88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
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package altsrc_test
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import (
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"fmt"
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"log"
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"os"
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"time"
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"github.com/urfave/cli/v2"
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"github.com/urfave/cli/v2/altsrc"
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)
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func ExampleApp_Run_yamlFileLoaderDuration() {
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execServe := func(c *cli.Context) error {
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keepaliveInterval := c.Duration("keepalive-interval")
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fmt.Printf("keepalive %s\n", keepaliveInterval)
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return nil
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}
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fileExists := func(filename string) bool {
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stat, _ := os.Stat(filename)
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return stat != nil
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}
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// initConfigFileInputSource is like altsrc.InitInputSourceWithContext and altsrc.NewYamlSourceFromFlagFunc, but checks
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// if the config flag is exists and only loads it if it does. If the flag is set and the file exists, it fails.
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initConfigFileInputSource := func(configFlag string, flags []cli.Flag) cli.BeforeFunc {
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return func(context *cli.Context) error {
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configFile := context.String(configFlag)
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if context.IsSet(configFlag) && !fileExists(configFile) {
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return fmt.Errorf("config file %s does not exist", configFile)
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} else if !context.IsSet(configFlag) && !fileExists(configFile) {
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return nil
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}
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inputSource, err := altsrc.NewYamlSourceFromFile(configFile)
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if err != nil {
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return err
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}
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return altsrc.ApplyInputSourceValues(context, inputSource, flags)
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}
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}
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flagsServe := []cli.Flag{
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&cli.StringFlag{
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Name: "config",
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Aliases: []string{"c"},
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EnvVars: []string{"CONFIG_FILE"},
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Value: "../testdata/empty.yml",
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DefaultText: "../testdata/empty.yml",
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Usage: "config file",
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},
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altsrc.NewDurationFlag(
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&cli.DurationFlag{
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Name: "keepalive-interval",
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Aliases: []string{"k"},
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EnvVars: []string{"KEEPALIVE_INTERVAL"},
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Value: 45 * time.Second,
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Usage: "interval of keepalive messages",
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},
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),
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}
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cmdServe := &cli.Command{
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Name: "serve",
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Usage: "Run the server",
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UsageText: "serve [OPTIONS..]",
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Action: execServe,
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Flags: flagsServe,
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Before: initConfigFileInputSource("config", flagsServe),
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}
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c := &cli.App{
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Name: "cmd",
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HideVersion: true,
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UseShortOptionHandling: true,
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Commands: []*cli.Command{
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cmdServe,
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},
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}
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if err := c.Run([]string{"cmd", "serve", "--config", "../testdata/empty.yml"}); err != nil {
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log.Fatal(err)
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}
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// Output:
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// keepalive 45s
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}
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