app/controllers/amf_controller.rb

   1 class AmfController < ApplicationController
   2   require 'stringio'
   3
   4   before_filter :check_availability
   5
   6   # to log:
   7   # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
   8
   9   # ====================================================================
  10   # Main AMF handler
  11
  12   # ---- talk   process AMF request
  13
  14   def talk
  15     req=StringIO.new(request.raw_post)  # Get POST data as request
  16     req.read(2)                                                 # Skip version indicator and client ID
  17     results={}                                                  # Results of each body
  18
  19     # -------------
  20     # Parse request
  21
  22     headers=getint(req)                                 # Read number of headers
  23
  24     headers.times do                                # Read each header
  25       name=getstring(req)                               #  |
  26       req.getc                                  #  | skip boolean
  27       value=getvalue(req)                               #  |
  28       header["name"]=value                              #  |
  29     end
  30
  31     bodies=getint(req)                                  # Read number of bodies
  32     bodies.times do                                     # Read each body
  33       message=getstring(req)                    #  | get message name
  34       index=getstring(req)                              #  | get index in response sequence
  35       bytes=getlong(req)                                #  | get total size in bytes
  36       args=getvalue(req)                                #  | get response (probably an array)
  37
  38       case message
  39                   when 'getpresets';    results[index]=putdata(index,getpresets)
  40                   when 'whichways';             results[index]=putdata(index,whichways(args))
  41                   when 'getway';                results[index]=putdata(index,getway(args))
  42                   when 'putway';                results[index]=putdata(index,putway(args))
  43                   when 'deleteway';             results[index]=putdata(index,deleteway(args))
  44                   when 'makeway';               results[index]=putdata(index,makeway(args))
  45       end
  46     end
  47
  48     # ------------------
  49     # Write out response
  50
  51     RAILS_DEFAULT_LOGGER.info("  Response: start")
  52     a,b=results.length.divmod(256)
  53         render :content_type => "application/x-amf", :text => proc { |response, output|
  54         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  55                 results.each do |k,v|
  56                   output.write(v)
  57                 end
  58         }
  59     RAILS_DEFAULT_LOGGER.info("  Response: end")
  60
  61   end
  62
  63   private
  64
  65   # ====================================================================
  66   # Remote calls
  67
  68   # ----- getpresets
  69   #           return presets,presetmenus and presetnames arrays
  70
  71   def getpresets
  72     presets={}
  73     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]
  74     presetnames={}; presetnames['point']={}; presetnames['way']={}
  75     presettype=''
  76     presetcategory=''
  77
  78     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
  79
  80     #           File.open("config/potlatch/presets.txt") do |file|
  81
  82     # Temporary patch to get around filepath problem
  83     # To remove this patch and make the code nice again:
  84     # 1. uncomment above line
  85     # 2. fix the path in the above line
  86     # 3. delete this here document, and the following line (StringIO....)
