mirror
/
viper
mirror of https://github.com/spf13/viper.git
1
0
Fork 1
Code Issues Packages Projects Releases Wiki Activity

Resolved merge conflicts in viper.go

This commit is contained in:
Andrey Odintsov 2018-11-26 12:16:57 +03:00
parent e919dff7ac 06c7c0d9b3
commit 319b0fc627
7 changed files with 390 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
.gitignore vendored
View File

@ -22,3 +22,9 @@ _testmain.go
*.exe
*.test
*.bench
.vscode
# exclude dependencies in the `/vendor` folder
vendor
.idea

2
.travis.yml
View File

@ -2,8 +2,8 @@ go_import_path: github.com/spf13/viper
language: go
go:
- 1.9.x
- 1.10.x
- 1.11.x
- tip
os:

52
README.md
View File

@ -179,19 +179,20 @@ viper.GetBool("verbose") // true
### Working with Environment Variables
Viper has full support for environment variables. This enables 12 factor
applications out of the box. There are four methods that exist to aid working
applications out of the box. There are five methods that exist to aid working
with ENV:
* `AutomaticEnv()`
* `BindEnv(string...) : error`
* `SetEnvPrefix(string)`
* `SetEnvKeyReplacer(string...) *strings.Replacer`
* `AllowEmptyEnvVar(bool)`
_When working with ENV variables, it’s important to recognize that Viper
treats ENV variables as case sensitive._
Viper provides a mechanism to try to ensure that ENV variables are unique. By
using `SetEnvPrefix`, you can tell Viper to use add a prefix while reading from
using `SetEnvPrefix`, you can tell Viper to use a prefix while reading from
the environment variables. Both `BindEnv` and `AutomaticEnv` will use this
prefix.
@ -217,6 +218,10 @@ keys to an extent. This is useful if you want to use `-` or something in your
`Get()` calls, but want your environmental variables to use `_` delimiters. An
example of using it can be found in `viper_test.go`.
By default empty environment variables are considered unset and will fall back to
the next configuration source. To treat empty environment variables as set, use
the `AllowEmptyEnv` method.
#### Env example
```go
@ -373,12 +378,33 @@ how to use Consul.
### Remote Key/Value Store Example - Unencrypted
#### etcd
```go
viper.AddRemoteProvider("etcd", "http://127.0.0.1:4001","/config/hugo.json")
viper.SetConfigType("json") // because there is no file extension in a stream of bytes, supported extensions are "json", "toml", "yaml", "yml", "properties", "props", "prop"
err := viper.ReadRemoteConfig()
```
#### Consul
You need to set a key to Consul key/value storage with JSON value containing your desired config.
For example, create a Consul key/value store key `MY_CONSUL_KEY` with value:
```json
{
"port": 8080,
"hostname": "myhostname.com"
}
```
```go
viper.AddRemoteProvider("consul", "localhost:8500", "MY_CONSUL_KEY")
viper.SetConfigType("json") // Need to explicitly set this to json
err := viper.ReadRemoteConfig()
fmt.Println(viper.Get("port")) // 8080
fmt.Println(viper.Get("hostname")) // myhostname.com
```
### Remote Key/Value Store Example - Encrypted
```go
@ -437,6 +463,7 @@ The following functions and methods exist:
* `GetTime(key string) : time.Time`
* `GetDuration(key string) : time.Duration`
* `IsSet(key string) : bool`
* `AllSettings() : map[string]interface{}`
One important thing to recognize is that each Get function will return a zero
value if it’s not found. To check if a given key exists, the `IsSet()` method
@ -590,6 +617,27 @@ if err != nil {
}
```
### Marshalling to string
You may need to marhsal all the settings held in viper into a string rather than write them to a file.
You can use your favorite format's marshaller with the config returned by `AllSettings()`.
```go
import (
yaml "gopkg.in/yaml.v2"
// ...
