app/controllers/amf_controller.rb

   1 class AmfController < ApplicationController
   2   require 'stringio'
   3
   4   session :off
   5   before_filter :check_availability
   6
   7   # to log:
   8   # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
   9
  10   # ====================================================================
  11   # Main AMF handler
  12
  13   # ---- talk   process AMF request
  14
  15   def talk
  16     req=StringIO.new(request.raw_post)  # Get POST data as request
  17     req.read(2)                                                 # Skip version indicator and client ID
  18     results={}                                                  # Results of each body
  19
  20     # -------------
  21     # Parse request
  22
  23     headers=getint(req)                                 # Read number of headers
  24
  25     headers.times do                                # Read each header
  26       name=getstring(req)                               #  |
  27       req.getc                                  #  | skip boolean
  28       value=getvalue(req)                               #  |
  29       header["name"]=value                              #  |
  30     end
  31
  32     bodies=getint(req)                                  # Read number of bodies
  33     bodies.times do                                     # Read each body
  34       message=getstring(req)                    #  | get message name
  35       index=getstring(req)                              #  | get index in response sequence
  36       bytes=getlong(req)                                #  | get total size in bytes
  37       args=getvalue(req)                                #  | get response (probably an array)
  38
  39       case message
  40                   when 'getpresets';    results[index]=putdata(index,getpresets)
  41                   when 'whichways';             results[index]=putdata(index,whichways(args))
  42                   when 'getway';                results[index]=putdata(index,getway(args))
  43                   when 'putway';                results[index]=putdata(index,putway(args))
  44                   when 'deleteway';             results[index]=putdata(index,deleteway(args))
  45                   when 'makeway';               results[index]=putdata(index,makeway(args))
  46       end
  47     end
  48
  49     # ------------------
  50     # Write out response
  51
  52     RAILS_DEFAULT_LOGGER.info("  Response: start")
  53     a,b=results.length.divmod(256)
  54         render :content_type => "application/x-amf", :text => proc { |response, output|
  55         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  56                 results.each do |k,v|
  57                   output.write(v)
  58                 end
  59         }
  60     RAILS_DEFAULT_LOGGER.info("  Response: end")
  61
  62   end
  63
  64   private
  65
  66   # ====================================================================
  67   # Remote calls
  68
  69   # ----- getpresets
  70   #           return presets,presetmenus and presetnames arrays
  71
  72   def getpresets
  73     presets={}
  74     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]
  75     presetnames={}; presetnames['point']={}; presetnames['way']={}
  76     presettype=''
  77     presetcategory=''
  78
  79     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
  80
  81     #           File.open("config/potlatch/presets.txt") do |file|
  82
  83     # Temporary patch to get around filepath problem
  84     # To remove this patch and make the code nice again:
  85     # 1. uncomment above line
  86     # 2. fix the path in the above line
  87     # 3. delete this here document, and the following line (StringIO....)
