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Date: 2021-03-26 12:19:53 Functions: 0 0 -
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           Branch data     Line data    Source code
       1                 :            : /***************************************************************************
       2                 :            :     qgsgeonoderequest.h
       3                 :            :     ---------------------
       4                 :            :     begin                : Jul 2017
       5                 :            :     copyright            : (C) 2017 by Muhammad Yarjuna Rohmat, Ismail Sunni
       6                 :            :     email                : rohmat at kartoza dot com, ismail at kartoza dot com
       7                 :            :  ***************************************************************************
       8                 :            :  *                                                                         *
       9                 :            :  *   This program is free software; you can redistribute it and/or modify  *
      10                 :            :  *   it under the terms of the GNU General Public License as published by  *
      11                 :            :  *   the Free Software Foundation; either version 2 of the License, or     *
      12                 :            :  *   (at your option) any later version.                                   *
      13                 :            :  *                                                                         *
      14                 :            :  ***************************************************************************/
      15                 :            : #ifndef QGSGEONODEREQUEST_H
      16                 :            : #define QGSGEONODEREQUEST_H
      17                 :            : 
      18                 :            : #include "qgis.h"
      19                 :            : #include "qgis_core.h"
      20                 :            : #include <QNetworkReply>
      21                 :            : #include <QDomDocument>
      22                 :            : #include <QObject>
      23                 :            : #include <QUuid>
      24                 :            : 
      25                 :            : /**
      26                 :            :  * \ingroup core
      27                 :            :  * \class QgsGeoNodeStyle
      28                 :            :  * \brief Encapsulates information about a GeoNode layer style.
      29                 :            :  * \since QGIS 3.0
      30                 :            :  */
      31                 :          0 : struct CORE_EXPORT QgsGeoNodeStyle
      32                 :            : {
      33                 :            : #ifdef SIP_RUN
      34                 :            :   % TypeHeaderCode
      35                 :            : #include <qgsgeonoderequest.h>
      36                 :            :   % End
      37                 :            : #endif
      38                 :            : 
      39                 :            :   //! Unique style ID
      40                 :            :   QString id;
      41                 :            : 
      42                 :            :   //! Style name
      43                 :            :   QString name;
      44                 :            : 
      45                 :            :   //! Style title
      46                 :            :   QString title;
      47                 :            : 
      48                 :            :   //! DOM documenting containing style
      49                 :            :   QDomDocument body;
      50                 :            : 
      51                 :            :   //! Associated URL
      52                 :            :   QString styleUrl;
      53                 :            : };
      54                 :            : 
      55                 :            : /**
      56                 :            :  * \ingroup core
      57                 :            :  * \class QgsGeoNodeRequest
      58                 :            :  * \brief Request handler for GeoNode servers.
      59                 :            :  *
      60                 :            :  * QgsGeoNodeRequest handles requesting and parsing service details from a GeoNode
      61                 :            :  * server instance, for instance requesting all available layers or layer styles.
      62                 :            :  *
      63                 :            :  * \since QGIS 3.0
      64                 :            :  */
      65                 :            : class CORE_EXPORT QgsGeoNodeRequest : public QObject
      66                 :            : {
      67                 :          0 :     Q_OBJECT
      68                 :            :   public:
      69                 :            : 
      70                 :            :     /**
      71                 :            :      * GeoNode backend server type.
      72                 :            :      */
      73                 :            :     enum class BackendServer
      74                 :            :     {
      75                 :            :       Unknown, //!< Unknown backend
      76                 :            :       QgisServer, //!< QGIS server used as backend
      77                 :            :       Geoserver //!< Geoserver used as backend
      78                 :            :     };
      79                 :            : 
      80                 :            :     /**
      81                 :            :      * Service layer details for an individual layer from a GeoNode connection.
      82                 :            :      */
      83                 :          0 :     struct ServiceLayerDetail
      84                 :            :     {
      85                 :            :       //! Unique identifier (generate on the client side, not at the GeoNode server)
      86                 :            :       QUuid uuid;
      87                 :            :       //! Layer id
      88                 :            :       QString id;
      89                 :            :       //! Layer name
      90                 :            :       QString name;
      91                 :            :       //! Layer type name
      92                 :            :       QString typeName;
      93                 :            :       //! Layer title
      94                 :            :       QString title;
      95                 :            :       //! WMS URL for layer
      96                 :            :       QString wmsURL;
      97                 :            :       //! WFS URL for layer
      98                 :            :       QString wfsURL;
      99                 :            :       //! XYZ tileserver URL for layer
     100                 :            :       QString xyzURL;
     101                 :            :       //! Backend server (geoserver or qgis-server)
     102                 :          0 :       BackendServer server{};
     103                 :            :     };
     104                 :            : 
     105                 :            :     /**
     106                 :            :      * Constructor for QgsGeoNodeRequest.
