main.go

package main

import (
	"fmt"
	"log"
	"os"

	corev2 "github.com/sensu/sensu-go/api/core/v2"
	"github.com/sensu/sensu-plugin-sdk/sensu"
)

// Config represents the check plugin config.
type Config struct {
	sensu.PluginConfig
	Example string
}

var (
	plugin = Config{
		PluginConfig: sensu.PluginConfig{
			Name:     "{{ .GithubProject }}",
			Short:    "{{ .Description }}",
			Keyspace: "sensu.io/plugins/{{ .GithubProject }}/config",
		},
	}

	options = []sensu.ConfigOption{
		&sensu.PluginConfigOption[string]{
			Path:      "example",
			Env:       "CHECK_EXAMPLE",
			Argument:  "example",
			Shorthand: "e",
			Default:   "",
			Usage:     "An example string configuration option",
			Value:     &plugin.Example,
		},
	}
)

func main() {
	useStdin := false
	fi, err := os.Stdin.Stat()
	if err != nil {
		fmt.Printf("Error check stdin: %v\n", err)
		panic(err)
	}
	//Check the Mode bitmask for Named Pipe to indicate stdin is connected
	if fi.Mode()&os.ModeNamedPipe != 0 {
		log.Println("using stdin")
		useStdin = true
	}

	check := sensu.NewGoCheck(&plugin.PluginConfig, options, checkArgs, executeCheck, useStdin)
	check.Execute()
}

func checkArgs(event *corev2.Event) (int, error) {
	if len(plugin.Example) == 0 {
		return sensu.CheckStateWarning, fmt.Errorf("--example or CHECK_EXAMPLE environment variable is required")
	}
	return sensu.CheckStateOK, nil
}

func executeCheck(event *corev2.Event) (int, error) {
	log.Println("executing check with --example", plugin.Example)
	return sensu.CheckStateOK, nil
}