✨ Add read only database to namespace

Author: julien040

namespace/namespace.go

@@ -55,6 +55,9 @@ type NamespaceConfig struct {
 
 	// The hclog logger to use from hashicorp/go-hclog
 	Logger hclog.Logger
+
+	// If ReadOnly is set to true, the database will be opened in read-only mode
+	ReadOnly bool
 }
 
 type Namespace struct {
@@ -112,6 +115,8 @@ func (n *Namespace) Init(config NamespaceConfig) error {
 		// Open the database in memory if needed
 		if config.InMemory {
 			connectionStringBuilder.WriteString("&mode=memory")
+		} else if config.ReadOnly {
+			connectionStringBuilder.WriteString("&mode=ro")
 		}
 
 		// Set the page cache size

namespace/namespace_test.go

@@ -70,8 +70,29 @@ func TestNamespace(t *testing.T) {
 			namespace.connectionString, "The connection string should be correct")
 	})
 
+	t.Run("The connection string is set correctly for a read-only file DB", func(t *testing.T) {
+		var err error
+		namespace, err = NewNamespace(NamespaceConfig{
+			ReadOnly: true,
+		})
+		require.NoError(t, err, "The namespace should be initialized")
+		require.Equal(t, "file:anyquery.db?cache=shared&mode=ro&_cache_size=-50000&_journal_mode=WAL&_synchronous=NORMAL&_foreign_keys=OFF",
+			namespace.connectionString, "The connection string should be correct")
+	})
+
+	t.Run("The read only flag is ignored for in-memory DB", func(t *testing.T) {
+		var err error
+		namespace, err = NewNamespace(NamespaceConfig{
+			ReadOnly: true,
+			InMemory: true,
+		})
+		require.NoError(t, err, "The namespace should be initialized")
+		require.Equal(t, "file:anyquery.db?cache=shared&mode=memory&_cache_size=-50000&_journal_mode=WAL&_synchronous=NORMAL&_foreign_keys=OFF",
+			namespace.connectionString, "The connection string should be correct")
+	})
+
 	t.Run("The GetConnectionString method works", func(t *testing.T) {
-		require.Equal(t, "file:mytest.db?cache=shared&_foreign_keys=OFF",
+		require.Equal(t, "file:anyquery.db?cache=shared&mode=memory&_cache_size=-50000&_journal_mode=WAL&_synchronous=NORMAL&_foreign_keys=OFF",
 			namespace.GetConnectionString(), "The connection string should be correct")
 		require.Equal(t, namespace.connectionString, namespace.GetConnectionString(), "The connection string should be correct")
 	})