uptodate with en.yml 15663

[rails.git] / app / controllers / amf_controller.rb

diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index b4cbaeaf02c038f9ac4b162be8f5465d7625c343..dd04382187e7c760af923c4fc9d8d3d8430fe665 100644 (file)
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -24,8 +24,11 @@
 # == Debugging
 # 
 # Any method that returns a status code (0 for ok) can also send:
 # == Debugging
 # 
 # Any method that returns a status code (0 for ok) can also send:

-#      return(-1,"message")            <-- just puts up a dialogue
-#      return(-2,"message")            <-- also asks the user to e-mail me
+#      return(-1,"message")            <-- just puts up a dialogue
+#      return(-2,"message")            <-- also asks the user to e-mail me
+# return(-3,["type",v],id)    <-- version conflict
+# return(-4,"type",id)        <-- object not found
+# -5 indicates the method wasn't called (due to a previous error)

 # 
 # To write to the Rails log, use logger.info("message").
 
 # 
 # To write to the Rails log, use logger.info("message").
 


@@ -40,134 +43,192 @@ class AmfController < ApplicationController
   # Help methods for checking boundary sanity and area size
   include MapBoundary
 
   # Help methods for checking boundary sanity and area size
   include MapBoundary
 

-  session :off
-  before_filter :check_write_availability
+  before_filter :check_api_writable

 
   # Main AMF handlers: process the raw AMF string (using AMF library) and
   # calls each action (private method) accordingly.
   # ** FIXME: refactor to reduce duplication of code across read/write
   
   def amf_read
 
   # Main AMF handlers: process the raw AMF string (using AMF library) and
   # calls each action (private method) accordingly.
   # ** FIXME: refactor to reduce duplication of code across read/write
   
   def amf_read

-    req=StringIO.new(request.raw_post+0.chr)# Get POST data as request
-                              # (cf http://www.ruby-forum.com/topic/122163)
-    req.read(2)                                                                # Skip version indicator and client ID
-    results={}                                                         # Results of each body
+    if request.post?
+      req=StringIO.new(request.raw_post+0.chr)# Get POST data as request
+                                # (cf http://www.ruby-forum.com/topic/122163)
+      req.read(2)                                                              # Skip version indicator and client ID
+      results={}                                                               # Results of each body

 
 

-    # Parse request
+      # Parse request

 
 

-    headers=AMF.getint(req)                                    # Read number of headers
+      headers=AMF.getint(req)                          # Read number of headers

 
 

-    headers.times do                                           # Read each header
-      name=AMF.getstring(req)                          #  |
-      req.getc                                                         #  | skip boolean
-      value=AMF.getvalue(req)                          #  |
-      header["name"]=value                                     #  |
-    end
+      headers.times do                                 # Read each header
+        name=AMF.getstring(req)                                #  |
+        req.getc                                       #  | skip boolean
+        value=AMF.getvalue(req)                                #  |
+        header["name"]=value                           #  |
+      end

 
 

-    bodies=AMF.getint(req)                                     # Read number of bodies
-    bodies.times do                                                    # Read each body
-      message=AMF.getstring(req)                       #  | get message name
-      index=AMF.getstring(req)                         #  | get index in response sequence
-      bytes=AMF.getlong(req)                           #  | get total size in bytes
-      args=AMF.getvalue(req)                           #  | get response (probably an array)
-      logger.info("Executing AMF #{message}:#{index}")
-
-      case message
-        when 'getpresets';                     results[index]=AMF.putdata(index,getpresets())
-        when 'whichways';                      results[index]=AMF.putdata(index,whichways(*args))
-        when 'whichways_deleted';      results[index]=AMF.putdata(index,whichways_deleted(*args))
-        when 'getway';                         results[index]=AMF.putdata(index,getway(args[0].to_i))
-        when 'getrelation';                    results[index]=AMF.putdata(index,getrelation(args[0].to_i))
-        when 'getway_old';                     results[index]=AMF.putdata(index,getway_old(args[0].to_i,args[1]))
-        when 'getway_history';         results[index]=AMF.putdata(index,getway_history(args[0].to_i))
-        when 'getnode_history';                results[index]=AMF.putdata(index,getnode_history(args[0].to_i))
-        when 'findgpx';                                results[index]=AMF.putdata(index,findgpx(*args))
-        when 'findrelations';          results[index]=AMF.putdata(index,findrelations(*args))
-        when 'getpoi';                         results[index]=AMF.putdata(index,getpoi(*args))
+      bodies=AMF.getint(req)                           # Read number of bodies
+      bodies.times do                                  # Read each body
+        message=AMF.getstring(req)                     #  | get message name
+        index=AMF.getstring(req)                       #  | get index in response sequence
+        bytes=AMF.getlong(req)                         #  | get total size in bytes
+        args=AMF.getvalue(req)                         #  | get response (probably an array)
+        logger.info("Executing AMF #{message}(#{args.join(',')}):#{index}")
+
+        case message
+          when 'getpresets';        results[index]=AMF.putdata(index,getpresets(args[0]))
+          when 'whichways';         results[index]=AMF.putdata(index,whichways(*args))
+          when 'whichways_deleted'; results[index]=AMF.putdata(index,whichways_deleted(*args))
+          when 'getway';            results[index]=AMF.putdata(index,getway(args[0].to_i))
+          when 'getrelation';       results[index]=AMF.putdata(index,getrelation(args[0].to_i))
+          when 'getway_old';        results[index]=AMF.putdata(index,getway_old(args[0].to_i,args[1]))
+          when 'getway_history';    results[index]=AMF.putdata(index,getway_history(args[0].to_i))
+          when 'getnode_history';   results[index]=AMF.putdata(index,getnode_history(args[0].to_i))
+          when 'findgpx';           results[index]=AMF.putdata(index,findgpx(*args))
+          when 'findrelations';     results[index]=AMF.putdata(index,findrelations(*args))
+          when 'getpoi';            results[index]=AMF.putdata(index,getpoi(*args))
+        end

       end
       end

+      logger.info("Encoding AMF results")
+      sendresponse(results)
+    else
+      render :nothing => true, :status => :method_not_allowed

     end
     end

-    logger.info("encoding AMF results")
-    sendresponse(results)

   end
 
   def amf_write
   end
 
   def amf_write

-    req=StringIO.new(request.raw_post+0.chr)
-    req.read(2)
-    results={}
-    renumberednodes={}                                         # Shared across repeated putways
-    renumberedways={}                                          # Shared across repeated putways
-
-    headers=AMF.getint(req)                                    # Read number of headers
-    headers.times do                                           # Read each header
-      name=AMF.getstring(req)                          #  |
-      req.getc                                                         #  | skip boolean
-      value=AMF.getvalue(req)                          #  |
-      header["name"]=value                                     #  |
-    end
+    if request.post?
+      req=StringIO.new(request.raw_post+0.chr)
+      req.read(2)
+      results={}
+      renumberednodes={}                               # Shared across repeated putways
+      renumberedways={}                                        # Shared across repeated putways
+
+      headers=AMF.getint(req)          # Read number of headers
+      headers.times do                                 # Read each header
+        name=AMF.getstring(req)            #  |
+        req.getc                                             #  | skip boolean
+        value=AMF.getvalue(req)        #  |
+        header["name"]=value           #  |
+      end

