Improve config and startup handling

- use `Unmarshal` method of viper
- move config loading, defaulting and stuff to config package
- move serve to an extra command and move keep only global flags in root command
- add startup logic to onInit method in root command
- update mocks
- clean config structs
- adopt changes in plugins
- update default config

Makefile

@@ -2,7 +2,8 @@ VERSION = $(shell git describe --dirty --tags --always)
 DIR = $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
 BUILD_PATH = $(DIR)/main.go
 PKGS = $(shell go list ./...)
-TEST_PKGS = $(shell find . -type f -name "*_test.go" -not -path "./plugins/*" -not -path "*/mock/*" -printf '%h\n' | sort -u)
+TEST_PKGS = $(shell go list ./...)
+PROTO_FILES = $(shell find $(DIR)api/ -type f -name "*.proto")
 GOARGS = GOOS=linux GOARCH=amd64
 GO_BUILD_ARGS = -ldflags="-w -s"
 GO_CONTAINER_BUILD_ARGS = -ldflags="-w -s" -a -installsuffix cgo
@@ -14,7 +15,7 @@ DEBUG_ARGS?= --development-logs=true
 CONTAINER_BUILDER ?= podman
 DOCKER_IMAGE ?= inetmock
 
-.PHONY: clean all format deps update-deps compile debug generate snapshot-release test cli-cover-report html-cover-report plugins $(PLUGINS) $(GO_GEN_FILES)
+.PHONY: clean all format deps update-deps compile debug generate protoc snapshot-release test cli-cover-report html-cover-report plugins $(PLUGINS) $(GO_GEN_FILES)
 all: clean format compile test plugins
 
 clean:
@@ -55,6 +56,9 @@ debug:
 generate:
 	@go generate ./...
 
+protoc:
+	@protoc --proto_path $(DIR)api/ --go_out=plugins=grpc:internal/grpc --go_opt=paths=source_relative $(shell find $(DIR)api/ -type f -name "*.proto")
+
 snapshot-release:
 	@goreleaser release --snapshot --skip-publish --rm-dist
 

internal/cmd/ca.go

@@ -4,6 +4,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"github.com/baez90/inetmock/pkg/cert"
+	config2 "github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
 	"github.com/spf13/cobra"
 	"go.uber.org/zap"
@@ -77,11 +78,11 @@ func runGenerateCA(cmd *cobra.Command, args []string) {
 		zap.String(generateCACertOutPath, certOutPath),
 	)
 
-	generator := cert.NewDefaultGenerator(cert.Options{
+	generator := cert.NewDefaultGenerator(config2.CertOptions{
 		CertCachePath: certOutPath,
-		Curve:         cert.CurveType(curveName),
+		Curve:         config2.CurveType(curveName),
-		Validity: cert.ValidityByPurpose{
+		Validity: config2.ValidityByPurpose{
-			CA: cert.ValidityDuration{
+			CA: config2.ValidityDuration{
 				NotAfterRelative:  notAfter,
 				NotBeforeRelative: notBefore,
 			},

internal/cmd/init.go

@@ -1,70 +0,0 @@
-package cmd
-
-import (
-	"github.com/baez90/inetmock/internal/endpoints"
-	"github.com/baez90/inetmock/internal/plugins"
-	"github.com/baez90/inetmock/pkg/api"
-	"github.com/baez90/inetmock/pkg/logging"
-	"github.com/baez90/inetmock/pkg/path"
-	"github.com/spf13/viper"
-	"go.uber.org/zap"
-	"os"
-	"time"
-)
-
-var (
-	appIsInitialized = false
-)
-
-func initApp() (err error) {
-	if appIsInitialized {
-		return
-	}
-	appIsInitialized = true
-	logging.ConfigureLogging(
-		logging.ParseLevel(logLevel),
-		developmentLogs,
-		map[string]interface{}{"cwd": path.WorkingDirectory()},
-	)
-	logger, _ = logging.CreateLogger()
-	registry := plugins.Registry()
-	endpointManager = endpoints.NewEndpointManager(logger)
-
-	rootCmd.Flags().ParseErrorsWhitelist.UnknownFlags = false
-	_ = rootCmd.ParseFlags(os.Args)
-
-	if err = appConfig.ReadConfig(configFilePath); err != nil {
-		logger.Error(
-			"unrecoverable error occurred during reading the config file",
-			zap.Error(err),
-		)
-		return
-	}
-
-	viperInst := viper.GetViper()
-	pluginDir := viperInst.GetString("plugins-directory")
-
-	if err = api.InitServices(viperInst, logger); err != nil {
-		logger.Error(
-			"failed to initialize app services",
-			zap.Error(err),
-		)
-	}
-
-	pluginLoadStartTime := time.Now()
-	if err = registry.LoadPlugins(pluginDir); err != nil {
-		logger.Error("Failed to load plugins",
-			zap.String("pluginsDirectory", pluginDir),
-			zap.Error(err),
-		)
-	}
-	pluginLoadDuration := time.Since(pluginLoadStartTime)
-	logger.Info(
-		"loading plugins completed",
-		zap.Duration("pluginLoadDuration", pluginLoadDuration),
-	)
-
-	pluginsCmd.AddCommand(registry.PluginCommands()...)
-
-	return
-}

internal/cmd/plugins.go

@@ -5,10 +5,6 @@ import (
 )
 
 var (
-	pluginsCmd *cobra.Command
-)
-
-func init() {
 	pluginsCmd = &cobra.Command{
 		Use:   "plugins",
 		Short: "Use the plugins prefix to interact with commands that are provided by plugins",
@@ -18,5 +14,4 @@ The easiest way to explore what commands are available is to start with 'inetmoc
 This help page contains a list of available sub-commands starting with the name of the plugin as a prefix.
 `,
 	}
-	rootCmd.AddCommand(pluginsCmd, generateCaCmd)
+)
-}

internal/cmd/root.go

@@ -1,77 +1,91 @@
 package cmd
 
 import (
-	"github.com/baez90/inetmock/internal/config"
+	"github.com/baez90/inetmock/internal/plugins"
-	"github.com/baez90/inetmock/internal/endpoints"
 	"github.com/baez90/inetmock/pkg/api"
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
+	"github.com/baez90/inetmock/pkg/path"
 	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
 	"go.uber.org/zap"
-	"os"
+	"time"
-	"os/signal"
-	"strings"
-	"syscall"
 )
 
 var (
 	logger  logging.Logger
-	rootCmd = cobra.Command{
+	rootCmd *cobra.Command
-		Use:   "",
-		Short: "INetMock is lightweight internet mock",
-		Run:   startInetMock,
-	}
 
+	pluginsDirectory string
 	configFilePath   string
 	logLevel         string
 	developmentLogs  bool
-	handlers        []api.ProtocolHandler
-	appConfig       = config.CreateConfig()
-	endpointManager endpoints.EndpointManager
 )
 
 func init() {
-	rootCmd.PersistentFlags().String("plugins-directory", "", "Directory where plugins should be loaded from")
+	cobra.OnInitialize(onInit)
+	rootCmd = &cobra.Command{
+		Use:   "",
+		Short: "INetMock is lightweight internet mock",
+	}
+
+	rootCmd.PersistentFlags().StringVar(&pluginsDirectory, "plugins-directory", "", "Directory where plugins should be loaded from")
 	rootCmd.PersistentFlags().StringVar(&configFilePath, "config", "", "Path to config file that should be used")
 	rootCmd.PersistentFlags().StringVar(&logLevel, "log-level", "info", "logging level to use")
 	rootCmd.PersistentFlags().BoolVar(&developmentLogs, "development-logs", false, "Enable development mode logs")
 
-	appConfig.InitConfig(rootCmd.PersistentFlags())
+	rootCmd.AddCommand(
+		serveCmd,
+		generateCaCmd,
+		pluginsCmd,
+	)
 }
 
