oxgraph-postgres 0.2.0

Postgres-backed OxGraph engine: catalog, build, artifact I/O, query, sync.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

//! Characterization pins for build, catalog, and sync before structural refactors.

use core::num::NonZeroUsize;

use oxgraph_postgres::{
    Catalog, CatalogError, EdgeId, EdgeRow, EngineBuilder, NodeKey, OverlayEdge, OverlayState,
    RegisteredEdge, RegisteredTable, SnapshotRebuild, SyncAction, SyncRow, TableId,
};

const LIMIT_10: NonZeroUsize = NonZeroUsize::new(10).unwrap();

#[test]
fn snapshot_rebuild_roundtrip_status() -> Result<(), oxgraph_postgres::PostgresGraphError> {
    let mut catalog = Catalog::new();
    catalog.add_table(RegisteredTable {
        id: TableId(1),
        schema: "public".into(),
        name: "nodes".into(),
        primary_key_column: "id".into(),
    })?;
    let edges = [
        EdgeRow {
            source: NodeKey::registered(TableId(1), 1),
            target: NodeKey::registered(TableId(1), 2),
        },
        EdgeRow {
            source: NodeKey::registered(TableId(1), 2),
            target: NodeKey::registered(TableId(1), 3),
        },
    ];
    let bytes = SnapshotRebuild::from_catalog_and_edges(&catalog, &edges, 1_700_000_000)?;
    let engine = EngineBuilder::new().snapshot_owned(bytes).build()?;
    assert_eq!(engine.status().node_count, 3);
    assert_eq!(engine.status().edge_count, 2);
    Ok(())
}

#[test]
fn catalog_rejects_duplicate_table_id() -> Result<(), CatalogError> {
    let mut catalog = Catalog::new();
    let table = RegisteredTable {
        id: TableId(1),
        schema: "public".into(),
        name: "a".into(),
        primary_key_column: "id".into(),
    };
    catalog.add_table(table.clone())?;
    assert_eq!(
        catalog.add_table(table),
        Err(CatalogError::DuplicateTableId(TableId(1)))
    );
    Ok(())
}

#[test]
fn catalog_rejects_duplicate_table_name() -> Result<(), CatalogError> {
    let mut catalog = Catalog::new();
    catalog.add_table(RegisteredTable {
        id: TableId(1),
        schema: "public".into(),
        name: "nodes".into(),
        primary_key_column: "id".into(),
    })?;
    assert_eq!(
        catalog.add_table(RegisteredTable {
            id: TableId(2),
            schema: "public".into(),
            name: "nodes".into(),
            primary_key_column: "id".into(),
        }),
        Err(CatalogError::DuplicateTableName {
            schema: "public".into(),
            name: "nodes".into(),
        })
    );
    Ok(())
}

#[test]
fn catalog_rejects_edge_with_missing_endpoint() -> Result<(), CatalogError> {
    let mut catalog = Catalog::new();
    catalog.add_table(RegisteredTable {
        id: TableId(1),
        schema: "public".into(),
        name: "nodes".into(),
        primary_key_column: "id".into(),
    })?;
    assert_eq!(
        catalog.add_edge(RegisteredEdge {
            id: EdgeId(1),
            source_table: TableId(9),
            target_table: TableId(1),
            source_column: "src".into(),
            target_column: "dst".into(),
            schema: "public".into(),
            name: "edges".into(),
        }),
        Err(CatalogError::MissingTable(TableId(9)))
    );
    Ok(())
}

#[test]
fn sync_apply_in_order_rejects_non_monotonic_sequence() {
    let mut overlay = OverlayState::default();
    let rows = [
        SyncRow {
            sequence: 2,
            action: SyncAction::InsertEdge {
                source: 0,
                target: 1,
            },
        },
        SyncRow {
            sequence: 2,
            action: SyncAction::DeleteNode { node_id: 0 },
        },
    ];
    assert!(matches!(
        SyncRow::apply_in_order(&rows, &mut overlay),
        Err(oxgraph_postgres::PostgresGraphError::Sync(
            oxgraph_postgres::SyncError::NonMonotonicSequence { .. }
        ))
    ));
}

#[test]
fn sync_overlay_tombstone_hides_node() -> Result<(), oxgraph_postgres::PostgresGraphError> {
    let mut overlay = OverlayState::default();
    overlay.push_edge(OverlayEdge {
        source: 0,
        target: 1,
    });
    let rows = [SyncRow {
        sequence: 1,
        action: SyncAction::DeleteNode { node_id: 0 },
    }];
    let applied = SyncRow::apply_in_order(&rows, &mut overlay)?;
    assert_eq!(applied, 1);
    assert!(!overlay.node_visible(0));
    Ok(())
}

#[test]
fn dual_topology_dense_edges_loads_engine() -> Result<(), oxgraph_postgres::PostgresGraphError> {
    use oxgraph_postgres::DualTopologySnapshot;

    let bytes = DualTopologySnapshot::from_dense_u32_edges(&[(0, 1), (1, 2)], 0)?;
    let mut engine = EngineBuilder::new().snapshot_owned(bytes).build()?;
    assert_eq!(engine.status().node_count, 3);
    assert_eq!(engine.status().edge_count, 2);
    let visited = engine.visited_count(
        0,
        oxgraph_postgres::TraverseLimits::bounded(LIMIT_10),
        oxgraph_postgres::TraversalDirection::Out,
    )?;
    assert_eq!(visited, 3);
    Ok(())
}