app/controllers/amf_controller.rb

   1 class AmfController < ApplicationController
   2   require 'stringio'
   3
   4   session :off
   5   before_filter :check_write_availability
   6
   7   # AMF controller for Potlatch
   8   # ---------------------------
   9   # All interaction between Potlatch (as a .SWF application) and the
  10   # OSM database takes place using this controller. Messages are
  11   # encoded in the Actionscript Message Format (AMF).
  12   #
  13   # Public domain. Set your tab width to 4 to read this document. :)
  14   # editions Systeme D / Richard Fairhurst 2004-2007
  15
  16   # to log:
  17   # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
  18
  19   # ====================================================================
  20   # Main AMF handler
  21
  22   # ---- talk   process AMF request
  23
  24   def talk
  25     req=StringIO.new(request.raw_post+0.chr)    # Get POST data as request
  26                                                                                         # (cf http://www.ruby-forum.com/topic/122163)
  27     req.read(2)                                                                 # Skip version indicator and client ID
  28     results={}                                                                  # Results of each body
  29
  30     # -------------
  31     # Parse request
  32
  33     headers=getint(req)                                 # Read number of headers
  34
  35     headers.times do                                # Read each header
  36       name=getstring(req)                               #  |
  37       req.getc                                  #  | skip boolean
  38       value=getvalue(req)                               #  |
  39       header["name"]=value                              #  |
  40     end
  41
  42     bodies=getint(req)                                  # Read number of bodies
  43     bodies.times do                                     # Read each body
  44       message=getstring(req)                    #  | get message name
  45       index=getstring(req)                              #  | get index in response sequence
  46       bytes=getlong(req)                                #  | get total size in bytes
  47       args=getvalue(req)                                #  | get response (probably an array)
  48
  49       case message
  50                   when 'getpresets';            results[index]=putdata(index,getpresets)
  51                   when 'whichways';                     results[index]=putdata(index,whichways(args))
  52                   when 'whichways_deleted';     results[index]=putdata(index,whichways_deleted(args))
  53                   when 'getway';                        results[index]=putdata(index,getway(args))
  54                   when 'getway_old';            results[index]=putdata(index,getway_old(args))
  55                   when 'getway_history';        results[index]=putdata(index,getway_history(args))
  56                   when 'putway';                        results[index]=putdata(index,putway(args))
  57                   when 'deleteway';                     results[index]=putdata(index,deleteway(args))
  58                   when 'putpoi';                        results[index]=putdata(index,putpoi(args))
  59                   when 'getpoi';                        results[index]=putdata(index,getpoi(args))
  60       end
  61     end
  62
  63     # ------------------
  64     # Write out response
  65
  66     RAILS_DEFAULT_LOGGER.info("  Response: start")
  67     a,b=results.length.divmod(256)
  68         render :content_type => "application/x-amf", :text => proc { |response, output|
  69         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  70                 results.each do |k,v|
  71                   output.write(v)
  72                 end
  73         }
  74     RAILS_DEFAULT_LOGGER.info("  Response: end")
  75
  76   end
  77
  78   private
  79
  80   # ====================================================================
  81   # Remote calls
  82
  83   # ----- getpresets
  84   #           return presets,presetmenus and presetnames arrays
  85
  86   def getpresets
  87     presets={}
  88     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]; presetmenus['POI']=[]
  89     presetnames={}; presetnames['point']={}; presetnames['way']={}; presetnames['POI']={}
  90     presettype=''
  91     presetcategory=''
  92
  93     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
  94
  95     #           File.open("config/potlatch/presets.txt") do |file|
  96
  97     # Temporary patch to get around filepath problem
  98     # To remove this patch and make the code nice again:
  99     # 1. uncomment above line
 100     # 2. fix the path in the above line
 101     # 3. delete this here document, and the following line (StringIO....)
