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viper.go
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viper.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.
// Viper is a application configuration system.
// It believes that applications can be configured a variety of ways
// via flags, ENVIRONMENT variables, configuration files retrieved
// from the file system, or a remote key/value store.
// Each item takes precedence over the item below it:
// overrides
// flag
// env
// config
// key/value store
// default
package viper
import (
"bytes"
"encoding/csv"
"encoding/json"
"fmt"
"io"
"log"
"os"
"path/filepath"
"reflect"
"strings"
"time"
yaml "gopkg.in/yaml.v2"
"github.com/fsnotify/fsnotify"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/hcl/printer"
"github.com/magiconair/properties"
"github.com/mitchellh/mapstructure"
toml "github.com/pelletier/go-toml"
"github.com/spf13/afero"
"github.com/spf13/cast"
jww "github.com/spf13/jwalterweatherman"
"github.com/spf13/pflag"
)
// ConfigMarshalError happens when failing to marshal the configuration.
type ConfigMarshalError struct {
err error
}
// Error returns the formatted configuration error.
func (e ConfigMarshalError) Error() string {
return fmt.Sprintf("While marshaling config: %s", e.err.Error())
}
var v *Viper
type RemoteResponse struct {
Value []byte
Error error
}
func init() {
v = New()
}
type remoteConfigFactory interface {
Get(rp RemoteProvider) (io.Reader, error)
Watch(rp RemoteProvider) (io.Reader, error)
WatchChannel(rp RemoteProvider) (<-chan *RemoteResponse, chan bool)
}
// RemoteConfig is optional, see the remote package
var RemoteConfig remoteConfigFactory
// UnsupportedConfigError denotes encountering an unsupported
// configuration filetype.
type UnsupportedConfigError string
// Error returns the formatted configuration error.
func (str UnsupportedConfigError) Error() string {
return fmt.Sprintf("Unsupported Config Type %q", string(str))
}
// UnsupportedRemoteProviderError denotes encountering an unsupported remote
// provider. Currently only etcd and Consul are supported.
type UnsupportedRemoteProviderError string
// Error returns the formatted remote provider error.
func (str UnsupportedRemoteProviderError) Error() string {
return fmt.Sprintf("Unsupported Remote Provider Type %q", string(str))
}
// RemoteConfigError denotes encountering an error while trying to
// pull the configuration from the remote provider.
type RemoteConfigError string
// Error returns the formatted remote provider error
func (rce RemoteConfigError) Error() string {
return fmt.Sprintf("Remote Configurations Error: %s", string(rce))
}
// ConfigFileNotFoundError denotes failing to find configuration file.
type ConfigFileNotFoundError struct {
name, locations string
}
// Error returns the formatted configuration error.
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
// to the source's priority.
// The priority of the sources is the following:
// 1. overrides
// 2. flags
// 3. env. variables
// 4. config file
// 5. key/value store
// 6. defaults
//
// For example, if values from the following sources were loaded:
//
// Defaults : {
// "secret": "",
// "user": "default",
// "endpoint": "https://localhost"
// }
// Config : {
// "user": "root"
// "secret": "defaultsecret"
// }
// Env : {
// "secret": "somesecretkey"
// }
//
// The resulting config will have the following values:
//
// {
// "secret": "somesecretkey",
// "user": "root",
// "endpoint": "https://localhost"
// }
type Viper struct {
// Delimiter that separates a list of keys
// used to access a nested value in one go
keyDelim string
// A set of paths to look for the config file in
configPaths []string
// The filesystem to read config from.
fs afero.Fs
// A set of remote providers to search for the configuration
remoteProviders []*defaultRemoteProvider
// Name of file to look for inside the path
configName string
configFile string
configType string
envPrefix string
automaticEnvApplied bool
envKeyReplacer *strings.Replacer
config map[string]interface{}
override map[string]interface{}
defaults map[string]interface{}
kvstore map[string]interface{}
pflags map[string]FlagValue
env map[string]string
aliases map[string]string
typeByDefValue bool
// Store read properties on the object so that we can write back in order with comments.
// This will only be used if the configuration read is a properties file.
properties *properties.Properties
onConfigChange func(fsnotify.Event)
}
// New returns an initialized Viper instance.
func New() *Viper {
v := new(Viper)
v.keyDelim = "."
v.configName = "config"
v.fs = afero.NewOsFs()
v.config = make(map[string]interface{})
v.override = make(map[string]interface{})
v.defaults = make(map[string]interface{})
v.kvstore = make(map[string]interface{})
v.pflags = make(map[string]FlagValue)
v.env = make(map[string]string)
v.aliases = make(map[string]string)
v.typeByDefValue = false
return v
}
// Intended for testing, will reset all to default settings.
// In the public interface for the viper package so applications
// can use it in their testing as well.
func Reset() {
v = New()
SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl"}
SupportedRemoteProviders = []string{"etcd", "consul"}
}
type defaultRemoteProvider struct {
provider string
endpoint string
path string
secretKeyring string
}
func (rp defaultRemoteProvider) Provider() string {
return rp.provider
}
func (rp defaultRemoteProvider) Endpoint() string {
return rp.endpoint
}
func (rp defaultRemoteProvider) Path() string {
return rp.path
}
func (rp defaultRemoteProvider) SecretKeyring() string {
return rp.secretKeyring
}
// RemoteProvider stores the configuration necessary
// to connect to a remote key/value store.
// Optional secretKeyring to unencrypt encrypted values
// can be provided.
type RemoteProvider interface {
Provider() string
Endpoint() string
Path() string
SecretKeyring() string
}
// SupportedExts are universally supported extensions.
var SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl"}
// SupportedRemoteProviders are universally supported remote providers.
var SupportedRemoteProviders = []string{"etcd", "consul"}
func OnConfigChange(run func(in fsnotify.Event)) { v.OnConfigChange(run) }
func (v *Viper) OnConfigChange(run func(in fsnotify.Event)) {
v.onConfigChange = run
}
func WatchConfig() { v.WatchConfig() }
func (v *Viper) WatchConfig() {
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)
return
}
configFile := filepath.Clean(filename)
configDir, _ := filepath.Split(configFile)
done := make(chan bool)
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 err := <-watcher.Errors:
log.Println("error:", err)
}
}
}()
watcher.Add(configDir)
<-done
}()
}
// SetConfigFile explicitly defines the path, name and extension of the config file.
// Viper will use this and not check any of the config paths.
func SetConfigFile(in string) { v.SetConfigFile(in) }
func (v *Viper) SetConfigFile(in string) {
if in != "" {
v.configFile = in
}
}
// SetEnvPrefix defines a prefix that ENVIRONMENT variables will use.
// E.g. if your prefix is "spf", the env registry will look for env
// variables that start with "SPF_".
func SetEnvPrefix(in string) { v.SetEnvPrefix(in) }
func (v *Viper) SetEnvPrefix(in string) {
if in != "" {
v.envPrefix = in
}
}
func (v *Viper) mergeWithEnvPrefix(in string) string {
if v.envPrefix != "" {
return strings.ToUpper(v.envPrefix + "_" + in)
}
return strings.ToUpper(in)
}
// 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)
// 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 {
if v.envKeyReplacer != nil {
key = v.envKeyReplacer.Replace(key)
}
return os.Getenv(key)
}
// ConfigFileUsed returns the file used to populate the config registry.
func ConfigFileUsed() string { return v.ConfigFileUsed() }
func (v *Viper) ConfigFileUsed() string { return v.configFile }
// AddConfigPath adds a path for Viper to search for the config file in.
// Can be called multiple times to define multiple search paths.
func AddConfigPath(in string) { v.AddConfigPath(in) }
func (v *Viper) AddConfigPath(in string) {
if in != "" {
absin := absPathify(in)
jww.INFO.Println("adding", absin, "to paths to search")
if !stringInSlice(absin, v.configPaths) {
v.configPaths = append(v.configPaths, absin)
}
}
}
// AddRemoteProvider adds a remote configuration source.
// Remote Providers are searched in the order they are added.
// provider is a string value, "etcd" or "consul" are currently supported.
