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main.go
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main.go
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package harness
import (
"github.com/urfave/cli"
"os"
)
var (
defaultOpts = []cli.Flag{
cli.IntFlag{
Name: "port",
Usage: "The port number used to expose metrics via http",
Value: 7979,
},
cli.StringFlag{
Name: "log-level",
Usage: "Set Logging level",
Value: "info",
},
}
defaultTickOpt = cli.IntFlag{
Name: "interval",
Usage: "Interval to fetch metrics from the endpoint in second",
Value: 60,
}
)
func MakeApp(opts *ExporterOpts) *cli.App {
exp := &exporter{opts}
app := cli.NewApp()
app.Name = opts.Name
app.Version = opts.Version
app.Usage = "A prometheus " + opts.Name
app.UsageText = opts.Usage
app.Action = exp.main
app.Flags = buildOptsWithDefault(opts.Flags, defaultOpts)
if opts.Tick && !contains(app.Flags, defaultTickOpt) {
app.Flags = append(app.Flags, defaultTickOpt)
}
return app
}
func buildOptsWithDefault(opts []cli.Flag, defaultOpts []cli.Flag) []cli.Flag {
for _, opt := range defaultOpts {
if !contains(opts, opt) {
opts = append(opts, opt)
}
}
return opts
}
func contains(opts []cli.Flag, opt cli.Flag) bool {
for _, o := range opts {
if o.GetName() == opt.GetName() {
return true
}
}
return false
}
func Main(opts *ExporterOpts) {
err := MakeApp(opts).Run(os.Args)
if err != nil {
os.Exit(1)
}
}