mithril_aggregator/database/query/certificate/
get_master_certificate.rs

1use sqlite::Value;
2
3use mithril_common::entities::Epoch;
4use mithril_persistence::sqlite::{Query, SourceAlias, SqLiteEntity, WhereCondition};
5
6use crate::database::record::CertificateRecord;
7
8/// Query to obtains the master [CertificateRecord] of an epoch
9pub struct MasterCertificateQuery {
10    condition: WhereCondition,
11}
12
13impl MasterCertificateQuery {
14    pub fn for_epoch(epoch: Epoch) -> Self {
15        let epoch_i64: i64 = epoch.try_into().unwrap();
16        let condition = WhereCondition::new(
17            "certificate.epoch between ?* and ?*",
18            vec![Value::Integer(epoch_i64 - 1), Value::Integer(epoch_i64)],
19        )
20        .and_where(
21            WhereCondition::new("certificate.parent_certificate_id is null", vec![]).or_where(
22                WhereCondition::new("certificate.epoch != parent_certificate.epoch", vec![]),
23            ),
24        );
25
26        Self { condition }
27    }
28}
29
30impl Query for MasterCertificateQuery {
31    type Entity = CertificateRecord;
32
33    fn filters(&self) -> WhereCondition {
34        self.condition.clone()
35    }
36
37    fn get_definition(&self, condition: &str) -> String {
38        // it is important to alias the fields with the same name as the table
39        // since the table cannot be aliased in a RETURNING statement in SQLite.
40        let projection = Self::Entity::get_projection().expand(SourceAlias::new(&[
41            ("{:certificate:}", "certificate"),
42            ("{:parent_certificate:}", "parent_certificate"),
43        ]));
44
45        format!(
46            r#"
47select {projection}
48from certificate
49    left join certificate as parent_certificate
50        on parent_certificate.certificate_id = certificate.parent_certificate_id
51where {condition}
52order by certificate.ROWID desc"#
53        )
54    }
55}