Keystore 2.0: Add globals.rs and utils.rs
These two files add some utility functions and a thread local reference
to a database connection.
Test: None
Change-Id: I34fdf977deb233571b9a0c6d50da20e47593d6a5
diff --git a/keystore2/src/globals.rs b/keystore2/src/globals.rs
new file mode 100644
index 0000000..0654b29
--- /dev/null
+++ b/keystore2/src/globals.rs
@@ -0,0 +1,29 @@
+// Copyright 2020, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! This module holds global state of Keystore such as the thread local
+//! database connections and connections to services that Keystore needs
+//! to talk to.
+
+use crate::database::KeystoreDB;
+use std::cell::RefCell;
+
+thread_local! {
+ /// Database connections are not thread safe, but connecting to the
+ /// same database multiple times is safe as long as each connection is
+ /// used by only one thread. So we store one database connection per
+ /// thread in this thread local key.
+ pub static DB: RefCell<KeystoreDB> =
+ RefCell::new(KeystoreDB::new().expect("Failed to open database."));
+}