79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package cmdutil
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import (
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"context"
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"go.probo.inc/probo/pkg/page"
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)
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// paginatePageSize is the per-request fetch size used to walk a cursor
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// connection. It is independent of the caller's --limit, which only
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// bounds the total returned.
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const paginatePageSize = 100
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// Paginate walks a cursor-paginated coredata Load into a single slice,
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// following the keyset cursor until the caller's limit is reached or the
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// connection is exhausted. A limit <= 0 returns every matching row. This
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// is the proboctl-side counterpart of the API's connection resolvers: it
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// drives page.NewCursor + page.NewPage against the same coredata Load
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// methods, so a future proboctl API can reuse the data layer untouched.
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func Paginate[E page.Paginable[F], F page.OrderField](
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ctx context.Context,
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orderBy page.OrderBy[F],
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limit int,
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load func(ctx context.Context, cursor *page.Cursor[F]) ([]E, error),
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) ([]E, error) {
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var (
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result []E
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from *page.CursorKey
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)
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for {
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size := paginatePageSize
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if limit > 0 {
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remaining := limit - len(result)
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if remaining <= 0 {
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break
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}
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if remaining < size {
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size = remaining
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}
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}
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cursor := page.NewCursor(size, from, page.Head, orderBy)
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rows, err := load(ctx, cursor)
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if err != nil {
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return nil, err
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}
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p := page.NewPage(rows, cursor)
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result = append(result, p.Data...)
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if !p.Info.HasNext || len(p.Data) == 0 {
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break
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}
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key := p.Data[len(p.Data)-1].CursorKey(orderBy.Field)
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from = &key
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}
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return result, nil
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}
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