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Allow using config file as well as env variables #18

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faercol merged 1 commit from feat/improve-config into main 2024-08-10 13:52:26 +00:00
Conversation 0 Commits 1 Files changed 7 +229 -180
7 changed files with 229 additions and 180 deletions
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Showing only changes of commit 0fc6a4b093 - Show all commits

28
.envrc
View file

@ -1,18 +1,18 @@
# Can be debug,info,warning,error # Can be debug,info,warning,error
export LOG_LEVEL=debug export POLYCULECONNECT_LOG_LEVEL=debug
# Can be net,unix # Can be net,unix
export SERVER_MODE=net export POLYCULECONNECT_SERVER_MODE=net
export SERVER_HOST="0.0.0.0" export POLYCULECONNECT_SERVER_HOST="0.0.0.0"
export SERVER_PORT="5000" export POLYCULECONNECT_SERVER_PORT="5000"
# SERVER_SOCK_PATH = "" # POLYCULECONNECT_SERVER_SOCK_PATH = ""
export STORAGE_TYPE="sqlite" export POLYCULECONNECT_STORAGE_TYPE="sqlite"
export STORAGE_FILEPATH="./build/polyculeconnect.db" export POLYCULECONNECT_STORAGE_FILEPATH="./build/polyculeconnect.db"
# STORAGE_HOST = "127.0.0.1" # POLYCULECONNECT_STORAGE_HOST = "127.0.0.1"
# STORAGE_PORT = "5432" # POLYCULECONNECT_STORAGE_PORT = "5432"
# STORAGE_DB = "polyculeconnect" # POLYCULECONNECT_STORAGE_DB = "polyculeconnect"
# STORAGE_USER = "polyculeconnect" # POLYCULECONNECT_STORAGE_USER = "polyculeconnect"
# STORAGE_PASSWORD = "polyculeconnect" # POLYCULECONNECT_STORAGE_PASSWORD = "polyculeconnect"
# STORAGE_SSL_MODE = "disable" # POLYCULECONNECT_STORAGE_SSL_MODE = "disable"
# STORAGE_SSL_CA_FILE = "" # POLYCULECONNECT_STORAGE_SSL_CA_FILE = ""

16
polyculeconnect/cmd/serve/serve.go
View file

@ -47,7 +47,7 @@ func serve() {
Theme: "default", Theme: "default",
}, },
Storage: storageType, Storage: storageType,
Issuer: conf.OpenConnectConfig.Issuer, Issuer: conf.Issuer,
SupportedResponseTypes: []string{"code"}, SupportedResponseTypes: []string{"code"},
SkipApprovalScreen: false, SkipApprovalScreen: false,
AllowedOrigins: []string{"*"}, AllowedOrigins: []string{"*"},
@ -71,20 +71,6 @@ func serve() {
logger.L.Errorf("Failed to add connector for backend RefuseAll to stage: %s", err.Error()) logger.L.Errorf("Failed to add connector for backend RefuseAll to stage: %s", err.Error())
} }
for _, backend := range conf.OpenConnectConfig.BackendConfigs {
if err := services.CreateConnector(backend, &dexConf, connectorIDs); err != nil {
logger.L.Errorf("Failed to add connector for backend %q to stage: %s", backend.Name, err.Error())
continue
}
}
logger.L.Info("Initializing clients")
for _, client := range conf.OpenConnectConfig.ClientConfigs {
if err := dexConf.Storage.CreateClient(*client); err != nil {
logger.L.Errorf("Failed to add client to storage: %s", err.Error())
}
}
dexSrv, err := dex_server.NewServer(mainCtx, dexConf) dexSrv, err := dex_server.NewServer(mainCtx, dexConf)
if err != nil { if err != nil {
logger.L.Fatalf("Failed to init dex server: %s", err.Error()) logger.L.Fatalf("Failed to init dex server: %s", err.Error())

