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viper_test.go
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// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package viper
import (
"bytes"
"encoding/json"
"io"
"os"
"os/exec"
"path"
"path/filepath"
"reflect"
"runtime"
"strings"
"sync"
"testing"
"time"
"github.com/fsnotify/fsnotify"
"github.com/go-viper/mapstructure/v2"
"github.com/sagikazarmark/locafero"
"github.com/spf13/afero"
"github.com/spf13/cast"
"github.com/spf13/pflag"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/spf13/viper/internal/testutil"
)
// var yamlExample = []byte(`Hacker: true
// name: steve
// hobbies:
// - skateboarding
// - snowboarding
// - go
// clothing:
// jacket: leather
// trousers: denim
// pants:
// size: large
// age: 35
// eyes : brown
// beard: true
// `)
var yamlExampleWithExtras = []byte(`Existing: true
Bogus: true
`)
type testUnmarshalExtra struct {
Existing bool
}
var tomlExample = []byte(`
title = "TOML Example"
[owner]
organization = "MongoDB"
Bio = "MongoDB Chief Developer Advocate & Hacker at Large"
dob = 1979-05-27T07:32:00Z # First class dates? Why not?`)
var dotenvExample = []byte(`
TITLE_DOTENV="DotEnv Example"
TYPE_DOTENV=donut
NAME_DOTENV=Cake`)
var jsonExample = []byte(`{
"id": "0001",
"type": "donut",
"name": "Cake",
"ppu": 0.55,
"batters": {
"batter": [
{ "type": "Regular" },
{ "type": "Chocolate" },
{ "type": "Blueberry" },
{ "type": "Devil's Food" }
]
}
}`)
var remoteExample = []byte(`{
"id":"0002",
"type":"cronut",
"newkey":"remote"
}`)
func initConfigs(v *Viper) {
var r io.Reader
v.SetConfigType("yaml")
r = bytes.NewReader(yamlExample)
v.unmarshalReader(r, v.config)
v.SetConfigType("json")
r = bytes.NewReader(jsonExample)
v.unmarshalReader(r, v.config)
v.SetConfigType("toml")
r = bytes.NewReader(tomlExample)
v.unmarshalReader(r, v.config)
v.SetConfigType("env")
r = bytes.NewReader(dotenvExample)
v.unmarshalReader(r, v.config)
v.SetConfigType("json")
remote := bytes.NewReader(remoteExample)
v.unmarshalReader(remote, v.kvstore)
}
func initConfig(typ, config string, v *Viper) {
v.SetConfigType(typ)
r := strings.NewReader(config)
if err := v.unmarshalReader(r, v.config); err != nil {
panic(err)
}
}
// initDirs makes directories for testing.
func initDirs(t *testing.T) (string, string) {
var (
testDirs = []string{`a a`, `b`, `C_`}
config = `improbable`
)
if runtime.GOOS != "windows" {
testDirs = append(testDirs, `d\d`)
}
root := t.TempDir()
for _, dir := range testDirs {
innerDir := filepath.Join(root, dir)
err := os.Mkdir(innerDir, 0o750)
require.NoError(t, err)
err = os.WriteFile(
filepath.Join(innerDir, config+".toml"),
[]byte(`key = "value is `+dir+`"`+"\n"),
0o640)
require.NoError(t, err)
}
return root, config
}
// stubs for PFlag Values.