)
func yamlStringSettings() string {
c := viper.AllSettings()
bs, err := yaml.Marshal(c)
if err != nil {
t.Fatalf("unable to marshal config to YAML: %v", err)
}
return string(bs)
}
```
## Viper or Vipers?
Viper comes ready to use out of the box. There is no configuration or

16
go.mod Normal file
View File

@ -0,0 +1,16 @@
module github.com/spf13/viper
require (
github.com/fsnotify/fsnotify v1.4.7
github.com/hashicorp/hcl v1.0.0
github.com/magiconair/properties v1.8.0
github.com/mitchellh/mapstructure v1.0.0
github.com/pelletier/go-toml v1.2.0
github.com/spf13/afero v1.1.2
github.com/spf13/cast v1.2.0
github.com/spf13/jwalterweatherman v1.0.0
github.com/spf13/pflag v1.0.2
golang.org/x/sys v0.0.0-20180906133057-8cf3aee42992 // indirect
golang.org/x/text v0.3.0 // indirect
gopkg.in/yaml.v2 v2.2.1
)

26
go.sum Normal file
View File

@ -0,0 +1,26 @@
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
github.com/magiconair/properties v1.8.0 h1:LLgXmsheXeRoUOBOjtwPQCWIYqM/LU1ayDtDePerRcY=
github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
github.com/mitchellh/mapstructure v1.0.0 h1:vVpGvMXJPqSDh2VYHF7gsfQj8Ncx+Xw5Y1KHeTRY+7I=
github.com/mitchellh/mapstructure v1.0.0/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
github.com/pelletier/go-toml v1.2.0 h1:T5zMGML61Wp+FlcbWjRDT7yAxhJNAiPPLOFECq181zc=
github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
github.com/spf13/afero v1.1.2 h1:m8/z1t7/fwjysjQRYbP0RD+bUIF/8tJwPdEZsI83ACI=
github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
github.com/spf13/cast v1.2.0 h1:HHl1DSRbEQN2i8tJmtS6ViPyHx35+p51amrdsiTCrkg=
github.com/spf13/cast v1.2.0/go.mod h1:r2rcYCSwa1IExKTDiTfzaxqT2FNHs8hODu4LnUfgKEg=
github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9Gc1vn7yk=
github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
github.com/spf13/pflag v1.0.2 h1:Fy0orTDgHdbnzHcsOgfCN4LtHf0ec3wwtiwJqwvf3Gc=
github.com/spf13/pflag v1.0.2/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
golang.org/x/sys v0.0.0-20180906133057-8cf3aee42992 h1:BH3eQWeGbwRU2+wxxuuPOdFBmaiBH81O8BugSjHeTFg=
golang.org/x/sys v0.0.0-20180906133057-8cf3aee42992/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

132
viper.go
View File

@ -30,6 +30,7 @@ import (
"path/filepath"
"reflect"
"strings"
"sync"
"time"
yaml "gopkg.in/yaml.v2"
@ -113,6 +114,23 @@ func (fnfe ConfigFileNotFoundError) Error() string {
return fmt.Sprintf("Config File %q Not Found in %q", fnfe.name, fnfe.locations)
}
// A DecoderConfigOption can be passed to viper.Unmarshal to configure
// mapstructure.DecoderConfig options
type DecoderConfigOption func(*mapstructure.DecoderConfig)
// DecodeHook returns a DecoderConfigOption which overrides the default
// DecoderConfig.DecodeHook value, the default is:
//
// mapstructure.ComposeDecodeHookFunc(
// mapstructure.StringToTimeDurationHookFunc(),
// mapstructure.StringToSliceHookFunc(","),
// )
func DecodeHook(hook mapstructure.DecodeHookFunc) DecoderConfigOption {
return func(c *mapstructure.DecoderConfig) {
c.DecodeHook = hook
}
}
// Viper is a prioritized configuration registry. It
// maintains a set of configuration sources, fetches
// values to populate those, and provides them according
@ -169,6 +187,7 @@ type Viper struct {
automaticEnvApplied bool
envKeyReplacer *strings.Replacer
allowEmptyEnv bool
config map[string]interface{}
override map[string]interface{}
@ -259,50 +278,73 @@ func (v *Viper) OnConfigChange(run func(in fsnotify.Event)) {
}
func WatchConfig() { v.WatchConfig() }
func (v *Viper) WatchConfig() {
initWG := sync.WaitGroup{}
initWG.Add(1)
go func() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
// we have to watch the entire directory to pick up renames/atomic saves in a cross-platform way
filename, err := v.getConfigFile()
if err != nil {
log.Println("error:", err)
log.Printf("error: %v\n", err)
return
}
configFile := filepath.Clean(filename)
configDir, _ := filepath.Split(configFile)
realConfigFile, _ := filepath.EvalSymlinks(filename)
done := make(chan bool)
eventsWG := sync.WaitGroup{}
eventsWG.Add(1)
go func() {
for {
select {
case event := <-watcher.Events:
// we only care about the config file
if filepath.Clean(event.Name) == configFile {
