use std::ops::Bound;
use bytes::Bytes;
use crate::LixError;
use crate::init::{REPOSITORY_PROTOCOL_KEY, REPOSITORY_PROTOCOL_SPACE, REPOSITORY_PROTOCOL_VALUE};
use crate::storage_adapter::{
PutBatch, PutEntry, Storage, StorageError, StorageKey as Key, StorageKeyRange as KeyRange,
StoragePrecondition as Precondition, StorageSpace, StorageValue as StoredValue, StorageWrite,
StorageWriteOptions as WriteOptions, ValueSemantics, StorageAdapter,
};
#[derive(Debug)]
pub(super) struct PublicationPlan {
replacements: Vec<(StorageSpace, PutBatch)>,
mutable_puts: Vec<(StorageSpace, PutBatch)>,
cleared_spaces: Vec<StorageSpace>,
max_entries: usize,
max_bytes: usize,
entries: usize,
bytes: usize,
}
impl PublicationPlan {
pub(super) fn bounded(max_entries: usize, max_bytes: usize) -> Self {
Self {
replacements: Vec::new(),
mutable_puts: Vec::new(),
cleared_spaces: Vec::new(),
max_entries,
max_bytes,
entries: 0,
bytes: 0,
}
}
pub(super) fn replace_immutable(
&mut self,
space: StorageSpace,
entries: Vec<(Vec<u8>, Vec<u8>)>,
) -> Result<(), LixError> {
if space.value_semantics != ValueSemantics::Immutable {
return Err(plan_error("immutable replacement targeted a mutable space"));
}
let batch = put_batch(entries)?;
self.account(&batch)?;
self.replacements.push((space, batch));
Ok(())
}
fn account(&mut self, batch: &PutBatch) -> Result<(), LixError> {
let entries = batch.entries.len();
let bytes = batch
.entries
.iter()
.try_fold(0usize, |total, entry| {
total
.checked_add(entry.key.0.len())?
.checked_add(entry.value.bytes.len())
})
.ok_or_else(|| plan_error("migration publication size overflows usize"))?;
self.entries = self
.entries
.checked_add(entries)
.ok_or_else(|| plan_error("migration publication entry count overflows usize"))?;
self.bytes = self
.bytes
.checked_add(bytes)
.ok_or_else(|| plan_error("migration publication bytes overflow usize"))?;
if self.entries > self.max_entries || self.bytes > self.max_bytes {
return Err(LixError::new(
"LIX_ERROR_MIGRATION_LIMIT_EXCEEDED",
format!(
"migration publication exceeds configured bounds: {} entries, {} bytes",
self.entries, self.bytes
),
));
}
Ok(())
}
}
impl Default for PublicationPlan {
fn default() -> Self {
Self::bounded(usize::MAX, usize::MAX)
}
}
pub(super) async fn publish<S>(
storage: &StorageAdapter<S>,
expected_mutation_revision: Option<Bytes>,
expected_protocol_value: &'static [u8],
target_protocol_value: &'static [u8],
plan: PublicationPlan,
) -> Result<(), LixError>
where
S: Storage,
{
let marker_batch = put_batch(vec![(
REPOSITORY_PROTOCOL_KEY.to_vec(),
target_protocol_value.to_vec(),
)])?;
let mut write = storage
.begin_migration_write(WriteOptions {
await_durable: true,
preconditions: vec![
Precondition::KeyValueEquals {
space: REPOSITORY_PROTOCOL_SPACE,
key: Key(Bytes::from_static(REPOSITORY_PROTOCOL_KEY)),
expected: Bytes::from_static(expected_protocol_value),
},
StorageAdapter::<S>::mutation_revision_precondition(
expected_mutation_revision,
),
],
..WriteOptions::default()
})
.await
.map_err(storage_error)?;
let stage_result: Result<(), StorageError> = async {
for space in plan.cleared_spaces {
write
.delete_range(
space,
KeyRange {
lower: Bound::Unbounded,
upper: Bound::Unbounded,
},
)
.await?;
}
for (space, entries) in plan.replacements {
write.replace_many(space, entries).await?;
}
for (space, entries) in plan.mutable_puts {
write.put_many(space, entries).await?;
}
write
.put_many(REPOSITORY_PROTOCOL_SPACE, marker_batch)
.await?;
crate::storage_adapter::stage_mutation_revision(&mut write).await?;
Ok(())
}
.await;
if let Err(error) = stage_result {
let mapped = storage_error(error);
let _ = write.rollback().await;
return Err(mapped);
}
write.commit().await.map_err(storage_error)?;
Ok(())
}
fn put_batch(mut entries: Vec<(Vec<u8>, Vec<u8>)>) -> Result<PutBatch, LixError> {
entries.sort_unstable_by(|left, right| left.0.cmp(&right.0));