-func startInetMock(cmd *cobra.Command, args []string) {
+func onInit() {
-	for endpointName := range viper.GetStringMap(config.EndpointsKey) {
+	logging.ConfigureLogging(
-		handlerSubConfig := viper.Sub(strings.Join([]string{config.EndpointsKey, endpointName}, "."))
+		logging.ParseLevel(logLevel),
-		handlerConfig := config.CreateMultiHandlerConfig(handlerSubConfig)
+		developmentLogs,
-		if err := endpointManager.CreateEndpoint(endpointName, handlerConfig); err != nil {
+		map[string]interface{}{"cwd": path.WorkingDirectory()},
-			logger.Warn(
+	)
-				"error occurred while creating endpoint",
+
-				zap.String("endpointName", endpointName),
+	logger, _ = logging.CreateLogger()
-				zap.String("handlerName", handlerConfig.HandlerName()),
+	config.CreateConfig(rootCmd.Flags())
+	appConfig := config.Instance()
+
+	if err := appConfig.ReadConfig(configFilePath); err != nil {
+		logger.Error(
+			"failed to read config file",
 			zap.Error(err),
 		)
 	}
+
+	if err := api.InitServices(appConfig, logger); err != nil {
+		logger.Error(
+			"failed to initialize app services",
+			zap.Error(err),
+		)
 	}
 
-	endpointManager.StartEndpoints()
+	registry := plugins.Registry()
 
-	signalChannel := make(chan os.Signal, 1)
+	cfg := config.Instance()
-	signal.Notify(signalChannel, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
-
-	// block until canceled
-	s := <-signalChannel
 
+	pluginLoadStartTime := time.Now()
+	if err := registry.LoadPlugins(cfg.PluginsDir()); err != nil {
+		logger.Error("Failed to load plugins",
+			zap.String("pluginsDirectory", cfg.PluginsDir()),
+			zap.Error(err),
+		)
+	}
+	pluginLoadDuration := time.Since(pluginLoadStartTime)
 	logger.Info(
-		"got signal to quit",
+		"loading plugins completed",
-		zap.String("signal", s.String()),
+		zap.Duration("pluginLoadDuration", pluginLoadDuration),
 	)
 
-	endpointManager.ShutdownEndpoints()
+	pluginsCmd.AddCommand(registry.PluginCommands()...)
+
 }
 
 func ExecuteRootCommand() error {
-	if err := initApp(); err != nil {
-		return err
-	}
 	return rootCmd.Execute()
 }

internal/cmd/serve.go

@@ -0,0 +1,54 @@
+package cmd
+
+import (
+	"github.com/baez90/inetmock/internal/endpoints"
+	"github.com/baez90/inetmock/pkg/config"
+	"github.com/spf13/cobra"
+	"go.uber.org/zap"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+)
+
+var (
+	endpointManager endpoints.EndpointManager
+	serveCmd        = &cobra.Command{
+		Use:   "serve",
+		Short: "Starts the INetMock server",
+		Long:  ``,
+		Run:   startINetMock,
+	}
+)
+
+func startINetMock(_ *cobra.Command, _ []string) {
+	endpointManager = endpoints.NewEndpointManager(logger)
+	cfg := config.Instance()
+	for endpointName, endpointHandler := range cfg.EndpointConfigs() {
+		handlerSubConfig := cfg.Viper().Sub(strings.Join([]string{config.EndpointsKey, endpointName, config.OptionsKey}, "."))
+		endpointHandler.Options = handlerSubConfig
+		if err := endpointManager.CreateEndpoint(endpointName, endpointHandler); err != nil {
+			logger.Warn(
+				"error occurred while creating endpoint",
+				zap.String("endpointName", endpointName),
+				zap.String("handlerName", endpointHandler.Handler),
+				zap.Error(err),
+			)
+		}
+	}
+
+	endpointManager.StartEndpoints()
+
+	signalChannel := make(chan os.Signal, 1)
+	signal.Notify(signalChannel, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
+
+	// block until canceled
+	s := <-signalChannel
+
+	logger.Info(
+		"got signal to quit",
+		zap.String("signal", s.String()),
+	)
+
+	endpointManager.ShutdownEndpoints()
+}

internal/config/constants.go

@@ -1,6 +0,0 @@
-package config
-
-const (
-	EndpointsKey = "endpoints"
-	OptionsKey   = "options"
-)

internal/config/loading.go

@@ -1,55 +0,0 @@
-package config
-
-import (
-	"github.com/baez90/inetmock/pkg/logging"
-	"github.com/baez90/inetmock/pkg/path"
-	"github.com/spf13/pflag"
-	"github.com/spf13/viper"
-	"go.uber.org/zap"
-	"strings"
-)
-
-func CreateConfig() Config {
-	logger, _ := logging.CreateLogger()
-	return &config{
-		logger: logger.Named("Config"),
-	}
-}
-
-type Config interface {
-	InitConfig(flags *pflag.FlagSet)
-	ReadConfig(configFilePath string) error
-}
-
-type config struct {
-	logger logging.Logger
-}
-
-func (c config) InitConfig(flags *pflag.FlagSet) {
-	viper.SetConfigName("config")
-	viper.SetConfigType("yaml")
-	viper.AddConfigPath("/etc/inetmock/")
-	viper.AddConfigPath("$HOME/.inetmock")
-	viper.AddConfigPath(".")
-	viper.SetEnvPrefix("INetMock")
-	_ = viper.BindPFlags(flags)
-	viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
-	viper.AutomaticEnv()
-}
-
-func (c *config) ReadConfig(configFilePath string) (err error) {
-	if configFilePath != "" && path.FileExists(configFilePath) {
-		c.logger.Info(
-			"loading config from passed config file path",
-			zap.String("configFilePath", configFilePath),
-		)
-		viper.SetConfigFile(configFilePath)
-	}
-	if err = viper.ReadInConfig(); err != nil {
-		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
-			err = nil
-			c.logger.Warn("failed to load config")
-		}
-	}
-	return
-}

internal/config/multi_handler_config.go

@@ -1,49 +0,0 @@
-package config
-
-import (
-	"github.com/baez90/inetmock/pkg/api"
-	"github.com/spf13/viper"
-)
-
-type MultiHandlerConfig interface {
-	HandlerName() string
-	ListenAddress() string
-	Ports() []uint16
-	Options() *viper.Viper
-	HandlerConfigs() []api.HandlerConfig
-}
-
-type multiHandlerConfig struct {
-	handlerName   string
-	ports         []uint16
-	listenAddress string
-	options       *viper.Viper
-}
-
-func NewMultiHandlerConfig(handlerName string, ports []uint16, listenAddress string, options *viper.Viper) MultiHandlerConfig {
-	return &multiHandlerConfig{handlerName: handlerName, ports: ports, listenAddress: listenAddress, options: options}
-}
-
-func (m multiHandlerConfig) HandlerName() string {
-	return m.handlerName
-}
-
-func (m multiHandlerConfig) ListenAddress() string {
-	return m.listenAddress
-}
-
-func (m multiHandlerConfig) Ports() []uint16 {
-	return m.ports
-}
-
-func (m multiHandlerConfig) Options() *viper.Viper {
-	return m.options
-}
-
-func (m multiHandlerConfig) HandlerConfigs() []api.HandlerConfig {
-	configs := make([]api.HandlerConfig, 0)
-	for _, port := range m.ports {
-		configs = append(configs, api.NewHandlerConfig(m.handlerName, port, m.listenAddress, m.options))
-	}
-	return configs
-}

