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 to_xml_node
  76     el1 = XML::Node.new 'gpx_file'
  77     el1['id'] = self.id.to_s
  78     el1['name'] = self.name.to_s
  79     el1['lat'] = self.latitude.to_s
  80     el1['lon'] = self.longitude.to_s
  81     el1['user'] = self.user.display_name
  82     el1['public'] = self.public.to_s
  83     el1['pending'] = (!self.inserted).to_s
  84     el1['timestamp'] = self.timestamp.xmlschema
  85     return el1
  86   end
  87
  88   def import
  89     begin
  90       logger.info("GPX Import importing #{name} (#{id}) from #{user.email}")
  91
  92       # TODO *nix specific, could do to work on windows... would be functionally inferior though - check for '.gz'
  93       filetype = `file -b #{trace_name}`.chomp
  94       gzipped = filetype =~ /^gzip/
  95       bzipped = filetype =~ /^bzip2/
  96       zipped = filetype =~ /^Zip/
  97
  98       if gzipped
  99         filename = tempfile = "/tmp/#{rand}"
 100         system("gunzip -c #{trace_name} > #{filename}")
 101       elsif bzipped
 102         filename = tempfile = "/tmp/#{rand}"
 103         system("bunzip2 -c #{trace_name} > #{filename}")
 104       elsif zipped
 105         filename = tempfile = "/tmp/#{rand}"
 106         system("unzip -p #{trace_name} > #{filename}")
 107       else
 108         filename = trace_name
 109       end
 110
 111       gpx = OSM::GPXImporter.new(filename)
 112
 113       f_lat = 0
 114       f_lon = 0
 115       first = true
 116
 117       Tracepoint.delete_all(['gpx_id = ?', self.id])
 118
 119       gpx.points do |point|
 120         if first
 121           f_lat = point['latitude']
 122           f_lon = point['longitude']
 123         end
 124
 125         tp = Tracepoint.new
 126         tp.lat = point['latitude'].to_f
 127         tp.lng = point['longitude'].to_f
 128         tp.altitude = point['altitude'].to_f
 129         tp.timestamp = point['timestamp']
 130         tp.user_id = user.id
 131         tp.gpx_id = id
 132         tp.trackid = point['segment'].to_i
 133         tp.save!
 134       end
 135
 136       if gpx.actual_points > 0
 137         max_lat = Tracepoint.maximum('latitude', :conditions => ['gpx_id = ?', id])
 138         min_lat = Tracepoint.minimum('latitude', :conditions => ['gpx_id = ?', id])
 139         max_lon = Tracepoint.maximum('longitude', :conditions => ['gpx_id = ?', id])
 140         min_lon = Tracepoint.minimum('longitude', :conditions => ['gpx_id = ?', id])
 141
 142         max_lat = max_lat.to_f / 1000000
 143         min_lat = min_lat.to_f / 1000000
 144         max_lon = max_lon.to_f / 1000000
 145         min_lon = min_lon.to_f / 1000000
 146
 147         self.latitude = f_lat
 148         self.longitude = f_lon
 149         self.large_picture = gpx.get_picture(min_lat, min_lon, max_lat, max_lon, gpx.actual_points)
 150         self.icon_picture = gpx.get_icon(min_lat, min_lon, max_lat, max_lon)
 151         self.size = gpx.actual_points
 152         self.inserted = true
 153         self.save
 154       end
 155
 156       logger.info "done trace #{id}"
 157
 158       return gpx
 159     ensure
 160       FileUtils.rm_f(tempfile) if tempfile
 161     end
 162   end
 163 end