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// SPDX-License-Identifier: BUSL-1.1
//! Bitemporal write paths on `EdgeStore`:
//! `put_edge_versioned`, `soft_delete_edge`, `gdpr_erase_edge`.
use redb::ReadableTable;
use super::keys::{
EdgeRef, GDPR_ERASURE_SENTINEL, TOMBSTONE_SENTINEL, edge_version_prefix, is_sentinel,
versioned_edge_key,
};
use super::payload::EdgeValuePayload;
use crate::engine::graph::edge_store::stats::table::{GRAPH_STATS, SummaryRow, summary_key};
use crate::engine::graph::edge_store::stats::update::{
EdgeStatsKey, decrement_for_delete, increment_for_insert,
};
use crate::engine::graph::edge_store::store::{EDGES, EdgeStore, REVERSE_EDGES, redb_err};
impl EdgeStore {
/// Write a new version of an edge at `system_from`. Maintains
/// the reverse index with the same suffix so inbound traversal can
/// version-scan symmetrically.
///
/// Does NOT close prior versions' `system_until` — Ceiling infers the
/// closed-open interval at read time from the next-newer version's
/// `system_from`.
pub fn put_edge_versioned(
&self,
edge: EdgeRef<'_>,
properties: &[u8],
system_from: i64,
valid_from_ms: i64,
valid_until_ms: i64,
) -> crate::Result<()> {
self.put_edge_versioned_with_stats(
edge,
properties,
system_from,
valid_from_ms,
valid_until_ms,
true,
)
}
/// Write a version while allowing a dual-home replica to skip logical
/// cardinality accounting. Cross-vShard graph writes persist the same edge
/// on both endpoint homes for OUT and IN traversal, but only the source home
/// owns the logical edge for global statistics.
pub fn put_edge_versioned_with_stats(
&self,
edge: EdgeRef<'_>,
properties: &[u8],
system_from: i64,
valid_from_ms: i64,
valid_until_ms: i64,
account_stats: bool,
) -> crate::Result<()> {
let fwd = versioned_edge_key(edge.collection, edge.src, edge.label, edge.dst, system_from)?;
let rev = versioned_edge_key(edge.collection, edge.dst, edge.label, edge.src, system_from)?;
let payload =
EdgeValuePayload::new(valid_from_ms, valid_until_ms, properties.to_vec()).encode()?;
let d = edge.db.as_u64();
let t = edge.tid.as_u64();
let write_txn = self
.db
.begin_write()
.map_err(|e| redb_err("begin_write", e))?;
{
let mut edges = write_txn
.open_table(EDGES)
.map_err(|e| redb_err("open edges", e))?;
edges
.insert((d, t, fwd.as_str()), payload.as_slice())
.map_err(|e| redb_err("insert versioned edge", e))?;
drop(edges);
let mut rev_t = write_txn
.open_table(REVERSE_EDGES)
.map_err(|e| redb_err("open reverse", e))?;
rev_t
.insert((d, t, rev.as_str()), &[] as &[u8])
.map_err(|e| redb_err("insert reverse", e))?;
drop(rev_t);
if account_stats {
increment_for_insert(
&write_txn,
EdgeStatsKey {
db: d,
tid: t,
collection: edge.collection,
label: edge.label,
src: edge.src,
dst: edge.dst,
},
system_from,
)?;
} else {
// Suppress the lazy edge-scan rebuild on a destination-only
// replica: absence of a summary means "legacy stats missing",
// while an explicit zero summary means "this shard owns no
// logical edges for this collection". Preserve an existing
// nonzero summary because this core may canonically own other
// source-homed edges in the same collection.
let key = summary_key(edge.collection);
let mut stats = write_txn
.open_table(GRAPH_STATS)
.map_err(|e| redb_err("open graph_stats", e))?;
if stats
.get((d, t, key.as_str()))
.map_err(|e| redb_err("read graph summary", e))?
.is_none()
{
let zero = SummaryRow::zero().encode()?;
stats
.insert((d, t, key.as_str()), zero.as_slice())
.map_err(|e| redb_err("insert zero graph summary", e))?;
}
}
}
write_txn.commit().map_err(|e| redb_err("commit", e))?;
Ok(())
}
/// BiTemporalFK enforcement: close a referrer edge by appending a new
/// version that copies the latest live version's properties and
/// `valid_from_ms`, but bounds `valid_until_ms` to `now`. Preserves
/// historical truth — the edge existed in valid time `[valid_from, now)`.