internal/config/multi_handler_config_test.go

@@ -1,226 +0,0 @@
-package config
-
-import (
-	"github.com/baez90/inetmock/pkg/api"
-	"github.com/spf13/viper"
-	"reflect"
-	"testing"
-)
-
-func Test_multiHandlerConfig_HandlerConfigs(t *testing.T) {
-	type fields struct {
-		handlerName   string
-		ports         []uint16
-		listenAddress string
-		options       *viper.Viper
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		want   []api.HandlerConfig
-	}{
-		{
-			name:   "Get empty array if no ports are set",
-			fields: fields{},
-			want:   make([]api.HandlerConfig, 0),
-		},
-		{
-			name: "Get a single handler config if only one port is set",
-			fields: fields{
-				handlerName:   "sampleHandler",
-				ports:         []uint16{80},
-				listenAddress: "0.0.0.0",
-				options:       nil,
-			},
-			want: []api.HandlerConfig{
-				api.NewHandlerConfig("sampleHandler", 80, "0.0.0.0", nil),
-			},
-		},
-		{
-			name: "Get multiple handler configs if only one port is set",
-			fields: fields{
-				handlerName:   "sampleHandler",
-				ports:         []uint16{80, 8080},
-				listenAddress: "0.0.0.0",
-				options:       nil,
-			},
-			want: []api.HandlerConfig{
-				api.NewHandlerConfig("sampleHandler", 80, "0.0.0.0", nil),
-				api.NewHandlerConfig("sampleHandler", 8080, "0.0.0.0", nil),
-			},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			m := multiHandlerConfig{
-				handlerName:   tt.fields.handlerName,
-				ports:         tt.fields.ports,
-				listenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
-			}
-			if got := m.HandlerConfigs(); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("HandlerConfigs() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func Test_multiHandlerConfig_HandlerName(t *testing.T) {
-	type fields struct {
-		handlerName   string
-		ports         []uint16
-		listenAddress string
-		options       *viper.Viper
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		want   string
-	}{
-		{
-			name:   "Get empty handler name for uninitialized struct",
-			fields: fields{},
-			want:   "",
-		},
-		{
-			name: "Get expected handler name for initialized struct",
-			fields: fields{
-				handlerName: "sampleHandler",
-			},
-			want: "sampleHandler",
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			m := multiHandlerConfig{
-				handlerName:   tt.fields.handlerName,
-				ports:         tt.fields.ports,
-				listenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
-			}
-			if got := m.HandlerName(); got != tt.want {
-				t.Errorf("HandlerName() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func Test_multiHandlerConfig_ListenAddress(t *testing.T) {
-	type fields struct {
-		handlerName   string
-		ports         []uint16
-		listenAddress string
-		options       *viper.Viper
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		want   string
-	}{
-		{
-			name:   "Get empty ListenAddress for uninitialized struct",
-			fields: fields{},
-			want:   "",
-		},
-		{
-			name: "Get expected ListenAddress for initialized struct",
-			fields: fields{
-				listenAddress: "0.0.0.0",
-			},
-			want: "0.0.0.0",
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			m := multiHandlerConfig{
-				handlerName:   tt.fields.handlerName,
-				ports:         tt.fields.ports,
-				listenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
-			}
-			if got := m.ListenAddress(); got != tt.want {
-				t.Errorf("ListenAddress() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func Test_multiHandlerConfig_Options(t *testing.T) {
-	type fields struct {
-		handlerName   string
-		ports         []uint16
-		listenAddress string
-		options       *viper.Viper
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		want   *viper.Viper
-	}{
-		{
-			name:   "Get nil Options for uninitialized struct",
-			fields: fields{},
-			want:   nil,
-		},
-		{
-			name: "Get expected Options for initialized struct",
-			fields: fields{
-				options: viper.New(),
-			},
-			want: viper.New(),
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			m := multiHandlerConfig{
-				handlerName:   tt.fields.handlerName,
-				ports:         tt.fields.ports,
-				listenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
-			}
-			if got := m.Options(); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("Options() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func Test_multiHandlerConfig_Ports(t *testing.T) {
-	type fields struct {
-		handlerName   string
-		ports         []uint16
-		listenAddress string
-		options       *viper.Viper
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		want   []uint16
-	}{
-		{
-			name:   "Get empty Ports for uninitialized struct",
-			fields: fields{},
-			want:   nil,
-		},
-		{
-			name: "Get expected Ports for initialized struct",
-			fields: fields{
-				ports: []uint16{80, 8080},
-			},
-			want: []uint16{80, 8080},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			m := multiHandlerConfig{
-				handlerName:   tt.fields.handlerName,
-				ports:         tt.fields.ports,
-				listenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
-			}
-			if got := m.Ports(); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("Ports() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}

internal/config/parsing.go

@@ -1,35 +0,0 @@
-package config
-
-import (
-	"github.com/spf13/viper"
-)
-
-const (
-	pluginConfigKey        = "handler"
-	listenAddressConfigKey = "listenAddress"
-	portConfigKey          = "port"
-	portsConfigKey         = "ports"
-)
-
-func CreateMultiHandlerConfig(handlerConfig *viper.Viper) MultiHandlerConfig {
-	return NewMultiHandlerConfig(
-		handlerConfig.GetString(pluginConfigKey),
-		portsFromConfig(handlerConfig),
-		handlerConfig.GetString(listenAddressConfigKey),
-		handlerConfig.Sub(OptionsKey),
-	)
-}
-
-func portsFromConfig(handlerConfig *viper.Viper) (ports []uint16) {
-	if portsInt := handlerConfig.GetIntSlice(portsConfigKey); len(portsInt) > 0 {
-		for _, port := range portsInt {
-			ports = append(ports, uint16(port))
-		}
-		return
-	}
-
-	if portInt := handlerConfig.GetInt(portConfigKey); portInt > 0 {
-		ports = append(ports, uint16(portInt))
-	}
-	return
-}

internal/config/parsing_test.go

@@ -1,145 +0,0 @@
-package config
-
-import (
-	"bytes"
-	"github.com/spf13/viper"
-	"reflect"
-	"testing"
-)
-
-func TestCreateMultiHandlerConfig(t *testing.T) {
-	type args struct {
-		handlerConfig *viper.Viper
-	}
-	tests := []struct {
-		name string
-		args args
-		want MultiHandlerConfig
-	}{
-		{
-			name: "Get simple multiHandlerConfig from config",
-			args: args{
-				handlerConfig: configFromString(`
-handler: sampleHandler
-listenAddress: 0.0.0.0
-ports:
-- 80
-- 8080
-options: {}
-`),
-			},
-			want: &multiHandlerConfig{
-				handlerName:   "sampleHandler",
-				ports:         []uint16{80, 8080},
-				listenAddress: "0.0.0.0",
-				options:       viper.New(),
-			},
-		},
-		{
-			name: "Get more complex multiHandlerConfig from config",
-			args: args{
-				handlerConfig: configFromString(`
-handler: sampleHandler
-listenAddress: 0.0.0.0
-ports:
-- 80
-- 8080
-options:
-  optionA: asdf
-  optionB: as1234
-`),
-			},
-			want: &multiHandlerConfig{
-				handlerName:   "sampleHandler",
-				ports:         []uint16{80, 8080},
-				listenAddress: "0.0.0.0",
-				options: configFromString(`
-nesting:
-  optionA: asdf
-  optionB: as1234
-`).Sub("nesting"),
-			},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := CreateMultiHandlerConfig(tt.args.handlerConfig); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("CreateMultiHandlerConfig() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func Test_portsFromConfig(t *testing.T) {
-	type args struct {
-		handlerConfig *viper.Viper
-	}
-	tests := []struct {
-		name      string
-		args      args
-		wantPorts []uint16
-	}{
-		{
-			name: "Empty array if config value is not set",
-			args: args{
-				handlerConfig: viper.New(),
-			},
-			wantPorts: nil,
-		},
-		{
-			name: "Array of one if `port` is set",
-			args: args{
-				handlerConfig: configFromString(`
-port: 80
-`),
-			},
-			wantPorts: []uint16{80},
-		},
-		{
-			name: "Array of one if `ports` is set as array",
-			args: args{
-				handlerConfig: configFromString(`
-ports:
-- 80
-`),
-			},
-			wantPorts: []uint16{80},
-		},
-		{
-			name: "Array of two if `ports` is set as array",
-			args: args{
-				handlerConfig: configFromString(`
-ports:
-- 80
-- 8080
-`),
-			},
-			wantPorts: []uint16{80, 8080},
-		},
-		{
-			name: "Array of two if `port` is set as array",
-			args: args{
-				handlerConfig: configFromString(`
-ports:
-- 80
-- 8080
-`),
-			},
-			wantPorts: []uint16{80, 8080},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if gotPorts := portsFromConfig(tt.args.handlerConfig); !reflect.DeepEqual(gotPorts, tt.wantPorts) {
-				t.Errorf("portsFromConfig() = %v, want %v", gotPorts, tt.wantPorts)
-			}
-		})
-	}
-}
-
-func configFromString(yaml string) (config *viper.Viper) {
-	config = viper.New()
-	config.SetConfigType("yaml")
-	_ = config.ReadConfig(bytes.NewBufferString(yaml))
-	return
-}

