Make QmlDebug protocol more robust

The protocol so far was client->server only. That is, there was no
sane way for a client to check whether a plugin on the server (service)
was available or not. E.g. calling Client::setEnabled(true) 'succeeded',
without a check whether there is actually a service to talk to.

The new protocol replaces this shortcoming by a service discovery
mechanism: Both client & service announce their available plugins at
handshake time, and later on if there are changes. The status is
reflected in Client::status() and Service::Status() , which are either

  NotConnected - no network connection, or not registered properly
  Unavailable - TCP/IP connection works, but no plugin with the same
name on the other side
  Enabled - You can connect to plugin on other side

The status changes happen automatically (no setEnabled() anymore).

Furthermore a version ID was added to the handshake, so that we can
extend the protocol further in the future :)
(cherry picked from commit fd9771c29d401d88779ab7c5d7715c9ca41dd723)

5 files changed, 58 insertions, 69 deletions

diff --git a/tests/auto/declarative/qdeclarativedebug/tst_qdeclarativedebug.cpp b/tests/auto/declarative/qdeclarativedebug/tst_qdeclarativedebug.cpp
index 4a5bdf2..e6a81b8 100644
--- a/tests/auto/declarative/qdeclarativedebug/tst_qdeclarativedebug.cpp
+++ b/tests/auto/declarative/qdeclarativedebug/tst_qdeclarativedebug.cpp
@@ -324,13 +324,16 @@ void tst_QDeclarativeDebug::initTestCase()
     bool ok = m_conn->waitForConnected();
     Q_ASSERT(ok);
     QTRY_VERIFY(QDeclarativeDebugService::hasDebuggingClient());
-
     m_dbg = new QDeclarativeEngineDebug(m_conn, this);
+    QTRY_VERIFY(m_dbg->status() == QDeclarativeEngineDebug::Enabled);
 }
 
 void tst_QDeclarativeDebug::cleanupTestCase()
 {
+    delete m_dbg;
+    delete m_conn;
     qDeleteAll(m_components);
+    delete m_engine;
 }
 
 void tst_QDeclarativeDebug::setMethodBody()
diff --git a/tests/auto/declarative/qdeclarativedebugclient/tst_qdeclarativedebugclient.cpp b/tests/auto/declarative/qdeclarativedebugclient/tst_qdeclarativedebugclient.cpp
index 7db0e60..72af3eb 100644
--- a/tests/auto/declarative/qdeclarativedebugclient/tst_qdeclarativedebugclient.cpp
+++ b/tests/auto/declarative/qdeclarativedebugclient/tst_qdeclarativedebugclient.cpp
@@ -66,9 +66,7 @@ private slots:
     void initTestCase();
 
     void name();
-    void isEnabled();
-    void setEnabled();
-    void isConnected();
+    void status();
     void sendMessage();
 };
 
@@ -96,46 +94,33 @@ void tst_QDeclarativeDebugClient::name()
     QCOMPARE(client.name(), name);
 }
 
-void tst_QDeclarativeDebugClient::isEnabled()
+void tst_QDeclarativeDebugClient::status()
 {
-    QDeclarativeDebugClient client("tst_QDeclarativeDebugClient::isEnabled()", m_conn);
-    QCOMPARE(client.isEnabled(), false);
-}
+    {
+        QDeclarativeDebugConnection dummyConn;
+        QDeclarativeDebugClient client("tst_QDeclarativeDebugClient::status()", &dummyConn);
+        QCOMPARE(client.status(), QDeclarativeDebugClient::NotConnected);
+    }
 
-void tst_QDeclarativeDebugClient::setEnabled()
-{
-    QDeclarativeDebugTestService service("tst_QDeclarativeDebugClient::setEnabled()");
-    QDeclarativeDebugTestClient client("tst_QDeclarativeDebugClient::setEnabled()", m_conn);
+    QDeclarativeDebugTestClient client("tst_QDeclarativeDebugClient::status()", m_conn);
+    QCOMPARE(client.status(), QDeclarativeDebugClient::Unavailable);
 
-    QCOMPARE(service.isEnabled(), false);
+    {
+        QDeclarativeDebugTestService service("tst_QDeclarativeDebugClient::status()");
+        QDeclarativeDebugTest::waitForSignal(&client, SIGNAL(statusHasChanged()));
+        QCOMPARE(client.status(), QDeclarativeDebugClient::Enabled);
+    }
+    QDeclarativeDebugTest::waitForSignal(&client, SIGNAL(statusHasChanged()));
 
