forked from Gitlink/gitlink-cli
126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package client
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import (
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"encoding/json"
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"fmt"
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"net/url"
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"strconv"
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)
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// maxPaginationPages caps auto-pagination as a safety guard against
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// endpoints that ignore the page parameter and keep returning data.
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const maxPaginationPages = 1000
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// PaginateAll fetches all pages and returns combined results.
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// The list array is auto-detected inside the response body.
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func (c *Client) PaginateAll(path string, params url.Values) ([]json.RawMessage, error) {
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return c.PaginateAllKey(path, params, "")
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}
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// PaginateAllKey fetches all pages, extracting the list array from the
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// response field named listKey (e.g. "issues", "pulls", "branches").
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// When listKey is empty the array is auto-detected: top-level arrays,
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// the conventional "data" wrapper, or a unique array-valued field.
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// Pagination stops when a page returns fewer items than the limit, when
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// total_count (if reported) is reached, or at the safety page cap.
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func (c *Client) PaginateAllKey(path string, params url.Values, listKey string) ([]json.RawMessage, error) {
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if params == nil {
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params = url.Values{}
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}
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if params.Get("limit") == "" {
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params.Set("limit", "50")
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}
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var all []json.RawMessage
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totalCount := -1
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for page := 1; page <= maxPaginationPages; page++ {
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params.Set("page", strconv.Itoa(page))
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env, err := c.Get(path, params)
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if err != nil {
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return nil, err
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}
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if !env.OK {
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return nil, fmt.Errorf("API error on page %d", page)
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}
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items, pageTotal, isList := extractListItems(env.Data, listKey)
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if !isList {
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if page == 1 {
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raw, _ := json.Marshal(env.Data)
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return []json.RawMessage{raw}, nil
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}
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break
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}
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if pageTotal >= 0 {
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totalCount = pageTotal
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}
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if len(items) == 0 {
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break
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}
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all = append(all, items...)
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if totalCount >= 0 && len(all) >= totalCount {
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break
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}
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limit, _ := strconv.Atoi(params.Get("limit"))
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if len(items) < limit {
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break
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}
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}
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return all, nil
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}
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// extractListItems locates the list array inside a decoded response body.
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// It returns the items, the reported total_count (-1 when absent) and
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// whether a list array was found at all.
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func extractListItems(data interface{}, listKey string) ([]json.RawMessage, int, bool) {
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switch v := data.(type) {
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case []interface{}:
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return marshalItems(v), -1, true
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case map[string]interface{}:
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total := -1
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if tc, ok := v["total_count"].(float64); ok {
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total = int(tc)
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} else if tc, ok := v["count"].(float64); ok {
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// Some endpoints (e.g. /users/:login/projects) report "count".
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total = int(tc)
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}
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if listKey != "" {
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if slice, ok := v[listKey].([]interface{}); ok {
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return marshalItems(slice), total, true
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}
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return nil, total, false
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}
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if slice, ok := v["data"].([]interface{}); ok {
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return marshalItems(slice), total, true
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}
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// Auto-detect: GitLink v1 list endpoints wrap the array in a
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// resource-named field ({"total_count":N,"issues":[...]}).
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var found []interface{}
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arrays := 0
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for _, val := range v {
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if slice, ok := val.([]interface{}); ok {
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arrays++
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found = slice
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}
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}
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if arrays == 1 {
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return marshalItems(found), total, true
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}
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return nil, total, false
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}
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return nil, -1, false
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}
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func marshalItems(items []interface{}) []json.RawMessage {
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out := make([]json.RawMessage, 0, len(items))
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for _, item := range items {
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raw, _ := json.Marshal(item)
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out = append(out, raw)
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}
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return out
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}
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