  87
  88     txt=<<-EOF
  89 way/road
  90 motorway: highway=motorway,ref=(type road number)
  91 trunk road: highway=trunk,ref=(type road number),name=(type road name)
  92 primary road: highway=primary,ref=(type road number),name=(type road name)
  93 secondary road: highway=secondary,ref=(type road number),name=(type road name)
  94 residential road: highway=residential,name=(type road name)
  95 unclassified road: highway=unclassified,name=(type road name)
  96
  97 way/footway
  98 footpath: highway=footway,foot=yes
  99 bridleway: highway=bridleway,foot=yes,horse=yes,bicycle=yes
 100 byway: highway=byway,foot=yes,horse=yes,bicycle=yes,motorcar=yes
 101 permissive path: highway=footway,foot=permissive
 102
 103 way/cycleway
 104 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 105 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 106 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 107 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 108
 109 way/waterway
 110 canal: waterway=canal,name=(type name here)
 111 navigable river: waterway=river,boat=yes,name=(type name here)
 112 navigable drain: waterway=drain,boat=yes,name=(type name here)
 113 derelict canal: waterway=derelict_canal,name=(type name here)
 114 unnavigable river: waterway=river,boat=no,name=(type name here)
 115 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 116
 117 way/railway
 118 railway: railway=rail
 119 tramway: railway=tram
 120 light railway: railway=light_rail
 121 preserved railway: railway=preserved
 122 disused railway tracks: railway=disused
 123 course of old railway: railway=abandoned
 124
 125 way/natural
 126 forest: natural=wood,landuse=forest
 127 woodland: natural=wood,landuse=
 128 reservoir: natural=water,landuse=reservoir
 129 lake: natural=water,landuse=
 130 marsh: natural=marsh
 131 beach: natural=beach
 132 coastline: natural=coastline
 133
 134 point/road
 135 mini roundabout: highway=mini_roundabout
 136 traffic lights: highway=traffic_signals
 137
 138 point/footway
 139 bridge: highway=bridge
 140 gate: highway=gate
 141 stile: highway=stile
 142 cattle grid: highway=cattle_grid
 143
 144 point/cycleway
 145 gate: highway=gate
 146
 147 point/waterway
 148 lock gate: waterway=lock_gate
 149 weir: waterway=weir
 150 aqueduct: waterway=aqueduct
 151 winding hole: waterway=turning_point
 152 mooring: waterway=mooring
 153
 154 point/railway
 155 station: railway=station
 156 viaduct: railway=viaduct
 157 level crossing: railway=crossing
 158
 159 point/natural
 160 peak: natural=peak
 161 EOF
 162
 163     StringIO.open(txt) do |file|
 164       file.each_line {|line|
 165         t=line.chomp
 166         if (t=~/(\w+)\/(\w+)/) then
 167           presettype=$1
 168           presetcategory=$2
 169           presetmenus[presettype].push(presetcategory)
 170           presetnames[presettype][presetcategory]=["(no preset)"]
 171         elsif (t=~/^(.+):\s?(.+)$/) then
 172           pre=$1; kv=$2
 173           presetnames[presettype][presetcategory].push(pre)
 174           presets[pre]={}
 175           kv.split(',').each {|a|
 176             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 177           }
 178         end
 179       }
 180     end
 181     return [presets,presetmenus,presetnames]
 182   end
 183
 184   # ----- whichways(left,bottom,right,top)
 185   #               return array of ways in current bounding box
 186   #               at present, instead of using correct (=more complex) SQL to find
 187   #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 188
 189   def whichways(args)
 190     xmin = args[0].to_f-0.01
 191     ymin = args[1].to_f-0.01
 192     xmax = args[2].to_f+0.01
 193     ymax = args[3].to_f+0.01
 194
 195     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 196
 197     waylist=WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+
 198        "  FROM current_way_segments,current_segments,current_nodes,current_ways "+
 199        " WHERE segment_id=current_segments.id "+
 200        "   AND current_segments.visible=1 "+
 201        "   AND node_a=current_nodes.id "+
 202            "   AND current_ways.id=current_way_segments.id "+
 203            "   AND current_ways.visible=1 "+
 204        "   AND (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 205        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+")")
 206
 207        ways = waylist.collect {|a| a.wayid.to_i } # get an array of way id's
 208
 209        pointlist =ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.tags "+
