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Make storage transactions specific to a client_id (#67)

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Transactions for different client_ids cannot interfere with one another,
so this provides an opportunity for the sort of concurrency that a
mult-client hosting solution might need. For example, a postgres backend
could lock the client row in each transaction.
This commit is contained in:
Dustin J. Mitchell 2024-11-27 00:09:03 -05:00 • committed by GitHub
parent 4029c03479
commit 1828a31a24
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
9 changed files with 246 additions and 319 deletions
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136
core/src/inmemory.rs
View file

@ -38,14 +38,16 @@ impl InMemoryStorage {
}
struct InnerTxn<'a> {
client_id: Uuid,
guard: MutexGuard<'a, Inner>,
written: bool,
committed: bool,
}
impl Storage for InMemoryStorage {
fn txn(&self) -> anyhow::Result<Box<dyn StorageTxn + '_>> {
fn txn(&self, client_id: Uuid) -> anyhow::Result<Box<dyn StorageTxn + '_>> {
Ok(Box::new(InnerTxn {
client_id,
guard: self.0.lock().expect("poisoned lock"),
written: false,
committed: false,
@ -54,16 +56,16 @@ impl Storage for InMemoryStorage {
}
impl<'a> StorageTxn for InnerTxn<'a> {
fn get_client(&mut self, client_id: Uuid) -> anyhow::Result<Option<Client>> {
Ok(self.guard.clients.get(&client_id).cloned())
fn get_client(&mut self) -> anyhow::Result<Option<Client>> {
Ok(self.guard.clients.get(&self.client_id).cloned())
}
fn new_client(&mut self, client_id: Uuid, latest_version_id: Uuid) -> anyhow::Result<()> {
if self.guard.clients.contains_key(&client_id) {
return Err(anyhow::anyhow!("Client {} already exists", client_id));
fn new_client(&mut self, latest_version_id: Uuid) -> anyhow::Result<()> {
if self.guard.clients.contains_key(&self.client_id) {
return Err(anyhow::anyhow!("Client {} already exists", self.client_id));
}
self.guard.clients.insert(
client_id,
self.client_id,
Client {
latest_version_id,
snapshot: None,
@ -73,64 +75,57 @@ impl<'a> StorageTxn for InnerTxn<'a> {
Ok(())
}
fn set_snapshot(
&mut self,
client_id: Uuid,
snapshot: Snapshot,
data: Vec<u8>,
) -> anyhow::Result<()> {
fn set_snapshot(&mut self, snapshot: Snapshot, data: Vec<u8>) -> anyhow::Result<()> {
let client = self
.guard
.clients
.get_mut(&client_id)
.get_mut(&self.client_id)
.ok_or_else(|| anyhow::anyhow!("no such client"))?;
client.snapshot = Some(snapshot);
self.guard.snapshots.insert(client_id, data);
self.guard.snapshots.insert(self.client_id, data);
self.written = true;
Ok(())
}
fn get_snapshot_data(
&mut self,
client_id: Uuid,
version_id: Uuid,
) -> anyhow::Result<Option<Vec<u8>>> {
fn get_snapshot_data(&mut self, version_id: Uuid) -> anyhow::Result<Option<Vec<u8>>> {
// sanity check
let client = self.guard.clients.get(&client_id);
let client = self.guard.clients.get(&self.client_id);
let client = client.ok_or_else(|| anyhow::anyhow!("no such client"))?;
if Some(&version_id) != client.snapshot.as_ref().map(|snap| &snap.version_id) {
return Err(anyhow::anyhow!("unexpected snapshot_version_id"));
}
Ok(self.guard.snapshots.get(&client_id).cloned())
Ok(self.guard.snapshots.get(&self.client_id).cloned())
}
fn get_version_by_parent(
&mut self,
client_id: Uuid,
parent_version_id: Uuid,
) -> anyhow::Result<Option<Version>> {
if let Some(parent_version_id) = self.guard.children.get(&(client_id, parent_version_id)) {
if let Some(parent_version_id) = self
.guard
.children
.get(&(self.client_id, parent_version_id))
{
Ok(self
.guard
.versions
.get(&(client_id, *parent_version_id))
.get(&(self.client_id, *parent_version_id))
.cloned())
} else {
Ok(None)
}
}
fn get_version(
&mut self,
client_id: Uuid,
version_id: Uuid,
) -> anyhow::Result<Option<Version>> {
Ok(self.guard.versions.get(&(client_id, version_id)).cloned())
fn get_version(&mut self, version_id: Uuid) -> anyhow::Result<Option<Version>> {
Ok(self
.guard
.versions
.get(&(self.client_id, version_id))
.cloned())
}
fn add_version(
&mut self,
client_id: Uuid,
version_id: Uuid,
parent_version_id: Uuid,
history_segment: Vec<u8>,
@ -142,19 +137,21 @@ impl<'a> StorageTxn for InnerTxn<'a> {
history_segment,
};
if let Some(client) = self.guard.clients.get_mut(&client_id) {
if let Some(client) = self.guard.clients.get_mut(&self.client_id) {
client.latest_version_id = version_id;
if let Some(ref mut snap) = client.snapshot {
snap.versions_since += 1;
}
} else {
return Err(anyhow::anyhow!("Client {} does not exist", client_id));
return Err(anyhow::anyhow!("Client {} does not exist", self.client_id));
}
self.guard
.children
.insert((client_id, parent_version_id), version_id);
self.guard.versions.insert((client_id, version_id), version);
.insert((self.client_id, parent_version_id), version_id);
self.guard
.versions
.insert((self.client_id, version_id), version);
self.written = true;
Ok(())
@ -182,8 +179,8 @@ mod test {
#[test]
fn test_get_client_empty() -> anyhow::Result<()> {
let storage = InMemoryStorage::new();
let mut txn = storage.txn()?;
let maybe_client = txn.get_client(Uuid::new_v4())?;
let mut txn = storage.txn(Uuid::new_v4())?;
let maybe_client = txn.get_client()?;
assert!(maybe_client.is_none());
Ok(())
}
@ -191,20 +188,20 @@ mod test {
#[test]
fn test_client_storage() -> anyhow::Result<()> {
let storage = InMemoryStorage::new();
let mut txn = storage.txn()?;
let client_id = Uuid::new_v4();
let latest_version_id = Uuid::new_v4();
txn.new_client(client_id, latest_version_id)?;
let mut txn = storage.txn(client_id)?;
let client = txn.get_client(client_id)?.unwrap();
let latest_version_id = Uuid::new_v4();
txn.new_client(latest_version_id)?;
let client = txn.get_client()?.unwrap();
assert_eq!(client.latest_version_id, latest_version_id);
assert!(client.snapshot.is_none());
let latest_version_id = Uuid::new_v4();
txn.add_version(client_id, latest_version_id, Uuid::new_v4(), vec![1, 1])?;
txn.add_version(latest_version_id, Uuid::new_v4(), vec![1, 1])?;
let client = txn.get_client(client_id)?.unwrap();
let client = txn.get_client()?.unwrap();
assert_eq!(client.latest_version_id, latest_version_id);
assert!(client.snapshot.is_none());
@ -213,9 +210,9 @@ mod test {
timestamp: Utc::now(),
versions_since: 4,
};
txn.set_snapshot(client_id, snap.clone(), vec![1, 2, 3])?;
txn.set_snapshot(snap.clone(), vec![1, 2, 3])?;
let client = txn.get_client(client_id)?.unwrap();
let client = txn.get_client()?.unwrap();
assert_eq!(client.latest_version_id, latest_version_id);
assert_eq!(client.snapshot.unwrap(), snap);
@ -226,8 +223,9 @@ mod test {
#[test]
fn test_gvbp_empty() -> anyhow::Result<()> {
let storage = InMemoryStorage::new();
let mut txn = storage.txn()?;
let maybe_version = txn.get_version_by_parent(Uuid::new_v4(), Uuid::new_v4())?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
let maybe_version = txn.get_version_by_parent(Uuid::new_v4())?;
assert!(maybe_version.is_none());
Ok(())
}
@ -235,20 +233,15 @@ mod test {
#[test]
fn test_add_version_and_get_version() -> anyhow::Result<()> {
let storage = InMemoryStorage::new();
let mut txn = storage.txn()?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
let version_id = Uuid::new_v4();
let parent_version_id = Uuid::new_v4();
let history_segment = b"abc".to_vec();
txn.new_client(client_id, parent_version_id)?;
txn.add_version(
client_id,
version_id,
parent_version_id,
history_segment.clone(),
)?;
txn.new_client(parent_version_id)?;
txn.add_version(version_id, parent_version_id, history_segment.clone())?;
let expected = Version {
version_id,
@ -256,12 +249,10 @@ mod test {
history_segment,
};
let version = txn
.get_version_by_parent(client_id, parent_version_id)?
.unwrap();
let version = txn.get_version_by_parent(parent_version_id)?.unwrap();
assert_eq!(version, expected);
let version = txn.get_version(client_id, version_id)?.unwrap();
let version = txn.get_version(version_id)?.unwrap();
assert_eq!(version, expected);
txn.commit()?;
@ -271,41 +262,40 @@ mod test {
#[test]
fn test_snapshots() -> anyhow::Result<()> {
let storage = InMemoryStorage::new();
let mut txn = storage.txn()?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
txn.new_client(client_id, Uuid::new_v4())?;
assert!(txn.get_client(client_id)?.unwrap().snapshot.is_none());
txn.new_client(Uuid::new_v4())?;
assert!(txn.get_client()?.unwrap().snapshot.is_none());
let snap = Snapshot {
version_id: Uuid::new_v4(),
timestamp: Utc::now(),
versions_since: 3,
};
txn.set_snapshot(client_id, snap.clone(), vec![9, 8, 9])?;
txn.set_snapshot(snap.clone(), vec![9, 8, 9])?;
assert_eq!(
txn.get_snapshot_data(client_id, snap.version_id)?.unwrap(),
txn.get_snapshot_data(snap.version_id)?.unwrap(),
vec![9, 8, 9]
);
assert_eq!(txn.get_client(client_id)?.unwrap().snapshot, Some(snap));
assert_eq!(txn.get_client()?.unwrap().snapshot, Some(snap));
let snap2 = Snapshot {
version_id: Uuid::new_v4(),
timestamp: Utc::now(),
versions_since: 10,
};
txn.set_snapshot(client_id, snap2.clone(), vec![0, 2, 4, 6])?;
txn.set_snapshot(snap2.clone(), vec![0, 2, 4, 6])?;
assert_eq!(
txn.get_snapshot_data(client_id, snap2.version_id)?.unwrap(),
txn.get_snapshot_data(snap2.version_id)?.unwrap(),
vec![0, 2, 4, 6]
);
assert_eq!(txn.get_client(client_id)?.unwrap().snapshot, Some(snap2));
assert_eq!(txn.get_client()?.unwrap().snapshot, Some(snap2));
// check that mismatched version is detected
assert!(txn.get_snapshot_data(client_id, Uuid::new_v4()).is_err());
assert!(txn.get_snapshot_data(Uuid::new_v4()).is_err());
txn.commit()?;
Ok(())

