V(ersion) Resolver

Simple and flexible way to fetch your app version.

Wether your app is a CLI or runs in background and generate logs, it's never been as easy to fetch your app version with this lib.

Supported resolvers:

• Environment variable
• AWS ECS Metadata File
• Fallback
• Composite

Example

import "github.com/eexit/vresolver"

// Tries to fetch the version from the runtime ECS container
// and fallbacks to "bulk-version" otherwise
version := vresolver.Compose(
	vresolver.Env,
	vresolver.ECS,
	vresolver.Fallback("bulk-version"),
)(vresolver.ECSMetadataFileEnvVar)

Installation

$ go get -u github.com/eexit/vresolver

Test

$ go test -v -race ./...

Custom resolver

You can build a custom resolver as long as it matches the following type:

type Resolver func(input string) string

For instance, let's create a Panic resolver, that panics if no version is resolved:

// Panic panics when app has no version
func Panic(input string) string {
	if input == "" {
		panic("no app version was resolved")
	}
	return input
}

version := vresolver.Compose(vresolver.Env, Panic)("MY_APP_VERSION")