 
 

-    bodies=AMF.getint(req)                                     # Read number of bodies
-    bodies.times do                                                    # Read each body
-      message=AMF.getstring(req)                       #  | get message name
-      index=AMF.getstring(req)                         #  | get index in response sequence
-      bytes=AMF.getlong(req)                           #  | get total size in bytes
-      args=AMF.getvalue(req)                           #  | get response (probably an array)
-
-      logger.info("Executing AMF #{message}:#{index}")
-      case message
-        when 'putway';                         r=putway(renumberednodes,*args)
-                                                                       renumberednodes=r[3]
-                                                                       if r[1] != r[2] then renumberedways[r[1]] = r[2] end
-                                                                       results[index]=AMF.putdata(index,r)
-        when 'putrelation';                    results[index]=AMF.putdata(index,putrelation(renumberednodes, renumberedways, *args))
-        when 'deleteway';                      results[index]=AMF.putdata(index,deleteway(*args))
-        when 'putpoi';                         r=putpoi(*args)
-                                                                       if r[1] != r[2] then renumberednodes[r[1]] = r[2] end
-                                                               results[index]=AMF.putdata(index,r)
-        when 'startchangeset';         results[index]=AMF.putdata(index,startchangeset(*args))
+      bodies=AMF.getint(req)           # Read number of bodies
+      bodies.times do                                        # Read each body
+        message=AMF.getstring(req)     #  | get message name
+        index=AMF.getstring(req)               #  | get index in response sequence
+        bytes=AMF.getlong(req)                 #  | get total size in bytes
+        args=AMF.getvalue(req)                 #  | get response (probably an array)
+        err=false                   # Abort batch on error
+
+        logger.info("Executing AMF #{message}:#{index}")
+        if err
+          results[index]=[-5,nil]
+        else
+          case message
+            when 'putway';         orn=renumberednodes.dup
+                                   r=putway(renumberednodes,*args)
+                                   renumberednodes=r[4].dup
+                                   r[4].delete_if { |k,v| orn.has_key?(k) }
+                                   if r[2] != r[3] then renumberedways[r[2]] = r[3] end
+                                   results[index]=AMF.putdata(index,r)
+            when 'putrelation';    results[index]=AMF.putdata(index,putrelation(renumberednodes, renumberedways, *args))
+            when 'deleteway';      results[index]=AMF.putdata(index,deleteway(*args))
+            when 'putpoi';         r=putpoi(*args)
+                                    if r[2] != r[3] then renumberednodes[r[2]] = r[3] end
+                                   results[index]=AMF.putdata(index,r)
+            when 'startchangeset'; results[index]=AMF.putdata(index,startchangeset(*args))
+           end
+          if results[index][0]==-3 then err=true end  # If a conflict is detected, don't execute any more writes
+        end

       end
       end

+      logger.info("Encoding AMF results")
+      sendresponse(results)
+    else
+      render :nothing => true, :status => :method_not_allowed

     end
     end

-    logger.info("encoding AMF results")
-    sendresponse(results)

   end
 
   private
 
   end
 
   private
 

+  def amf_handle_error(call)
+    yield
+  rescue OSM::APIVersionMismatchError => ex
+    return [-3, [ex.type.downcase, ex.latest, ex.id]]
+  rescue OSM::APIUserChangesetMismatchError => ex
+    return [-2, ex.to_s]
+  rescue OSM::APIBadBoundingBox => ex
+    return [-2, "Sorry - I can't get the map for that area. The server said: #{ex.to_s}"]
+  rescue OSM::APIError => ex
+    return [-1, ex.to_s]
+  rescue Exception => ex
+    return [-2, "An unusual error happened (in #{call}). The server said: #{ex.to_s}"]
+  end
+
+  def amf_handle_error_with_timeout(call)
+    amf_handle_error(call) do
+      Timeout::timeout(APP_CONFIG['api_timeout'], OSM::APITimeoutError) do
+        yield
+      end
+    end
+  end
+

   # Start new changeset
   # Start new changeset

+  # Returns success_code,success_message,changeset id

   
   

-  def startchangeset(usertoken, cstags, closeid, closecomment)
-    user = getuser(usertoken)
-    if !user then return -1,"You are not logged in, so Potlatch can't write any changes to the database." end
-
-    # close previous changeset and add comment
-    if closeid
-      cs = Changeset.find(closeid)
-      cs.set_closed_time_now
-      if cs.user_id!=user.id
-        return -2,"You cannot close that changeset because you're not the person who opened it."
-      elsif closecomment.empty?
-        cs.save!
-      else
-        cs.tags['comment']=closecomment
+  def startchangeset(usertoken, cstags, closeid, closecomment, opennew)
+    amf_handle_error("'startchangeset'") do
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so Potlatch can't write any changes to the database." end
+
+      # close previous changeset and add comment
+      if closeid
+        cs = Changeset.find(closeid)
+        cs.set_closed_time_now
+        if cs.user_id!=user.id
+          raise OSM::APIUserChangesetMismatchError.new
+        elsif closecomment.empty?
+          cs.save!
+        else
+          cs.tags['comment']=closecomment
+          cs.save_with_tags!
+        end
+      end
+       
+      # open a new changeset
+      if opennew!=0
+        cs = Changeset.new
+        cs.tags = cstags
+        cs.user_id = user.id
+        if !closecomment.empty? then cs.tags['comment']=closecomment end
+        # smsm1 doesn't like the next two lines and thinks they need to be abstracted to the model more/better
+        cs.created_at = Time.now.getutc
+        cs.closed_at = cs.created_at + Changeset::IDLE_TIMEOUT

         cs.save_with_tags!
         cs.save_with_tags!

