service: implement Raw field setter on RequestMetaHeader struct

After recent changes Raw field is presented in RequestMetaHeader.
There is a need to provide an interface of field getter/setter.

This commit:

  * defines RawHeader interface of raw value container;

  * embeds RawHeader into MetaHeader interface;

  * implements Raw field setter on RequestMetaHeader.

service/meta.go

@@ -25,6 +25,9 @@ type (
 
 		// VersionHeader allows get or set version of protocol request
 		VersionHeader
+
+		// RawHeader allows to get and set raw option of request
+		RawHeader
 	}
 
 	// EpochHeader interface gives possibility to get or set epoch in RPC Requests.
@@ -39,6 +42,12 @@ type (
 		SetVersion(uint32)
 	}
 
+	// RawHeader is an interface of the container of a boolean Raw value
+	RawHeader interface {
+		GetRaw() bool
+		SetRaw(bool)
+	}
+
 	// TTLCondition is closure, that allows to validate request with ttl.
 	TTLCondition func(ttl uint32) error
 )
@@ -77,6 +86,11 @@ func (m *RequestMetaHeader) SetTTL(v uint32) { m.TTL = v }
 // SetEpoch sets Epoch to RequestMetaHeader.
 func (m *RequestMetaHeader) SetEpoch(v uint64) { m.Epoch = v }
 
+// SetRaw is a Raw field setter.
+func (m *RequestMetaHeader) SetRaw(raw bool) {
+	m.Raw = raw
+}
+
 // ResetMeta returns current value and sets RequestMetaHeader to empty value.
 func (m *RequestMetaHeader) ResetMeta() RequestMetaHeader {
 	cp := *m

service/meta_test.go

@@ -102,3 +102,13 @@ func TestRequestMetaHeader_SetVersion(t *testing.T) {
 	m.SetVersion(version)
 	require.Equal(t, version, m.GetVersion())
 }
+
+func TestRequestMetaHeader_SetRaw(t *testing.T) {
+	m := new(RequestMetaHeader)
+
+	m.SetRaw(true)
+	require.True(t, m.GetRaw())
+
+	m.SetRaw(false)
+	require.False(t, m.GetRaw())
+}