use sqlx::{PgPool, Postgres, QueryBuilder, Row, Transaction};
use tracing::instrument;
use uuid::Uuid;
use std::collections::HashMap;
use super::entity::*;
use crate::{error::*, primitives::*};
#[derive(Debug, Clone)]
pub struct Balances {
pool: PgPool,
}
impl Balances {
pub fn new(pool: &PgPool) -> Self {
Self { pool: pool.clone() }
}
#[instrument(name = "sqlx_ledger.balances.find", skip(self))]
pub async fn find(
&self,
journal_id: JournalId,
account_id: AccountId,
currency: Currency,
) -> Result<Option<AccountBalance>, SqlxLedgerError> {
let record = sqlx::query!(
r#"SELECT
a.normal_balance_type as "normal_balance_type: DebitOrCredit", b.journal_id, b.account_id, entry_id, b.currency,
settled_dr_balance, settled_cr_balance, settled_entry_id, settled_modified_at,
pending_dr_balance, pending_cr_balance, pending_entry_id, pending_modified_at,
encumbered_dr_balance, encumbered_cr_balance, encumbered_entry_id, encumbered_modified_at,
c.version, modified_at, created_at
FROM sqlx_ledger_balances b JOIN (
SELECT * FROM sqlx_ledger_current_balances WHERE journal_id = $1 AND account_id = $2 AND currency = $3 ) c
ON b.journal_id = c.journal_id AND b.account_id = c.account_id AND b.currency = c.currency AND b.version = c.version
JOIN ( SELECT id, normal_balance_type FROM sqlx_ledger_accounts WHERE id = $2 LIMIT 1 ) a
ON a.id = b.account_id"#,
Uuid::from(journal_id),
Uuid::from(account_id),
currency.code()
)
.fetch_optional(&self.pool)
.await?;
Ok(record.map(|record| AccountBalance {
balance_type: record.normal_balance_type,
details: BalanceDetails {
journal_id,
account_id,
entry_id: EntryId::from(record.entry_id),
currency,
settled_dr_balance: record.settled_dr_balance,
settled_cr_balance: record.settled_cr_balance,
settled_entry_id: EntryId::from(record.settled_entry_id),
settled_modified_at: record.settled_modified_at,
pending_dr_balance: record.pending_dr_balance,
pending_cr_balance: record.pending_cr_balance,
pending_entry_id: EntryId::from(record.pending_entry_id),
pending_modified_at: record.pending_modified_at,
encumbered_dr_balance: record.encumbered_dr_balance,
encumbered_cr_balance: record.encumbered_cr_balance,
encumbered_entry_id: EntryId::from(record.encumbered_entry_id),
encumbered_modified_at: record.encumbered_modified_at,
version: record.version,
modified_at: record.modified_at,
created_at: record.created_at,
},
}))
}
pub(crate) async fn find_for_update<'a>(
&self,
journal_id: JournalId,
ids: Vec<(AccountId, &Currency)>,
tx: &mut Transaction<'a, Postgres>,
) -> Result<HashMap<AccountId, BalanceDetails>, SqlxLedgerError> {
let mut query_builder: QueryBuilder<Postgres> = QueryBuilder::new(
r#"SELECT
b.journal_id, b.account_id, entry_id, b.currency,
settled_dr_balance, settled_cr_balance, settled_entry_id, settled_modified_at,
pending_dr_balance, pending_cr_balance, pending_entry_id, pending_modified_at,
encumbered_dr_balance, encumbered_cr_balance, encumbered_entry_id, encumbered_modified_at,
c.version, modified_at, created_at
FROM sqlx_ledger_balances b JOIN (
SELECT * FROM sqlx_ledger_current_balances WHERE journal_id = "#,
);
query_builder.push_bind(Uuid::from(journal_id));
query_builder.push(r#" AND (account_id, currency) IN"#);
query_builder.push_tuples(ids, |mut builder, (id, currency)| {
builder.push_bind(Uuid::from(id));
builder.push_bind(currency.code());
});
query_builder.push(
r#"FOR UPDATE ) c ON
b.journal_id = c.journal_id AND b.account_id = c.account_id AND b.currency = c.currency AND b.version = c.version"#,
);
let query = query_builder.build();
let records = query.fetch_all(&mut *tx).await?;
let mut ret = HashMap::new();
for r in records {
let account_id = AccountId::from(r.get::<Uuid, _>("account_id"));
ret.insert(
account_id,
BalanceDetails {
account_id,
journal_id: JournalId::from(r.get::<Uuid, _>("journal_id")),
entry_id: EntryId::from(r.get::<Uuid, _>("entry_id")),
currency: r.get::<&str, _>("currency").parse()?,
settled_dr_balance: r.get("settled_dr_balance"),
settled_cr_balance: r.get("settled_cr_balance"),
settled_entry_id: EntryId::from(r.get::<Uuid, _>("settled_entry_id")),
settled_modified_at: r.get("settled_modified_at"),
pending_dr_balance: r.get("pending_dr_balance"),
pending_cr_balance: r.get("pending_cr_balance"),
pending_entry_id: EntryId::from(r.get::<Uuid, _>("pending_entry_id")),
pending_modified_at: r.get("pending_modified_at"),
encumbered_dr_balance: r.get("encumbered_dr_balance"),
encumbered_cr_balance: r.get("encumbered_cr_balance"),
encumbered_entry_id: EntryId::from(r.get::<Uuid, _>("encumbered_entry_id")),
encumbered_modified_at: r.get("encumbered_modified_at"),
version: r.get("version"),
modified_at: r.get("modified_at"),
created_at: r.get("created_at"),
},
);
}
Ok(ret)
}
pub(crate) async fn update_balances<'a>(
&self,
journal_id: JournalId,
new_balances: Vec<BalanceDetails>,
tx: &mut Transaction<'a, Postgres>,
) -> Result<(), SqlxLedgerError> {
let mut latest_versions = HashMap::new();
let mut previous_versions = HashMap::new();
for BalanceDetails {
account_id,
version,
currency,
..
