You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
2.2 KiB
88 lines
2.2 KiB
package altsrc_test
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"os"
|
|
"time"
|
|
|
|
"github.com/urfave/cli/v3"
|
|
"github.com/urfave/cli/v3/altsrc"
|
|
)
|
|
|
|
func ExampleApp_Run_yamlFileLoaderDuration() {
|
|
execServe := func(c *cli.Context) error {
|
|
keepaliveInterval := c.Duration("keepalive-interval")
|
|
fmt.Printf("keepalive %s\n", keepaliveInterval)
|
|
return nil
|
|
}
|
|
|
|
fileExists := func(filename string) bool {
|
|
stat, _ := os.Stat(filename)
|
|
return stat != 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.
|
|
initConfigFileInputSource := func(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)
|
|
}
|
|
}
|
|
|
|
flagsServe := []cli.Flag{
|
|
&cli.StringFlag{
|
|
Name: "config",
|
|
Aliases: []string{"c"},
|
|
EnvVars: []string{"CONFIG_FILE"},
|
|
Value: "../testdata/empty.yml",
|
|
DefaultText: "../testdata/empty.yml",
|
|
Usage: "config file",
|
|
},
|
|
altsrc.NewDurationFlag(
|
|
&cli.DurationFlag{
|
|
Name: "keepalive-interval",
|
|
Aliases: []string{"k"},
|
|
EnvVars: []string{"KEEPALIVE_INTERVAL"},
|
|
Value: 45 * time.Second,
|
|
Usage: "interval of keepalive messages",
|
|
},
|
|
),
|
|
}
|
|
|
|
cmdServe := &cli.Command{
|
|
Name: "serve",
|
|
Usage: "Run the server",
|
|
UsageText: "serve [OPTIONS..]",
|
|
Action: execServe,
|
|
Flags: flagsServe,
|
|
Before: initConfigFileInputSource("config", flagsServe),
|
|
}
|
|
|
|
c := &cli.App{
|
|
Name: "cmd",
|
|
HideVersion: true,
|
|
UseShortOptionHandling: true,
|
|
Commands: []*cli.Command{
|
|
cmdServe,
|
|
},
|
|
}
|
|
|
|
if err := c.Run([]string{"cmd", "serve", "--config", "../testdata/empty.yml"}); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// Output:
|
|
// keepalive 45s
|
|
}
|