+        return [0,'',cs.id]
+      else
+        return [0,'',nil]

       end
     end
       end
     end

-       
-    # open a new changeset
-    cs = Changeset.new
-    cs.tags = cstags
-    cs.user_id = user.id
-    # smsm1 doesn't like the next two lines and thinks they need to be abstracted to the model more/better
-    cs.created_at = Time.now
-    cs.closed_at = cs.created_at + Changeset::IDLE_TIMEOUT
-    cs.save_with_tags!
-    return [0,cs.id]

   end
 
   # Return presets (default tags, localisation etc.):
   # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
 
   end
 
   # Return presets (default tags, localisation etc.):
   # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
 

-  def getpresets() #:doc:
-    return POTLATCH_PRESETS
+  def getpresets(lang) #:doc:
+    lang.gsub!(/[^\w\-]/,'')
+
+    begin
+      localised = YAML::load(File.open("#{RAILS_ROOT}/config/potlatch/localised/#{lang}/localised.yaml"))
+    rescue
+      localised = "" # guess we'll just have to use the hardcoded English text instead
+    end
+
+    begin
+      help = File.read("#{RAILS_ROOT}/config/potlatch/localised/#{lang}/help.html")
+    rescue
+      help = File.read("#{RAILS_ROOT}/config/potlatch/localised/en/help.html")
+    end
+    return POTLATCH_PRESETS+[localised,help]

   end
 
   ##
   end
 
   ##


@@ -176,7 +237,7 @@ class AmfController < ApplicationController
   # are IDs only. 
   #
   # return is of the form: 
   # are IDs only. 
   #
   # return is of the form: 

-  # [error_code, 
+  # [success_code, success_message,

   #  [[way_id, way_version], ...],
   #  [[node_id, lat, lon, [tags, ...], node_version], ...],
   #  [[rel_id, rel_version], ...]]
   #  [[way_id, way_version], ...],
   #  [[node_id, lat, lon, [tags, ...], node_version], ...],
   #  [[rel_id, rel_version], ...]]


@@ -185,70 +246,68 @@ class AmfController < ApplicationController
   # used in any way, rel is any relation which refers to either a way
   # or node that we're returning.
   def whichways(xmin, ymin, xmax, ymax) #:doc:
   # used in any way, rel is any relation which refers to either a way
   # or node that we're returning.
   def whichways(xmin, ymin, xmax, ymax) #:doc:

-    enlarge = [(xmax-xmin)/8,0.01].min
-    xmin -= enlarge; ymin -= enlarge
-    xmax += enlarge; ymax += enlarge
-    
-    # check boundary is sane and area within defined
-    # see /config/application.yml
-    check_boundaries(xmin, ymin, xmax, ymax)
-
-    if POTLATCH_USE_SQL then
-      ways = sql_find_ways_in_area(xmin, ymin, xmax, ymax)
-      points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
-      relations = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, ways.collect {|x| x[0]})
-    else
-      # find the way ids in an area
-      nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_nodes.visible = ?", true], :include => :ways)
-      ways = nodes_in_area.inject([]) { |sum, node| 
-        visible_ways = node.ways.select { |w| w.visible? }
-        sum + visible_ways.collect { |w| [w.id,w.version] }
-      }.uniq
-      ways.delete([])
-
-      # find the node ids in an area that aren't part of ways
-      nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
-      points = nodes_not_used_in_area.collect { |n| [n.id, n.lon, n.lat, n.tags, n.version] }.uniq
-
-      # find the relations used by those nodes and ways
-      relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => {:visible => true}) +
-                  Relation.find_for_ways(ways.collect { |w| w[0] }, :conditions => {:visible => true})
-      relations = relations.collect { |relation| [relation.id,relation.version] }.uniq
-    end
+    amf_handle_error_with_timeout("'whichways'") do
+      enlarge = [(xmax-xmin)/8,0.01].min
+      xmin -= enlarge; ymin -= enlarge
+      xmax += enlarge; ymax += enlarge

 
 

-    [0, ways, points, relations]
+      # check boundary is sane and area within defined
+      # see /config/application.yml
+      check_boundaries(xmin, ymin, xmax, ymax)
+
+      if POTLATCH_USE_SQL then
+        ways = sql_find_ways_in_area(xmin, ymin, xmax, ymax)
+        points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
+        relations = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, ways.collect {|x| x[0]})
+      else
+        # find the way ids in an area
+        nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_nodes.visible = ?", true], :include => :ways)
+        ways = nodes_in_area.inject([]) { |sum, node| 
+          visible_ways = node.ways.select { |w| w.visible? }
+          sum + visible_ways.collect { |w| [w.id,w.version] }
+        }.uniq
+        ways.delete([])
+
+        # find the node ids in an area that aren't part of ways
+        nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
+        points = nodes_not_used_in_area.collect { |n| [n.id, n.lon, n.lat, n.tags, n.version] }.uniq
+
+        # find the relations used by those nodes and ways
+        relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => {:visible => true}) +
+                    Relation.find_for_ways(ways.collect { |w| w[0] }, :conditions => {:visible => true})
+        relations = relations.collect { |relation| [relation.id,relation.version] }.uniq
+      end

 
 

-  rescue Exception => err
-    [-2,"Sorry - I can't get the map for that area."]
+      [0, '', ways, points, relations]
+    end

   end
 
   # Find deleted ways in current bounding box (similar to whichways, but ways
   # with a deleted node only - not POIs or relations).
 
   def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:
   end
 
   # Find deleted ways in current bounding box (similar to whichways, but ways
   # with a deleted node only - not POIs or relations).
 
   def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:

-    enlarge = [(xmax-xmin)/8,0.01].min
-    xmin -= enlarge; ymin -= enlarge
-    xmax += enlarge; ymax += enlarge
+    amf_handle_error_with_timeout("'whichways_deleted'") do
+      enlarge = [(xmax-xmin)/8,0.01].min
+      xmin -= enlarge; ymin -= enlarge
+      xmax += enlarge; ymax += enlarge

 
 

-    # check boundary is sane and area within defined
-    # see /config/application.yml
-    begin
+      # check boundary is sane and area within defined
+      # see /config/application.yml

       check_boundaries(xmin, ymin, xmax, ymax)
       check_boundaries(xmin, ymin, xmax, ymax)

-    rescue Exception => err
-      return [-2,"Sorry - I can't get the map for that area."]
-    end

 
 

-    nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_ways.visible = ?", false], :include => :ways_via_history)
-    way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq
+      nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_ways.visible = ?", false], :include => :ways_via_history)
+      way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq

 
 

-    [0,way_ids]
+      [0,'',way_ids]
+    end

   end
 
   # Get a way including nodes and tags.
   # Returns the way id, a Potlatch-style array of points, a hash of tags, and the version number.
 
   def getway(wayid) #:doc:
   end
 
   # Get a way including nodes and tags.
   # Returns the way id, a Potlatch-style array of points, a hash of tags, and the version number.
 
   def getway(wayid) #:doc:

-    if POTLATCH_USE_SQL then
+    amf_handle_error_with_timeout("'getway' #{wayid}") do
+      if POTLATCH_USE_SQL then

         points = sql_get_nodes_in_way(wayid)
         tags = sql_get_tags_in_way(wayid)
         version = sql_get_way_version(wayid)
         points = sql_get_nodes_in_way(wayid)
         tags = sql_get_tags_in_way(wayid)
         version = sql_get_way_version(wayid)


@@ -256,27 +315,24 @@ class AmfController < ApplicationController
         # Ideally we would do ":include => :nodes" here but if we do that
         # then rails only seems to return the first copy of a node when a
         # way includes a node more than once
         # Ideally we would do ":include => :nodes" here but if we do that
         # then rails only seems to return the first copy of a node when a
         # way includes a node more than once

