and key/value stores, searching in one of the defined paths. init() function. value if its not found. To check if a given key exists, the IsSet() method This is a very simple example on how to implement this interface: Once your flag set implements this interface, you can simply tell Viper to bind it: To enable remote support in Viper, do a blank import of the viper/remote Unmarshal15Golang You can handle the specific case where no config file is found like this: NOTE [since 1.6]: You can also have a file without an extension and specify the format programmaticaly. WriteConfig - writes the current viper configuration to the predefined path, if exists. Errors if no predefined path. ConfigFileUsed returns the file used to populate the config registry. to use a single central repository for their configuration, the viper package independently, together they make a powerful pair to handle much of your Do new devs get fired if they can't solve a certain bug? viper viper viper key viper WriteConf . Viper can access array indices by using numbers in the path. Connect and share knowledge within a single location that is structured and easy to search. GetIntSlice returns the value associated with the key as a slice of int values. provides this. Sample app.env file. All of the functions that viper it is accessed. To learn more, see our tips on writing great answers. // any approach to require this configuration into your program. Viper provides a mechanism to try to ensure that ENV variables are unique. Get is case-insensitive for a key. Many Go projects are built using Viper including: Note: Viper uses Go Modules to manage dependencies. ENV variables are case sensitive. the BindEnv is called. Each will The name of A good configuration system will support default values. E.g. Where does this (supposedly) Gibson quote come from? Like BindEnv, the value is not set when the binding method is called, but when Learn more about Teams It needs to uppercased to be "exported" for Unmarshal to decode the value into the struct. SetConfigFile explicitly defines the path, name and extension of the config file. Will not overwrite the given file, if it exists. Useful for mapping an environmental variable to a key that does yaml.v3yamlviperyamlYAML.yaml.v3 yaml viper yaml YAML . RemoteConfigError denotes encountering an error while trying to K/V store. The JSON parsing and generating JSON data is easily available in many programming languages. How can we prove that the supernatural or paranormal doesn't exist? example, if the following JSON file is loaded: Viper can access a nested field by passing a . You can also create many different vipers for use in your application. This is a very simple example on how to implement this interface: Once your flag implements this interface, you can simply tell Viper to bind it: FlagValueSet represents a group of flags. datastore.metric.port are already defined (and may be overridden). ( https://youtu.be/SSRIn5DAmyw ) Time to understand how to create a fantastic configuration for i. also implement your own required configuration source and feed it to viper. This file maintains the list of packages used in the current project. Every capability of viper may not be required at the moment, but that should not stop one from using some of its features. Will overwrite the given file, if it exists. If there is an error binding an environment variable, MustBindEnv will use viper to unmarshall json string to struct in golang? Go jsonUnmarshalnil . I am able to fetch the data using viper.AllSettings() but not by unmarshal. 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 . In addition to covering the most popular programming languages today, we publish reviews and round-ups of developer tools that help devs reduce the time and money spent developing, maintaining, and debugging their applications. to the source's priority. Optionally you can provide a function for Viper to run each time a change occurs. In this video tutorial we are going to look at the Viper library that allows for Go application configuration over a .env file or the standard environment va. configuration level. This is already available in Viper using mapstructure decode hooks. The Go module system was introduced in Go 1.11 and is the official dependency management Viper does not default to any configuration search paths leaving defaults decision Asking for help, clarification, or responding to other answers. By default empty environment variables are considered unset and will fall back to You can also bind an existing set of pflags (pflag.FlagSet): The use of pflag in Viper does not preclude When you explicitly provide the ENV variable name (the second parameter), In order to provide the best experience when using multiple sources, the decision has been made to make all keys case insensitive. Here is a quick example of how to unmarshal with viper in Go: type configType struct { InstallAt string Version string StaticPath string } var config configType err := viper.Unmarshal(&config) if err != nil { fmt.Println("Unmarshalling failed!") . This enables 12 factor One important thing to recognize when working with ENV variables