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Vlad Didenko 2015-11-03 14:14:14 -06:00
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30
README.md
View file

@ -1,13 +1,13 @@
viper [![Build Status](https://travis-ci.org/spf13/viper.svg)](https://travis-ci.org/spf13/viper)
=====
![viper logo](https://cloud.githubusercontent.com/assets/173412/10886745/998df88a-8151-11e5-9448-4736db51020d.png)
[![Join the chat at https://gitter.im/spf13/viper](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/spf13/viper?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
Go configuration with fangs!
[![Build Status](https://travis-ci.org/spf13/viper.svg)](https://travis-ci.org/spf13/viper) [![Join the chat at https://gitter.im/spf13/viper](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/spf13/viper?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
Go configuration with fangs
## What is Viper?
Viper is a complete configuration solution for go applications. It is designed
Viper is a complete configuration solution for go applications including 12 factor apps. It is designed
to work within an application, and can handle all types of configuration needs
and formats. It supports:
@ -30,7 +30,7 @@ Viper is here to help with that.
Viper does the following for you:
1. Find, load, and marshal a configuration file in JSON, TOML, or YAML.
1. Find, load, and unmarshal a configuration file in JSON, TOML, or YAML.
2. Provide a mechanism to set default values for your different
configuration options.
3. Provide a mechanism to set override values for options specified through
@ -272,8 +272,8 @@ runtime_viper.SetConfigType("yaml") // because there is no file extension in a s
// read from remote config the first time.
err := runtime_viper.ReadRemoteConfig()
// marshal config
runtime_viper.Marshal(&runtime_conf)
// unmarshal config
runtime_viper.Unmarshal(&runtime_conf)
// open a goroutine to wath remote changes forever
go func(){
@ -287,9 +287,9 @@ go func(){
continue
}
// marshal new config into our runtime config struct. you can also use channel
// unmarshal new config into our runtime config struct. you can also use channel
// to implement a signal to notify the system of the changes
runtime_viper.Marshal(&runtime_conf)
runtime_viper.Unmarshal(&runtime_conf)
}
}()
```
@ -389,15 +389,15 @@ will be returned instead. E.g.
GetString("datastore.metric.host") //returns "0.0.0.0"
```
### Marshaling
### Unmarshaling
You also have the option of Marshaling all or a specific value to a struct, map,
You also have the option of Unmarshaling all or a specific value to a struct, map,
etc.
There are two methods to do this:
* `Marshal(rawVal interface{}) : error`
* `MarshalKey(key string, rawVal interface{}) : error`
* `Unmarshal(rawVal interface{}) : error`
* `UnmarshalKey(key string, rawVal interface{}) : error`
Example:
@ -409,7 +409,7 @@ type config struct {
var C config
err := Marshal(&C)
err := Unmarshal(&C)
if err != nil {
t.Fatalf("unable to decode into struct, %v", err)
}

2
util.go
View file

@ -129,7 +129,7 @@ func findCWD() (string, error) {
return path, nil
}
func marshallConfigReader(in io.Reader, c map[string]interface{}, configType string) error {
func unmarshallConfigReader(in io.Reader, c map[string]interface{}, configType string) error {
buf := new(bytes.Buffer)
buf.ReadFrom(in)