     107                 :            :      *
     108                 :            :      * If \a forceRefresh is FALSE, then cached copies of the request may be reused.
     109                 :            :      */
     110                 :            :     QgsGeoNodeRequest( const QString &baseUrl, bool forceRefresh, QObject *parent = nullptr );
     111                 :            : 
     112                 :            :     ~QgsGeoNodeRequest() override;
     113                 :            : 
     114                 :            :     /**
     115                 :            :      * Triggers a new request to the GeoNode server, with the requested \a endPoint.
     116                 :            :      * Any existing request will be aborted.
     117                 :            :      *
     118                 :            :      * Calling this method does not block while waiting for a result.
     119                 :            :      *
     120                 :            :      * \warning When using the non-blocking methods in this class, sending
     121                 :            :      * overlapping requests results in undefined behavior. Use separate instances
     122                 :            :      * of QgsGeoNodeRequest instead to avoid this.
     123                 :            :      *
     124                 :            :      * \see requestBlocking()
     125                 :            :      */
     126                 :            :     void request( const QString &endPoint );
     127                 :            : 
     128                 :            :     /**
     129                 :            :      * Triggers a new request to the GeoNode server, with the requested \a endPoint.
     130                 :            :      * Any existing request will be aborted.
     131                 :            :      *
     132                 :            :      * Calling this method will block while waiting for a result. It should not be
     133                 :            :      * used from any code which potentially blocks operation in the main GUI thread.
     134                 :            :      *
     135                 :            :      * \see request()
     136                 :            :      */
     137                 :            :     bool requestBlocking( const QString &endPoint );
     138                 :            : 
     139                 :            :     /**
     140                 :            :      * Triggers a new request to fetch the list of available layers from the
     141                 :            :      * server. When complete, the layersFetched() signal will be emitted
     142                 :            :      * with the result.
     143                 :            :      *
     144                 :            :      * This method is non-blocking and returns immediately.
     145                 :            :      *
     146                 :            :      * \warning When using the non-blocking methods in this class, sending
     147                 :            :      * overlapping requests results in undefined behavior. Use separate instances
     148                 :            :      * of QgsGeoNodeRequest instead to avoid this.
     149                 :            :      *
     150                 :            :      * \see layersFetched()
     151                 :            :      * \see fetchLayersBlocking()
     152                 :            :      */
     153                 :            :     void fetchLayers();
     154                 :            : 
     155                 :            :     /**
     156                 :            :      * Requests the list of available layers from the server.
     157                 :            :      *
     158                 :            :      * This method is blocking and will wait for results from the server before returning.
     159                 :            :      * Accordingly it should not be used from any code which potentially blocks operation in the main GUI thread.
     160                 :            :      *
     161                 :            :      * \see fetchLayers()
     162                 :            :      */
     163                 :            :     QList<QgsGeoNodeRequest::ServiceLayerDetail> fetchLayersBlocking();
     164                 :            : 
     165                 :            :     /**
     166                 :            :      * Requests the list of available styles for the layer
     167                 :            :      * with matching \a layerName from the server.
     168                 :            :      *
     169                 :            :      * This method is blocking and will wait for results from the server before returning.
     170                 :            :      * Accordingly it should not be used from any code which potentially blocks operation in the main GUI thread.
     171                 :            :      *
     172                 :            :      */
     173                 :            :     QList<QgsGeoNodeStyle> fetchStylesBlocking( const QString &layerName );
     174                 :            : 
     175                 :            :     /**
     176                 :            :      * Requests the default style for the layer with matching \a layerName from the server.
     177                 :            :      *
     178                 :            :      * This method is blocking and will wait for results from the server before returning.
     179                 :            :      * Accordingly it should not be used from any code which potentially blocks operation in the main GUI thread.
     180                 :            :      */
     181                 :            :     QgsGeoNodeStyle fetchDefaultStyleBlocking( const QString &layerName );
     182                 :            : 
     183                 :            :     /**
     184                 :            :      * Requests the details for the style with matching \a styleId from the server.
     185                 :            :      *
     186                 :            :      * This method is blocking and will wait for results from the server before returning.
     187                 :            :      * Accordingly it should not be used from any code which potentially blocks operation in the main GUI thread.
     188                 :            :      */
     189                 :            :     QgsGeoNodeStyle fetchStyleBlocking( const QString &styleId );
     190                 :            : 
     191                 :            :     /**
     192                 :            :      * Requests the list of unique URLs for available services with matching \a serviceType from the server.
     193                 :            :      *
     194                 :            :      * This method is blocking and will wait for results from the server before returning.