 102
 103     txt=<<-EOF
 104 way/road
 105 motorway: highway=motorway,ref=(type road number)
 106 trunk road: highway=trunk,ref=(type road number),name=(type road name)
 107 primary road: highway=primary,ref=(type road number),name=(type road name)
 108 secondary road: highway=secondary,ref=(type road number),name=(type road name)
 109 tertiary road: highway=tertiary,ref=,name=(type road name)
 110 residential road: highway=residential,ref=,name=(type road name)
 111 unclassified road: highway=unclassified,ref=,name=(type road name)
 112
 113 way/footway
 114 footpath: highway=footway,foot=yes
 115 bridleway: highway=bridleway,foot=yes
 116 byway: highway=unsurfaced,foot=yes
 117 permissive path: highway=footway,foot=permissive
 118
 119 way/cycleway
 120 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 121 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 122 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 123 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 124
 125 way/waterway
 126 canal: waterway=canal,name=(type name here)
 127 navigable river: waterway=river,boat=yes,name=(type name here)
 128 navigable drain: waterway=drain,boat=yes,name=(type name here)
 129 derelict canal: waterway=derelict_canal,name=(type name here)
 130 unnavigable river: waterway=river,boat=no,name=(type name here)
 131 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 132
 133 way/railway
 134 railway: railway=rail
 135 tramway: railway=tram
 136 light railway: railway=light_rail
 137 preserved railway: railway=preserved
 138 disused railway tracks: railway=disused
 139 course of old railway: railway=abandoned
 140
 141 way/natural
 142 lake: natural=water,landuse=
 143 forest: landuse=forest,natural=
 144
 145 point/road
 146 mini roundabout: highway=mini_roundabout
 147 traffic lights: highway=traffic_signals
 148
 149 point/footway
 150 bridge: highway=bridge
 151 gate: highway=gate
 152 stile: highway=stile
 153 cattle grid: highway=cattle_grid
 154
 155 point/cycleway
 156 gate: highway=gate
 157
 158 point/waterway
 159 lock gate: waterway=lock_gate
 160 weir: waterway=weir
 161 aqueduct: waterway=aqueduct
 162 winding hole: waterway=turning_point
 163 mooring: waterway=mooring
 164
 165 point/railway
 166 station: railway=station
 167 viaduct: railway=viaduct
 168 level crossing: railway=crossing
 169
 170 point/natural
 171 peak: natural=peak
 172
 173 POI/road
 174 car park: amenity=parking
 175 petrol station: amenity=fuel
 176
 177 POI/cycleway
 178 bike park: amenity=bicycle_parking
 179
 180 POI/place
 181 city: place=city,name=(type name here),is_in=(type region or county)
 182 town: place=town,name=(type name here),is_in=(type region or county)
 183 suburb: place=suburb,name=(type name here),is_in=(type region or county)
 184 village: place=village,name=(type name here),is_in=(type region or county)
 185 hamlet: place=hamlet,name=(type name here),is_in=(type region or county)
 186
 187 POI/tourism
 188 attraction: tourism=attraction,amenity=,religion=,denomination=
 189 church: tourism=,amenity=place_of_worship,name=(type name here),religion=christian,denomination=(type denomination here)
 190 hotel: tourism=hotel,amenity=,religion=,denomination=
 191 other religious: tourism=,amenity=place_of_worship,name=(type name here),religion=(type religion),denomination=
 192 post box: amenity=post_box,tourism=,name=,religion=,denomination=
 193 post office: amenity=post_office,tourism=,name=,religion=,denomination=
 194 pub: tourism=,amenity=pub,name=(type name here),religion=,denomination=
 195
 196 POI/natural
 197 peak: point=peak
 198 EOF
 199
 200     StringIO.open(txt) do |file|
 201       file.each_line {|line|
 202         t=line.chomp
 203         if (t=~/(\w+)\/(\w+)/) then
 204           presettype=$1
 205           presetcategory=$2
 206           presetmenus[presettype].push(presetcategory)
 207           presetnames[presettype][presetcategory]=["(no preset)"]
 208         elsif (t=~/^(.+):\s?(.+)$/) then
 209           pre=$1; kv=$2
 210           presetnames[presettype][presetcategory].push(pre)
 211           presets[pre]={}
 212           kv.split(',').each {|a|
 213             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 214           }
 215         end
 216       }
 217     end
 218     return [presets,presetmenus,presetnames]
 219   end
 220
 221   # ----- whichways(left,bottom,right,top)
 222   #               return array of ways in current bounding box
 223   #               at present, instead of using correct (=more complex) SQL to find
 224   #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 225
 226   def whichways(args)
 227     xmin = args[0].to_f-0.01
 228     ymin = args[1].to_f-0.01
 229     xmax = args[2].to_f+0.01
 230     ymax = args[3].to_f+0.01
 231     baselong    = args[4]
 232     basey       = args[5]
 233     masterscale = args[6]
 234
 235     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 236
 237     waylist = ActiveRecord::Base.connection.select_all("SELECT DISTINCT current_way_nodes.id AS wayid"+
 238        "  FROM current_way_nodes,current_nodes,current_ways "+
 239        " WHERE current_nodes.id=current_way_nodes.node_id "+
 240        "   AND current_nodes.visible=1 "+
 241        "   AND current_ways.id=current_way_nodes.id "+
 242        "   AND current_ways.visible=1 "+
 243        "   AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes."))
