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Mark Sagi-Kazar 2019-12-06 13:58:19 +01:00 committed by Márk Sági-Kazár
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@ -20,10 +20,12 @@ Many Go projects are built using Viper including:
## Install ## Install
```console ```console
go get -u github.com/spf13/viper go get github.com/spf13/viper
``` ```
## What is Viper? ## What is Viper?
Viper is a complete configuration solution for Go applications including 12-Factor apps. It is designed Viper is a complete configuration solution for Go applications including 12-Factor apps. It is designed
@ -39,8 +41,8 @@ and formats. It supports:
* reading from buffer * reading from buffer
* setting explicit values * setting explicit values
Viper can be thought of as a registry for all of your applications Viper can be thought of as a registry for all of your applications configuration needs.
configuration needs.
## Why Viper? ## Why Viper?
@ -50,34 +52,31 @@ Viper is here to help with that.
Viper does the following for you: Viper does the following for you:
1. Find, load, and unmarshal a configuration file in JSON, TOML, YAML, HCL, envfile or Java properties formats. 1. Find, load, and unmarshal a configuration file in JSON, TOML, YAML, HCL, INI, envfile or Java properties formats.
2. Provide a mechanism to set default values for your different 2. Provide a mechanism to set default values for your different configuration options.
configuration options. 3. Provide a mechanism to set override values for options specified through command line flags.
3. Provide a mechanism to set override values for options specified through 4. Provide an alias system to easily rename parameters without breaking existing code.
command line flags. 5. 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.
4. Provide an alias system to easily rename parameters without breaking existing
code.
5. 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 uses the following precedence order. Each item takes precedence over the Viper uses the following precedence order. Each item takes precedence over the item below it:
item below it:
* explicit call to Set * explicit call to `Set`
* flag * flag
* env * env
* config * config
* key/value store * key/value store
* default * default
Viper configuration keys are case insensitive. **Important:** Viper configuration keys are case insensitive.
There are ongoing discussions about making that optional.
## Putting Values into Viper ## Putting Values into Viper
### Establishing Defaults ### Establishing Defaults
A good configuration system will support default values. A default value is not A good configuration system will support default values. A default value is not
required for a key, but it’s useful in the event that a key hasn’t been set via required for a key, but it’s useful in the event that a key hasn't been set via
config file, environment variable, remote configuration or flag. config file, environment variable, remote configuration or flag.
Examples: Examples:
@ -91,7 +90,7 @@ viper.SetDefault("Taxonomies", map[string]string{"tag": "tags", "category": "cat
### Reading Config Files ### Reading Config Files
Viper requires minimal configuration so it knows where to look for config files. Viper requires minimal configuration so it knows where to look for config files.
Viper supports JSON, TOML, YAML, HCL, envfile and Java Properties files. Viper can search multiple paths, but Viper supports JSON, TOML, YAML, HCL, INI, envfile and Java Properties files. Viper can search multiple paths, but
currently a single Viper instance only supports a single configuration file. currently a single Viper instance only supports a single configuration file.
Viper does not default to any configuration search paths leaving defaults decision Viper does not default to any configuration search paths leaving defaults decision
to an application. to an application.