201
core/src/server.rs
View file

@ -111,14 +111,12 @@ impl Server {
client_id: ClientId,
parent_version_id: VersionId,
) -> Result<GetVersionResult, ServerError> {
let mut txn = self.storage.txn()?;
let client = txn
.get_client(client_id)?
.ok_or(ServerError::NoSuchClient)?;
let mut txn = self.storage.txn(client_id)?;
let client = txn.get_client()?.ok_or(ServerError::NoSuchClient)?;
// If a version with parentVersionId equal to the requested parentVersionId exists, it is
// returned.
if let Some(version) = txn.get_version_by_parent(client_id, parent_version_id)? {
if let Some(version) = txn.get_version_by_parent(parent_version_id)? {
return Ok(GetVersionResult::Success {
version_id: version.version_id,
parent_version_id: version.parent_version_id,
@ -152,10 +150,8 @@ impl Server {
) -> Result<(AddVersionResult, SnapshotUrgency), ServerError> {
log::debug!("add_version(client_id: {client_id}, parent_version_id: {parent_version_id})");
let mut txn = self.storage.txn()?;
let client = txn
.get_client(client_id)?
.ok_or(ServerError::NoSuchClient)?;
let mut txn = self.storage.txn(client_id)?;
let client = txn.get_client()?.ok_or(ServerError::NoSuchClient)?;
// check if this version is acceptable, under the protection of the transaction
if client.latest_version_id != NIL_VERSION_ID
@ -173,7 +169,7 @@ impl Server {
log::debug!("add_version request accepted: new version_id: {version_id}");
// update the DB
txn.add_version(client_id, version_id, parent_version_id, history_segment)?;
txn.add_version(version_id, parent_version_id, history_segment)?;
txn.commit()?;
// calculate the urgency
@ -206,10 +202,8 @@ impl Server {
) -> Result<(), ServerError> {
log::debug!("add_snapshot(client_id: {client_id}, version_id: {version_id})");
let mut txn = self.storage.txn()?;
let client = txn
.get_client(client_id)?
.ok_or(ServerError::NoSuchClient)?;
let mut txn = self.storage.txn(client_id)?;
let client = txn.get_client()?.ok_or(ServerError::NoSuchClient)?;
// NOTE: if the snapshot is rejected, this function logs about it and returns
// Ok(()), as there's no reason to report an errot to the client / user.
@ -245,7 +239,7 @@ impl Server {
}
// get the parent version ID
if let Some(parent) = txn.get_version(client_id, vid)? {
if let Some(parent) = txn.get_version(vid)? {
vid = parent.parent_version_id;
} else {
// this version does not exist; "this should not happen" but if it does,
@ -257,7 +251,6 @@ impl Server {
log::debug!("accepting snapshot for version {version_id}");
txn.set_snapshot(
client_id,
Snapshot {
version_id,
timestamp: Utc::now(),
@ -274,13 +267,11 @@ impl Server {
&self,
client_id: ClientId,
) -> Result<Option<(Uuid, Vec<u8>)>, ServerError> {
let mut txn = self.storage.txn()?;
let client = txn
.get_client(client_id)?
.ok_or(ServerError::NoSuchClient)?;
let mut txn = self.storage.txn(client_id)?;
let client = txn.get_client()?.ok_or(ServerError::NoSuchClient)?;
Ok(if let Some(snap) = client.snapshot {
txn.get_snapshot_data(client_id, snap.version_id)?
txn.get_snapshot_data(snap.version_id)?
.map(|data| (snap.version_id, data))
} else {
None
@ -288,8 +279,8 @@ impl Server {
}
/// Convenience method to get a transaction for the embedded storage.
pub fn txn(&self) -> Result<Box<dyn StorageTxn + '_>, ServerError> {
Ok(self.storage.txn()?)
pub fn txn(&self, client_id: Uuid) -> Result<Box<dyn StorageTxn + '_>, ServerError> {
Ok(self.storage.txn(client_id)?)
}
}
@ -303,14 +294,15 @@ mod test {
fn setup<INIT, RES>(init: INIT) -> anyhow::Result<(Server, RES)>
where
INIT: FnOnce(&mut dyn StorageTxn) -> anyhow::Result<RES>,
INIT: FnOnce(&mut dyn StorageTxn, Uuid) -> anyhow::Result<RES>,
{
let _ = env_logger::builder().is_test(true).try_init();
let storage = InMemoryStorage::new();
let client_id = Uuid::new_v4();
let res;
{
let mut txn = storage.txn()?;
res = init(txn.as_mut())?;
let mut txn = storage.txn(client_id)?;
res = init(txn.as_mut(), client_id)?;
txn.commit()?;
}
Ok((Server::new(ServerConfig::default(), storage), res))
@ -322,19 +314,17 @@ mod test {
snapshot_version: Option<u32>,
snapshot_days_ago: Option<i64>,
) -> anyhow::Result<(Server, Uuid, Vec<Uuid>)> {
let (server, (client_id, versions)) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, (client_id, versions)) = setup(|txn, client_id| {
let mut versions = vec![];
let mut version_id = Uuid::nil();
txn.new_client(client_id, Uuid::nil())?;
txn.new_client(Uuid::nil())?;
debug_assert!(num_versions < u8::MAX.into());
for vnum in 0..num_versions {
let parent_version_id = version_id;
version_id = Uuid::new_v4();
versions.push(version_id);
txn.add_version(
client_id,
version_id,
parent_version_id,
// Generate some unique data for this version.
@ -342,7 +332,6 @@ mod test {
)?;
if Some(vnum) == snapshot_version {
txn.set_snapshot(
client_id,
Snapshot {
version_id,
versions_since: 0,
@ -375,12 +364,12 @@ mod test {
}
// verify that the storage was updated
let mut txn = server.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = server.txn(client_id)?;
let client = txn.get_client()?.unwrap();
assert_eq!(client.latest_version_id, new_version_id);
let parent_version_id = existing_versions.last().cloned().unwrap_or_else(Uuid::nil);
let version = txn.get_version(client_id, new_version_id)?.unwrap();
let version = txn.get_version(new_version_id)?.unwrap();
assert_eq!(version.version_id, new_version_id);
