Resets all local Sync state, including any change flags, mirrors, and
/// the last sync time, such that the next sync is treated as a first sync
/// with all new local data. Does not erase any local user data.
fn reset(&self) -> Result<()>;
/// Erases all local user data for this collection, and any Sync metadata.
/// This method is destructive, and unused for most collections.
fn wipe(&self) -> Result<()>;
}
// TODO: We should replace this with OutgoingChangeset to reduce the number
// of types engines need to deal with.
#[derive(Debug, Default)]
pub struct ApplyResults {
/// List of records
pub records: Vec<OutgoingBso>,
/// The number of incoming records whose contents were merged because they
/// changed on both sides. None indicates we aren't reporting this
/// information.
pub num_reconciled: Option<usize>,
}
impl ApplyResults {
pub fn new(records: Vec<OutgoingBso>, num_reconciled: impl Into<Option<usize>>) -> Self {
Self {
records,
num_reconciled: num_reconciled.into(),
}
}
}
// Shorthand for engines that don't care.
impl From<Vec<OutgoingBso>> for ApplyResults {
fn from(records: Vec<OutgoingBso>) -> Self {
Self {
records,
num_reconciled: None,
}
}
}
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