Add updatable DeviceConfig Service

This adds a new service that will power the updatable DeviceConfig logic. The current design will take over from the "device_config" service that currently exists in the platform when UpdatableDeviceConfigServiceReadiness.shouldStartUpdatableService returns true. Otherwise the behaviour changes shouldn't be noticeable.

Bug: 261723346

Test: manual
Test: atest CtsDeviceConfigTestCases

Change-Id: I761e62aaf9503964ed848953575788b59c14a304

2 files changed, 85 insertions, 0 deletions

diff --git a/service/java/com/android/server/deviceconfig/DeviceConfigInit.java b/service/java/com/android/server/deviceconfig/DeviceConfigInit.java
new file mode 100644
index 0000000..dba14ba
--- /dev/null
+++ b/service/java/com/android/server/deviceconfig/DeviceConfigInit.java
@@ -0,0 +1,45 @@
+package com.android.server.deviceconfig;
+
+import java.io.FileDescriptor;
+
+import android.annotation.NonNull;
+import android.annotation.SystemApi;
+import android.content.Context;
+import android.os.Binder;
+import android.provider.UpdatableDeviceConfigServiceReadiness;
+
+import com.android.server.SystemService;
+
+/** @hide */
+@SystemApi(client = SystemApi.Client.SYSTEM_SERVER)
+public class DeviceConfigInit {
+
+    private DeviceConfigInit() {
+        // do not instantiate
+    }
+
+    /** @hide */
+    @SystemApi(client = SystemApi.Client.SYSTEM_SERVER)
+    public static class Lifecycle extends SystemService {
+        private DeviceConfigShellService mShellService;
+
+        /** @hide */
+        @SystemApi(client = SystemApi.Client.SYSTEM_SERVER)
+        public Lifecycle(@NonNull Context context) {
+            super(context);
+            // this service is always instantiated but should only launch subsequent services
+            // if the module is ready
+            if (UpdatableDeviceConfigServiceReadiness.shouldStartUpdatableService()) {
+                mShellService = new DeviceConfigShellService();
+            }
+        }
+
+        /** @hide */
+        @Override
+        public void onStart() {
+            if (UpdatableDeviceConfigServiceReadiness.shouldStartUpdatableService()) {
+                publishBinderService("device_config", mShellService);
+            }
+        }
+    }
+}
diff --git a/service/java/com/android/server/deviceconfig/DeviceConfigShellService.java b/service/java/com/android/server/deviceconfig/DeviceConfigShellService.java
new file mode 100644
index 0000000..14ced76
--- /dev/null
+++ b/service/java/com/android/server/deviceconfig/DeviceConfigShellService.java
@@ -0,0 +1,40 @@
+package com.android.server.deviceconfig;
+
+import java.io.PrintWriter;
+
+import android.annotation.NonNull;
+import android.os.Binder;
+import android.os.ParcelFileDescriptor;
+
+import com.android.modules.utils.BasicShellCommandHandler;
+
+/** @hide */
+public class DeviceConfigShellService extends Binder {
+
+    @Override
+    public int handleShellCommand(@NonNull ParcelFileDescriptor in,
+            @NonNull ParcelFileDescriptor out, @NonNull ParcelFileDescriptor err,
+            @NonNull String[] args) {
+        return (new MyShellCommand()).exec(
+                this, in.getFileDescriptor(), out.getFileDescriptor(), err.getFileDescriptor(),
+                args);
+    }
+
+    static final class MyShellCommand extends BasicShellCommandHandler {
+
+        @Override
+        public int onCommand(String cmd) {
+            if (cmd == null || "help".equals(cmd) || "-h".equals(cmd)) {
+                onHelp();
+                return -1;
+            }
+            return -1;
+        }
+
+        @Override
+        public void onHelp() {
+            PrintWriter pw = getOutPrintWriter();
+            pw.println("Device Config implemented in mainline");
+        }
+    }
+}