alert usecases & repository methods

internal/entities/alert.go

@@ -0,0 +1,12 @@
+package entities
+
+import "github.com/shopspring/decimal"
+
+type AlertID string
+
+type Alert struct {
+	ID         AlertID
+	UserID     UserID
+	Price      decimal.Decimal
+	Instrument Instrument
+}

internal/repository/postgresql/alert.go

@@ -1 +1,115 @@
 package postgresql
+
+import (
+	"context"
+	"fmt"
+
+	"gitea.computernetthings.ru/yash/crypto_alert_bot/internal/entities"
+	"github.com/shopspring/decimal"
+)
+
+const saveAlertQuery = `
+insert into alert(user_id, instrument_id, price)
+values ($1, $2, $3)
+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)
+	if err != nil {
+		return "", fmt.Errorf("failed to exec saveAlertQuery: %w", err)
+	}
+
+	return id, nil
+}
+
+const alertByIDQuery = `
+select a.id, a.user_id, a.price, 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.id = $1 and a.active = true`
+
+func (p *Postgresql) AlertByID(ctx context.Context, id entities.AlertID) (*entities.Alert, error) {
+	var alert entities.Alert
+	var priceStr string
+
+	err := p.db.QueryRow(ctx, alertByIDQuery, id).Scan(
+		&alert.ID, &alert.UserID, &priceStr,
+		&alert.Instrument.ID, &alert.Instrument.BaseCurrency, &alert.Instrument.QuoteCurrency,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("failed to exec alertByIDQuery: %w", err)
+	}
+
+	alert.Price, err = decimal.NewFromString(priceStr)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse alert price: %w", err)
+	}
+
+	return &alert, nil
+}
+
+const alertsByUserIDQuery = `
+select a.id, a.user_id, a.price, 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.user_id = $1 and a.active = true
+order by a.id
+offset $2 limit $3`
+
+func (p *Postgresql) AlertsByUserID(ctx context.Context, userID entities.UserID, offset, limit int) ([]entities.Alert, error) {
+	rows, err := p.db.Query(ctx, alertsByUserIDQuery, userID, offset, limit)
+	if err != nil {
+		return nil, fmt.Errorf("failed to exec alertsByUserIDQuery: %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.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 deleteAlertQuery = "update alert set active = false where id = $1"
+
+func (p *Postgresql) DeleteAlert(ctx context.Context, id entities.AlertID) error {
+	_, err := p.db.Exec(ctx, deleteAlertQuery, id)
+	if err != nil {
+		return fmt.Errorf("failed to exec deleteAlertQuery: %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 {
+	_, err := p.db.Exec(ctx, updateAlertPriceQuery, id, price.String())
+	if err != nil {
+		return fmt.Errorf("failed to exec updateAlertPriceQuery: %w", err)
+	}
+
+	return nil
+}

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

@@ -19,6 +19,7 @@ create table if not exists instrument (
 
 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

internal/repository/repository.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"gitea.computernetthings.ru/yash/crypto_alert_bot/internal/entities"
+	"github.com/shopspring/decimal"
 )
 
 type Storage interface {
@@ -13,4 +14,10 @@ type Storage interface {
 
 	InstrumentList(ctx context.Context, offset, limit int) ([]entities.Instrument, error)
 	CreateInstrument(ctx context.Context, instrument *entities.Instrument) (entities.InstrumentID, error)
+
+	SaveAlert(ctx context.Context, alert *entities.Alert) (entities.AlertID, error)
+	AlertByID(ctx context.Context, id entities.AlertID) (*entities.Alert, error)
+	AlertsByUserID(ctx context.Context, userID entities.UserID, offset, limit int) ([]entities.Alert, error)
+	DeleteAlert(ctx context.Context, id entities.AlertID) error
+	UpdateAlertPrice(ctx context.Context, id entities.AlertID, price decimal.Decimal) error
 }

internal/usecase/alert.go

@@ -0,0 +1,57 @@
+package usecase
+
+import (
+	"context"
+	"fmt"
+
+	"gitea.computernetthings.ru/yash/crypto_alert_bot/internal/entities"
+	"github.com/shopspring/decimal"
+)
+
+func (uc *Usecase) CreateAlert(ctx context.Context, alert *entities.Alert) (entities.AlertID, error) {
+	id, err := uc.storage.SaveAlert(ctx, alert)
+	if err != nil {
+		uc.log.Error("failed to create alert", "alert", alert, "err", err)
+		return "", fmt.Errorf("failed to create alert: %w", err)
+	}
+
+	return id, nil
+}
+
+func (uc *Usecase) Alert(ctx context.Context, alertID entities.AlertID) (*entities.Alert, error) {
+	alert, err := uc.storage.AlertByID(ctx, alertID)
+	if err != nil {
+		uc.log.Error("failed to get alert", "alert_id", alertID, "err", err)
+		return nil, fmt.Errorf("failed to get alert: %w", err)
+	}
+
+	return alert, nil
+}
+
+func (uc *Usecase) Alerts(ctx context.Context, userID entities.UserID, offset, limit int) ([]entities.Alert, error) {
+	alerts, err := uc.storage.AlertsByUserID(ctx, userID, offset, limit)
+	if err != nil {
+		uc.log.Error("failed to get alerts", "user_id", userID, "err", err)
+		return nil, fmt.Errorf("failed to get alerts: %w", err)
+	}
+
+	return alerts, nil
+}
+
+func (uc *Usecase) RemoveAlert(ctx context.Context, alertID entities.AlertID) error {
+	if err := uc.storage.DeleteAlert(ctx, alertID); err != nil {
+		uc.log.Error("failed to remove alert", "alert_id", alertID, "err", err)
+		return fmt.Errorf("failed to remove alert: %w", err)
+	}
+
+	return nil
+}
+
+func (uc *Usecase) UpdateAlertPrice(ctx context.Context, alertID entities.AlertID, price decimal.Decimal) error {
+	if err := uc.storage.UpdateAlertPrice(ctx, alertID, price); err != nil {
+		uc.log.Error("failed to update alert price", "alert_id", alertID, "price", price, "err", err)
+		return fmt.Errorf("failed to update alert price: %w", err)
+	}
+
+	return nil
+}