|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "github.com/go-kit/kit/log" |
| 6 | + "github.com/go-kit/kit/log/level" |
| 7 | + "github.com/prometheus/client_golang/prometheus" |
| 8 | + "github.com/prometheus/client_golang/prometheus/promhttp" |
| 9 | + "github.com/prometheus/common/promlog" |
| 10 | + "github.com/prometheus/common/promlog/flag" |
| 11 | + "github.com/prometheus/common/version" |
| 12 | + "github.com/tencentyun/tencentcloud-exporter/pkg/collector" |
| 13 | + "github.com/tencentyun/tencentcloud-exporter/pkg/config" |
| 14 | + kingpin "gopkg.in/alecthomas/kingpin.v2" |
| 15 | + "net/http" |
| 16 | + "os" |
| 17 | +) |
| 18 | + |
| 19 | +func newHandler(c *config.TencentConfig, includeExporterMetrics bool, maxRequests int, logger log.Logger) (*http.Handler, error) { |
| 20 | + exporterMetricsRegistry := prometheus.NewRegistry() |
| 21 | + if includeExporterMetrics { |
| 22 | + exporterMetricsRegistry.MustRegister( |
| 23 | + prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}), |
| 24 | + prometheus.NewGoCollector(), |
| 25 | + ) |
| 26 | + } |
| 27 | + |
| 28 | + nc, err := collector.NewTcMonitorCollector(c, logger) |
| 29 | + if err != nil { |
| 30 | + return nil, fmt.Errorf("couldn't create collector: %s", err) |
| 31 | + } |
| 32 | + r := prometheus.NewRegistry() |
| 33 | + r.MustRegister(version.NewCollector("qcloud_exporter")) |
| 34 | + if err := r.Register(nc); err != nil { |
| 35 | + return nil, fmt.Errorf("couldn't register tencent cloud monitor collector: %s", err) |
| 36 | + } |
| 37 | + |
| 38 | + handler := promhttp.HandlerFor( |
| 39 | + prometheus.Gatherers{exporterMetricsRegistry, r}, |
| 40 | + promhttp.HandlerOpts{ |
| 41 | + ErrorHandling: promhttp.ContinueOnError, |
| 42 | + MaxRequestsInFlight: maxRequests, |
| 43 | + Registry: exporterMetricsRegistry, |
| 44 | + }, |
| 45 | + ) |
| 46 | + if includeExporterMetrics { |
| 47 | + handler = promhttp.InstrumentMetricHandler( |
| 48 | + exporterMetricsRegistry, handler, |
| 49 | + ) |
| 50 | + } |
| 51 | + return &handler, nil |
| 52 | + |
| 53 | +} |
| 54 | + |
| 55 | +func main() { |
| 56 | + var ( |
| 57 | + listenAddress = kingpin.Flag( |
| 58 | + "web.listen-address", |
| 59 | + "Address on which to expose metrics and web interface.", |
| 60 | + ).Default(":9123").String() |
| 61 | + metricsPath = kingpin.Flag( |
| 62 | + "web.telemetry-path", |
| 63 | + "Path under which to expose metrics.", |
| 64 | + ).Default("/metrics").String() |
| 65 | + enableExporterMetrics = kingpin.Flag( |
| 66 | + "web.enable-exporter-metrics", |
| 67 | + "Include metrics about the exporter itself (promhttp_*, process_*, go_*).", |
| 68 | + ).Default("false").Bool() |
| 69 | + maxRequests = kingpin.Flag( |
| 70 | + "web.max-requests", |
| 71 | + "Maximum number of parallel scrape requests. Use 0 to disable.", |
| 72 | + ).Default("0").Int() |
| 73 | + configFile = kingpin.Flag( |
| 74 | + "config.file", "Tencent qcloud exporter configuration file.", |
| 75 | + ).Default("qcloud.yml").String() |
| 76 | + ) |
| 77 | + |
| 78 | + promlogConfig := &promlog.Config{} |
| 79 | + flag.AddFlags(kingpin.CommandLine, promlogConfig) |
| 80 | + kingpin.Version(version.Print("qcloud_exporter")) |
| 81 | + kingpin.HelpFlag.Short('h') |
| 82 | + kingpin.Parse() |
| 83 | + logger := promlog.New(promlogConfig) |
| 84 | + |
| 85 | + level.Info(logger).Log("msg", "Starting qcloud_exporter", "version", version.Info()) |
| 86 | + level.Info(logger).Log("msg", "Build context", "build_context", version.BuildContext()) |
| 87 | + |
| 88 | + tencentConfig := config.NewConfig() |
| 89 | + if err := tencentConfig.LoadFile(*configFile); err != nil { |
| 90 | + level.Error(logger).Log("msg", "Load config error", "err", err) |
| 91 | + os.Exit(1) |
| 92 | + } else { |
| 93 | + level.Info(logger).Log("msg", "Load config ok") |
| 94 | + } |
| 95 | + |
| 96 | + handler, err := newHandler(tencentConfig, *enableExporterMetrics, *maxRequests, logger) |
| 97 | + if err != nil { |
| 98 | + level.Error(logger).Log("msg", "Create handler fail", "err", err) |
| 99 | + os.Exit(1) |
| 100 | + } |
| 101 | + |
| 102 | + http.Handle(*metricsPath, *handler) |
| 103 | + http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { |
| 104 | + w.Write([]byte(`<html> |
| 105 | + <head><title>QCloud Exporter</title></head> |
| 106 | + <body> |
| 107 | + <h1>QCloud Exporter</h1> |
| 108 | + <p><a href="` + *metricsPath + `">Metrics</a></p> |
| 109 | + </body> |
| 110 | + </html>`)) |
| 111 | + }) |
| 112 | + |
| 113 | + level.Info(logger).Log("msg", "Listening on", "address", *listenAddress) |
| 114 | + err = http.ListenAndServe(*listenAddress, nil) |
| 115 | + if err != nil { |
| 116 | + level.Error(logger).Log("err", err) |
| 117 | + os.Exit(1) |
| 118 | + } |
| 119 | +} |
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