Update Staert.

Gopkg.lock

@@ -243,8 +243,8 @@
 [[projects]]
   name = "github.com/containous/staert"
   packages = ["."]
-  revision = "dbb7c840f31daec0d863ada6829d075a8dbb7469"
-  version = "v3.0.0"
+  revision = "cc00c303ccbd2491ddc1dccc9eb7ccadd807557e"
+  version = "v3.1.0"
 
 [[projects]]
   name = "github.com/containous/traefik-extra-service-fabric"
@@ -1496,6 +1496,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "865659187f3824cb57b8ff8805e3114b806c67ee0ffe9cbc6db237e4038edee6"
+  inputs-digest = "17cefac15e170ca9d73093cad7a8f1fb6874cd03eeb67ccc3f8fe4d239f6e9aa"
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -62,7 +62,7 @@
 
 [[constraint]]
   name = "github.com/containous/staert"
-  version = "3.0.0"
+  version = "3.1.0"
 
 [[constraint]]
   name = "github.com/containous/traefik-extra-service-fabric"

vendor/github.com/containous/staert/kv.go

@@ -1,10 +1,14 @@
 package staert
 
 import (
+	"bytes"
+	"compress/gzip"
 	"encoding"
 	"encoding/base64"
 	"errors"
 	"fmt"
+	"io"
+	"io/ioutil"
 	"reflect"
 	"sort"
 	"strconv"
@@ -155,16 +159,32 @@ func decodeHook(fromType reflect.Type, toType reflect.Type, data interface{}) (i
 
 			return dataOutput, nil
 		} else if fromType.Kind() == reflect.String {
-			b, err := base64.StdEncoding.DecodeString(data.(string))
-			if err != nil {
-				return nil, err
-			}
-			return b, nil
+			return readCompressedData(data.(string), gzipReader, base64Reader)
 		}
 	}
 	return data, nil
 }
 
+func readCompressedData(data string, fs ...func(io.Reader) (io.Reader, error)) ([]byte, error) {
+	var err error
+	for _, f := range fs {
+		var reader io.Reader
+		reader, err = f(bytes.NewBufferString(data))
+		if err == nil {
+			return ioutil.ReadAll(reader)
+		}
+	}
+	return nil, err
+}
+
+func base64Reader(r io.Reader) (io.Reader, error) {
+	return base64.NewDecoder(base64.StdEncoding, r), nil
+}
+
+func gzipReader(r io.Reader) (io.Reader, error) {
+	return gzip.NewReader(r)
+}
+
 // StoreConfig stores the config into the KV Store
 func (kv *KvSource) StoreConfig(config interface{}) error {
 	kvMap := map[string]string{}
@@ -263,7 +283,11 @@ func collateKvRecursive(objValue reflect.Value, kv map[string]string, key string
 	case reflect.Array, reflect.Slice:
 		// Byte slices get special treatment
 		if objValue.Type().Elem().Kind() == reflect.Uint8 {
-			kv[name] = base64.StdEncoding.EncodeToString(objValue.Bytes())
+			compressedData, err := writeCompressedData(objValue.Bytes())
+			if err != nil {
+				return err
+			}
+			kv[name] = compressedData
 		} else {
 			for i := 0; i < objValue.Len(); i++ {
 				name = key + "/" + strconv.Itoa(i)
@@ -286,6 +310,17 @@ func collateKvRecursive(objValue reflect.Value, kv map[string]string, key string
 	return nil
 }
 
+func writeCompressedData(data []byte) (string, error) {
+	var buffer bytes.Buffer
+	gzipWriter := gzip.NewWriter(&buffer)
+	_, err := gzipWriter.Write(data)
+	if err != nil {
+		return "", err
+	}
+	gzipWriter.Close()
+	return buffer.String(), nil
+}
+
 // ListRecursive lists all key value children under key
 func (kv *KvSource) ListRecursive(key string, pairs map[string][]byte) error {
 	pairsN1, err := kv.List(key, nil)