///
/// Returns `Ok(false)` when no live version exists (already closed,
/// tombstoned, GDPR-erased, or never written) — the caller may treat
/// this as a no-op.
pub fn close_referrer_edge(
&self,
edge: EdgeRef<'_>,
system_from: i64,
now_valid_ms: i64,
) -> crate::Result<bool> {
let prefix = edge_version_prefix(edge.collection, edge.src, edge.label, edge.dst);
let upper =
versioned_edge_key(edge.collection, edge.src, edge.label, edge.dst, system_from)?;
let d = edge.db.as_u64();
let t = edge.tid.as_u64();
let prior = {
let read_txn = self
.db
.begin_read()
.map_err(|e| redb_err("begin_read", e))?;
let table = read_txn
.open_table(EDGES)
.map_err(|e| redb_err("open edges", e))?;
let range = table
.range((d, t, prefix.as_str())..=(d, t, upper.as_str()))
.map_err(|e| redb_err("close referrer range", e))?;
let mut found: Option<EdgeValuePayload> = None;
for entry in range.rev() {
let (k, v) = entry.map_err(|e| redb_err("close referrer iter", e))?;
let (kd, kt, composite) = k.value();
if kd != d || kt != t || !composite.starts_with(&prefix) {
break;
}
let bytes = v.value();
if is_sentinel(bytes) {
return Ok(false);
}
let payload = EdgeValuePayload::decode(bytes)?;
if payload.valid_from_ms <= now_valid_ms && now_valid_ms < payload.valid_until_ms {
found = Some(payload);
break;
}
}
match found {
Some(p) => p,
None => return Ok(false),
}
};
self.put_edge_versioned(
edge,
&prior.properties,
system_from,
prior.valid_from_ms,
now_valid_ms,
)?;
Ok(true)
}
/// Append a tombstone version at `system_from`.
pub fn soft_delete_edge(&self, edge: EdgeRef<'_>, system_from: i64) -> crate::Result<()> {
self.write_sentinel(edge, system_from, TOMBSTONE_SENTINEL, true)
}
/// Append a tombstone without double-decrementing global statistics on the
/// destination-home replica of a dual-homed edge.
pub fn soft_delete_edge_with_stats(
&self,
edge: EdgeRef<'_>,
system_from: i64,
account_stats: bool,
) -> crate::Result<()> {
self.write_sentinel(edge, system_from, TOMBSTONE_SENTINEL, account_stats)
}
/// Append a GDPR-erasure version — distinct from a soft-delete so audits
/// can distinguish user-visible removal from regulatory erasure.
pub fn gdpr_erase_edge(&self, edge: EdgeRef<'_>, system_from: i64) -> crate::Result<()> {
self.write_sentinel(edge, system_from, GDPR_ERASURE_SENTINEL, true)
}
fn write_sentinel(
&self,
edge: EdgeRef<'_>,
system_from: i64,
sentinel: &[u8],
account_stats: bool,
) -> crate::Result<()> {
debug_assert!(
is_sentinel(sentinel),
"write_sentinel called with non-sentinel bytes"
);
let fwd = versioned_edge_key(edge.collection, edge.src, edge.label, edge.dst, system_from)?;
let rev = versioned_edge_key(edge.collection, edge.dst, edge.label, edge.src, system_from)?;
let d = edge.db.as_u64();
let t = edge.tid.as_u64();
let write_txn = self
.db
.begin_write()
.map_err(|e| redb_err("begin_write", e))?;
{
let mut edges = write_txn
.open_table(EDGES)
.map_err(|e| redb_err("open edges", e))?;
edges
.insert((d, t, fwd.as_str()), sentinel)
.map_err(|e| redb_err("insert sentinel edge", e))?;
drop(edges);
let mut rev_t = write_txn
.open_table(REVERSE_EDGES)
.map_err(|e| redb_err("open reverse", e))?;
rev_t
.insert((d, t, rev.as_str()), sentinel)
.map_err(|e| redb_err("insert sentinel reverse", e))?;
drop(rev_t);
if account_stats {
decrement_for_delete(
&write_txn,
EdgeStatsKey {
db: d,
tid: t,
collection: edge.collection,
label: edge.label,
src: edge.src,
dst: edge.dst,
},
system_from,
)?;
}
}
write_txn
.commit()
.map_err(|e| redb_err("commit sentinel", e))?;
Ok(())
}
}