 210        "  FROM current_nodes "+
 211        "  LEFT OUTER JOIN current_segments cs1 ON cs1.node_a=current_nodes.id "+
 212        "  LEFT OUTER JOIN current_segments cs2 ON cs2.node_b=current_nodes.id "+
 213        " WHERE (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 214        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+") "+
 215        "   AND cs1.id IS NULL AND cs2.id IS NULL "+
 216        "   AND current_nodes.visible=1")
 217
 218             points = pointlist.collect {|a| [a['id'],tag2array(a['tags'])]      } # get a list of node ids and their tags
 219
 220     return [ways,points]
 221   end
 222
 223   # ----- getway (objectname, way, baselong, basey, masterscale)
 224   #               returns objectname, array of co-ordinates, attributes,
 225   #                               xmin,xmax,ymin,ymax
 226
 227   def getway(args)
 228     objname,wayid,baselong,basey,masterscale=args
 229     wayid = wayid.to_i
 230     points = []
 231     lastid = -1
 232     xmin = ymin = 999999
 233     xmax = ymax = -999999
 234
 235     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 236
 237     readwayquery(wayid).each {|row|
 238       xs1=long2coord(row['long1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 239       xs2=long2coord(row['long2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 240       points << [xs1,ys1,row['id1'].to_i,0,tag2array(row['tags1']),0] if (row['id1'].to_i!=lastid)
 241       lastid = row['id2'].to_i
 242       points << [xs2,ys2,row['id2'].to_i,1,tag2array(row['tags2']),row['segment_id'].to_i]
 243       xmin = [xmin,row['long1'].to_f,row['long2'].to_f].min
 244       xmax = [xmax,row['long1'].to_f,row['long2'].to_f].max
 245       ymin = [ymin,row['lat1'].to_f,row['lat2'].to_f].min
 246       ymax = [ymax,row['lat1'].to_f,row['lat2'].to_f].max
 247     }
 248
 249     attributes={}
 250     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 251     attrlist.each {|a| attributes[a['k']]=a['v'] }
 252
 253     [objname,points,attributes,xmin,xmax,ymin,ymax]
 254   end
 255
 256   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 257   #                                     baselong, basey, masterscale)
 258   #                     returns current way ID, new way ID, hash of renumbered nodes,
 259   #                                     xmin,xmax,ymin,ymax
 260
 261   def putway(args)
 262     usertoken,originalway,points,attributes,baselong,basey,masterscale=args
 263     uid=getuserid(usertoken)
 264     return if !uid
 265     db_uqs='uniq'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquesegments table name, typically 51 chars
 266     db_uqn='unin'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquenodes table name, typically 51 chars
 267     db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 268     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 269     originalway=originalway.to_i
 270
 271     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 272
 273     # -- 3.     read original way into memory
 274
 275     xc={}; yc={}; tagc={}; seg={}
 276     if originalway>0
 277       way=originalway
 278       readwayquery(way).each { |row|
 279         id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1']
 280         id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2']
 281         seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s
 282       }
 283           ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 284     else
 285       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 286     end
 287
 288     # -- 4.     get version by inserting new row into ways
 289
 290     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 291
 292     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 293
 294     xmin = ymin = 999999
 295     xmax = ymax = -999999
 296     insertsql = ''
 297     renumberednodes={}
 298
 299     points.each_index do |i|
 300       xs=coord2long(points[i][0],masterscale,baselong)
 301       ys=coord2lat(points[i][1],masterscale,basey)
 302       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 303       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 304       node=points[i][2].to_i
 305       tagstr=array2tag(points[i][4])
 306           tagstr=tagstr.gsub(/[\000-\037]/,"")
 307       tagsql="'"+sqlescape(tagstr)+"'"
 308
 309       # compare node
 310       if node<0
 311         # new node - create
 312                 if renumberednodes[node.to_s].nil?