     195                 :            :      * Accordingly it should not be used from any code which potentially blocks operation in the main GUI thread.
     196                 :            :      */
     197                 :            :     QStringList fetchServiceUrlsBlocking( const QString &serviceType );
     198                 :            : 
     199                 :            :     /**
     200                 :            :      * Obtains a map of layer name to URL for available services with matching \a serviceType from the server.
     201                 :            :      *
     202                 :            :      * This method is blocking and will wait for results from the server before returning.
     203                 :            :      * Accordingly it should not be used from any code which potentially blocks operation in the main GUI thread.
     204                 :            :      */
     205                 :            :     QgsStringMap fetchServiceUrlDataBlocking( const QString &serviceType );
     206                 :            : 
     207                 :            :     /**
     208                 :            :      * Returns the most recent error string for any encountered errors, or an empty string if
     209                 :            :      * no errors have been encountered.
     210                 :            :      */
     211                 :            :     QString lastError() const { return mError; }
     212                 :            : 
     213                 :            :     /**
     214                 :            :      * Returns the most recent response obtained from the server.
     215                 :            :      */
     216                 :          0 :     QByteArray lastResponse() const { return mHttpGeoNodeResponse; }
     217                 :            : 
     218                 :            :     /**
     219                 :            :      * Returns the network protocol (e.g. 'http') used for connecting with the server.
     220                 :            :      * \see setProtocol()
     221                 :            :      */
     222                 :            :     QString protocol() const;
     223                 :            : 
     224                 :            :     /**
     225                 :            :      * Sets the network \a protocol (e.g. 'http') used for connecting with the server.
     226                 :            :      * \see protocol()
     227                 :            :      */
     228                 :            :     void setProtocol( const QString &protocol );
     229                 :            : 
     230                 :            :     /**
     231                 :            :      * Returns the updated ServiceLayerDetail struct with WMS/WFS/XYZ url.
     232                 :            :      */
     233                 :            :     QgsGeoNodeRequest::ServiceLayerDetail parseOwsUrl( QgsGeoNodeRequest::ServiceLayerDetail &layerStruct, const QVariantList &layerLinks );
     234                 :            : 
     235                 :            :   public slots:
     236                 :            : 
     237                 :            :     /**
     238                 :            :      * Aborts any active network request immediately.
     239                 :            :      */
     240                 :            :     void abort();
     241                 :            : 
     242                 :            :   signals:
     243                 :            : 
     244                 :            :     /**
     245                 :            :      * Emitted when the status of an ongoing request is changed.
     246                 :            :      */
     247                 :            :     void statusChanged( const QString &statusQString );
     248                 :            : 
     249                 :            :     /**
     250                 :            :      * Emitted when the existing request has been completed.
     251                 :            :      */
     252                 :            :     void requestFinished();
     253                 :            : 
     254                 :            :     /**
     255                 :            :      * Emitted when the result of a fetchLayers call has been received and processed.
     256                 :            :      */
     257                 :            :     void layersFetched( const QList<QgsGeoNodeRequest::ServiceLayerDetail> &layers );
     258                 :            : 
     259                 :            :   private slots:
     260                 :            :     void replyFinished();
     261                 :            :     void replyProgress( qint64, qint64 );
     262                 :            : 
     263                 :            :   private:
     264                 :            : 
     265                 :            :     //! URL part of URI (httpuri)
     266                 :            :     QString mProtocol;
     267                 :            : 
     268                 :            :     //! URL part of URI (httpuri)
     269                 :            :     QString mBaseUrl;
     270                 :            : 
     271                 :            :     //! The reply to the geonode request
     272                 :            :     QNetworkReply *mGeoNodeReply = nullptr;
     273                 :            : 
     274                 :            :     //! The error message associated with the last error.
     275                 :            :     QString mError;
     276                 :            : 
     277                 :            :     //! The mime type of the message
     278                 :            :     QString mErrorFormat;
     279                 :            : 
     280                 :            :     //! Response
     281                 :            :     QByteArray mHttpGeoNodeResponse;
     282                 :            : 
     283                 :            :     bool mIsAborted = false;
     284                 :            :     bool mForceRefresh = false;
     285                 :            : 
     286                 :            :     QList<QgsGeoNodeRequest::ServiceLayerDetail> parseLayers( const QByteArray &layerResponse );
     287                 :            :     QgsGeoNodeStyle retrieveStyle( const QString &styleUrl );
     288                 :            : 
     289                 :            :     QNetworkReply *requestUrl( const QString &url );
     290                 :            : 
     291                 :            : };
     292                 :            : 
     293                 :            : #endif // QGSGEONODEREQUEST_H

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