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Monorepo for Tangled tangled.org
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1.2 kB · 77 lines
Go
at next-dev
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778package pagination
import "context"
type Page struct { Offset int // where to start from Limit int // number of items in a page}
func FirstPage() Page { return Page{ Offset: 0, Limit: 30, }}
type ctxKey struct{}
func IntoContext(ctx context.Context, page Page) context.Context { return context.WithValue(ctx, ctxKey{}, page)}
func FromContext(ctx context.Context) Page { if ctx == nil { return FirstPage() } v := ctx.Value(ctxKey{}) if v == nil { return FirstPage() } page, ok := v.(Page) if !ok { return FirstPage() } return page}
func (p Page) Previous() Page { if p.Offset-p.Limit < 0 { return FirstPage() } else { return Page{ Offset: p.Offset - p.Limit, Limit: p.Limit, } }}
func (p Page) Next() Page { return Page{ Offset: p.Offset + p.Limit, Limit: p.Limit, }}
func IterateAll[T any]( fetch func(page Page) ([]T, error), handle func(items []T) error,) error { page := FirstPage() for { items, err := fetch(page) if err != nil { return err }
err = handle(items) if err != nil { return err } if len(items) < page.Limit { break } page = page.Next() } return nil}