if entries.windows(2).any(|pair| pair[0].0 == pair[1].0) {
return Err(plan_error(
"migration plan contains a duplicate physical key",
));
}
Ok(PutBatch {
entries: entries
.into_iter()
.map(|(key, value)| PutEntry {
key: Key(Bytes::from(key)),
value: StoredValue {
bytes: Bytes::from(value),
},
})
.collect(),
})
}
fn plan_error(message: impl Into<String>) -> LixError {
LixError::new(LixError::CODE_INTERNAL_ERROR, message.into())
}
fn storage_error(error: StorageError) -> LixError {
let code = match &error {
StorageError::CommitOutcomeUnknown(_) => "LIX_ERROR_MIGRATION_COMMIT_OUTCOME_UNKNOWN",
StorageError::PreconditionFailed(_)
| StorageError::WriteConflict
| StorageError::Fenced => "LIX_ERROR_MIGRATION_CONCURRENT_MUTATION",
_ => LixError::CODE_INTERNAL_ERROR,
};
LixError::new(code, format!("repository migration storage error: {error}"))
}
#[cfg(test)]
mod tests {
use super::*;
use crate::init::CURRENT_FORMAT_VERSION;
use crate::storage::{
CoreProjection, GetManyRequest, GetOptions, Memory, ProjectedValue, ReadOptions,
StorageRead,
};
const IMMUTABLE: StorageSpace = crate::tracked_state::TRACKED_STATE_COMMIT_DELTA_SEGMENT_SPACE;
#[tokio::test]
async fn replaces_immutable_bytes_and_marker_atomically() {
let storage = Memory::new();
let mut seed = storage.begin_write(WriteOptions::default()).await.unwrap();
seed.put_many(
IMMUTABLE,
put_batch(vec![(b"same-key".to_vec(), b"v68".to_vec())]).unwrap(),
)
.await
.unwrap();
seed.put_many(
REPOSITORY_PROTOCOL_SPACE,
put_batch(vec![(
REPOSITORY_PROTOCOL_KEY.to_vec(),
b"tracked-default-branch.v68".to_vec(),
)])
.unwrap(),
)
.await
.unwrap();
seed.commit().await.unwrap();
let mut plan = PublicationPlan::default();
plan.replace_immutable(IMMUTABLE, vec![(b"same-key".to_vec(), b"v69".to_vec())])
.unwrap();
let adapter = StorageAdapter::new(storage.clone());
let revision = adapter.load_mutation_revision().await.unwrap();
publish(
&adapter,
revision,
b"tracked-default-branch.v68",
REPOSITORY_PROTOCOL_VALUE,
plan,
)
.await
.unwrap();
let read = storage.begin_read(ReadOptions::default()).await.unwrap();
let immutable_keys = [Key(Bytes::from_static(b"same-key"))];
let marker_keys = [Key(Bytes::from_static(REPOSITORY_PROTOCOL_KEY))];
let result = read
.get_many(&[
GetManyRequest {
space: IMMUTABLE,
keys: &immutable_keys,
opts: GetOptions {
projection: CoreProjection::FullValue,
},
},
GetManyRequest {
space: REPOSITORY_PROTOCOL_SPACE,
keys: &marker_keys,
opts: GetOptions {
projection: CoreProjection::FullValue,
},
},
])
.await
.unwrap();
assert_eq!(
result.values,
vec![
Some(ProjectedValue::FullValue(Bytes::from_static(b"v69"))),
Some(ProjectedValue::FullValue(Bytes::from_static(
REPOSITORY_PROTOCOL_VALUE
))),
]
);
}
#[tokio::test]
async fn mutation_revision_fences_a_stale_preflight() {
let storage = Memory::new();
let mut seed = storage.begin_write(WriteOptions::default()).await.unwrap();
seed.put_many(
REPOSITORY_PROTOCOL_SPACE,
put_batch(vec![(
REPOSITORY_PROTOCOL_KEY.to_vec(),
b"tracked-default-branch.v68".to_vec(),
)])
.unwrap(),
)
.await
.unwrap();
seed.commit().await.unwrap();
let adapter = StorageAdapter::new(storage.clone());
let stale_revision = adapter.load_mutation_revision().await.unwrap();
let mut concurrent = adapter.new_write_set();
concurrent.put(REPOSITORY_PROTOCOL_SPACE, &b"unrelated"[..], &b"write"[..]);
adapter
.commit_write_set(concurrent, WriteOptions::default())
.await
.unwrap();
let error = publish(
&adapter,
stale_revision,
b"tracked-default-branch.v68",
REPOSITORY_PROTOCOL_VALUE,
PublicationPlan::default(),
)
.await
.expect_err("stale migration must be fenced");
assert!(error.to_string().contains("precondition failed"));
assert_eq!(
crate::migration::inspect_lix(&storage)
.await
.unwrap(),
crate::migration::MigrationStatus::Required {
from_version: 68,
to_version: CURRENT_FORMAT_VERSION,
}
);
}
}