1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QNETWORKACCESSBACKEND_P_H
#define QNETWORKACCESSBACKEND_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of the Network Access API. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include "qnetworkreplyimpl_p.h"
#include "QtCore/qobject.h"
QT_BEGIN_NAMESPACE
class QAuthenticator;
class QNetworkProxy;
class QNetworkProxyQuery;
class QNetworkRequest;
class QUrl;
class QUrlInfo;
class QSslConfiguration;
class QNetworkAccessManagerPrivate;
class QNetworkReplyImplPrivate;
class QAbstractNetworkCache;
class QNetworkCacheMetaData;
class QNonContiguousByteDevice;
// Should support direct file upload from disk or download to disk.
//
// - The HTTP handler will use two QIODevices for communication (pull mechanism)
// - KIO uses a pull mechanism too (data/dataReq signals)
class QNetworkAccessBackend : public QObject
{
Q_OBJECT
public:
QNetworkAccessBackend();
virtual ~QNetworkAccessBackend();
// To avoid mistaking with QIODevice names, the functions here
// have different names. The Connection has two streams:
//
// - Upstream:
// The upstream uses a QNonContiguousByteDevice provided
// by the backend. This device emits the usual readyRead()
// signal when the backend has data available for the connection
// to write. The different backends can listen on this signal
// and then pull upload data from the QNonContiguousByteDevice and
// deal with it.
//
//
// - Downstream:
// Downstream is the data that is being read from this
// connection and is given to the user. Downstream operates in a
// semi-"push" mechanism: the Connection object pushes the data
// it gets from the network, but it should avoid writing too
// much if the data isn't being used fast enough. The value
// returned by suggestedDownstreamBlockSize() can be used to
// determine how much should be written at a time. The
// downstreamBytesConsumed() function will be called when the
// downstream buffer is consumed by the user -- the Connection
// may choose to re-fill it with more data it has ready or get
// more data from the network (for instance, by reading from its
// socket).
virtual void open() = 0;
virtual bool start();
virtual void closeDownstreamChannel() = 0;
// slot-like:
virtual void downstreamReadyWrite();
virtual void setDownstreamLimited(bool b);
virtual void setReadBufferSize(qint64 size);
virtual void emitReadBufferFreed(qint64 size);
virtual void copyFinished(QIODevice *);
virtual void ignoreSslErrors();
virtual void ignoreSslErrors(const QList<QSslError> &errors);
virtual void fetchSslConfiguration(QSslConfiguration &configuration) const;
virtual void setSslConfiguration(const QSslConfiguration &configuration);
virtual QNetworkCacheMetaData fetchCacheMetaData(const QNetworkCacheMetaData &metaData) const;
// information about the request
QNetworkAccessManager::Operation operation() const;
QNetworkRequest request() const;
#ifndef QT_NO_NETWORKPROXY
QList<QNetworkProxy> proxyList() const;
#endif
QAbstractNetworkCache *networkCache() const;
void setCachingEnabled(bool enable);
bool isCachingEnabled() const;
// information about the reply
QUrl url() const;
void setUrl(const QUrl &url);
// "cooked" headers
QVariant header(QNetworkRequest::KnownHeaders header) const;
void setHeader(QNetworkRequest::KnownHeaders header, const QVariant &value);
// raw headers:
bool hasRawHeader(const QByteArray &headerName) const;
QList<QByteArray> rawHeaderList() const;
QByteArray rawHeader(const QByteArray &headerName) const;
void setRawHeader(const QByteArray &headerName, const QByteArray &value);
// attributes:
QVariant attribute(QNetworkRequest::Attribute code) const;
void setAttribute(QNetworkRequest::Attribute code, const QVariant &value);
bool isSynchronous() { return synchronous; }
void setSynchronous(bool sync) { synchronous = sync; }
// return true if the QNonContiguousByteDevice of the upload
// data needs to support reset(). Currently needed for HTTP.
// This will possibly enable buffering of the upload data.
virtual bool needsResetableUploadData() { return false; }
// Returns true if backend is able to resume downloads.
virtual bool canResume() const { return false; }
virtual void setResumeOffset(quint64 offset) { Q_UNUSED(offset); }
virtual bool processRequestSynchronously() { return false; }
protected:
// Create the device used for reading the upload data
QNonContiguousByteDevice* createUploadByteDevice();
// these functions control the downstream mechanism
// that is, data that has come via the connection and is going out the backend
qint64 nextDownstreamBlockSize() const;
void writeDownstreamData(QByteDataBuffer &list);
// not actually appending data, it was already written to the user buffer
void writeDownstreamDataDownloadBuffer(qint64, qint64);
char* getDownloadBuffer(qint64);
QSharedPointer<QNonContiguousByteDevice> uploadByteDevice;
public slots:
// for task 251801, needs to be a slot to be called asynchronously
void writeDownstreamData(QIODevice *data);
protected slots:
void finished();
void error(QNetworkReply::NetworkError code, const QString &errorString);
#ifndef QT_NO_NETWORKPROXY
void proxyAuthenticationRequired(const QNetworkProxy &proxy, QAuthenticator *auth);
#endif
void authenticationRequired(QAuthenticator *auth);
void metaDataChanged();
void redirectionRequested(const QUrl &destination);
void sslErrors(const QList<QSslError> &errors);
void emitReplyUploadProgress(qint64 bytesSent, qint64 bytesTotal);
protected:
// FIXME In the long run we should get rid of our QNAM architecture
// and scrap this ReplyImpl/Backend distinction.
QNetworkAccessManagerPrivate *manager;
QNetworkReplyImplPrivate *reply;
private:
friend class QNetworkAccessManager;
friend class QNetworkAccessManagerPrivate;
friend class QNetworkReplyImplPrivate;
bool synchronous;
};
class QNetworkAccessBackendFactory
{
public:
QNetworkAccessBackendFactory();
virtual ~QNetworkAccessBackendFactory();
virtual QNetworkAccessBackend *create(QNetworkAccessManager::Operation op,
const QNetworkRequest &request) const = 0;
};
QT_END_NAMESPACE
#endif
|