is that the When working with multiple vipers, it is up to the user to keep track of the MergeInConfig merges a new configuration with an existing config. The viper library, in this respect, can entirely replace the flag package, which provides provisions for developing UNIX systems, such as command line utilities. Developers may do so using the following Go code example: Note that, in the function main(), we used viper.BindEnv to bind a viper key to the environment variable called PATH. New returns an initialized Viper instance. // A verbose series of information events. Viper supports JSON, TOML, YAML, HCL, INI, envfile and Java Properties files. Make it easy to tell the difference between when a user has provided a command line or config file which is the same as the default. Viper provides two Go interfaces to bind other flag systems if you dont use Pflags. What is a word for the arcane equivalent of a monastery? 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. delimited path of keys: This obeys the precedence rules established above; the search for the path JSON merupakan subset dari javascript.. Go menyediakan package encoding/json yang berisikan banyak fungsi untuk kebutuhan operasi json.. Pada chapter ini, kita akan belajar cara untuk konverstri string yang berbentuk json menjadi objek Go, dan sebaliknya. JSONTOMLYAMLHCLenvfile Java . It supports: setting defaults. . Will not overwrite the current config file, if it exists. IsSet checks to see if the key has been set in any of the data locations. Not the answer you're looking for? I am Amit Shekhar, a mentor helping developers in getting high-paying tech jobs.. It is similar to a singleton. reading from JSON, TOML, YAML, HCL, envfile and Java properties config files. It needs to uppercased to be "exported" for Unmarshal to decode the value into the struct. AddRemoteProvider adds a remote configuration source. treats ENV variables as case sensitive. Viper is one of the most popular packages in the golang community. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Thanks, thanks! In Viper, there are a few ways to get a value depending on the values type. 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. It is designed to work within an application, and can handle all types of configuration needs Why are physically impossible and logically impossible concepts considered separate in terms of probability? Since the json unmarshal function is external, it can only see exportable fields. to bind a set of flags to viper. yaml.Unmarshal YAML Golang . value will be read each time it is accessed. Get can retrieve any value given the key to use. and pass it to a module. Marshal & Unmarshal in golang. You can handle the specific case where no config file is found like this: NOTE [since 1.6]: You can also have a file without an extension and specify the format programmaticaly. ReadConfig will read a configuration file, setting existing keys to nil if the NewCache("cache1")), the environment variables. if your prefix is "spf", the env registry will look for env TechnologyAdvice does not include all companies or all types of products available in the marketplace. Package remote integrates the remote features of Viper. In this project and the upcoming series, I'll use Gin Gonic as my web framework since it has a performance that is 40 times faster compared to other web frameworks. It is a cleaner, lighter alternative to spf13/viper with better abstractions and extensibility and far fewer dependencies.. koanf v2 has modules (Providers) for reading configuration from a variety of sources such as files, command line flags, environment variables, Vault, and S3 and . exl - Excel binding to struct written in Go. https://dave.cheney.net/2014/10/17/functional-options-for-friendly-apis. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Will overwrite the current config file, if it exists. have its own unique set of configurations and values. "json". "myapp", AddSecureRemoteProvider adds a remote configuration source. place from where it is set. Viper will automatically assume that the ENV variable matches the following format: prefix + "_" + the key name in ALL CAPS. The best way to do this is to initialize the folder with git init. 6. defaults. on the fields of the structure are properly set. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? WriteConfigAs - writes the current viper configuration to the given filepath. Teams. We also tell Viper the type of the config file . Installing Viper. Just to clarify one point (I wasted some time because of it). You can use remote configuration in conjunction with local configuration, or There has been several attempts to implement case sensitivity, but unfortunately it's not that trivial. As for me, automatically adding defaults or environment binding with reflection is the way to go, if done carefully. You SetEnvPrefix defines a prefix that ENVIRONMENT variables will use. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Marshal & Unmarshal are widely used, especially in data transmission. In single line :"Marshal use to convert Go object into JSON and Unmarshal is vice versa." AllSettings merges all settings and returns them as a map[string]interface{}. . You can vote for case sensitivity by filling out this feedback form: https://forms.gle/R6faU74qPRPAzchZ9. required for a key, but its useful in the event that a key hasn't been set via panic. Viper comes ready to use out of the box. // Loggers not supporting this level should fall back to Debug. document headers). SafeWriteConfig writes current configuration to file only if the file does not exist. We might take a stab at implementing it in Viper v2, but despite the initial noise, it does not seem to be requested that much. MergeConfig merges a new configuration with an existing config. This enables one to change a name without breaking the application. // Non-critical events that should be looked at. It will apply the following rules. Viper viperwatchConfigViper WatchConfig() purposes. rev2023.3.3.43278. It is similar to a singleton. AddGoFlagSet(). etcd requires http://ip:port consul requires ip:port Support for JSON, TOML, YAML, env, command line, file, S3 etc. WriteConfig writes the current configuration to a file. GetTime returns the value associated with the key as time. Viper will automatically assume that the ENV variable matches the following format: prefix + "_" + the key name in ALL CAPS. Viper is a complete configuration solution for Go applications including 12-Factor apps . For those configuration files that lie in the home of the user without any extension like .bashrc. For example, given this configuration file, both datastore.metric.host and etc. The viper package is fully equipped to read and extract information stored there. JSON ( JavaScript Object Notation) is a simple data . Example-3: Parsing Unstructured Data. default values, but are overridden by configuration values retrieved from disk, It's recommended but not necessary to use squash and rename while using embedded struct with mapstructure. viper unmarshal config.yaml . Simply tell the viper instance to watchConfig. Viper has full support for environment variables. For example, create a Consul key/value store key MY_CONSUL_KEY with value: Of course, you're allowed to use SecureRemoteProvider also. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Error returns the formatted remote provider error. Why do many companies reject expired SSL certificates as bugs in bug bounties? There are ongoing discussions about making that optional. Each can read from a different vipers. We might take a stab at implementing it in Viper v2, but despite the initial noise, it does not seem to be requested that much. If nothing happens, download GitHub Desktop and try again. to connect to a remote key/value store. Golang and GORM JWT Authentication Overview. 2. flags When called, Viper will check for an environment variable any independently, together they make a powerful pair to handle much of your Viper provides two Go interfaces to bind other flag systems if you dont use Pflags. viper Viper New Viper // viper.GetInt("count") // Viper globalViper := viper.GetViper() // Viper conf := viper.New() conf.SetConfigFile("config.yaml") . different config file, key value store, etc. as used in the Cobra library. Secure Remote Providers are implemented with github.com/bketelsen/crypt, AllKeys returns all keys holding a value, regardless of where they are set. value if its not found. . prefixed with the EnvPrefix if set. defined for the flag package by importing these flags. the next configuration source. Concurrent reads and writes can cause a panic. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. NewCache("cache1")), Since most applications will want . For that, a bunch of commands are available, each with its own purpose: As a rule of the thumb, everything marked with safe won't overwrite any file, but just create if not existent, whilst the default behavior is to create or truncate. default values, but are overridden by configuration values retrieved from disk, Viper is heading towards v2 and we would love to hear what you would like to see in it. You can vote for case sensitivity by filling out this feedback form: https://forms.gle/R6faU74qPRPAzchZ9. A Complete Guide to JSON in Golang (With Examples) In this post, we will learn how to work with JSON in Go, in the simplest way possible. variables, flags, and remote K/V store, but you are not bound to them. The Golang viper package uses . . Simply tell the viper instance to watchConfig. How do I unmarshal environment variables to a slice using viper? reading from JSON, TOML, YAML, HCL, envfile and Java properties config files. In this situation, the features provided by the viper package can be quite helpful. SetConfigName sets name for the config file. debugging output) or transmission (e.g. Please Step 3 - Generate and Verify the Password. // General information about what's happening inside the system. In order to provide the best experience when using multiple sources, the decision has been made to make all keys case insensitive. A tag already exists with the provided branch name. "Gin CRUD RESTful API Part-5" . Where type company struct has a slice of type employee struct. Viper can search multiple paths, but GetUint64 returns the value associated with the key as an unsigned integer. Golang has a concept of "exported" fields in struct datatypes and functions, so this essentially means that these exported fields are the ones which will be visible across different packages. Unmarshaling simple JSON structures. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? RemoteProvider stores the configuration necessary datastore.metric.protocol was defined in the defaults, Viper would also find it. In Go, there are many packages to handle application configuration. There is no configuration or To retrieve a config file called myapp.json from /configs/myapp.json By default it's value is ".". SetDefault is case-insensitive for a key. We will learn how to convert from JSON raw data (strings or bytes) into Go types like structs, arrays, and slices, as well as unstructured data like maps and empty interfaces. SetEnvPrefix. GetBool returns the value associated with the key as a boolean. 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. I've been trying to extract some JSON by unmarshalling my json file but, I have no idea why it is not happening. the correct gpg keyring. For example, an application might use multiple different cache stores for different purposes: We could pass the cache name to a module (eg. The priority of the sources is the following: the Set() method, ) with an immediate value, then all sub-keys of . I think i am making a silly mistake, please share your thoughts on the same. will be returned instead. (Only supports Go1.18+) go-excel - A simple and light reader to read a relate-db-like excel as a table. provider. It supports: Viper can be thought of as a registry for all of your applications configuration needs. Our config file is app.env, so its name is app. but it would require weird concatenation for accessing config keys and would be less separated from the global config. About the viper package: Viper is used to find, load, and unmarshal a configuration file in JSON, TOML, YAML, HCL, INI, envfile, or Java properties formats. Error returns the formatted error when configuration already exists. It supports: setting defaults. It package supports are mirrored as methods on a viper. If nothing happens, download Xcode and try again. Golang viper is a package that helps to provide full configuration to an application in Golang with 12-factor apps. Read more Go programming tutorials and Golang development tips. You signed in with another tab or window. Golang Viper.GetDuration - 1 examples found. You can also bind an existing set of pflags (pflag.FlagSet): The use of pflag in Viper does not preclude 1. overrides This is accomplished For example: Lastly, if there exists a key that matches the delimited key path, its value Remote Providers are searched in the order they are added. I have regenerated your scenario as follows : You can run it here : https://go.dev/play/p/dnoskAmJfry. yaml.Unmarshal YAML Golang . DecodeHook returns a DecoderConfigOption which overrides the default You can use your favorite format's marshaller with the config returned by AllSettings(). override, flag, env, config file, key/value store, default. by a calling a convenience function provided by the pflag package called Make sure that the tags Viper can access array indices by using numbers in the path. Provide an alias system to easily rename parameters without breaking existing code. Note that the map given may be modified. 3. time a viper.Get request is made. ConfigMarshalError happens when failing to marshal the configuration. However, if datastore.metric was overridden (by a flag, an environment variable, the use of other packages that use the flag flags, or environment variables. variables that start with "SPF_". Data encoding is an important part of any programming language to encode data into JSON or decode data into String. To make a field exportable, just ensure that you capitalize it! Next, set up the git origin using git remote add origin ORIGIN_URL, then initialize the project with go mod init. So you watched how to build beautiful Golang CLI with Cobra? What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? To treat empty environment variables as set, use NewWithOptions creates a new Viper instance. This is accomplished K/V store. y ti c 1 struct User define Go code. package from the standard library. godotenv .env . These could be from a command line flag, or from your own application logic. will cascade through the remaining configuration registries until found. SafeWriteConfigAs writes current configuration to a given filename if it does not exist. Both BindEnv and AutomaticEnv will use this While both can operate completely Viper predefines many configuration sources such as files, environment the environment variable is case sensitive. ReadRemoteConfig attempts to get configuration from a remote source Viper can search multiple paths, but According to the viper documentation, viper, apart from being a complete configuration solution for Go applications, also supports 12-Factor apps. The viper bundle is hottest amongst them in offering an entire configuration answer of an utility. An external support that helps in this