pgevolve-core 0.3.8

Postgres declarative schema management — core library (parser, IR, diff, planner) powering the pgevolve CLI.
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

//! Translate [`ClusterChange`] → [`RawStep`].
//!
//! Sibling of `plan/rewrite/emit/` for per-DB ops. Each cluster op is
//! self-contained (not scoped to a `QualifiedName`), so `targets` is left
//! empty — downstream consumers that iterate `targets` for status display
//! or dep-graph wiring can skip cluster steps, which is consistent with the
//! current design where cluster and per-DB plans are kept separate.

use crate::diff::cluster::{ClusterChange, ClusterChangeEntry, ClusterChangeSet};
use crate::plan::raw_step::{RawStep, StepKind, TransactionConstraint};

use super::sql;

/// Emit one [`RawStep`] per [`ClusterChange`]. All cluster ops run
/// [`InTransaction`](TransactionConstraint::InTransaction).
#[must_use]
pub fn emit_cluster_changes(cs: &ClusterChangeSet) -> Vec<RawStep> {
    cs.entries.iter().map(emit_one).collect()
}

fn emit_one(entry: &ClusterChangeEntry) -> RawStep {
    match &entry.change {
        ClusterChange::CreateRole(role) => RawStep {
            step_no: 0,
            kind: StepKind::CreateRole,
            destructive: false,
            destructive_reason: None,
            intent_id: None,
            // Cluster ops are not scoped to a QualifiedName; targets is empty.
            targets: vec![],
            sql: sql::create_role(role),
            transactional: TransactionConstraint::InTransaction,
        },
        ClusterChange::DropRole { name } => RawStep {
            step_no: 0,
            kind: StepKind::DropRole,
            destructive: true,
            destructive_reason: entry.destructiveness.reason().map(str::to_owned),
            intent_id: None,
            targets: vec![],
            sql: sql::drop_role(name),
            transactional: TransactionConstraint::InTransaction,
        },
        ClusterChange::AlterRoleAttributes { name, from, to } => RawStep {
            step_no: 0,
            kind: StepKind::AlterRole,
            destructive: false,
            destructive_reason: None,
            intent_id: None,
            targets: vec![],
            sql: sql::alter_role_attributes(name, from, to),
            transactional: TransactionConstraint::InTransaction,
        },
        ClusterChange::GrantRoleMembership { member, role } => RawStep {
            step_no: 0,
            kind: StepKind::GrantRoleMembership,
            destructive: false,
            destructive_reason: None,
            intent_id: None,
            targets: vec![],
            sql: sql::grant_role_membership(role, member),
            transactional: TransactionConstraint::InTransaction,
        },
        ClusterChange::RevokeRoleMembership { member, role } => RawStep {
            step_no: 0,
            kind: StepKind::RevokeRoleMembership,
            destructive: false,
            destructive_reason: None,
            intent_id: None,
            targets: vec![],
            sql: sql::revoke_role_membership(role, member),
            transactional: TransactionConstraint::InTransaction,
        },
        ClusterChange::CommentOnRole { name, comment } => RawStep {
            step_no: 0,
            kind: StepKind::CommentOnRole,
            destructive: false,
            destructive_reason: None,
            intent_id: None,
            targets: vec![],
            sql: sql::comment_on_role(name, comment.as_deref()),
            transactional: TransactionConstraint::InTransaction,
        },
    }
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------

#[cfg(test)]
mod tests {
    use super::*;
    use crate::diff::cluster::{ClusterChange, ClusterChangeEntry};
    use crate::diff::destructiveness::Destructiveness;
    use crate::identifier::Identifier;
    use crate::ir::cluster::role::{Role, RoleAttributes};

    fn id(s: &str) -> Identifier {
        Identifier::from_unquoted(s).unwrap()
    }

    #[test]
    fn create_role_emits_create_kind() {
        let entry = ClusterChangeEntry {
            change: ClusterChange::CreateRole(Role {
                name: id("app_user"),
                attributes: RoleAttributes::default(),
                member_of: vec![],
                comment: None,
            }),
            destructiveness: Destructiveness::Safe,
        };
        let step = emit_one(&entry);
        assert!(matches!(step.kind, StepKind::CreateRole));
        assert!(step.sql.starts_with("CREATE ROLE"), "got: {}", step.sql);
        assert!(!step.destructive);
        assert!(matches!(
            step.transactional,
            TransactionConstraint::InTransaction
        ));
    }

    #[test]
    fn drop_role_emits_destructive() {
        let entry = ClusterChangeEntry {
            change: ClusterChange::DropRole { name: id("old") },
            destructiveness: Destructiveness::RequiresApprovalAndDataLossWarning {
                reason: "drops".into(),
            },
        };
        let step = emit_one(&entry);
        assert!(matches!(step.kind, StepKind::DropRole));
        assert!(step.destructive);
        assert_eq!(step.destructive_reason.as_deref(), Some("drops"));
    }
}