 313                         newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags) VALUES (           #{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 314                                         ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{newnode},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 315                         points[i][2]=newnode
 316                         renumberednodes[node.to_s]=newnode.to_s
 317                 else
 318                         points[i][2]=renumberednodes[node.to_s].to_i
 319                 end
 320
 321       elsif xc.has_key?(node)
 322         # old node from original way - update
 323         if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node])
 324           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{node},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 325           ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{ys},longitude=#{xs},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1 WHERE id=#{node}")
 326         end
 327       else
 328         # old node, created in another way and now added to this way
 329       end
 330
 331     end
 332
 333
 334     # -- 6.i compare segments
 335
 336     numberedsegments={}
 337     seglist=''                          # list of existing segments that we want to keep
 338     for i in (0..(points.length-2))
 339       if (points[i+1][3].to_i==0) then next end
 340       segid=points[i+1][5].to_i
 341       from =points[i  ][2].to_i
 342       to   =points[i+1][2].to_i
 343       if seg.has_key?(segid)
 344                 # if segment exists, check it still refers to the same nodes
 345         if seg[segid]=="#{from}-#{to}" then
 346           if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 347           next
 348         end
 349           elsif segid>0
 350                 # not in previous version of way, but supplied, so assume
 351                 # that it's come from makeway (i.e. unwayed segments)
 352                 if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 353                 next
 354       end
 355       segid=ActiveRecord::Base.connection.insert("INSERT INTO current_segments (   node_a,node_b,timestamp,user_id,visible,tags) VALUES (         #{from},#{to},#{db_now},#{uid},1,'')")
 356                 ActiveRecord::Base.connection.insert("INSERT INTO segments         (id,node_a,node_b,timestamp,user_id,visible,tags) VALUES (#{segid},#{from},#{to},#{db_now},#{uid},1,'')")
 357       points[i+1][5]=segid
 358       numberedsegments[(i+1).to_s]=segid.to_s
 359     end
 360
 361
 362     # -- 6.ii insert new way segments
 363
 364     createuniquesegments(way,db_uqs,seglist)    # segments which appear in this way but no other
 365
 366     #           delete segments from uniquesegments (and not in modified way)
 367
 368     sql=<<-EOF
 369       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 370       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 371         FROM current_segments AS cs, #{db_uqs} AS us
 372        WHERE cs.id=us.segment_id AND cs.visible=1
 373     EOF
 374     ActiveRecord::Base.connection.insert(sql)
 375
 376     sql=<<-EOF
 377          UPDATE current_segments AS cs, #{db_uqs} AS us
 378           SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 379         WHERE cs.id=us.segment_id AND cs.visible=1
 380     EOF
 381     ActiveRecord::Base.connection.update(sql)
 382
 383     #           delete nodes not in modified way or any other segments
 384
 385     createuniquenodes(db_uqs,db_uqn)    # nodes which appear in this way but no other
 386
 387     sql=<<-EOF
 388                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 389                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 390                   FROM current_nodes AS cn,#{db_uqn}
 391                  WHERE cn.id=node_id
 392     EOF
 393     ActiveRecord::Base.connection.insert(sql)
 394
 395     sql=<<-EOF
 396       UPDATE current_nodes AS cn, #{db_uqn}
 397          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 398        WHERE cn.id=node_id
 399     EOF
 400     ActiveRecord::Base.connection.update(sql)
 401
 402     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 403     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 404
 405     #           insert new version of route into way_segments
 406
 407     insertsql =''
 408     currentsql=''
 409     sequence  =1
 410     for i in (0..(points.length-2))
 411       if (points[i+1][3].to_i==0) then next end
 412       if insertsql !='' then insertsql +=',' end
 413       if currentsql!='' then currentsql+=',' end
 414       insertsql +="(#{way},#{points[i+1][5]},#{version})"
 415       currentsql+="(#{way},#{points[i+1][5]},#{sequence})"