-    client.setEnabled(true);
-    QCOMPARE(client.isEnabled(), true);
-    QDeclarativeDebugTest::waitForSignal(&service, SIGNAL(enabledStateChanged()));
-    QCOMPARE(service.isEnabled(), true);
-
-    client.setEnabled(false);
-    QCOMPARE(client.isEnabled(), false);
-    QDeclarativeDebugTest::waitForSignal(&service, SIGNAL(enabledStateChanged()));
-    QCOMPARE(service.isEnabled(), false);
-}
-
-void tst_QDeclarativeDebugClient::isConnected()
-{
-    QDeclarativeDebugClient client1("tst_QDeclarativeDebugClient::isConnected() A", m_conn);
-    QCOMPARE(client1.isConnected(), true);
-
-    QDeclarativeDebugConnection conn;
-    QDeclarativeDebugClient client2("tst_QDeclarativeDebugClient::isConnected() B", &conn);
-    QCOMPARE(client2.isConnected(), false);
-
-    QDeclarativeDebugClient client3("tst_QDeclarativeDebugClient::isConnected() C", 0);
-    QCOMPARE(client3.isConnected(), false);
+    QCOMPARE(client.status(), QDeclarativeDebugClient::Unavailable);
 
     // duplicate plugin name
-    QTest::ignoreMessage(QtWarningMsg, "QDeclarativeDebugClient: Conflicting plugin name \"tst_QDeclarativeDebugClient::isConnected() A\" ");
-    QDeclarativeDebugClient client4("tst_QDeclarativeDebugClient::isConnected() A", m_conn);
-    QCOMPARE(client4.isConnected(), false);
+    QTest::ignoreMessage(QtWarningMsg, "QDeclarativeDebugClient: Conflicting plugin name \"tst_QDeclarativeDebugClient::status()\" ");
+    QDeclarativeDebugClient client2("tst_QDeclarativeDebugClient::status()", m_conn);
+    QCOMPARE(client2.status(), QDeclarativeDebugClient::NotConnected);
+
+    QDeclarativeDebugClient client3("tst_QDeclarativeDebugClient::status3()", 0);
+    QCOMPARE(client3.status(), QDeclarativeDebugClient::NotConnected);
 }
 
 void tst_QDeclarativeDebugClient::sendMessage()
@@ -145,6 +130,7 @@ void tst_QDeclarativeDebugClient::sendMessage()
 
     QByteArray msg = "hello!";
 
+    QDeclarativeDebugTest::waitForSignal(&client, SIGNAL(statusHasChanged()));
     client.sendMessage(msg);
     QByteArray resp = client.waitForResponse();
     QCOMPARE(resp, msg);
diff --git a/tests/auto/declarative/qdeclarativedebugservice/tst_qdeclarativedebugservice.cpp b/tests/auto/declarative/qdeclarativedebugservice/tst_qdeclarativedebugservice.cpp
index 70679b9..945823a 100644
--- a/tests/auto/declarative/qdeclarativedebugservice/tst_qdeclarativedebugservice.cpp
+++ b/tests/auto/declarative/qdeclarativedebugservice/tst_qdeclarativedebugservice.cpp
@@ -66,8 +66,7 @@ private slots:
     void initTestCase();
 
     void name();
-    void isEnabled();
-    void enabledChanged();
+    void status();
     void sendMessage();
     void idForObject();
     void objectForId();
@@ -97,31 +96,24 @@ void tst_QDeclarativeDebugService::name()
     QCOMPARE(service.name(), name);
 }
 
-void tst_QDeclarativeDebugService::isEnabled()
+void tst_QDeclarativeDebugService::status()
 {
-    QDeclarativeDebugTestService service("tst_QDeclarativeDebugService::isEnabled()", m_conn);
-    QCOMPARE(service.isEnabled(), false);
+    QDeclarativeDebugTestService service("tst_QDeclarativeDebugService::status()");
+    QCOMPARE(service.status(), QDeclarativeDebugService::Unavailable);
 
-    QDeclarativeDebugTestClient client("tst_QDeclarativeDebugService::isEnabled()", m_conn);
-    client.setEnabled(true);
-    QDeclarativeDebugTest::waitForSignal(&service, SIGNAL(enabledStateChanged()));
-    QCOMPARE(service.isEnabled(), true);
+    {
+        QDeclarativeDebugTestClient client("tst_QDeclarativeDebugService::status()", m_conn);
+        QDeclarativeDebugTest::waitForSignal(&service, SIGNAL(statusHasChanged()));
+        QCOMPARE(service.status(), QDeclarativeDebugService::Enabled);
+    }
 