 244
 245     ways = waylist.collect {|a| a['wayid'].to_i } # get an array of way IDs
 246
 247     pointlist = ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lng,current_nodes.tags "+
 248        "  FROM current_nodes "+
 249        "  LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id "+
 250        " WHERE "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")+
 251        "   AND cwn.id IS NULL "+
 252        "   AND current_nodes.visible=1")
 253
 254     points = pointlist.collect {|a| [a['id'],long2coord(a['lng'].to_f,baselong,masterscale),lat2coord(a['lat'].to_f,basey,masterscale),tag2array(a['tags'])]    } # get a list of node ids and their tags
 255
 256     return [ways,points]
 257   end
 258
 259   # ----- whichways_deleted(left,bottom,right,top)
 260   #               return array of deleted ways in current bounding box
 261
 262   def whichways_deleted(args)
 263     xmin = args[0].to_f-0.01
 264     ymin = args[1].to_f-0.01
 265     xmax = args[2].to_f+0.01
 266     ymax = args[3].to_f+0.01
 267     baselong    = args[4]
 268     basey       = args[5]
 269     masterscale = args[6]
 270
 271         sql=<<-EOF
 272                  SELECT DISTINCT current_ways.id
 273                    FROM current_nodes,way_nodes,current_ways
 274                   WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
 275                         AND way_nodes.node_id=current_nodes.id
 276                         AND way_nodes.id=current_ways.id
 277                         AND current_nodes.visible=0
 278                         AND current_ways.visible=0
 279         EOF
 280     waylist = ActiveRecord::Base.connection.select_all(sql)
 281     ways = waylist.collect {|a| a['id'].to_i }
 282         [ways]
 283   end
 284
 285   # ----- getway (objectname, way, baselong, basey, masterscale)
 286   #               returns objectname, array of co-ordinates, attributes,
 287   #                               xmin,xmax,ymin,ymax
 288
 289   def getway(args)
 290     objname,wayid,baselong,basey,masterscale=args
 291     wayid = wayid.to_i
 292     points = []
 293     xmin = ymin =  999999
 294     xmax = ymax = -999999
 295
 296     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 297
 298     readwayquery(wayid).each {|row|
 299       points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,nil,tag2array(row['tags'])]
 300       xmin = [xmin,row['longitude'].to_f].min
 301       xmax = [xmax,row['longitude'].to_f].max
 302       ymin = [ymin,row['latitude'].to_f].min
 303       ymax = [ymax,row['latitude'].to_f].max
 304     }
 305
 306     attributes={}
 307     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 308     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
 309
 310     [objname,points,attributes,xmin,xmax,ymin,ymax]
 311   end
 312
 313   # -----       getway_old (objectname, way, version, baselong, basey, masterscale)
 314   #                     returns old version of way
 315
 316   def getway_old(args)
 317     RAILS_DEFAULT_LOGGER.info("  Message: getway_old (server is #{SERVER_URL})")
 318         return if SERVER_URL=='www.openstreetmap.org'
 319
 320     objname,wayid,version,baselong,basey,masterscale=args
 321     wayid = wayid.to_i
 322     version = version.to_i
 323     xmin = ymin =  999999
 324     xmax = ymax = -999999
 325         points=[]
 326         if version<0
 327           historic=false
 328           version=getlastversion(wayid,version)
 329         else
 330           historic=true
 331         end
 332         readwayquery_old(wayid,version,historic).each { |row|
 333       points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,row['visible'].to_i,tag2array(row['tags'].to_s)]
 334       xmin=[xmin,row['longitude'].to_f].min
 335       xmax=[xmax,row['longitude'].to_f].max
 336       ymin=[ymin,row['latitude' ].to_f].min
 337       ymax=[ymax,row['latitude' ].to_f].max
 338         }
 339
 340         # get tags from this version
 341     attributes={}
 342     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM way_tags WHERE id=#{wayid} AND version=#{version}"
 343     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
 344         attributes['history']="Retrieved from v"+version.to_s
 345
 346     [objname,points,attributes,xmin,xmax,ymin,ymax,version]
 347   end
 348