-        begin
-          way = Way.find(wayid)
-        rescue ActiveRecord::RecordNotFound
-          return [wayid,[],{}]
-        end
+        way = Way.find(:first, :conditions => { :id => wayid }, :include => { :nodes => :node_tags })

 
         # check case where way has been deleted or doesn't exist
 
         # check case where way has been deleted or doesn't exist

-        return [wayid,[],{}] if way.nil? or !way.visible
+        return [-4, 'way', wayid, [], {}, nil] if way.nil? or !way.visible

 
         points = way.nodes.collect do |node|
 
         points = way.nodes.collect do |node|

-        nodetags=node.tags
-        nodetags.delete('created_by')
-        [node.lon, node.lat, node.id, nodetags, node.version]
+          nodetags=node.tags
+          nodetags.delete('created_by')
+          [node.lon, node.lat, node.id, nodetags, node.version]
+        end
+        tags = way.tags
+        version = way.version

       end
       end

-      tags = way.tags
-      version = way.version
-    end

 
 

-    [wayid, points, tags, version]
+      [0, '', wayid, points, tags, version]
+    end

   end
   end

-
+  

   # Get an old version of a way, and all constituent nodes.
   #
   # For undelete (version<0), always uses the most recent version of each node, 
   # Get an old version of a way, and all constituent nodes.
   #
   # For undelete (version<0), always uses the most recent version of each node, 


@@ -293,34 +349,35 @@ class AmfController < ApplicationController
   # 5. is this the current, visible version? (boolean)
   
   def getway_old(id, timestamp) #:doc:
   # 5. is this the current, visible version? (boolean)
   
   def getway_old(id, timestamp) #:doc:

-    if timestamp == ''
-      # undelete
-      old_way = OldWay.find(:first, :conditions => ['visible = ? AND id = ?', true, id], :order => 'version DESC')
-      points = old_way.get_nodes_undelete unless old_way.nil?
-    else
-      begin
-        # revert
-        timestamp = DateTime.strptime(timestamp.to_s, "%d %b %Y, %H:%M:%S")
-        old_way = OldWay.find(:first, :conditions => ['id = ? AND timestamp <= ?', id, timestamp], :order => 'timestamp DESC')
-        unless old_way.nil?
-          points = old_way.get_nodes_revert(timestamp)
-          if !old_way.visible
-            return [-1, "Sorry, the way was deleted at that time - please revert to a previous version."]
+    amf_handle_error_with_timeout("'getway_old' #{id}, #{timestamp}") do
+      if timestamp == ''
+        # undelete
+        old_way = OldWay.find(:first, :conditions => ['visible = ? AND id = ?', true, id], :order => 'version DESC')
+        points = old_way.get_nodes_undelete unless old_way.nil?
+      else
+        begin
+          # revert
+          timestamp = DateTime.strptime(timestamp.to_s, "%d %b %Y, %H:%M:%S")
+          old_way = OldWay.find(:first, :conditions => ['id = ? AND timestamp <= ?', id, timestamp], :order => 'timestamp DESC')
+          unless old_way.nil?
+            points = old_way.get_nodes_revert(timestamp)
+            if !old_way.visible
+              return [-1, "Sorry, the way was deleted at that time - please revert to a previous version.", id, [], {}, nil, false]
+            end

           end
           end

+        rescue ArgumentError
+          # thrown by date parsing method. leave old_way as nil for
+          # the error handler below.

         end
         end

-      rescue ArgumentError
-        # thrown by date parsing method. leave old_way as nil for
-        # the superb error handler below.

       end
       end

-    end

 
 

-    if old_way.nil?
-      # *** FIXME: shouldn't this be returning an error?
-      return [-1, id, [], {}, -1,0]
-    else
-      curway=Way.find(id)
-      old_way.tags['history'] = "Retrieved from v#{old_way.version}"
-      return [0, id, points, old_way.tags, curway.version, (curway.version==old_way.version and curway.visible)]
+      if old_way.nil?
+        return [-1, "Sorry, the server could not find a way at that time.", id, [], {}, nil, false]
+      else
+        curway=Way.find(id)
+        old_way.tags['history'] = "Retrieved from v#{old_way.version}"
+        return [0, '', id, points, old_way.tags, curway.version, (curway.version==old_way.version and curway.visible)]
+      end

     end
   end
   
     end
   end
   


@@ -335,7 +392,6 @@ class AmfController < ApplicationController
   # start date of the way.
 
   def getway_history(wayid) #:doc:
   # start date of the way.
 
   def getway_history(wayid) #:doc:

-

     begin
       # Find list of revision dates for way and all constituent nodes
       revdates=[]
     begin
       # Find list of revision dates for way and all constituent nodes
       revdates=[]


@@ -353,7 +409,7 @@ class AmfController < ApplicationController
       waycreated=revdates[0]
       revdates.uniq!
       revdates.sort!
       waycreated=revdates[0]
       revdates.uniq!
       revdates.sort!

-         revdates.reverse!
+      revdates.reverse!

 
       # Remove any dates (from nodes) before first revision date of way
       revdates.delete_if { |d| d<waycreated }
 
       # Remove any dates (from nodes) before first revision date of way
       revdates.delete_if { |d| d<waycreated }


@@ -362,7 +418,7 @@ class AmfController < ApplicationController
       # Collect all in one nested array
       revdates.collect! {|d| [d.strftime("%d %b %Y, %H:%M:%S")] + revusers[d.to_i] }
 
       # Collect all in one nested array
       revdates.collect! {|d| [d.strftime("%d %b %Y, %H:%M:%S")] + revusers[d.to_i] }
 

-      return ['way',wayid,revdates]
+      return ['way', wayid, revdates]

     rescue ActiveRecord::RecordNotFound
       return ['way', wayid, []]
     end
     rescue ActiveRecord::RecordNotFound
       return ['way', wayid, []]
     end


@@ -392,39 +448,41 @@ class AmfController < ApplicationController
   # Returns array listing GPXs, each one comprising id, name and description.
   
   def findgpx(searchterm, usertoken)
   # Returns array listing GPXs, each one comprising id, name and description.
   
   def findgpx(searchterm, usertoken)