internal/endpoints/endpoint.go

@@ -3,6 +3,7 @@ package endpoints
 
 import (
 	"github.com/baez90/inetmock/pkg/api"
+	"github.com/baez90/inetmock/pkg/config"
 )
 
 type Endpoint interface {
@@ -14,7 +15,7 @@ type Endpoint interface {
 type endpoint struct {
 	name    string
 	handler api.ProtocolHandler
-	config  api.HandlerConfig
+	config  config.HandlerConfig
 }
 
 func (e endpoint) Name() string {

internal/endpoints/endpoint_manager.go

@@ -2,8 +2,8 @@ package endpoints
 
 import (
 	"fmt"
-	"github.com/baez90/inetmock/internal/config"
 	"github.com/baez90/inetmock/internal/plugins"
+	config2 "github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
 	"go.uber.org/zap"
 	"sync"
@@ -13,7 +13,7 @@ import (
 type EndpointManager interface {
 	RegisteredEndpoints() []Endpoint
 	StartedEndpoints() []Endpoint
-	CreateEndpoint(name string, multiHandlerConfig config.MultiHandlerConfig) error
+	CreateEndpoint(name string, multiHandlerConfig config2.MultiHandlerConfig) error
 	StartEndpoints()
 	ShutdownEndpoints()
 }
@@ -40,16 +40,16 @@ func (e endpointManager) StartedEndpoints() []Endpoint {
 	return e.properlyStartedEndpoints
 }
 
-func (e *endpointManager) CreateEndpoint(name string, multiHandlerConfig config.MultiHandlerConfig) error {
+func (e *endpointManager) CreateEndpoint(name string, multiHandlerConfig config2.MultiHandlerConfig) error {
 	for _, handlerConfig := range multiHandlerConfig.HandlerConfigs() {
-		if handler, ok := e.registry.HandlerForName(multiHandlerConfig.HandlerName()); ok {
+		if handler, ok := e.registry.HandlerForName(multiHandlerConfig.Handler); ok {
 			e.registeredEndpoints = append(e.registeredEndpoints, &endpoint{
 				name:    name,
 				handler: handler,
 				config:  handlerConfig,
 			})
 		} else {
-			return fmt.Errorf("no matching handler registered for names %s", multiHandlerConfig.HandlerName())
+			return fmt.Errorf("no matching handler registered for names %s", multiHandlerConfig.Handler)
 		}
 	}
 

internal/endpoints/endpoint_manager_test.go

@@ -1,11 +1,11 @@
 package endpoints
 
 import (
-	"github.com/baez90/inetmock/internal/config"
 	api_mock "github.com/baez90/inetmock/internal/mock/api"
 	logging_mock "github.com/baez90/inetmock/internal/mock/logging"
 	plugins_mock "github.com/baez90/inetmock/internal/mock/plugins"
 	"github.com/baez90/inetmock/internal/plugins"
+	config2 "github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
 	"github.com/golang/mock/gomock"
 	"testing"
@@ -20,7 +20,7 @@ func Test_endpointManager_CreateEndpoint(t *testing.T) {
 	}
 	type args struct {
 		name               string
-		multiHandlerConfig config.MultiHandlerConfig
+		multiHandlerConfig config2.MultiHandlerConfig
 	}
 	tests := []struct {
 		name          string
@@ -52,12 +52,11 @@ func Test_endpointManager_CreateEndpoint(t *testing.T) {
 			},
 			args: args{
 				name: "sampleEndpoint",
-				multiHandlerConfig: config.NewMultiHandlerConfig(
+				multiHandlerConfig: config2.MultiHandlerConfig{
-					"sampleHandler",
+					Handler:       "sampleHandler",
-					[]uint16{80},
+					Ports:         []uint16{80},
-					"0.0.0.0",
+					ListenAddress: "0.0.0.0",
-					nil,
+				},
-				),
 			},
 		},
 		{
@@ -83,12 +82,11 @@ func Test_endpointManager_CreateEndpoint(t *testing.T) {
 			},
 			args: args{
 				name: "sampleEndpoint",
-				multiHandlerConfig: config.NewMultiHandlerConfig(
+				multiHandlerConfig: config2.MultiHandlerConfig{
-					"sampleHandler",
+					Handler:       "sampleHandler",
-					[]uint16{80},
+					Ports:         []uint16{80},
-					"0.0.0.0",
+					ListenAddress: "0.0.0.0",
-					nil,
+				},
-				),
 			},
 		},
 	}

internal/endpoints/endpoint_test.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	api_mock "github.com/baez90/inetmock/internal/mock/api"
 	"github.com/baez90/inetmock/pkg/api"
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/golang/mock/gomock"
 	"testing"
 )
@@ -12,7 +13,7 @@ func Test_endpoint_Name(t *testing.T) {
 	type fields struct {
 		name    string
 		handler api.ProtocolHandler
-		config  api.HandlerConfig
+		config  config.HandlerConfig
 	}
 	tests := []struct {
 		name   string
@@ -50,7 +51,7 @@ func Test_endpoint_Shutdown(t *testing.T) {
 	type fields struct {
 		name    string
 		handler api.ProtocolHandler
-		config  api.HandlerConfig
+		config  config.HandlerConfig
 	}
 	tests := []struct {
 		name    string
@@ -102,17 +103,16 @@ func Test_endpoint_Shutdown(t *testing.T) {
 
 func Test_endpoint_Start(t *testing.T) {
 
-	demoHandlerConfig := api.NewHandlerConfig(
+	demoHandlerConfig := config.HandlerConfig{
-		"sampleHandler",
+		HandlerName:   "sampleHandler",
-		80,
+		Port:          80,
-		"0.0.0.0",
+		ListenAddress: "0.0.0.0",
-		nil,
+	}
-	)
 
 	type fields struct {
 		name    string
 		handler api.ProtocolHandler
-		config  api.HandlerConfig
+		config  config.HandlerConfig
 	}
 	tests := []struct {
 		name    string
@@ -125,7 +125,7 @@ func Test_endpoint_Start(t *testing.T) {
 				handler: func() api.ProtocolHandler {
 					handler := api_mock.NewMockProtocolHandler(gomock.NewController(t))
 					handler.EXPECT().
-						Start(nil).
+						Start(gomock.Any()).
 						MaxTimes(1).
 						Return(nil)
 					return handler
@@ -139,7 +139,7 @@ func Test_endpoint_Start(t *testing.T) {
 				handler: func() api.ProtocolHandler {
 					handler := api_mock.NewMockProtocolHandler(gomock.NewController(t))
 					handler.EXPECT().
-						Start(nil).
+						Start(gomock.Any()).
 						MaxTimes(1).
 						Return(fmt.Errorf(""))
 					return handler

internal/plugins/loading.go

@@ -10,6 +10,7 @@ import (
 	"path/filepath"
 	"plugin"
 	"regexp"
+	"strings"
 )
 
 var (
@@ -19,6 +20,7 @@ var (
 
 type HandlerRegistry interface {
 	LoadPlugins(pluginsPath string) error
+	AvailableHandlers() []string
 	RegisterHandler(handlerName string, handlerProvider api.PluginInstanceFactory, subCommands ...*cobra.Command)
 	HandlerForName(handlerName string) (api.ProtocolHandler, bool)
 	PluginCommands() []*cobra.Command
@@ -29,11 +31,19 @@ type handlerRegistry struct {
 	pluginCommands []*cobra.Command
 }
 
