lix 0.12.0

Embeddable version control for apps and AI agents.
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

use lix::{CreateBranchOptions, Value};
use serde_json::json;

simulation_test!(
    lix_active_branch_commit_id_returns_active_head,
    |sim| async move {
        let engine = sim.boot_engine().await;
        let session = sim.wrap_session(
            engine
                .open_session()
                .await
                .expect("main session should open"),
            &engine,
        );

        session
            .execute(
                "INSERT INTO lix_key_value (key, value) VALUES ('active-head', 'one')",
                &[],
            )
            .await
            .expect("tracked write should succeed");
        let expected = engine
            .load_branch_head_commit_id(sim.main_branch_id())
            .await
            .expect("head should load")
            .expect("head should exist");

        let result = session
            .execute("SELECT lix_active_branch_commit_id()", &[])
            .await
            .expect("active head UDF should execute");

        assert_eq!(
            result.rows()[0]
                .get::<String>("lix_active_branch_commit_id()")
                .unwrap(),
            expected
        );
    }
);

simulation_test!(
    lix_active_branch_id_is_session_scoped_in_reads_transactions_and_writes,
    |sim| async move {
        let engine = sim.boot_engine().await;
        let main = sim.wrap_session(
            engine
                .open_session_at(sim.main_branch_id())
                .await
                .expect("main session should open"),
            &engine,
        );
        main.create_branch(CreateBranchOptions {
            id: Some("01930000-0000-7000-8000-000000000016".to_string()),
            name: "UDF draft".to_string(),
            from_commit_id: None,
        })
        .await
        .expect("draft branch should be created");
        let draft = sim.wrap_session(
            engine
                .open_session_at("01930000-0000-7000-8000-000000000016")
                .await
                .expect("draft session should open"),
            &engine,
        );

        let main_result = main
            .execute("SELECT lix_active_branch_id() AS branch_id", &[])
            .await
            .expect("main branch UDF should execute");
        assert_eq!(
            main_result.rows()[0].get::<String>("branch_id").unwrap(),
            sim.main_branch_id()
        );
        let draft_result = draft
            .execute("SELECT lix_active_branch_id() AS branch_id", &[])
            .await
            .expect("draft branch UDF should execute");
        assert_eq!(
            draft_result.rows()[0].get::<String>("branch_id").unwrap(),
            "01930000-0000-7000-8000-000000000016"
        );

        let mut transaction = draft
            .begin_transaction()
            .await
            .expect("draft transaction should begin");
        let transaction_result = transaction
            .execute("SELECT lix_active_branch_id() AS branch_id", &[])
            .await
            .expect("transaction branch UDF should execute");
        assert_eq!(
            transaction_result.rows()[0]
                .get::<String>("branch_id")
                .unwrap(),
            "01930000-0000-7000-8000-000000000016"
        );
        transaction
            .execute(
                "INSERT INTO lix_key_value (key, value) \
                 VALUES ('61637469-7665-8d62-8261-6e63682d7500', lix_active_branch_id())",
                &[],
            )
            .await
            .expect("branch UDF should execute in a bound write");
        transaction
            .commit()
            .await
            .expect("draft transaction should commit");

        let stored = draft
            .execute(
                "SELECT value FROM lix_key_value WHERE key = '61637469-7665-8d62-8261-6e63682d7500'",
                &[],
            )
            .await
            .expect("stored branch should read");
        assert_eq!(
            stored.rows()[0].value("value").unwrap(),
            &Value::Jsonb(json!("01930000-0000-7000-8000-000000000016").into())
        );
    }
);

simulation_test!(
    lix_active_branch_commit_id_is_available_to_bound_writes,
    |sim| async move {
        let engine = sim.boot_engine().await;
        let session = sim.wrap_session(
            engine
                .open_session()
                .await
                .expect("main session should open"),
            &engine,
        );

        session
            .execute(
                "INSERT INTO lix_key_value (key, value) VALUES ('active-head-write-seed', 'one')",
                &[],
            )
            .await
            .expect("tracked write should establish an active head");
        let expected = engine
            .load_branch_head_commit_id(sim.main_branch_id())
            .await
            .expect("head should load")
            .expect("head should exist");

        session
            .execute(
                "INSERT INTO lix_key_value (key, value) \
                 VALUES ('active-head-write', lix_active_branch_commit_id())",
                &[],
            )
            .await
            .expect("bound write should evaluate active head UDF");

        let stored = session
            .execute(
                "SELECT value FROM lix_key_value WHERE key = 'active-head-write'",
                &[],
            )
            .await
            .expect("stored active head should read");
        assert_eq!(
            stored.rows()[0].value("value").unwrap(),
            &Value::Jsonb(json!(expected.clone()).into())
        );
    }
);