 349   # -----       getway_history (way)
 350   #                     returns array of previous versions (version,timestamp,visible,user)
 351   #                     should also show 'created_by'
 352
 353   def getway_history(wayid)
 354         history=[]
 355         sql=<<-EOF
 356         SELECT version,timestamp,visible,display_name,data_public
 357           FROM ways,users
 358          WHERE ways.id=#{wayid}
 359            AND ways.user_id=users.id
 360          ORDER BY version DESC
 361         EOF
 362         histlist=ActiveRecord::Base.connection.select_all(sql)
 363         histlist.each { |row|
 364                 if row['data_public'] then user=row['display_name'] else user='anonymous' end
 365                 history<<[row['version'],row['timestamp'],row['visible'],user]
 366         }
 367         [history]
 368   end
 369
 370   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 371   #                                     baselong, basey, masterscale)
 372   #                     returns current way ID, new way ID, hash of renumbered nodes,
 373   #                                     xmin,xmax,ymin,ymax
 374
 375   # ** needs to be updated so that nodes with visible=0 (i.e. undeleted)
 376   #     no longer cause a problem
 377   #    best way to do this would be to know which version it was recovered from;
 378   #             then replace readwayquery with historic query. Line 506 would also need
 379   #             to check if visible had changed, and update if so
 380   #        (a side-effect is that merging/splitting ways will need to be forbidden
 381   #             for undeleted ways, I think)
 382
 383   def putway(args)
 384     RAILS_DEFAULT_LOGGER.info("  putway started")
 385     usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args
 386     uid=getuserid(usertoken)
 387     return if !uid
 388     RAILS_DEFAULT_LOGGER.info("  putway authenticated happily")
 389     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
 390     db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 391     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 392     originalway=originalway.to_i
 393         oldversion=oldversion.to_i
 394
 395     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 396
 397     # -- 3.     read original way into memory
 398
 399     xc={}; yc={}; tagc={}; vc={}
 400     if originalway>0
 401       way=originalway
 402           if oldversion==0
 403             readwayquery(way).each { |row|
 404                   id=row['id'].to_i
 405                   xc[id]=row['longitude'].to_f
 406                   yc[id]=row['latitude' ].to_f
 407                   tagc[id]=row['tags']
 408                   vc[id]=1
 409                 }
 410           else
 411             readwayquery_old(way,oldversion,true).each { |row|
 412                   id=row['id'].to_i
 413                   if (id>0) then
 414                         xc[id]=row['longitude'].to_f
 415                         yc[id]=row['latitude' ].to_f
 416                         tagc[id]=row['tags']
 417                         vc[id]=row['visible'].to_i
 418                   end
 419                 }
 420           end
 421       ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 422     else
 423       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 424     end
 425
 426     # -- 4.     get version by inserting new row into ways
 427
 428     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 429
 430     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 431
 432     xmin=ymin= 999999
 433     xmax=ymax=-999999
 434     insertsql=''
 435     renumberednodes={}
 436         nodelist=[]
 437
 438     points.each_index do |i|
 439       xs=coord2long(points[i][0],masterscale,baselong)
 440       ys=coord2lat(points[i][1],masterscale,basey)
 441       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 442       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 443       node=points[i][2].to_i
 444           tagstr=array2tag(points[i][4])
 445       tagsql="'"+sqlescape(tagstr)+"'"
 446       lat=(ys * 10000000).round
 447       long=(xs * 10000000).round
 448       tile=QuadTile.tile_for_point(ys, xs)
 449
 450       # compare node
 451       if node<0
 452         # new node - create
 453                 if renumberednodes[node.to_s].nil?