+func (h handlerRegistry) AvailableHandlers() (availableHandlers []string) {
+	for s := range h.handlers {
+		availableHandlers = append(availableHandlers, s)
+	}
+	return
+}
+
 func (h handlerRegistry) PluginCommands() []*cobra.Command {
 	return h.pluginCommands
 }
 
 func (h *handlerRegistry) HandlerForName(handlerName string) (instance api.ProtocolHandler, ok bool) {
+	handlerName = strings.ToLower(handlerName)
 	var provider api.PluginInstanceFactory
 	if provider, ok = h.handlers[handlerName]; ok {
 		instance = provider()
@@ -42,6 +52,7 @@ func (h *handlerRegistry) HandlerForName(handlerName string) (instance api.Proto
 }
 
 func (h *handlerRegistry) RegisterHandler(handlerName string, handlerProvider api.PluginInstanceFactory, subCommands ...*cobra.Command) {
+	handlerName = strings.ToLower(handlerName)
 	if _, exists := h.handlers[handlerName]; exists {
 		panic(fmt.Sprintf("handler with name %s is already registered - there's something strange...in the neighborhood", handlerName))
 	}

mock_config.yaml

@@ -25,8 +25,8 @@ tls:
       NotBeforeRelative: 168h
       NotAfterRelative: 168h
   rootCaCert:
-    publicKey: ./ca.pem
+    publicKeyPath: ./ca.pem
-    privateKey: ./ca.key
+    privateKeyPath: ./ca.key
   certCachePath: /tmp/inetmock/
 
 endpoints:
@@ -41,7 +41,8 @@ endpoints:
   proxy:
     handler: http_proxy
     listenAddress: 0.0.0.0
-    port: 3128
+    ports:
+    - 3128
     options:
       target:
         ipAddress: 127.0.0.1
@@ -59,7 +60,8 @@ endpoints:
   plainDns:
     handler: dns_mock
     listenAddress: 0.0.0.0
-    port: 53
+    ports:
+    - 53
     options:
       rules:
         - pattern: ".*\\.google\\.com"
@@ -73,7 +75,8 @@ endpoints:
   dnsOverTlsDowngrade:
     handler: tls_interceptor
     listenAddress: 0.0.0.0
-    port: 853
+    ports:
+    - 853
     options:
       target:
         ipAddress: 127.0.0.1

pkg/api/handler_config.go

@@ -1,42 +0,0 @@
-package api
-
-import "github.com/spf13/viper"
-
-type HandlerConfig interface {
-	HandlerName() string
-	ListenAddress() string
-	Port() uint16
-	Options() *viper.Viper
-}
-
-func NewHandlerConfig(handlerName string, port uint16, listenAddress string, options *viper.Viper) HandlerConfig {
-	return &handlerConfig{
-		handlerName:   handlerName,
-		port:          port,
-		listenAddress: listenAddress,
-		options:       options,
-	}
-}
-
-type handlerConfig struct {
-	handlerName   string
-	port          uint16
-	listenAddress string
-	options       *viper.Viper
-}
-
-func (h handlerConfig) HandlerName() string {
-	return h.handlerName
-}
-
-func (h handlerConfig) ListenAddress() string {
-	return h.listenAddress
-}
-
-func (h handlerConfig) Port() uint16 {
-	return h.port
-}
-
-func (h handlerConfig) Options() *viper.Viper {
-	return h.options
-}

pkg/api/protocol_handler.go

@@ -2,6 +2,7 @@
 package api
 
 import (
+	"github.com/baez90/inetmock/pkg/config"
 	"go.uber.org/zap"
 )
 
@@ -10,6 +11,6 @@ type PluginInstanceFactory func() ProtocolHandler
 type LoggingFactory func() (*zap.Logger, error)
 
 type ProtocolHandler interface {
-	Start(config HandlerConfig) error
+	Start(config config.HandlerConfig) error
 	Shutdown() error
 }

pkg/api/services.go

@@ -2,8 +2,8 @@ package api
 
 import (
 	"github.com/baez90/inetmock/pkg/cert"
+	config2 "github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
-	"github.com/spf13/viper"
 )
 
 var (
@@ -19,7 +19,7 @@ type services struct {
 }
 
 func InitServices(
-	config *viper.Viper,
+	config config2.Config,
 	logger logging.Logger,
 ) error {
 	certStore, err := cert.NewDefaultStore(config, logger)

pkg/cert/cache_test.go

@@ -5,6 +5,7 @@ import (
 	"crypto/x509"
 	"fmt"
 	certmock "github.com/baez90/inetmock/internal/mock/cert"
+	config2 "github.com/baez90/inetmock/pkg/config"
 	"github.com/golang/mock/gomock"
 	"os"
 	"path"
@@ -284,13 +285,13 @@ func Test_fileSystemCache_Put(t *testing.T) {
 }
 
 func setupCertGen() Generator {
-	return NewDefaultGenerator(Options{
+	return NewDefaultGenerator(config2.CertOptions{
-		Validity: ValidityByPurpose{
+		Validity: config2.ValidityByPurpose{
-			Server: ValidityDuration{
+			Server: config2.ValidityDuration{
 				NotBeforeRelative: serverRelativeValidity,
 				NotAfterRelative:  serverRelativeValidity,
 			},
-			CA: ValidityDuration{
+			CA: config2.ValidityDuration{
 				NotBeforeRelative: caRelativeValidity,
 				NotAfterRelative:  caRelativeValidity,
 			},

pkg/cert/constants.go

@@ -1,19 +1,11 @@
 package cert
 
 const (
-	CurveTypeP224    CurveType = "P224"
-	CurveTypeP256    CurveType = "P256"
-	CurveTypeP384    CurveType = "P384"
-	CurveTypeP521    CurveType = "P521"
-	CurveTypeED25519 CurveType = "ED25519"
-
 	defaultServerValidityDuration = "168h"
 	defaultCAValidityDuration     = "17520h"
 
 	certCachePathConfigKey         = "tls.certCachePath"
 	ecdsaCurveConfigKey            = "tls.ecdsaCurve"
-	publicKeyConfigKey             = "tls.rootCaCert.publicKey"
-	privateKeyPathConfigKey        = "tls.rootCaCert.privateKey"
 	caCertValidityNotBeforeKey     = "tls.validity.ca.notBeforeRelative"
 	caCertValidityNotAfterKey      = "tls.validity.ca.notAfterRelative"
 	serverCertValidityNotBeforeKey = "tls.validity.server.notBeforeRelative"

pkg/cert/generator.go

@@ -8,6 +8,7 @@ import (
 	"crypto/x509"
 	"crypto/x509/pkix"
 	"encoding/pem"
+	config2 "github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/defaulting"
 	"math/big"
 	"net"
@@ -35,11 +36,11 @@ type Generator interface {
 	ServerCert(options GenerationOptions, ca *tls.Certificate) (*tls.Certificate, error)
 }
 
-func NewDefaultGenerator(options Options) Generator {
+func NewDefaultGenerator(options config2.CertOptions) Generator {
 	return NewGenerator(options, NewTimeSource(), defaultKeyProvider(options))
 }
 
-func NewGenerator(options Options, source TimeSource, provider KeyProvider) Generator {
+func NewGenerator(options config2.CertOptions, source TimeSource, provider KeyProvider) Generator {
 	return &generator{
 		options:    options,
 		provider:   provider,
@@ -48,7 +49,7 @@ func NewGenerator(options Options, source TimeSource, provider KeyProvider) Gene
 }
 
 type generator struct {
-	options    Options
+	options    config2.CertOptions
 	provider   KeyProvider
 	timeSource TimeSource
 	outDir     string

pkg/cert/options.go

@@ -1,79 +1,15 @@
 package cert
 
 import (
-	"fmt"
+	"github.com/baez90/inetmock/pkg/config"
-	"github.com/spf13/viper"
 	"os"
-	"strings"
-	"time"
 )
 
-var (
+func init() {
-	requiredConfigKeys = []string{
+	config.AddDefaultValue(certCachePathConfigKey, os.TempDir())
-		publicKeyConfigKey,
+	config.AddDefaultValue(ecdsaCurveConfigKey, string(config.CurveTypeED25519))
-		privateKeyPathConfigKey,
+	config.AddDefaultValue(caCertValidityNotBeforeKey, defaultCAValidityDuration)
-	}
+	config.AddDefaultValue(caCertValidityNotAfterKey, defaultCAValidityDuration)
-)
+	config.AddDefaultValue(serverCertValidityNotBeforeKey, defaultServerValidityDuration)
-
+	config.AddDefaultValue(serverCertValidityNotAfterKey, defaultServerValidityDuration)
-type CurveType string
-
-type File struct {
-	PublicKeyPath  string
-	PrivateKeyPath string
-}
-
-type ValidityDuration struct {
-	NotBeforeRelative time.Duration
-	NotAfterRelative  time.Duration
-}
-
-type ValidityByPurpose struct {
-	CA     ValidityDuration
-	Server ValidityDuration
-}
-
-type Options struct {
-	RootCACert    File
-	CertCachePath string
-	Curve         CurveType
-	Validity      ValidityByPurpose
-}
-
-func loadFromConfig(config *viper.Viper) (Options, error) {
-	missingKeys := make([]string, 0)
-	for _, requiredKey := range requiredConfigKeys {
-		if !config.IsSet(requiredKey) {
-			missingKeys = append(missingKeys, requiredKey)
-		}
-	}
-
-	if len(missingKeys) > 0 {
-		return Options{}, fmt.Errorf("config keys are missing: %s", strings.Join(missingKeys, ", "))
-	}
-
-	config.SetDefault(certCachePathConfigKey, os.TempDir())
-	config.SetDefault(ecdsaCurveConfigKey, string(CurveTypeED25519))
-	config.SetDefault(caCertValidityNotBeforeKey, defaultCAValidityDuration)
-	config.SetDefault(caCertValidityNotAfterKey, defaultCAValidityDuration)
-	config.SetDefault(serverCertValidityNotBeforeKey, defaultServerValidityDuration)
-	config.SetDefault(serverCertValidityNotAfterKey, defaultServerValidityDuration)
-
-	return Options{
-		CertCachePath: config.GetString(certCachePathConfigKey),
-		Curve:         CurveType(config.GetString(ecdsaCurveConfigKey)),
-		Validity: ValidityByPurpose{
-			CA: ValidityDuration{
-				NotBeforeRelative: config.GetDuration(caCertValidityNotBeforeKey),
-				NotAfterRelative:  config.GetDuration(caCertValidityNotAfterKey),
-			},
-			Server: ValidityDuration{
-				NotBeforeRelative: config.GetDuration(serverCertValidityNotBeforeKey),
-				NotAfterRelative:  config.GetDuration(serverCertValidityNotAfterKey),
-			},
-		},
-		RootCACert: File{
-			PublicKeyPath:  config.GetString(publicKeyConfigKey),
-			PrivateKeyPath: config.GetString(privateKeyPathConfigKey),
-		},
-	}, nil
 }

pkg/cert/options_test.go

@@ -1,9 +1,9 @@
 package cert
 
 import (
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/spf13/viper"
 	"os"
-	"reflect"
 	"strings"
 	"testing"
 	"time"
@@ -25,7 +25,7 @@ func Test_loadFromConfig(t *testing.T) {
 	tests := []struct {
 		name    string
 		args    args
-		want    Options
+		want    config.CertOptions
 		wantErr bool
 	}{
 		{
@@ -48,19 +48,19 @@ tls:
   certCachePath: /tmp/inetmock/
 `),
 			},
-			want: Options{
+			want: config.CertOptions{
-				RootCACert: File{
+				RootCACert: config.File{
 					PublicKeyPath:  "./ca.pem",
 					PrivateKeyPath: "./ca.key",
 				},
 				CertCachePath: "/tmp/inetmock/",
-				Curve:         CurveTypeP256,
+				Curve:         config.CurveTypeP256,
-				Validity: ValidityByPurpose{
+				Validity: config.ValidityByPurpose{
-					CA: ValidityDuration{
+					CA: config.ValidityDuration{
 						NotBeforeRelative: 17520 * time.Hour,
 						NotAfterRelative:  17520 * time.Hour,
 					},
-					Server: ValidityDuration{
+					Server: config.ValidityDuration{
 						NotBeforeRelative: 168 * time.Hour,
 						NotAfterRelative:  168 * time.Hour,
 					},
@@ -76,7 +76,7 @@ tls:
     privateKey: ./ca.key
 `),
 			},
-			want:    Options{},
+			want:    config.CertOptions{},
 			wantErr: true,
 		},
 		{
@@ -88,7 +88,7 @@ tls:
     publicKey: ./ca.pem
 `),
 			},
-			want:    Options{},
+			want:    config.CertOptions{},
 			wantErr: true,
 		},
 		{
@@ -101,19 +101,19 @@ tls:
     privateKey: ./ca.key
 `),
 			},
-			want: Options{
+			want: config.CertOptions{
-				RootCACert: File{
+				RootCACert: config.File{
 					PublicKeyPath:  "./ca.pem",
 					PrivateKeyPath: "./ca.key",
 				},
 				CertCachePath: os.TempDir(),
-				Curve:         CurveTypeED25519,
+				Curve:         config.CurveTypeED25519,
-				Validity: ValidityByPurpose{
+				Validity: config.ValidityByPurpose{
-					CA: ValidityDuration{
+					CA: config.ValidityDuration{
 						NotBeforeRelative: 17520 * time.Hour,
 						NotAfterRelative:  17520 * time.Hour,
 					},
-					Server: ValidityDuration{
+					Server: config.ValidityDuration{
 						NotBeforeRelative: 168 * time.Hour,
 						NotAfterRelative:  168 * time.Hour,
 					},
@@ -124,14 +124,7 @@ tls:
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got, err := loadFromConfig(tt.args.config)
+
-			if (err != nil) != tt.wantErr {
-				t.Errorf("loadFromConfig() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("loadFromConfig() got = %v, want %v", got, tt.want)
-			}
 		})
 	}
 }

pkg/cert/store.go

@@ -7,8 +7,8 @@ import (
 	"crypto/rand"
 	"crypto/tls"
 	"crypto/x509"
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
-	"github.com/spf13/viper"
 	"go.uber.org/zap"
 	"net"
 )
@@ -18,7 +18,7 @@ const (
 )
 
 var (
-	defaultKeyProvider = func(options Options) func() (key interface{}, err error) {
+	defaultKeyProvider = func(options config.CertOptions) func() (key interface{}, err error) {
 		return func() (key interface{}, err error) {
 			return privateKeyForCurve(options)
 		}
@@ -34,24 +34,20 @@ type Store interface {
 }
 
 func NewDefaultStore(
-	config *viper.Viper,
+	config config.Config,
 	logger logging.Logger,
 ) (Store, error) {
-	options, err := loadFromConfig(config)
-	if err != nil {
-		return nil, err
-	}
 	timeSource := NewTimeSource()
 	return NewStore(
-		options,
+		config.TLSConfig(),
-		NewFileSystemCache(options.CertCachePath, timeSource),
+		NewFileSystemCache(config.TLSConfig().CertCachePath, timeSource),
-		NewDefaultGenerator(options),
+		NewDefaultGenerator(config.TLSConfig()),
 		logger,
 	)
 }
 
 func NewStore(
-	options Options,
+	options config.CertOptions,
 	cache Cache,
 	generator Generator,
 	logger logging.Logger,
@@ -71,7 +67,7 @@ func NewStore(
 }
 
 type store struct {
-	options    Options
+	options    config.CertOptions
 	caCert     *tls.Certificate
 	cache      Cache
 	timeSource TimeSource
@@ -135,15 +131,15 @@ func (s *store) GetCertificate(serverName string, ip string) (cert *tls.Certific
 	return
 }
 
-func privateKeyForCurve(options Options) (privateKey interface{}, err error) {
+func privateKeyForCurve(options config.CertOptions) (privateKey interface{}, err error) {
 	switch options.Curve {
-	case CurveTypeP224:
+	case config.CurveTypeP224:
 		privateKey, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
-	case CurveTypeP256:
+	case config.CurveTypeP256:
 		privateKey, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	case CurveTypeP384:
+	case config.CurveTypeP384:
 		privateKey, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
-	case CurveTypeP521:
+	case config.CurveTypeP521:
 		privateKey, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
 	default:
 		_, privateKey, err = ed25519.GenerateKey(rand.Reader)

pkg/config/certs.go

@@ -0,0 +1,27 @@
+package config
+
+import "time"
+
+type CurveType string
+
+type File struct {
+	PublicKeyPath  string
+	PrivateKeyPath string
+}
+
+type ValidityDuration struct {
+	NotBeforeRelative time.Duration
+	NotAfterRelative  time.Duration
+}
+
+type ValidityByPurpose struct {
+	CA     ValidityDuration
+	Server ValidityDuration
+}
+
+type CertOptions struct {
+	RootCACert    File
+	CertCachePath string
+	Curve         CurveType
+	Validity      ValidityByPurpose
+}

