inklabs/rangedb

package rangedberror
 
import (
    "fmt"
    "strings"
)
 
// UnexpectedSequenceNumber is an error containing expected and actual sequence numbers.
type UnexpectedSequenceNumber struct {
    Expected             uint64
    ActualSequenceNumber uint64
}
 
// NewUnexpectedSequenceNumberFromString constructs an UnexpectedSequenceNumber error.
func NewUnexpectedSequenceNumberFromString(input string) *UnexpectedSequenceNumber {
    pieces := strings.Split(input, "unexpected sequence number:")
    if len(pieces) < 2 {
        return &UnexpectedSequenceNumber{}
    }
 
    var expected, actual uint64
    _, err := fmt.Sscanf(pieces[1], "%d, actual: %d", &expected, &actual)
    if err != nil {
        return &UnexpectedSequenceNumber{}
    }
 
    return &UnexpectedSequenceNumber{
        Expected:             expected,
        ActualSequenceNumber: actual,
    }
}
 
func (e UnexpectedSequenceNumber) Error() string {
    return fmt.Sprintf("unexpected sequence number: %d, actual: %d",
        e.Expected,
        e.ActualSequenceNumber,
    )
}