1 files changed, 166 insertions, 0 deletions
diff --git a/app/src/main/java/com/wireguard/android/model/Tunnel.java b/app/src/main/java/com/wireguard/android/model/Tunnel.java
new file mode 100644
index 00000000..b196eaa5
--- /dev/null
+++ b/app/src/main/java/com/wireguard/android/model/Tunnel.java
@@ -0,0 +1,166 @@
+package com.wireguard.android.model;
+
+import android.databinding.BaseObservable;
+import android.databinding.Bindable;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import com.wireguard.android.BR;
+import com.wireguard.android.backend.Backend;
+import com.wireguard.android.configStore.ConfigStore;
+import com.wireguard.android.util.ExceptionLoggers;
+import com.wireguard.config.Config;
+
+import org.threeten.bp.Instant;
+
+import java.util.Objects;
+import java.util.regex.Pattern;
+
+import java9.util.concurrent.CompletableFuture;
+import java9.util.concurrent.CompletionStage;
+
+/**
+ * Encapsulates the volatile and nonvolatile state of a WireGuard tunnel.
+ */
+
+public class Tunnel extends BaseObservable implements Comparable<Tunnel> {
+    public static final int NAME_MAX_LENGTH = 16;
+    private static final Pattern NAME_PATTERN = Pattern.compile("[a-zA-Z0-9_=+.-]{1,16}");
+    private static final String TAG = Tunnel.class.getSimpleName();
+
+    private final Backend backend;
+    private final ConfigStore configStore;
+    private final String name;
+    private Config config;
+    private Instant lastStateChange = Instant.EPOCH;
+    private State state = State.UNKNOWN;
+    private Statistics statistics;
+
+    Tunnel(@NonNull final Backend backend, @NonNull final ConfigStore configStore,
+           @NonNull final String name, @Nullable final Config config) {
+        this.backend = backend;
+        this.configStore = configStore;
+        this.name = name;
+        this.config = config;
+    }
+
+    public static boolean isNameValid(final CharSequence name) {
+        return name != null && NAME_PATTERN.matcher(name).matches();
+    }
+
+    @Override
+    public int compareTo(@NonNull final Tunnel tunnel) {
+        return name.compareTo(tunnel.name);
+    }
+
+    @Bindable
+    public Config getConfig() {
+        if (config == null)
+            getConfigAsync().whenComplete(ExceptionLoggers.D);
+        return config;
+    }
+
+    public CompletionStage<Config> getConfigAsync() {
+        if (config == null)
+            return configStore.load(name).thenApply(this::setConfigInternal);
+        return CompletableFuture.completedFuture(config);
+    }
+
+    @Bindable
+    public Instant getLastStateChange() {
+        return lastStateChange;
+    }
+
+    @Bindable
+    public String getName() {
+        return name;
+    }
+
+    @Bindable
+    public State getState() {
+        if (state == State.UNKNOWN)
+            getStateAsync().whenComplete(ExceptionLoggers.D);
+        return state;
+    }
+
+    public CompletionStage<State> getStateAsync() {
+        if (state == State.UNKNOWN)
+            return backend.getState(this).thenApply(this::setStateInternal);
+        return CompletableFuture.completedFuture(state);
+    }
+
+    @Bindable
+    public Statistics getStatistics() {
+        // FIXME: Check age of statistics.
+        if (statistics == null)
+            getStatisticsAsync().whenComplete(ExceptionLoggers.D);
+        return statistics;
+    }
+
+    public CompletionStage<Statistics> getStatisticsAsync() {
+        // FIXME: Check age of statistics.
+        if (statistics == null)
+            return backend.getStatistics(this).thenApply(this::setStatisticsInternal);
+        return CompletableFuture.completedFuture(statistics);
+    }
+
+    private void onStateChanged(final State oldState, final State newState) {
+        if (oldState != State.UNKNOWN) {
+            lastStateChange = Instant.now();
+            notifyPropertyChanged(BR.lastStateChange);
+        }
+        if (newState != State.UP)
+            setStatisticsInternal(null);
+    }
+
+    public CompletionStage<Config> setConfig(@NonNull final Config config) {
+        if (!config.equals(this.config)) {
+            return backend.applyConfig(this, config)
+                    .thenCompose(cfg -> configStore.save(name, cfg))
+                    .thenApply(this::setConfigInternal);
+        }
+        return CompletableFuture.completedFuture(this.config);
+    }
+
+    private Config setConfigInternal(final Config config) {
+        if (Objects.equals(this.config, config))
+            return config;
+        this.config = config;
+        notifyPropertyChanged(BR.config);
+        return config;
+    }
+
+    public CompletionStage<State> setState(@NonNull final State state) {
+        if (state != this.state)
+            return backend.setState(this, state)
+                    .thenApply(this::setStateInternal);
+        return CompletableFuture.completedFuture(this.state);
+    }
+
+    private State setStateInternal(final State state) {
+        if (Objects.equals(this.state, state))
+            return state;
+        onStateChanged(this.state, state);
+        this.state = state;
+        notifyPropertyChanged(BR.state);
+        return state;
+    }
+
+    private Statistics setStatisticsInternal(final Statistics statistics) {
+        if (Objects.equals(this.statistics, statistics))
+            return statistics;
+        this.statistics = statistics;
+        notifyPropertyChanged(BR.statistics);
+        return statistics;
+    }
+
+    public enum State {
+        DOWN,
+        TOGGLE,
+        UNKNOWN,
+        UP
+    }
+
+    public static class Statistics extends BaseObservable {
+    }
+}