if event.Op&fsnotify.Write == fsnotify.Write || event.Op&fsnotify.Create == fsnotify.Create {
err := v.ReadInConfig()
if err != nil {
log.Println("error:", err)
}
if v.onConfigChange != nil {
v.onConfigChange(event)
}
}
case event, ok := <-watcher.Events:
if !ok { // 'Events' channel is closed
eventsWG.Done()
return
}
case err := <-watcher.Errors:
log.Println("error:", err)
currentConfigFile, _ := filepath.EvalSymlinks(filename)
// we only care about the config file with the following cases:
// 1 - if the config file was modified or created
// 2 - if the real path to the config file changed (eg: k8s ConfigMap replacement)
const writeOrCreateMask = fsnotify.Write | fsnotify.Create
if (filepath.Clean(event.Name) == configFile &&
event.Op&writeOrCreateMask != 0) ||
(currentConfigFile != "" && currentConfigFile != realConfigFile) {
realConfigFile = currentConfigFile
err := v.ReadInConfig()
if err != nil {
log.Printf("error reading config file: %v\n", err)
}
if v.onConfigChange != nil {
v.onConfigChange(event)
}
} else if filepath.Clean(event.Name) == configFile &&
event.Op&fsnotify.Remove&fsnotify.Remove != 0 {
eventsWG.Done()
return
}
case err, ok := <-watcher.Errors:
if ok { // 'Errors' channel is not closed
log.Printf("watcher error: %v\n", err)
}
eventsWG.Done()
return
}
}
}()
watcher.Add(configDir)
<-done
initWG.Done() // done initalizing the watch in this go routine, so the parent routine can move on...
eventsWG.Wait() // now, wait for event loop to end in this go-routine...
}()
initWG.Wait() // make sure that the go routine above fully ended before returning
}
// SetConfigFile explicitly defines the path, name and extension of the config file.
@ -332,6 +374,14 @@ func (v *Viper) mergeWithEnvPrefix(in string) string {
return strings.ToUpper(in)
}
// AllowEmptyEnv tells Viper to consider set,
// but empty environment variables as valid values instead of falling back.
// For backward compatibility reasons this is false by default.
func AllowEmptyEnv(allowEmptyEnv bool) { v.AllowEmptyEnv(allowEmptyEnv) }
func (v *Viper) AllowEmptyEnv(allowEmptyEnv bool) {
v.allowEmptyEnv = allowEmptyEnv
}
// TODO: should getEnv logic be moved into find(). Can generalize the use of
// rewriting keys many things, Ex: Get('someKey') -> some_key
// (camel case to snake case for JSON keys perhaps)
@ -339,11 +389,14 @@ func (v *Viper) mergeWithEnvPrefix(in string) string {
// getEnv is a wrapper around os.Getenv which replaces characters in the original
// key. This allows env vars which have different keys than the config object
// keys.
func (v *Viper) getEnv(key string) string {
func (v *Viper) getEnv(key string) (string, bool) {
if v.envKeyReplacer != nil {
key = v.envKeyReplacer.Replace(key)
}
return os.Getenv(key)
val, ok := os.LookupEnv(key)
return val, ok && (v.allowEmptyEnv || val != "")
}
// ConfigFileUsed returns the file used to populate the config registry.
@ -570,10 +623,9 @@ func (v *Viper) isPathShadowedInFlatMap(path []string, mi interface{}) string {
// "foo.bar.baz" in a lower-priority map
func (v *Viper) isPathShadowedInAutoEnv(path []string) string {
var parentKey string
var val string
for i := 1; i < len(path); i++ {
parentKey = strings.Join(path[0:i], v.keyDelim)
if val = v.getEnv(v.mergeWithEnvPrefix(parentKey)); val != "" {
if _, ok := v.getEnv(v.mergeWithEnvPrefix(parentKey)); ok {
return parentKey
}
}
@ -633,8 +685,10 @@ func (v *Viper) Get(key string) interface{} {
return cast.ToBool(val)
case string:
return cast.ToString(val)
case int64, int32, int16, int8, int:
case int32, int16, int8, int:
return cast.ToInt(val)
case int64:
return cast.ToInt64(val)
case float64, float32:
return cast.ToFloat64(val)
case time.Time:
@ -747,9 +801,11 @@ func (v *Viper) GetSizeInBytes(key string) uint {
}
// UnmarshalKey takes a single key and unmarshals it into a Struct.
func UnmarshalKey(key string, rawVal interface{}) error { return v.UnmarshalKey(key, rawVal) }
func (v *Viper) UnmarshalKey(key string, rawVal interface{}) error {
err := decode(v.Get(key), defaultDecoderConfig(rawVal))
func UnmarshalKey(key string, rawVal interface{}, opts ...DecoderConfigOption) error {
return v.UnmarshalKey(key, rawVal, opts...)
