nodedb 0.3.0

Local-first, real-time, edge-to-cloud hybrid database for multi-modal workloads
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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220

// SPDX-License-Identifier: BUSL-1.1

//! End-to-end pgwire tests for `SHOW GRAPH STATS`.
//!
//! Covers the compact and VERBOSE response forms, error handling for
//! unknown collections, and the persistence-rooted invariant motivated
//! by issue #107 (counts come from the durable edge store, not from
//! the in-memory CSR cache).

mod common;

use common::pgwire_harness::TestServer;

/// Find the row matching `collection` in a compact `SHOW GRAPH STATS` rowset.
/// Returns `(node_count, edge_count, distinct_label_count, labels_json)`.
fn find_row<'a>(rows: &'a [Vec<String>], collection: &str) -> Option<(i64, i64, i64, &'a str)> {
    rows.iter().find(|r| r[0] == collection).map(|r| {
        (
            r[1].parse::<i64>().expect("node_count is integer"),
            r[2].parse::<i64>().expect("edge_count is integer"),
            r[3].parse::<i64>()
                .expect("distinct_label_count is integer"),
            r[4].as_str(),
        )
    })
}

#[tokio::test]
async fn empty_collection_returns_zeros() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_empty").await.unwrap();

    let rows = srv.query_rows("SHOW GRAPH STATS 'g_empty'").await.unwrap();
    // With no edges, the broadcast aggregates to an empty result set.
    // That is the correct "zero state" — no row is emitted because the
    // counter table has no summary row for the collection yet.
    assert!(
        rows.is_empty() || {
            let (nc, ec, lc, _) = find_row(&rows, "g_empty").expect("row for g_empty");
            nc == 0 && ec == 0 && lc == 0
        },
        "expected empty or zero-counter row, got {rows:?}"
    );
}

#[tokio::test]
async fn single_edge_collection_counts() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_single").await.unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_single' FROM 'a' TO 'b' TYPE 'knows'")
        .await
        .unwrap();

    let rows = srv.query_rows("SHOW GRAPH STATS 'g_single'").await.unwrap();
    let (nc, ec, lc, labels) = find_row(&rows, "g_single").expect("row for g_single");
    assert_eq!(nc, 2, "node_count");
    assert_eq!(ec, 1, "edge_count");
    assert_eq!(lc, 1, "distinct_label_count");
    assert!(
        labels.contains("knows"),
        "labels JSON must include 'knows': {labels}"
    );
}

#[tokio::test]
async fn multi_label_distinct_count() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_multi").await.unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_multi' FROM 'a' TO 'b' TYPE 'knows'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_multi' FROM 'a' TO 'c' TYPE 'follows'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_multi' FROM 'b' TO 'c' TYPE 'reports_to'")
        .await
        .unwrap();

    let rows = srv.query_rows("SHOW GRAPH STATS 'g_multi'").await.unwrap();
    let (nc, ec, lc, labels) = find_row(&rows, "g_multi").expect("row for g_multi");
    assert_eq!(nc, 3, "3 distinct nodes (a, b, c)");
    assert_eq!(ec, 3, "3 edges");
    assert_eq!(lc, 3, "3 distinct labels");
    for label in ["knows", "follows", "reports_to"] {
        assert!(
            labels.contains(label),
            "labels JSON missing '{label}': {labels}"
        );
    }
}

#[tokio::test]
async fn self_loop_counts_one_node() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_loop").await.unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_loop' FROM 'x' TO 'x' TYPE 'self_ref'")
        .await
        .unwrap();

    let rows = srv.query_rows("SHOW GRAPH STATS 'g_loop'").await.unwrap();
    let (nc, ec, lc, _) = find_row(&rows, "g_loop").expect("row for g_loop");
    assert_eq!(nc, 1, "self-loop counts as one distinct node");
    assert_eq!(ec, 1);
    assert_eq!(lc, 1);
}

