126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
package postgres
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import (
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"time"
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"tacitus"
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)
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const (
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trade_columns = `trade_id, product, price, size, buy, sell, timestamp`
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trade_insert = `INSERT INTO trades (` + trade_columns + `) VALUES ` +
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`($1, $2, $3, $4, $5, $6, $7) RETURNING id;`
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trade_find = `SELECT id, ` + trade_columns + ` FROM trades WHERE id = $1;`
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trade_find_trade_id = `SELECT id, ` + trade_columns + ` FROM trades ` +
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`WHERE trade_id = $1 AND product = $2;`
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trade_delete = `DELETE FROM trades WHERE id = $1;`
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trades_in_date_range = `SELECT id, ` + trade_columns + ` FROM ` +
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`trades WHERE product = $1 AND timestamp >= $2 AND timestamp < $3;`
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trade_first = `SELECT id, ` + trade_columns + ` FROM trades WHERE ` +
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`product = $1 ORDER BY trade_id ASC LIMIT 1;`
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trade_last = `SELECT id, ` + trade_columns + ` FROM trades WHERE ` +
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`product = $1 ORDER BY trade_id DESC LIMIT 1;`
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)
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type TradeService struct {
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client *Client
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}
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func (t *TradeService) Trade(id int) (*tacitus.Trade, error) {
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var tr tacitus.Trade
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row := t.client.db.QueryRow(trade_find, id)
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if err := row.Scan(&tr.Id, &tr.TradeId, &tr.Product, &tr.Price, &tr.Size, &tr.Buy,
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&tr.Sell, &tr.Timestamp); err != nil {
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return nil, err
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}
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return &tr, nil
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}
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func (t *TradeService) TradeByTradeId(id int, prod string) (*tacitus.Trade, error) {
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var tr tacitus.Trade
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row := t.client.db.QueryRow(trade_find_trade_id, id, prod)
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if err := row.Scan(&tr.Id, &tr.TradeId, &tr.Product, &tr.Price,
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&tr.Size, &tr.Buy, &tr.Sell, &tr.Timestamp); err != nil {
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return nil, err
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}
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return &tr, nil
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}
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func (t *TradeService) CreateTrade(trade *tacitus.Trade) error {
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var id int
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res := t.client.db.QueryRow(trade_insert, trade.TradeId, trade.Product,
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trade.Price, trade.Size, trade.Buy, trade.Sell, trade.Timestamp)
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if err := res.Scan(&id); err != nil {
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return err
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}
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trade.Id = id
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return nil
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}
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func (t *TradeService) DeleteTrade(id int) {
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t.client.db.Exec(trade_delete, id)
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}
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func (t *TradeService) TradesInDateRange(product string, start,
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end time.Time) ([]tacitus.Trade, error) {
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trades := make([]tacitus.Trade, 0)
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rows, err := t.client.db.Query(trades_in_date_range, product, start, end)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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for rows.Next() {
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var trade tacitus.Trade
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if err = rows.Scan(&trade.Id, &trade.TradeId, &trade.Product, &trade.Price,
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&trade.Size, &trade.Buy, &trade.Sell, &trade.Timestamp); err != nil {
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return nil, err
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}
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trades = append(trades, trade)
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}
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if rows.Err() != nil {
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return nil, rows.Err()
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}
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return trades, nil
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}
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func (t *TradeService) FirstTrade(product string) (*tacitus.Trade, error) {
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var tr tacitus.Trade
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row := t.client.db.QueryRow(trade_first, product)
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if err := row.Scan(&tr.Id, &tr.TradeId, &tr.Product, &tr.Price, &tr.Size, &tr.Buy,
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&tr.Sell, &tr.Timestamp); err != nil {
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return nil, err
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}
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return &tr, nil
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}
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func (t *TradeService) LastTrade(product string) (*tacitus.Trade, error) {
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var tr tacitus.Trade
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row := t.client.db.QueryRow(trade_last, product)
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if err := row.Scan(&tr.Id, &tr.TradeId, &tr.Product, &tr.Price, &tr.Size, &tr.Buy,
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&tr.Sell, &tr.Timestamp); err != nil {
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return nil, err
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}
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return &tr, nil
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}
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