 416       sequence  +=1
 417     end
 418
 419     ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}");
 420     ActiveRecord::Base.connection.insert("INSERT INTO         way_segments (id,segment_id,version    ) VALUES #{insertsql}");
 421     ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}");
 422
 423     # -- 7. insert new way tags
 424
 425     insertsql =''
 426     currentsql=''
 427     attributes.each do |k,v|
 428       if v=='' or v.nil? then next end
 429       if v[0,6]=='(type ' then next end
 430       if insertsql !='' then insertsql +=',' end
 431       if currentsql!='' then currentsql+=',' end
 432           k=k.gsub(/[\000-\037]/,"")
 433           v=v.gsub(/[\000-\037]/,"")
 434       insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',#{version})"
 435       currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')"
 436     end
 437
 438     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 439     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 440     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 441
 442     [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax]
 443   end
 444
 445   # -----       deleteway (user token, way)
 446   #                     returns way ID only
 447
 448   def deleteway(args)
 449     usertoken,way=args
 450
 451     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 452
 453     uid=getuserid(usertoken); if !uid then return end
 454         way=way.to_i
 455
 456         db_uqs='uniq'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # temp uniquesegments table name, typically 51 chars
 457         db_uqn='unin'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # temp uniquenodes table name, typically 51 chars
 458         db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # 'now' variable name, typically 51 chars
 459         ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 460         createuniquesegments(way,db_uqs,'')
 461
 462         # -     delete any otherwise unused segments
 463
 464         sql=<<-EOF
 465       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 466       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 467         FROM current_segments AS cs, #{db_uqs} AS us
 468        WHERE cs.id=us.segment_id
 469     EOF
 470         ActiveRecord::Base.connection.insert(sql)
 471
 472         sql=<<-EOF
 473       UPDATE current_segments AS cs, #{db_uqs} AS us
 474          SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 475        WHERE cs.id=us.segment_id
 476     EOF
 477         ActiveRecord::Base.connection.update(sql)
 478
 479         # - delete any unused nodes
 480
 481     createuniquenodes(db_uqs,db_uqn)
 482
 483         sql=<<-EOF
 484                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 485                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 486                   FROM current_nodes AS cn,#{db_uqn}
 487                  WHERE cn.id=node_id
 488     EOF
 489         ActiveRecord::Base.connection.insert(sql)
 490
 491         sql=<<-EOF
 492       UPDATE current_nodes AS cn, #{db_uqn}
 493          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 494        WHERE cn.id=node_id
 495     EOF
 496         ActiveRecord::Base.connection.update(sql)
 497
 498         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 499         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 500
 501         # - delete way
 502
 503         ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 504         ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 505         ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}")
 506         ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 507
 508         way
 509 end
 510
 511 # ----- makeway(x,y,baselong,basey,masterscale)
 512 #               returns way made from unwayed segments
 513
 514 def makeway(args)
 515         usertoken,x,y,baselong,basey,masterscale=args
 516     uid=getuserid(usertoken)
 517     return if !uid
 518
 519         points=[]
 520         toreverse=[]                            # segments to reverse
 521         nodesused={}                            # so we don't go over the same node twice
 522
 523         # - find start point near x
 524
 525         xc=coord2long(x,masterscale,baselong)
 526         yc=coord2lat(y,masterscale,basey)
 527
 528         RAILS_DEFAULT_LOGGER.info("  Message: makeway, xc=#{xc}, y=#{yc}")
 529
 530         xs1=xc-0.001; xs2=xc+0.001
 531         ys1=yc-0.001; ys2=yc+0.001
 532
 533         sql=<<-EOF
 534                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 535                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 536                   FROM current_nodes AS cn1,