// endpoint is the url. etcd requires http://ip:port consul requires ip:port
// path is the path in the k/v store to retrieve configuration
// To retrieve a config file called myapp.json from /configs/myapp.json
// you should set path to /configs and set config name (SetConfigName()) to
// "myapp"
func AddRemoteProvider(provider, endpoint, path string) error {
return v.AddRemoteProvider(provider, endpoint, path)
}
func (v *Viper) AddRemoteProvider(provider, endpoint, path string) error {
if !stringInSlice(provider, SupportedRemoteProviders) {
return UnsupportedRemoteProviderError(provider)
}
if provider != "" && endpoint != "" {
jww.INFO.Printf("adding %s:%s to remote provider list", provider, endpoint)
rp := &defaultRemoteProvider{
endpoint: endpoint,
provider: provider,
path: path,
}
if !v.providerPathExists(rp) {
v.remoteProviders = append(v.remoteProviders, rp)
}
}
return nil
}
// AddSecureRemoteProvider adds a remote configuration source.
// Secure Remote Providers are searched in the order they are added.
// provider is a string value, "etcd" or "consul" are currently supported.
// endpoint is the url. etcd requires http://ip:port consul requires ip:port
// secretkeyring is the filepath to your openpgp secret keyring. e.g. /etc/secrets/myring.gpg
// path is the path in the k/v store to retrieve configuration
// To retrieve a config file called myapp.json from /configs/myapp.json
// you should set path to /configs and set config name (SetConfigName()) to
// "myapp"
// Secure Remote Providers are implemented with github.com/xordataexchange/crypt
func AddSecureRemoteProvider(provider, endpoint, path, secretkeyring string) error {
return v.AddSecureRemoteProvider(provider, endpoint, path, secretkeyring)
}
func (v *Viper) AddSecureRemoteProvider(provider, endpoint, path, secretkeyring string) error {
if !stringInSlice(provider, SupportedRemoteProviders) {
return UnsupportedRemoteProviderError(provider)
}
if provider != "" && endpoint != "" {
jww.INFO.Printf("adding %s:%s to remote provider list", provider, endpoint)
rp := &defaultRemoteProvider{
endpoint: endpoint,
provider: provider,
path: path,
secretKeyring: secretkeyring,
}
if !v.providerPathExists(rp) {
v.remoteProviders = append(v.remoteProviders, rp)
}
}
return nil
}
func (v *Viper) providerPathExists(p *defaultRemoteProvider) bool {
for _, y := range v.remoteProviders {
if reflect.DeepEqual(y, p) {
return true
}
}
return false
}
// searchMap recursively searches for a value for path in source map.
// Returns nil if not found.
// Note: This assumes that the path entries and map keys are lower cased.
func (v *Viper) searchMap(source map[string]interface{}, path []string) interface{} {
if len(path) == 0 {
return source
}
next, ok := source[path[0]]
if ok {
// Fast path
if len(path) == 1 {
return next
}
// Nested case
switch next.(type) {
case map[interface{}]interface{}:
return v.searchMap(cast.ToStringMap(next), path[1:])
case map[string]interface{}:
// Type assertion is safe here since it is only reached
// if the type of `next` is the same as the type being asserted
return v.searchMap(next.(map[string]interface{}), path[1:])
default:
// got a value but nested key expected, return "nil" for not found
return nil
}
}
return nil
}
// searchMapWithPathPrefixes recursively searches for a value for path in source map.
//
// While searchMap() considers each path element as a single map key, this
// function searches for, and prioritizes, merged path elements.
// e.g., if in the source, "foo" is defined with a sub-key "bar", and "foo.bar"
// is also defined, this latter value is returned for path ["foo", "bar"].
//
// This should be useful only at config level (other maps may not contain dots
// in their keys).
//
// Note: This assumes that the path entries and map keys are lower cased.
func (v *Viper) searchMapWithPathPrefixes(source map[string]interface{}, path []string) interface{} {
if len(path) == 0 {
return source
}
// search for path prefixes, starting from the longest one
for i := len(path); i > 0; i-- {
prefixKey := strings.ToLower(strings.Join(path[0:i], v.keyDelim))
next, ok := source[prefixKey]
if ok {
// Fast path
if i == len(path) {
return next
}
// Nested case
var val interface{}
switch next.(type) {
case map[interface{}]interface{}:
val = v.searchMapWithPathPrefixes(cast.ToStringMap(next), path[i:])
case map[string]interface{}:
// Type assertion is safe here since it is only reached
// if the type of `next` is the same as the type being asserted
val = v.searchMapWithPathPrefixes(next.(map[string]interface{}), path[i:])
default:
// got a value but nested key expected, do nothing and look for next prefix
}
if val != nil {
return val
}
}
}
// not found
return nil
}
// isPathShadowedInDeepMap makes sure the given path is not shadowed somewhere
// on its path in the map.
