resources: Split util functions into separate file

This also adds errwrap to their implementation.

resources/resources.go

@@ -19,9 +19,6 @@
 package resources
 
 import (
-	"bytes"
-	"encoding/base64"
-	"encoding/gob"
 	"fmt"
 	"log"
 	"math"
@@ -674,35 +671,3 @@ func (obj *BaseRes) Poll() error {
 func (obj *BaseRes) Prometheus() *prometheus.Prometheus {
 	return obj.prometheus
 }
-
-// ResToB64 encodes a resource to a base64 encoded string (after serialization)
-func ResToB64(res Res) (string, error) {
-	b := bytes.Buffer{}
-	e := gob.NewEncoder(&b)
-	err := e.Encode(&res) // pass with &
-	if err != nil {
-		return "", fmt.Errorf("Gob failed to encode: %v", err)
-	}
-	return base64.StdEncoding.EncodeToString(b.Bytes()), nil
-}
-
-// B64ToRes decodes a resource from a base64 encoded string (after deserialization)
-func B64ToRes(str string) (Res, error) {
-	var output interface{}
-	bb, err := base64.StdEncoding.DecodeString(str)
-	if err != nil {
-		return nil, fmt.Errorf("Base64 failed to decode: %v", err)
-	}
-	b := bytes.NewBuffer(bb)
-	d := gob.NewDecoder(b)
-	err = d.Decode(&output) // pass with &
-	if err != nil {
-		return nil, fmt.Errorf("Gob failed to decode: %v", err)
-	}
-	res, ok := output.(Res)
-	if !ok {
-		return nil, fmt.Errorf("Output %v is not a Res", res)
-
-	}
-	return res, nil
-}

resources/util.go

@@ -0,0 +1,59 @@
+// Mgmt
+// Copyright (C) 2013-2017+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package resources
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/gob"
+	"fmt"
+
+	errwrap "github.com/pkg/errors"
+)
+
+// ResToB64 encodes a resource to a base64 encoded string (after serialization).
+func ResToB64(res Res) (string, error) {
+	b := bytes.Buffer{}
+	e := gob.NewEncoder(&b)
+	err := e.Encode(&res) // pass with &
+	if err != nil {
+		return "", errwrap.Wrapf(err, "gob failed to encode")
+	}
+	return base64.StdEncoding.EncodeToString(b.Bytes()), nil
+}
+
+// B64ToRes decodes a resource from a base64 encoded string (after deserialization).
+func B64ToRes(str string) (Res, error) {
+	var output interface{}
+	bb, err := base64.StdEncoding.DecodeString(str)
+	if err != nil {
+		return nil, errwrap.Wrapf(err, "base64 failed to decode")
+	}
+	b := bytes.NewBuffer(bb)
+	d := gob.NewDecoder(b)
+	err = d.Decode(&output) // pass with &
+	if err != nil {
+		return nil, errwrap.Wrapf(err, "gob failed to decode")
+	}
+	res, ok := output.(Res)
+	if !ok {
+		return nil, fmt.Errorf("Output %v is not a Res", res)
+
+	}
+	return res, nil
+}