add config

config/source/options.go

@@ -0,0 +1,38 @@
+package source
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/config/encoder"
+	"github.com/micro/go-micro/config/encoder/json"
+)
+
+type Options struct {
+	// Encoder
+	Encoder encoder.Encoder
+
+	// for alternative data
+	Context context.Context
+}
+
+type Option func(o *Options)
+
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Encoder: json.NewEncoder(),
+		Context: context.Background(),
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
+// WithEncoder sets the source encoder
+func WithEncoder(e encoder.Encoder) Option {
+	return func(o *Options) {
+		o.Encoder = e
+	}
+}