mirror of
https://github.com/ClusterCockpit/cc-backend
synced 2024-09-20 11:27:26 +02:00
445 lines
12 KiB
Go
445 lines
12 KiB
Go
// Copyright (C) 2022 DKRZ
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// All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package metricdata
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"math"
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"net/http"
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"os"
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"regexp"
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"sort"
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"strings"
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"sync"
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"text/template"
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"time"
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"github.com/ClusterCockpit/cc-backend/pkg/archive"
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"github.com/ClusterCockpit/cc-backend/pkg/log"
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"github.com/ClusterCockpit/cc-backend/pkg/schema"
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promapi "github.com/prometheus/client_golang/api"
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promv1 "github.com/prometheus/client_golang/api/prometheus/v1"
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promcfg "github.com/prometheus/common/config"
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promm "github.com/prometheus/common/model"
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)
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type PrometheusDataRepositoryConfig struct {
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Url string `json:"url"`
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Username string `json:"username,omitempty"`
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Suffix string `json:"suffix,omitempty"`
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Templates map[string]string `json:"query-templates"`
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}
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type PrometheusDataRepository struct {
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client promapi.Client
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queryClient promv1.API
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suffix string
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templates map[string]*template.Template
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}
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type PromQLArgs struct {
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Nodes string
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}
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type Trie map[rune]Trie
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var logOnce sync.Once
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func contains(s []schema.MetricScope, str schema.MetricScope) bool {
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for _, v := range s {
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if v == str {
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return true
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}
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}
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return false
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}
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func MinMaxMean(data []schema.Float) (float64, float64, float64) {
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if len(data) == 0 {
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return 0.0, 0.0, 0.0
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}
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min := math.MaxFloat64
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max := -math.MaxFloat64
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var sum float64
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var n float64
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for _, val := range data {
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if val.IsNaN() {
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continue
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}
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sum += float64(val)
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n += 1
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if float64(val) > max {
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max = float64(val)
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}
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if float64(val) < min {
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min = float64(val)
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}
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}
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return min, max, sum / n
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}
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// Rewritten from
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// https://github.com/ermanh/trieregex/blob/master/trieregex/trieregex.py
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func nodeRegex(nodes []string) string {
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root := Trie{}
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// add runes of each compute node to trie
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for _, node := range nodes {
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_trie := root
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for _, c := range node {
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if _, ok := _trie[c]; !ok {
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_trie[c] = Trie{}
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}
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_trie = _trie[c]
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}
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_trie['*'] = Trie{}
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}
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// recursively build regex from rune trie
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var trieRegex func(trie Trie, reset bool) string
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trieRegex = func(trie Trie, reset bool) string {
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if reset == true {
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trie = root
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}
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if len(trie) == 0 {
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return ""
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}
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if len(trie) == 1 {
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for key, _trie := range trie {
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if key == '*' {
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return ""
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}
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return regexp.QuoteMeta(string(key)) + trieRegex(_trie, false)
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}
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} else {
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sequences := []string{}
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for key, _trie := range trie {
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if key != '*' {
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sequences = append(sequences, regexp.QuoteMeta(string(key))+trieRegex(_trie, false))
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}
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}
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sort.Slice(sequences, func(i, j int) bool {
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return (-len(sequences[i]) < -len(sequences[j])) || (sequences[i] < sequences[j])
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})
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var result string
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// single edge from this tree node
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if len(sequences) == 1 {
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result = sequences[0]
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if len(result) > 1 {
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result = "(?:" + result + ")"
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}
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// multiple edges, each length 1
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} else if s := strings.Join(sequences, ""); len(s) == len(sequences) {
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// char or numeric range
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if len(s)-1 == int(s[len(s)-1])-int(s[0]) {
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result = fmt.Sprintf("[%c-%c]", s[0], s[len(s)-1])
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// char or numeric set
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} else {
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result = "[" + s + "]"
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}
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// multiple edges of different lengths
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} else {
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result = "(?:" + strings.Join(sequences, "|") + ")"
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}
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if _, ok := trie['*']; ok {
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result += "?"
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}
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return result
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}
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return ""
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}
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return trieRegex(root, true)
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}
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func (pdb *PrometheusDataRepository) Init(rawConfig json.RawMessage) error {
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var config PrometheusDataRepositoryConfig
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// parse config
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if err := json.Unmarshal(rawConfig, &config); err != nil {
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log.Warn("Error while unmarshaling raw json config")
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return err
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}
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// support basic authentication
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var rt http.RoundTripper = nil
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if prom_pw := os.Getenv("PROMETHEUS_PASSWORD"); prom_pw != "" && config.Username != "" {
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prom_pw := promcfg.Secret(prom_pw)
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rt = promcfg.NewBasicAuthRoundTripper(config.Username, prom_pw, "", promapi.DefaultRoundTripper)
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} else {
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if config.Username != "" {
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return errors.New("METRICDATA/PROMETHEUS > Prometheus username provided, but PROMETHEUS_PASSWORD not set.")