type stringValue string
func newStringValue(val string, p *string) *stringValue {
*p = val
return (*stringValue)(p)
}
func (s *stringValue) Set(val string) error {
*s = stringValue(val)
return nil
}
func (s *stringValue) Type() string {
return "string"
}
func (s *stringValue) String() string {
return string(*s)
}
func TestGetConfigFile(t *testing.T) {
t.Run("config file set", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
v := New()
v.SetFs(fs)
v.AddConfigPath("/etc/viper")
v.SetConfigFile(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
filename, err := v.getConfigFile()
assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/config.yaml"), filename)
assert.NoError(t, err)
})
t.Run("find file", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
v := New()
v.SetFs(fs)
v.AddConfigPath("/etc/viper")
filename, err := v.getConfigFile()
assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/config.yaml"), filename)
assert.NoError(t, err)
})
t.Run("find files only", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/config"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/config/config.yaml"))
require.NoError(t, err)
v := New()
v.SetFs(fs)
v.AddConfigPath("/etc")
v.AddConfigPath("/etc/config")
filename, err := v.getConfigFile()
assert.Equal(t, testutil.AbsFilePath(t, "/etc/config/config.yaml"), filename)
assert.NoError(t, err)
})
t.Run("precedence", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/home/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/home/viper/config.zml"))
require.NoError(t, err)
err = fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.bml"))
require.NoError(t, err)
err = fs.Mkdir(testutil.AbsFilePath(t, "/var/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/var/viper/config.yaml"))
require.NoError(t, err)
v := New()
v.SetFs(fs)
v.AddConfigPath("/home/viper")
v.AddConfigPath("/etc/viper")
v.AddConfigPath("/var/viper")
filename, err := v.getConfigFile()
assert.Equal(t, testutil.AbsFilePath(t, "/var/viper/config.yaml"), filename)
assert.NoError(t, err)
})
t.Run("without extension", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/.dotfilenoext"))
require.NoError(t, err)
v := New()
v.SetFs(fs)
v.AddConfigPath("/etc/viper")
v.SetConfigName(".dotfilenoext")
v.SetConfigType("yaml")
filename, err := v.getConfigFile()
assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/.dotfilenoext"), filename)
assert.NoError(t, err)
})
t.Run("without extension and config type", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/.dotfilenoext"))
require.NoError(t, err)
v := New()
v.SetFs(fs)
v.AddConfigPath("/etc/viper")
v.SetConfigName(".dotfilenoext")
_, err = v.getConfigFile()
// unless config type is set, files without extension
// are not considered
assert.Error(t, err)
})
t.Run("experimental finder", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
v := NewWithOptions(ExperimentalFinder())
v.SetFs(fs)
v.AddConfigPath("/etc/viper")
filename, err := v.getConfigFile()
assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/config.yaml"), testutil.AbsFilePath(t, filename))
assert.NoError(t, err)
})
t.Run("finder", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
finder := locafero.Finder{
Paths: []string{testutil.AbsFilePath(t, "/etc/viper")},
Names: locafero.NameWithExtensions("config", SupportedExts...),
Type: locafero.FileTypeFile,
}
v := NewWithOptions(WithFinder(finder))
v.SetFs(fs)
// These should be ineffective
v.AddConfigPath("/etc/something_else")
v.SetConfigName("not-config")
filename, err := v.getConfigFile()
assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/config.yaml"), testutil.AbsFilePath(t, filename))