  88
  89     txt=<<-EOF
  90 way/road
  91 motorway: highway=motorway,ref=(type road number)
  92 trunk road: highway=trunk,ref=(type road number),name=(type road name)
  93 primary road: highway=primary,ref=(type road number),name=(type road name)
  94 secondary road: highway=secondary,ref=(type road number),name=(type road name)
  95 residential road: highway=residential,name=(type road name)
  96 unclassified road: highway=unclassified,name=(type road name)
  97
  98 way/footway
  99 footpath: highway=footway,foot=yes
 100 bridleway: highway=bridleway,foot=yes,horse=yes,bicycle=yes
 101 byway: highway=byway,foot=yes,horse=yes,bicycle=yes,motorcar=yes
 102 permissive path: highway=footway,foot=permissive
 103
 104 way/cycleway
 105 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 106 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 107 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 108 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 109
 110 way/waterway
 111 canal: waterway=canal,name=(type name here)
 112 navigable river: waterway=river,boat=yes,name=(type name here)
 113 navigable drain: waterway=drain,boat=yes,name=(type name here)
 114 derelict canal: waterway=derelict_canal,name=(type name here)
 115 unnavigable river: waterway=river,boat=no,name=(type name here)
 116 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 117
 118 way/railway
 119 railway: railway=rail
 120 tramway: railway=tram
 121 light railway: railway=light_rail
 122 preserved railway: railway=preserved
 123 disused railway tracks: railway=disused
 124 course of old railway: railway=abandoned
 125
 126 way/natural
 127 forest: natural=wood,landuse=forest
 128 woodland: natural=wood,landuse=
 129 reservoir: natural=water,landuse=reservoir
 130 lake: natural=water,landuse=
 131 marsh: natural=marsh
 132 beach: natural=beach
 133 coastline: natural=coastline
 134
 135 point/road
 136 mini roundabout: highway=mini_roundabout
 137 traffic lights: highway=traffic_signals
 138
 139 point/footway
 140 bridge: highway=bridge
 141 gate: highway=gate
 142 stile: highway=stile
 143 cattle grid: highway=cattle_grid
 144
 145 point/cycleway
 146 gate: highway=gate
 147
 148 point/waterway
 149 lock gate: waterway=lock_gate
 150 weir: waterway=weir
 151 aqueduct: waterway=aqueduct
 152 winding hole: waterway=turning_point
 153 mooring: waterway=mooring
 154
 155 point/railway
 156 station: railway=station
 157 viaduct: railway=viaduct
 158 level crossing: railway=crossing
 159
 160 point/natural
 161 peak: natural=peak
 162 EOF
 163
 164     StringIO.open(txt) do |file|
 165       file.each_line {|line|
 166         t=line.chomp
 167         if (t=~/(\w+)\/(\w+)/) then
 168           presettype=$1
 169           presetcategory=$2
 170           presetmenus[presettype].push(presetcategory)
 171           presetnames[presettype][presetcategory]=["(no preset)"]
 172         elsif (t=~/^(.+):\s?(.+)$/) then
 173           pre=$1; kv=$2
 174           presetnames[presettype][presetcategory].push(pre)
 175           presets[pre]={}
 176           kv.split(',').each {|a|
 177             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 178           }
 179         end
 180       }
 181     end
 182     return [presets,presetmenus,presetnames]
 183   end
 184
 185   # ----- whichways(left,bottom,right,top)
 186   #               return array of ways in current bounding box
 187   #               at present, instead of using correct (=more complex) SQL to find
 188   #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 189
 190   def whichways(args)
 191     xmin = args[0].to_f-0.01
 192     ymin = args[1].to_f-0.01
 193     xmax = args[2].to_f+0.01
 194     ymax = args[3].to_f+0.01
 195
 196     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 197
 198     waylist=WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+
 199        "  FROM current_way_segments,current_segments,current_nodes,current_ways "+
 200        " WHERE segment_id=current_segments.id "+
 201        "   AND current_segments.visible=1 "+
 202        "   AND node_a=current_nodes.id "+
 203            "   AND current_ways.id=current_way_segments.id "+
 204            "   AND current_ways.visible=1 "+
 205        "   AND (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 206        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+")")
 207
 208        ways = waylist.collect {|a| a.wayid.to_i } # get an array of way id's
 209