 454           newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (           #{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
 455                   ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newnode},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
 456           points[i][2]=newnode
 457           nodelist.push(newnode)
 458           renumberednodes[node.to_s]=newnode.to_s
 459                 else
 460           points[i][2]=renumberednodes[node.to_s].to_i
 461                 end
 462
 463       elsif xc.has_key?(node)
 464                 nodelist.push(node)
 465         # old node from original way - update
 466         if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node] or vc[node]==0)
 467           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{node},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
 468           ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1,tile=#{tile} WHERE id=#{node}")
 469         end
 470       else
 471         # old node, created in another way and now added to this way
 472       end
 473     end
 474
 475
 476         # -- 6a. delete any nodes not in modified way
 477
 478     createuniquenodes(way,db_uqn,nodelist)      # nodes which appear in this way but no other
 479
 480     sql=<<-EOF
 481         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 482         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 483           FROM current_nodes AS cn,#{db_uqn}
 484          WHERE cn.id=node_id
 485     EOF
 486     ActiveRecord::Base.connection.insert(sql)
 487
 488     sql=<<-EOF
 489       UPDATE current_nodes AS cn, #{db_uqn}
 490          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 491        WHERE cn.id=node_id
 492     EOF
 493     ActiveRecord::Base.connection.update(sql)
 494
 495         deleteuniquenoderelations(db_uqn,uid,db_now)
 496     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 497
 498         #       6b. insert new version of route into way_nodes
 499
 500     insertsql =''
 501     currentsql=''
 502     sequence  =1
 503     points.each do |p|
 504       if insertsql !='' then insertsql +=',' end
 505       if currentsql!='' then currentsql+=',' end
 506       insertsql +="(#{way},#{p[2]},#{sequence},#{version})"
 507       currentsql+="(#{way},#{p[2]},#{sequence})"
 508       sequence  +=1
 509     end
 510
 511     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}");
 512     ActiveRecord::Base.connection.insert( "INSERT INTO         way_nodes (id,node_id,sequence_id,version) VALUES #{insertsql}");
 513     ActiveRecord::Base.connection.insert( "INSERT INTO current_way_nodes (id,node_id,sequence_id        ) VALUES #{currentsql}");
 514
 515     # -- 7. insert new way tags
 516
 517     insertsql =''
 518     currentsql=''
 519     attributes.each do |k,v|
 520       if v=='' or v.nil? then next end
 521       if v[0,6]=='(type ' then next end
 522       if insertsql !='' then insertsql +=',' end
 523       if currentsql!='' then currentsql+=',' end
 524       insertsql +="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"',#{version})"
 525       currentsql+="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"')"
 526     end
 527
 528     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 529     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 530     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 531
 532     [originalway,way,renumberednodes,xmin,xmax,ymin,ymax]
 533   end
 534
 535   # -----       putpoi (user token, id, x,y,tag array,visible,baselong,basey,masterscale)
 536   #                     returns current id, new id
 537   #                     if new: add new row to current_nodes and nodes
 538   #                     if old: add new row to nodes, update current_nodes
 539
 540   def putpoi(args)
 541     usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
 542     uid=getuserid(usertoken)
 543     return if !uid
 544     db_now='@now'+uid.to_s+id.to_i.abs.to_s+Time.new.to_i.to_s  # 'now' variable name, typically 51 chars
 545     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 546
 547     id=id.to_i
 548     visible=visible.to_i
 549         if visible==0 then
 550                 # if deleting, check node hasn't become part of a way
 551                 inway=ActiveRecord::Base.connection.select_one("SELECT cw.id FROM current_ways cw,current_way_nodes cwn WHERE cw.id=cwn.id AND cw.visible=1 AND cwn.node_id=#{id} LIMIT 1")
 552                 unless inway.nil? then return [id,id] end       # should really return an error
 553                 deleteitemrelations(id,'node',uid,db_now)
 554         end
 555
 556     x=coord2long(x.to_f,masterscale,baselong)
 557     y=coord2lat(y.to_f,masterscale,basey)
 558     tagsql="'"+sqlescape(array2tag(tags))+"'"
 559     lat=(y * 10000000).round
 560     long=(x * 10000000).round
 561     tile=QuadTile.tile_for_point(y, x)
 562
 563     if (id>0) then
 564         ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{id},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
 565         ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},visible=#{visible},tags=#{tagsql},tile=#{tile} WHERE id=#{id}");
 566         newid=id
 567     else
 568         newid=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
