[android] stop immediatly if no transit tunnels available while graceful shutdown

Signed-off-by: R4SAS <r4sas@i2pmail.org>

android/jni/i2pd_android.cpp

@@ -4,6 +4,7 @@
 #include "RouterContext.h"
 #include "ClientContext.h"
 #include "Transports.h"
+#include "Tunnel.h"
 
 JNIEXPORT jstring JNICALL Java_org_purplei2p_i2pd_I2PD_1JNI_getABICompiledWith
 	(JNIEnv *env, jclass clazz) {
@@ -98,3 +99,8 @@ JNIEXPORT void JNICALL Java_org_purplei2p_i2pd_I2PD_1JNI_setDataDir
 	// Set DataDir
 	i2p::android::SetDataDir(dataDir);
 }
+
+JNIEXPORT jint JNICALL Java_org_purplei2p_i2pd_I2PD_1JNI_GetTransitTunnelsCount
+	(JNIEnv *env, jclass clazz) {
+	return i2p::tunnel::tunnels.CountTransitTunnels();
+}

android/jni/org_purplei2p_i2pd_I2PD_JNI.h

@@ -36,6 +36,9 @@ JNIEXPORT void JNICALL Java_org_purplei2p_i2pd_I2PD_1JNI_onNetworkStateChanged
 JNIEXPORT void JNICALL Java_org_purplei2p_i2pd_I2PD_1JNI_setDataDir
 	(JNIEnv *env, jclass clazz, jstring jdataDir);
 
+JNIEXPORT jint JNICALL Java_org_purplei2p_i2pd_I2PD_1JNI_GetTransitTunnelsCount
+	(JNIEnv *, jclass);
+
 #ifdef __cplusplus
 }
 #endif

android/src/org/purplei2p/i2pd/DaemonSingleton.java

@@ -65,6 +65,10 @@ public class DaemonSingleton {
 		}
 	}
 
+	public synchronized int GetTransitTunnelsCount() {
+		return I2PD_JNI.GetTransitTunnelsCount();
+	}
+
 	private volatile boolean startedOkay;
 
 	public enum State {

android/src/org/purplei2p/i2pd/I2PDActivity.java

@@ -373,6 +373,11 @@ public class I2PDActivity extends Activity {
 		if (gracefulQuitTimerOld != null)
 			gracefulQuitTimerOld.cancel();
 
+		if(daemon.GetTransitTunnelsCount() <= 0) { // no tunnels left
+			Log.d(TAG, "no transit tunnels left, stopping");
+			i2pdStop();
+		}
+
 		final Timer gracefulQuitTimer = new Timer(true);
 		setGracefulQuitTimer(gracefulQuitTimer);
 		gracefulQuitTimer.schedule(new TimerTask() {

android/src/org/purplei2p/i2pd/I2PD_JNI.java

@@ -22,6 +22,8 @@ public class I2PD_JNI {
 
 	public static native void setDataDir(String jdataDir);
 
+	public static native int GetTransitTunnelsCount();
+
 	public static void loadLibraries() {
 		//System.loadLibrary("c++_shared");
 		System.loadLibrary("i2pd");