pkg/config/config.go

@@ -0,0 +1,109 @@
+package config
+
+import (
+	"github.com/baez90/inetmock/pkg/logging"
+	"github.com/baez90/inetmock/pkg/path"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+	"strings"
+)
+
+var (
+	appConfig Config
+)
+
+func CreateConfig(flags *pflag.FlagSet) {
+	logger, _ := logging.CreateLogger()
+	configInstance := &config{
+		logger: logger.Named("Config"),
+		cfg:    viper.New(),
+	}
+
+	configInstance.cfg.SetConfigName("config")
+	configInstance.cfg.SetConfigType("yaml")
+	configInstance.cfg.AddConfigPath("/etc/inetmock/")
+	configInstance.cfg.AddConfigPath("$HOME/.inetmock")
+	configInstance.cfg.AddConfigPath(".")
+	configInstance.cfg.SetEnvPrefix("INetMock")
+	_ = configInstance.cfg.BindPFlags(flags)
+	configInstance.cfg.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
+	configInstance.cfg.AutomaticEnv()
+
+	for k, v := range registeredDefaults {
+		configInstance.cfg.SetDefault(k, v)
+	}
+
+	for k, v := range registeredAliases {
+		configInstance.cfg.RegisterAlias(k, v)
+	}
+
+	appConfig = configInstance
+}
+
+func Instance() Config {
+	return appConfig
+}
+
+type Config interface {
+	ReadConfig(configFilePath string) error
+	ReadConfigString(config, format string) error
+	Viper() *viper.Viper
+	TLSConfig() CertOptions
+	PluginsDir() string
+	EndpointConfigs() map[string]MultiHandlerConfig
+}
+
+type config struct {
+	cfg              *viper.Viper
+	logger           logging.Logger
+	TLS              CertOptions
+	PluginsDirectory string
+	Endpoints        map[string]MultiHandlerConfig
+}
+
+func (c *config) ReadConfigString(config, format string) (err error) {
+	c.cfg.SetConfigType(format)
+	if err = c.cfg.ReadConfig(strings.NewReader(config)); err != nil {
+		return
+	}
+
+	err = c.cfg.Unmarshal(c)
+	return
+}
+
+func (c *config) EndpointConfigs() map[string]MultiHandlerConfig {
+	return c.Endpoints
+}
+
+func (c *config) PluginsDir() string {
+	return c.PluginsDirectory
+}
+
+func (c *config) TLSConfig() CertOptions {
+	return c.TLS
+}
+
+func (c *config) Viper() *viper.Viper {
+	return c.cfg
+}
+
+func (c *config) ReadConfig(configFilePath string) (err error) {
+	if configFilePath != "" && path.FileExists(configFilePath) {
+		c.logger.Info(
+			"loading config from passed config file path",
+			zap.String("configFilePath", configFilePath),
+		)
+		c.cfg.SetConfigFile(configFilePath)
+	}
+	if err = c.cfg.ReadInConfig(); err != nil {
+		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+			err = nil
+			c.logger.Warn("failed to load config")
+		}
+	}
+
+	err = c.cfg.Unmarshal(c)
+
+	return
+}

pkg/config/config_test.go

@@ -0,0 +1,88 @@
+package config
+
+import (
+	"github.com/spf13/pflag"
+	"os"
+	"testing"
+)
+
+func Test_config_ReadConfig(t *testing.T) {
+	type args struct {
+		flags  *pflag.FlagSet
+		config string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		matcher func(Config) bool
+		wantErr bool
+	}{
+		{
+			name: "Test endpoints config",
+			args: args{
+				flags: pflag.NewFlagSet("", pflag.ContinueOnError),
+				config: `
+endpoints:
+  plainHttp:
+    handler: http_mock
+    listenAddress: 0.0.0.0
+    ports:
+    - 80
+    - 8080
+    options: {}
+  proxy:
+    handler: http_proxy
+    listenAddress: 0.0.0.0
+    ports:
+    - 3128
+    options:
+      target:
+        ipAddress: 127.0.0.1
+        port: 80
+`,
+			},
+			matcher: func(c Config) bool {
+				if len(c.EndpointConfigs()) < 1 {
+					t.Error("Expected EndpointConfigs to be set but is empty")
+					return false
+				}
+
+				return true
+			},
+			wantErr: false,
+		},
+		{
+			name: "Test loading of flags by adding",
+			args: args{
+				flags: func() *pflag.FlagSet {
+					flags := pflag.NewFlagSet("", pflag.ContinueOnError)
+					flags.String("plugins-directory", os.TempDir(), "")
+
+					return flags
+				}(),
+				config: ``,
+			},
+			matcher: func(c Config) bool {
+				if c.PluginsDir() != os.TempDir() {
+					t.Errorf("PluginsDir() Expected = %s, Got = %s", os.TempDir(), c.PluginsDir())
+				}
+				return true
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			CreateConfig(tt.args.flags)
+			cfg := Instance()
+			if err := cfg.ReadConfigString(tt.args.config, "yaml"); (err != nil) != tt.wantErr {
+				t.Errorf("ReadConfig() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			if !tt.matcher(cfg) {
+				t.Error("matcher error")
+			}
+		})
+	}
+}

pkg/config/constants.go

@@ -0,0 +1,12 @@
+package config
+
+const (
+	EndpointsKey = "endpoints"
+	OptionsKey   = "options"
+
+	CurveTypeP224    CurveType = "P224"
+	CurveTypeP256    CurveType = "P256"
+	CurveTypeP384    CurveType = "P384"
+	CurveTypeP521    CurveType = "P521"
+	CurveTypeED25519 CurveType = "ED25519"
+)

pkg/config/defaults.go

@@ -0,0 +1,17 @@
+package config
+
+var (
+	registeredDefaults = make(map[string]interface{})
+	// default aliases
+	registeredAliases = map[string]string{
+		"PluginsDirectory": "plugins-directory",
+	}
+)
+
+func AddDefaultValue(key string, val interface{}) {
+	registeredDefaults[key] = val
+}
+
+func AddAlias(alias, orig string) {
+	registeredAliases[alias] = orig
+}

pkg/config/handler_config.go

@@ -0,0 +1,10 @@
+package config
+
+import "github.com/spf13/viper"
+
+type HandlerConfig struct {
+	HandlerName   string
+	Port          uint16
+	ListenAddress string
+	Options       *viper.Viper
+}

pkg/config/handler_config_test.go

@@ -1,4 +1,4 @@
-package api
+package config
 
 import (
 	"github.com/spf13/viper"
@@ -19,12 +19,12 @@ func Test_handlerConfig_HandlerName(t *testing.T) {
 		want   string
 	}{
 		{
-			name:   "Get empty HandlerName for uninitialized struct",
+			name:   "Get empty Handler for uninitialized struct",
 			fields: fields{},
 			want:   "",
 		},
 		{
-			name: "Get expected HandlerName for initialized struct",
+			name: "Get expected Handler for initialized struct",
 			fields: fields{
 				handlerName: "sampleHandler",
 			},
@@ -33,14 +33,14 @@ func Test_handlerConfig_HandlerName(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			h := handlerConfig{
+			h := HandlerConfig{
-				handlerName:   tt.fields.handlerName,
+				HandlerName:   tt.fields.handlerName,
-				port:          tt.fields.port,
+				Port:          tt.fields.port,
-				listenAddress: tt.fields.listenAddress,
+				ListenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
+				Options:       tt.fields.options,
 			}
-			if got := h.HandlerName(); got != tt.want {
+			if got := h.HandlerName; got != tt.want {
-				t.Errorf("HandlerName() = %v, want %v", got, tt.want)
+				t.Errorf("Handler() = %v, want %v", got, tt.want)
 			}
 		})
 	}
@@ -73,13 +73,13 @@ func Test_handlerConfig_ListenAddress(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			h := handlerConfig{
+			h := HandlerConfig{
-				handlerName:   tt.fields.handlerName,
+				HandlerName:   tt.fields.handlerName,
-				port:          tt.fields.port,
+				Port:          tt.fields.port,
-				listenAddress: tt.fields.listenAddress,
+				ListenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
+				Options:       tt.fields.options,
 			}
-			if got := h.ListenAddress(); got != tt.want {
+			if got := h.ListenAddress; got != tt.want {
 				t.Errorf("ListenAddress() = %v, want %v", got, tt.want)
 			}
 		})
@@ -113,13 +113,13 @@ func Test_handlerConfig_Options(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			h := handlerConfig{
+			h := HandlerConfig{
-				handlerName:   tt.fields.handlerName,
+				HandlerName:   tt.fields.handlerName,
-				port:          tt.fields.port,
+				Port:          tt.fields.port,
-				listenAddress: tt.fields.listenAddress,
+				ListenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
+				Options:       tt.fields.options,
 			}
-			if got := h.Options(); !reflect.DeepEqual(got, tt.want) {
+			if got := h.Options; !reflect.DeepEqual(got, tt.want) {
 				t.Errorf("Options() = %v, want %v", got, tt.want)
 			}
 		})
@@ -153,13 +153,13 @@ func Test_handlerConfig_Port(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			h := handlerConfig{
+			h := HandlerConfig{
-				handlerName:   tt.fields.handlerName,
+				HandlerName:   tt.fields.handlerName,
-				port:          tt.fields.port,
+				Port:          tt.fields.port,
-				listenAddress: tt.fields.listenAddress,
+				ListenAddress: tt.fields.listenAddress,
-				options:       tt.fields.options,
+				Options:       tt.fields.options,
 			}
-			if got := h.Port(); got != tt.want {
+			if got := h.Port; got != tt.want {
 				t.Errorf("Port() = %v, want %v", got, tt.want)
 			}
 		})