-    user = getuser(usertoken)
-    if !uid then return -1,"You must be logged in to search for GPX traces." end
-
-    gpxs = []
-    if searchterm.to_i>0 then
-      gpx = Trace.find(searchterm.to_i, :conditions => ["visible=? AND (public=? OR user_id=?)",true,true,user.id] )
-      if gpx then
-        gpxs.push([gpx.id, gpx.name, gpx.description])
+    amf_handle_error_with_timeout("'findgpx'") do
+      user = getuser(usertoken)
+      if !uid then return -1,"You must be logged in to search for GPX traces.",[] end
+
+      gpxs = []
+      if searchterm.to_i>0 then
+        gpx = Trace.find(searchterm.to_i, :conditions => ["visible=? AND (public=? OR user_id=?)",true,true,user.id] )
+        if gpx then
+          gpxs.push([gpx.id, gpx.name, gpx.description])
+        end
+      else
+        Trace.find(:all, :limit => 21, :conditions => ["visible=? AND (public=? OR user_id=?) AND MATCH(name) AGAINST (?)",true,true,user.id,searchterm] ).each do |gpx|
+          gpxs.push([gpx.id, gpx.name, gpx.description])
+        end

       end
       end

-    else
-      Trace.find(:all, :limit => 21, :conditions => ["visible=? AND (public=? OR user_id=?) AND MATCH(name) AGAINST (?)",true,true,user.id,searchterm] ).each do |gpx|
-      gpxs.push([gpx.id, gpx.name, gpx.description])
-         end
-       end
-    gpxs
+      [0,'',gpxs]
+    end

   end
 
   # Get a relation with all tags and members.
   # Returns:
   end
 
   # Get a relation with all tags and members.
   # Returns:

-  # 0. relation id,
-  # 1. hash of tags,
-  # 2. list of members,
-  # 3. version.
+  # 0. success code?
+  # 1. object type?
+  # 2. relation id,
+  # 3. hash of tags,
+  # 4. list of members,
+  # 5. version.

   
   def getrelation(relid) #:doc:
   
   def getrelation(relid) #:doc:

-    begin
-      rel = Relation.find(relid)
-    rescue ActiveRecord::RecordNotFound
-      return [relid, {}, []]
-    end
+    amf_handle_error("'getrelation' #{relid}") do
+      rel = Relation.find(:first, :conditions => { :id => relid })

 
 

-    return [relid, {}, [], nil] if rel.nil? or !rel.visible
-    [relid, rel.tags, rel.members, rel.version]
+      return [-4, 'relation', relid, {}, [], nil] if rel.nil? or !rel.visible
+      [0, '', relid, rel.tags, rel.members, rel.version]
+    end

   end
 
   # Find relations with specified name/id.
   end
 
   # Find relations with specified name/id.


@@ -435,15 +493,15 @@ class AmfController < ApplicationController
     if searchterm.to_i>0 then
       rel = Relation.find(searchterm.to_i)
       if rel and rel.visible then
     if searchterm.to_i>0 then
       rel = Relation.find(searchterm.to_i)
       if rel and rel.visible then

-        rels.push([rel.id, rel.tags, rel.members])
+        rels.push([rel.id, rel.tags, rel.members, rel.version])

       end
     else
       end
     else

-      RelationTag.find(:all, :limit => 11, :conditions => ["match(v) against (?)", searchterm] ).each do |t|
-      if t.relation.visible then
-             rels.push([t.relation.id, t.relation.tags, t.relation.members])
-           end
-         end
-       end
+      RelationTag.find(:all, :limit => 11, :conditions => ["v like ?", "%#{searchterm}%"] ).each do |t|
+        if t.relation.visible then
+          rels.push([t.relation.id, t.relation.tags, t.relation.members, t.relation.version])
+        end
+      end
+    end

     rels
   end
 
     rels
   end
 


@@ -451,75 +509,67 @@ class AmfController < ApplicationController
   # Returns
   # 0. 0 (success),
   # 1. original relation id (unchanged),
   # Returns
   # 0. 0 (success),
   # 1. original relation id (unchanged),

-  # 2. new relation id.
+  # 2. new relation id,
+  # 3. version.

 
   def putrelation(renumberednodes, renumberedways, usertoken, changeset_id, version, relid, tags, members, visible) #:doc:
 
   def putrelation(renumberednodes, renumberedways, usertoken, changeset_id, version, relid, tags, members, visible) #:doc:

-    user = getuser(usertoken)
-    if !user then return -1,"You are not logged in, so the relation could not be saved." end
-
-    relid = relid.to_i
-    visible = (visible.to_i != 0)
-
-    new_relation = nil
-    relation = nil
-    Relation.transaction do
-      # create a new relation, or find the existing one
-      if relid > 0
-        relation = Relation.find(relid)
-      end
-      # We always need a new node, based on the data that has been sent to us
-      new_relation = Relation.new
-
-      # check the members are all positive, and correctly type
-      typedmembers = []
-      members.each do |m|
-        mid = m[1].to_i
-        if mid < 0
-          mid = renumberednodes[mid] if m[0] == 'node'
-          mid = renumberedways[mid] if m[0] == 'way'
+    amf_handle_error("'putrelation' #{relid}")  do
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so the relation could not be saved." end
+
+      relid = relid.to_i
+      visible = (visible.to_i != 0)
+
+      new_relation = nil
+      relation = nil
+      Relation.transaction do
+        # create a new relation, or find the existing one
+        if relid > 0
+          relation = Relation.find(relid)

         end
         end

-        if mid
-          typedmembers << [m[0], mid, m[2]]
+        # We always need a new node, based on the data that has been sent to us
+        new_relation = Relation.new
+
+        # check the members are all positive, and correctly type
+        typedmembers = []
+        members.each do |m|
+          mid = m[1].to_i
+          if mid < 0
+            mid = renumberednodes[mid] if m[0] == 'Node'
+            mid = renumberedways[mid] if m[0] == 'Way'
+          end
+          if mid
+            typedmembers << [m[0], mid, m[2]]
+          end

         end
         end

-      end
-
-      # assign new contents
-      new_relation.members = typedmembers
-      new_relation.tags = tags
-      new_relation.visible = visible
-      new_relation.changeset_id = changeset_id
-      new_relation.version = version
-

 
 

-      if id <= 0
-        # We're creating the node
-        new_relation.create_with_history(user)
-      elsif visible
-        # We're updating the node
-        relation.update_from(new_relation, user)
+        # assign new contents
+        new_relation.members = typedmembers
+        new_relation.tags = tags
+        new_relation.visible = visible
+        new_relation.changeset_id = changeset_id
+        new_relation.version = version
+
+        if relid <= 0
+          # We're creating the relation
+          new_relation.create_with_history(user)
+        elsif visible
+          # We're updating the relation
+          new_relation.id = relid
+          relation.update_from(new_relation, user)
+        else
+          # We're deleting the relation
+          new_relation.id = relid
+          relation.delete_with_history!(new_relation, user)
+        end
+      end # transaction
+      
+      if relid <= 0
+        return [0, '', relid, new_relation.id, new_relation.version]

       else
       else

-        # We're deleting the node
-        relation.delete_with_history!(new_relation, user)
+        return [0, '', relid, relid, relation.version]

       end
       end

-    end # transaction
-      
-    if id <= 0
-      return [0, relid, new_relation.id, new_relation.version]
-    else
-      return [0, relid, relation.id, relation.version]
-    end
-  rescue OSM::APIChangesetAlreadyClosedError => ex
-    return [-1, "The changeset #{ex.changeset.id} was closed at #{ex.changeset.closed_at}."]
-  rescue OSM::APIVersionMismatchError => ex
-    # Really need to check to see whether this is a server load issue, and the 
-    # last version was in the same changeset, or belongs to the same user, then
-    # we can return something different
-    return [-3, "Sorry, someone else has changed this relation since you started editing. Please click the 'Edit' tab to reload the area."]
-  rescue OSM::APIAlreadyDeletedError => ex
-    return [-1, "The relation has already been deleted."]
-  rescue OSM::APIError => ex
-    # Some error that we don't specifically catch
-    return [-2, "Something really bad happened :-( ."]
+   end

   end
 
   # Save a way to the database, including all nodes. Any nodes in the previous
   end
 
   # Save a way to the database, including all nodes. Any nodes in the previous


@@ -533,7 +583,8 @@ class AmfController < ApplicationController
   # 4. way ID
   # 5. list of nodes in way
   # 6. hash of way tags
   # 4. way ID
   # 5. list of nodes in way
   # 6. hash of way tags

-  # 7. array of nodes to change (each one is [lon,lat,id,version,tags])
+  # 7. array of nodes to change (each one is [lon,lat,id,version,tags]),
+  # 8. hash of nodes to delete (id->version).

