doggo/cmd/api/config.go

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2021-02-27 09:31:59 +01:00
package main
import (
"fmt"
"os"
"strings"
"github.com/knadh/koanf/parsers/toml"
"github.com/knadh/koanf/providers/env"
"github.com/knadh/koanf/providers/file"
"github.com/knadh/koanf/providers/posflag"
"github.com/sirupsen/logrus"
flag "github.com/spf13/pflag"
)
// Config is the config given by the user
type Config struct {
HTTPAddr string `koanf:"listen_addr"`
}
func initConfig() {
f := flag.NewFlagSet("api", flag.ContinueOnError)
f.Usage = func() {
fmt.Println(f.FlagUsages())
os.Exit(0)
}
// Register --config flag.
f.StringSlice("config", []string{"config.toml"},
"Path to one or more TOML config files to load in order")
// Register --version flag.
f.Bool("version", false, "Show build version")
f.Parse(os.Args[1:])
// Display version.
if ok, _ := f.GetBool("version"); ok {
fmt.Println(buildVersion, buildDate)
os.Exit(0)
}
// Read the config files.
cFiles, _ := f.GetStringSlice("config")
for _, f := range cFiles {
logger.WithFields(logrus.Fields{
"file": f,
}).Info("reading config")
if err := ko.Load(file.Provider(f), toml.Parser()); err != nil {
logger.Fatalf("error reading config: %v", err)
}
}
// Load environment variables and merge into the loaded config.
if err := ko.Load(env.Provider("DOGGO_API_", ".", func(s string) string {
return strings.Replace(strings.ToLower(
strings.TrimPrefix(s, "DOGGO_API_")), "__", ".", -1)
}), nil); err != nil {
logger.Fatalf("error loading env config: %v", err)
}
ko.Load(posflag.Provider(f, ".", ko), nil)
}