193
polyculeconnect/config/config.go
View file

@ -8,32 +8,13 @@ import (
"os" "os"
"github.com/dexidp/dex/connector/oidc" "github.com/dexidp/dex/connector/oidc"
"github.com/dexidp/dex/storage" "github.com/kelseyhightower/envconfig"
"github.com/sirupsen/logrus" "github.com/sirupsen/logrus"
) )
type envVar string
const ( const (
varLogLevel envVar = "LOG_LEVEL" envConfigPrefix = "POLYCULECONNECT"
DefaultConfigPath = "/etc/polyculeconnect.json"
varServerMode envVar = "SERVER_MODE"
varServerHost envVar = "SERVER_HOST"
varServerPort envVar = "SERVER_PORT"
varServerSocket envVar = "SERVER_SOCK_PATH"
varServerStaticDir envVar = "SERVER_STATIC_DIR"
varIssuer envVar = "ISSUER"
varStorageType envVar = "STORAGE_TYPE"
varStorageFile envVar = "STORAGE_FILEPATH"
varStorageHost envVar = "STORAGE_HOST"
varStoragePort envVar = "STORAGE_PORT"
varStorageDB envVar = "STORAGE_DB"
varStorageUser envVar = "STORAGE_USER"
varStoragePassword envVar = "STORAGE_PASSWORD"
varStorageSSLMode envVar = "STORAGE_SSL_MODE"
varStorageSSLCaFile envVar = "STORAGE_SSL_CA_FILE"
) )
type ListeningMode string type ListeningMode string
@ -81,42 +62,106 @@ type BackendConfig struct {
Local bool `json:"local"` Local bool `json:"local"`
} }
// Deprecated: remove when we finally drop the JSON config type SSLStorageConfig struct {
type OpenConnectConfig struct { Mode string `json:"mode" envconfig:"STORAGE_SSL_MODE"`
ClientConfigs []*storage.Client `json:"clients"` CaFile string `json:"ca_file" envconfig:"STORAGE_SSL_CA_FILE"`
BackendConfigs []*BackendConfig `json:"backends"`
Issuer string `json:"issuer"`
} }
type StorageConfig struct { type StorageConfig struct {
File string File string `envconfig:"STORAGE_PATH"`
Host string Host string `envconfig:"STORAGE_HOST"`
Port int Port int `envconfig:"STORAGE_PORT"`
Database string Database string `envconfig:"STORAGE_DATABASE"`
User string User string `envconfig:"STORAGE_USER"`
Password string Password string `envconfig:"STORAGE_PASSWORD"`
Ssl struct { SSL SSLStorageConfig
Mode string
CaFile string
} }
type logConfig struct {
Level string `json:"level"`
}
type serverConfig struct {
Mode string `json:"mode"`
Host string `json:"host"`
Port int `json:"port"`
Sock string `json:"sock"`
}
type jsonStorageConfig struct {
Type string `json:"type"`
File string `json:"path"`
Host string `json:"host" `
Port int `json:"port"`
Database string `json:"database" `
User string `json:"user" `
Password string `json:"password" `
SSL SSLStorageConfig `json:"ssl"`
} }
type jsonConf struct { type jsonConf struct {
OpenConnectConfig *OpenConnectConfig `json:"openconnect"` LogConfig logConfig `json:"log"`
ServerConfig serverConfig `json:"server"`
StorageConfig jsonStorageConfig `json:"storage"`
}
func (c *jsonConf) initValues(ac *AppConfig) {
c.LogConfig = logConfig{Level: ac.LogLevel.String()}
c.ServerConfig = serverConfig{
Mode: string(ac.ServerMode),
Host: ac.Host,
Port: ac.Port,
Sock: ac.SockPath,
}
c.StorageConfig = jsonStorageConfig{
Type: ac.StorageType,
File: ac.StorageConfig.File,
Host: ac.StorageConfig.Host,
Port: ac.StorageConfig.Port,
Database: ac.StorageConfig.Database,
User: ac.StorageConfig.User,
Password: ac.StorageConfig.Password,
SSL: ac.StorageConfig.SSL,
}
} }
type AppConfig struct { type AppConfig struct {
LogLevel logrus.Level LogLevel logrus.Level `envconfig:"LOG_LEVEL"`
ServerMode ListeningMode ServerMode ListeningMode `envconfig:"SERVER_MODE"`
Host string Host string `envconfig:"SERVER_HOST"`
Port int Port int `envconfig:"SERVER_PORT"`
SockPath string SockPath string `envconfig:"SERVER_SOCK"`
StorageType string StorageType string `envconfig:"STORAGE_TYPE"`
StorageConfig *StorageConfig StorageConfig *StorageConfig
OpenConnectConfig *OpenConnectConfig Issuer string
StaticDir string StaticDir string
} }
func defaultConfig() AppConfig {
return AppConfig{
LogLevel: defaultLogLevel,
ServerMode: defaultServerMode,
Host: defaultServerHost,
Port: defaultServerPort,
SockPath: defaultServerSocket,
StorageType: string(defaultStorageType),
StorageConfig: &StorageConfig{
File: defaultStorageFile,
Host: defaultStorageHost,
Port: defaultServerPort,
Database: defaultStorageDB,
