/
dataselect.go
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/
dataselect.go
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// Copyright 2017 The Kubernetes Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dataselect
import (
"errors"
"log"
"sort"
metricapi "github.com/kubernetes/dashboard/src/app/backend/integration/metric/api"
)
// GenericDataCell describes the interface of the data cell that contains all the necessary methods needed to perform
// complex data selection
// GenericDataSelect takes a list of these interfaces and performs selection operation.
// Therefore as long as the list is composed of GenericDataCells you can perform any data selection!
type DataCell interface {
// GetPropertyAtIndex returns the property of this data cell.
// Value returned has to have Compare method which is required by Sort functionality of DataSelect.
GetProperty(PropertyName) ComparableValue
}
// MetricDataCell extends interface of DataCells and additionally supports metric download.
type MetricDataCell interface {
DataCell
// GetResourceSelector returns ResourceSelector for this resource. The ResourceSelector can be used to get,
// HeapsterSelector which in turn can be used to download metrics.
GetResourceSelector() *metricapi.ResourceSelector
}
// ComparableValue hold any value that can be compared to its own kind.
type ComparableValue interface {
// Compares self with other value. Returns 1 if other value is smaller, 0 if they are the same, -1 if other is larger.
Compare(ComparableValue) int
// Returns true if self value contains or is equal to other value, false otherwise.
Contains(ComparableValue) bool
}
// SelectableData contains all the required data to perform data selection.
// It implements sort.Interface so its sortable under sort.Sort
// You can use its Select method to get selected GenericDataCell list.
type DataSelector struct {
// GenericDataList hold generic data cells that are being selected.
GenericDataList []DataCell
// DataSelectQuery holds instructions for data select.
DataSelectQuery *DataSelectQuery
// CachedResources stores resources that may be needed during data selection process
CachedResources *metricapi.CachedResources
// CumulativeMetricsPromises is a list of promises holding aggregated metrics for resources in GenericDataList.
// The metrics will be calculated after calling GetCumulativeMetrics method.
CumulativeMetricsPromises metricapi.MetricPromises
// MetricsPromises is a list of promises holding metrics for resources in GenericDataList.
// The metrics will be calculated after calling GetMetrics method. Metric will not be
// aggregated and can are used to display sparklines on pod list.
MetricsPromises metricapi.MetricPromises
}
// Implementation of sort.Interface so that we can use built-in sort function (sort.Sort) for sorting SelectableData
// Len returns the length of data inside SelectableData.
func (self DataSelector) Len() int { return len(self.GenericDataList) }
// Swap swaps 2 indices inside SelectableData.
func (self DataSelector) Swap(i, j int) {
self.GenericDataList[i], self.GenericDataList[j] = self.GenericDataList[j], self.GenericDataList[i]
}
// Less compares 2 indices inside SelectableData and returns true if first index is larger.
func (self DataSelector) Less(i, j int) bool {
for _, sortBy := range self.DataSelectQuery.SortQuery.SortByList {
a := self.GenericDataList[i].GetProperty(sortBy.Property)
b := self.GenericDataList[j].GetProperty(sortBy.Property)
// ignore sort completely if property name not found
if a == nil || b == nil {
break
}
cmp := a.Compare(b)
if cmp == 0 { // values are the same. Just continue to next sortBy
continue
} else { // values different
return (cmp == -1 && sortBy.Ascending) || (cmp == 1 && !sortBy.Ascending)
}
}
return false
}
// Sort sorts the data inside as instructed by DataSelectQuery and returns itself to allow method chaining.
func (self *DataSelector) Sort() *DataSelector {
sort.Sort(*self)
return self
}
// Filter the data inside as instructed by DataSelectQuery and returns itself to allow method chaining.
func (self *DataSelector) Filter() *DataSelector {
filteredList := []DataCell{}
for _, c := range self.GenericDataList {
matches := true
for _, filterBy := range self.DataSelectQuery.FilterQuery.FilterByList {
v := c.GetProperty(filterBy.Property)
if v == nil || !v.Contains(filterBy.Value) {
matches = false
break
}
}
if matches {
filteredList = append(filteredList, c)
}
}
self.GenericDataList = filteredList
return self
}
func (self *DataSelector) getMetrics(metricClient metricapi.MetricClient) (
[]metricapi.MetricPromises, error) {
metricPromises := make([]metricapi.MetricPromises, 0)
if metricClient == nil {
return metricPromises, errors.New("No metric client provided. Skipping metrics.")
}
metricNames := self.DataSelectQuery.MetricQuery.MetricNames
if metricNames == nil {
return metricPromises, errors.New("No metrics specified. Skipping metrics.")
}
selectors := make([]metricapi.ResourceSelector, len(self.GenericDataList))
for i, dataCell := range self.GenericDataList {
// make sure data cells support metrics
metricDataCell, ok := dataCell.(MetricDataCell)
if !ok {
log.Printf("Data cell does not implement MetricDataCell. Skipping. %v", dataCell)
continue
}
selectors[i] = *metricDataCell.GetResourceSelector()
}
for _, metricName := range metricNames {
promises := metricClient.DownloadMetric(selectors, metricName, self.CachedResources)
metricPromises = append(metricPromises, promises)
}
return metricPromises, nil
}
// GetMetrics downloads metrics for data cells currently present in self.GenericDataList as instructed
// by MetricQuery and inserts resulting MetricPromises to self.MetricsPromises.
func (self *DataSelector) GetMetrics(metricClient metricapi.MetricClient) *DataSelector {
metricPromisesList, err := self.getMetrics(metricClient)
if err != nil {
log.Print(err)
return self
}
metricPromises := make(metricapi.MetricPromises, 0)
for _, promises := range metricPromisesList {
metricPromises = append(metricPromises, promises...)
