profcollectd: Rust bindings for libflags

To be used by complete Rust rewrite of profcollect.

Test: rustc
Bug: 163175424
Change-Id: I14f82030bfc5dc9c7790cbe5f1d5d65130a05a19

1 files changed, 43 insertions, 0 deletions

diff --git a/profcollectd/libprofcollectd/bindings/libflags/lib.rs b/profcollectd/libprofcollectd/bindings/libflags/lib.rs
new file mode 100644
index 00000000..c8875cb1
--- /dev/null
+++ b/profcollectd/libprofcollectd/bindings/libflags/lib.rs
@@ -0,0 +1,43 @@
+//
+// Copyright (C) 2021 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 implements safe wrappers for GetServerConfigurableFlag method
+//! from libflags.
+
+use std::ffi::{CStr, CString};
+
+/// Use the category name and flag name registered in SettingsToPropertiesMapper.java
+/// to query the experiment flag value. This method will return default_value if
+/// querying fails.
+/// Note that for flags from Settings.Global, experiment_category_name should
+/// always be global_settings.
+pub fn get_server_configurable_flag<'a>(
+    experiment_category_name: &str,
+    experiment_flag_name: &str,
+    default_value: &'a str,
+) -> &'a str {
+    let experiment_category_name = CString::new(experiment_category_name).unwrap();
+    let experiment_flag_name = CString::new(experiment_flag_name).unwrap();
+    let default_value = CString::new(default_value).unwrap();
+    unsafe {
+        let cstr = profcollect_libflags_bindgen::GetServerConfigurableFlag(
+            experiment_category_name.as_ptr(),
+            experiment_flag_name.as_ptr(),
+            default_value.as_ptr(),
+        );
+        CStr::from_ptr(cstr).to_str().unwrap()
+    }
+}