 210        pointlist =ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.tags "+
 211        "  FROM current_nodes "+
 212        "  LEFT OUTER JOIN current_segments cs1 ON cs1.node_a=current_nodes.id "+
 213        "  LEFT OUTER JOIN current_segments cs2 ON cs2.node_b=current_nodes.id "+
 214        " WHERE (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 215        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+") "+
 216        "   AND cs1.id IS NULL AND cs2.id IS NULL "+
 217        "   AND current_nodes.visible=1")
 218
 219             points = pointlist.collect {|a| [a['id'],tag2array(a['tags'])]      } # get a list of node ids and their tags
 220
 221     return [ways,points]
 222   end
 223
 224   # ----- getway (objectname, way, baselong, basey, masterscale)
 225   #               returns objectname, array of co-ordinates, attributes,
 226   #                               xmin,xmax,ymin,ymax
 227
 228   def getway(args)
 229     objname,wayid,baselong,basey,masterscale=args
 230     wayid = wayid.to_i
 231     points = []
 232     lastid = -1
 233     xmin = ymin = 999999
 234     xmax = ymax = -999999
 235
 236     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 237
 238     readwayquery(wayid).each {|row|
 239       xs1=long2coord(row['long1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 240       xs2=long2coord(row['long2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 241       points << [xs1,ys1,row['id1'].to_i,0,tag2array(row['tags1']),0] if (row['id1'].to_i!=lastid)
 242       lastid = row['id2'].to_i
 243       points << [xs2,ys2,row['id2'].to_i,1,tag2array(row['tags2']),row['segment_id'].to_i]
 244       xmin = [xmin,row['long1'].to_f,row['long2'].to_f].min
 245       xmax = [xmax,row['long1'].to_f,row['long2'].to_f].max
 246       ymin = [ymin,row['lat1'].to_f,row['lat2'].to_f].min
 247       ymax = [ymax,row['lat1'].to_f,row['lat2'].to_f].max
 248     }
 249
 250     attributes={}
 251     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 252     attrlist.each {|a| attributes[a['k']]=a['v'] }
 253
 254     [objname,points,attributes,xmin,xmax,ymin,ymax]
 255   end
 256
 257   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 258   #                                     baselong, basey, masterscale)
 259   #                     returns current way ID, new way ID, hash of renumbered nodes,
 260   #                                     xmin,xmax,ymin,ymax
 261
 262   def putway(args)
 263     usertoken,originalway,points,attributes,baselong,basey,masterscale=args
 264     uid=getuserid(usertoken)
 265     return if !uid
 266     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
 267     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
 268     db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 269     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 270     originalway=originalway.to_i
 271
 272     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 273
 274     # -- 3.     read original way into memory
 275
 276     xc={}; yc={}; tagc={}; seg={}
 277     if originalway>0
 278       way=originalway
 279       readwayquery(way).each { |row|
 280         id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1']
 281         id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2']
 282         seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s
 283       }
 284           ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 285     else
 286       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 287     end
 288
 289     # -- 4.     get version by inserting new row into ways
 290
 291     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 292
 293     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 294
 295     xmin = ymin = 999999
 296     xmax = ymax = -999999
 297     insertsql = ''
 298     renumberednodes={}
 299
 300     points.each_index do |i|
 301       xs=coord2long(points[i][0],masterscale,baselong)
 302       ys=coord2lat(points[i][1],masterscale,basey)
 303       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 304       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 305       node=points[i][2].to_i
 306       tagstr=array2tag(points[i][4])
 307           tagstr=tagstr.gsub(/[\000-\037]/,"")
 308       tagsql="'"+sqlescape(tagstr)+"'"
 309
 310       # compare node
 311       if node<0
 312         # new node - create
 313                 if renumberednodes[node.to_s].nil?
