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, icon_picture_name, large_picture_name)
  16   end
  17
  18   def tagstring
  19     return tags.collect {|tt| tt.tag}.join(" ")
  20   end
  21
  22   def tagstring=(s)
  23     self.tags = s.split().collect {|tag|
  24       tt = Tracetag.new
  25       tt.tag = tag
  26       tt
  27     }
  28   end
  29
  30   def large_picture= (data)
  31     f = File.new(large_picture_name, "wb")
  32     f.syswrite(data)
  33     f.close
  34   end
  35
  36   def icon_picture= (data)
  37     f = File.new(icon_picture_name, "wb")
  38     f.syswrite(data)
  39     f.close
  40   end
  41
  42   def large_picture
  43     f = File.new(large_picture_name, "rb")
  44     logger.info "large picture file: '#{f.path}', bytes: #{File.size(f.path)}"
  45     data = f.sysread(File.size(f.path))
  46     logger.info "have read data, bytes: '#{data.length}'"
  47     f.close
  48     data
  49   end
  50
  51   def icon_picture
  52     f = File.new(icon_picture_name, "rb")
  53     logger.info "icon picture file: '#{f.path}'"
  54     data = f.sysread(File.size(f.path))
  55     f.close
  56     data
  57   end
  58
  59   # FIXME change to permanent filestore area
  60   def large_picture_name
  61     "/home/osm/icons/#{id}.gif"
  62   end
  63
  64   # FIXME change to permanent filestore area
  65   def icon_picture_name
  66     "/home/osm/icons/#{id}_icon.gif"
  67   end
  68
  69   def trace_name
  70     "/home/osm/gpx/#{id}.gpx"
  71   end
  72
  73   def to_xml_node
  74     el1 = XML::Node.new 'gpx_file'
  75     el1['id'] = self.id.to_s
  76     el1['name'] = self.name.to_s
  77     el1['lat'] = self.latitude.to_s
  78     el1['lon'] = self.longitude.to_s
  79     el1['user'] = self.user.display_name
  80     el1['public'] = self.public.to_s
  81     el1['pending'] = (!self.inserted).to_s
  82     el1['timestamp'] = self.timestamp.xmlschema
  83     return el1
  84   end
  85
  86   def import
  87     begin
  88       logger.info("GPX Import importing #{name} (#{id}) from #{user.email}")
  89
  90       # TODO *nix specific, could do to work on windows... would be functionally inferior though - check for '.gz'
  91       filetype = `file -b #{trace_name}`.chomp
  92       gzipped = filetype =~ /^gzip/
  93       zipped = filetype =~ /^Zip/
  94
  95       if gzipped
  96         filename = tempfile = "/tmp/#{rand}"
  97         system("gunzip -c #{trace_name} > #{filename}")
  98       elsif zipped
  99         filename = tempfile = "/tmp/#{rand}"
 100         system("unzip -p #{trace_name} > #{filename}")
 101       else
 102         filename = trace_name
 103       end
 104
 105       gpx = OSM::GPXImporter.new(filename)
 106
 107       f_lat = 0
 108       f_lon = 0
 109       first = true
 110
 111       Tracepoint.delete_all(['gpx_id = ?', self.id])
 112
 113       gpx.points do |point|
 114         if first
 115           f_lat = point['latitude']
 116           f_lon = point['longitude']
 117         end
 118
 119         tp = Tracepoint.new
 120         tp.lat = point['latitude'].to_f
 121         tp.lng = point['longitude'].to_f
 122         tp.altitude = point['altitude'].to_f
 123         tp.timestamp = point['timestamp']
 124         tp.user_id = user.id
 125         tp.gpx_id = id
 126         tp.trackid = point['segment'].to_i
 127         tp.save!
 128       end
 129
 130       if gpx.actual_points > 0
 131         max_lat = Tracepoint.maximum('latitude', :conditions => ['gpx_id = ?', id])
 132         min_lat = Tracepoint.minimum('latitude', :conditions => ['gpx_id = ?', id])
 133         max_lon = Tracepoint.maximum('longitude', :conditions => ['gpx_id = ?', id])
 134         min_lon = Tracepoint.minimum('longitude', :conditions => ['gpx_id = ?', id])
 135
 136         max_lat = max_lat.to_f / 1000000
 137         min_lat = min_lat.to_f / 1000000
 138         max_lon = max_lon.to_f / 1000000
 139         min_lon = min_lon.to_f / 1000000
 140
 141         self.latitude = f_lat
 142         self.longitude = f_lon
 143         self.large_picture = gpx.get_picture(min_lat, min_lon, max_lat, max_lon, gpx.actual_points)
 144         self.icon_picture = gpx.get_icon(min_lat, min_lon, max_lat, max_lon)
 145         self.size = gpx.actual_points
 146         self.inserted = true
 147         self.save
 148       end
 149
 150       logger.info "done trace #{id}"
 151
 152       return gpx
 153     ensure
 154       FileUtils.rm_f(tempfile) if tempfile
 155     end
 156   end
 157 end