#[tokio::test]
async fn non_existent_collection_errors() {
    let srv = TestServer::start().await;
    let err = srv
        .query_rows("SHOW GRAPH STATS 'never_created'")
        .await
        .expect_err("missing collection must error");
    let msg = err.to_string();
    assert!(
        msg.contains("not found") || msg.contains("never_created"),
        "expected collection-not-found error, got: {msg}"
    );
}

#[tokio::test]
async fn verbose_returns_one_row_per_label() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_verbose").await.unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_verbose' FROM 'a' TO 'b' TYPE 'k'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_verbose' FROM 'a' TO 'c' TYPE 'k'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_verbose' FROM 'a' TO 'd' TYPE 'f'")
        .await
        .unwrap();

    let rows = srv
        .query_rows("SHOW GRAPH STATS 'g_verbose' VERBOSE")
        .await
        .unwrap();
    // Verbose schema: (collection, label, edge_count) — one row per
    // (collection, label) pair.
    let by_label: std::collections::BTreeMap<String, i64> = rows
        .iter()
        .filter(|r| r[0] == "g_verbose")
        .map(|r| (r[1].clone(), r[2].parse::<i64>().expect("count is integer")))
        .collect();
    assert_eq!(by_label.get("k").copied(), Some(2));
    assert_eq!(by_label.get("f").copied(), Some(1));
}

#[tokio::test]
async fn tenant_aggregate_with_no_arg() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_agg_a").await.unwrap();
    srv.exec("CREATE COLLECTION g_agg_b").await.unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_agg_a' FROM 'a' TO 'b' TYPE 'k'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_agg_b' FROM 'x' TO 'y' TYPE 'f'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_agg_b' FROM 'y' TO 'z' TYPE 'f'")
        .await
        .unwrap();

    let rows = srv.query_rows("SHOW GRAPH STATS").await.unwrap();
    let (_, ec_a, _, _) = find_row(&rows, "g_agg_a").expect("g_agg_a present");
    let (_, ec_b, _, _) = find_row(&rows, "g_agg_b").expect("g_agg_b present");
    assert_eq!(ec_a, 1);
    assert_eq!(ec_b, 2);
}

#[tokio::test]
async fn repeated_edges_in_multigraph() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_multi_edge").await.unwrap();
    // Two edges between the same pair with different labels — both count.
    srv.exec("GRAPH INSERT EDGE IN 'g_multi_edge' FROM 'a' TO 'b' TYPE 'l1'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_multi_edge' FROM 'a' TO 'b' TYPE 'l2'")
        .await
        .unwrap();

    let rows = srv
        .query_rows("SHOW GRAPH STATS 'g_multi_edge'")
        .await
        .unwrap();
    let (nc, ec, lc, _) = find_row(&rows, "g_multi_edge").expect("row");
    assert_eq!(nc, 2, "still 2 distinct nodes");
    assert_eq!(ec, 2, "2 edges, distinct by label");
    assert_eq!(lc, 2);
}

#[tokio::test]
async fn deleted_edge_drops_from_live_count() {
    let srv = TestServer::start().await;
    srv.exec("CREATE COLLECTION g_del").await.unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_del' FROM 'a' TO 'b' TYPE 'k'")
        .await
        .unwrap();
    srv.exec("GRAPH INSERT EDGE IN 'g_del' FROM 'a' TO 'c' TYPE 'k'")
        .await
        .unwrap();

    // Sanity: both edges present.
    {
        let rows = srv.query_rows("SHOW GRAPH STATS 'g_del'").await.unwrap();
        let (_, ec, _, _) = find_row(&rows, "g_del").expect("pre-delete row");
        assert_eq!(ec, 2);
    }

    srv.exec("GRAPH DELETE EDGE IN 'g_del' FROM 'a' TO 'b' TYPE 'k'")
        .await
        .unwrap();

    let rows = srv.query_rows("SHOW GRAPH STATS 'g_del'").await.unwrap();
    let (_, ec, lc, _) = find_row(&rows, "g_del").expect("post-delete row");
    assert_eq!(ec, 1, "edge count decremented after delete");
    assert_eq!(lc, 1, "label count unchanged (label still in use)");
}