 314                         newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags) VALUES (           #{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 315                                         ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{newnode},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 316                         points[i][2]=newnode
 317                         renumberednodes[node.to_s]=newnode.to_s
 318                 else
 319                         points[i][2]=renumberednodes[node.to_s].to_i
 320                 end
 321
 322       elsif xc.has_key?(node)
 323         # old node from original way - update
 324         if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node])
 325           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{node},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 326           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}")
 327         end
 328       else
 329         # old node, created in another way and now added to this way
 330       end
 331
 332     end
 333
 334
 335     # -- 6.i compare segments
 336
 337     numberedsegments={}
 338     seglist=''                          # list of existing segments that we want to keep
 339     for i in (0..(points.length-2))
 340       if (points[i+1][3].to_i==0) then next end
 341       segid=points[i+1][5].to_i
 342       from =points[i  ][2].to_i
 343       to   =points[i+1][2].to_i
 344       if seg.has_key?(segid)
 345                 # if segment exists, check it still refers to the same nodes
 346         if seg[segid]=="#{from}-#{to}" then
 347           if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 348           next
 349         end
 350           elsif segid>0
 351                 # not in previous version of way, but supplied, so assume
 352                 # that it's come from makeway (i.e. unwayed segments)
 353                 if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 354                 next
 355       end
 356       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,'')")
 357                 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,'')")
 358       points[i+1][5]=segid
 359       numberedsegments[(i+1).to_s]=segid.to_s
 360     end
 361
 362
 363     # -- 6.ii insert new way segments
 364
 365     createuniquesegments(way,db_uqs,seglist)    # segments which appear in this way but no other
 366
 367     #           delete segments from uniquesegments (and not in modified way)
 368
 369     sql=<<-EOF
 370       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 371       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 372         FROM current_segments AS cs, #{db_uqs} AS us
 373        WHERE cs.id=us.segment_id AND cs.visible=1
 374     EOF
 375     ActiveRecord::Base.connection.insert(sql)
 376
 377     sql=<<-EOF
 378          UPDATE current_segments AS cs, #{db_uqs} AS us
 379           SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 380         WHERE cs.id=us.segment_id AND cs.visible=1
 381     EOF
 382     ActiveRecord::Base.connection.update(sql)
 383
 384     #           delete nodes not in modified way or any other segments
 385
 386     createuniquenodes(db_uqs,db_uqn)    # nodes which appear in this way but no other
 387
 388     sql=<<-EOF
 389                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 390                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 391                   FROM current_nodes AS cn,#{db_uqn}
 392                  WHERE cn.id=node_id
 393     EOF
 394     ActiveRecord::Base.connection.insert(sql)
 395
 396     sql=<<-EOF
 397       UPDATE current_nodes AS cn, #{db_uqn}
 398          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 399        WHERE cn.id=node_id
 400     EOF
 401     ActiveRecord::Base.connection.update(sql)
 402
 403     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 404     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 405
 406     #           insert new version of route into way_segments
 407
 408     insertsql =''
 409     currentsql=''
 410     sequence  =1
 411     for i in (0..(points.length-2))
 412       if (points[i+1][3].to_i==0) then next end
 413       if insertsql !='' then insertsql +=',' end
 414       if currentsql!='' then currentsql+=',' end
 415       insertsql +="(#{way},#{points[i+1][5]},#{version})"
 416       currentsql+="(#{way},#{points[i+1][5]},#{sequence})"
 417       sequence  +=1
 418     end
 419
 420     ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}");
 421     ActiveRecord::Base.connection.insert("INSERT INTO         way_segments (id,segment_id,version    ) VALUES #{insertsql}");
