in preparation for socket file length limitation

go/base/context.go

@@ -48,8 +48,9 @@ const (
 )
 
 const (
-	HTTPStatusOK       = 200
-	MaxEventsBatchSize = 1000
+	HTTPStatusOK            = 200
+	MaxEventsBatchSize      = 1000
+	MaxSocketFileNameLength = 104
 )
 
 var (
@@ -242,6 +243,10 @@ func NewMigrationContext() *MigrationContext {
 	}
 }
 
+func (this *MigrationContext) GetServeSocketFile() string {
+	return this.ServeSocketFile
+}
+
 func getSafeTableName(baseName string, suffix string) string {
 	name := fmt.Sprintf("_%s_%s", baseName, suffix)
 	if len(name) <= mysql.MaxTableNameLength {

go/base/context_test.go

@@ -56,3 +56,12 @@ func TestGetTableNames(t *testing.T) {
 		test.S(t).ExpectEquals(context.GetChangelogTableName(), "_tmp_ghc")
 	}
 }
+
+func TestGetServeSocketFile(t *testing.T) {
+	{
+		context := NewMigrationContext()
+		socketFile := "/tmp/gh-ost.sock"
+		context.ServeSocketFile = socketFile
+		test.S(t).ExpectEquals(context.GetServeSocketFile(), "/tmp/gh-ost.sock")
+	}
+}