assert.NoError(t, err)
})
}
func TestReadInConfig(t *testing.T) {
t.Run("config file set", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir("/etc/viper", 0o777)
require.NoError(t, err)
file, err := fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
_, err = file.WriteString(`key: value`)
require.NoError(t, err)
file.Close()
v := New()
v.SetFs(fs)
v.SetConfigFile(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
err = v.ReadInConfig()
require.NoError(t, err)
assert.Equal(t, "value", v.Get("key"))
})
t.Run("find file", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
file, err := fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
_, err = file.WriteString(`key: value`)
require.NoError(t, err)
file.Close()
v := New()
v.SetFs(fs)
v.AddConfigPath("/etc/viper")
err = v.ReadInConfig()
require.NoError(t, err)
assert.Equal(t, "value", v.Get("key"))
})
t.Run("find file with experimental finder", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
file, err := fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
_, err = file.WriteString(`key: value`)
require.NoError(t, err)
file.Close()
v := NewWithOptions(ExperimentalFinder())
v.SetFs(fs)
v.AddConfigPath("/etc/viper")
err = v.ReadInConfig()
require.NoError(t, err)
assert.Equal(t, "value", v.Get("key"))
})
t.Run("find file using a finder", func(t *testing.T) {
fs := afero.NewMemMapFs()
err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
require.NoError(t, err)
file, err := fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
require.NoError(t, err)
_, err = file.WriteString(`key: value`)
require.NoError(t, err)
file.Close()
finder := locafero.Finder{
Paths: []string{testutil.AbsFilePath(t, "/etc/viper")},
Names: locafero.NameWithExtensions("config", SupportedExts...),
Type: locafero.FileTypeFile,
}
v := NewWithOptions(WithFinder(finder))
v.SetFs(fs)
// These should be ineffective
v.AddConfigPath("/etc/something_else")
v.SetConfigName("not-config")
err = v.ReadInConfig()
require.NoError(t, err)
assert.Equal(t, "value", v.Get("key"))
})
}
func TestDefault(t *testing.T) {
v := New()
v.SetDefault("age", 45)
assert.Equal(t, 45, v.Get("age"))
v.SetDefault("clothing.jacket", "slacks")
assert.Equal(t, "slacks", v.Get("clothing.jacket"))
v.SetConfigType("yaml")
err := v.ReadConfig(bytes.NewBuffer(yamlExample))
require.NoError(t, err)
assert.Equal(t, "leather", v.Get("clothing.jacket"))
}
func TestUnmarshaling(t *testing.T) {
v := New()
v.SetConfigType("yaml")
r := bytes.NewReader(yamlExample)
v.unmarshalReader(r, v.config)
assert.True(t, v.InConfig("name"))
assert.True(t, v.InConfig("clothing.jacket"))
assert.False(t, v.InConfig("state"))
assert.False(t, v.InConfig("clothing.hat"))
assert.Equal(t, "steve", v.Get("name"))
assert.Equal(t, []any{"skateboarding", "snowboarding", "go"}, v.Get("hobbies"))
assert.Equal(t, map[string]any{"jacket": "leather", "trousers": "denim", "pants": map[string]any{"size": "large"}}, v.Get("clothing"))
assert.Equal(t, 35, v.Get("age"))
}
func TestUnmarshalExact(t *testing.T) {
v := New()
target := &testUnmarshalExtra{}
v.SetConfigType("yaml")
r := bytes.NewReader(yamlExampleWithExtras)
v.ReadConfig(r)
err := v.UnmarshalExact(target)
assert.Error(t, err, "UnmarshalExact should error when populating a struct from a conf that contains unused fields")
}
func TestOverrides(t *testing.T) {
v := New()
v.Set("age", 40)
assert.Equal(t, 40, v.Get("age"))
}
func TestDefaultPost(t *testing.T) {
v := New()
assert.NotEqual(t, "NYC", v.Get("state"))
v.SetDefault("state", "NYC")
assert.Equal(t, "NYC", v.Get("state"))