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}
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}
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// init client
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client, err := promapi.NewClient(promapi.Config{
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Address: config.Url,
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RoundTripper: rt,
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})
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if err != nil {
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log.Error("Error while initializing new prometheus client")
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return err
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}
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// init query client
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pdb.client = client
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pdb.queryClient = promv1.NewAPI(pdb.client)
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// site config
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pdb.suffix = config.Suffix
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// init query templates
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pdb.templates = make(map[string]*template.Template)
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for metric, templ := range config.Templates {
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pdb.templates[metric], err = template.New(metric).Parse(templ)
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if err == nil {
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log.Debugf("Added PromQL template for %s: %s", metric, templ)
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} else {
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log.Warnf("Failed to parse PromQL template %s for metric %s", templ, metric)
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}
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}
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return nil
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}
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// TODO: respect scope argument
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func (pdb *PrometheusDataRepository) FormatQuery(
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metric string,
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scope schema.MetricScope,
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nodes []string,
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cluster string) (string, error) {
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args := PromQLArgs{}
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if len(nodes) > 0 {
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args.Nodes = fmt.Sprintf("(%s)%s", nodeRegex(nodes), pdb.suffix)
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} else {
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args.Nodes = fmt.Sprintf(".*%s", pdb.suffix)
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}
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buf := &bytes.Buffer{}
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if templ, ok := pdb.templates[metric]; ok {
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err := templ.Execute(buf, args)
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if err != nil {
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return "", errors.New(fmt.Sprintf("METRICDATA/PROMETHEUS > Error compiling template %v", templ))
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} else {
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query := buf.String()
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log.Debugf("PromQL: %s", query)
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return query, nil
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}
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} else {
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return "", errors.New(fmt.Sprintf("METRICDATA/PROMETHEUS > No PromQL for metric %s configured.", metric))
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}
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}
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// Convert PromAPI row to CC schema.Series
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func (pdb *PrometheusDataRepository) RowToSeries(
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from time.Time,
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step int64,
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steps int64,
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row *promm.SampleStream) schema.Series {
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ts := from.Unix()
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hostname := strings.TrimSuffix(string(row.Metric["exported_instance"]), pdb.suffix)
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// init array of expected length with NaN
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values := make([]schema.Float, steps+1)
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for i, _ := range values {
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values[i] = schema.NaN
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}
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// copy recorded values from prom sample pair
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for _, v := range row.Values {
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idx := (v.Timestamp.Unix() - ts) / step
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values[idx] = schema.Float(v.Value)
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}
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min, max, mean := MinMaxMean(values)
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// output struct
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return schema.Series{
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Hostname: hostname,
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Data: values,
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Statistics: schema.MetricStatistics{
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Avg: mean,
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Min: min,
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Max: max,
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},
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}
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}
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func (pdb *PrometheusDataRepository) LoadData(
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job *schema.Job,
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metrics []string,
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scopes []schema.MetricScope,
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ctx context.Context) (schema.JobData, error) {
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// TODO respect requested scope
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if len(scopes) == 0 || !contains(scopes, schema.MetricScopeNode) {
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scopes = append(scopes, schema.MetricScopeNode)
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}
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jobData := make(schema.JobData)
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// parse job specs
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nodes := make([]string, len(job.Resources))
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for i, resource := range job.Resources {
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nodes[i] = resource.Hostname
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}
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from := job.StartTime
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to := job.StartTime.Add(time.Duration(job.Duration) * time.Second)
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for _, scope := range scopes {
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if scope != schema.MetricScopeNode {
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logOnce.Do(func() {
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log.Infof("Scope '%s' requested, but not yet supported: Will return 'node' scope only.", scope)
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})
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continue
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}
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for _, metric := range metrics {
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metricConfig := archive.GetMetricConfig(job.Cluster, metric)
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if metricConfig == nil {
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log.Warnf("Error in LoadData: Metric %s for cluster %s not configured", metric, job.Cluster)
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return nil, errors.New("Prometheus config error")
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}
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query, err := pdb.FormatQuery(metric, scope, nodes, job.Cluster)
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if err != nil {
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log.Warn("Error while formatting prometheus query")
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return nil, err
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}
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// ranged query over all job nodes
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r := promv1.Range{
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Start: from,
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End: to,
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Step: time.Duration(metricConfig.Timestep * 1e9),
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}
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result, warnings, err := pdb.queryClient.QueryRange(ctx, query, r)
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if err != nil {
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log.Errorf("Prometheus query error in LoadData: %v\nQuery: %s", err, query)
