/
metric.go
290 lines (268 loc) · 8.41 KB
/
metric.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* 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
*
* https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package metric
import (
"encoding/json"
"fmt"
influxclient "github.com/influxdata/influxdb1-client/v2"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/validation/field"
"sort"
"strings"
"time"
"tkestack.io/tke/api/monitor"
"tkestack.io/tke/pkg/monitor/storage/types"
"tkestack.io/tke/pkg/monitor/util"
"tkestack.io/tke/pkg/util/log"
)
func (s *InfluxDB) Query(query *monitor.MetricQuery) (*types.MetricMergedResult, error) {
metricsReq, err := s.buildMetricsRequest(query)
if err != nil {
return nil, err
}
var results []types.MetricResult
for dbname, cmd := range metricsReq {
log.Debugf("query db %s, cmd:%s", dbname, cmd)
influxQuery := influxclient.NewQuery(cmd, dbname, "s")
res, err := s.availableClient.Query(influxQuery)
if err != nil || res.Error() != nil {
if err != nil {
log.Error("Failed to connect on previous influxDB client", log.Err(err))
} else if res.Error() != nil {
log.Error("Failed to query on previous influxDB client", log.Err(res.Error()))
}
// todo: need lock the available influxDB client?
log.Info("Starting to find available influxDB client")
// check available influxDB client. Shall we check the abstract error, such as "connection refused" or "timeout"
for _, db := range s.clients {
if db == s.availableClient {
_ = s.availableClient.Close()
continue
}
res, err = db.Query(influxQuery)
if err == nil && res.Error() == nil {
log.Warn("InfluxDB client changed")
s.availableClient = db
break
}
_ = db.Close()
}
}
if err != nil {
_ = s.availableClient.Close()
return nil, errors.NewBadRequest(err.Error())
} else if res.Error() != nil {
_ = s.availableClient.Close()
return nil, errors.NewBadRequest(res.Error().Error())
} else {
for _, r := range res.Results {
if r.Series == nil || len(r.Series) == 0 {
log.Errorf("Nil query result from db(%s): %s", dbname, cmd)
continue
}
metricRes := types.MetricResult{}
metricRes.Series = r.Series
// TODO get max/avg value
results = append(results, metricRes)
}
}
}
return MergeResult(results, query.GroupBy, query.Fields), nil
}
func (s *InfluxDB) buildMetricsRequest(query *monitor.MetricQuery) (map[string]string, error) {
// get cluster name
cluster := ""
// get query condition
conditionStr := ""
if len(query.Conditions) > 0 {
for _, v := range query.Conditions {
if v.Key == "tke_cluster_instance_id" {
cluster = v.Value
continue
}
conditionStr += fmt.Sprintf("%s%s'%s' and ", v.Key, v.Expr, v.Value)
}
}
cluster = util.RenameInfluxDB(cluster)
// get start time
timeRange := ""
startT := query.StartTime
if startT == nil {
return nil, errors.NewInvalid(monitor.Kind("Metric"), "query", field.ErrorList{
field.Required(field.NewPath("query", "startTime"), "must be specify"),
})
}
timeRange += fmt.Sprintf("time >= '%s' ", timestampToUTCStr(startT))
// get end time
endT := query.EndTime
if endT != nil {
timeRange += fmt.Sprintf("and time < '%s' ", timestampToUTCStr(endT))
}
// parse group by
byStr := strings.Join(query.GroupBy, ",")
byStr = strings.ReplaceAll(byStr, "timestamp", "time")
if len(byStr) == 0 {
byStr = "time(60s)"
}
// map cluster => selects, batch select multi query from db just once
metricsReq := make(map[string]string)
for _, fieldStr := range query.Fields {
index := strings.Index(fieldStr, "(")
if index == -1 {
log.Warnf("Wrong field(%s), should be expr(resource_name)", fieldStr)
continue
}
expr := fieldStr[:index]
resource := fieldStr[index+1 : len(fieldStr)-1]
// project metrics should handle differently
if strings.HasPrefix(resource, "project_") {
query, err := parseProjectRequest(resource, conditionStr, timeRange, byStr)
if err != nil {
