Serviceless rewrite, part 1

Signed-off-by: Samuel Holland <samuel@sholland.org>

1 files changed, 111 insertions, 0 deletions

diff --git a/app/src/main/java/com/wireguard/android/model/TunnelManager.java b/app/src/main/java/com/wireguard/android/model/TunnelManager.java
new file mode 100644
index 00000000..5122f9bf
--- /dev/null
+++ b/app/src/main/java/com/wireguard/android/model/TunnelManager.java
@@ -0,0 +1,111 @@
+package com.wireguard.android.model;
+
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import com.wireguard.android.Application.ApplicationScope;
+import com.wireguard.android.backend.Backend;
+import com.wireguard.android.configStore.ConfigStore;
+import com.wireguard.android.model.Tunnel.State;
+import com.wireguard.android.util.ExceptionLoggers;
+import com.wireguard.config.Config;
+
+import java.util.Collections;
+import java.util.Set;
+
+import javax.inject.Inject;
+
+import java9.util.concurrent.CompletableFuture;
+import java9.util.concurrent.CompletionStage;
+import java9.util.stream.Collectors;
+import java9.util.stream.StreamSupport;
+
+/**
+ * Maintains and mediates changes to the set of available WireGuard tunnels,
+ */
+
+@ApplicationScope
+public final class TunnelManager {
+    public static final String KEY_PRIMARY_TUNNEL = "primary_config";
+    public static final String KEY_SELECTED_TUNNEL = "selected_tunnel";
+    private static final String KEY_RESTORE_ON_BOOT = "restore_on_boot";
+    private static final String KEY_RUNNING_TUNNELS = "enabled_configs";
+    private static final String TAG = TunnelManager.class.getSimpleName();
+
+    private final Backend backend;
+    private final ConfigStore configStore;
+    private final SharedPreferences preferences;
+    private final TunnelCollection tunnels = new TunnelCollection();
+
+    @Inject
+    public TunnelManager(final Backend backend, final ConfigStore configStore,
+                         final SharedPreferences preferences) {
+        this.backend = backend;
+        this.configStore = configStore;
+        this.preferences = preferences;
+    }
+
+    private Tunnel add(final String name, final Config config) {
+        final Tunnel tunnel = new Tunnel(backend, configStore, name, config);
+        tunnels.put(name, tunnel);
+        return tunnel;
+    }
+
+    private Tunnel add(final String name) {
+        return add(name, null);
+    }
+
+    public CompletionStage<Tunnel> create(final String name, final Config config) {
+        Log.v(TAG, "Requested create tunnel " + name + " with config\n" + config);
+        if (!Tunnel.isNameValid(name))
+            return CompletableFuture.failedFuture(new IllegalArgumentException("Invalid name"));
+        if (tunnels.containsKey(name)) {
+            final String message = "Tunnel " + name + " already exists";
+            return CompletableFuture.failedFuture(new IllegalArgumentException(message));
+        }
+        return configStore.create(name, config).thenApply(savedConfig -> add(name, savedConfig));
+    }
+
+    public CompletionStage<Void> delete(final Tunnel tunnel) {
+        Log.v(TAG, "Requested delete tunnel " + tunnel.getName() + " state=" + tunnel.getState());
+        return backend.setState(tunnel, State.DOWN)
+                .thenCompose(x -> configStore.delete(tunnel.getName()))
+                .thenAccept(x -> tunnels.remove(tunnel.getName()));
+    }
+
+    public TunnelCollection getTunnels() {
+        return tunnels;
+    }
+
+    public void onCreate() {
+        Log.v(TAG, "onCreate triggered");
+        configStore.enumerate()
+                .thenApply(names -> StreamSupport.stream(names)
+                        .map(this::add)
+                        .map(Tunnel::getStateAsync)
+                        .toArray(CompletableFuture[]::new))
+                .thenCompose(CompletableFuture::allOf)
+                .whenComplete(ExceptionLoggers.E);
+    }
+
+    public CompletionStage<Void> restoreState() {
+        if (!preferences.getBoolean(KEY_RESTORE_ON_BOOT, false))
+            return CompletableFuture.completedFuture(null);
+        final Set<String> tunnelsToEnable =
+                preferences.getStringSet(KEY_RUNNING_TUNNELS, Collections.emptySet());
+        final CompletableFuture[] futures = StreamSupport.stream(tunnelsToEnable)
+                .map(tunnels::get)
+                .map(tunnel -> tunnel.setState(State.UP))
+                .toArray(CompletableFuture[]::new);
+        return CompletableFuture.allOf(futures);
+    }
+
+    public CompletionStage<Void> saveState() {
+        final Set<String> runningTunnels = StreamSupport.stream(tunnels.values())
+                .filter(tunnel -> tunnel.getState() == State.UP)
+                .map(Tunnel::getName)
+                .collect(Collectors.toUnmodifiableSet());
+        preferences.edit().putStringSet(KEY_RUNNING_TUNNELS, runningTunnels).apply();
+        return CompletableFuture.completedFuture(null);
+    }
+}