 569               ActiveRecord::Base.connection.update("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newid},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
 570     end
 571     [id,newid]
 572   end
 573
 574   # -----       getpoi (id,baselong,basey,masterscale)
 575   #                     returns id,x,y,tag array
 576
 577   def getpoi(args)
 578         id,baselong,basey,masterscale=args; id=id.to_i
 579         poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+
 580                 "FROM current_nodes WHERE visible=1 AND id=#{id}")
 581         if poi.nil? then return [nil,nil,nil,''] end
 582         [id,
 583          long2coord(poi['lng'].to_f,baselong,masterscale),
 584          lat2coord(poi['lat'].to_f,basey,masterscale),
 585          tag2array(poi['tags'])]
 586   end
 587
 588   # -----       deleteway (user token, way, nodes to keep)
 589   #                     returns way ID only
 590
 591   def deleteway(args)
 592     usertoken,way,preserve=args
 593
 594     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 595
 596     uid=getuserid(usertoken); if !uid then return end
 597     way=way.to_i
 598
 599     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
 600     db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 601     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 602
 603     # - delete any otherwise unused nodes
 604
 605     createuniquenodes(way,db_uqn,[])
 606
 607         unless (preserve.empty?) then
 608                 ActiveRecord::Base.connection.execute("DELETE FROM #{db_uqn} WHERE node_id IN ("+preserve.join(',')+")")
 609         end
 610
 611     sql=<<-EOF
 612         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 613         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 614           FROM current_nodes AS cn,#{db_uqn}
 615          WHERE cn.id=node_id
 616     EOF
 617     ActiveRecord::Base.connection.insert(sql)
 618
 619     sql=<<-EOF
 620       UPDATE current_nodes AS cn, #{db_uqn}
 621          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 622        WHERE cn.id=node_id
 623     EOF
 624     ActiveRecord::Base.connection.update(sql)
 625
 626         deleteuniquenoderelations(db_uqn,uid,db_now)
 627     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 628
 629     # - delete way
 630
 631     ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 632     ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 633     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}")
 634     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 635         deleteitemrelations(way,'way',uid,db_now)
 636     way
 637 end
 638
 639
 640
 641 # ====================================================================
 642 # Support functions for remote calls
 643
 644 def readwayquery(id)
 645   ActiveRecord::Base.connection.select_all "SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags "+
 646       "    FROM current_way_nodes,current_nodes "+
 647       "   WHERE current_way_nodes.id=#{id} "+
 648       "     AND current_way_nodes.node_id=current_nodes.id "+
 649       "     AND current_nodes.visible=1 "+
 650       "   ORDER BY sequence_id"
 651 end
 652
 653 def getlastversion(id,version)
 654   row=ActiveRecord::Base.connection.select_one("SELECT version FROM ways WHERE id=#{id} AND visible=1 ORDER BY version DESC LIMIT 1")
 655   row['version']
 656 end
 657
 658 def readwayquery_old(id,version,historic)
 659   # Node handling on undelete (historic=false):
 660   # - always use the node specified, even if it's moved
 661
 662   # Node handling on revert (historic=true):
 663   # - if it's a visible node, use a new node id (i.e. not mucking up the old one)
 664   #   which means the SWF needs to allocate new ids
 665   # - if it's an invisible node, we can reuse the old node id
 666
 667   # get node list from specified version of way,
 668   # and the _current_ lat/long/tags of each node
 669
 670   row=ActiveRecord::Base.connection.select_one("SELECT timestamp FROM ways WHERE version=#{version} AND id=#{id}")
 671   waytime=row['timestamp']
 672
 673   sql=<<-EOF
 674         SELECT cn.id,visible,latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags
 675           FROM way_nodes wn,current_nodes cn
 676          WHERE wn.version=#{version}
 677            AND wn.id=#{id}
 678            AND wn.node_id=cn.id
 679          ORDER BY sequence_id
 680   EOF
 681   rows=ActiveRecord::Base.connection.select_all(sql)
 682
 683   # if historic (full revert), get the old version of each node,
 684   # and use this (though with a new id) if it differs from the current one
 685   if historic then
 686         rows.each_index do |i|
 687           sql=<<-EOF
 688           SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags
 689             FROM nodes
 690            WHERE id=#{rows[i]['id']}
 691              AND timestamp<="#{waytime}"
 692            ORDER BY timestamp DESC
 693            LIMIT 1
 694           EOF
 695           row=ActiveRecord::Base.connection.select_one(sql)
 696           unless row.nil? then
 697             nx=row['longitude'].to_f
 698             ny=row['latitude'].to_f
 699             if (nx!=rows[i]['longitude'].to_f or ny!=rows[i]['latitude'].to_f or row['tags']!=rows[i]['tags']) then
 700                   rows[i]['id']=-1
 701                   # This generates a new node id if x/y/tags differ from current node.
