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annotate ui/downloader.h @ 214:aab742690bee

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Fix check for selected items and wait for bytes written. According to the documentation closing the write channel should suffice. But in testing it did not sent over everything.
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 26 Mar 2014 17:17:19 +0100
parents 09cd242d8443
children 17e1c8f37d72
rev   line source
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1 #ifndef DOWNLOADER_H
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2 #define DOWNLOADER_H
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3 /**
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4 * @file downloader.h
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5 * @brief High level API to download necessary data.
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6 *
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7 */
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8
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9 #include <QThread>
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10 #include <QDateTime>
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11 #include <QString>
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12 #include <QByteArray>
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13
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14 #include "sslconnection.h"
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16 class Downloader: public QThread
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17 {
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18 Q_OBJECT
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19
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20 public:
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21 /**
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22 * @brief Construct a downloader with a specific certificate
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23 *
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24 * The downloader will check the last-modified date of the
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25 * certificate list / sw on the server at the specified url
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26 * and download those accordingly. If newestSW or newestList is
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27 * are valid datetimes only files modified after the respective date
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28 * are downloaded.
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29 *
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30 * Downloaded files are placed in QStandardPaths::DataLocation
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31 *
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32 * @param[in] parent the parent object.
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33 * @param[in] url the Url to download data from
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34 * @param[in] certificate optional certificate to validate https connection
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35 * @param[in] newestSW datetime after which software should be downloaded
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36 * @param[in] newestList datetime after which the list should be downloaded
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37 * @param[in] resourceSW the path where the software is to be found
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38 * @param[in] resourceList the path where the list is to be found
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39 */
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40 Downloader(QObject* parent, const QString& url,
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41 const QByteArray& certificate = QByteArray(),
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42 const QDateTime& newestSW = QDateTime(),
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43 const QDateTime& newestList = QDateTime(),
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44 const QString& resourceSW = QString(),
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45 const QString& resourceList = QString());
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46
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47 ~Downloader();
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48
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49 /**
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50 * @brief get the directory where the downloader saves data
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51 *
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52 * If the directory does not exist this function ensures that it
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53 * is created.
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54 *
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55 * @returns The directory in which downloaded files are placed.
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56 **/
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57 QString getDataDirectory();
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58
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59 /**
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60 * @brief get the current error state
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61 *
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62 * @returns The current error state.
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63 **/
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64 SSLConnection::ErrorCode getErrorState();
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65
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66 protected:
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67 void run();
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68
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69 private:
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70 QDateTime mLastModSW;
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71 QDateTime mLastModList;
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72
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73 QString mResourceSW;
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74 QString mResourceList;
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75
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76 SSLConnection mSSLConnection;
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77
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78 /** @brief get the last modified header of a resource.
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79 *
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80 * Connection should be established beforehand.
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81 * Modifies the error state.
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82 *
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83 * @param[in] resource The resource to check
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84 *
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85 * @returns the last modified date or a null datetime in case of errors
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86 */
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87 QDateTime getLastModifiedHeader(const QString &resource);
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88
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89 /** @brief Download resource
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90 *
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91 * Download a resource with the established connection.
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92 * Modifies the error state.
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93 *
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94 * @param[in] resource the resource to download
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95 * @param[in] filename where the file should be saved.
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96 * @param[in] maxSize maximum amount of bytes to download
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97 *
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98 * @returns True if the download was successful.
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99 */
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100 bool downloadFile(const QString &resource, const QString &filename,
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101 size_t maxSize);
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102 /**
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103 * @brief parses the Headers of a repsonse.
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104 *
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105 * This removes the headers from the byte array passed as
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106 * parameter.
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107 *
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108 * @param[inout] data: The response to parse.
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109 *
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110 * @returns: A map of the header fields. Or an empty map on error.
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111 */
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112 QMap<QString, QString> parseHeaders(QByteArray *data);
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113
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114 Q_SIGNALS:
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115 /**
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116 * @brief software update is available
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117 */
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118 void newSoftwareAvailable(const QString &fileName,
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119 const QDateTime &lastMod);
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120
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121 /**
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122 * @brief new certificate list available
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123 */
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124 void newListAvailable(const QString &fileName, const QDateTime &lastMod);
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125
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126 /**
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127 * @brief Some progress has been made.
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128 *
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129 * @param[out] message: A message to show. Can be empty.
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130 * @param[out] current: Value of current progress.
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131 * @param[out] total: Total value of possible progress
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132 */
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133 void progress(const QString &message, int current, int total);
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134
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135 /**
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136 * @brief An error happened
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137 *
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138 * @param[out] message: A message to show. Can be empty.
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139 * @param[out] errorCode: ErrorCode of this error.
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140 */
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141 void error(const QString &message, SSLConnection::ErrorCode error);
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142 };
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143 #endif
http://wald.intevation.org/projects/trustbridge/