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//! Atomic, lease-fenced terminal process completion.
use super::process_registry::{process_lease_expired, tx_outcome};
use super::*;
/// Unleased terminal completion, validated and appended as one atomic unit.
///
/// The load, the authority-vs-disposition validation, and the terminal append
/// all run inside a single `write_flow` transaction. Splitting validation
/// (reading the row's `disposition`) from the append leaves a window in which a
/// paused caller could re-validate against one disposition, then append after
/// the row was completed, pruned, and re-registered with a *different*
/// disposition. Holding one transaction across load→validate→append closes that
/// window: the row we validate is the row we append to.
pub(super) async fn complete_process(
registry: &SqliteProcessRegistry,
process_id: &str,
await_output: ProcessAwaitOutput,
authority: lash_core::ProcessCompletionAuthority,
) -> Result<ProcessRecord, lash_core::PluginError> {
let process_id = process_id.to_string();
registry
.conn
.write_flow(move |tx| {
Ok(tx_outcome((|| {
let mut record = SqliteProcessRegistry::load_process_conn(tx, &process_id)?
.ok_or_else(|| {
lash_core::PluginError::Session(format!("unknown process `{process_id}`"))
})?;
// Validate the authority against the row's declared disposition
// *inside* the transaction that appends, so a concurrent
// complete→prune→re-register with a different disposition cannot
// slip between the check and the append.
authority.validate(&process_id, record.disposition, &await_output)?;
let request =
lash_core::terminal_append_request(&process_id, &await_output, Some(&authority));
let replay_lookup = request
.replay
.as_ref()
.map(|replay| {
SqliteProcessRegistry::load_event_by_key_conn(
tx,
&process_id,
replay.key.as_str(),
)
})
.transpose()?
.flatten();
let sequence = tx
.query_row(
"SELECT COALESCE(MAX(sequence), 0) + 1 FROM process_events WHERE process_id = ?1",
params![process_id],
|row| row.get::<_, i64>(0),
)
.map_err(process_sqlite_error)? as u64;
let now = current_epoch_ms();
let prepared =
prepare_process_event_append(&record, request, sequence, replay_lookup, now)?;
match prepared {
lash_core::ProcessEventAppendPlan::Replay {
repair_status,
occurred_at_ms,
..
} => {
if let Some(status) = repair_status {
lash_core::apply_process_status_projection(
&mut record,
status,
occurred_at_ms,
);
SqliteProcessRegistry::save_process_conn(tx, &record)?;
}
Ok(record)
}
lash_core::ProcessEventAppendPlan::Insert {
event,
payload_hash,
status_update,
occurred_at_ms,
..
} => {
tx.execute(
"INSERT INTO process_events (
process_id, sequence, event_type, payload_hash, idempotency_key,
occurred_at_ms, event_json
) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)",
params![
process_id,
sequence as i64,
event.event_type.as_str(),
payload_hash.as_str(),
event.invocation.replay_key(),
occurred_at_ms as i64,
process_encode_json(&event)?,
],
)
.map_err(process_sqlite_error)?;
if let Some(status) = status_update {
lash_core::apply_process_status_projection(
&mut record,
status,
occurred_at_ms,
);
} else {
record.updated_at_ms = occurred_at_ms;
}
SqliteProcessRegistry::save_process_conn(tx, &record)?;
Ok(record)
}
}
})()))
})
.await
.map_err(process_sqlite_error)?
}
pub(super) async fn complete_process_with_lease(
registry: &SqliteProcessRegistry,
lease: &ProcessLease,
await_output: ProcessAwaitOutput,
) -> Result<ProcessRecord, lash_core::PluginError> {
let lease = lease.clone();
registry.conn
.write_flow(move |tx| {
Ok(tx_outcome((|| {
let process_id = lease.process_id.as_str();
let mut record = SqliteProcessRegistry::load_process_conn(tx, process_id)?.ok_or_else(|| {
lash_core::PluginError::Session(format!(
"unknown process `{process_id}`"
))
})?;
let request = lash_core::terminal_append_request(process_id, &await_output, None);
let replay_lookup = request
.replay
.as_ref()
.map(|replay| {
SqliteProcessRegistry::load_event_by_key_conn(tx, process_id, replay.key.as_str())
})
.transpose()?
.flatten();
let sequence = tx
.query_row(
"SELECT COALESCE(MAX(sequence), 0) + 1 FROM process_events WHERE process_id = ?1",
params![process_id],
|row| row.get::<_, i64>(0),
)
.map_err(process_sqlite_error)? as u64;
let now = current_epoch_ms();
// A successful prior terminal append is replay-idempotent even
// though that transaction already cleared the lease.
let prepared = prepare_process_event_append(
&record,
request,
sequence,
replay_lookup,
now,
)?;
if matches!(prepared, lash_core::ProcessEventAppendPlan::Replay { .. }) {
return Ok(record);
}
let current = SqliteProcessRegistry::load_process_lease_conn(tx, process_id)?;
if !guard_lease(current.as_ref(), &lease.lease_token, now)
|| !current.as_ref().is_some_and(|current| {
current.owner.same_incarnation(&lease.owner)
&& current.fencing_token == lease.fencing_token
})
{
return Err(process_lease_expired(process_id));
}
let lash_core::ProcessEventAppendPlan::Insert {
event,
payload_hash,
status_update,
occurred_at_ms,
..
} = prepared
else {
unreachable!("replay returned above")
};
tx.execute(
"INSERT INTO process_events (
process_id, sequence, event_type, payload_hash, idempotency_key,
occurred_at_ms, event_json
) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)",
params![
process_id,
sequence as i64,
event.event_type.as_str(),
payload_hash.as_str(),
event.invocation.replay_key(),
occurred_at_ms as i64,
process_encode_json(&event)?,
],
)
.map_err(process_sqlite_error)?;
if let Some(status) = status_update {
lash_core::apply_process_status_projection(
&mut record,
status,
occurred_at_ms,
);
}
SqliteProcessRegistry::save_process_conn(tx, &record)?;
tx.execute(
"UPDATE process_leases
SET lease_owner_id = NULL,
lease_owner_incarnation_id = NULL,
lease_owner_liveness_json = NULL,
lease_token = NULL,
lease_claimed_at_ms = 0,
lease_expires_at_ms = 0
WHERE process_id = ?1
AND lease_token = ?2
AND lease_fencing_token = ?3",
params![process_id, lease.lease_token, lease.fencing_token as i64],
)
.map_err(process_sqlite_error)?;
Ok(record)
})()))
})
.await
.map_err(process_sqlite_error)?
}