 537                        current_nodes AS cn2,
 538                        current_segments AS cs
 539                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 540                  WHERE (cn1.longitude BETWEEN #{xs1} AND #{xs2})
 541                    AND (cn1.latitude  BETWEEN #{ys1} AND #{ys2})
 542                    AND segment_id IS NULL
 543                    AND cs.visible=1
 544                    AND cn1.id=node_a AND cn1.visible=1
 545                    AND cn2.id=node_b AND cn2.visible=1
 546               ORDER BY SQRT(POW(cn1.longitude-#{xc},2)+
 547                                 POW(cn1.latitude -#{yc},2))
 548          LIMIT 1
 549         EOF
 550         row=ActiveRecord::Base.connection.select_one sql
 551         if row.nil? then return [0,0,0,0,0] end
 552         xs1=long2coord(row['lon1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 553         xs2=long2coord(row['lon2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 554         xmin=[xs1,xs2].min; xmax=[xs1,xs2].max
 555         ymin=[ys1,ys2].min; ymax=[ys1,ys2].max
 556         nodesused[row['id1'].to_i]=true
 557         nodesused[row['id2'].to_i]=true
 558         points<<[xs1,ys1,row['id1'].to_i,1,{},0]
 559         points<<[xs2,ys2,row['id2'].to_i,1,{},row['segid'].to_i]
 560
 561         # - extend at start, then end
 562         while (a,point,nodesused,toreverse=findconnect(points[0][2],nodesused,'b',toreverse,baselong,basey,masterscale))[0]
 563                 points[0][5]=point[5]; point[5]=0       # segment leads to next node
 564                 points.unshift(point)
 565                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 566                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 567         end
 568         while (a,point,nodesused,toreverse=findconnect(points[-1][2],nodesused,'a',toreverse,baselong,basey,masterscale))[0]
 569                 points.push(point)
 570                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 571                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 572         end
 573         points[0][3]=0  # start with a move
 574
 575         # reverse segments in toreverse
 576         if toreverse.length>0
 577                 sql=<<-EOF
 578                         UPDATE current_segments c1, current_segments c2
 579                            SET c1.node_a=c2.node_b,c1.node_b=c2.node_a,
 580                                c1.timestamp=NOW(),c1.user_id=#{uid}
 581                          WHERE c1.id=c2.id
 582                            AND c1.id IN (#{toreverse.join(',')})
 583                 EOF
 584                 ActiveRecord::Base.connection.update sql
 585                 sql=<<-EOF
 586                         INSERT INTO segments
 587                    (SELECT * FROM current_segments
 588                      WHERE id IN (#{toreverse.join(',')}))
 589                 EOF
 590                 ActiveRecord::Base.connection.insert sql
 591         end
 592
 593         [points,xmin,xmax,ymin,ymax]
 594 end
 595
 596 def findconnect(id,nodesused,lookfor,toreverse,baselong,basey,masterscale)
 597         # get all segments with 'id' as a point
 598         # (to look for both node_a and node_b, UNION is faster than node_a=id OR node_b=id)!
 599         sql=<<-EOF
 600                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 601                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 602                   FROM current_nodes AS cn1,
 603                        current_nodes AS cn2,
 604                        current_segments AS cs
 605                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 606                  WHERE segment_id IS NULL
 607                    AND cs.visible=1
 608                    AND cn1.id=node_a AND cn1.visible=1
 609                    AND cn2.id=node_b AND cn2.visible=1
 610                    AND node_a=#{id}
 611         UNION
 612                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 613                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 614                   FROM current_nodes AS cn1,
 615                        current_nodes AS cn2,
 616                        current_segments AS cs
 617                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 618                  WHERE segment_id IS NULL
 619                    AND cs.visible=1
 620                    AND cn1.id=node_a AND cn1.visible=1
 621                    AND cn2.id=node_b AND cn2.visible=1
 622                    AND node_b=#{id}
 623         EOF
 624         connectlist=ActiveRecord::Base.connection.select_all sql
 625
 626         if lookfor=='b' then tocol='id1'; tolat='lat1'; tolon='lon1'; fromcol='id2'; fromlat='lat2'; fromlon='lon2'
