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loader_env.go
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loader_env.go
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package gonfig
import (
"os"
"github.com/crazy-max/gonfig/env"
"github.com/pkg/errors"
)
// EnvLoader is the structure representring an environment variable loader.
type EnvLoader struct {
vars []string
cfg EnvLoaderConfig
}
// EnvLoaderConfig loads a configuration from environment variables.
type EnvLoaderConfig struct {
// Prefix to use. Default to "GONFIG_"
Prefix string
}
// New creates a new Loader from the EnvLoaderConfig cfg.
func NewEnvLoader(cfg EnvLoaderConfig) *EnvLoader {
return &EnvLoader{
cfg: cfg,
}
}
// GetVars returns the environment variables found.
func (l *EnvLoader) GetVars() []string {
return l.vars
}
// Load loads the configuration from the environment variables.
func (l *EnvLoader) Load(cfg interface{}) (bool, error) {
prefix := l.cfg.Prefix
if prefix == "" {
prefix = env.DefaultNamePrefix
}
l.vars = env.FindPrefixedEnvVars(os.Environ(), prefix, cfg)
if len(l.vars) == 0 {
return false, nil
}
if err := env.Decode(l.vars, prefix, cfg); err != nil {
return false, errors.Wrap(err, "Failed to decode configuration from environment variables")
}
return true, nil
}