-    QTest::ignoreMessage(QtWarningMsg, "QDeclarativeDebugService: Conflicting plugin name \"tst_QDeclarativeDebugService::isEnabled()\" ");
-    QDeclarativeDebugService duplicate("tst_QDeclarativeDebugService::isEnabled()", m_conn);
-    QCOMPARE(duplicate.isEnabled(), false);
-}
-
-void tst_QDeclarativeDebugService::enabledChanged()
-{
-    QDeclarativeDebugTestService service("tst_QDeclarativeDebugService::enabledChanged()");
-    QDeclarativeDebugTestClient client("tst_QDeclarativeDebugService::enabledChanged()", m_conn);
+    QDeclarativeDebugTest::waitForSignal(&service, SIGNAL(statusHasChanged()));
+    QCOMPARE(service.status(), QDeclarativeDebugService::Unavailable);
 
-    QCOMPARE(service.enabled, false);
+    QTest::ignoreMessage(QtWarningMsg, "QDeclarativeDebugService: Conflicting plugin name \"tst_QDeclarativeDebugService::status()\" ");
 
-    client.setEnabled(true);
-    QDeclarativeDebugTest::waitForSignal(&service, SIGNAL(enabledStateChanged()));
-    QCOMPARE(service.enabled, true);
+    QDeclarativeDebugService duplicate("tst_QDeclarativeDebugService::status()");
+    QCOMPARE(duplicate.status(), QDeclarativeDebugService::NotConnected);
 }
 
 void tst_QDeclarativeDebugService::sendMessage()
@@ -131,6 +123,11 @@ void tst_QDeclarativeDebugService::sendMessage()
 
     QByteArray msg = "hello!";
 
+    if (service.status() != QDeclarativeDebugService::Enabled)
+        QDeclarativeDebugTest::waitForSignal(&service, SIGNAL(statusHasChanged()));
+    if (client.status() != QDeclarativeDebugClient::Enabled)
+        QDeclarativeDebugTest::waitForSignal(&client, SIGNAL(statusHasChanged()));
+
     client.sendMessage(msg);
     QByteArray resp = client.waitForResponse();
     QCOMPARE(resp, msg);
diff --git a/tests/auto/declarative/shared/debugutil.cpp b/tests/auto/declarative/shared/debugutil.cpp
index c0c3eca..5f68e44 100644
--- a/tests/auto/declarative/shared/debugutil.cpp
+++ b/tests/auto/declarative/shared/debugutil.cpp
@@ -60,7 +60,7 @@ bool QDeclarativeDebugTest::waitForSignal(QObject *receiver, const char *member,
 }
 
 QDeclarativeDebugTestService::QDeclarativeDebugTestService(const QString &s, QObject *parent)
-    : QDeclarativeDebugService(s, parent), enabled(false)
+    : QDeclarativeDebugService(s, parent)
 {
 }
 
@@ -69,10 +69,9 @@ void QDeclarativeDebugTestService::messageReceived(const QByteArray &ba)
     sendMessage(ba);
 }
 
-void QDeclarativeDebugTestService::enabledChanged(bool e)
+void QDeclarativeDebugTestService::statusChanged(Status)
 {
-    enabled = e;
-    emit enabledStateChanged();
+    emit statusHasChanged();
 }
 
 
@@ -92,9 +91,13 @@ QByteArray QDeclarativeDebugTestClient::waitForResponse()
     return lastMsg;
 }
 
+void QDeclarativeDebugTestClient::statusChanged(Status status)
+{
+    emit statusHasChanged();
+}
+
 void QDeclarativeDebugTestClient::messageReceived(const QByteArray &ba)
 {
     lastMsg = ba;
     emit serverMessage(ba);
 }
-
diff --git a/tests/auto/declarative/shared/debugutil_p.h b/tests/auto/declarative/shared/debugutil_p.h
index e6bb7ad..434e053 100644
--- a/tests/auto/declarative/shared/debugutil_p.h
+++ b/tests/auto/declarative/shared/debugutil_p.h
@@ -62,15 +62,13 @@ class QDeclarativeDebugTestService : public QDeclarativeDebugService
     Q_OBJECT
 public:
     QDeclarativeDebugTestService(const QString &s, QObject *parent = 0);
-    bool enabled;
 
 signals:
-    void enabledStateChanged();
+    void statusHasChanged();
 
 protected:
     virtual void messageReceived(const QByteArray &ba);
-
-    virtual void enabledChanged(bool e);
+    virtual void statusChanged(Status status);
 };
 
 class QDeclarativeDebugTestClient : public QDeclarativeDebugClient
@@ -82,9 +80,11 @@ public:
     QByteArray waitForResponse();
 
 signals:
+    void statusHasChanged();
     void serverMessage(const QByteArray &);
 
 protected:
+    virtual void statusChanged(Status status);
     virtual void messageReceived(const QByteArray &ba);
 
 private: