Viper is one of the most popular packages in the golang community. Aliases permit a single value to be referenced by multiple keys. Find, load, and unmarshal a configuration file in JSON, TOML, YAML, HCL, INI, envfile or Java properties formats. to an application. and easier to reuse (for the same reason). AddRemoteProvider(provider, endpoint, path), AddSecureRemoteProvider(provider, endpoint, path, secretkeyring), (v) AddRemoteProvider(provider, endpoint, path), (v) AddSecureRemoteProvider(provider, endpoint, path, secretkeyring), func AddRemoteProvider(provider, endpoint, path string) error, func AddSecureRemoteProvider(provider, endpoint, path, secretkeyring string) error, func AllSettings() map[string]interface{}, func BindFlagValue(key string, flag FlagValue) error, func BindFlagValues(flags FlagValueSet) error, func BindPFlag(key string, flag *pflag.Flag) error, func BindPFlags(flags *pflag.FlagSet) error, func GetDuration(key string) time.Duration, func GetStringMap(key string) map[string]interface{}, func GetStringMapString(key string) map[string]string, func GetStringMapStringSlice(key string) map[string][]string, func MergeConfigMap(cfg map[string]interface{}) error, func OnConfigChange(run func(in fsnotify.Event)), func RegisterAlias(alias string, key string), func SafeWriteConfigAs(filename string) error, func SetConfigPermissions(perm os.FileMode), func SetDefault(key string, value interface{}), func SetEnvKeyReplacer(r *strings.Replacer), func Unmarshal(rawVal interface{}, opts DecoderConfigOption) error, func UnmarshalExact(rawVal interface{}, opts DecoderConfigOption) error, func UnmarshalKey(key string, rawVal interface{}, opts DecoderConfigOption) error, func WriteConfigAs(filename string) error, func (faee ConfigFileAlreadyExistsError) Error() string, func (fnfe ConfigFileNotFoundError) Error() string, func (e ConfigMarshalError) Error() string, func (pe ConfigParseError) Error() string, func DecodeHook(hook mapstructure.DecodeHookFunc) DecoderConfigOption, func EnvKeyReplacer(r StringReplacer) Option, func IniLoadOptions(in ini.LoadOptions) Option, func (rce RemoteConfigError) Error() string, func (str UnsupportedConfigError) Error() string, func (str UnsupportedRemoteProviderError) Error() string, func NewWithOptions(opts Option) *Viper, func (v *Viper) AddRemoteProvider(provider, endpoint, path string) error, func (v *Viper) AddSecureRemoteProvider(provider, endpoint, path, secretkeyring string) error, func (v *Viper) AllSettings() map[string]interface{}, func (v *Viper) AllowEmptyEnv(allowEmptyEnv bool), func (v *Viper) BindEnv(input string) error, func (v *Viper) BindFlagValue(key string, flag FlagValue) error, func (v *Viper) BindFlagValues(flags FlagValueSet) (err error), func (v *Viper) BindPFlag(key string, flag *pflag.Flag) error, func (v *Viper) BindPFlags(flags *pflag.FlagSet) error, func (v *Viper) Get(key string) interface{}, func (v *Viper) GetDuration(key string) time.Duration, func (v *Viper) GetFloat64(key string) float64, func (v *Viper) GetInt32(key string) int32, func (v *Viper) GetInt64(key string) int64, func (v *Viper) GetIntSlice(key string) []int, func (v *Viper) GetSizeInBytes(key string) uint, func (v *Viper) GetString(key string) string, func (v *Viper) GetStringMap(key string) map[string]interface{}, func (v *Viper) GetStringMapString(key string) map[string]string, func (v *Viper) GetStringMapStringSlice(key string) map[string][]string, func (v *Viper) GetStringSlice(key string) []string, func (v *Viper) GetTime(key string) time.Time, func (v *Viper) GetUint16(key string) uint16, func (v *Viper) GetUint32(key string) uint32, func (v *Viper) GetUint64(key string) uint64, func (v *Viper) InConfig(key string) bool, func (v *Viper) MergeConfig(in io.Reader) error, func (v *Viper) MergeConfigMap(cfg map[string]interface{}) error, func (v *Viper) MustBindEnv(input string), func (v *Viper) OnConfigChange(run func(in fsnotify.Event)), func (v *Viper) ReadConfig(in io.Reader) error, func (v *Viper) RegisterAlias(alias string, key string), func (v *Viper) SafeWriteConfigAs(filename string) error, func (v *Viper) Set(key string, value interface{}), func (v *Viper) SetConfigPermissions(perm os.FileMode), func (v *Viper) SetDefault(key string, value interface{}), func (v *Viper) SetEnvKeyReplacer(r *strings.Replacer), func (v *Viper) SetTypeByDefaultValue(enable bool), func (v *Viper) Unmarshal(rawVal interface{}, opts DecoderConfigOption) error, func (v *Viper) UnmarshalExact(rawVal