   # 
   # Returns:
   # 0. '0' (code for success),
   # 
   # Returns:
   # 0. '0' (code for success),


@@ -543,192 +594,175 @@ class AmfController < ApplicationController
   # 4. way version,
   # 5. hash of node versions (node=>version)
 
   # 4. way version,
   # 5. hash of node versions (node=>version)
 

-  def putway(renumberednodes, usertoken, changeset_id, wayversion, originalway, pointlist, attributes, nodes) #:doc:
-
-    # -- Initialise
+  def putway(renumberednodes, usertoken, changeset_id, wayversion, originalway, pointlist, attributes, nodes, deletednodes) #:doc:
+    amf_handle_error("'putway' #{originalway}") do
+      # -- Initialise

        
        

-    user = getuser(usertoken)
-    if !user then return -1,"You are not logged in, so the way could not be saved." end
-    if pointlist.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
-
-    originalway = originalway.to_i
-       pointlist.collect! {|a| a.to_i }
-
-    way=nil    # this is returned, so scope it outside the transaction
-    nodeversions = {}
-    Way.transaction do
-
-      # -- Get unique nodes
-
-      if originalway <= 0
-        uniques = []
-      else
-        way = Way.find(originalway)
-        uniques = way.unshared_node_ids
-      end
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so the way could not be saved." end
+      if pointlist.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
+
+      originalway = originalway.to_i
+      pointlist.collect! {|a| a.to_i }
+
+      way=nil  # this is returned, so scope it outside the transaction
+      nodeversions = {}
+      Way.transaction do
+
+        # -- Update each changed node
+
+        nodes.each do |a|
+          lon = a[0].to_f
+          lat = a[1].to_f
+          id = a[2].to_i
+          version = a[3].to_i
+          if id == 0  then return -2,"Server error - node with id 0 found in way #{originalway}." end
+          if lat== 90 then return -2,"Server error - node with latitude -90 found in way #{originalway}." end
+          if renumberednodes[id] then id = renumberednodes[id] end
+
+          node = Node.new
+          node.changeset_id = changeset_id
+          node.lat = lat
+          node.lon = lon
+          node.tags = a[4]
+          node.tags.delete('created_by')
+          node.version = version
+          if id <= 0
+            # We're creating the node
+            node.create_with_history(user)
+            renumberednodes[id] = node.id
+            nodeversions[node.id] = node.version
+          else
+            # We're updating an existing node
+            previous=Node.find(id)
+            node.id=id
+            previous.update_from(node, user)
+            nodeversions[previous.id] = previous.version
+          end
+        end

 
 

-      #-- Update each changed node
-
-      nodes.each do |a|
-        lon = a[0].to_f
-        lat = a[1].to_f
-        id = a[2].to_i
-        version = a[3].to_i
-        if id == 0  then return -2,"Server error - node with id 0 found in way #{originalway}." end
-        if lat== 90 then return -2,"Server error - node with latitude -90 found in way #{originalway}." end
-        if renumberednodes[id] then id = renumberednodes[id] end
-
-        node = Node.new
-        node.changeset_id = changeset_id
-        node.lat = lat
-        node.lon = lon
-        node.tags = a[4]
-        node.tags.delete('created_by')
-        node.version = version
-        if id <= 0
-          # We're creating the node
-          node.create_with_history(user)
-          renumberednodes[id] = node.id
-          nodeversions[node.id] = node.version
+        # -- Save revised way
+
+        pointlist.collect! {|a|
+          renumberednodes[a] ? renumberednodes[a]:a
+        } # renumber nodes
+        new_way = Way.new
+        new_way.tags = attributes
+        new_way.nds = pointlist
+        new_way.changeset_id = changeset_id
+        new_way.version = wayversion
+        if originalway <= 0
+          new_way.create_with_history(user)
+          way=new_way  # so we can get way.id and way.version

         else
         else

-          # We're updating an existing node
-          previous=Node.find(id)
-          previous.update_from(node, user)
-          nodeversions[previous.id] = previous.version
+          way = Way.find(originalway)
+          if way.tags!=attributes or way.nds!=pointlist or !way.visible?
+            new_way.id=originalway
+          way.update_from(new_way, user)
+          end

         end
         end

-      end
-
-      # -- Save revised way
-
-         pointlist.collect! {|a|
-               renumberednodes[a] ? renumberednodes[a]:a
-         } # renumber nodes
-      new_way = Way.new
-      new_way.tags = attributes
-      new_way.nds = pointlist
-      new_way.changeset_id = changeset_id
-      new_way.version = wayversion
-      if originalway <= 0
-        new_way.create_with_history(user)
-        way=new_way    # so we can get way.id and way.version
-      elsif way.tags!=attributes or way.nds!=pointlist or !way.visible?
-        way.update_from(new_way, user)
-      end
-
-      # -- Delete any unique nodes no longer used

 
 

-      uniques=uniques-pointlist
-      uniques.each do |n|
-        node = Node.find(n)
-        deleteitemrelations(user, changeset_id, id, 'node', node.version)
-        new_node = Node.new
-        new_node.changeset_id = changeset_id
-        new_node.version = node.version
-        node.delete_with_history!(new_node, user)
-      end
+        # -- Delete unwanted nodes
+
+        deletednodes.each do |id,v|
+          node = Node.find(id.to_i)
+          new_node = Node.new
+          new_node.changeset_id = changeset_id
+          new_node.version = v.to_i
+          new_node.id = id.to_i
+          begin
+            node.delete_with_history!(new_node, user)
+          rescue OSM::APIPreconditionFailedError => ex
+            # We don't do anything here as the node is being used elsewhere
+            # and we don't want to delete it
+          end
+        end

 
 

-    end # transaction
+      end # transaction

 
 