} in new_balances.iter()
{
latest_versions.insert((account_id, currency), version);
if previous_versions.contains_key(&(account_id, currency)) {
continue;
}
previous_versions.insert((account_id, currency), version - 1);
}
let expected_accounts_effected = latest_versions.len();
let mut query_builder: QueryBuilder<Postgres> = QueryBuilder::new(
r#"INSERT INTO sqlx_ledger_current_balances
(journal_id, account_id, currency, version)"#,
);
let mut any_new = false;
query_builder.push_values(
previous_versions.iter().filter(|(_, v)| **v == 0),
|mut builder, ((account_id, currency), version)| {
any_new = true;
builder.push_bind(Uuid::from(journal_id));
builder.push_bind(Uuid::from(**account_id));
builder.push_bind(currency.code());
builder.push_bind(version);
},
);
if any_new {
query_builder.build().execute(&mut *tx).await?;
}
let mut query_builder: QueryBuilder<Postgres> =
QueryBuilder::new(r#"UPDATE sqlx_ledger_current_balances SET version = CASE"#);
let mut bind_numbers = HashMap::new();
let mut next_bind_number = 1;
for ((account_id, currency), version) in latest_versions {
bind_numbers.insert((account_id, currency), next_bind_number);
next_bind_number += 3;
query_builder.push(" WHEN account_id = ");
query_builder.push_bind(Uuid::from(*account_id));
query_builder.push(" AND currency = ");
query_builder.push_bind(currency.code());
query_builder.push(" THEN ");
query_builder.push_bind(version);
}
query_builder.push(" END WHERE journal_id = ");
query_builder.push_bind(Uuid::from(journal_id));
query_builder.push(" AND (account_id, currency, version) IN");
query_builder.push_tuples(
previous_versions,
|mut builder, ((account_id, currency), version)| {
let n = bind_numbers.remove(&(account_id, currency)).unwrap();
builder.push(format!("${}, ${}", n, n + 1));
builder.push_bind(version);
},
);
let result = query_builder.build().execute(&mut *tx).await?;
if result.rows_affected() != (expected_accounts_effected as u64) {
return Err(SqlxLedgerError::OptimisticLockingError);
}
let mut query_builder: QueryBuilder<Postgres> = QueryBuilder::new(
r#"INSERT INTO sqlx_ledger_balances (
journal_id, account_id, entry_id, currency,
settled_dr_balance, settled_cr_balance, settled_entry_id, settled_modified_at,
pending_dr_balance, pending_cr_balance, pending_entry_id, pending_modified_at,
encumbered_dr_balance, encumbered_cr_balance, encumbered_entry_id, encumbered_modified_at,
version, modified_at, created_at)
"#,
);
query_builder.push_values(new_balances, |mut builder, b| {
builder.push_bind(Uuid::from(b.journal_id));
builder.push_bind(Uuid::from(b.account_id));
builder.push_bind(Uuid::from(b.entry_id));
builder.push_bind(b.currency.code());
builder.push_bind(b.settled_dr_balance);
builder.push_bind(b.settled_cr_balance);
builder.push_bind(Uuid::from(b.settled_entry_id));
builder.push_bind(b.settled_modified_at);
builder.push_bind(b.pending_dr_balance);
builder.push_bind(b.pending_cr_balance);
builder.push_bind(Uuid::from(b.pending_entry_id));
builder.push_bind(b.pending_modified_at);
builder.push_bind(b.encumbered_dr_balance);
builder.push_bind(b.encumbered_cr_balance);
builder.push_bind(Uuid::from(b.encumbered_entry_id));
builder.push_bind(b.encumbered_modified_at);
builder.push_bind(b.version);
builder.push_bind(b.modified_at);
builder.push_bind(b.created_at);
});
query_builder.build().execute(&mut *tx).await?;
Ok(())
}
}