}
self.MetricsPromises = metricPromises
return self
}
// GetCumulativeMetrics downloads and aggregates metrics for data cells currently present in self.GenericDataList as instructed
// by MetricQuery and inserts resulting MetricPromises to self.CumulativeMetricsPromises.
func (self *DataSelector) GetCumulativeMetrics(metricClient metricapi.MetricClient) *DataSelector {
metricPromisesList, err := self.getMetrics(metricClient)
if err != nil {
log.Print(err)
return self
}
metricNames := self.DataSelectQuery.MetricQuery.MetricNames
if metricNames == nil {
log.Print("No metrics specified. Skipping metrics.")
return self
}
aggregations := self.DataSelectQuery.MetricQuery.Aggregations
if aggregations == nil {
aggregations = metricapi.OnlyDefaultAggregation
}
metricPromises := make(metricapi.MetricPromises, 0)
for i, metricName := range metricNames {
promises := metricClient.AggregateMetrics(metricPromisesList[i], metricName, aggregations)
metricPromises = append(metricPromises, promises...)
}
self.CumulativeMetricsPromises = metricPromises
return self
}
// Paginates the data inside as instructed by DataSelectQuery and returns itself to allow method chaining.
func (self *DataSelector) Paginate() *DataSelector {
pQuery := self.DataSelectQuery.PaginationQuery
dataList := self.GenericDataList
startIndex, endIndex := pQuery.GetPaginationSettings(len(dataList))
// Return all items if provided settings do not meet requirements
if !pQuery.IsValidPagination() {
return self
}
// Return no items if requested page does not exist
if !pQuery.IsPageAvailable(len(self.GenericDataList), startIndex) {
self.GenericDataList = []DataCell{}
return self
}
self.GenericDataList = dataList[startIndex:endIndex]
return self
}
// GenericDataSelect takes a list of GenericDataCells and DataSelectQuery and returns selected data as instructed by dsQuery.
func GenericDataSelect(dataList []DataCell, dsQuery *DataSelectQuery) []DataCell {
SelectableData := DataSelector{
GenericDataList: dataList,
DataSelectQuery: dsQuery,
}
return SelectableData.Sort().Paginate().GenericDataList
}
// GenericDataSelectWithFilter takes a list of GenericDataCells and DataSelectQuery and returns selected data as instructed by dsQuery.
func GenericDataSelectWithFilter(dataList []DataCell, dsQuery *DataSelectQuery) ([]DataCell, int) {
SelectableData := DataSelector{
GenericDataList: dataList,
DataSelectQuery: dsQuery,
}
// Pipeline is Filter -> Sort -> CollectMetrics -> Paginate
filtered := SelectableData.Filter()
filteredTotal := len(filtered.GenericDataList)
processed := filtered.Sort().Paginate()
return processed.GenericDataList, filteredTotal
}
// GenericDataSelect takes a list of GenericDataCells and DataSelectQuery and returns selected data as instructed by dsQuery.
func GenericDataSelectWithMetrics(dataList []DataCell, dsQuery *DataSelectQuery,
cachedResources *metricapi.CachedResources, metricClient metricapi.MetricClient) (
[]DataCell, metricapi.MetricPromises) {
SelectableData := DataSelector{
GenericDataList: dataList,
DataSelectQuery: dsQuery,
CachedResources: cachedResources,
}
// Pipeline is Filter -> Sort -> CollectMetrics -> Paginate
processed := SelectableData.Sort().GetCumulativeMetrics(metricClient).Paginate()
return processed.GenericDataList, processed.CumulativeMetricsPromises
}
// GenericDataSelect takes a list of GenericDataCells and DataSelectQuery and returns selected data as instructed by dsQuery.
func GenericDataSelectWithFilterAndMetrics(dataList []DataCell, dsQuery *DataSelectQuery,
cachedResources *metricapi.CachedResources, metricClient metricapi.MetricClient) (
[]DataCell, metricapi.MetricPromises, int) {
SelectableData := DataSelector{
GenericDataList: dataList,
DataSelectQuery: dsQuery,
CachedResources: cachedResources,
}
// Pipeline is Filter -> Sort -> CollectMetrics -> Paginate
filtered := SelectableData.Filter()
filteredTotal := len(filtered.GenericDataList)
processed := filtered.Sort().GetCumulativeMetrics(metricClient).Paginate()
return processed.GenericDataList, processed.CumulativeMetricsPromises, filteredTotal
}
// PodListMetrics returns metrics for every resource on the dataList without aggregating data.
func PodListMetrics(dataList []DataCell, dsQuery *DataSelectQuery,
metricClient metricapi.MetricClient) metricapi.MetricPromises {
selectableData := DataSelector{
GenericDataList: dataList,
DataSelectQuery: dsQuery,
CachedResources: metricapi.NoResourceCache,
}
processed := selectableData.GetMetrics(metricClient)
return processed.MetricsPromises
}