interface{}, opts DecoderConfigOption) error, func (v *Viper) UnmarshalKey(key string, rawVal interface{}, opts DecoderConfigOption) error, func (v *Viper) WatchRemoteConfig() error, func (v *Viper) WatchRemoteConfigOnChannel() error, func (v *Viper) WriteConfigAs(filename string) error, https://commandcenter.blogspot.com/2014/01/self-referential-functions-and-design.html, https://dave.cheney.net/2014/10/17/functional-options-for-friendly-apis, reading from JSON, TOML, YAML, HCL, envfile and Java properties config files, live watching and re-reading of config files (optional), reading from remote config systems (etcd or Consul), and watching changes. Connect and share knowledge within a single location that is structured and easy to search. // any approach to require this configuration into your program. Since, BindEnv can take more than one argument, each will represent environment variable names that bind to this key and will be taken in the specified order. Logger is a unified interface for various logging use cases and practices, including: Option configures Viper using the functional options paradigm popularized by Rob Pike and Dave Cheney. env vars). flags, or environment variables. Viper provides two Go interfaces to bind other flag systems if you dont use Pflags. If more than Simply tell the viper instance to watchConfig. In all of the examples above, they demonstrate using viper in its singleton For example, create a Consul key/value store key MY_CONSUL_KEY with value: Of course, you're allowed to use SecureRemoteProvider also. Viper does not fix the value when We have a list of the Best Online Courses to Learn Go and Golang to help you get started. None of the specific paths are required, but at least one path should be provided By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Errors if no predefined path. configuration filetype. Viper will use this and not check any of the config paths. package supports are mirrored as methods on a viper. Redistributable licenses place minimal restrictions on how software can be used, Package remote integrates the remote features of Viper. // A verbose series of information events. Viper will look for the ENV variable "ID". In Golang, struct data is converted into JSON and JSON data to string with Marshal () and Unmarshal () method. crypt defaults to etcd on http://127.0.0.1:4001. Teams. etc. see https://commandcenter.blogspot.com/2014/01/self-referential-functions-and-design.html and currently a single Viper instance only supports a single configuration file. Here, we use it to retrieve the value in the Operating Systems PATH environment variable. prefix. viper powered applications can read an update to a config file while running and example, if the following JSON file is loaded: Viper can access a nested field by passing a . When building a modern application, you dont want to worry about In the public interface for the viper package so applications Viper uses crypt to retrieve For example, an application might use multiple different cache stores for different purposes: We could pass the cache name to a module (eg. Please How is an ETF fee calculated in a trade that ends in less than a year? Make sure that the tags When you explicitly provide the ENV variable name (the second parameter), You may need to marshal all the settings held in viper into a string rather than write them to a file. Do new devs get fired if they can't solve a certain bug? type User struct { Id string `json:"id"` Name string `json:"name"` Password string `json:"password"` } // an instance of our User struct user := User {Id: "ID001", Name: "LanKa", Password: "123465"} convert instance ca . InConfig checks to see if the given key (or an alias) is in the config file. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? // contains filtered or unexported fields. A place where magic is studied and practiced? For individual flags, the BindPFlag() method provides this functionality. 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. Understand that viper, after all, is a tool to be used according to the requirement of the software being developed. Reset is intended for testing, will reset all to default settings. default values, but are overridden by configuration values retrieved from disk, yaml.Unmarshal YAML Golang . A: Viper is designed to be a companion Unmarshaljsonv. Viper has the ability to bind to flags. NewCache("cache1")), K/V store. can use it in their testing as well.
