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

use sqlx::{Acquire, PgPool, Postgres, Transaction};
use tracing::instrument;

use std::collections::HashMap;

use crate::{
    account::Accounts, balance::*, entry::*, error::*, event::*, journal::*, primitives::*,
    transaction::*, tx_template::*,
};

#[derive(Debug, Clone)]
pub struct SqlxLedger {
    pool: PgPool,
    accounts: Accounts,
    journals: Journals,
    tx_templates: TxTemplates,
    transactions: Transactions,
    entries: Entries,
    balances: Balances,
}

impl SqlxLedger {
    pub fn new(pool: &PgPool) -> Self {
        Self {
            accounts: Accounts::new(pool),
            journals: Journals::new(pool),
            tx_templates: TxTemplates::new(pool),
            transactions: Transactions::new(pool),
            entries: Entries::new(pool),
            balances: Balances::new(pool),
            pool: pool.clone(),
        }
    }

    pub fn accounts(&self) -> &Accounts {
        &self.accounts
    }

    pub fn journals(&self) -> &Journals {
        &self.journals
    }

    pub fn tx_templates(&self) -> &TxTemplates {
        &self.tx_templates
    }

    pub fn entries(&self) -> &Entries {
        &self.entries
    }

    pub fn balances(&self) -> &Balances {
        &self.balances
    }

    pub fn transactions(&self) -> &Transactions {
        &self.transactions
    }

    pub async fn post_transaction(
        &self,
        tx_id: TransactionId,
        tx_template_code: &str,
        params: Option<impl Into<TxParams> + std::fmt::Debug>,
    ) -> Result<(), SqlxLedgerError> {
        let tx = self.pool.begin().await?;
        self.post_transaction_in_tx(tx, tx_id, tx_template_code, params)
            .await?;
        Ok(())
    }

    #[instrument(name = "sqlx_ledger.ledger.post_transaction", skip(self, tx))]
    pub async fn post_transaction_in_tx(
        &self,
        mut tx: Transaction<'_, Postgres>,
        tx_id: TransactionId,
        tx_template_code: &str,
        params: Option<impl Into<TxParams> + std::fmt::Debug>,
    ) -> Result<(), SqlxLedgerError> {
        let tx_template = self.tx_templates.find_core(tx_template_code).await?;
        let (new_tx, new_entries) =
            tx_template.prep_tx(params.map(|p| p.into()).unwrap_or_else(TxParams::new))?;
        let (journal_id, tx_id) = self
            .transactions
            .create_in_tx(&mut tx, tx_id, new_tx)
            .await?;
        let entries = self
            .entries
            .create_all(journal_id, tx_id, new_entries, &mut tx)
            .await?;
        {
            let ids: Vec<(AccountId, &Currency)> = entries
                .iter()
                .map(|entry| (entry.account_id, &entry.currency))
                .collect();
            let mut balance_tx = tx.begin().await?;

            let mut balances = self
                .balances
                .find_for_update(journal_id, ids.clone(), &mut balance_tx)
                .await?;
            let mut latest_balances: HashMap<AccountId, BalanceDetails> = HashMap::new();
            let mut new_balances = Vec::new();
            for entry in entries.iter() {
                let balance = match (
                    latest_balances.remove(&entry.account_id),
                    balances.remove(&entry.account_id),
                ) {
                    (Some(latest), _) => {
                        new_balances.push(latest.clone());
                        latest
                    }
                    (_, Some(balance)) => balance,
                    _ => {
                        latest_balances
                            .insert(entry.account_id, BalanceDetails::init(journal_id, entry));
                        continue;
                    }
                };
                latest_balances.insert(entry.account_id, balance.update(entry));
            }
            new_balances.extend(latest_balances.into_values());

            self.balances
                .update_balances(journal_id, new_balances, &mut balance_tx)
                .await?;
            balance_tx.commit().await?;
        }
        tx.commit().await?;
        Ok(())
    }

    pub async fn events(
        &self,
        opts: EventSubscriberOpts,
    ) -> Result<EventSubscriber, SqlxLedgerError> {
        EventSubscriber::connect(&self.pool, opts).await
    }
}