pkg/config/multi_handler_config.go

@@ -0,0 +1,25 @@
+package config
+
+import (
+	"github.com/spf13/viper"
+)
+
+type MultiHandlerConfig struct {
+	Handler       string
+	Ports         []uint16
+	ListenAddress string
+	Options       *viper.Viper
+}
+
+func (m MultiHandlerConfig) HandlerConfigs() []HandlerConfig {
+	configs := make([]HandlerConfig, 0)
+	for _, port := range m.Ports {
+		configs = append(configs, HandlerConfig{
+			HandlerName:   m.Handler,
+			Port:          port,
+			ListenAddress: m.ListenAddress,
+			Options:       m.Options,
+		})
+	}
+	return configs
+}

plugins/dns_mock/main.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"github.com/baez90/inetmock/pkg/api"
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
 	"github.com/miekg/dns"
 	"go.uber.org/zap"
@@ -13,9 +13,9 @@ type dnsHandler struct {
 	dnsServer []*dns.Server
 }
 
-func (d *dnsHandler) Start(config api.HandlerConfig) (err error) {
+func (d *dnsHandler) Start(config config.HandlerConfig) (err error) {
-	options := loadFromConfig(config.Options())
+	options := loadFromConfig(config.Options)
-	addr := fmt.Sprintf("%s:%d", config.ListenAddress(), config.Port())
+	addr := fmt.Sprintf("%s:%d", config.ListenAddress, config.Port)
 
 	handler := &regexHandler{
 		fallback: options.Fallback,

plugins/http_mock/main.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"github.com/baez90/inetmock/pkg/api"
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
 	"go.uber.org/zap"
 	"net/http"
@@ -18,9 +18,9 @@ type httpHandler struct {
 	server *http.Server
 }
 
-func (p *httpHandler) Start(config api.HandlerConfig) (err error) {
+func (p *httpHandler) Start(config config.HandlerConfig) (err error) {
-	options := loadFromConfig(config.Options())
+	options := loadFromConfig(config.Options)
-	addr := fmt.Sprintf("%s:%d", config.ListenAddress(), config.Port())
+	addr := fmt.Sprintf("%s:%d", config.ListenAddress, config.Port)
 	p.server = &http.Server{Addr: addr, Handler: p.router}
 	p.logger = p.logger.With(
 		zap.String("address", addr),

plugins/http_proxy/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"github.com/baez90/inetmock/pkg/api"
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
 	"go.uber.org/zap"
 	"gopkg.in/elazarl/goproxy.v1"
@@ -19,9 +20,9 @@ type httpProxy struct {
 	server *http.Server
 }
 
-func (h *httpProxy) Start(config api.HandlerConfig) (err error) {
+func (h *httpProxy) Start(config config.HandlerConfig) (err error) {
-	options := loadFromConfig(config.Options())
+	options := loadFromConfig(config.Options)
-	addr := fmt.Sprintf("%s:%d", config.ListenAddress(), config.Port())
+	addr := fmt.Sprintf("%s:%d", config.ListenAddress, config.Port)
 	h.server = &http.Server{Addr: addr, Handler: h.proxy}
 	h.logger = h.logger.With(
 		zap.String("address", addr),

plugins/tls_interceptor/main.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"github.com/baez90/inetmock/pkg/api"
 	"github.com/baez90/inetmock/pkg/cert"
+	"github.com/baez90/inetmock/pkg/config"
 	"github.com/baez90/inetmock/pkg/logging"
 	"github.com/google/uuid"
 	"go.uber.org/zap"
@@ -27,9 +28,9 @@ type tlsInterceptor struct {
 	currentConnections      map[uuid.UUID]*proxyConn
 }
 
-func (t *tlsInterceptor) Start(config api.HandlerConfig) (err error) {
+func (t *tlsInterceptor) Start(config config.HandlerConfig) (err error) {
-	t.options = loadFromConfig(config.Options())
+	t.options = loadFromConfig(config.Options)
-	addr := fmt.Sprintf("%s:%d", config.ListenAddress(), config.Port())
+	addr := fmt.Sprintf("%s:%d", config.ListenAddress, config.Port)
 
 	t.logger = t.logger.With(
 		zap.String("address", addr),

proxy_config.yaml

@@ -1,77 +0,0 @@
-endpoints:
-  plainHttp:
-    handler: http_proxy
-    listenAddress: 0.0.0.0
-    port: 80
-    options:
-      rules:
-        - pattern: ".*\\.(?i)exe"
-          response: ./assets/fakeFiles/sample.exe
-        - pattern: ".*\\.(?i)(jpg|jpeg)"
-          response: ./assets/fakeFiles/default.jpg
-        - pattern: ".*\\.(?i)png"
-          response: ./assets/fakeFiles/default.png
-        - pattern: ".*\\.(?i)gif"
-          response: ./assets/fakeFiles/default.gif
-        - pattern: ".*\\.(?i)ico"
-          response: ./assets/fakeFiles/default.ico
-        - pattern: ".*\\.(?i)txt"
-          response: ./assets/fakeFiles/default.txt
-        - pattern: ".*"
-          response: ./assets/fakeFiles/default.html
-  httpsDowngrade:
-    handler: tls_interceptor
-    listenAddress: 0.0.0.0
-    port: 443
-    options:
-      ecdsaCurve: P256
-      validity:
-        ca:
-          notBeforeRelative: 17520h
-          notAfterRelative: 17520h
-        domain:
-          notBeforeRelative: 168h
-          notAfterRelative: 168h
-      rootCaCert:
-        publicKey: ./ca.pem
-        privateKey: ./ca.key
-      certCachePath: /tmp/inetmock/
-      target:
-        ipAddress: 127.0.0.1
-        port: 80
-  plainDns:
-    handler: dns_mock
-    listenAddress: 0.0.0.0
-    port: 53
-    options:
-      rules:
-        - pattern: "www.golem.de"
-          response: 77.247.84.129
-        - pattern: ".*\\.google\\.com"
-          response: 1.1.1.1
-        - pattern: ".*\\.reddit\\.com"
-          response: 2.2.2.2
-      fallback:
-        strategy: incremental
-        args:
-          startIP: 10.0.0.0
-  dnsOverTlsDowngrade:
-    handler: tls_interceptor
-    listenAddress: 0.0.0.0
-    port: 853
-    options:
-      ecdsaCurve: P256
-      validity:
-        ca:
-          notBeforeRelative: 17520h
-          notAfterRelative: 17520h
-        domain:
-          notBeforeRelative: 168h
-          notAfterRelative: 168h
-      rootCaCert:
-        publicKey: ./ca.pem
-        privateKey: ./ca.key
-      certCachePath: /tmp/inetmock/
-      target:
-        ipAddress: 127.0.0.1
-        port: 53