 422     ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}");
 423
 424     # -- 7. insert new way tags
 425
 426     insertsql =''
 427     currentsql=''
 428     attributes.each do |k,v|
 429       if v=='' or v.nil? then next end
 430       if v[0,6]=='(type ' then next end
 431       if insertsql !='' then insertsql +=',' end
 432       if currentsql!='' then currentsql+=',' end
 433           k=k.gsub(/[\000-\037]/,"")
 434           v=v.gsub(/[\000-\037]/,"")
 435       insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',#{version})"
 436       currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')"
 437     end
 438
 439     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 440     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 441     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 442
 443     [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax]
 444   end
 445
 446   # -----       deleteway (user token, way)
 447   #                     returns way ID only
 448
 449   def deleteway(args)
 450     usertoken,way=args
 451
 452     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 453
 454     uid=getuserid(usertoken); if !uid then return end
 455         way=way.to_i
 456
 457         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
 458         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
 459         db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # 'now' variable name, typically 51 chars
 460         ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 461         createuniquesegments(way,db_uqs,'')
 462
 463         # -     delete any otherwise unused segments
 464
 465         sql=<<-EOF
 466       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 467       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 468         FROM current_segments AS cs, #{db_uqs} AS us
 469        WHERE cs.id=us.segment_id
 470     EOF
 471         ActiveRecord::Base.connection.insert(sql)
 472
 473         sql=<<-EOF
 474       UPDATE current_segments AS cs, #{db_uqs} AS us
 475          SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 476        WHERE cs.id=us.segment_id
 477     EOF
 478         ActiveRecord::Base.connection.update(sql)
 479
 480         # - delete any unused nodes
 481
 482     createuniquenodes(db_uqs,db_uqn)
 483
 484         sql=<<-EOF
 485                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 486                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 487                   FROM current_nodes AS cn,#{db_uqn}
 488                  WHERE cn.id=node_id
 489     EOF
 490         ActiveRecord::Base.connection.insert(sql)
 491
 492         sql=<<-EOF
 493       UPDATE current_nodes AS cn, #{db_uqn}
 494          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 495        WHERE cn.id=node_id
 496     EOF
 497         ActiveRecord::Base.connection.update(sql)
 498
 499         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 500         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 501
 502         # - delete way
 503
 504         ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 505         ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 506         ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}")
 507         ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 508
 509         way
 510 end
 511
 512 # ----- makeway(x,y,baselong,basey,masterscale)
 513 #               returns way made from unwayed segments
 514
 515 def makeway(args)
 516         usertoken,x,y,baselong,basey,masterscale=args
 517     uid=getuserid(usertoken)
 518     return if !uid
 519
 520         points=[]
 521         toreverse=[]                            # segments to reverse
 522         nodesused={}                            # so we don't go over the same node twice
 523
 524         # - find start point near x
 525
 526         xc=coord2long(x,masterscale,baselong)
 527         yc=coord2lat(y,masterscale,basey)
 528
 529         RAILS_DEFAULT_LOGGER.info("  Message: makeway, xc=#{xc}, y=#{yc}")
 530
 531         xs1=xc-0.001; xs2=xc+0.001
 532         ys1=yc-0.001; ys2=yc+0.001
 533
 534         sql=<<-EOF
 535                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 536                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 537                   FROM current_nodes AS cn1,
 538                        current_nodes AS cn2,
 539                        current_segments AS cs
 540                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 541                  WHERE (cn1.longitude BETWEEN #{xs1} AND #{xs2})