User: defaultStorageUser,
Password: defaultStoragePassword,
SSL: SSLStorageConfig{
Mode: defaultStorageSSLMode,
CaFile: defaultStorageSSLCaFile,
},
},
Issuer: defaultIssuer,
StaticDir: defaultServerStaticDir,
}
}
func parseLevel(lvlStr string) logrus.Level { func parseLevel(lvlStr string) logrus.Level {
for _, lvl := range logrus.AllLevels { for _, lvl := range logrus.AllLevels {
if lvl.String() == lvlStr { if lvl.String() == lvlStr {
@ -128,46 +173,36 @@ func parseLevel(lvlStr string) logrus.Level {
func (ac *AppConfig) UnmarshalJSON(data []byte) error { func (ac *AppConfig) UnmarshalJSON(data []byte) error {
var jsonConf jsonConf var jsonConf jsonConf
jsonConf.initValues(ac)
if err := json.Unmarshal(data, &jsonConf); err != nil { if err := json.Unmarshal(data, &jsonConf); err != nil {
return fmt.Errorf("failed to read JSON: %w", err) return fmt.Errorf("failed to read JSON: %w", err)
} }
ac.OpenConnectConfig = jsonConf.OpenConnectConfig
if ac.OpenConnectConfig == nil { ac.LogLevel = parseLevel(jsonConf.LogConfig.Level)
ac.OpenConnectConfig = &OpenConnectConfig{}
} ac.ServerMode = ListeningMode(jsonConf.ServerConfig.Mode)
ac.Host = jsonConf.ServerConfig.Host
ac.Port = jsonConf.ServerConfig.Port
ac.SockPath = jsonConf.ServerConfig.Sock
ac.StorageType = jsonConf.StorageConfig.Type
ac.StorageConfig.File = jsonConf.StorageConfig.File
ac.StorageConfig.Host = jsonConf.StorageConfig.Host
ac.StorageConfig.Port = jsonConf.StorageConfig.Port
ac.StorageConfig.Database = jsonConf.StorageConfig.Database
ac.StorageConfig.User = jsonConf.StorageConfig.User
ac.StorageConfig.Password = jsonConf.StorageConfig.Password
ac.StorageConfig.SSL = jsonConf.StorageConfig.SSL
return nil return nil
} }
func (ac *AppConfig) getConfFromEnv() {
ac.LogLevel = parseLevel(getStringFromEnv(varLogLevel, defaultLogLevel.String()))
ac.ServerMode = ListeningMode(getStringFromEnv(varServerMode, string(defaultServerMode)))
ac.Host = getStringFromEnv(varServerHost, defaultServerHost)
ac.Port = getIntFromEnv(varServerPort, defaultServerPort)
ac.SockPath = getStringFromEnv(varServerSocket, defaultServerSocket)
ac.StaticDir = getStringFromEnv(varServerStaticDir, defaultServerStaticDir)
ac.StorageType = getStringFromEnv(varStorageType, string(defaultStorageType))
ac.StorageConfig.Database = getStringFromEnv(varStorageDB, defaultStorageDB)
ac.StorageConfig.File = getStringFromEnv(varStorageFile, defaultStorageFile)
ac.StorageConfig.Host = getStringFromEnv(varStorageHost, defaultStorageHost)
ac.StorageConfig.Port = getIntFromEnv(varStoragePort, defaultStoragePort)
ac.StorageConfig.User = getStringFromEnv(varStorageUser, defaultStorageUser)
ac.StorageConfig.Password = getStringFromEnv(varStoragePassword, defaultStoragePassword)
ac.StorageConfig.Ssl.CaFile = getStringFromEnv(varStorageSSLCaFile, defaultStorageSSLCaFile)
ac.StorageConfig.Ssl.Mode = getStringFromEnv(varStorageSSLMode, defaultStorageSSLMode)
ac.OpenConnectConfig.Issuer = getStringFromEnv(varIssuer, defaultIssuer)
}
func (ac *AppConfig) RedirectURI() string { func (ac *AppConfig) RedirectURI() string {
return ac.OpenConnectConfig.Issuer + "/callback" return ac.Issuer + "/callback"
} }
func New(filepath string) (*AppConfig, error) { func New(filepath string) (*AppConfig, error) {
var conf AppConfig conf := defaultConfig()
conf.StorageConfig = &StorageConfig{}
conf.OpenConnectConfig = &OpenConnectConfig{}
content, err := os.ReadFile(filepath) content, err := os.ReadFile(filepath)
if err != nil { if err != nil {
if !errors.Is(err, fs.ErrNotExist) { if !errors.Is(err, fs.ErrNotExist) {
@ -178,6 +213,14 @@ func New(filepath string) (*AppConfig, error) {
return nil, fmt.Errorf("failed to parse config file: %w", err) return nil, fmt.Errorf("failed to parse config file: %w", err)
} }
} }
conf.getConfFromEnv() if err := envconfig.Process(envConfigPrefix, &conf); err != nil {
return nil, err
}
if err := envconfig.Process(envConfigPrefix, conf.StorageConfig); err != nil {
return nil, err
}
if err := envconfig.Process(envConfigPrefix, &conf.StorageConfig.SSL); err != nil {
return nil, err
}
return &conf, nil return &conf, nil
} }