 702                   # Strictly speaking, it need only do this for uniquenodes, but we're
 703                   # not generating uniquenodes for historic ways (yet!).
 704             end
 705                 rows[i]['longitude']=nx
 706                 rows[i]['latitude' ]=ny
 707                 rows[i]['tags'     ]=row['tags']
 708           end
 709     end
 710   end
 711   rows
 712 end
 713
 714 def createuniquenodes(way,uqn_name,nodelist)
 715         # Find nodes which appear in this way but no others
 716         sql=<<-EOF
 717         CREATE TEMPORARY TABLE #{uqn_name}
 718                                         SELECT a.node_id
 719                                           FROM (SELECT DISTINCT node_id FROM current_way_nodes
 720                                                         WHERE id=#{way}) a
 721                                  LEFT JOIN current_way_nodes b
 722                                                 ON b.node_id=a.node_id
 723                                            AND b.id!=#{way}
 724                                          WHERE b.node_id IS NULL
 725         EOF
 726         unless nodelist.empty? then
 727           sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
 728         end
 729         ActiveRecord::Base.connection.execute(sql)
 730 end
 731
 732
 733
 734 # ====================================================================
 735 # Relations handling
 736 # deleteuniquenoderelations(uqn_name,uid,db_now)
 737 # deleteitemrelations(way|node,'way'|'node',uid,db_now)
 738
 739 def deleteuniquenoderelations(uqn_name,uid,db_now)
 740         sql=<<-EOF
 741         SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr
 742          WHERE crm.member_id=node_id
 743            AND crm.member_type='node'
 744            AND crm.id=cr.id
 745            AND cr.visible=1
 746         EOF
 747
 748         relnodes=ActiveRecord::Base.connection.select_all(sql)
 749         relnodes.each do |a|
 750                 removefromrelation(a['node_id'],'node',a['id'],uid,db_now)
 751         end
 752 end
 753
 754 def deleteitemrelations(objid,type,uid,db_now)
 755         sql=<<-EOF
 756         SELECT cr.id FROM current_relation_members crm,current_relations cr
 757          WHERE crm.member_id=#{objid}
 758            AND crm.member_type='#{type}'
 759            AND crm.id=cr.id
 760            AND cr.visible=1
 761         EOF
 762
 763         relways=ActiveRecord::Base.connection.select_all(sql)
 764         relways.each do |a|
 765                 removefromrelation(objid,type,a['id'],uid,db_now)
 766         end
 767 end
 768
 769 def removefromrelation(objid,type,relation,uid,db_now)
 770         rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
 771
 772         tagsql=<<-EOF
 773         INSERT INTO relation_tags (id,k,v,version)
 774         SELECT id,k,v,#{rver} FROM current_relation_tags
 775          WHERE id=#{relation}
 776         EOF
 777         ActiveRecord::Base.connection.insert(tagsql)
 778
 779         membersql=<<-EOF
 780         INSERT INTO relation_members (id,member_type,member_id,member_role,version)
 781         SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members
 782          WHERE id=#{relation}
 783            AND (member_id!=#{objid} OR member_type!='#{type}')
 784         EOF
 785         ActiveRecord::Base.connection.insert(membersql)
 786
 787         ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
 788         ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
 789 end
 790
 791
 792 def sqlescape(a)
 793   a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr,92.chr+92.chr)
 794 end
 795
 796 def tag2array(a)
 797   tags={}
 798   a.gsub(';;;','#%').split(';').each do |b|
 799     b.gsub!('#%',';;;')
 800     b.gsub!('===','#%')
 801     k,v=b.split('=')
 802     if k.nil? then k='' end
 803     if v.nil? then v='' end
 804     tags[k.gsub('#%','=').gsub(':','|')]=v.gsub('#%','=')
 805   end
 806   tags
 807 end
 808
 809 def array2tag(a)
 810   str=''
 811   a.each do |k,v|
 812     if v=='' then next end
 813     if v[0,6]=='(type ' then next end
 814     if str!='' then str+=';' end
 815     str+=k.gsub(';',';;;').gsub('=','===').gsub('|',':')+'='+v.gsub(';',';;;').gsub('=','===')
 816   end
 817   str
 818 end
 819
 820 def getuserid(token)
 821   if (token =~ /^(.+)\+(.+)$/) then