}
func TestAliases(t *testing.T) {
v := New()
v.Set("age", 40)
v.RegisterAlias("years", "age")
assert.Equal(t, 40, v.Get("years"))
v.Set("years", 45)
assert.Equal(t, 45, v.Get("age"))
}
func TestAliasInConfigFile(t *testing.T) {
v := New()
v.SetConfigType("yaml")
// Read the YAML data into Viper configuration
require.NoError(t, v.ReadConfig(bytes.NewBuffer(yamlExample)), "Error reading YAML data")
v.RegisterAlias("beard", "hasbeard")
assert.Equal(t, true, v.Get("hasbeard"))
v.Set("hasbeard", false)
assert.Equal(t, false, v.Get("beard"))
}
func TestYML(t *testing.T) {
v := New()
v.SetConfigType("yaml")
// Read the YAML data into Viper configuration
require.NoError(t, v.ReadConfig(bytes.NewBuffer(yamlExample)), "Error reading YAML data")
assert.Equal(t, "steve", v.Get("name"))
}
func TestJSON(t *testing.T) {
v := New()
v.SetConfigType("json")
// Read the JSON data into Viper configuration
require.NoError(t, v.ReadConfig(bytes.NewBuffer(jsonExample)), "Error reading JSON data")
assert.Equal(t, "0001", v.Get("id"))
}
func TestTOML(t *testing.T) {
v := New()
v.SetConfigType("toml")
// Read the TOML data into Viper configuration
require.NoError(t, v.ReadConfig(bytes.NewBuffer(tomlExample)), "Error reading toml data")
assert.Equal(t, "TOML Example", v.Get("title"))
}
func TestDotEnv(t *testing.T) {
v := New()
v.SetConfigType("env")
// Read the dotenv data into Viper configuration
require.NoError(t, v.ReadConfig(bytes.NewBuffer(dotenvExample)), "Error reading env data")
assert.Equal(t, "DotEnv Example", v.Get("title_dotenv"))
}
func TestRemotePrecedence(t *testing.T) {
v := New()
v.SetConfigType("json")
// Read the remote data into Viper configuration v.config
require.NoError(t, v.ReadConfig(bytes.NewBuffer(jsonExample)), "Error reading json data")
assert.Equal(t, "0001", v.Get("id"))
// update the kvstore with the remoteExample which should overite the key in v.config
remote := bytes.NewReader(remoteExample)
require.NoError(t, v.unmarshalReader(remote, v.kvstore), "Error reading json data in to kvstore")
assert.Equal(t, "0001", v.Get("id"))
assert.NotEqual(t, "cronut", v.Get("type"))
assert.Equal(t, "remote", v.Get("newkey"))
v.Set("newkey", "newvalue")
assert.NotEqual(t, "remote", v.Get("newkey"))
assert.Equal(t, "newvalue", v.Get("newkey"))
}
func TestEnv(t *testing.T) {
v := New()
v.SetConfigType("json")
// Read the JSON data into Viper configuration v.config
require.NoError(t, v.ReadConfig(bytes.NewBuffer(jsonExample)), "Error reading json data")
v.BindEnv("id")
v.BindEnv("f", "FOOD", "OLD_FOOD")
t.Setenv("ID", "13")
t.Setenv("FOOD", "apple")
t.Setenv("OLD_FOOD", "banana")
t.Setenv("NAME", "crunk")
assert.Equal(t, "13", v.Get("id"))
assert.Equal(t, "apple", v.Get("f"))
assert.Equal(t, "Cake", v.Get("name"))
v.AutomaticEnv()
assert.Equal(t, "crunk", v.Get("name"))
}
func TestMultipleEnv(t *testing.T) {
v := New()
v.SetConfigType("json")
// Read the JSON data into Viper configuration v.config
require.NoError(t, v.ReadConfig(bytes.NewBuffer(jsonExample)), "Error reading json data")
v.BindEnv("f", "FOOD", "OLD_FOOD")
t.Setenv("OLD_FOOD", "banana")
assert.Equal(t, "banana", v.Get("f"))
}
func TestEmptyEnv(t *testing.T) {
v := New()
v.SetConfigType("json")
// Read the JSON data into Viper configuration v.config
require.NoError(t, v.ReadConfig(bytes.NewBuffer(jsonExample)), "Error reading json data")
v.BindEnv("type") // Empty environment variable
v.BindEnv("name") // Bound, but not set environment variable
t.Setenv("TYPE", "")
assert.Equal(t, "donut", v.Get("type"))
assert.Equal(t, "Cake", v.Get("name"))
}