assert_eq!(version.parent_version_id, parent_version_id);
assert_eq!(version.history_segment, expected_history);
@ -439,9 +428,8 @@ mod test {
#[test]
fn get_child_version_not_found_initial_nil() -> anyhow::Result<()> {
let (server, client_id) = setup(|txn| {
let client_id = Uuid::new_v4();
txn.new_client(client_id, NIL_VERSION_ID)?;
let (server, client_id) = setup(|txn, client_id| {
txn.new_client(NIL_VERSION_ID)?;
Ok(client_id)
})?;
@ -455,9 +443,8 @@ mod test {
#[test]
fn get_child_version_not_found_initial_continuing() -> anyhow::Result<()> {
let (server, client_id) = setup(|txn| {
let client_id = Uuid::new_v4();
txn.new_client(client_id, NIL_VERSION_ID)?;
let (server, client_id) = setup(|txn, client_id| {
txn.new_client(NIL_VERSION_ID)?;
Ok(client_id)
})?;
@ -473,12 +460,11 @@ mod test {
#[test]
fn get_child_version_not_found_up_to_date() -> anyhow::Result<()> {
let (server, (client_id, parent_version_id)) = setup(|txn| {
let (server, (client_id, parent_version_id)) = setup(|txn, client_id| {
// add a parent version, but not the requested child version
let client_id = Uuid::new_v4();
let parent_version_id = Uuid::new_v4();
txn.new_client(client_id, parent_version_id)?;
txn.add_version(client_id, parent_version_id, NIL_VERSION_ID, vec![])?;
txn.new_client(parent_version_id)?;
txn.add_version(parent_version_id, NIL_VERSION_ID, vec![])?;
Ok((client_id, parent_version_id))
})?;
@ -492,13 +478,11 @@ mod test {
#[test]
fn get_child_version_gone_not_latest() -> anyhow::Result<()> {
let (server, client_id) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, client_id) = setup(|txn, client_id| {
// Add a parent version, but not the requested parent version
let parent_version_id = Uuid::new_v4();
txn.new_client(client_id, parent_version_id)?;
txn.add_version(client_id, parent_version_id, NIL_VERSION_ID, vec![])?;
txn.new_client(parent_version_id)?;
txn.add_version(parent_version_id, NIL_VERSION_ID, vec![])?;
Ok(client_id)
})?;
@ -512,22 +496,17 @@ mod test {
#[test]
fn get_child_version_found() -> anyhow::Result<()> {
let (server, (client_id, version_id, parent_version_id, history_segment)) = setup(|txn| {
let client_id = Uuid::new_v4();
let version_id = Uuid::new_v4();
let parent_version_id = Uuid::new_v4();
let history_segment = b"abcd".to_vec();
let (server, (client_id, version_id, parent_version_id, history_segment)) =
setup(|txn, client_id| {
let version_id = Uuid::new_v4();
let parent_version_id = Uuid::new_v4();
let history_segment = b"abcd".to_vec();
txn.new_client(client_id, version_id)?;
txn.add_version(
client_id,
version_id,
parent_version_id,
history_segment.clone(),
)?;
txn.new_client(version_id)?;
txn.add_version(version_id, parent_version_id, history_segment.clone())?;
Ok((client_id, version_id, parent_version_id, history_segment))
})?;
Ok((client_id, version_id, parent_version_id, history_segment))
})?;
assert_eq!(
server.get_child_version(client_id, parent_version_id)?,
GetVersionResult::Success {
@ -550,12 +529,9 @@ mod test {
);
// verify that the storage wasn't updated
let mut txn = server.txn()?;
assert_eq!(
txn.get_client(client_id)?.unwrap().latest_version_id,
versions[2]
);
assert_eq!(txn.get_version_by_parent(client_id, versions[2])?, None);
let mut txn = server.txn(client_id)?;
assert_eq!(txn.get_client()?.unwrap().latest_version_id, versions[2]);
assert_eq!(txn.get_version_by_parent(versions[2])?, None);
Ok(())
}
@ -661,13 +637,12 @@ mod test {
#[test]
fn add_snapshot_success_latest() -> anyhow::Result<()> {
let (server, (client_id, version_id)) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, (client_id, version_id)) = setup(|txn, client_id| {
let version_id = Uuid::new_v4();
// set up a task DB with one version in it
txn.new_client(client_id, version_id)?;
txn.add_version(client_id, version_id, NIL_VERSION_ID, vec![])?;
txn.new_client(version_id)?;
txn.add_version(version_id, NIL_VERSION_ID, vec![])?;
// add a snapshot for that version
Ok((client_id, version_id))
@ -675,13 +650,13 @@ mod test {
server.add_snapshot(client_id, version_id, vec![1, 2, 3])?;
// verify the snapshot
let mut txn = server.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = server.txn(client_id)?;
let client = txn.get_client()?.unwrap();
let snapshot = client.snapshot.unwrap();
assert_eq!(snapshot.version_id, version_id);
assert_eq!(snapshot.versions_since, 0);
assert_eq!(
txn.get_snapshot_data(client_id, version_id).unwrap(),
txn.get_snapshot_data(version_id).unwrap(),
Some(vec![1, 2, 3])
);
@ -690,15 +665,14 @@ mod test {
#[test]
fn add_snapshot_success_older() -> anyhow::Result<()> {
let (server, (client_id, version_id_1)) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, (client_id, version_id_1)) = setup(|txn, client_id| {
let version_id_1 = Uuid::new_v4();
let version_id_2 = Uuid::new_v4();
// set up a task DB with two versions in it
txn.new_client(client_id, version_id_2)?;
txn.add_version(client_id, version_id_1, NIL_VERSION_ID, vec![])?;
txn.add_version(client_id, version_id_2, version_id_1, vec![])?;
txn.new_client(version_id_2)?;
txn.add_version(version_id_1, NIL_VERSION_ID, vec![])?;
txn.add_version(version_id_2, version_id_1, vec![])?;
Ok((client_id, version_id_1))
})?;
@ -706,13 +680,13 @@ mod test {
server.add_snapshot(client_id, version_id_1, vec![1, 2, 3])?;
// verify the snapshot
