request domain settings after successful connection to domain

libraries/networking/src/DomainHandler.cpp

@@ -9,6 +9,8 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
+#include <QtCore/QJsonDocument>
+
 #include "NodeList.h"
 #include "PacketHeaders.h"
 #include "UserActivityLogger.h"
@@ -21,7 +23,9 @@ DomainHandler::DomainHandler(QObject* parent) :
     _sockAddr(HifiSockAddr(QHostAddress::Null, DEFAULT_DOMAIN_SERVER_PORT)),
     _assignmentUUID(),
     _isConnected(false),
-    _handshakeTimer(NULL)
+    _handshakeTimer(NULL),
+    _settingsObject(),
+    _failedSettingsRequests(0)
 {
     
 }
@@ -37,8 +41,14 @@ void DomainHandler::clearConnectionInfo() {
     }
 }
 
+void DomainHandler::clearSettings() {
+    _settingsObject = QJsonObject();
+    _failedSettingsRequests = 0;
+}
+
 void DomainHandler::reset() {
     clearConnectionInfo();
+    clearSettings();
     _hostname = QString();
     _sockAddr.setAddress(QHostAddress::Null);
 }
@@ -109,10 +119,58 @@ void DomainHandler::setIsConnected(bool isConnected) {
         
         if (_isConnected) {
             emit connectedToDomain(_hostname);
+            
+            // we've connected to new domain - time to ask it for global settings
+            requestDomainSettings();
         }
     }
 }
 
+void DomainHandler::requestDomainSettings() const {
+    
+    // setup the URL required to grab settings JSON
+    QUrl settingsJSONURL;
+    settingsJSONURL.setScheme("http");
+    settingsJSONURL.setHost(_hostname);
+    settingsJSONURL.setPort(DOMAIN_SERVER_HTTP_PORT);
+    settingsJSONURL.setPath("/settings.json");
+    settingsJSONURL.setQuery(QString("type=%1").arg(NodeList::getInstance()->getOwnerType()));
+    
+    qDebug() << settingsJSONURL;
+    
+    QNetworkReply* reply = NetworkAccessManager::getInstance().get(QNetworkRequest(settingsJSONURL));
+    connect(reply, &QNetworkReply::finished, this, &DomainHandler::settingsRequestFinished);
+}
+
+const int MAX_SETTINGS_REQUEST_FAILED_ATTEMPTS = 5;
+
+void DomainHandler::settingsRequestFinished() {
+    QNetworkReply* settingsReply = reinterpret_cast<QNetworkReply*>(sender());
+    
+    if (settingsReply->error() == QNetworkReply::NoError) {
+        // parse the JSON to a QJsonObject and save it
+        _settingsObject = QJsonDocument::fromJson(settingsReply->readAll()).object();
+        
+        qDebug() << settingsReply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
+        qDebug() << "Received domain settings.";
+        
+        // reset failed settings requests to 0, we got them
+        _failedSettingsRequests = 0;
+    } else {
+        // error grabbing the settings - in some cases this means we are stuck
+        // so we should retry until we get it
+        qDebug() << "Error getting domain settings -" << settingsReply->errorString() << "- retrying";
+        
+        if (++_failedSettingsRequests >= MAX_SETTINGS_REQUEST_FAILED_ATTEMPTS) {
+            qDebug() << "Failed to retreive domain-server settings" << MAX_SETTINGS_REQUEST_FAILED_ATTEMPTS << "times. Re-setting connection to domain.";
+            clearSettings();
+            clearConnectionInfo();
+        }
+        
+        requestDomainSettings();
+    }
+}
+
 void DomainHandler::parseDTLSRequirementPacket(const QByteArray& dtlsRequirementPacket) {
     // figure out the port that the DS wants us to use for us to talk to them with DTLS
     int numBytesPacketHeader = numBytesForPacketHeader(dtlsRequirementPacket);

libraries/networking/src/DomainHandler.h

@@ -12,6 +12,7 @@
 #ifndef hifi_DomainHandler_h
 #define hifi_DomainHandler_h
 
+#include <QtCore/QJsonObject>
 #include <QtCore/QObject>
 #include <QtCore/QTimer>
 #include <QtCore/QUuid>
@@ -33,6 +34,7 @@ public:
     DomainHandler(QObject* parent = 0);
     
     void clearConnectionInfo();
+    void clearSettings();
     
     const QUuid& getUUID() const { return _uuid; }
     void setUUID(const QUuid& uuid) { _uuid = uuid; }
@@ -54,10 +56,14 @@ public:
     bool isConnected() const { return _isConnected; }
     void setIsConnected(bool isConnected);
     
+    bool hasSettings() const { return !_settingsObject.isEmpty(); }
+    void requestDomainSettings() const;
+    
     void parseDTLSRequirementPacket(const QByteArray& dtlsRequirementPacket);
     
 private slots:
     void completedHostnameLookup(const QHostInfo& hostInfo);
+    void settingsRequestFinished();
 signals:
     void hostnameChanged(const QString& hostname);
     void connectedToDomain(const QString& hostname);
@@ -71,6 +77,8 @@ private:
     QUuid _assignmentUUID;
     bool _isConnected;
     QTimer* _handshakeTimer;
+    QJsonObject _settingsObject;
+    int _failedSettingsRequests;
 };
 
 #endif // hifi_DomainHandler_h