bar

type Bar interface {
	// GetTime interval of this bar
	GetTime() time.Time

	// GetOpen price for the current bar
	GetOpen() float64

	// GetHigh price for the current bar
	GetHigh() float64

	// GetLow price for the current bar
	GetLow() float64

	// GetClose price for the current bar
	GetClose() float64

	// GetVolume of shares, options, coins, etc traded during this bar
	GetVolume() float64

	// GetOpenInterest (Optional) amount of derivatives currently outstanding for this bar
	// If there is no open interest then this will be -1, to indicate no data
	GetOpenInterest() int64

	// Clone makes a copy of the underlying bar
	Clone() (Bar, error)
}

type Loader interface {
	Read(ctx context.Context, input io.Reader) ([]Bar, error)
	Write(ctx context.Context, output io.Writer, input []Bar) error
}

type StandardBar struct {
	UnixTime     int64   `csv:"time" avro:"time" json:"time"`
	Open         float64 `csv:"open" avro:"open" json:"open"`
	High         float64 `csv:"high" avro:"high" json:"high"`
	Low          float64 `csv:"low" avro:"low" json:"low"`
	Close        float64 `csv:"close" avro:"close" json:"close"`
	Volume       float64 `csv:"volume" avro:"volume" json:"volume"`
	OpenInterest int64   `csv:"open_interest" avro:"open_interest" json:"open_interest"`
}