app/models/trace.rb

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