 542                    AND (cn1.latitude  BETWEEN #{ys1} AND #{ys2})
 543                    AND segment_id IS NULL
 544                    AND cs.visible=1
 545                    AND cn1.id=node_a AND cn1.visible=1
 546                    AND cn2.id=node_b AND cn2.visible=1
 547               ORDER BY SQRT(POW(cn1.longitude-#{xc},2)+
 548                                 POW(cn1.latitude -#{yc},2))
 549          LIMIT 1
 550         EOF
 551         row=ActiveRecord::Base.connection.select_one sql
 552         if row.nil? then return [0,0,0,0,0] end
 553         xs1=long2coord(row['lon1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 554         xs2=long2coord(row['lon2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 555         xmin=[xs1,xs2].min; xmax=[xs1,xs2].max
 556         ymin=[ys1,ys2].min; ymax=[ys1,ys2].max
 557         nodesused[row['id1'].to_i]=true
 558         nodesused[row['id2'].to_i]=true
 559         points<<[xs1,ys1,row['id1'].to_i,1,{},0]
 560         points<<[xs2,ys2,row['id2'].to_i,1,{},row['segid'].to_i]
 561
 562         # - extend at start, then end
 563         while (a,point,nodesused,toreverse=findconnect(points[0][2],nodesused,'b',toreverse,baselong,basey,masterscale))[0]
 564                 points[0][5]=point[5]; point[5]=0       # segment leads to next node
 565                 points.unshift(point)
 566                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 567                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 568         end
 569         while (a,point,nodesused,toreverse=findconnect(points[-1][2],nodesused,'a',toreverse,baselong,basey,masterscale))[0]
 570                 points.push(point)
 571                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 572                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 573         end
 574         points[0][3]=0  # start with a move
 575
 576         # reverse segments in toreverse
 577         if toreverse.length>0
 578                 sql=<<-EOF
 579                         UPDATE current_segments c1, current_segments c2
 580                            SET c1.node_a=c2.node_b,c1.node_b=c2.node_a,
 581                                c1.timestamp=NOW(),c1.user_id=#{uid}
 582                          WHERE c1.id=c2.id
 583                            AND c1.id IN (#{toreverse.join(',')})
 584                 EOF
 585                 ActiveRecord::Base.connection.update sql
 586                 sql=<<-EOF
 587                         INSERT INTO segments
 588                    (SELECT * FROM current_segments
 589                      WHERE id IN (#{toreverse.join(',')}))
 590                 EOF
 591                 ActiveRecord::Base.connection.insert sql
 592         end
 593
 594         [points,xmin,xmax,ymin,ymax]
 595 end
 596
 597 def findconnect(id,nodesused,lookfor,toreverse,baselong,basey,masterscale)
 598         # get all segments with 'id' as a point
 599         # (to look for both node_a and node_b, UNION is faster than node_a=id OR node_b=id)!
 600         sql=<<-EOF
 601                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 602                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 603                   FROM current_nodes AS cn1,
 604                        current_nodes AS cn2,
 605                        current_segments AS cs
 606                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 607                  WHERE segment_id IS NULL
 608                    AND cs.visible=1
 609                    AND cn1.id=node_a AND cn1.visible=1
 610                    AND cn2.id=node_b AND cn2.visible=1
 611                    AND node_a=#{id}
 612         UNION
 613                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 614                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 615                   FROM current_nodes AS cn1,
 616                        current_nodes AS cn2,
 617                        current_segments AS cs
 618                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 619                  WHERE segment_id IS NULL
 620                    AND cs.visible=1
 621                    AND cn1.id=node_a AND cn1.visible=1
 622                    AND cn2.id=node_b AND cn2.visible=1
 623                    AND node_b=#{id}
 624         EOF
 625         connectlist=ActiveRecord::Base.connection.select_all sql
 626
 627         if lookfor=='b' then tocol='id1'; tolat='lat1'; tolon='lon1'; fromcol='id2'; fromlat='lat2'; fromlon='lon2'
 628                                         else tocol='id2'; tolat='lat2'; tolon='lon2'; fromcol='id1'; fromlat='lat1'; fromlon='lon1'