 822     user = User.authenticate(:username => $1, :password => $2)
 823   else
 824     user = User.authenticate(:token => token)
 825   end
 826
 827   return user ? user.id : nil;
 828 end
 829
 830
 831
 832 # ====================================================================
 833 # AMF read subroutines
 834
 835 # ----- getint          return two-byte integer
 836 # ----- getlong         return four-byte long
 837 # ----- getstring       return string with two-byte length
 838 # ----- getdouble       return eight-byte double-precision float
 839 # ----- getobject       return object/hash
 840 # ----- getarray        return numeric array
 841
 842 def getint(s)
 843   s.getc*256+s.getc
 844 end
 845
 846 def getlong(s)
 847   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 848 end
 849
 850 def getstring(s)
 851   len=s.getc*256+s.getc
 852   s.read(len)
 853 end
 854
 855 def getdouble(s)
 856   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 857   a[0]
 858 end
 859
 860 def getarray(s)
 861   len=getlong(s)
 862   arr=[]
 863   for i in (0..len-1)
 864     arr[i]=getvalue(s)
 865   end
 866   arr
 867 end
 868
 869 def getobject(s)
 870   arr={}
 871   while (key=getstring(s))
 872     if (key=='') then break end
 873     arr[key]=getvalue(s)
 874   end
 875   s.getc                # skip the 9 'end of object' value
 876   arr
 877 end
 878
 879 # ----- getvalue        parse and get value
 880
 881 def getvalue(s)
 882   case s.getc
 883         when 0; return getdouble(s)                     # number
 884         when 1; return s.getc                           # boolean
 885         when 2; return getstring(s)                     # string
 886         when 3; return getobject(s)                     # object/hash
 887         when 5; return nil                                      # null
 888         when 6; return nil                                      # undefined
 889         when 8; s.read(4)                                       # mixedArray
 890                         return getobject(s)                     #  |
 891         when 10;return getarray(s)                      # array
 892         else;   return nil                                      # error
 893   end
 894 end
 895
 896 # ====================================================================
 897 # AMF write subroutines
 898
 899 # ----- putdata         envelope data into AMF writeable form
 900 # ----- encodevalue     pack variables as AMF
 901
 902 def putdata(index,n)
 903   d =encodestring(index+"/onResult")
 904   d+=encodestring("null")
 905   d+=[-1].pack("N")
 906   d+=encodevalue(n)
 907 end
 908
 909 def encodevalue(n)
 910   case n.class.to_s
 911   when 'Array'
 912     a=10.chr+encodelong(n.length)
 913     n.each do |b|
 914       a+=encodevalue(b)
 915     end
 916     a
 917   when 'Hash'
 918     a=3.chr
 919     n.each do |k,v|
 920       a+=encodestring(k)+encodevalue(v)
 921     end
 922     a+0.chr+0.chr+9.chr
 923   when 'String'
 924     2.chr+encodestring(n)
 925   when 'Bignum','Fixnum','Float'
 926     0.chr+encodedouble(n)
 927   when 'NilClass'
 928     5.chr
 929   else
 930     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 931   end
 932 end
 933
 934 # ----- encodestring    encode string with two-byte length
 935 # ----- encodedouble    encode number as eight-byte double precision float
 936 # ----- encodelong              encode number as four-byte long
 937
 938 def encodestring(n)
 939   a,b=n.size.divmod(256)
 940   a.chr+b.chr+n
 941 end
 942
 943 def encodedouble(n)
 944   [n].pack('G')
 945 end
 946
 947 def encodelong(n)
 948   [n].pack('N')
 949 end
 950
 951 # ====================================================================
 952 # Co-ordinate conversion
 953
 954 def lat2coord(a,basey,masterscale)
 955   -(lat2y(a)-basey)*masterscale+250
 956 end
 957
 958 def long2coord(a,baselong,masterscale)
 959   (a-baselong)*masterscale+350
 960 end
 961
 962 def lat2y(a)
 963   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 964 end
 965
 966 def coord2lat(a,masterscale,basey)
 967   y2lat((a-250)/-masterscale+basey)
 968 end
 969
 970 def coord2long(a,masterscale,baselong)
 971   (a-350)/masterscale+baselong
 972 end
 973
 974 def y2lat(a)
 975   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 976 end
 977
 978 end