← Back to branch summary

~dobey/ubuntu/natty/banshee/fix-and-amz

« back to all changes in this revision

Viewing changes to src/Libraries/Lastfm/Lastfm.Data/LastfmData.cs

  • Committer: Bazaar Package Importer
  • Author(s): Sebastian Dröge
  • Date: 2008-07-30 12:37:28 UTC
  • mto: (1.2.3 upstream) (94.1.1 maverick)
  • mto: This revision was merged to the branch mainline in revision 70.
  • Revision ID: james.westby@ubuntu.com-20080730123728-8y78ip4btz99ri5h
Tags: upstream-1.2.0
Import upstream version 1.2.0

Show diffs side-by-side

added added

removed removed

Lines of Context:
src/Libraries/Lastfm/Lastfm.Data/LastfmData.cs
2
2
// LastfmData.cs
3
3
//
4
4
// Authors:
5
 
//   Gabriel Burt <gburt@novell.com>
 
5
//   Gabriel Burt
 
6
//   Fredrik Hedberg
 
7
//   Aaron Bockover
 
8
//   Lukas Lipka
6
9
//
7
10
// Copyright (C) 2008 Novell, Inc.
8
11
//
48
51
 
49
52
    public class LastfmData<T> : IEnumerable<T> where T : DataEntry
50
53
    {
51
 
        protected DataEntryCollection<T> collection;
 
54
        private static DataEntryCollection<T> empty_collection = new DataEntryCollection<T> ((XmlNodeList)null);
 
55
        protected DataEntryCollection<T> collection = empty_collection;
52
56
        protected XmlDocument doc;
53
57
        protected string data_url;
54
58
        protected string cache_file;
71
75
        {
72
76
            DataCore.Initialize ();
73
77
 
74
 
            this.data_url = HostInjectionHack (String.Format ("http://ws.audioscrobbler.com/1.0/{0}", dataUrlFragment));
75
 
            this.cache_file = GetCachedPathFromUrl (data_url);
 
78
            this.data_url = DataCore.FixLastfmUrl (String.Format ("http://ws.audioscrobbler.com/1.0/{0}", dataUrlFragment));
 
79
            this.cache_file = DataCore.GetCachedPathFromUrl (data_url);
76
80
            this.cache_duration = cacheDuration;
77
81
            this.xpath = xpath;
78
82
 
90
94
        private void GetData ()
91
95
        {
92
96
            // Download the content if necessary
93
 
            DownloadContent ();
 
97
            DataCore.DownloadContent (data_url, cache_file, cache_duration);
94
98
 
95
99
            // Load the XML from the new or cached local file
96
100
            doc = new XmlDocument ();
133
137
 
134
138
#region Private methods
135
139
 
136
 
        private void DownloadContent ()
137
 
        {
138
 
            // See if we have a valid cached copy
139
 
            if (cache_duration != CacheDuration.None) {
140
 
                if (File.Exists (cache_file)) {
141
 
                    DateTime last_updated_time = File.GetLastWriteTime (cache_file);
142
 
                    if (cache_duration == CacheDuration.Infinite || DateTime.Now - last_updated_time < DataCore.NormalCacheTime) {
143
 
                        return;
144
 
                    }
145
 
                }
146
 
            }
147
 
 
148
 
            HttpWebRequest request = (HttpWebRequest) WebRequest.Create (data_url);
149
 
            request.UserAgent = DataCore.UserAgent;
150
 
            request.KeepAlive = false;
151
 
            
152
 
            using (HttpWebResponse response = (HttpWebResponse) request.GetResponse ()) {
153
 
                using (Stream stream = GetResponseStream (response)) {
154
 
                    using (FileStream file_stream = File.Open (cache_file, FileMode.Create)) {
155
 
                        using (BufferedStream buffered_stream = new BufferedStream (file_stream)) {
156
 
                            byte [] buffer = new byte[8192];
157
 
                            int read;
158
 
                            
159
 
                            while (true) {
160
 
                                read = stream.Read (buffer, 0, buffer.Length);
161
 
                                if (read <= 0) {
162
 
                                    break;
163
 
                                }
164
 
                                
165
 
                                buffered_stream.Write (buffer, 0, read);
166
 
                            }
167
 
                        }
168
 
                    }
169
 
                }
170
 
            }
171
 
        }
172
 
 
173
 
        private static Stream GetResponseStream (HttpWebResponse response) 
174
 
        {
175
 
            return response.ContentEncoding == "gzip"
176
 
                ? new GZipInputStream (response.GetResponseStream ())
177
 
                : response.GetResponseStream ();
178
 
        }
179
 
 
180
 
    
181
 
        private static string GetCachedPathFromUrl (string url)
182
 
        {
183
 
            string hash = url.GetHashCode ().ToString ("X").ToLower ();
184
 
            return Path.Combine (Path.Combine (DataCore.CachePath, hash.Substring (0, 2)), hash);
185
 
        }
186
 
 
187
 
        // FIXME: This is to (try to) work around a bug in last.fm's XML
188
 
        // Some XML nodes with URIs as content do not return a URI with a
189
 
        // host name. It appears that in these cases the hostname is to be
190
 
        // static3.last.fm, but it may not always be the case - this is
191
 
        // a bug in last.fm, but we attempt to work around it here
192
 
        // http://bugzilla.gnome.org/show_bug.cgi?id=408068
193
 
 
194
 
        private static string HostInjectionHack (string url)
195
 
        {
196
 
            if (url.StartsWith ("http:///storable/")) {
197
 
                url = url.Insert (7, "static3.last.fm");
198
 
            }
199
 
 
200
 
            return url;
201
 
        }
202
 
 
203
140
#endregion
204
141
 
205
142
    }