feat(api): trigger noisiness

api/controller/paginate.go

@@ -0,0 +1,26 @@
+package controller
+
+// applyPagination returns entities[page*size:(page+1)*size] if possible.
+// If bad page and size are given or out of range than empty slice []T is returned.
+func applyPagination[T any](page, size, total int64, entities []T) []T {
+	if page < 0 || (page > 0 && size < 0) {
+		return make([]T, 0)
+	}
+
+	if page >= 0 && size >= 0 {
+		start := page * size
+		end := start + size
+
+		if start >= total {
+			return make([]T, 0)
+		} else {
+			if end > total {
+				end = total
+			}
+
+			return entities[start:end]
+		}
+	}
+
+	return entities
+}

api/controller/paginate_test.go

@@ -0,0 +1,122 @@
+package controller
+
+import (
+	"fmt"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func Test_applyPaginate(t *testing.T) {
+	Convey("Test paginating", t, func() {
+		entities := make([]int, 0, 'z'-'a'+1)
+		for i := 0; i < 40; i++ {
+			entities = append(entities, i)
+		}
+
+		type testcase struct {
+			page             int64
+			size             int64
+			total            int64
+			givenEntities    []int
+			expectedEntities []int
+			desc             string
+		}
+
+		cases := []testcase{
+			{
+				page:             -1,
+				givenEntities:    entities,
+				expectedEntities: []int{},
+				desc:             "with negative page",
+			},
+			{
+				page:             1,
+				size:             -1,
+				givenEntities:    entities,
+				expectedEntities: []int{},
+				desc:             "with positive page and negative size",
+			},
+			{
+				page:             1,
+				size:             10,
+				total:            7,
+				givenEntities:    entities,
+				expectedEntities: []int{},
+				desc:             "out of range",
+			},
+			{
+				page:             0,
+				size:             -1,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: entities,
+				desc:             "fetch all entities",
+			},
+			{
+				page:             0,
+				size:             -2,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: entities,
+				desc:             "again fetch all entities",
+			},
+			{
+				page:             0,
+				size:             7,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: []int{0, 1, 2, 3, 4, 5, 6},
+				desc:             "first page with size 7 (page = 0)",
+			},
+			{
+				page:             1,
+				size:             7,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: []int{7, 8, 9, 10, 11, 12, 13},
+				desc:             "second page with size 7 (page = 1)",
+			},
+			{
+				page:             2,
+				size:             7,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: []int{14, 15, 16, 17, 18, 19, 20},
+				desc:             "third page with size 7 (page = 2)",
+			},
+			{
+				page:             3,
+				size:             7,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: []int{21, 22, 23, 24, 25, 26, 27},
+				desc:             "forth page with size 7 (page = 3)",
+			},
+			{
+				page:             4,
+				size:             7,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: []int{28, 29, 30, 31, 32, 33, 34},
+				desc:             "fifth page with size 7 (page = 4)",
+			},
+			{
+				page:             5,
+				size:             7,
+				total:            int64(len(entities)),
+				givenEntities:    entities,
+				expectedEntities: []int{35, 36, 37, 38, 39},
+				desc:             "last page with size 7 (page = 5)",
+			},
+		}
+
+		for i, tcase := range cases {
+			Convey(fmt.Sprintf("Case %v: %s", i+1, tcase.desc), func() {
+				gotEntities := applyPagination[int](tcase.page, tcase.size, tcase.total, tcase.givenEntities)
+
+				So(gotEntities, ShouldResemble, tcase.expectedEntities)
+			})
+		}
+	})
+}

api/controller/triggers.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"math"
 	"regexp"
+	"slices"
+	"strings"
 
 	"github.com/gofrs/uuid"
 
@@ -213,3 +215,108 @@ func triggerExists(database moira.Database, triggerID string) (bool, error) {
 	}
 	return true, nil
 }
+
+// GetTriggerNoisiness get triggers with amount of events (within time range [from, to])
+// and sorts by events_count according to sortOrder.
+func GetTriggerNoisiness(
+	database moira.Database,
+	page, size int64,
+	from, to string,
+	sortOrder api.SortOrder,
+) (*dto.TriggerNoisinessList, *api.ErrorResponse) {
+	triggerIDs, err := database.GetAllTriggerIDs()
+	if err != nil {
+		return nil, api.ErrorInternalServer(err)
+	}
+
+	triggerIDsWithEventsCount := getTriggerIDsWithEventsCount(database, triggerIDs, from, to)
+
+	sortTriggerIDsByEventsCount(triggerIDsWithEventsCount, sortOrder)
+
+	total := int64(len(triggerIDsWithEventsCount))
+
+	resDto := dto.TriggerNoisinessList{
+		List:  []dto.TriggerNoisiness{},
+		Page:  page,
+		Size:  size,
+		Total: total,
+	}
+
+	triggerIDsWithEventsCount = applyPagination[triggerIDWithEventsCount](page, size, total, triggerIDsWithEventsCount)
+	if len(triggerIDsWithEventsCount) == 0 {
+		return &resDto, nil
+	}
+
+	triggers, err := getTriggerChecks(database, onlyTriggerIDs(triggerIDsWithEventsCount))
+	if err != nil {
+		return nil, api.ErrorInternalServer(err)
+	}
+
+	if len(triggers) != len(triggerIDsWithEventsCount) {
+		return nil, api.ErrorInternalServer(fmt.Errorf("failed to fetch triggers for such range"))
+	}
+
+	resDto.List = make([]dto.TriggerNoisiness, 0, len(triggers))
+	for i := range triggers {
+		resDto.List = append(resDto.List, dto.TriggerNoisiness{
+			Trigger: dto.Trigger{
+				TriggerModel: dto.CreateTriggerModel(&triggers[i].Trigger),
+				Throttling:   triggers[i].Throttling,
+			},
+			EventsCount: triggerIDsWithEventsCount[i].eventsCount,
+		})
+	}
+
+	return &resDto, nil
+}
+
+type triggerIDWithEventsCount struct {
+	triggerID   string
+	eventsCount int64
+}
+
+func getTriggerIDsWithEventsCount(
+	database moira.Database,
+	triggerIDs []string,
+	from, to string,
+) []triggerIDWithEventsCount {
+	resultTriggerIDs := make([]triggerIDWithEventsCount, 0, len(triggerIDs))
+
+	for _, triggerID := range triggerIDs {
+		eventsCount := database.GetNotificationEventCount(triggerID, from, to)
+		resultTriggerIDs = append(resultTriggerIDs, triggerIDWithEventsCount{
+			triggerID:   triggerID,
+			eventsCount: eventsCount,
+		})
+	}
+
+	return resultTriggerIDs
+}
+
+func sortTriggerIDsByEventsCount(idsWithCount []triggerIDWithEventsCount, sortOrder api.SortOrder) {
+	if sortOrder == api.AscSortOrder || sortOrder == api.DescSortOrder {
+		slices.SortFunc(idsWithCount, func(first, second triggerIDWithEventsCount) int {
+			cmpRes := first.eventsCount - second.eventsCount
+
+			if cmpRes == 0 {
+				return strings.Compare(first.triggerID, second.triggerID)
+			}
+
+			if sortOrder == api.DescSortOrder {
+				cmpRes *= -1
+			}
+
+			return int(cmpRes)
+		})
+	}
+}
+
+func onlyTriggerIDs(idsWithCount []triggerIDWithEventsCount) []string {
+	triggerIDs := make([]string, 0, len(idsWithCount))
+
+	for _, idWithCount := range idsWithCount {
+		triggerIDs = append(triggerIDs, idWithCount.triggerID)
+	}
+
+	return triggerIDs
+}