}
func (v *Viper) UnmarshalKey(key string, rawVal interface{}, opts ...DecoderConfigOption) error {
err := decode(v.Get(key), defaultDecoderConfig(rawVal, opts...))
if err != nil {
return err
@ -762,9 +818,11 @@ func (v *Viper) UnmarshalKey(key string, rawVal interface{}) error {
// Unmarshal unmarshals the config into a Struct. Make sure that the tags
// on the fields of the structure are properly set.
func Unmarshal(rawVal interface{}) error { return v.Unmarshal(rawVal) }
func (v *Viper) Unmarshal(rawVal interface{}) error {
err := decode(v.AllSettings(), defaultDecoderConfig(rawVal))
func Unmarshal(rawVal interface{}, opts ...DecoderConfigOption) error {
return v.Unmarshal(rawVal, opts...)
}
func (v *Viper) Unmarshal(rawVal interface{}, opts ...DecoderConfigOption) error {
err := decode(v.AllSettings(), defaultDecoderConfig(rawVal, opts...))
if err != nil {
return err
@ -777,8 +835,8 @@ func (v *Viper) Unmarshal(rawVal interface{}) error {
// defaultDecoderConfig returns default mapsstructure.DecoderConfig with suppot
// of time.Duration values & string slices
func defaultDecoderConfig(output interface{}) *mapstructure.DecoderConfig {
return &mapstructure.DecoderConfig{
func defaultDecoderConfig(output interface{}, opts ...DecoderConfigOption) *mapstructure.DecoderConfig {
c := &mapstructure.DecoderConfig{
Metadata: nil,
Result: output,
WeaklyTypedInput: true,
@ -787,6 +845,10 @@ func defaultDecoderConfig(output interface{}) *mapstructure.DecoderConfig {
mapstructure.StringToSliceHookFunc(","),
),
}
for _, opt := range opts {
opt(c)
}
return c
}
// A wrapper around mapstructure.Decode that mimics the WeakDecode functionality
@ -942,7 +1004,7 @@ func (v *Viper) find(lcaseKey string) interface{} {
if v.automaticEnvApplied {
// even if it hasn't been registered, if automaticEnv is used,
// check any Get request
if val = v.getEnv(v.mergeWithEnvPrefix(lcaseKey)); val != "" {
if val, ok := v.getEnv(v.mergeWithEnvPrefix(lcaseKey)); ok {
return val
}
if nested && v.isPathShadowedInAutoEnv(path) != "" {
@ -951,7 +1013,7 @@ func (v *Viper) find(lcaseKey string) interface{} {
}
envkey, exists := v.env[lcaseKey]
if exists {
if val = v.getEnv(envkey); val != "" {
if val, ok := v.getEnv(envkey); ok {
return val
}
}
@ -1116,7 +1178,7 @@ func (v *Viper) SetDefault(key string, value interface{}) {
deepestMap[lastKey] = value
}
// Set sets the value for the key in the override regiser.
// Set sets the value for the key in the override register.
// Set is case-insensitive for a key.
// Will be used instead of values obtained via
// flags, config file, ENV, default, or key/value store.

