88 lines
2.1 KiB
Go
88 lines
2.1 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 api
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import (
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"encoding/json"
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"fmt"
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"maps"
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)
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type (
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PageInfo struct {
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HasNextPage bool `json:"hasNextPage"`
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EndCursor *string `json:"endCursor"`
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}
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Edge[T any] struct {
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Node T `json:"node"`
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}
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Connection[T any] struct {
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TotalCount int `json:"totalCount"`
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Edges []Edge[T] `json:"edges"`
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PageInfo PageInfo `json:"pageInfo"`
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}
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)
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// Paginate fetches all pages of a connection up to limit items. The extract
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// function pulls the Connection out of the raw GraphQL response data.
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func Paginate[T any](
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client *Client,
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query string,
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variables map[string]any,
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limit int,
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extract func(json.RawMessage) (*Connection[T], error),
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) ([]T, int, error) {
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vars := maps.Clone(variables)
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var (
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nodes = make([]T, 0)
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totalCount int
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)
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for {
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remaining := limit - len(nodes)
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if remaining <= 0 {
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break
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}
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vars["first"] = remaining
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data, err := client.Do(query, vars)
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if err != nil {
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return nil, 0, err
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}
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conn, err := extract(data)
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if err != nil {
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return nil, 0, fmt.Errorf("cannot parse response: %w", err)
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}
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totalCount = conn.TotalCount
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for _, edge := range conn.Edges {
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nodes = append(nodes, edge.Node)
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}
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if !conn.PageInfo.HasNextPage || conn.PageInfo.EndCursor == nil {
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break
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}
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vars["after"] = *conn.PageInfo.EndCursor
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}
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return nodes, totalCount, nil
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}
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