let mut txn = server.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = server.txn(client_id)?;
let client = txn.get_client()?.unwrap();
let snapshot = client.snapshot.unwrap();
assert_eq!(snapshot.version_id, version_id_1);
assert_eq!(snapshot.versions_since, 0);
assert_eq!(
txn.get_snapshot_data(client_id, version_id_1).unwrap(),
txn.get_snapshot_data(version_id_1).unwrap(),
Some(vec![1, 2, 3])
);
@ -721,15 +695,14 @@ mod test {
#[test]
fn add_snapshot_fails_no_such() -> anyhow::Result<()> {
let (server, client_id) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, client_id) = setup(|txn, client_id| {
let version_id_1 = Uuid::new_v4();
let version_id_2 = Uuid::new_v4();
// set up a task DB with two versions in it
txn.new_client(client_id, version_id_2)?;
txn.add_version(client_id, version_id_1, NIL_VERSION_ID, vec![])?;
txn.add_version(client_id, version_id_2, version_id_1, vec![])?;
txn.new_client(version_id_2)?;
txn.add_version(version_id_1, NIL_VERSION_ID, vec![])?;
txn.add_version(version_id_2, version_id_1, vec![])?;
// add a snapshot for unknown version
Ok(client_id)
@ -739,8 +712,8 @@ mod test {
server.add_snapshot(client_id, version_id_unk, vec![1, 2, 3])?;
// verify the snapshot does not exist
let mut txn = server.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = server.txn(client_id)?;
let client = txn.get_client()?.unwrap();
assert!(client.snapshot.is_none());
Ok(())
@ -748,16 +721,15 @@ mod test {
#[test]
fn add_snapshot_fails_too_old() -> anyhow::Result<()> {
let (server, (client_id, version_ids)) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, (client_id, version_ids)) = setup(|txn, client_id| {
let mut version_id = Uuid::new_v4();
let mut parent_version_id = Uuid::nil();
let mut version_ids = vec![];
// set up a task DB with 10 versions in it (oldest to newest)
txn.new_client(client_id, Uuid::nil())?;
txn.new_client(Uuid::nil())?;
for _ in 0..10 {
txn.add_version(client_id, version_id, parent_version_id, vec![])?;
txn.add_version(version_id, parent_version_id, vec![])?;
version_ids.push(version_id);
parent_version_id = version_id;
version_id = Uuid::new_v4();
@ -769,8 +741,8 @@ mod test {
server.add_snapshot(client_id, version_ids[0], vec![1, 2, 3])?;
// verify the snapshot does not exist
let mut txn = server.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = server.txn(client_id)?;
let client = txn.get_client()?.unwrap();
assert!(client.snapshot.is_none());
Ok(())
@ -778,23 +750,21 @@ mod test {
#[test]
fn add_snapshot_fails_newer_exists() -> anyhow::Result<()> {
let (server, (client_id, version_ids)) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, (client_id, version_ids)) = setup(|txn, client_id| {
let mut version_id = Uuid::new_v4();
let mut parent_version_id = Uuid::nil();
let mut version_ids = vec![];
// set up a task DB with 5 versions in it (oldest to newest) and a snapshot of the
// middle one
txn.new_client(client_id, Uuid::nil())?;
txn.new_client(Uuid::nil())?;
for _ in 0..5 {
txn.add_version(client_id, version_id, parent_version_id, vec![])?;
txn.add_version(version_id, parent_version_id, vec![])?;
version_ids.push(version_id);
parent_version_id = version_id;
version_id = Uuid::new_v4();
}
txn.set_snapshot(
client_id,
Snapshot {
version_id: version_ids[2],
versions_since: 2,
@ -810,13 +780,13 @@ mod test {
server.add_snapshot(client_id, version_ids[0], vec![9, 9, 9])?;
// verify the snapshot was not replaced
let mut txn = server.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = server.txn(client_id)?;
let client = txn.get_client()?.unwrap();
let snapshot = client.snapshot.unwrap();
assert_eq!(snapshot.version_id, version_ids[2]);
assert_eq!(snapshot.versions_since, 2);
assert_eq!(
txn.get_snapshot_data(client_id, version_ids[2]).unwrap(),
txn.get_snapshot_data(version_ids[2]).unwrap(),
Some(vec![1, 2, 3])
);
@ -825,11 +795,9 @@ mod test {
#[test]
fn add_snapshot_fails_nil_version() -> anyhow::Result<()> {
let (server, client_id) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, client_id) = setup(|txn, client_id| {
// just set up the client
txn.new_client(client_id, NIL_VERSION_ID)?;
txn.new_client(NIL_VERSION_ID)?;
// add a snapshot for the nil version
Ok(client_id)
@ -838,8 +806,8 @@ mod test {
server.add_snapshot(client_id, NIL_VERSION_ID, vec![9, 9, 9])?;
// verify the snapshot does not exist
let mut txn = server.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = server.txn(client_id)?;
let client = txn.get_client()?.unwrap();
assert!(client.snapshot.is_none());
Ok(())
@ -847,14 +815,12 @@ mod test {
#[test]
fn get_snapshot_found() -> anyhow::Result<()> {
let (server, (client_id, data, snapshot_version_id)) = setup(|txn| {
let client_id = Uuid::new_v4();
let (server, (client_id, data, snapshot_version_id)) = setup(|txn, client_id| {
let data = vec![1, 2, 3];
let snapshot_version_id = Uuid::new_v4();
txn.new_client(client_id, snapshot_version_id)?;
txn.new_client(snapshot_version_id)?;
txn.set_snapshot(
client_id,
Snapshot {
version_id: snapshot_version_id,
versions_since: 3,
@ -874,9 +840,8 @@ mod test {
#[test]
fn get_snapshot_not_found() -> anyhow::Result<()> {
let (server, client_id) = setup(|txn| {
let client_id = Uuid::new_v4();
txn.new_client(client_id, NIL_VERSION_ID)?;
let (server, client_id) = setup(|txn, client_id| {
txn.new_client(NIL_VERSION_ID)?;
Ok(client_id)
})?;

