Made storepb.RuleGroups a source of truth for rules API (Go, JSON, pr…

…oto). Added tests.

Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>

go.mod

@@ -18,6 +18,7 @@ require (
 	github.com/go-kit/kit v0.9.0
 	github.com/go-openapi/strfmt v0.19.2
 	github.com/gogo/protobuf v1.3.1
+	github.com/gogo/status v1.0.3
 	github.com/golang/snappy v0.0.1
 	github.com/googleapis/gax-go v2.0.2+incompatible
 	github.com/gophercloud/gophercloud v0.6.0

go.sum

@@ -681,6 +681,7 @@ github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4k
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spaolacci/murmur3 v1.1.0 h1:7c1g84S4BPRrfL5Xrdp6fOJ206sU9y293DDHaoy0bLI=
 github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
+github.com/spf13/afero v1.2.2 h1:5jhuqJyZCZf2JRofRvN/nIFgIWNzPa3/Vz8mYylgbWc=
 github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=

pkg/store/storepb/custom.go

@@ -171,7 +171,14 @@ func LabelsToPromLabels(lset []Label) labels.Labels {
 	for i, l := range lset {
 		ret[i] = labels.Label{Name: l.Name, Value: l.Value}
 	}
+	return ret
+}
 
+func PromLabelsToLabels(lset labels.Labels) []Label {
+	ret := make([]Label, len(lset))
+	for i, l := range lset {
+		ret[i] = Label{Name: l.Name, Value: l.Value}
+	}
 	return ret
 }