78
viper.go
View file

@ -150,6 +150,7 @@ type Viper struct {
pflags map[string]*pflag.Flag
env map[string]string
aliases map[string]string
typeByDefValue bool
}
// Returns an initialized Viper instance.
@ -164,6 +165,7 @@ func New() *Viper {
v.pflags = make(map[string]*pflag.Flag)
v.env = make(map[string]string)
v.aliases = make(map[string]string)
v.typeByDefValue = false
return v
}
@ -368,6 +370,25 @@ func (v *Viper) searchMap(source map[string]interface{}, path []string) interfac
}
}
// SetTypeByDefaultValue enables or disables the inference of a key value's
// type when the Get function is used based upon a key's default value as
// opposed to the value returned based on the normal fetch logic.
//
// For example, if a key has a default value of []string{} and the same key
// is set via an environment variable to "a b c", a call to the Get function
// would return a string slice for the key if the key's type is inferred by
// the default value and the Get function would return:
//
// []string {"a", "b", "c"}
//
// Otherwise the Get function would return:
//
// "a b c"
func SetTypeByDefaultValue(enable bool) { v.SetTypeByDefaultValue(enable) }
func (v *Viper) SetTypeByDefaultValue(enable bool) {
v.typeByDefValue = enable
}
// Viper is essentially repository for configurations
// Get can retrieve any value given the key to use
// Get has the behavior of returning the value associated with the first
@ -379,7 +400,8 @@ func Get(key string) interface{} { return v.Get(key) }
func (v *Viper) Get(key string) interface{} {
path := strings.Split(key, v.keyDelim)
val := v.find(strings.ToLower(key))
lcaseKey := strings.ToLower(key)
val := v.find(lcaseKey)
if val == nil {
source := v.find(path[0])
@ -392,7 +414,19 @@ func (v *Viper) Get(key string) interface{} {
}
}
switch val.(type) {
var valType interface{}
if !v.typeByDefValue {
valType = val
} else {
defVal, defExists := v.defaults[lcaseKey]
if defExists {
valType = defVal
} else {
valType = val
}
}
switch valType.(type) {
case bool:
return cast.ToBool(val)
case string:
@ -406,7 +440,7 @@ func (v *Viper) Get(key string) interface{} {
case time.Duration:
return cast.ToDuration(val)
case []string:
return val
return cast.ToStringSlice(val)
}
return val
}
@ -465,6 +499,12 @@ func (v *Viper) GetStringMapString(key string) map[string]string {
return cast.ToStringMapString(v.Get(key))
}
// Returns the value associated with the key as a map to a slice of strings.
func GetStringMapStringSlice(key string) map[string][]string { return v.GetStringMapStringSlice(key) }
func (v *Viper) GetStringMapStringSlice(key string) map[string][]string {
return cast.ToStringMapStringSlice(v.Get(key))
}
// Returns the size of the value associated with the given key
// in bytes.
func GetSizeInBytes(key string) uint { return v.GetSizeInBytes(key) }
@ -473,16 +513,16 @@ func (v *Viper) GetSizeInBytes(key string) uint {
return parseSizeInBytes(sizeStr)
}
// Takes a single key and marshals it into a Struct
func MarshalKey(key string, rawVal interface{}) error { return v.MarshalKey(key, rawVal) }
func (v *Viper) MarshalKey(key string, rawVal interface{}) error {
// 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 {
return mapstructure.Decode(v.Get(key), rawVal)
}
// Marshals the config into a Struct. Make sure that the tags
// Unmarshals the config into a Struct. Make sure that the tags
// on the fields of the structure are properly set.
func Marshal(rawVal interface{}) error { return v.Marshal(rawVal) }
func (v *Viper) Marshal(rawVal interface{}) error {
func Unmarshal(rawVal interface{}) error { return v.Unmarshal(rawVal) }
func (v *Viper) Unmarshal(rawVal interface{}) error {
err := mapstructure.WeakDecode(v.AllSettings(), rawVal)
if err != nil {
@ -748,19 +788,19 @@ func (v *Viper) ReadInConfig() error {
v.config = make(map[string]interface{})
return v.marshalReader(bytes.NewReader(file), v.config)
return v.unmarshalReader(bytes.NewReader(file), v.config)
}
func ReadConfig(in io.Reader) error { return v.ReadConfig(in) }
func (v *Viper) ReadConfig(in io.Reader) error {
v.config = make(map[string]interface{})
return v.marshalReader(in, v.config)
return v.unmarshalReader(in, v.config)
}
// func ReadBufConfig(buf *bytes.Buffer) error { return v.ReadBufConfig(buf) }
// func (v *Viper) ReadBufConfig(buf *bytes.Buffer) error {
// v.config = make(map[string]interface{})
// return v.marshalReader(buf, v.config)
// return v.unmarshalReader(buf, v.config)
// }
// Attempts to get configuration from a remote source
@ -783,14 +823,14 @@ func (v *Viper) WatchRemoteConfig() error {
return nil
}
// Marshall a Reader into a map
// Unmarshall a Reader into a map
// Should probably be an unexported function
func marshalReader(in io.Reader, c map[string]interface{}) error {
return v.marshalReader(in, c)
func unmarshalReader(in io.Reader, c map[string]interface{}) error {
return v.unmarshalReader(in, c)
}
func (v *Viper) marshalReader(in io.Reader, c map[string]interface{}) error {
return marshallConfigReader(in, c, v.getConfigType())
func (v *Viper) unmarshalReader(in io.Reader, c map[string]interface{}) error {
return unmarshallConfigReader(in, c, v.getConfigType())
}
func (v *Viper) insensitiviseMaps() {
@ -823,7 +863,7 @@ func (v *Viper) getRemoteConfig(provider *defaultRemoteProvider) (map[string]int
if err != nil {
return nil, err
}
err = v.marshalReader(reader, v.kvstore)
err = v.unmarshalReader(reader, v.kvstore)
return v.kvstore, err
}
@ -845,7 +885,7 @@ func (v *Viper) watchRemoteConfig(provider *defaultRemoteProvider) (map[string]i
if err != nil {
return nil, err
}
err = v.marshalReader(reader, v.kvstore)
err = v.unmarshalReader(reader, v.kvstore)
return v.kvstore, err
}

