ntfy/cmd/app.go

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// Package cmd provides the ntfy CLI application
package cmd
import (
"fmt"
"github.com/urfave/cli/v2"
"github.com/urfave/cli/v2/altsrc"
"heckel.io/ntfy/config"
"heckel.io/ntfy/server"
"log"
"os"
)
// New creates a new CLI application
func New() *cli.App {
flags := []cli.Flag{
&cli.StringFlag{Name: "config", Aliases: []string{"c"}, EnvVars: []string{"NTFY_CONFIG_FILE"}, Value: "/etc/ntfy/config.yml", DefaultText: "/etc/ntfy/config.yml", Usage: "config file"},
altsrc.NewStringFlag(&cli.StringFlag{Name: "listen-http", Aliases: []string{"l"}, EnvVars: []string{"NTFY_LISTEN_HTTP"}, Value: config.DefaultListenHTTP, Usage: "ip:port used to as listen address"}),
altsrc.NewDurationFlag(&cli.DurationFlag{Name: "keepalive-interval", Aliases: []string{"k"}, EnvVars: []string{"NTFY_KEEPALIVE_INTERVAL"}, Value: config.DefaultKeepaliveInterval, Usage: "default interval of keepalive messages"}),
}
return &cli.App{
Name: "ntfy",
Usage: "Simple pub-sub notification service",
UsageText: "ntfy [OPTION..]",
HideHelp: true,
HideVersion: true,
EnableBashCompletion: true,
UseShortOptionHandling: true,
Reader: os.Stdin,
Writer: os.Stdout,
ErrWriter: os.Stderr,
Action: execRun,
Before: initConfigFileInputSource("config", flags),
Flags: flags,
}
}
func execRun(c *cli.Context) error {
// Read all the options
listenHTTP := c.String("listen-http")
keepaliveInterval := c.Duration("keepalive-interval")
// Run main bot, can be killed by signal
conf := config.New(listenHTTP)
conf.KeepaliveInterval = keepaliveInterval
s := server.New(conf)
if err := s.Run(); err != nil {
log.Fatalln(err)
}
log.Printf("Exiting.")
return nil
}
// initConfigFileInputSource is like altsrc.InitInputSourceWithContext and altsrc.NewYamlSourceFromFlagFunc, but checks
// if the config flag is exists and only loads it if it does. If the flag is set and the file exists, it fails.
func initConfigFileInputSource(configFlag string, flags []cli.Flag) cli.BeforeFunc {
return func(context *cli.Context) error {
configFile := context.String(configFlag)
if context.IsSet(configFlag) && !fileExists(configFile) {
return fmt.Errorf("config file %s does not exist", configFile)
} else if !context.IsSet(configFlag) && !fileExists(configFile) {
return nil
}
inputSource, err := altsrc.NewYamlSourceFromFile(configFile)
if err != nil {
return err
}
return altsrc.ApplyInputSourceValues(context, inputSource, flags)
}
}
func fileExists(filename string) bool {
stat, _ := os.Stat(filename)
return stat != nil
}