-    [0, originalway, way.id, renumberednodes, way.version, nodeversions]
-  rescue OSM::APIChangesetAlreadyClosedError => ex
-    return [-2, "Sorry, your changeset #{ex.changeset.id} has been closed (at #{ex.changeset.closed_at})."]
-  rescue OSM::APIVersionMismatchError => ex
-    # Really need to check to see whether this is a server load issue, and the 
-    # last version was in the same changeset, or belongs to the same user, then
-    # we can return something different
-    return [-3, "Sorry, someone else has changed this way since you started editing. Please click the 'Edit' tab to reload the area."]
-  rescue OSM::APITooManyWayNodesError => ex
-    return [-1, "You have tried to upload a really long way with #{ex.provided} points: only #{ex.max} are allowed."]
-  rescue OSM::APIAlreadyDeletedError => ex
-    return [-1, "The point has already been deleted."]
-  rescue OSM::APIError => ex
-    # Some error that we don't specifically catch
-    return [-2, "Something really bad happened :-(."]
+      [0, '', originalway, way.id, renumberednodes, way.version, nodeversions, deletednodes]
+    end

   end
 
   # Save POI to the database.
   # Refuses save if the node has since become part of a way.
   # Returns array with:
   # 0. 0 (success),
   end
 
   # Save POI to the database.
   # Refuses save if the node has since become part of a way.
   # Returns array with:
   # 0. 0 (success),

-  # 1. original node id (unchanged),
-  # 2. new node id,
-  # 3. version.
+  # 1. success message,
+  # 2. original node id (unchanged),
+  # 3. new node id,
+  # 4. version.

 
   def putpoi(usertoken, changeset_id, version, id, lon, lat, tags, visible) #:doc:
 
   def putpoi(usertoken, changeset_id, version, id, lon, lat, tags, visible) #:doc:

-    user = getuser(usertoken)
-    if !user then return -1,"You are not logged in, so the point could not be saved." end
-
-    id = id.to_i
-    visible = (visible.to_i == 1)
-    node = nil
-    new_node = nil
-    Node.transaction do
-      if id > 0 then
-        node = Node.find(id)
-
-        if !visible then
-          unless node.ways.empty? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end
+    amf_handle_error("'putpoi' #{id}") do
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so the point could not be saved." end
+
+      id = id.to_i
+      visible = (visible.to_i == 1)
+      node = nil
+      new_node = nil
+      Node.transaction do
+        if id > 0 then
+          node = Node.find(id)
+
+          if !visible then
+            unless node.ways.empty? then return -1,"The point has since become part of a way, so you cannot save it as a POI.",id,id,version end
+          end

         end
         end

-      end
-      # We always need a new node, based on the data that has been sent to us
-      new_node = Node.new
-
-      new_node.changeset_id = changeset_id
-      new_node.version = version
-      new_node.lat = lat
-      new_node.lon = lon
-      new_node.tags = tags
-      if id <= 0 
-        # We're creating the node
-        new_node.create_with_history(user)
-      elsif visible
-        # We're updating the node
-        node.update_from(new_node, user)
-      else
-        # We're deleting the node
-        node.delete_with_history!(new_node, user)
-      end
-     end # transaction
+        # We always need a new node, based on the data that has been sent to us
+        new_node = Node.new

 
 

-    if id <= 0
-      return [0, id, new_node.id, new_node.version]
-    else
-      return [0, id, node.id, node.version]
-    end 
-  rescue OSM::APIChangesetAlreadyClosedError => ex
-    return [-1, "The changeset #{ex.changeset.id} was closed at #{ex.changeset.closed_at}"]
-  rescue OSM::APIVersionMismatchError => ex
-    # Really need to check to see whether this is a server load issue, and the 
-    # last version was in the same changeset, or belongs to the same user, then
-    # we can return something different
-    return [-3, "Sorry, someone else has changed this point since you started editing. Please click the 'Edit' tab to reload the area."]
-  rescue OSM::APIAlreadyDeletedError => ex
-    return [-1, "The point has already been deleted"]
-  rescue OSM::APIError => ex
-    # Some error that we don't specifically catch
-    return [-2, "Something really bad happened :-()"]
+        new_node.changeset_id = changeset_id
+        new_node.version = version
+        new_node.lat = lat
+        new_node.lon = lon
+        new_node.tags = tags
+        if id <= 0 
+          # We're creating the node
+          new_node.create_with_history(user)
+        elsif visible
+          # We're updating the node
+          new_node.id=id
+          node.update_from(new_node, user)
+        else
+          # We're deleting the node
+          new_node.id=id
+          node.delete_with_history!(new_node, user)
+        end
+
+      end # transaction
+
+      if id <= 0
+        return [0, '', id, new_node.id, new_node.version]
+      else
+        return [0, '', id, node.id, node.version]
+      end 
+    end

   end
 
   # Read POI from database
   # (only called on revert: POIs are usually read by whichways).
   #
   end
 
   # Read POI from database
   # (only called on revert: POIs are usually read by whichways).
   #

-  # Returns array of id, long, lat, hash of tags, version.
+  # Returns array of id, long, lat, hash of tags, (current) version.

 
   def getpoi(id,timestamp) #:doc:
 
   def getpoi(id,timestamp) #:doc:

-    if timestamp == '' then
+    amf_handle_error("'getpoi' #{id}") do

       n = Node.find(id)
       n = Node.find(id)

-    else
-      n = OldNode.find(id, :conditions=>['timestamp=?',DateTime.strptime(timestamp, "%d %b %Y, %H:%M:%S")])
-    end
+      v = n.version
+      unless timestamp == ''
+        n = OldNode.find(id, :conditions=>['timestamp=?',DateTime.strptime(timestamp, "%d %b %Y, %H:%M:%S")])
+      end

 
 

-    if n
-      return [n.id, n.lon, n.lat, n.tags, n.version]
-    else
-      return [nil, nil, nil, {}, nil]
+      if n
+        return [0, '', n.id, n.lon, n.lat, n.tags, v]
+      else
+        return [-4, 'node', id, nil, nil, {}, nil]
+      end

     end
   end
 
     end
   end
 

-  # Delete way and all constituent nodes. Also removes from any relations.
+  # Delete way and all constituent nodes.

   # Params:
   # * The user token
   # * the changeset id
   # Params:
   # * The user token
   # * the changeset id


@@ -736,80 +770,54 @@ class AmfController < ApplicationController
   # * the version of the way that was downloaded
   # * a hash of the id and versions of all the nodes that are in the way, if any 
   # of the nodes have been changed by someone else then, there is a problem!
   # * the version of the way that was downloaded
   # * a hash of the id and versions of all the nodes that are in the way, if any 
   # of the nodes have been changed by someone else then, there is a problem!

-  # Returns 0 (success), unchanged way id.
+  # Returns 0 (success), unchanged way id, new way version, new node versions.