40
core/src/storage.rs
View file

@ -39,48 +39,38 @@ pub struct Version {
/// in storage must be as if each were executed sequentially in some order. In particular,
/// un-committed changes must not be read by another transaction.
///
/// Transactions with different client IDs cannot share any data, so it is safe to handle them
/// concurrently.
///
/// Changes in a transaction that is dropped without calling `commit` must not appear in any other
/// transaction.
pub trait StorageTxn {
/// Get information about the given client
fn get_client(&mut self, client_id: Uuid) -> anyhow::Result<Option<Client>>;
/// Get information about the client for this transaction
fn get_client(&mut self) -> anyhow::Result<Option<Client>>;
/// Create a new client with the given latest_version_id
fn new_client(&mut self, client_id: Uuid, latest_version_id: Uuid) -> anyhow::Result<()>;
/// Create the client for this transaction, with the given latest_version_id. The client must
/// not already exist.
fn new_client(&mut self, latest_version_id: Uuid) -> anyhow::Result<()>;
/// Set the client's most recent snapshot.
fn set_snapshot(
&mut self,
client_id: Uuid,
snapshot: Snapshot,
data: Vec<u8>,
) -> anyhow::Result<()>;
fn set_snapshot(&mut self, snapshot: Snapshot, data: Vec<u8>) -> anyhow::Result<()>;
/// Get the data for the most recent snapshot. The version_id
/// is used to verify that the snapshot is for the correct version.
fn get_snapshot_data(
&mut self,
client_id: Uuid,
version_id: Uuid,
) -> anyhow::Result<Option<Vec<u8>>>;
fn get_snapshot_data(&mut self, version_id: Uuid) -> anyhow::Result<Option<Vec<u8>>>;
/// Get a version, indexed by parent version id
fn get_version_by_parent(
&mut self,
client_id: Uuid,
parent_version_id: Uuid,
) -> anyhow::Result<Option<Version>>;
fn get_version_by_parent(&mut self, parent_version_id: Uuid)
-> anyhow::Result<Option<Version>>;
/// Get a version, indexed by its own version id
fn get_version(&mut self, client_id: Uuid, version_id: Uuid)
-> anyhow::Result<Option<Version>>;
fn get_version(&mut self, version_id: Uuid) -> anyhow::Result<Option<Version>>;
/// Add a version (that must not already exist), and
/// - update latest_version_id
/// - increment snapshot.versions_since
fn add_version(
&mut self,
client_id: Uuid,
version_id: Uuid,
parent_version_id: Uuid,
history_segment: Vec<u8>,
@ -94,6 +84,6 @@ pub trait StorageTxn {
/// A trait for objects able to act as storage. Most of the interesting behavior is in the
/// [`crate::storage::StorageTxn`] trait.
pub trait Storage: Send + Sync {
/// Begin a transaction
fn txn(&self) -> anyhow::Result<Box<dyn StorageTxn + '_>>;
/// Begin a transaction for the given client ID.
fn txn(&self, client_id: Uuid) -> anyhow::Result<Box<dyn StorageTxn + '_>>;
}

10
server/src/api/add_snapshot.rs
View file

@ -70,9 +70,9 @@ mod test {
// set up the storage contents..
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, version_id).unwrap();
txn.add_version(client_id, version_id, NIL_VERSION_ID, vec![])?;
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(version_id).unwrap();
txn.add_version(version_id, NIL_VERSION_ID, vec![])?;
txn.commit()?;
}
@ -114,8 +114,8 @@ mod test {
// set up the storage contents..
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, NIL_VERSION_ID).unwrap();
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(NIL_VERSION_ID).unwrap();
txn.commit().unwrap();
}

20
server/src/api/add_version.rs
View file

@ -82,9 +82,11 @@ pub(crate) async fn service(
}
Err(ServerError::NoSuchClient) => {
// Create a new client and repeat the `add_version` call.
let mut txn = server_state.server.txn().map_err(server_error_to_actix)?;
txn.new_client(client_id, NIL_VERSION_ID)
.map_err(failure_to_ise)?;
let mut txn = server_state
.server
.txn(client_id)
.map_err(server_error_to_actix)?;
txn.new_client(NIL_VERSION_ID).map_err(failure_to_ise)?;
txn.commit().map_err(failure_to_ise)?;
continue;
}
@ -111,8 +113,8 @@ mod test {
// set up the storage contents..
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, Uuid::nil()).unwrap();
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(Uuid::nil()).unwrap();
txn.commit().unwrap();
}
@ -181,8 +183,8 @@ mod test {
// Check that the client really was created
{
let mut txn = server.server_state.server.txn().unwrap();
let client = txn.get_client(client_id).unwrap().unwrap();
let mut txn = server.server_state.server.txn(client_id).unwrap();
let client = txn.get_client().unwrap().unwrap();
assert_eq!(client.latest_version_id, new_version_id);
assert_eq!(client.snapshot, None);
}
@ -197,8 +199,8 @@ mod test {
// set up the storage contents..
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, version_id).unwrap();
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(version_id).unwrap();
txn.commit().unwrap();
}

12
server/src/api/get_child_version.rs
View file

@ -64,9 +64,9 @@ mod test {
// set up the storage contents..
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, Uuid::new_v4()).unwrap();
txn.add_version(client_id, version_id, parent_version_id, b"abcd".to_vec())
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(Uuid::new_v4()).unwrap();
txn.add_version(version_id, parent_version_id, b"abcd".to_vec())
.unwrap();
txn.commit().unwrap();
}
@ -128,9 +128,9 @@ mod test {
// create the client and a single version.
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, Uuid::new_v4()).unwrap();
txn.add_version(client_id, test_version_id, NIL_VERSION_ID, b"vers".to_vec())
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(Uuid::new_v4()).unwrap();
txn.add_version(test_version_id, NIL_VERSION_ID, b"vers".to_vec())
.unwrap();
txn.commit().unwrap();
}

9
server/src/api/get_snapshot.rs
View file

@ -48,8 +48,8 @@ mod test {
// set up the storage contents..
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, Uuid::new_v4()).unwrap();
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(Uuid::new_v4()).unwrap();
txn.commit().unwrap();
}
@ -75,10 +75,9 @@ mod test {
// set up the storage contents..
{
let mut txn = storage.txn().unwrap();
txn.new_client(client_id, Uuid::new_v4()).unwrap();
let mut txn = storage.txn(client_id).unwrap();
txn.new_client(Uuid::new_v4()).unwrap();
txn.set_snapshot(
client_id,
Snapshot {
version_id,
versions_since: 3,

