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https://github.com/kkyr/fig
A minimalist Go configuration library
https://github.com/kkyr/fig
config-file configuration configuration-management environment environment-variables go golang json toml yaml
Last synced: 3 months ago
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A minimalist Go configuration library
- Host: GitHub
- URL: https://github.com/kkyr/fig
- Owner: kkyr
- License: apache-2.0
- Created: 2020-01-16T18:43:19.000Z (about 5 years ago)
- Default Branch: master
- Last Pushed: 2024-03-04T23:00:30.000Z (11 months ago)
- Last Synced: 2024-07-31T20:44:17.065Z (6 months ago)
- Topics: config-file, configuration, configuration-management, environment, environment-variables, go, golang, json, toml, yaml
- Language: Go
- Homepage:
- Size: 246 KB
- Stars: 367
- Watchers: 4
- Forks: 31
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# fig
fig is a tiny library for loading an application's configuration into a Go struct.
## Why fig?
- 🛠️ Define your **configuration**, **validations** and **defaults** all within a single struct.
- 🌍 Easily load your configuration from a **file**, the **environment**, or both.
- ⏰ Decode strings into `Time`, `Duration`, `Regexp`, or any custom type that satisfies the `StringUnmarshaler` interface.
- 🗂️ Compatible with `yaml`, `json`, and `toml` file formats.
- 🧩 Only three external dependencies.
## Getting Started
`$ go get -d github.com/kkyr/fig`
Define your config file:
```yaml
# config.yaml
build: "2020-01-09T12:30:00Z"
server:
ports:
- 8080
cleanup: 1h
logger:
level: "warn"
trace: true
```
Define your struct along with _validations_ or _defaults_:
```go
package main
import (
"fmt"
"github.com/kkyr/fig"
)
type Config struct {
Build time.Time `fig:"build" validate:"required"`
Server struct {
Host string `fig:"host" default:"127.0.0.1"`
Ports []int `fig:"ports" default:"[80,443]"`
Cleanup time.Duration `fig:"cleanup" default:"30m"`
}
Logger struct {
Level string `fig:"level" default:"info"`
Pattern *regexp.Regexp `fig:"pattern" default:".*"`
Trace bool `fig:"trace"`
}
}
func main() {
var cfg Config
err := fig.Load(&cfg)
// error handling omitted
fmt.Printf("%+v\n", cfg)
// {Build:2019-12-25T00:00:00Z Server:{Host:127.0.0.1 Ports:[8080] Cleanup:1h0m0s} Logger:{Level:warn Pattern:.* Trace:true}}
}
```
Fields marked as _required_ are checked to ensure they're not empty, and _default_ values are applied to fill in those that are empty.
## Environment
By default, fig will only look for values in a config file. To also include values from the environment, use the `UseEnv` option:
```go
fig.Load(&cfg, fig.UseEnv("APP_PREFIX"))
```
In case of conflicts, values from the environment take precedence.
## Usage
See usage [examples](/examples).
## Documentation
For detailed documentation, visit [go.dev](https://pkg.go.dev/github.com/kkyr/fig?tab=doc).
## Contributing
PRs are welcome! Please explain your motivation for the change in your PR and ensure your change is properly tested and documented.