43 lines
1 KiB
Go
43 lines
1 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package utils
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// Pager fetches all items from a paginated API.
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// Pager is a generic function that fetches and aggregates paginated data.
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// It takes a fetch function and a perPage parameter as arguments.
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//
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// The fetch function is responsible for retrieving a slice of items of type T
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// for a given page number. It returns the fetched items and an error, if any.
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// Ideally a developer may want to use a closure to create a fetch function.
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//
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// The perPage parameter specifies the number of items to fetch per page.
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//
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// Example usage:
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//
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// items, err := Pager(fetchFunc, 10)
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// if err != nil {
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// // handle error
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// }
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// // process items
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func Pager[T any](fetch func(page int) ([]T, error), perPage int) ([]T, error) {
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var list []T
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var page int
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for {
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fetched, err := fetch(page)
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if err != nil {
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return list, err
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}
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list = append(list, fetched...)
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if len(fetched) < perPage {
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break
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}
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page++
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}
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return list, nil
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}
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