30
viper_test.go
View file

@ -78,23 +78,23 @@ func initConfigs() {
Reset()
SetConfigType("yaml")
r := bytes.NewReader(yamlExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
SetConfigType("json")
r = bytes.NewReader(jsonExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
SetConfigType("properties")
r = bytes.NewReader(propertiesExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
SetConfigType("toml")
r = bytes.NewReader(tomlExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
SetConfigType("json")
remote := bytes.NewReader(remoteExample)
marshalReader(remote, v.kvstore)
unmarshalReader(remote, v.kvstore)
}
func initYAML() {
@ -102,7 +102,7 @@ func initYAML() {
SetConfigType("yaml")
r := bytes.NewReader(yamlExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
}
func initJSON() {
@ -110,7 +110,7 @@ func initJSON() {
SetConfigType("json")
r := bytes.NewReader(jsonExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
}
func initProperties() {
@ -118,7 +118,7 @@ func initProperties() {
SetConfigType("properties")
r := bytes.NewReader(propertiesExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
}
func initTOML() {
@ -126,7 +126,7 @@ func initTOML() {
SetConfigType("toml")
r := bytes.NewReader(tomlExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
}
// make directories for testing
@ -201,11 +201,11 @@ func TestDefault(t *testing.T) {
assert.Equal(t, 45, Get("age"))
}
func TestMarshalling(t *testing.T) {
func TestUnmarshalling(t *testing.T) {
SetConfigType("yaml")
r := bytes.NewReader(yamlExample)
marshalReader(r, v.config)
unmarshalReader(r, v.config)
assert.True(t, InConfig("name"))
assert.False(t, InConfig("state"))
assert.Equal(t, "steve", Get("name"))
@ -266,7 +266,7 @@ func TestRemotePrecedence(t *testing.T) {
remote := bytes.NewReader(remoteExample)
assert.Equal(t, "0001", Get("id"))
marshalReader(remote, v.kvstore)
unmarshalReader(remote, v.kvstore)
assert.Equal(t, "0001", Get("id"))
assert.NotEqual(t, "cronut", Get("type"))
assert.Equal(t, "remote", Get("newkey"))
@ -378,7 +378,7 @@ func TestRecursiveAliases(t *testing.T) {
RegisterAlias("Roo", "baz")
}
func TestMarshal(t *testing.T) {
func TestUnmarshal(t *testing.T) {
SetDefault("port", 1313)
Set("name", "Steve")
@ -389,7 +389,7 @@ func TestMarshal(t *testing.T) {
var C config
err := Marshal(&C)
err := Unmarshal(&C)
if err != nil {
t.Fatalf("unable to decode into struct, %v", err)
}
@ -397,7 +397,7 @@ func TestMarshal(t *testing.T) {
assert.Equal(t, &C, &config{Name: "Steve", Port: 1313})
Set("port", 1234)
err = Marshal(&C)
err = Unmarshal(&C)
if err != nil {
t.Fatalf("unable to decode into struct, %v", err)
}