sentio/market.go

package sentio

import (
	"context"
	"errors"
)

var (
	ErrMarketClosed  = errors.New("market is closed")
	ErrTooSmallOrder = errors.New("too small order size")
)

type Market interface {
	Connect(done chan struct{}) (chan MarketConnection, error)
	Subscribe(symbol string) error

	IsMarketOpened() bool
	Time() Clock

	LatestBar(symbol string) (*Bar, error)

	Buy(ctx context.Context, symbol string, ratio float64) (Order, error)
	Sell(ctx context.Context, symbol string, ratio float64) (Order, error)
	CancelOrder(id string) error

	Orders() ([]Order, error)
	Portfolio() (Portfolio, error)

	Cash() (float64, error)
	Equity() (float64, error)
	MaxBudget() float64
}