 629         end
 630
 631         # eliminate those already in the hash
 632         connex=0
 633         point=nil
 634         connectlist.each { |row|
 635                 tonode=row[tocol].to_i
 636                 fromnode=row[fromcol].to_i
 637                 if id==tonode and !nodesused.has_key?(fromnode)
 638                         # wrong way round; add, then add to 'segments to reverse' list
 639                         connex+=1
 640                         nodesused[fromnode]=true
 641                         point=[long2coord(row[fromlon].to_f,baselong,masterscale),lat2coord(row[fromlat].to_f,basey,masterscale),fromnode,1,{},row['segid'].to_i]
 642                         toreverse.push(row['segid'].to_i)
 643                 elsif id==fromnode and !nodesused.has_key?(tonode)
 644                         # right way round; just add
 645                         connex+=1
 646                         point=[long2coord(row[tolon].to_f,baselong,masterscale),lat2coord(row[tolat].to_f,basey,masterscale),tonode,1,{},row['segid'].to_i]
 647                         nodesused[tonode]=true
 648                 end
 649         }
 650
 651         # if only one left, then add it; otherwise return false
 652         if connex!=1 or point.nil? then
 653                 return [false,[],nodesused,toreverse]
 654         else
 655                 return [true,point,nodesused,toreverse]
 656         end
 657 end
 658
 659
 660 # ====================================================================
 661 # Support functions for remote calls
 662
 663 def readwayquery(id)
 664   ActiveRecord::Base.connection.select_all "SELECT n1.latitude AS lat1,n1.longitude AS long1,n1.id AS id1,n1.tags as tags1, "+
 665       "           n2.latitude AS lat2,n2.longitude AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+
 666       "    FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+
 667       "   WHERE current_way_segments.id=#{id} "+
 668       "     AND segment_id=current_segments.id "+
 669           "     AND current_segments.visible=1 "+
 670       "     AND n1.id=node_a and n2.id=node_b "+
 671       "     AND n1.visible=1 AND n2.visible=1 "+
 672       "   ORDER BY sequence_id"
 673 end
 674
 675 def createuniquesegments(way,uqs_name,seglist)
 676   # Finds segments which appear in (previous version of) this way and no other
 677   sql=<<-EOF
 678       CREATE TEMPORARY TABLE #{uqs_name}
 679               SELECT a.segment_id
 680                 FROM (SELECT DISTINCT segment_id FROM current_way_segments
 681                   WHERE id = #{way}) a
 682              LEFT JOIN current_way_segments b
 683                 ON b.segment_id = a.segment_id
 684                  AND b.id != #{way}
 685                WHERE b.segment_id IS NULL
 686     EOF
 687   if (seglist!='') then sql+=" AND a.segment_id NOT IN (#{seglist})" end
 688   ActiveRecord::Base.connection.execute(sql)
 689 end
 690
 691 def createuniquenodes(uqs_name,uqn_name)
 692         # Finds nodes which appear in uniquesegments but no other segments
 693         sql=<<-EOF
 694                 CREATE TEMPORARY TABLE #{uqn_name}
 695                            SELECT DISTINCT node_id
 696                               FROM (SELECT cn.id AS node_id
 697                                                   FROM current_nodes AS cn,
 698                                                        current_segments AS cs,
 699                                                        #{uqs_name} AS us
 700                                                  WHERE cs.id=us.segment_id
 701                                                    AND (cn.id=cs.node_a OR cn.id=cs.node_b)) AS n
 702                                          LEFT JOIN current_segments AS cs2 ON node_id=cs2.node_a AND cs2.visible=1
 703                                          LEFT JOIN current_segments AS cs3 ON node_id=cs3.node_b AND cs3.visible=1
 704                                              WHERE cs2.node_a IS NULL
 705                                                AND cs3.node_b IS NULL
 706         EOF
 707         ActiveRecord::Base.connection.execute(sql)
 708 end
 709
 710 def sqlescape(a)
 711   a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
 712 end
 713
 714 def tag2array(a)
 715   tags={}
 716   a.gsub(';;;','#%').split(';').each do |b|
 717     b.gsub!('#%',';;;')
 718     b.gsub!('===','#%')
 719     k,v=b.split('=')
 720     if k.nil? then k='' end
 721     if v.nil? then v='' end
 722     tags[k.gsub('#%','=')]=v.gsub('#%','=')
 723   end
 724   tags
 725 end
 726
 727 def array2tag(a)