137
polyculeconnect/config/config_test.go
View file

@ -10,31 +10,6 @@ import (
"github.com/stretchr/testify/require" "github.com/stretchr/testify/require"
) )
var defaultConfig = AppConfig{
LogLevel: defaultLogLevel,
ServerMode: defaultServerMode,
Host: defaultServerHost,
Port: defaultServerPort,
SockPath: defaultServerSocket,
StorageType: string(defaultStorageType),
StaticDir: "./",
StorageConfig: &StorageConfig{
File: defaultStorageFile,
Host: defaultStorageHost,
Port: defaultStoragePort,
Database: defaultStorageDB,
User: defaultStorageUser,
Password: defaultStoragePassword,
Ssl: struct {
Mode string
CaFile string
}{Mode: defaultStorageSSLMode, CaFile: defaultStorageSSLCaFile},
},
OpenConnectConfig: &OpenConnectConfig{
Issuer: defaultIssuer,
},
}
func initJson(t *testing.T, content string) string { func initJson(t *testing.T, content string) string {
tmpPath := t.TempDir() tmpPath := t.TempDir()
confPath := path.Join(tmpPath, "config.json") confPath := path.Join(tmpPath, "config.json")
@ -53,14 +28,14 @@ func TestDefault(t *testing.T) {
t.Run("no file", func(t *testing.T) { t.Run("no file", func(t *testing.T) {
conf, err := New("/this/path/does/not/exist") conf, err := New("/this/path/does/not/exist")
require.NoError(t, err) require.NoError(t, err)
assert.Equal(t, defaultConfig, *conf) assert.Equal(t, defaultConfig(), *conf)
}) })
t.Run("empty config", func(t *testing.T) { t.Run("empty config", func(t *testing.T) {
confPath := initJson(t, `{}`) confPath := initJson(t, `{}`)
conf, err := New(confPath) conf, err := New(confPath)
require.NoError(t, err) require.NoError(t, err)
assert.Equal(t, defaultConfig, *conf) assert.Equal(t, defaultConfig(), *conf)
}) })
} }
@ -73,11 +48,54 @@ func TestInvalidJSON(t *testing.T) {
assert.ErrorContains(t, err, errMsg) assert.ErrorContains(t, err, errMsg)
} }
func TestJSONConfig(t *testing.T) {
confPath := initJson(t, `{
"log": {"level":"info"},
"server": {
"mode": "net",
"host": "0.0.0.0",
"port": 1337
}
}`)
conf, err := New(confPath)
require.NoError(t, err)
assert.Equal(t, ModeNet, conf.ServerMode)
assert.Equal(t, "0.0.0.0", conf.Host)
assert.Equal(t, 1337, conf.Port)
}
func TestJSONConfigOverriden(t *testing.T) {
confPath := initJson(t, `{
"log": {"level":"info"},
"server": {
"mode": "net",
"host": "0.0.0.0",
"port": 1337
}
}`)
envVars := map[string]string{
string("POLYCULECONNECT_SERVER_MODE"): string(ModeUnix),
string("POLYCULECONNECT_SERVER_SOCK"): "/run/polyculeconnect.sock",
}
setEnv(t, envVars)
conf, err := New(confPath)
require.NoError(t, err)
assert.Equal(t, ModeUnix, conf.ServerMode)
assert.Equal(t, "0.0.0.0", conf.Host)
assert.Equal(t, 1337, conf.Port)
assert.Equal(t, "/run/polyculeconnect.sock", conf.SockPath)
}
func TestHostNetMode(t *testing.T) { func TestHostNetMode(t *testing.T) {
envVars := map[string]string{ envVars := map[string]string{
string(varServerMode): string(ModeNet), string("POLYCULECONNECT_SERVER_MODE"): string(ModeNet),