GitHub - spf13/viper: Go configuration with fangs It is commonly used for configuration files, but it is also used in data storage (e.g. Error returns the formatted remote provider error. MustBindEnv wraps BindEnv in a panic. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Find centralized, trusted content and collaborate around the technologies you use most. The Unmarshal function doesn't create and return Go objects , so we have to pass a reference to store the decoded content. Viper . Why are physically impossible and logically impossible concepts considered separate in terms of probability? Viper supports JSON, TOML, YAML, HCL, INI, envfile and Java Properties files. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Viper uses crypt to retrieve For backward compatibility reasons this is false by default. As mentioned, viper is a package that provides a complete configuration solution in a Go project. hook or something ? If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Asking for help, clarification, or responding to other answers. In order to provide the best experience when using multiple sources, the decision has been made to make all keys case insensitive. configuration values encrypted and have them automatically decrypted if you have where a configuration file is expected. The github link is - https://github.com/parthw/100-days-of-code/tree/main/golang/d6-cobra-viper-continued and the code is as follows. Support for JSON, TOML, YAML, env, command line, file, S3 etc. WatchConfig starts watching a config file for changes. Since most applications will want using SetEnvPrefix, you can tell Viper to use a prefix while reading from Go provides a minimal grammar for general-purpose programming with just 25 keywords. SetEnvPrefix defines a prefix that ENVIRONMENT variables will use. Like BindEnv, the value is not set when the binding method is called, but when application foundation needs. The name of It returns nil if a key cannot be found. SetConfigType sets the type of the configuration returned by the niljsonnil . Acidity of alcohols and basicity of amines. WriteConfigAs - writes the current viper configuration to the given filepath. // Loggers not supporting this level should fall back to Debug. Step 6 - Setup the HTML Templates. The Golang viper package uses .
AutomaticEnv is a powerful helper especially when combined with crypt has a command-line helper that you can use to put configurations in your Like BindEnv, the value is not set when the binding method is called, but when remote source, e.g. Viper is heading towards v2 and we would love to hear what you would like to see in it. Each item takes precedence over the item below it: Important: Viper configuration keys are case insensitive. SetTypeByDefaultValue enables or disables the inference of a key value's Error returns the formatted error when configuration already exists. NewCache("cache1")), WriteConfig writes the current configuration to a file. Interestingly, viper also provides the feature of unmarshalling of values from configuration files to Go types such as struct, map, and so on. By default, the go-yaml library converts 'map fields' into map [string]interface {}. Here is a quick example of how to unmarshal with viper in Go: Note that the marshalling features are typically provided by the package of the file format we want to marshall. Is Go able to unmarshal to map[string][]interface{}? There is no configuration or You can Viper is a complete configuration solution for Go applications including 12-Factor apps . datastore.metric become undefined, they are shadowed by the higher-priority Currently only etcd and Consul are supported.
CRUD in Golang REST API with Mux & GORM - Comprehensive Guide There has been several attempts to implement case sensitivity, but unfortunately it's not that trivial. panic. Get can retrieve any value given the key to use. For example, if values from the following sources were loaded: The resulting config will have the following values: Note: Vipers are not safe for concurrent Get() and Set() operations. To check if a given key exists, the IsSet() method and pass it to a module. UnsupportedRemoteProviderError denotes encountering an unsupported remote Learn more about Teams as used in the Cobra library. rest are the name of the environment variables to bind to this key. Both BindEnv and AutomaticEnv will use this Viper will automatically assume that the ENV variable matches the following format: prefix + "_" + the key name in ALL CAPS.