Avoid reading traces and trace images into memory when sending them to
[rails.git] / app / models / trace.rb
1 class Trace < ActiveRecord::Base
2   set_table_name 'gpx_files'
3
4   validates_presence_of :user_id, :name, :timestamp
5   validates_presence_of :description, :on => :create
6 #  validates_numericality_of :latitude, :longitude
7   validates_inclusion_of :public, :inserted, :in => [ true, false]
8   
9   belongs_to :user
10   has_many :tags, :class_name => 'Tracetag', :foreign_key => 'gpx_id', :dependent => :delete_all
11   has_many :points, :class_name => 'Tracepoint', :foreign_key => 'gpx_id', :dependent => :delete_all
12
13   def destroy
14     super
15     FileUtils.rm_f(trace_name)
16     FileUtils.rm_f(icon_picture_name)
17     FileUtils.rm_f(large_picture_name)
18   end
19
20   def tagstring
21     return tags.collect {|tt| tt.tag}.join(" ")
22   end
23
24   def tagstring=(s)
25     self.tags = s.split().collect {|tag|
26       tt = Tracetag.new
27       tt.tag = tag
28       tt
29     }
30   end
31   
32   def large_picture= (data)
33     f = File.new(large_picture_name, "wb")
34     f.syswrite(data)
35     f.close
36   end
37   
38   def icon_picture= (data)
39     f = File.new(icon_picture_name, "wb")
40     f.syswrite(data)
41     f.close
42   end
43
44   def large_picture
45     f = File.new(large_picture_name, "rb")
46     logger.info "large picture file: '#{f.path}', bytes: #{File.size(f.path)}"
47     data = f.sysread(File.size(f.path))
48     logger.info "have read data, bytes: '#{data.length}'"
49     f.close
50     data
51   end
52   
53   def icon_picture
54     f = File.new(icon_picture_name, "rb")
55     logger.info "icon picture file: '#{f.path}'"
56     data = f.sysread(File.size(f.path))
57     f.close
58     data
59   end
60   
61   # FIXME change to permanent filestore area
62   def large_picture_name
63     "/home/osm/icons/#{id}.gif"
64   end
65
66   # FIXME change to permanent filestore area
67   def icon_picture_name
68     "/home/osm/icons/#{id}_icon.gif"
69   end
70
71   def trace_name
72     "/home/osm/gpx/#{id}.gpx"
73   end
74
75   def mime_type
76     return `file -bi #{trace_name}`.chomp
77   end
78
79   def to_xml_node
80     el1 = XML::Node.new 'gpx_file'
81     el1['id'] = self.id.to_s
82     el1['name'] = self.name.to_s
83     el1['lat'] = self.latitude.to_s
84     el1['lon'] = self.longitude.to_s
85     el1['user'] = self.user.display_name
86     el1['public'] = self.public.to_s
87     el1['pending'] = (!self.inserted).to_s
88     el1['timestamp'] = self.timestamp.xmlschema
89     return el1
90   end
91
92   def import
93     begin
94       logger.info("GPX Import importing #{name} (#{id}) from #{user.email}")
95
96       # TODO *nix specific, could do to work on windows... would be functionally inferior though - check for '.gz'
97       filetype = `file -bz #{trace_name}`.chomp
98       gzipped = filetype =~ /gzip compressed/
99       bzipped = filetype =~ /bzip2 compressed/
100       zipped = filetype =~ /Zip archive/
101       tarred = filetype =~ /tar archive/
102
103       if tarred and gzipped then
104         filename = tempfile = "/tmp/#{rand}"
105         system("tar -zxOf #{trace_name} > #{filename}")
106       elsif tarred and bzipped then
107         filename = tempfile = "/tmp/#{rand}"
108         system("tar -jxOf #{trace_name} > #{filename}")
109       elsif tarred
110         filename = tempfile = "/tmp/#{rand}"
111         system("tar -xOf #{trace_name} > #{filename}")
112       elsif gzipped
113         filename = tempfile = "/tmp/#{rand}"
114         system("gunzip -c #{trace_name} > #{filename}")
115       elsif bzipped
116         filename = tempfile = "/tmp/#{rand}"
117         system("bunzip2 -c #{trace_name} > #{filename}")
118       elsif zipped
119         filename = tempfile = "/tmp/#{rand}"
120         system("unzip -p #{trace_name} > #{filename}")
121       else
122         filename = trace_name
123       end
124
125       gpx = OSM::GPXImporter.new(filename)
126
127       f_lat = 0
128       f_lon = 0
129       first = true
130
131       Tracepoint.delete_all(['gpx_id = ?', self.id])
132
133       gpx.points do |point|
134         if first
135           f_lat = point['latitude']
136           f_lon = point['longitude']
137         end
138
139         tp = Tracepoint.new
140         tp.lat = point['latitude'].to_f
141         tp.lng = point['longitude'].to_f
142         tp.altitude = point['altitude'].to_f
143         tp.timestamp = point['timestamp']
144         tp.user_id = user.id
145         tp.gpx_id = id
146         tp.trackid = point['segment'].to_i
147         tp.save!
148       end
149
150       if gpx.actual_points > 0
151         max_lat = Tracepoint.maximum('latitude', :conditions => ['gpx_id = ?', id])
152         min_lat = Tracepoint.minimum('latitude', :conditions => ['gpx_id = ?', id])
153         max_lon = Tracepoint.maximum('longitude', :conditions => ['gpx_id = ?', id])
154         min_lon = Tracepoint.minimum('longitude', :conditions => ['gpx_id = ?', id])
155
156         max_lat = max_lat.to_f / 1000000
157         min_lat = min_lat.to_f / 1000000
158         max_lon = max_lon.to_f / 1000000
159         min_lon = min_lon.to_f / 1000000
160
161         self.latitude = f_lat
162         self.longitude = f_lon
163         self.large_picture = gpx.get_picture(min_lat, min_lon, max_lat, max_lon, gpx.actual_points)
164         self.icon_picture = gpx.get_icon(min_lat, min_lon, max_lat, max_lon)
165         self.size = gpx.actual_points
166         self.inserted = true
167         self.save
168       end
169
170       logger.info "done trace #{id}"
171
172       return gpx
173     ensure
174       FileUtils.rm_f(tempfile) if tempfile
175     end
176   end
177 end