fieldalignment of all structs to save memory

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

metadata/context.go

@@ -5,9 +5,11 @@ import (
 	"context"
 )
 
-type mdIncomingKey struct{}
-type mdOutgoingKey struct{}
-type mdKey struct{}
+type (
+	mdIncomingKey struct{}
+	mdOutgoingKey struct{}
+	mdKey         struct{}
+)
 
 // FromIncomingContext returns metadata from incoming ctx
 // returned metadata shoud not be modified or race condition happens

metadata/metadata.go

@@ -6,10 +6,8 @@ import (
 	"sort"
 )
 
-var (
-	// HeaderPrefix for all headers passed
-	HeaderPrefix = "Micro-"
-)
+// HeaderPrefix for all headers passed
+var HeaderPrefix = "Micro-"
 
 // Metadata is our way of representing request headers internally.
 // They're used at the RPC level and translate back and forth
@@ -20,10 +18,8 @@ type rawMetadata struct {
 	md Metadata
 }
 
-var (
-	// defaultMetadataSize used when need to init new Metadata
-	defaultMetadataSize = 2
-)
+// defaultMetadataSize used when need to init new Metadata
+var defaultMetadataSize = 2
 
 // Iterator used to iterate over metadata with order
 type Iterator struct {

metadata/metadata_test.go

@@ -76,7 +76,7 @@ func TestIterator(t *testing.T) {
 	var k, v string
 
 	for iter.Next(&k, &v) {
-		//fmt.Printf("k: %s, v: %s\n", k, v)
+		// fmt.Printf("k: %s, v: %s\n", k, v)
 	}
 }
 
@@ -102,7 +102,6 @@ func TestMedataCanonicalKey(t *testing.T) {
 	} else if v != "12345" {
 		t.Fatalf("invalid metadata value: %s != %s", "12345", v)
 	}
-
 }
 
 func TestMetadataSet(t *testing.T) {
@@ -130,7 +129,6 @@ func TestMetadataDelete(t *testing.T) {
 	if ok {
 		t.Fatal("key Baz not deleted")
 	}
-
 }
 
 func TestNilContext(t *testing.T) {