package tacitus import ( "github.com/shopspring/decimal" "strings" "time" ) var PRODUCTS = [...]string{"BTC-USD", "ETH-USD"} type Trade struct { Id int `json:"-"` TradeId int `json:"trade_id,"` Product string `json:"product,"` Price decimal.Decimal `json:"price,"` Size decimal.Decimal `json:"size,"` Buy bool `json:"buy,"` Sell bool `json:"sell,"` Timestamp time.Time `json:"timestamp,"` } type TradeService interface { Trade(id int) (Trade, error) TradeByTradeId(id int, prod string) (Trade, error) CreateTrade(t Trade) (Trade, error) DeleteTrade(id int) TradesInDateRange(product string, start, end time.Time) ([]Trade, error) FirstTrades(product string, limit int) ([]Trade, error) LastTrades(product string, limit int) ([]Trade, error) TradesAfter(product string, id, limit int) ([]Trade, error) TradesBefore(product string, id, limit int) ([]Trade, error) } func ValidProduct(prod string) bool { prod = strings.ToUpper(prod) for _, p := range PRODUCTS { if p == prod { return true } } return false }