move config parsing in separate package for each service

ocis/pkg/command/root.go

@@ -1,13 +1,11 @@
 package command
 
 import (
-	"errors"
 	"os"
 
 	"github.com/owncloud/ocis/ocis-pkg/clihelper"
 	"github.com/owncloud/ocis/ocis-pkg/config"
-	"github.com/owncloud/ocis/ocis-pkg/config/envdecode"
-	"github.com/owncloud/ocis/ocis-pkg/shared"
+	"github.com/owncloud/ocis/ocis-pkg/config/parser"
 	"github.com/owncloud/ocis/ocis/pkg/register"
 	"github.com/urfave/cli/v2"
 )
@@ -19,11 +17,8 @@ func Execute() error {
 	app := clihelper.DefaultApp(&cli.App{
 		Name:  "ocis",
 		Usage: "ownCloud Infinite Scale Stack",
-
 		Before: func(c *cli.Context) error {
-			// TODO: what do do?
-			//cfg.Service.Version = version.String
-			return ParseConfig(c, cfg)
+			return parser.ParseConfig(cfg)
 		},
 	})
 
@@ -41,33 +36,3 @@ func Execute() error {
 
 	return app.Run(os.Args)
 }
-
-// ParseConfig loads ocis configuration.
-func ParseConfig(c *cli.Context, cfg *config.Config) error {
-	_, err := config.BindSourcesToStructs("ocis", cfg)
-	if err != nil {
-		return err
-	}
-
-	// provide with defaults for shared logging, since we need a valid destination address for BindEnv.
-	if cfg.Log == nil && cfg.Commons != nil && cfg.Commons.Log != nil {
-		cfg.Log = &shared.Log{
-			Level:  cfg.Commons.Log.Level,
-			Pretty: cfg.Commons.Log.Pretty,
-			Color:  cfg.Commons.Log.Color,
-			File:   cfg.Commons.Log.File,
-		}
-	} else if cfg.Log == nil && cfg.Commons == nil {
-		cfg.Log = &shared.Log{}
-	}
-
-	// load all env variables relevant to the config in the current context.
-	if err := envdecode.Decode(cfg); err != nil {
-		// no environment variable set for this config is an expected "error"
-		if !errors.Is(err, envdecode.ErrNoTargetFieldsAreSet) {
-			return err
-		}
-	}
-
-	return nil
-}