mirror of
https://github.com/Luzifer/culmqtt.git
synced 2024-09-19 23:32:58 +00:00
88 lines
2.7 KiB
Markdown
88 lines
2.7 KiB
Markdown
[](https://travis-ci.org/Luzifer/rconfig)
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[](http://www.apache.org/licenses/LICENSE-2.0)
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[](https://godoc.org/github.com/Luzifer/rconfig)
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[](http://goreportcard.com/report/Luzifer/rconfig)
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## Description
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> Package rconfig implements a CLI configuration reader with struct-embedded defaults, environment variables and posix compatible flag parsing using the [pflag](https://github.com/spf13/pflag) library.
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## Installation
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Install by running:
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```
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go get -u github.com/Luzifer/rconfig
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```
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OR fetch a specific version:
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```
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go get -u gopkg.in/luzifer/rconfig.v1
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```
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Run tests by running:
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```
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go test -v -race -cover github.com/Luzifer/rconfig
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```
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## Usage
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A very simple usecase is to just configure a struct inside the vars section of your `main.go` and to parse the commandline flags from the `main()` function:
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```go
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package main
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import (
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"fmt"
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"github.com/Luzifer/rconfig"
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)
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var (
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cfg = struct {
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Username string `default:"unknown" flag:"user" description:"Your name"`
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Details struct {
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Age int `default:"25" flag:"age" env:"age" description:"Your age"`
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}
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}{}
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)
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func main() {
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rconfig.Parse(&cfg)
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fmt.Printf("Hello %s, happy birthday for your %dth birthday.",
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cfg.Username,
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cfg.Details.Age)
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}
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```
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### Provide variable defaults by using a file
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Given you have a file `~/.myapp.yml` containing some secrets or usernames (for the example below username is assumed to be "luzifer") as a default configuration for your application you can use this source code to load the defaults from that file using the `vardefault` tag in your configuration struct.
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The order of the directives (lower number = higher precedence):
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1. Flags provided in command line
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1. Environment variables
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1. Variable defaults (`vardefault` tag in the struct)
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1. `default` tag in the struct
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```go
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var cfg = struct {
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Username string `vardefault:"username" flag:"username" description:"Your username"`
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}
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func main() {
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rconfig.SetVariableDefaults(rconfig.VarDefaultsFromYAMLFile("~/.myapp.yml"))
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rconfig.Parse(&cfg)
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fmt.Printf("Username = %s", cfg.Username)
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// Output: Username = luzifer
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}
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```
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## More info
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You can see the full reference documentation of the rconfig package [at godoc.org](https://godoc.org/github.com/Luzifer/rconfig), or through go's standard documentation system by running `godoc -http=:6060` and browsing to [http://localhost:6060/pkg/github.com/Luzifer/rconfig](http://localhost:6060/pkg/github.com/Luzifer/rconfig) after installation.
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