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return nil, errors.New("Prometheus query error")
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}
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if len(warnings) > 0 {
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log.Warnf("Warnings: %v\n", warnings)
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}
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// init data structures
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if _, ok := jobData[metric]; !ok {
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jobData[metric] = make(map[schema.MetricScope]*schema.JobMetric)
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}
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jobMetric, ok := jobData[metric][scope]
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if !ok {
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jobMetric = &schema.JobMetric{
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Unit: metricConfig.Unit,
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Timestep: metricConfig.Timestep,
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Series: make([]schema.Series, 0),
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}
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jobData[metric][scope] = jobMetric
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}
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step := int64(metricConfig.Timestep)
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steps := int64(to.Sub(from).Seconds()) / step
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// iter rows of host, metric, values
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for _, row := range result.(promm.Matrix) {
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jobMetric.Series = append(jobMetric.Series,
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pdb.RowToSeries(from, step, steps, row))
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}
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// sort by hostname to get uniform coloring
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sort.Slice(jobMetric.Series, func(i, j int) bool {
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return (jobMetric.Series[i].Hostname < jobMetric.Series[j].Hostname)
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})
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}
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}
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return jobData, nil
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}
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// TODO change implementation to precomputed/cached stats
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func (pdb *PrometheusDataRepository) LoadStats(
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job *schema.Job,
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metrics []string,
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ctx context.Context) (map[string]map[string]schema.MetricStatistics, error) {
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// map of metrics of nodes of stats
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stats := map[string]map[string]schema.MetricStatistics{}
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data, err := pdb.LoadData(job, metrics, []schema.MetricScope{schema.MetricScopeNode}, ctx)
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if err != nil {
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log.Warn("Error while loading job for stats")
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return nil, err
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}
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for metric, metricData := range data {
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stats[metric] = make(map[string]schema.MetricStatistics)
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for _, series := range metricData[schema.MetricScopeNode].Series {
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stats[metric][series.Hostname] = series.Statistics
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}
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}
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return stats, nil
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}
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func (pdb *PrometheusDataRepository) LoadNodeData(
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cluster string,
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metrics, nodes []string,
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scopes []schema.MetricScope,
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from, to time.Time,
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ctx context.Context) (map[string]map[string][]*schema.JobMetric, error) {
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t0 := time.Now()
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// Map of hosts of metrics of value slices
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data := make(map[string]map[string][]*schema.JobMetric)
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// query db for each metric
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// TODO: scopes seems to be always empty
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if len(scopes) == 0 || !contains(scopes, schema.MetricScopeNode) {
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scopes = append(scopes, schema.MetricScopeNode)
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}
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for _, scope := range scopes {
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if scope != schema.MetricScopeNode {
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logOnce.Do(func() {
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log.Infof("Note: Scope '%s' requested, but not yet supported: Will return 'node' scope only.", scope)
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})
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continue
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}
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for _, metric := range metrics {
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metricConfig := archive.GetMetricConfig(cluster, metric)
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if metricConfig == nil {
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log.Warnf("Error in LoadNodeData: Metric %s for cluster %s not configured", metric, cluster)
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return nil, errors.New("Prometheus config error")
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}
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query, err := pdb.FormatQuery(metric, scope, nodes, cluster)
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if err != nil {
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log.Warn("Error while formatting prometheus query")
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return nil, err
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}
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// ranged query over all nodes
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r := promv1.Range{
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Start: from,
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End: to,
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Step: time.Duration(metricConfig.Timestep * 1e9),
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}
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result, warnings, err := pdb.queryClient.QueryRange(ctx, query, r)
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if err != nil {
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log.Errorf("Prometheus query error in LoadNodeData: %v\n", err)
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return nil, errors.New("Prometheus query error")
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}
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if len(warnings) > 0 {
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log.Warnf("Warnings: %v\n", warnings)
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}
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step := int64(metricConfig.Timestep)
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steps := int64(to.Sub(from).Seconds()) / step
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// iter rows of host, metric, values
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for _, row := range result.(promm.Matrix) {
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hostname := strings.TrimSuffix(string(row.Metric["exported_instance"]), pdb.suffix)
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hostdata, ok := data[hostname]
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if !ok {
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hostdata = make(map[string][]*schema.JobMetric)
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data[hostname] = hostdata
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}
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// output per host and metric
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hostdata[metric] = append(hostdata[metric], &schema.JobMetric{
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Unit: metricConfig.Unit,
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Timestep: metricConfig.Timestep,
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Series: []schema.Series{pdb.RowToSeries(from, step, steps, row)},
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},
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)
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}
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}
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}
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t1 := time.Since(t0)
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log.Debugf("LoadNodeData of %v nodes took %s", len(data), t1)
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return data, nil
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}
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