package iterator
import (
"context"
"sort"
"github.com/xanzy/go-gitlab"
)
// Since Gitlab does not return the label events items in the correct order
// we need to sort the list ourselves and stop relying on the pagination model
// #BecauseGitlab
type labelEventIterator struct {
issue int
index int
cache []*gitlab.LabelEvent
}
func newLabelEventIterator() *labelEventIterator {
lei := &labelEventIterator{}
lei.Reset(-1)
return lei
}
func (lei *labelEventIterator) Next(ctx context.Context, conf config) (bool, error) {
// first query
if lei.cache == nil {
return lei.getNext(ctx, conf)
}
// move cursor index
if lei.index < len(lei.cache)-1 {
lei.index++
return true, nil
}
return false, nil
}
func (lei *labelEventIterator) Value() *gitlab.LabelEvent {
return lei.cache[lei.index]
}
func (lei *labelEventIterator) getNext(ctx context.Context, conf config) (bool, error) {
ctx, cancel := context.WithTimeout(ctx, conf.timeout)
defer cancel()
// since order is not guaranteed we should query all label events
// and sort them by ID
page := 1
for {
labelEvents, _, err := conf.gc.ResourceLabelEvents.ListIssueLabelEvents(
conf.project,
lei.issue,
&gitlab.ListLabelEventsOptions{
ListOptions: gitlab.ListOptions{
Page: page,
PerPage: conf.capacity,
},
},
gitlab.WithContext(ctx),
)
if err != nil {
lei.Reset(-1)
return false, err
}
if len(labelEvents) == 0 {
break
}
lei.cache = append(lei.cache, labelEvents...)
page++
}
sort.Sort(lei)
lei.index = 0
return len(lei.cache) > 0, nil
}
func (lei *labelEventIterator) Reset(issue int) {
lei.issue = issue
lei.index = -1
lei.cache = nil
}
// ORDERING
func (lei *labelEventIterator) Len() int {
return len(lei.cache)
}
func (lei *labelEventIterator) Swap(i, j int) {
lei.cache[i], lei.cache[j] = lei.cache[j], lei.cache[i]
}
func (lei *labelEventIterator) Less(i, j int) bool {
return lei.cache[i].ID < lei.cache[j].ID
}