212
viper_test.go
View File

@ -7,22 +7,29 @@ package viper
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"reflect"
"runtime"
"sort"
"strings"
"sync"
"testing"
"time"
"github.com/fsnotify/fsnotify"
"github.com/mitchellh/mapstructure"
"github.com/spf13/afero"
"github.com/spf13/cast"
"github.com/spf13/pflag"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var yamlExample = []byte(`Hacker: true
@ -381,6 +388,36 @@ func TestEnv(t *testing.T) {
}
func TestEmptyEnv(t *testing.T) {
initJSON()
BindEnv("type") // Empty environment variable
BindEnv("name") // Bound, but not set environment variable
os.Clearenv()
os.Setenv("TYPE", "")
assert.Equal(t, "donut", Get("type"))
assert.Equal(t, "Cake", Get("name"))
}
func TestEmptyEnv_Allowed(t *testing.T) {
initJSON()
AllowEmptyEnv(true)
BindEnv("type") // Empty environment variable
BindEnv("name") // Bound, but not set environment variable
os.Clearenv()
os.Setenv("TYPE", "")
assert.Equal(t, "", Get("type"))
assert.Equal(t, "Cake", Get("name"))
}
func TestEnvPrefix(t *testing.T) {
initJSON()
@ -503,6 +540,42 @@ func TestUnmarshal(t *testing.T) {
assert.Equal(t, &config{Name: "Steve", Port: 1234, Duration: time.Second + time.Millisecond}, &C)
}
func TestUnmarshalWithDecoderOptions(t *testing.T) {
Set("credentials", "{\"foo\":\"bar\"}")
opt := DecodeHook(mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToSliceHookFunc(","),
// Custom Decode Hook Function
func(rf reflect.Kind, rt reflect.Kind, data interface{}) (interface{}, error) {
if rf != reflect.String || rt != reflect.Map {
return data, nil
}
m := map[string]string{}
raw := data.(string)
if raw == "" {
return m, nil
}
return m, json.Unmarshal([]byte(raw), &m)
},
))
type config struct {
Credentials map[string]string
}
var C config
err := Unmarshal(&C, opt)
if err != nil {
t.Fatalf("unable to decode into struct, %v", err)
}
assert.Equal(t, &config{
Credentials: map[string]string{"foo": "bar"},
}, &C)
}
func TestBindPFlags(t *testing.T) {
v := New() // create independent Viper object
flagSet := pflag.NewFlagSet("test", pflag.ContinueOnError)
@ -540,24 +613,28 @@ func TestBindPFlags(t *testing.T) {
}
func TestBindPFlagsStringSlice(t *testing.T) {
for _, testValue := range []struct {
tests := []struct {
Expected []string
Value string
}{
{[]string{}, ""},
{[]string{"jeden"}, "jeden"},
{[]string{"dwa", "trzy"}, "dwa,trzy"},
{[]string{"cztery", "piec , szesc"}, "cztery,\"piec , szesc\""}} {
{[]string{"cztery", "piec , szesc"}, "cztery,\"piec , szesc\""},
}
v := New() // create independent Viper object
defaultVal := []string{"default"}
v.SetDefault("stringslice", defaultVal)
for _, testValue := range tests {
flagSet := pflag.NewFlagSet("test", pflag.ContinueOnError)
flagSet.StringSlice("stringslice", testValue.Expected, "test")
for _, changed := range []bool{true, false} {
v := New() // create independent Viper object
flagSet := pflag.NewFlagSet("test", pflag.ContinueOnError)
flagSet.StringSlice("stringslice", testValue.Expected, "test")
flagSet.Visit(func(f *pflag.Flag) {
if len(testValue.Value) > 0 {
f.Value.Set(testValue.Value)
f.Changed = changed
}
flagSet.VisitAll(func(f *pflag.Flag) {
f.Value.Set(testValue.Value)
f.Changed = changed
})
err := v.BindPFlags(flagSet)
@ -572,7 +649,11 @@ func TestBindPFlagsStringSlice(t *testing.T) {
if err := v.Unmarshal(val); err != nil {
t.Fatalf("%+#v cannot unmarshal: %s", testValue.Value, err)
}
assert.Equal(t, testValue.Expected, val.StringSlice)
if changed {
assert.EqualValues(t, testValue.Expected, val.StringSlice)
} else {
assert.Equal(t, defaultVal, val.StringSlice)
}
}
}
}
@ -1064,10 +1145,6 @@ func TestMergeConfig(t *testing.T) {
t.Fatalf("pop != 37890, = %d", pop)
}
if pop := v.GetInt("hello.lagrenum"); pop != 765432101234567 {