 627                                         else tocol='id2'; tolat='lat2'; tolon='lon2'; fromcol='id1'; fromlat='lat1'; fromlon='lon1'
 628         end
 629
 630         # eliminate those already in the hash
 631         connex=0
 632         point=nil
 633         connectlist.each { |row|
 634                 tonode=row[tocol].to_i
 635                 fromnode=row[fromcol].to_i
 636                 if id==tonode and !nodesused.has_key?(fromnode)
 637                         # wrong way round; add, then add to 'segments to reverse' list
 638                         connex+=1
 639                         nodesused[fromnode]=true
 640                         point=[long2coord(row[fromlon].to_f,baselong,masterscale),lat2coord(row[fromlat].to_f,basey,masterscale),fromnode,1,{},row['segid'].to_i]
 641                         toreverse.push(row['segid'].to_i)
 642                 elsif id==fromnode and !nodesused.has_key?(tonode)
 643                         # right way round; just add
 644                         connex+=1
 645                         point=[long2coord(row[tolon].to_f,baselong,masterscale),lat2coord(row[tolat].to_f,basey,masterscale),tonode,1,{},row['segid'].to_i]
 646                         nodesused[tonode]=true
 647                 end
 648         }
 649
 650         # if only one left, then add it; otherwise return false
 651         if connex!=1 or point.nil? then
 652                 return [false,[],nodesused,toreverse]
 653         else
 654                 return [true,point,nodesused,toreverse]
 655         end
 656 end
 657
 658
 659 # ====================================================================
 660 # Support functions for remote calls
 661
 662 def readwayquery(id)
 663   ActiveRecord::Base.connection.select_all "SELECT n1.latitude AS lat1,n1.longitude AS long1,n1.id AS id1,n1.tags as tags1, "+
 664       "           n2.latitude AS lat2,n2.longitude AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+
 665       "    FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+
 666       "   WHERE current_way_segments.id=#{id} "+
 667       "     AND segment_id=current_segments.id "+
 668           "     AND current_segments.visible=1 "+
 669       "     AND n1.id=node_a and n2.id=node_b "+
 670       "     AND n1.visible=1 AND n2.visible=1 "+
 671       "   ORDER BY sequence_id"
 672 end
 673
 674 def createuniquesegments(way,uqs_name,seglist)
 675   # Finds segments which appear in (previous version of) this way and no other
 676   sql=<<-EOF
 677       CREATE TEMPORARY TABLE #{uqs_name}
 678               SELECT a.segment_id
 679                 FROM (SELECT DISTINCT segment_id FROM current_way_segments
 680                   WHERE id = #{way}) a
 681              LEFT JOIN current_way_segments b
 682                 ON b.segment_id = a.segment_id
 683                  AND b.id != #{way}
 684                WHERE b.segment_id IS NULL
 685     EOF
 686   if (seglist!='') then sql+=" AND a.segment_id NOT IN (#{seglist})" end
 687   ActiveRecord::Base.connection.execute(sql)
 688 end
 689
 690 def createuniquenodes(uqs_name,uqn_name)
 691         # Finds nodes which appear in uniquesegments but no other segments
 692         sql=<<-EOF
 693                 CREATE TEMPORARY TABLE #{uqn_name}
 694                            SELECT DISTINCT node_id
 695                               FROM (SELECT cn.id AS node_id
 696                                                   FROM current_nodes AS cn,
 697                                                        current_segments AS cs,
 698                                                        #{uqs_name} AS us
 699                                                  WHERE cs.id=us.segment_id
 700                                                    AND (cn.id=cs.node_a OR cn.id=cs.node_b)) AS n
 701                                          LEFT JOIN current_segments AS cs2 ON node_id=cs2.node_a AND cs2.visible=1
 702                                          LEFT JOIN current_segments AS cs3 ON node_id=cs3.node_b AND cs3.visible=1
 703                                              WHERE cs2.node_a IS NULL
 704                                                AND cs3.node_b IS NULL
 705         EOF
 706         ActiveRecord::Base.connection.execute(sql)
 707 end
 708
 709 def sqlescape(a)
 710   a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
 711 end
 712
 713 def tag2array(a)
 714   tags={}
 715   a.gsub(';;;','#%').split(';').each do |b|
 716     b.gsub!('#%',';;;')
 717     b.gsub!('===','#%')
 718     k,v=b.split('=')
 719     if k.nil? then k='' end
 720     if v.nil? then v='' end
 721     tags[k.gsub('#%','=')]=v.gsub('#%','=')
 722   end
 723   tags
