alert service

internal/repository/postgresql/alert.go

@@ -9,14 +9,14 @@ import (
 )
 
 const saveAlertQuery = `
-insert into alert(user_id, instrument_id, price)
-values ($1, $2, $3)
+insert into alert(user_id, instrument_id, price, condition)
+values ($1, $2, $3, $4)
 returning id`
 
 func (p *Postgresql) SaveAlert(ctx context.Context, alert *entities.Alert) (entities.AlertID, error) {
 	var id entities.AlertID
 
-	err := p.db.QueryRow(ctx, saveAlertQuery, alert.UserID, alert.Instrument.ID, alert.Price).Scan(&id)
+	err := p.db.QueryRow(ctx, saveAlertQuery, alert.UserID, alert.Instrument.ID, alert.Price.String(), alert.Condition).Scan(&id)
 	if err != nil {
 		return "", fmt.Errorf("failed to exec saveAlertQuery: %w", err)
 	}
@@ -24,8 +24,47 @@ func (p *Postgresql) SaveAlert(ctx context.Context, alert *entities.Alert) (enti
 	return id, nil
 }
 
+const allActiveAlertsQuery = `
+select a.id, a.user_id, a.price, a.condition, i.id, c_base.symbol, c_quote.symbol
+from alert a
+join instrument i on i.id = a.instrument_id
+join currency c_base on c_base.id = i.base_currency_id
+join currency c_quote on c_quote.id = i.quoted_currency_id
+where a.active = true
+order by a.id`
+
+func (p *Postgresql) AllActiveAlerts(ctx context.Context) ([]entities.Alert, error) {
+	rows, err := p.db.Query(ctx, allActiveAlertsQuery)
+	if err != nil {
+		return nil, fmt.Errorf("failed to exec allActiveAlertsQuery: %w", err)
+	}
+	defer rows.Close()
+
+	var alerts []entities.Alert
+	for rows.Next() {
+		var alert entities.Alert
+		var priceStr string
+
+		if err := rows.Scan(
+			&alert.ID, &alert.UserID, &priceStr, &alert.Condition,
+			&alert.Instrument.ID, &alert.Instrument.BaseCurrency, &alert.Instrument.QuoteCurrency,
+		); err != nil {
+			return nil, fmt.Errorf("failed to scan alert row: %w", err)
+		}
+
+		alert.Price, err = decimal.NewFromString(priceStr)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse alert price: %w", err)
+		}
+
+		alerts = append(alerts, alert)
+	}
+
+	return alerts, nil
+}
+
 const alertByIDQuery = `
-select a.id, a.user_id, a.price, i.id, c_base.symbol, c_quote.symbol
+select a.id, a.user_id, a.price, a.condition, i.id, c_base.symbol, c_quote.symbol
 from alert a
 join instrument i on i.id = a.instrument_id
 join currency c_base on c_base.id = i.base_currency_id
@@ -37,7 +76,7 @@ func (p *Postgresql) AlertByID(ctx context.Context, id entities.AlertID) (*entit
 	var priceStr string
 
 	err := p.db.QueryRow(ctx, alertByIDQuery, id).Scan(
-		&alert.ID, &alert.UserID, &priceStr,
+		&alert.ID, &alert.UserID, &priceStr, &alert.Condition,
 		&alert.Instrument.ID, &alert.Instrument.BaseCurrency, &alert.Instrument.QuoteCurrency,
 	)
 	if err != nil {
@@ -53,7 +92,7 @@ func (p *Postgresql) AlertByID(ctx context.Context, id entities.AlertID) (*entit
 }
 
 const alertsByUserIDQuery = `
-select a.id, a.user_id, a.price, i.id, c_base.symbol, c_quote.symbol
+select a.id, a.user_id, a.price, a.condition, i.id, c_base.symbol, c_quote.symbol
 from alert a
 join instrument i on i.id = a.instrument_id
 join currency c_base on c_base.id = i.base_currency_id
@@ -75,7 +114,7 @@ func (p *Postgresql) AlertsByUserID(ctx context.Context, userID entities.UserID,
 		var priceStr string
 
 		if err := rows.Scan(
-			&alert.ID, &alert.UserID, &priceStr,
+			&alert.ID, &alert.UserID, &priceStr, &alert.Condition,
 			&alert.Instrument.ID, &alert.Instrument.BaseCurrency, &alert.Instrument.QuoteCurrency,
 		); err != nil {
 			return nil, fmt.Errorf("failed to scan alert row: %w", err)
@@ -103,6 +142,17 @@ func (p *Postgresql) DeleteAlert(ctx context.Context, id entities.AlertID) error
 	return nil
 }
 
+const disableAlertQuery = "update alert set active = false where id = $1"
+
+func (p *Postgresql) DisableAlert(ctx context.Context, id entities.AlertID) error {
+	_, err := p.db.Exec(ctx, disableAlertQuery, id)
+	if err != nil {
+		return fmt.Errorf("failed to exec disableAlertQuery: %w", err)
+	}
+
+	return nil
+}
+
 const updateAlertPriceQuery = "update alert set price = $2 where id = $1"
 
 func (p *Postgresql) UpdateAlertPrice(ctx context.Context, id entities.AlertID, price decimal.Decimal) error {

internal/repository/postgresql/migrations/000001_init.down.sql

@@ -1,4 +1,5 @@
 drop table if exists alert;
+drop type alert_condition;
 drop table if exists instrument;
 drop table if exists currency;
 drop table if exists users;

internal/repository/postgresql/migrations/000001_init.up.sql

@@ -17,12 +17,15 @@ create table if not exists instrument (
   UNIQUE (base_currency_id, quoted_currency_id)
 );
 
+create type alert_condition as enum ('above', 'below');
+
 create table if not exists alert (
   id uuid primary key not null default gen_random_uuid(),
   user_id uuid references users(id) not null,
   instrument_id uuid references instrument(id) not null,
   price text not null,
-  active bool not null default true
+  active bool not null default true,
+  condition alert_condition not null
 );
 
 insert into currency(symbol) values ('USDT'), ('BTC'), ('ETH'), ('SOL');