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
|
// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "downloadmanager.h"
#include <QTextStream>
#include <cstdio>
using namespace std;
DownloadManager::DownloadManager(QObject *parent)
: QObject(parent)
{
}
void DownloadManager::append(const QStringList &urls)
{
for (const QString &urlAsString : urls)
append(QUrl::fromEncoded(urlAsString.toLocal8Bit()));
if (downloadQueue.isEmpty())
QTimer::singleShot(0, this, &DownloadManager::finished);
}
void DownloadManager::append(const QUrl &url)
{
if (downloadQueue.isEmpty())
QTimer::singleShot(0, this, &DownloadManager::startNextDownload);
downloadQueue.enqueue(url);
++totalCount;
}
QString DownloadManager::saveFileName(const QUrl &url)
{
QString path = url.path();
QString basename = QFileInfo(path).fileName();
if (basename.isEmpty())
basename = "download";
if (QFile::exists(basename)) {
// already exists, don't overwrite
int i = 0;
basename += '.';
while (QFile::exists(basename + QString::number(i)))
++i;
basename += QString::number(i);
}
return basename;
}
void DownloadManager::startNextDownload()
{
if (downloadQueue.isEmpty()) {
printf("%d/%d files downloaded successfully\n", downloadedCount, totalCount);
emit finished();
return;
}
QUrl url = downloadQueue.dequeue();
QString filename = saveFileName(url);
output.setFileName(filename);
if (!output.open(QIODevice::WriteOnly)) {
fprintf(stderr, "Problem opening save file '%s' for download '%s': %s\n",
qPrintable(filename), url.toEncoded().constData(),
qPrintable(output.errorString()));
startNextDownload();
return; // skip this download
}
QNetworkRequest request(url);
currentDownload = manager.get(request);
connect(currentDownload, &QNetworkReply::downloadProgress,
this, &DownloadManager::downloadProgress);
connect(currentDownload, &QNetworkReply::finished,
this, &DownloadManager::downloadFinished);
connect(currentDownload, &QNetworkReply::readyRead,
this, &DownloadManager::downloadReadyRead);
// prepare the output
printf("Downloading %s...\n", url.toEncoded().constData());
downloadTimer.start();
}
void DownloadManager::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
progressBar.setStatus(bytesReceived, bytesTotal);
// calculate the download speed
double speed = bytesReceived * 1000.0 / downloadTimer.elapsed();
QString unit;
if (speed < 1024) {
unit = "bytes/sec";
} else if (speed < 1024*1024) {
speed /= 1024;
unit = "kB/s";
} else {
speed /= 1024*1024;
unit = "MB/s";
}
progressBar.setMessage(QString::fromLatin1("%1 %2")
.arg(speed, 3, 'f', 1).arg(unit));
progressBar.update();
}
void DownloadManager::downloadFinished()
{
progressBar.clear();
output.close();
if (currentDownload->error()) {
// download failed
fprintf(stderr, "Failed: %s\n", qPrintable(currentDownload->errorString()));
output.remove();
} else {
// let's check if it was actually a redirect
if (isHttpRedirect()) {
reportRedirect();
output.remove();
} else {
printf("Succeeded.\n");
++downloadedCount;
}
}
currentDownload->deleteLater();
startNextDownload();
}
void DownloadManager::downloadReadyRead()
{
output.write(currentDownload->readAll());
}
bool DownloadManager::isHttpRedirect() const
{
int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
return statusCode == 301 || statusCode == 302 || statusCode == 303
|| statusCode == 305 || statusCode == 307 || statusCode == 308;
}
void DownloadManager::reportRedirect()
{
int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
QUrl requestUrl = currentDownload->request().url();
QTextStream(stderr) << "Request: " << requestUrl.toDisplayString()
<< " was redirected with code: " << statusCode
<< '\n';
QVariant target = currentDownload->attribute(QNetworkRequest::RedirectionTargetAttribute);
if (!target.isValid())
return;
QUrl redirectUrl = target.toUrl();
if (redirectUrl.isRelative())
redirectUrl = requestUrl.resolved(redirectUrl);
QTextStream(stderr) << "Redirected to: " << redirectUrl.toDisplayString()
<< '\n';
}
|
