micro/config/source/env/options.go

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2019-05-31 01:11:13 +03:00
package env
import (
"context"
"strings"
"github.com/micro/go-micro/config/source"
)
type strippedPrefixKey struct{}
type prefixKey struct{}
// WithStrippedPrefix sets the environment variable prefixes to scope to.
// These prefixes will be removed from the actual config entries.
func WithStrippedPrefix(p ...string) source.Option {
return func(o *source.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, strippedPrefixKey{}, appendUnderscore(p))
}
}
// WithPrefix sets the environment variable prefixes to scope to.
// These prefixes will not be removed. Each prefix will be considered a top level config entry.
func WithPrefix(p ...string) source.Option {
return func(o *source.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, prefixKey{}, appendUnderscore(p))
}
}
func appendUnderscore(prefixes []string) []string {
//nolint:prealloc
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var result []string
for _, p := range prefixes {
if !strings.HasSuffix(p, "_") {
result = append(result, p+"_")
continue
}
result = append(result, p)
}
return result
}