// e.g., if "foo.bar" has a value in the given map, it “shadows”
// "foo.bar.baz" in a lower-priority map
func (v *Viper) isPathShadowedInDeepMap(path []string, m map[string]interface{}) string {
var parentVal interface{}
for i := 1; i < len(path); i++ {
parentVal = v.searchMap(m, path[0:i])
if parentVal == nil {
// not found, no need to add more path elements
return ""
}
switch parentVal.(type) {
case map[interface{}]interface{}:
continue
case map[string]interface{}:
continue
default:
// parentVal is a regular value which shadows "path"
return strings.Join(path[0:i], v.keyDelim)
}
}
return ""
}
// isPathShadowedInFlatMap makes sure the given path is not shadowed somewhere
// in a sub-path of the map.
// e.g., if "foo.bar" has a value in the given map, it “shadows”
// "foo.bar.baz" in a lower-priority map
func (v *Viper) isPathShadowedInFlatMap(path []string, mi interface{}) string {
// unify input map
var m map[string]interface{}
switch mi.(type) {
case map[string]string, map[string]FlagValue:
m = cast.ToStringMap(mi)
default:
return ""
}
// scan paths
var parentKey string
for i := 1; i < len(path); i++ {
parentKey = strings.Join(path[0:i], v.keyDelim)
if _, ok := m[parentKey]; ok {
return parentKey
}
}
return ""
}
// isPathShadowedInAutoEnv makes sure the given path is not shadowed somewhere
// in the environment, when automatic env is on.
// e.g., if "foo.bar" has a value in the environment, it “shadows”
// "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 != "" {
return parentKey
}
}
return ""
}
// 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
}
// GetViper gets the global Viper instance.
func GetViper() *Viper {
return v
}
// Get can retrieve any value given the key to use.
// Get is case-insensitive for a key.
// Get has the behavior of returning the value associated with the first
// place from where it is set. Viper will check in the following order:
// override, flag, env, config file, key/value store, default
//
// Get returns an interface. For a specific value use one of the Get____ methods.
func Get(key string) interface{} { return v.Get(key) }
func (v *Viper) Get(key string) interface{} {
lcaseKey := strings.ToLower(key)
val := v.find(lcaseKey)
if val == nil {
return nil
}
if v.typeByDefValue {
// TODO(bep) this branch isn't covered by a single test.
valType := val
path := strings.Split(lcaseKey, v.keyDelim)
defVal := v.searchMap(v.defaults, path)
if defVal != nil {
valType = defVal
}
switch valType.(type) {
case bool:
return cast.ToBool(val)
case string:
return cast.ToString(val)
case int64, int32, int16, int8, int:
return cast.ToInt(val)
case float64, float32:
return cast.ToFloat64(val)
case time.Time:
return cast.ToTime(val)
case time.Duration:
return cast.ToDuration(val)
case []string:
return cast.ToStringSlice(val)
}
}
return val
}
// Sub returns new Viper instance representing a sub tree of this instance.
// Sub is case-insensitive for a key.
func Sub(key string) *Viper { return v.Sub(key) }
func (v *Viper) Sub(key string) *Viper {
subv := New()
data := v.Get(key)
if data == nil {
return nil
}
if reflect.TypeOf(data).Kind() == reflect.Map {
subv.config = cast.ToStringMap(data)
return subv
}
return nil
}
// GetString returns the value associated with the key as a string.
func GetString(key string) string { return v.GetString(key) }
func (v *Viper) GetString(key string) string {
return cast.ToString(v.Get(key))
}
// GetBool returns the value associated with the key as a boolean.
func GetBool(key string) bool { return v.GetBool(key) }
func (v *Viper) GetBool(key string) bool {
return cast.ToBool(v.Get(key))
}
// GetInt returns the value associated with the key as an integer.