 728   str=''
 729   a.each do |k,v|
 730     if v=='' then next end
 731     if v[0,6]=='(type ' then next end
 732     if str!='' then str+=';' end
 733     str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===')
 734   end
 735   str
 736 end
 737
 738 def getuserid(token)
 739   if (token =~ /^(.+)\+(.+)$/) then
 740     user = User.authenticate(:username => $1, :password => $2)
 741   else
 742     user = User.authenticate(:token => token)
 743   end
 744
 745   return user ? user.id : nil;
 746 end
 747
 748
 749
 750 # ====================================================================
 751 # AMF read subroutines
 752
 753 # ----- getint          return two-byte integer
 754 # ----- getlong         return four-byte long
 755 # ----- getstring       return string with two-byte length
 756 # ----- getdouble       return eight-byte double-precision float
 757 # ----- getobject       return object/hash
 758 # ----- getarray        return numeric array
 759
 760 def getint(s)
 761   s.getc*256+s.getc
 762 end
 763
 764 def getlong(s)
 765   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 766 end
 767
 768 def getstring(s)
 769   len=s.getc*256+s.getc
 770   s.read(len)
 771 end
 772
 773 def getdouble(s)
 774   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 775   a[0]
 776 end
 777
 778 def getarray(s)
 779   len=getlong(s)
 780   arr=[]
 781   for i in (0..len-1)
 782     arr[i]=getvalue(s)
 783   end
 784   arr
 785 end
 786
 787 def getobject(s)
 788   arr={}
 789   while (key=getstring(s))
 790     if (key=='') then break end
 791     arr[key]=getvalue(s)
 792   end
 793   s.getc                # skip the 9 'end of object' value
 794   arr
 795 end
 796
 797 # ----- getvalue        parse and get value
 798
 799 def getvalue(s)
 800   case s.getc
 801   when 0;       return getdouble(s)                     # number
 802   when 1;       return s.getc                           # boolean
 803   when 2;       return getstring(s)                     # string
 804   when 3;       return getobject(s)                     # object/hash
 805   when 5;       return nil                                      # null
 806   when 6;       return nil                                      # undefined
 807   when 8;       s.read(4)                                       # mixedArray
 808                     return getobject(s)                 #  |
 809   when 10;      return getarray(s)                      # array
 810   else;         return nil                                      # error
 811   end
 812 end
 813
 814 # ====================================================================
 815 # AMF write subroutines
 816
 817 # ----- putdata         envelope data into AMF writeable form
 818 # ----- encodevalue     pack variables as AMF
 819
 820 def putdata(index,n)
 821   d =encodestring(index+"/onResult")
 822   d+=encodestring("null")
 823   d+=[-1].pack("N")
 824   d+=encodevalue(n)
 825 end
 826
 827 def encodevalue(n)
 828   case n.class.to_s
 829   when 'Array'
 830     a=10.chr+encodelong(n.length)
 831     n.each do |b|
 832       a+=encodevalue(b)
 833     end
 834     a
 835   when 'Hash'
 836     a=3.chr
 837     n.each do |k,v|
 838       a+=encodestring(k)+encodevalue(v)
 839     end
 840     a+0.chr+0.chr+9.chr
 841   when 'String'
 842     2.chr+encodestring(n)
 843   when 'Bignum','Fixnum','Float'
 844     0.chr+encodedouble(n)
 845   when 'NilClass'
 846     5.chr
 847   else
 848     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 849   end
 850 end
 851
 852 # ----- encodestring    encode string with two-byte length
 853 # ----- encodedouble    encode number as eight-byte double precision float
 854 # ----- encodelong              encode number as four-byte long
 855
 856 def encodestring(n)
 857   a,b=n.size.divmod(256)
 858   a.chr+b.chr+n
 859 end
 860
 861 def encodedouble(n)
 862   [n].pack('G')
 863 end
 864
 865 def encodelong(n)
 866   [n].pack('N')
 867 end
 868
 869 # ====================================================================
 870 # Co-ordinate conversion
 871
 872 def lat2coord(a,basey,masterscale)
 873   -(lat2y(a)-basey)*masterscale+250
 874 end
 875
 876 def long2coord(a,baselong,masterscale)
 877   (a-baselong)*masterscale+350
 878 end
 879
 880 def lat2y(a)
 881   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 882 end
 883
 884 def coord2lat(a,masterscale,basey)
 885   y2lat((a-250)/-masterscale+basey)
 886 end
 887
 888 def coord2long(a,masterscale,baselong)
 889   (a-350)/masterscale+baselong
 890 end
 891
 892 def y2lat(a)
 893   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 894 end
 895
 896 end