 
 

-  def deleteway(usertoken, changeset_id, way_id, way_version, node_id_version) #:doc:
-    user = getuser(usertoken)
-    unless user then return -1,"You are not logged in, so the way could not be deleted." end
+  def deleteway(usertoken, changeset_id, way_id, way_version, deletednodes) #:doc:
+    amf_handle_error("'deleteway' #{way_id}") do
+      user = getuser(usertoken)
+      unless user then return -1,"You are not logged in, so the way could not be deleted." end

       
       

-    way_id = way_id.to_i
-    # Need a transaction so that if one item fails to delete, the whole delete fails.
-    Way.transaction do
-
-      # delete the way
-      old_way = Way.find(way_id)
-      delete_way = Way.new
-      delete_way.version = way_version
-      delete_way.changeset_id = changeset_id
-      old_way.delete_with_history!(delete_way, user)
-
-      old_way.unshared_node_ids.each do |node_id|
-        # delete the node
-        node = Node.find(node_id)
-        delete_node = Node.new
-        delete_node.changeset_id = changeset_id
-        if node_id_version[node_id.to_s]
-          delete_node.version = node_id_version[node_id.to_s]
-        else
-          # in case the node wasn't passed (i.e. if it was previously removed
-          # from the way in Potlatch)
-          deleteitemrelations(user, changeset_id, node_id, 'node', node.version)
-             delete_node.version = node.version
-           end
-        node.delete_with_history!(delete_node, user)
-      end
-    end # transaction
-    [0, way_id]
-  rescue OSM::APIChangesetAlreadyClosedError => ex
-    return [-1, "The changeset #{ex.changeset.id} was closed at #{ex.changeset.closed_at}"]
-  rescue OSM::APIVersionMismatchError => ex
-    # Really need to check to see whether this is a server load issue, and the 
-    # last version was in the same changeset, or belongs to the same user, then
-    # we can return something different
-    return [-3, "Sorry, someone else has changed this way since you started editing. Please click the 'Edit' tab to reload the area."]
-  rescue OSM::APIAlreadyDeletedError => ex
-    return [-1, "The way has already been deleted."]
-  rescue OSM::APIError => ex
-    # Some error that we don't specifically catch
-    return [-2, "Something really bad happened :-( ."]
+      way_id = way_id.to_i
+      nodeversions = {}
+      old_way=nil # returned, so scope it outside the transaction
+      # Need a transaction so that if one item fails to delete, the whole delete fails.
+      Way.transaction do
+
+        # -- Delete the way
+
+        old_way = Way.find(way_id)
+        delete_way = Way.new
+        delete_way.version = way_version
+        delete_way.changeset_id = changeset_id
+        delete_way.id = way_id
+        old_way.delete_with_history!(delete_way, user)
+
+        # -- Delete unwanted nodes
+
+        deletednodes.each do |id,v|
+          node = Node.find(id.to_i)
+          new_node = Node.new
+          new_node.changeset_id = changeset_id
+          new_node.version = v.to_i
+          new_node.id = id.to_i
+          begin
+            node.delete_with_history!(new_node, user)
+            nodeversions[node.id]=node.version
+          rescue OSM::APIPreconditionFailedError => ex
+            # We don't do anything with the exception as the node is in use
+            # elsewhere and we don't want to delete it
+          end
+        end
+
+      end # transaction
+      [0, '', way_id, old_way.version, nodeversions]
+    end

   end
 
 
   # ====================================================================
   # Support functions
 
   end
 
 
   # ====================================================================
   # Support functions
 

-  # Remove a node or way from all relations
-  # This is only used by putway and deleteway when deleting nodes removed 
-  # from a way (because Potlatch itself doesn't keep track of these - 
-  # possible FIXME).
-
-  def deleteitemrelations(user, changeset_id, objid, type, version) #:doc:
-    relations = RelationMember.find(:all, 
-                                                                       :conditions => ['member_type = ? and member_id = ?', type, objid], 
-                                                                       :include => :relation).collect { |rm| rm.relation }.uniq
-
-    relations.each do |rel|
-      rel.members.delete_if { |x| x[0] == type and x[1] == objid }
-      new_rel = Relation.new
-      new_rel.tags = rel.tags
-      new_rel.visible = rel.visible
-      new_rel.version = rel.version
-      new_rel.members = rel.members
-      new_rel.changeset_id = changeset_id
-      rel.update_from(new_rel, user)
-    end
-  end
-

   # Authenticate token
   # (can also be of form user:pass)
   # When we are writing to the api, we need the actual user model, 
   # Authenticate token
   # (can also be of form user:pass)
   # When we are writing to the api, we need the actual user model, 


@@ -883,7 +891,7 @@ class AmfController < ApplicationController
       SELECT DISTINCT cr.id AS relid,cr.version AS version 
       FROM current_relations cr
       INNER JOIN current_relation_members crm ON crm.id=cr.id 
       SELECT DISTINCT cr.id AS relid,cr.version AS version 
       FROM current_relations cr
       INNER JOIN current_relation_members crm ON crm.id=cr.id 

-      INNER JOIN current_nodes cn ON crm.member_id=cn.id AND crm.member_type='node' 
+      INNER JOIN current_nodes cn ON crm.member_id=cn.id AND crm.member_type='Node' 

        WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "cn.")}
       EOF
     unless way_ids.empty?
        WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "cn.")}
       EOF
     unless way_ids.empty?


@@ -892,17 +900,17 @@ class AmfController < ApplicationController
         SELECT DISTINCT cr.id AS relid,cr.version AS version
         FROM current_relations cr
         INNER JOIN current_relation_members crm ON crm.id=cr.id
         SELECT DISTINCT cr.id AS relid,cr.version AS version
         FROM current_relations cr
         INNER JOIN current_relation_members crm ON crm.id=cr.id

-         WHERE crm.member_type='way' 
+         WHERE crm.member_type='Way' 

          AND crm.member_id IN (#{way_ids.join(',')})
         EOF
     end
          AND crm.member_id IN (#{way_ids.join(',')})
         EOF
     end

-    return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['relid'].to_i,a['version'].to_i] }
+    ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['relid'].to_i,a['version'].to_i] }

   end
        
   def sql_get_nodes_in_way(wayid)
     points=[]
     sql=<<-EOF
   end
        
   def sql_get_nodes_in_way(wayid)
     points=[]
     sql=<<-EOF

-      SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,current_nodes.id 
+      SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,current_nodes.id,current_nodes.version 

       FROM current_way_nodes,current_nodes 
        WHERE current_way_nodes.id=#{wayid.to_i} 
                   AND current_way_nodes.node_id=current_nodes.id 
       FROM current_way_nodes,current_nodes 
        WHERE current_way_nodes.id=#{wayid.to_i} 
                   AND current_way_nodes.node_id=current_nodes.id 


@@ -915,7 +923,7 @@ class AmfController < ApplicationController
         nodetags[n['k']]=n['v']
       end
       nodetags.delete('created_by')
         nodetags[n['k']]=n['v']
       end
       nodetags.delete('created_by')

-      points << [row['lon'].to_f,row['lat'].to_f,row['id'].to_i,nodetags]
+      points << [row['lon'].to_f,row['lat'].to_f,row['id'].to_i,nodetags,row['version'].to_i]

     end
     points
   end
     end
     points
   end