func GetInt(key string) int { return v.GetInt(key) }
func (v *Viper) GetInt(key string) int {
return cast.ToInt(v.Get(key))
}
// GetInt32 returns the value associated with the key as an integer.
func GetInt32(key string) int32 { return v.GetInt32(key) }
func (v *Viper) GetInt32(key string) int32 {
return cast.ToInt32(v.Get(key))
}
// GetInt64 returns the value associated with the key as an integer.
func GetInt64(key string) int64 { return v.GetInt64(key) }
func (v *Viper) GetInt64(key string) int64 {
return cast.ToInt64(v.Get(key))
}
// GetFloat64 returns the value associated with the key as a float64.
func GetFloat64(key string) float64 { return v.GetFloat64(key) }
func (v *Viper) GetFloat64(key string) float64 {
return cast.ToFloat64(v.Get(key))
}
// GetTime returns the value associated with the key as time.
func GetTime(key string) time.Time { return v.GetTime(key) }
func (v *Viper) GetTime(key string) time.Time {
return cast.ToTime(v.Get(key))
}
// GetDuration returns the value associated with the key as a duration.
func GetDuration(key string) time.Duration { return v.GetDuration(key) }
func (v *Viper) GetDuration(key string) time.Duration {
return cast.ToDuration(v.Get(key))
}
// GetStringSlice returns the value associated with the key as a slice of strings.
func GetStringSlice(key string) []string { return v.GetStringSlice(key) }
func (v *Viper) GetStringSlice(key string) []string {
return cast.ToStringSlice(v.Get(key))
}
// GetStringMap returns the value associated with the key as a map of interfaces.
func GetStringMap(key string) map[string]interface{} { return v.GetStringMap(key) }
func (v *Viper) GetStringMap(key string) map[string]interface{} {
return cast.ToStringMap(v.Get(key))
}
// GetStringMapString returns the value associated with the key as a map of strings.
func GetStringMapString(key string) map[string]string { return v.GetStringMapString(key) }
func (v *Viper) GetStringMapString(key string) map[string]string {
return cast.ToStringMapString(v.Get(key))
}
// GetStringMapStringSlice 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))
}
// GetSizeInBytes returns the size of the value associated with the given key
// in bytes.
func GetSizeInBytes(key string) uint { return v.GetSizeInBytes(key) }
func (v *Viper) GetSizeInBytes(key string) uint {
sizeStr := cast.ToString(v.Get(key))
return parseSizeInBytes(sizeStr)
}
// UnmarshalKey takes a single key and unmarshals it into a Struct.
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
}
v.insensitiviseMaps()
return nil
}
// 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{}, 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
}
v.insensitiviseMaps()
return nil
}
// defaultDecoderConfig returns default mapsstructure.DecoderConfig with suppot
// of time.Duration values & string slices
func defaultDecoderConfig(output interface{}, opts ...DecoderConfigOption) *mapstructure.DecoderConfig {
c := &mapstructure.DecoderConfig{
Metadata: nil,
Result: output,
WeaklyTypedInput: true,
DecodeHook: mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToSliceHookFunc(","),
),
}
for _, opt := range opts {
opt(c)
}
return c
}
// A wrapper around mapstructure.Decode that mimics the WeakDecode functionality
func decode(input interface{}, config *mapstructure.DecoderConfig) error {
decoder, err := mapstructure.NewDecoder(config)
if err != nil {
return err
}
return decoder.Decode(input)
}
// UnmarshalExact unmarshals the config into a Struct, erroring if a field is nonexistent
// in the destination struct.
func (v *Viper) UnmarshalExact(rawVal interface{}) error {
config := defaultDecoderConfig(rawVal)
config.ErrorUnused = true
err := decode(v.AllSettings(), config)
if err != nil {
return err
}
v.insensitiviseMaps()
return nil
}
// BindPFlags binds a full flag set to the configuration, using each flag's long
// name as the config key.
func BindPFlags(flags *pflag.FlagSet) error { return v.BindPFlags(flags) }
func (v *Viper) BindPFlags(flags *pflag.FlagSet) error {
return v.BindFlagValues(pflagValueSet{flags})
}
// BindPFlag binds a specific key to a pflag (as used by cobra).