t.Fatalf("lagrenum != 765432101234567, = %d", pop)
}
if pop := v.GetInt32("hello.pop"); pop != int32(37890) {
t.Fatalf("pop != 37890, = %d", pop)
}
@ -1092,10 +1169,6 @@ func TestMergeConfig(t *testing.T) {
t.Fatalf("pop != 45000, = %d", pop)
}
if pop := v.GetInt("hello.lagrenum"); pop != 7654321001234567 {
t.Fatalf("lagrenum != 7654321001234567, = %d", pop)
}
if pop := v.GetInt32("hello.pop"); pop != int32(45000) {
t.Fatalf("pop != 45000, = %d", pop)
}
@ -1376,6 +1449,107 @@ func doTestCaseInsensitive(t *testing.T, typ, config string) {
}
func newViperWithConfigFile(t *testing.T) (*Viper, string, func()) {
watchDir, err := ioutil.TempDir("", "")
require.Nil(t, err)
configFile := path.Join(watchDir, "config.yaml")
err = ioutil.WriteFile(configFile, []byte("foo: bar\n"), 0640)
require.Nil(t, err)
cleanup := func() {
os.RemoveAll(watchDir)
}
v := New()
v.SetConfigFile(configFile)
err = v.ReadInConfig()
require.Nil(t, err)
require.Equal(t, "bar", v.Get("foo"))
return v, configFile, cleanup
}
func newViperWithSymlinkedConfigFile(t *testing.T) (*Viper, string, string, func()) {
watchDir, err := ioutil.TempDir("", "")
require.Nil(t, err)
dataDir1 := path.Join(watchDir, "data1")
err = os.Mkdir(dataDir1, 0777)
require.Nil(t, err)
realConfigFile := path.Join(dataDir1, "config.yaml")
t.Logf("Real config file location: %s\n", realConfigFile)
err = ioutil.WriteFile(realConfigFile, []byte("foo: bar\n"), 0640)
require.Nil(t, err)
cleanup := func() {
os.RemoveAll(watchDir)
}
// now, symlink the tm `data1` dir to `data` in the baseDir
os.Symlink(dataDir1, path.Join(watchDir, "data"))
// and link the `<watchdir>/datadir1/config.yaml` to `<watchdir>/config.yaml`
configFile := path.Join(watchDir, "config.yaml")
os.Symlink(path.Join(watchDir, "data", "config.yaml"), configFile)
t.Logf("Config file location: %s\n", path.Join(watchDir, "config.yaml"))
// init Viper
v := New()
v.SetConfigFile(configFile)
err = v.ReadInConfig()
require.Nil(t, err)
require.Equal(t, "bar", v.Get("foo"))
return v, watchDir, configFile, cleanup
}
func TestWatchFile(t *testing.T) {
t.Run("file content changed", func(t *testing.T) {
// given a `config.yaml` file being watched
v, configFile, cleanup := newViperWithConfigFile(t)
defer cleanup()
_, err := os.Stat(configFile)
require.NoError(t, err)
t.Logf("test config file: %s\n", configFile)
wg := sync.WaitGroup{}
wg.Add(1)
v.OnConfigChange(func(in fsnotify.Event) {
t.Logf("config file changed")
wg.Done()
})
v.WatchConfig()
// when overwriting the file and waiting for the custom change notification handler to be triggered
err = ioutil.WriteFile(configFile, []byte("foo: baz\n"), 0640)
wg.Wait()
// then the config value should have changed
require.Nil(t, err)
assert.Equal(t, "baz", v.Get("foo"))
})
t.Run("link to real file changed (à la Kubernetes)", func(t *testing.T) {
// skip if not executed on Linux
if runtime.GOOS != "linux" {
t.Skipf("Skipping test as symlink replacements don't work on non-linux environment...")
}
v, watchDir, _, _ := newViperWithSymlinkedConfigFile(t)
// defer cleanup()
wg := sync.WaitGroup{}
v.WatchConfig()
v.OnConfigChange(func(in fsnotify.Event) {
t.Logf("config file changed")
wg.Done()
})
wg.Add(1)
// when link to another `config.yaml` file
dataDir2 := path.Join(watchDir, "data2")
err := os.Mkdir(dataDir2, 0777)
require.Nil(t, err)
configFile2 := path.Join(dataDir2, "config.yaml")
err = ioutil.WriteFile(configFile2, []byte("foo: baz\n"), 0640)
require.Nil(t, err)
// change the symlink using the `ln -sfn` command
err = exec.Command("ln", "-sfn", dataDir2, path.Join(watchDir, "data")).Run()
require.Nil(t, err)
wg.Wait()
// then
require.Nil(t, err)
assert.Equal(t, "baz", v.Get("foo"))
})
}
func BenchmarkGetBool(b *testing.B) {
key := "BenchmarkGetBool"
v = New()