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prometheus_manager.go
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/
prometheus_manager.go
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package monitor
import (
"context"
"fmt"
"net/http"
"regexp"
"strings"
"sync"
"time"
promapi "github.com/prometheus/client_golang/api"
promapiv1 "github.com/prometheus/client_golang/api/prometheus/v1"
"github.com/prometheus/common/model"
"github.com/rancher/types/config/dialer"
"golang.org/x/sync/errgroup"
)
var (
legendFormat = regexp.MustCompile(`\[\[\s*(.+?)\s*\]\]`)
)
type Queries struct {
ctx context.Context
api promapiv1.API
eg *errgroup.Group
}
func NewPrometheusQuery(ctx context.Context, clusterName, authToken, svcNamespace, svcName, svcPort string, dialerFactory dialer.Factory) (*Queries, error) {
dial, err := dialerFactory.ClusterDialer(clusterName)
if err != nil {
return nil, fmt.Errorf("get dail from usercontext failed, %v", err)
}
endpoint := fmt.Sprintf("http://%s.%s:%s", svcName, svcNamespace, svcPort)
api, err := newPrometheusAPI(dial, endpoint, authToken)
if err != nil {
return nil, err
}
return newQuery(ctx, api), nil
}
func (q *Queries) QueryRange(query *PrometheusQuery) ([]*TimeSeries, error) {
value, err := q.api.QueryRange(q.ctx, query.Expr, query.getRange())
if err != nil {
return nil, fmt.Errorf("query range failed, %v, expression: %s", err, query.Expr)
}
seriesSlice, err := parseMatrix(value, query)
if err != nil {
return nil, fmt.Errorf("parse prometheus query result failed, %v", err)
}
return seriesSlice, nil
}
func (q *Queries) Query(query *PrometheusQuery) ([]*TimeSeries, error) {
value, err := q.api.Query(q.ctx, query.Expr, time.Now())
if err != nil {
return nil, fmt.Errorf("query range failed, %v, expression: %s", err, query.Expr)
}
series, err := parseVector(value, query)
if err != nil {
return nil, fmt.Errorf("parse prometheus query result failed, %v", err)
}
if series == nil {
return nil, nil
}
return []*TimeSeries{series}, nil
}
func (q *Queries) Do(querys []*PrometheusQuery) (map[string][]*TimeSeries, error) {
smap := &sync.Map{}
for _, v := range querys {
query := v
q.eg.Go(func() error {
var seriesSlice []*TimeSeries
var err error
if query.IsInstanceQuery {
seriesSlice, err = q.Query(query)
} else {
seriesSlice, err = q.QueryRange(query)
}
if err != nil {
return err
}
if seriesSlice != nil {
smap.Store(query.ID, seriesSlice)
}
return nil
})
}
if err := q.eg.Wait(); err != nil {
return nil, err
}
rtn := make(map[string][]*TimeSeries)
smap.Range(func(k, v interface{}) bool {
key1, key2, _ := parseID(k.(string))
key := fmt.Sprintf("%s_%s", key1, key2)
series := v.([]*TimeSeries)
if len(series) != 0 {
rtn[key] = append(rtn[key], series...)
}
return true
})
return rtn, nil
}
func (q *Queries) GetLabelValues(labelName string) ([]string, error) {
value, err := q.api.LabelValues(q.ctx, labelName)
if err != nil {
return nil, fmt.Errorf("get prometheus metric list failed, %v", err)
}
var metricNames []string
for _, v := range value {
metricNames = append(metricNames, fmt.Sprint(v))
}
return metricNames, nil
}
func InitPromQuery(id string, start, end time.Time, step time.Duration, expr, format string, isInstanceQuery bool) *PrometheusQuery {
return &PrometheusQuery{
ID: id,
Start: start,
End: end,
Step: step,
Expr: expr,
LegendFormat: format,
IsInstanceQuery: isInstanceQuery,
}
}
func newQuery(ctx context.Context, api promapiv1.API) *Queries {
q := &Queries{
ctx: ctx,
api: api,
}
q.eg, q.ctx = errgroup.WithContext(q.ctx)
return q
}
type authTransport struct {
*http.Transport
token string
}
func (auth authTransport) RoundTrip(req *http.Request) (*http.Response, error) {
req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", auth.token))
return auth.Transport.RoundTrip(req)
}
func newHTTPTransport(dial dialer.Dialer) *http.Transport {
return &http.Transport{
Dial: dial,
ExpectContinueTimeout: 1 * time.Second,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
}
}
func newPrometheusAPI(dial dialer.Dialer, url, token string) (promapiv1.API, error) {
auth := authTransport{
Transport: newHTTPTransport(dial),
token: token,
}
cfg := promapi.Config{
Address: url,
RoundTripper: auth,
}
client, err := promapi.NewClient(cfg)
if err != nil {
return nil, fmt.Errorf("create prometheus client failed: %v", err)
}
return promapiv1.NewAPI(client), nil
}
func parseVector(value model.Value, query *PrometheusQuery) (*TimeSeries, error) {
data, ok := value.(model.Vector)
if !ok {
return nil, fmt.Errorf("Unsupported result format: %s", value.Type().String())
}
if data.Len() == 0 {
return nil, nil
}
vec := data[0]
series := TimeSeries{
Name: formatLegend(vec.Metric, query),
Tags: map[string]string{},
}
for k, v := range vec.Metric {
series.Tags[string(k)] = string(v)
}
po, isValid := NewTimePoint(float64(vec.Value), float64(vec.Timestamp.Unix()*1000))
if isValid {
series.Points = append(series.Points, po)
return &series, nil
}
return nil, nil
}
func parseMatrix(value model.Value, query *PrometheusQuery) ([]*TimeSeries, error) {
data, ok := value.(model.Matrix)
if !ok {
return nil, fmt.Errorf("Unsupported result format: %s", value.Type().String())
}
if data.Len() == 0 {
return nil, nil
}
var seriesSlice []*TimeSeries
for _, v := range data {
series := TimeSeries{
Name: formatLegend(v.Metric, query),
Tags: map[string]string{},
}
for k, v := range v.Metric {
series.Tags[string(k)] = string(v)
}
for _, v := range v.Values {
po, isValid := NewTimePoint(float64(v.Value), float64(v.Timestamp.Unix()*1000))
if isValid {
series.Points = append(series.Points, po)
}
}
seriesSlice = append(seriesSlice, &series)
}
return seriesSlice, nil
}
func formatLegend(metric model.Metric, query *PrometheusQuery) string {
if query.LegendFormat == "" {
return metric.String()
}
result := legendFormat.ReplaceAllFunc([]byte(query.LegendFormat), func(in []byte) []byte {
labelName := strings.Replace(string(in), "[[", "", 1)
labelName = strings.Replace(labelName, "]]", "", 1)
labelName = strings.TrimSpace(labelName)
if val, exists := metric[model.LabelName(labelName)]; exists {
return []byte(val)
}
return in
})
return string(result)
}