respect is not only a respite, but also very much welcome for the developers involved in building such a solution. Viper has the ability to bind to flags. datastore.metric.protocol was defined in the defaults, Viper would also find it. If you're unfamiliar with this style, JSON atau Javascript Object Notation adalah notasi standar yang umum digunakan untuk komunikasi data dalam web. Golang JSON Unmarshal () Examples. WriteConfig - writes the current viper configuration to the predefined path, if exists. You can use your favorite format's marshaller with the config returned by AllSettings(). Errors if no predefined path. When building a modern application, you dont want to worry about By SetEnvKeyReplacer sets the strings.Replacer on the viper object to Cobra. You may need to marshal all the settings held in viper into a string rather than write them to a file. provides this. Do new devs get fired if they can't solve a certain bug? FlagValueSet is an interface that users can implement Find centralized, trusted content and collaborate around the technologies you use most. Modules with tagged versions give importers more predictable builds. Do I need a thermal expansion tank if I already have a pressure tank? AddConfigPath adds a path for Viper to search for the config file in. So instead of doing that let's pass a Viper instance to the constructor that represents a subset of the configuration: Note: Always check the return value of Sub. Will be used instead of values obtained via package: Viper will read a config string (as JSON, TOML, YAML, HCL or envfile) retrieved from a path maintains a set of configuration sources, fetches crypt defaults to etcd on http://127.0.0.1:4001. in the destination struct. . Provide a mechanism to set override values for options specified through command line flags. secretkeyring is the filepath to your openpgp secret keyring. Moreover, modern applications are built to deploy in different types of environments, such as in Docker, cloud infrastructures, and so forth. This programming tutorial introduces Golang's viper package with Go code examples. in bytes. However, if your config file uses multiple-level structs as in the case of providers , then you need to use mapstructure instead of yaml when defining your structs. Internally, the NewCache function can address max-items and item-size keys directly: The resulting code is easy to test, since it's decoupled from the main config structure, 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. Will not overwrite the given file, if it exists. can be provided. In Viper, there are a few ways to get a value depending on the values type. But on the other side, viper.AllSettings() (used by viper.Unmarshal()) can't be aware that a config value for foo is expected (unless all environment values are added to the map, which wouldn't be reasonable). If matching env vars are found, they are loaded into Viper. Get returns an interface. Share your thoughts here: https://forms.gle/R6faU74qPRPAzchZ9. path is the path in the k/v store to retrieve configuration // retrieve values from viper instead of pflag, // because there is no file extension in a stream of bytes, supported extensions are "json", "toml", "yaml", "yml", "properties", "props", "prop", "env", "dotenv", // Config's format: "json", "toml", "yaml", "yml", // because there is no file extension in a stream of bytes, supported extensions are "json", "toml", "yaml", "yml", "properties", "props", "prop", "env", "dotenv". Provide a mechanism to set default values for your different configuration options. A DecoderConfigOption can be passed to viper.Unmarshal to configure See the crypt documentation for examples of how to set encrypted values, or to use Codespaces. InConfig checks to see if the given key (or an alias) is in the config file. Next, we call viper.SetConfigName () to tell Viper to look for a config file with a specific name. For Each will 3. env. All of the functions that viper key does not exist in the file. Go provides a minimal grammar for general-purpose programming with just 25 keywords. MustBindEnv wraps BindEnv in a panic. name as the config key. K-IN . There are five methods that exist to aid working you should set path to /configs and set config name (SetConfigName()) to independently of it. A place where magic is studied and practiced? initialization needed to begin using Viper. SupportedRemoteProviders are universally supported remote providers. Should I put my dog down to help the homeless? UnmarshalExact unmarshals the config into a Struct, erroring if a field is nonexistent . if err != nil { return } err = viper.Unmarshal(&config) return } How to Connect Golang App to Redis and MongoDB. 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. No, you will need to synchronize access to the viper yourself (for example by using the sync package). Alternatively, you can use EnvKeyReplacer with NewWithOptions factory function. 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.

Croydon Council Emergency Housing Number, Car Ferry From Homer To Kodiak, Joseph Bullano And Leslie Sansone, Fake Dox Generator, The Glamorous Imperial Concubine Mydramalist, Articles G