Initial QSfera import

Server/pkg/config/helpers.go

@@ -0,0 +1,69 @@
+package config
+
+import (
+	"io/fs"
+	"os"
+	"path"
+	"strings"
+
+	gofig "github.com/gookit/config/v2"
+	gooyaml "github.com/gookit/config/v2/yaml"
+	"github.com/qsfera/server/pkg/config/defaults"
+)
+
+var (
+	// decoderConfigTagName sets the tag name to be used from the config structs
+	// currently we only support "yaml" because we only support config loading
+	// from yaml files and the yaml parser has no simple way to set a custom tag name to use
+	decoderConfigTagName = "yaml"
+)
+
+// BindSourcesToStructs assigns any config value from a config file / env variable to struct `dst`.
+func BindSourcesToStructs(service string, dst any) error {
+	fileSystem := os.DirFS("/")
+	filePath := strings.TrimLeft(path.Join(defaults.BaseConfigPath(), service+".yaml"), "/")
+	return bindSourcesToStructs(fileSystem, filePath, service, dst)
+}
+
+func bindSourcesToStructs(fileSystem fs.FS, filePath, service string, dst any) error {
+	cnf := gofig.NewWithOptions(service)
+	cnf.WithOptions(func(options *gofig.Options) {
+		options.ParseEnv = true
+		options.DecoderConfig.TagName = decoderConfigTagName
+	})
+	cnf.AddDriver(gooyaml.Driver)
+
+	yamlContent, err := fs.ReadFile(fileSystem, filePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+
+		return err
+	}
+	_ = cnf.LoadSources("yaml", yamlContent)
+
+	err = cnf.BindStruct("", &dst)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// LocalEndpoint returns the local endpoint for a given protocol and address.
+// Use it when configuring the reva runtime to get a service endpoint in the same
+// runtime, e.g. a gateway talking to an authregistry service.
+func LocalEndpoint(protocol, addr string) string {
+	localEndpoint := addr
+	switch protocol {
+	case "tcp":
+		parts := strings.SplitN(addr, ":", 2)
+		if len(parts) == 2 {
+			localEndpoint = "dns:127.0.0.1:" + parts[1]
+		}
+	case "unix":
+		localEndpoint = "unix:" + addr
+	}
+	return localEndpoint
+}