func TestEmptyEnv_Allowed(t *testing.T) {
v := New()
v.SetConfigType("json")
// Read the JSON data into Viper configuration v.config
require.NoError(t, v.ReadConfig(bytes.NewBuffer(jsonExample)), "Error reading json data")
v.AllowEmptyEnv(true)
v.BindEnv("type") // Empty environment variable
v.BindEnv("name") // Bound, but not set environment variable
t.Setenv("TYPE", "")
assert.Equal(t, "", v.Get("type"))
assert.Equal(t, "Cake", v.Get("name"))
}
func TestEnvPrefix(t *testing.T) {
v := New()
v.SetConfigType("json")
// Read the JSON data into Viper configuration v.config
require.NoError(t, v.ReadConfig(bytes.NewBuffer(jsonExample)), "Error reading json data")
v.SetEnvPrefix("foo") // will be uppercased automatically
v.BindEnv("id")
v.BindEnv("f", "FOOD") // not using prefix
t.Setenv("FOO_ID", "13")
t.Setenv("FOOD", "apple")
t.Setenv("FOO_NAME", "crunk")
assert.Equal(t, "13", v.Get("id"))
assert.Equal(t, "apple", v.Get("f"))
assert.Equal(t, "Cake", v.Get("name"))
v.AutomaticEnv()
assert.Equal(t, "crunk", v.Get("name"))
}
func TestAutoEnv(t *testing.T) {
v := New()
v.AutomaticEnv()
t.Setenv("FOO_BAR", "13")
assert.Equal(t, "13", v.Get("foo_bar"))
}
func TestAutoEnvWithPrefix(t *testing.T) {
v := New()
v.AutomaticEnv()
v.SetEnvPrefix("Baz")
t.Setenv("BAZ_BAR", "13")
assert.Equal(t, "13", v.Get("bar"))
}
func TestSetEnvKeyReplacer(t *testing.T) {
v := New()
v.AutomaticEnv()
t.Setenv("REFRESH_INTERVAL", "30s")
replacer := strings.NewReplacer("-", "_")
v.SetEnvKeyReplacer(replacer)
assert.Equal(t, "30s", v.Get("refresh-interval"))
}
func TestEnvKeyReplacer(t *testing.T) {
v := NewWithOptions(EnvKeyReplacer(strings.NewReplacer("-", "_")))
v.AutomaticEnv()
t.Setenv("REFRESH_INTERVAL", "30s")
assert.Equal(t, "30s", v.Get("refresh-interval"))
}
func TestEnvSubConfig(t *testing.T) {
v := New()
v.SetConfigType("yaml")
// Read the YAML data into Viper configuration v.config
require.NoError(t, v.ReadConfig(bytes.NewBuffer(yamlExample)), "Error reading json data")
v.AutomaticEnv()
v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
t.Setenv("CLOTHING_PANTS_SIZE", "small")
subv := v.Sub("clothing").Sub("pants")
assert.Equal(t, "small", subv.Get("size"))
// again with EnvPrefix
v.SetEnvPrefix("foo") // will be uppercased automatically
subWithPrefix := v.Sub("clothing").Sub("pants")
t.Setenv("FOO_CLOTHING_PANTS_SIZE", "large")
assert.Equal(t, "large", subWithPrefix.Get("size"))
}
func TestAllKeys(t *testing.T) {
v := New()
initConfigs(v)
ks := []string{
"title",
"newkey",
"owner.organization",
"owner.dob",
"owner.bio",
"name",
"beard",
"ppu",
"batters.batter",
"hobbies",
"clothing.jacket",
"clothing.trousers",
"clothing.pants.size",
"age",
"hacker",
"id",
"type",
"eyes",
"title_dotenv",
"type_dotenv",
"name_dotenv",
}
dob, _ := time.Parse(time.RFC3339, "1979-05-27T07:32:00Z")
all := map[string]any{
"owner": map[string]any{
"organization": "MongoDB",
"bio": "MongoDB Chief Developer Advocate & Hacker at Large",
"dob": dob,
},
"title": "TOML Example",
"ppu": 0.55,
"eyes": "brown",
"clothing": map[string]any{
"trousers": "denim",
"jacket": "leather",
"pants": map[string]any{"size": "large"},
},
"id": "0001",
"batters": map[string]any{
"batter": []any{
map[string]any{"type": "Regular"},
map[string]any{"type": "Chocolate"},
map[string]any{"type": "Blueberry"},
map[string]any{"type": "Devil's Food"},
},
},
"hacker": true,
"beard": true,
"hobbies": []any{
"skateboarding",
"snowboarding",
"go",
},
"age": 35,
"type": "donut",
"newkey": "remote",
"name": "Cake",
"title_dotenv": "DotEnv Example",
"type_dotenv": "donut",
"name_dotenv": "Cake",
}
