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//go:generate genny -in=connection_template.go -out=gen_bug.go gen "NodeType=string EdgeType=LazyBugEdge ConnectionType=models.BugConnection"
//go:generate genny -in=connection_template.go -out=gen_operation.go gen "NodeType=bug.Operation EdgeType=models.OperationEdge ConnectionType=models.OperationConnection"
//go:generate genny -in=connection_template.go -out=gen_comment.go gen "NodeType=bug.Comment EdgeType=models.CommentEdge ConnectionType=models.CommentConnection"
package connections
import (
"encoding/base64"
"fmt"
"strconv"
"strings"
)
const cursorPrefix = "cursor:"
// Edge define the contract for an edge in a relay connection
type Edge interface {
GetCursor() string
}
// OffsetToCursor create the cursor string from an offset
func OffsetToCursor(offset int) string {
str := fmt.Sprintf("%v%v", cursorPrefix, offset)
return base64.StdEncoding.EncodeToString([]byte(str))
}
// CursorToOffset re-derives the offset from the cursor string.
func CursorToOffset(cursor string) (int, error) {
str := ""
b, err := base64.StdEncoding.DecodeString(cursor)
if err == nil {
str = string(b)
}
str = strings.Replace(str, cursorPrefix, "", -1)
offset, err := strconv.Atoi(str)
if err != nil {
return 0, fmt.Errorf("Invalid cursor")
}
return offset, nil
}
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