// Example (where serverCmd is a Cobra instance):
//
// serverCmd.Flags().Int("port", 1138, "Port to run Application server on")
// Viper.BindPFlag("port", serverCmd.Flags().Lookup("port"))
//
func BindPFlag(key string, flag *pflag.Flag) error { return v.BindPFlag(key, flag) }
func (v *Viper) BindPFlag(key string, flag *pflag.Flag) error {
return v.BindFlagValue(key, pflagValue{flag})
}
// BindFlagValues binds a full FlagValue set to the configuration, using each flag's long
// name as the config key.
func BindFlagValues(flags FlagValueSet) error { return v.BindFlagValues(flags) }
func (v *Viper) BindFlagValues(flags FlagValueSet) (err error) {
flags.VisitAll(func(flag FlagValue) {
if err = v.BindFlagValue(flag.Name(), flag); err != nil {
return
}
})
return nil
}
// BindFlagValue binds a specific key to a FlagValue.
// Example (where serverCmd is a Cobra instance):
//
// serverCmd.Flags().Int("port", 1138, "Port to run Application server on")
// Viper.BindFlagValue("port", serverCmd.Flags().Lookup("port"))
//
func BindFlagValue(key string, flag FlagValue) error { return v.BindFlagValue(key, flag) }
func (v *Viper) BindFlagValue(key string, flag FlagValue) error {
if flag == nil {
return fmt.Errorf("flag for %q is nil", key)
}
v.pflags[strings.ToLower(key)] = flag
return nil
}
// BindEnv binds a Viper key to a ENV variable.
// ENV variables are case sensitive.
// If only a key is provided, it will use the env key matching the key, uppercased.
// EnvPrefix will be used when set when env name is not provided.
func BindEnv(input ...string) error { return v.BindEnv(input...) }
func (v *Viper) BindEnv(input ...string) error {
var key, envkey string
if len(input) == 0 {
return fmt.Errorf("BindEnv missing key to bind to")
}
key = strings.ToLower(input[0])
if len(input) == 1 {
envkey = v.mergeWithEnvPrefix(key)
} else {
envkey = input[1]
}
v.env[key] = envkey
return nil
}
// Given a key, find the value.
// Viper will check in the following order:
// flag, env, config file, key/value store, default.
// Viper will check to see if an alias exists first.
// Note: this assumes a lower-cased key given.
func (v *Viper) find(lcaseKey string) interface{} {
var (
val interface{}
exists bool
path = strings.Split(lcaseKey, v.keyDelim)
nested = len(path) > 1
)
// compute the path through the nested maps to the nested value
if nested && v.isPathShadowedInDeepMap(path, castMapStringToMapInterface(v.aliases)) != "" {
return nil
}
// if the requested key is an alias, then return the proper key
lcaseKey = v.realKey(lcaseKey)
path = strings.Split(lcaseKey, v.keyDelim)
nested = len(path) > 1
// Set() override first
val = v.searchMap(v.override, path)
if val != nil {
return val
}
if nested && v.isPathShadowedInDeepMap(path, v.override) != "" {
return nil
}
// PFlag override next
flag, exists := v.pflags[lcaseKey]
if exists && flag.HasChanged() {
switch flag.ValueType() {
case "int", "int8", "int16", "int32", "int64":
return cast.ToInt(flag.ValueString())
case "bool":
return cast.ToBool(flag.ValueString())
case "stringSlice":
s := strings.TrimPrefix(flag.ValueString(), "[")
s = strings.TrimSuffix(s, "]")
res, _ := readAsCSV(s)
return res
default:
return flag.ValueString()
}
}
if nested && v.isPathShadowedInFlatMap(path, v.pflags) != "" {
return nil
}
// Env override next
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 != "" {
return val
}
if nested && v.isPathShadowedInAutoEnv(path) != "" {
return nil
}
}
envkey, exists := v.env[lcaseKey]
if exists {
if val = v.getEnv(envkey); val != "" {
return val
}
}
if nested && v.isPathShadowedInFlatMap(path, v.env) != "" {
return nil
}
// Config file next
val = v.searchMapWithPathPrefixes(v.config, path)
if val != nil {
return val
}
if nested && v.isPathShadowedInDeepMap(path, v.config) != "" {
return nil
}
// K/V store next
val = v.searchMap(v.kvstore, path)
if val != nil {
return val
}