119
sqlite/src/lib.rs
View file

@ -78,12 +78,12 @@ impl SqliteStorage {
}
impl Storage for SqliteStorage {
fn txn<'a>(&'a self) -> anyhow::Result<Box<dyn StorageTxn + 'a>> {
fn txn(&self, client_id: Uuid) -> anyhow::Result<Box<dyn StorageTxn + '_>> {
let con = self.new_connection()?;
// Begin the transaction on this new connection. An IMMEDIATE connection is in
// write (exclusive) mode from the start.
con.execute("BEGIN IMMEDIATE", [])?;
let txn = Txn { con };
let txn = Txn { con, client_id };
Ok(Box::new(txn))
}
}
@ -93,6 +93,7 @@ struct Txn {
// transactions by running `BEGIN ...` and `COMMIT` at appropriate times. So we will do
// the same.
con: Connection,
client_id: Uuid,
}
impl Txn {
@ -126,7 +127,7 @@ impl Txn {
}
impl StorageTxn for Txn {
fn get_client(&mut self, client_id: Uuid) -> anyhow::Result<Option<Client>> {
fn get_client(&mut self) -> anyhow::Result<Option<Client>> {
let result: Option<Client> = self
.con
.query_row(
@ -138,7 +139,7 @@ impl StorageTxn for Txn {
FROM clients
WHERE client_id = ?
LIMIT 1",
[&StoredUuid(client_id)],
[&StoredUuid(self.client_id)],
|r| {
let latest_version_id: StoredUuid = r.get(0)?;
let snapshot_timestamp: Option<i64> = r.get(1)?;
@ -170,22 +171,17 @@ impl StorageTxn for Txn {
Ok(result)
}
fn new_client(&mut self, client_id: Uuid, latest_version_id: Uuid) -> anyhow::Result<()> {
fn new_client(&mut self, latest_version_id: Uuid) -> anyhow::Result<()> {
self.con
.execute(
"INSERT OR REPLACE INTO clients (client_id, latest_version_id) VALUES (?, ?)",
params![&StoredUuid(client_id), &StoredUuid(latest_version_id)],
params![&StoredUuid(self.client_id), &StoredUuid(latest_version_id)],
)
.context("Error creating/updating client")?;
Ok(())
}
fn set_snapshot(
&mut self,
client_id: Uuid,
snapshot: Snapshot,
data: Vec<u8>,
) -> anyhow::Result<()> {
fn set_snapshot(&mut self, snapshot: Snapshot, data: Vec<u8>) -> anyhow::Result<()> {
self.con
.execute(
"UPDATE clients
@ -200,23 +196,19 @@ impl StorageTxn for Txn {
snapshot.timestamp.timestamp(),
snapshot.versions_since,
data,
&StoredUuid(client_id),
&StoredUuid(self.client_id),
],
)
.context("Error creating/updating snapshot")?;
Ok(())
}
fn get_snapshot_data(
&mut self,
client_id: Uuid,
version_id: Uuid,
) -> anyhow::Result<Option<Vec<u8>>> {
fn get_snapshot_data(&mut self, version_id: Uuid) -> anyhow::Result<Option<Vec<u8>>> {
let r = self
.con
.query_row(
"SELECT snapshot, snapshot_version_id FROM clients WHERE client_id = ?",
params![&StoredUuid(client_id)],
params![&StoredUuid(self.client_id)],
|r| {
let v: StoredUuid = r.get("snapshot_version_id")?;
let d: Vec<u8> = r.get("snapshot")?;
@ -237,29 +229,25 @@ impl StorageTxn for Txn {
fn get_version_by_parent(
&mut self,
client_id: Uuid,
parent_version_id: Uuid,
) -> anyhow::Result<Option<Version>> {
self.get_version_impl(
"SELECT version_id, parent_version_id, history_segment FROM versions WHERE parent_version_id = ? AND client_id = ?",
client_id,
self.client_id,
parent_version_id)
}
fn get_version(
&mut self,
client_id: Uuid,
version_id: Uuid,
) -> anyhow::Result<Option<Version>> {
fn get_version(&mut self, version_id: Uuid) -> anyhow::Result<Option<Version>> {
self.get_version_impl(
"SELECT version_id, parent_version_id, history_segment FROM versions WHERE version_id = ? AND client_id = ?",
client_id,
self.client_id,
version_id)
}
fn add_version(
&mut self,
client_id: Uuid,
version_id: Uuid,
parent_version_id: Uuid,
history_segment: Vec<u8>,
@ -268,7 +256,7 @@ impl StorageTxn for Txn {
"INSERT INTO versions (version_id, client_id, parent_version_id, history_segment) VALUES(?, ?, ?, ?)",
params![
StoredUuid(version_id),
StoredUuid(client_id),
StoredUuid(self.client_id),
StoredUuid(parent_version_id),
history_segment
]
@ -281,7 +269,7 @@ impl StorageTxn for Txn {
latest_version_id = ?,
versions_since_snapshot = versions_since_snapshot + 1
WHERE client_id = ?",
params![StoredUuid(version_id), StoredUuid(client_id),],
params![StoredUuid(version_id), StoredUuid(self.client_id),],
)
.context("Error updating client for new version")?;
@ -306,8 +294,9 @@ mod test {
let tmp_dir = TempDir::new()?;
let non_existant = tmp_dir.path().join("subdir");
let storage = SqliteStorage::new(non_existant)?;
let mut txn = storage.txn()?;
let maybe_client = txn.get_client(Uuid::new_v4())?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
let maybe_client = txn.get_client()?;
assert!(maybe_client.is_none());
Ok(())
}
@ -316,8 +305,9 @@ mod test {
fn test_get_client_empty() -> anyhow::Result<()> {
let tmp_dir = TempDir::new()?;
let storage = SqliteStorage::new(tmp_dir.path())?;
let mut txn = storage.txn()?;
