# amf_controller is a semi-standalone API for Flash clients, particularly # Potlatch. All interaction between Potlatch (as a .SWF application) and the # OSM database takes place using this controller. Messages are # encoded in the Actionscript Message Format (AMF). # # Helper functions are in /lib/potlatch.rb # # Author:: editions Systeme D / Richard Fairhurst 2004-2008 # Licence:: public domain. # # == General structure # # Apart from the amf_read and amf_write methods (which distribute the requests # from the AMF message), each method generally takes arguments in the order # they were sent by the Potlatch SWF. Do not assume typing has been preserved. # Methods all return an array to the SWF. # # == API 0.6 # # Note that this requires a patched version of composite_primary_keys 1.1.0 # (see http://groups.google.com/group/compositekeys/t/a00e7562b677e193) # if you are to run with POTLATCH_USE_SQL=false . # # == 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(-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"). # Remaining issues: # * version conflict when POIs and ways are reverted class AmfController < ApplicationController require 'stringio' include Potlatch # Help methods for checking boundary sanity and area size include MapBoundary 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 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 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}(#{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 logger.info("Encoding AMF results") sendresponse(results) else render :nothing => true, :status => :method_not_allowed end end def amf_write 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) 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 logger.info("Encoding AMF results") sendresponse(results) else render :nothing => true, :status => :method_not_allowed end 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 # Returns success_code,success_message,changeset id 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! return [0,'',cs.id] else return [0,'',nil] end end end # Return presets (default tags, localisation etc.): # uses POTLATCH_PRESETS global, set up in OSM::Potlatch. 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 ## # Find all the ways, POI nodes (i.e. not part of ways), and relations # in a given bounding box. Nodes are returned in full; ways and relations # are IDs only. # # return is of the form: # [success_code, success_message, # [[way_id, way_version], ...], # [[node_id, lat, lon, [tags, ...], node_version], ...], # [[rel_id, rel_version], ...]] # where the ways are any visible ways which refer to any visible # nodes in the bbox, nodes are any visible nodes in the bbox but not # 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: amf_handle_error_with_timeout("'whichways'") 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 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 [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: 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 check_boundaries(xmin, ymin, xmax, ymax) 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] 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: 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) else # 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 way = Way.find(:first, :conditions => { :id => wayid }, :include => { :nodes => :node_tags }) # check case where way has been deleted or doesn't exist return [-4, 'way', wayid, [], {}, nil] if way.nil? or !way.visible points = way.nodes.collect do |node| nodetags=node.tags nodetags.delete('created_by') [node.lon, node.lat, node.id, nodetags, node.version] end tags = way.tags version = way.version end [0, '', wayid, points, tags, version] 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, # even if it's moved. For revert (version >= 0), uses the node in existence # at the time, generating a new id if it's still visible and has been moved/ # retagged. # # Returns: # 0. success code, # 1. id, # 2. array of points, # 3. hash of tags, # 4. version, # 5. is this the current, visible version? (boolean) def getway_old(id, timestamp) #:doc: 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 rescue ArgumentError # thrown by date parsing method. leave old_way as nil for # the error handler below. end end 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 # Find history of a way. # Returns 'way', id, and an array of previous versions: # - formerly [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user, uid] # - now [timestamp,user,uid] # # Heuristic: Find all nodes that have ever been part of the way; # get a list of their revision dates; add revision dates of the way; # sort and collapse list (to within 2 seconds); trim all dates before the # start date of the way. def getway_history(wayid) #:doc: begin # Find list of revision dates for way and all constituent nodes revdates=[] revusers={} Way.find(wayid).old_ways.collect do |a| revdates.push(a.timestamp) unless revusers.has_key?(a.timestamp.to_i) then revusers[a.timestamp.to_i]=change_user(a) end a.nds.each do |n| Node.find(n).old_nodes.collect do |o| revdates.push(o.timestamp) unless revusers.has_key?(o.timestamp.to_i) then revusers[o.timestamp.to_i]=change_user(o) end end end end waycreated=revdates[0] revdates.uniq! revdates.sort! revdates.reverse! # Remove any dates (from nodes) before first revision date of way revdates.delete_if { |d| d0 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 [0,'',gpxs] end end # Get a relation with all tags and members. # Returns: # 0. success code? # 1. object type? # 2. relation id, # 3. hash of tags, # 4. list of members, # 5. version. def getrelation(relid) #:doc: amf_handle_error("'getrelation' #{relid}") do rel = Relation.find(:first, :conditions => { :id => relid }) 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. # Returns array of relations, each in same form as getrelation. def findrelations(searchterm) rels = [] 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, rel.version]) end else 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 # Save a relation. # Returns # 0. 