assert.ElementsMatch(t, ks, v.AllKeys())
assert.Equal(t, all, v.AllSettings())
}
func TestAllKeysWithEnv(t *testing.T) {
v := New()
// bind and define environment variables (including a nested one)
v.BindEnv("id")
v.BindEnv("foo.bar")
v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
t.Setenv("ID", "13")
t.Setenv("FOO_BAR", "baz")
assert.ElementsMatch(t, []string{"id", "foo.bar"}, v.AllKeys())
}
func TestAliasesOfAliases(t *testing.T) {
v := New()
v.Set("Title", "Checking Case")
v.RegisterAlias("Foo", "Bar")
v.RegisterAlias("Bar", "Title")
assert.Equal(t, "Checking Case", v.Get("FOO"))
}
func TestRecursiveAliases(t *testing.T) {
v := New()
v.Set("baz", "bat")
v.RegisterAlias("Baz", "Roo")
v.RegisterAlias("Roo", "baz")
assert.Equal(t, "bat", v.Get("Baz"))
}
func TestUnmarshal(t *testing.T) {
v := New()
v.SetDefault("port", 1313)
v.Set("name", "Steve")
v.Set("duration", "1s1ms")
v.Set("modes", []int{1, 2, 3})
type config struct {
Port int
Name string
Duration time.Duration
Modes []int
}
var C config
require.NoError(t, v.Unmarshal(&C), "unable to decode into struct")
assert.Equal(
t,
&config{
Name: "Steve",
Port: 1313,
Duration: time.Second + time.Millisecond,
Modes: []int{1, 2, 3},
},
&C,
)
v.Set("port", 1234)
require.NoError(t, v.Unmarshal(&C), "unable to decode into struct")
assert.Equal(
t,
&config{
Name: "Steve",
Port: 1234,
Duration: time.Second + time.Millisecond,
Modes: []int{1, 2, 3},
},
&C,
)
}
func TestUnmarshalWithDefaultDecodeHook(t *testing.T) {
opt := mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToSliceHookFunc(","),
// Custom Decode Hook Function
func(rf reflect.Kind, rt reflect.Kind, data any) (any, error) {
if rf != reflect.String || rt != reflect.Map {
return data, nil
}
m := map[string]string{}
raw := data.(string)
if raw == "" {
return m, nil
}
err := json.Unmarshal([]byte(raw), &m)
return m, err
},
)
v := NewWithOptions(WithDecodeHook(opt))
v.Set("credentials", "{\"foo\":\"bar\"}")
type config struct {
Credentials map[string]string
}
var C config
require.NoError(t, v.Unmarshal(&C), "unable to decode into struct")
assert.Equal(t, &config{
Credentials: map[string]string{"foo": "bar"},
}, &C)
}
func TestUnmarshalWithDecoderOptions(t *testing.T) {
v := New()
v.Set("credentials", "{\"foo\":\"bar\"}")
opt := DecodeHook(mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToSliceHookFunc(","),
// Custom Decode Hook Function
func(rf reflect.Kind, rt reflect.Kind, data any) (any, error) {
if rf != reflect.String || rt != reflect.Map {
return data, nil
}
m := map[string]string{}
raw := data.(string)
if raw == "" {
return m, nil
}
err := json.Unmarshal([]byte(raw), &m)
return m, err
},
))
type config struct {
Credentials map[string]string
}
var C config
require.NoError(t, v.Unmarshal(&C, opt), "unable to decode into struct")
assert.Equal(t, &config{
Credentials: map[string]string{"foo": "bar"},
}, &C)
}
func TestUnmarshalWithAutomaticEnv(t *testing.T) {
t.Setenv("PORT", "1313")
t.Setenv("NAME", "Steve")
t.Setenv("DURATION", "1s1ms")
t.Setenv("MODES", "1,2,3")
t.Setenv("SECRET", "42")
t.Setenv("FILESYSTEM_SIZE", "4096")
type AuthConfig struct {
Secret string `mapstructure:"secret"`
}
type StorageConfig struct {
Size int `mapstructure:"size"`
}
type Configuration struct {
Port int `mapstructure:"port"`
Name string `mapstructure:"name"`
Duration time.Duration `mapstructure:"duration"`
// Infer name from struct
Modes []int
// Squash nested struct (omit prefix)
Authentication AuthConfig `mapstructure:",squash"`
// Different key
Storage StorageConfig `mapstructure:"filesystem"`
// Omitted field
Flag bool `mapstructure:"flag"`
}