log.Errorf("Wrong project query: %v", err)
continue
}
if _, ok := metricsReq[util.ProjectDatabaseName]; ok {
metricsReq[util.ProjectDatabaseName] = metricsReq[util.ProjectDatabaseName] + ";" + query
} else {
metricsReq[util.ProjectDatabaseName] = query
}
continue
}
// struct the whole query format
query := fmt.Sprintf("select %s(value) as %s from %s where %s %s group by %s", expr, resource, resource, conditionStr, timeRange, byStr)
if _, ok := metricsReq[cluster]; ok {
metricsReq[cluster] = metricsReq[cluster] + "; " + query
} else {
metricsReq[cluster] = query
}
}
return metricsReq, nil
}
func MergeResult(results []types.MetricResult, groupByAndTimestamp []string, fields []string) *types.MetricMergedResult {
log.Debug("Merge influxDB query result")
if len(results) == 0 {
return &types.MetricMergedResult{
Columns: []string{},
Data: []interface{}{},
}
}
maxSeriesLen := 0
for _, result := range results {
if maxSeriesLen < len(result.Series) {
maxSeriesLen = len(result.Series)
}
}
maxValueSize := 0
for _, result := range results {
for _, row := range result.Series {
if maxValueSize < len(row.Values) {
maxValueSize = len(row.Values)
}
}
}
var groupBy []string
var timestamp string
for i, group := range groupByAndTimestamp {
if strings.Split(group, "(")[0] == "timestamp" {
timestamp = group
groupBy = append(groupByAndTimestamp[:i], groupByAndTimestamp[i+1:]...)
break
}
}
if len(groupByAndTimestamp) == 0 {
timestamp = "timestamp(60s)"
}
renameFields := make(map[string]string)
for _, fld := range fields {
index := strings.Index(fld, "(")
if index == -1 {
continue
}
expr := fld[:index]
resource := fld[index+1 : len(fld)-1]
renameFields[resource] = resource + "_" + expr
}
columns := make([]string, 1+len(results)+len(groupBy))
columns[0] = timestamp
for i, result := range results {
if len(result.Series) > 0 {
columns[i+1] = renameFields[result.Series[0].Name]
}
}
for i, group := range groupBy {
columns[1+len(results)+i] = group
}
values := make([]interface{}, maxValueSize*maxSeriesLen)
for i := 0; i < maxValueSize*maxSeriesLen; i++ {
values[i] = make([]interface{}, 1+len(results)+len(groupBy))
}
// tagIndex shows the index of one row in series according to its tag
tagIndex := make(map[string]int)
for fieldIndex, result := range results {
for _, row := range result.Series {
var sortedKey []string
var sortedKV []string
for k := range row.Tags {
sortedKey = append(sortedKey, k)
}
sort.Strings(sortedKey)
for _, k := range sortedKey {
sortedKV = append(sortedKV, fmt.Sprintf("%v:%v", k, row.Tags[k]))
}
tagValue := strings.Join(sortedKV, ",")
_, ok := tagIndex[tagValue]
if !ok {
tagIndex[tagValue] = len(tagIndex)
}
ti := tagIndex[tagValue]
for i, v := range row.Values {
val := values[i*maxSeriesLen+ti].([]interface{})
if val[0] == nil {
sec := v[0].(json.Number)
secNum, _ := sec.Int64()
val[0] = secNum * 1000
for groupIndex, group := range groupBy {
val[1+len(results)+groupIndex] = row.Tags[group]
}
}
val[1+fieldIndex] = v[1]
}
}
}
return &types.MetricMergedResult{
Columns: columns,
Data: values,
}
}
// parseProjectRequest parse metrics requests for project, should first sum, then select
func parseProjectRequest(resource, condition, timeRange, byStr string) (string, error) {
byStrNew := byStr
if !strings.Contains(byStr, "time(60s)") {
indexHalf := strings.Index(byStr, "time(")
indexLast := strings.Index(byStr, "s)")
byStrNew = byStr[:indexHalf] + "time(60s)" + byStr[indexLast+2:]
}
// first sum, then select
query := fmt.Sprintf("select mean(sum) as %s from (select sum(value) from %s where %s %s group by %s ) where %s group by %s",
resource, resource, condition, timeRange, byStrNew, timeRange, byStr)
return query, nil
}
func timestampToUTCStr(msec *int64) string {
tt := time.Unix(*msec/1000, 0)
return tt.UTC().String()[:19]
}