string(varServerHost): "127.0.0.1", string("POLYCULECONNECT_SERVER_HOST"): "127.0.0.1",
string(varServerPort): "8888", string("POLYCULECONNECT_SERVER_PORT"): "8888",
} }
setEnv(t, envVars) setEnv(t, envVars)
@ -91,8 +109,8 @@ func TestHostNetMode(t *testing.T) {
func TestHostSocketMode(t *testing.T) { func TestHostSocketMode(t *testing.T) {
envVars := map[string]string{ envVars := map[string]string{
string(varServerMode): string(ModeUnix), string("POLYCULECONNECT_SERVER_MODE"): string(ModeUnix),
string(varServerSocket): "/run/polyculeconnect.sock", string("POLYCULECONNECT_SERVER_SOCK"): "/run/polyculeconnect.sock",
} }
setEnv(t, envVars) setEnv(t, envVars)
@ -105,7 +123,7 @@ func TestHostSocketMode(t *testing.T) {
func TestLogLevel(t *testing.T) { func TestLogLevel(t *testing.T) {
envVars := map[string]string{ envVars := map[string]string{
string(varLogLevel): "error", string("POLYCULECONNECT_LOG_LEVEL"): "error",
} }
setEnv(t, envVars) setEnv(t, envVars)
@ -115,22 +133,10 @@ func TestLogLevel(t *testing.T) {
assert.Equal(t, logrus.ErrorLevel, conf.LogLevel) assert.Equal(t, logrus.ErrorLevel, conf.LogLevel)
} }
func TestLogLevelInvalidValue(t *testing.T) {
envVars := map[string]string{
string(varLogLevel): "toto",
}
setEnv(t, envVars)
conf, err := New("")
require.NoError(t, err)
assert.Equal(t, logrus.InfoLevel, conf.LogLevel) // if invalid, no error should occur, but info level should be used
}
func TestSqliteConfig(t *testing.T) { func TestSqliteConfig(t *testing.T) {
envVars := map[string]string{ envVars := map[string]string{
string(varStorageType): "sqlite", string("POLYCULECONNECT_STORAGE_TYPE"): "sqlite",
string(varStorageFile): "/data/polyculeconnect.db", string("POLYCULECONNECT_STORAGE_PATH"): "/data/polyculeconnect.db",
} }
setEnv(t, envVars) setEnv(t, envVars)
@ -140,3 +146,40 @@ func TestSqliteConfig(t *testing.T) {
assert.Equal(t, string(SQLite), conf.StorageType) assert.Equal(t, string(SQLite), conf.StorageType)
assert.Equal(t, "/data/polyculeconnect.db", conf.StorageConfig.File) assert.Equal(t, "/data/polyculeconnect.db", conf.StorageConfig.File)
} }
func TestSqliteConfigJSON(t *testing.T) {
confPath := initJson(t, `{
"log": {"level":"info"},
"storage": {
"type": "sqlite",
"path": "/data/polyculeconnect.db"
}
}`)
conf, err := New(confPath)
require.NoError(t, err)
assert.Equal(t, string(SQLite), conf.StorageType)
assert.Equal(t, "/data/polyculeconnect.db", conf.StorageConfig.File)
}
func TestSqliteConfigJSONOverriden(t *testing.T) {
confPath := initJson(t, `{
"log": {"level":"info"},
"storage": {
"type": "sqlite",
"path": "/data/polyculeconnect.db"
}
}`)
envVars := map[string]string{
string("POLYCULECONNECT_STORAGE_PATH"): "/tmp/polyculeconnect.db",
}
setEnv(t, envVars)
conf, err := New(confPath)
require.NoError(t, err)
assert.Equal(t, string(SQLite), conf.StorageType)
assert.Equal(t, "/tmp/polyculeconnect.db", conf.StorageConfig.File)
}