0 (success), # 1. original relation id (unchanged), # 2. new relation id, # 3. version. def putrelation(renumberednodes, renumberedways, usertoken, changeset_id, version, relid, tags, members, visible) #:doc: 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 # 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 # 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 return [0, '', relid, relid, relation.version] end end end # Save a way to the database, including all nodes. Any nodes in the previous # version and no longer used are deleted. # # Parameters: # 0. hash of renumbered nodes (added by amf_controller) # 1. current user token (for authentication) # 2. current changeset # 3. new way version # 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]), # 8. hash of nodes to delete (id->version). # # Returns: # 0. '0' (code for success), # 1. original way id (unchanged), # 2. new way id, # 3. hash of renumbered nodes (old id=>new id), # 4. way version, # 5. hash of node versions (node=>version) 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 # -- 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 # -- 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 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 # -- 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 [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), # 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: 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 # 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 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). # # Returns array of id, long, lat, hash of tags, (current) version. def getpoi(id,timestamp) #:doc: amf_handle_error("'getpoi' #{id}") do n = Node.find(id) v = n.version unless timestamp == '' n = OldNode.find(id, :conditions=>['timestamp=?',DateTime.strptime(timestamp, "%d %b %Y, %H:%M:%S")]) end if n return [0, '', n.id, n.lon, n.lat, n.tags, v] else return [-4, 'node', id, nil, nil, {}, nil] end end end # Delete way and all constituent nodes. # Params: # * The user token # * the changeset id # * the id of the way to change # * 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, new way version, new node versions. 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 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 # Authenticate token # (can also be of form user:pass) # When we are writing to the api, we need the actual user model, # not just the id, hence this abstraction def getuser(token) #:doc: if (token =~ /^(.+)\:(.+)$/) then user = User.authenticate(:username => $1, :password => $2) else user = User.authenticate(:token => token) end return user end # Send AMF response def sendresponse(results) a,b=results.length.divmod(256) render :content_type => "application/x-amf", :text => proc { |response, output| # ** move amf writing loop into here - # basically we read the messages in first (into an array of some sort), # then iterate through that array within here, and do all the AMF writing output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr results.each do |k,v| output.write(v) end } end # ==================================================================== # Alternative SQL queries for getway/whichways def sql_find_ways_in_area(xmin,ymin,xmax,ymax) sql=<<-EOF SELECT DISTINCT current_ways.id AS wayid,current_ways.version AS version FROM current_way_nodes INNER JOIN current_nodes ON current_nodes.id=current_way_nodes.node_id INNER JOIN current_ways ON current_ways.id =current_way_nodes.id WHERE current_nodes.visible=TRUE AND current_ways.visible=TRUE AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")} EOF return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['wayid'].to_i,a['version'].to_i] } end def sql_find_pois_in_area(xmin,ymin,xmax,ymax) pois=[] sql=<<-EOF SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lon,current_nodes.version FROM current_nodes LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id WHERE current_nodes.visible=TRUE AND cwn.id IS NULL AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")} EOF ActiveRecord::Base.connection.select_all(sql).each do |row| poitags={} ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n| poitags[n['k']]=n['v'] end pois << [row['id'].to_i, row['lon'].to_f, row['lat'].to_f, poitags, row['version'].to_i] end pois end def sql_find_relations_in_area_and_ways(xmin,ymin,xmax,ymax,way_ids) # ** It would be more Potlatchy to get relations for nodes within ways # during 'getway', not here sql=<<-EOF 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' WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "cn.")} EOF unless way_ids.empty? sql+=<<-EOF UNION 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' AND crm.member_id IN (#{way_ids.join(',')}) EOF end 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 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 AND current_nodes.visible=TRUE ORDER BY sequence_id EOF ActiveRecord::Base.connection.select_all(sql).each do |row| nodetags={} ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n| nodetags[n['k']]=n['v'] end nodetags.delete('created_by') points << [row['lon'].to_f,row['lat'].to_f,row['id'].to_i,nodetags,row['version'].to_i] end points end def sql_get_tags_in_way(wayid) tags={} ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_way_tags WHERE id=#{wayid.to_i}").each do |row| tags[row['k']]=row['v'] end tags end def sql_get_way_version(wayid) ActiveRecord::Base.connection.select_one("SELECT version FROM current_ways WHERE id=#{wayid.to_i}") end end