Added webserver tests

config/configfiles.go

@@ -0,0 +1,87 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/user"
+	"path/filepath"
+	"reflect"
+
+	"github.com/creasty/defaults"
+	"gopkg.in/yaml.v3"
+	"scm.yoorie.de/go-lib/util"
+)
+
+func GetConfigurationFiles(appName string) []string {
+	// First checking local config
+	executablePath, _ := os.Executable()
+	fname := filepath.Base(executablePath)
+	fext := filepath.Ext(executablePath)
+	fdir := filepath.Dir(executablePath)
+	fnameWoExt := fname[0 : len(fname)-len(fext)]
+	ymlExts := [2]string{".yml", ".yaml"}
+	fileNames := make([]string, 0, 4)
+	for _, ext := range ymlExts {
+		fileNames = append(fileNames, filepath.Join(fdir, fnameWoExt+ext))
+	}
+	usr, _ := user.Current()
+	fileNames = append(fileNames, filepath.Join(usr.HomeDir, "."+appName, "config"))
+	// Check for global config
+	fileNames = append(fileNames, util.GetGlobalConfigurationFile(appName, "config"))
+	return fileNames
+}
+
+func GetConfigurationFile(appName string) string {
+	// First checking local config
+	files := GetConfigurationFiles(appName)
+	for _, localConfigFile := range files {
+		if util.FileExists(localConfigFile) {
+			return localConfigFile
+		}
+	}
+	return ""
+}
+
+func LoadConfiguration[T any](config T) error {
+	return LoadConfigurationFromFile(config, "")
+}
+
+func IsStructPointer[T any](config T) bool {
+	value := reflect.ValueOf(config)
+	return value.Type().Kind() == reflect.Pointer && reflect.Indirect(value).Type().Kind() == reflect.Struct
+}
+
+func LoadConfigurationFromFile[T any](config T, configFile string) error {
+	if !IsStructPointer(config) {
+		genericType := reflect.TypeOf(config)
+		return errors.New(fmt.Sprintf("Type: %s.%s is not a struct pointer", genericType.PkgPath(), genericType.Name()))
+	}
+	defaults.Set(config)
+	if configFile != "" {
+		if !util.FileExists(configFile) {
+			return errors.New(fmt.Sprintf("given configuration file %s cannot be found", configFile))
+		}
+	} else {
+		if method := reflect.ValueOf(config).MethodByName("appName"); !method.IsNil() {
+			result := method.String()
+			if result != "" {
+				configFile = GetConfigurationFile(result)
+			}
+		}
+	}
+
+	if configFile == "" {
+		return nil
+	}
+	ymldata, err := ioutil.ReadFile(configFile)
+	if err != nil {
+		return errors.New(fmt.Sprintf("cannot read configuration file %s. %v", configFile, err))
+	}
+	err = yaml.Unmarshal(ymldata, config)
+	if err != nil {
+		return errors.New(fmt.Sprintf("error unmarshalling configuration data: %v", err))
+	}
+	return nil
+}