26
polyculeconnect/config/envvar.go
View file

@ -1,26 +0,0 @@
package config
import (
"os"
"strconv"
)
func getStringFromEnv(key envVar, defaultValue string) string {
val, ok := os.LookupEnv(string(key))
if !ok {
return defaultValue
}
return val
}
func getIntFromEnv(key envVar, defaultValue int) int {
rawVal, ok := os.LookupEnv(string(key))
if !ok {
return defaultValue
}
val, err := strconv.Atoi(rawVal)
if err != nil {
return defaultValue
}
return val
}

1
polyculeconnect/go.mod
View file

@ -4,6 +4,7 @@ go 1.20
require ( require (
github.com/dexidp/dex v0.0.0-20231014000322-089f374d4f3e github.com/dexidp/dex v0.0.0-20231014000322-089f374d4f3e
github.com/kelseyhightower/envconfig v1.4.0
github.com/prometheus/client_golang v1.17.0 github.com/prometheus/client_golang v1.17.0
github.com/sirupsen/logrus v1.9.3 github.com/sirupsen/logrus v1.9.3
github.com/spf13/cobra v1.7.0 github.com/spf13/cobra v1.7.0

2
polyculeconnect/go.sum
View file

@ -102,6 +102,8 @@ github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2
github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw= github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
github.com/jonboulle/clockwork v0.2.2 h1:UOGuzwb1PwsrDAObMuhUnj0p5ULPj8V/xJ7Kx9qUBdQ= github.com/jonboulle/clockwork v0.2.2 h1:UOGuzwb1PwsrDAObMuhUnj0p5ULPj8V/xJ7Kx9qUBdQ=
github.com/jonboulle/clockwork v0.2.2/go.mod h1:Pkfl5aHPm1nk2H9h0bjmnJD/BcgbGXUBGnn1kMkgxc8= github.com/jonboulle/clockwork v0.2.2/go.mod h1:Pkfl5aHPm1nk2H9h0bjmnJD/BcgbGXUBGnn1kMkgxc8=
github.com/kelseyhightower/envconfig v1.4.0 h1:Im6hONhd3pLkfDFsbRgu68RDNkGF1r3dvMUtDTo2cv8=
github.com/kelseyhightower/envconfig v1.4.0/go.mod h1:cccZRl6mQpaq41TPp5QxidR+Sa3axMbJDNb//FQX6Gg=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo= github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI= github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk= github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=