 724 end
 725
 726 def array2tag(a)
 727   str=''
 728   a.each do |k,v|
 729     if v=='' then next end
 730     if v[0,6]=='(type ' then next end
 731     if str!='' then str+=';' end
 732     str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===')
 733   end
 734   str
 735 end
 736
 737 def getuserid(token)
 738   token=sqlescape(token)
 739   if (token=~/^(.+)\+(.+)$/) then
 740     return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND email='#{$1}' AND pass_crypt=MD5('#{$2}')")
 741   else
 742     return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND token='#{token}'")
 743   end
 744 end
 745
 746
 747
 748 # ====================================================================
 749 # AMF read subroutines
 750
 751 # ----- getint          return two-byte integer
 752 # ----- getlong         return four-byte long
 753 # ----- getstring       return string with two-byte length
 754 # ----- getdouble       return eight-byte double-precision float
 755 # ----- getobject       return object/hash
 756 # ----- getarray        return numeric array
 757
 758 def getint(s)
 759   s.getc*256+s.getc
 760 end
 761
 762 def getlong(s)
 763   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 764 end
 765
 766 def getstring(s)
 767   len=s.getc*256+s.getc
 768   s.read(len)
 769 end
 770
 771 def getdouble(s)
 772   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 773   a[0]
 774 end
 775
 776 def getarray(s)
 777   len=getlong(s)
 778   arr=[]
 779   for i in (0..len-1)
 780     arr[i]=getvalue(s)
 781   end
 782   arr
 783 end
 784
 785 def getobject(s)
 786   arr={}
 787   while (key=getstring(s))
 788     if (key=='') then break end
 789     arr[key]=getvalue(s)
 790   end
 791   s.getc                # skip the 9 'end of object' value
 792   arr
 793 end
 794
 795 # ----- getvalue        parse and get value
 796
 797 def getvalue(s)
 798   case s.getc
 799   when 0;       return getdouble(s)                     # number
 800   when 1;       return s.getc                           # boolean
 801   when 2;       return getstring(s)                     # string
 802   when 3;       return getobject(s)                     # object/hash
 803   when 5;       return nil                                      # null
 804   when 6;       return nil                                      # undefined
 805   when 8;       s.read(4)                                       # mixedArray
 806                     return getobject(s)                 #  |
 807   when 10;      return getarray(s)                      # array
 808   else;         return nil                                      # error
 809   end
 810 end
 811
 812 # ====================================================================
 813 # AMF write subroutines
 814
 815 # ----- putdata         envelope data into AMF writeable form
 816 # ----- encodevalue     pack variables as AMF
 817
 818 def putdata(index,n)
 819   d =encodestring(index+"/onResult")
 820   d+=encodestring("null")
 821   d+=[-1].pack("N")
 822   d+=encodevalue(n)
 823 end
 824
 825 def encodevalue(n)
 826   case n.class.to_s
 827   when 'Array'
 828     a=10.chr+encodelong(n.length)
 829     n.each do |b|
 830       a+=encodevalue(b)
 831     end
 832     a
 833   when 'Hash'
 834     a=3.chr
 835     n.each do |k,v|
 836       a+=encodestring(k)+encodevalue(v)
 837     end
 838     a+0.chr+0.chr+9.chr
 839   when 'String'
 840     2.chr+encodestring(n)
 841   when 'Bignum','Fixnum','Float'
 842     0.chr+encodedouble(n)
 843   when 'NilClass'
 844     5.chr
 845   else
 846     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 847   end
 848 end
 849
 850 # ----- encodestring    encode string with two-byte length
 851 # ----- encodedouble    encode number as eight-byte double precision float
 852 # ----- encodelong              encode number as four-byte long
 853
 854 def encodestring(n)
 855   a,b=n.size.divmod(256)
 856   a.chr+b.chr+n
 857 end
 858
 859 def encodedouble(n)
 860   [n].pack('G')
 861 end
 862
 863 def encodelong(n)
 864   [n].pack('N')
 865 end
 866
 867 # ====================================================================
 868 # Co-ordinate conversion
 869
 870 def lat2coord(a,basey,masterscale)
 871   -(lat2y(a)-basey)*masterscale+250
 872 end
 873
 874 def long2coord(a,baselong,masterscale)
 875   (a-baselong)*masterscale+350
 876 end
 877
 878 def lat2y(a)
 879   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 880 end
 881
 882 def coord2lat(a,masterscale,basey)
 883   y2lat((a-250)/-masterscale+basey)
 884 end
 885
 886 def coord2long(a,masterscale,baselong)
 887   (a-350)/masterscale+baselong
 888 end
 889
 890 def y2lat(a)
 891   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 892 end
 893
 894 end