let maybe_client = txn.get_client(Uuid::new_v4())?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
let maybe_client = txn.get_client()?;
assert!(maybe_client.is_none());
Ok(())
}
@ -326,20 +316,20 @@ mod test {
fn test_client_storage() -> anyhow::Result<()> {
let tmp_dir = TempDir::new()?;
let storage = SqliteStorage::new(tmp_dir.path())?;
let mut txn = storage.txn()?;
let client_id = Uuid::new_v4();
let latest_version_id = Uuid::new_v4();
txn.new_client(client_id, latest_version_id)?;
let mut txn = storage.txn(client_id)?;
let client = txn.get_client(client_id)?.unwrap();
let latest_version_id = Uuid::new_v4();
txn.new_client(latest_version_id)?;
let client = txn.get_client()?.unwrap();
assert_eq!(client.latest_version_id, latest_version_id);
assert!(client.snapshot.is_none());
let latest_version_id = Uuid::new_v4();
txn.add_version(client_id, latest_version_id, Uuid::new_v4(), vec![1, 1])?;
txn.add_version(latest_version_id, Uuid::new_v4(), vec![1, 1])?;
let client = txn.get_client(client_id)?.unwrap();
let client = txn.get_client()?.unwrap();
assert_eq!(client.latest_version_id, latest_version_id);
assert!(client.snapshot.is_none());
@ -348,9 +338,9 @@ mod test {
timestamp: "2014-11-28T12:00:09Z".parse::<DateTime<Utc>>().unwrap(),
versions_since: 4,
};
txn.set_snapshot(client_id, snap.clone(), vec![1, 2, 3])?;
txn.set_snapshot(snap.clone(), vec![1, 2, 3])?;
let client = txn.get_client(client_id)?.unwrap();
let client = txn.get_client()?.unwrap();
assert_eq!(client.latest_version_id, latest_version_id);
assert_eq!(client.snapshot.unwrap(), snap);
@ -361,8 +351,9 @@ mod test {
fn test_gvbp_empty() -> anyhow::Result<()> {
let tmp_dir = TempDir::new()?;
let storage = SqliteStorage::new(tmp_dir.path())?;
let mut txn = storage.txn()?;
let maybe_version = txn.get_version_by_parent(Uuid::new_v4(), Uuid::new_v4())?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
let maybe_version = txn.get_version_by_parent(Uuid::new_v4())?;
assert!(maybe_version.is_none());
Ok(())
}
@ -371,18 +362,13 @@ mod test {
fn test_add_version_and_get_version() -> anyhow::Result<()> {
let tmp_dir = TempDir::new()?;
let storage = SqliteStorage::new(tmp_dir.path())?;
let mut txn = storage.txn()?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
let version_id = Uuid::new_v4();
let parent_version_id = Uuid::new_v4();
let history_segment = b"abc".to_vec();
txn.add_version(
client_id,
version_id,
parent_version_id,
history_segment.clone(),
)?;
txn.add_version(version_id, parent_version_id, history_segment.clone())?;
let expected = Version {
version_id,
@ -390,12 +376,10 @@ mod test {
history_segment,
};
let version = txn
.get_version_by_parent(client_id, parent_version_id)?
.unwrap();
let version = txn.get_version_by_parent(parent_version_id)?.unwrap();
assert_eq!(version, expected);
let version = txn.get_version(client_id, version_id)?.unwrap();
let version = txn.get_version(version_id)?.unwrap();
assert_eq!(version, expected);
Ok(())
@ -405,41 +389,40 @@ mod test {
fn test_snapshots() -> anyhow::Result<()> {
let tmp_dir = TempDir::new()?;
let storage = SqliteStorage::new(tmp_dir.path())?;
let mut txn = storage.txn()?;
let client_id = Uuid::new_v4();
let mut txn = storage.txn(client_id)?;
txn.new_client(client_id, Uuid::new_v4())?;
assert!(txn.get_client(client_id)?.unwrap().snapshot.is_none());
txn.new_client(Uuid::new_v4())?;
assert!(txn.get_client()?.unwrap().snapshot.is_none());
let snap = Snapshot {
version_id: Uuid::new_v4(),
timestamp: "2013-10-08T12:00:09Z".parse::<DateTime<Utc>>().unwrap(),
versions_since: 3,
};
txn.set_snapshot(client_id, snap.clone(), vec![9, 8, 9])?;
txn.set_snapshot(snap.clone(), vec![9, 8, 9])?;
assert_eq!(
txn.get_snapshot_data(client_id, snap.version_id)?.unwrap(),
txn.get_snapshot_data(snap.version_id)?.unwrap(),
vec![9, 8, 9]
);
assert_eq!(txn.get_client(client_id)?.unwrap().snapshot, Some(snap));
assert_eq!(txn.get_client()?.unwrap().snapshot, Some(snap));
let snap2 = Snapshot {
version_id: Uuid::new_v4(),
timestamp: "2014-11-28T12:00:09Z".parse::<DateTime<Utc>>().unwrap(),
versions_since: 10,
};
txn.set_snapshot(client_id, snap2.clone(), vec![0, 2, 4, 6])?;
txn.set_snapshot(snap2.clone(), vec![0, 2, 4, 6])?;
assert_eq!(
txn.get_snapshot_data(client_id, snap2.version_id)?.unwrap(),
txn.get_snapshot_data(snap2.version_id)?.unwrap(),
vec![0, 2, 4, 6]
);
assert_eq!(txn.get_client(client_id)?.unwrap().snapshot, Some(snap2));
assert_eq!(txn.get_client()?.unwrap().snapshot, Some(snap2));
// check that mismatched version is detected
assert!(txn.get_snapshot_data(client_id, Uuid::new_v4()).is_err());
assert!(txn.get_snapshot_data(Uuid::new_v4()).is_err());
Ok(())
}

