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exporter.go
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exporter.go
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package main
import (
"context"
"fmt"
"io"
"sync"
"time"
"github.com/p4gefau1t/trojan-go/api/service"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"google.golang.org/grpc"
)
// Exporter struct
type Exporter struct {
sync.Mutex
endpoint string
scrapeTimeout time.Duration
registry *prometheus.Registry
totalScrapes prometheus.Counter
metricDescriptions map[string]*prometheus.Desc
}
// NewExporter to create exporter
func NewExporter(endpoint string, scrapeTimeout time.Duration) *Exporter {
e := Exporter{
endpoint: endpoint,
scrapeTimeout: scrapeTimeout,
registry: prometheus.NewRegistry(),
totalScrapes: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "trojan_go",
Name: "scrapes_total",
Help: "Total number of scrapes performed",
}),
}
e.metricDescriptions = map[string]*prometheus.Desc{}
for k, desc := range map[string]struct {
txt string
lbls []string
}{
"scrape_duration_seconds": {txt: "Scrape duration in seconds"},
"upload_traffic_bytes_total": {txt: "Number of transmitted bytes", lbls: []string{"target"}},
"download_traffic_bytes_total": {txt: "Number of receieved bytes", lbls: []string{"target"}},
"current_upload_speed": {txt: "Number of current upload speed bytes", lbls: []string{"target"}},
"current_download_speed": {txt: "Number of current download speed bytes", lbls: []string{"target"}},
} {
e.metricDescriptions[k] = e.newMetricDescr(k, desc.txt, desc.lbls)
}
e.registry.MustRegister(&e)
return &e
}
// Collect metrics
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
e.Lock()
defer e.Unlock()
e.totalScrapes.Inc()
if err := e.scrapeTrojanGo(ch); err != nil {
log.Warnf("Scrape failed! %s", err)
}
ch <- e.totalScrapes
}
// Describe implement
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
for _, desc := range e.metricDescriptions {
ch <- desc
}
ch <- e.totalScrapes.Desc()
}
// scrape TrojanGo metrics
func (e *Exporter) scrapeTrojanGo(ch chan<- prometheus.Metric) error {
ctx, cancel := context.WithTimeout(context.Background(), e.scrapeTimeout)
defer cancel()
conn, err := grpc.DialContext(ctx, e.endpoint, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
return fmt.Errorf("failed to dial: %w, timeout: %v", err, e.scrapeTimeout)
}
defer conn.Close()
client := service.NewTrojanServerServiceClient(conn)
if err := e.scrapeTrojanGoMetrics(ctx, ch, client); err != nil {
return err
}
return nil
}
// scrape TrojanGo Metrics
func (e *Exporter) scrapeTrojanGoMetrics(ctx context.Context, ch chan<- prometheus.Metric, client service.TrojanServerServiceClient) error {
stream, _ := client.ListUsers(ctx, &service.ListUsersRequest{})
result := []*service.ListUsersResponse{}
for {
resp, err := stream.Recv()
if err != nil {
if err == io.EOF {
break
}
}
result = append(result, resp)
}
for _, resp := range result {
userHash := resp.Status.User.Hash
uploadTraffic := resp.Status.TrafficTotal.UploadTraffic
e.registerConstMetricGauge(ch, "upload_traffic_bytes_total", float64(uploadTraffic), userHash)
downloadTraffic := resp.Status.TrafficTotal.DownloadTraffic
e.registerConstMetricGauge(ch, "download_traffic_bytes_total", float64(downloadTraffic), userHash)
speedCureent := resp.Status.SpeedCurrent
if speedCureent != nil {
uploadSpeed := speedCureent.UploadSpeed
e.registerConstMetricGauge(ch, "current_upload_speed", float64(uploadSpeed), userHash)
downloadSpeed := speedCureent.DownloadSpeed
e.registerConstMetricGauge(ch, "current_download_speed", float64(downloadSpeed), userHash)
} else {
e.registerConstMetricGauge(ch, "current_upload_speed", 0, userHash)
e.registerConstMetricGauge(ch, "current_download_speed", 0, userHash)
}
}
return nil
}
// register Const Metric Gauge
func (e *Exporter) registerConstMetricGauge(ch chan<- prometheus.Metric, metric string, val float64, labels ...string) {
e.registerConstMetric(ch, metric, val, prometheus.GaugeValue, labels...)
}
// register Const Metric
func (e *Exporter) registerConstMetric(ch chan<- prometheus.Metric, metric string, val float64, valType prometheus.ValueType, labelValues ...string) {
descr := e.metricDescriptions[metric]
if descr == nil {
descr = e.newMetricDescr(metric, metric+" metric", nil)
}
if m, err := prometheus.NewConstMetric(descr, valType, val, labelValues...); err == nil {
ch <- m
} else {
log.Debugf("NewConstMetric() err: %s", err)
}
}
func (e *Exporter) newMetricDescr(metricName string, docString string, labels []string) *prometheus.Desc {
return prometheus.NewDesc(prometheus.BuildFQName("trojan_go", "", metricName), docString, labels, nil)
}