18
sqlite/tests/concurrency.rs
View file

@ -12,8 +12,8 @@ fn add_version_concurrency() -> anyhow::Result<()> {
{
let con = SqliteStorage::new(tmp_dir.path())?;
let mut txn = con.txn()?;
txn.new_client(client_id, NIL_VERSION_ID)?;
let mut txn = con.txn(client_id)?;
txn.new_client(NIL_VERSION_ID)?;
txn.commit()?;
}
@ -25,12 +25,12 @@ fn add_version_concurrency() -> anyhow::Result<()> {
let con = SqliteStorage::new(tmp_dir.path())?;
for _ in 0..N {
let mut txn = con.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = con.txn(client_id)?;
let client = txn.get_client()?.unwrap();
let version_id = Uuid::new_v4();
let parent_version_id = client.latest_version_id;
std::thread::yield_now(); // Make failure more likely.
txn.add_version(client_id, version_id, parent_version_id, b"data".to_vec())?;
txn.add_version(version_id, parent_version_id, b"data".to_vec())?;
txn.commit()?;
}
@ -49,15 +49,13 @@ fn add_version_concurrency() -> anyhow::Result<()> {
// same `parent_version_id`.
{
let con = SqliteStorage::new(tmp_dir.path())?;
let mut txn = con.txn()?;
let client = txn.get_client(client_id)?.unwrap();
let mut txn = con.txn(client_id)?;
let client = txn.get_client()?.unwrap();
let mut n = 0;
let mut version_id = client.latest_version_id;
while version_id != NIL_VERSION_ID {
let version = txn
.get_version(client_id, version_id)?
.expect("version should exist");
let version = txn.get_version(version_id)?.expect("version should exist");
n += 1;
version_id = version.parent_version_id;
}