X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/d9e070e06956801aba2378c1b79b4d9f13ae12ee..c7061991e74a20cc0576a3afa269821a87178f77:/app/models/changeset.rb diff --git a/app/models/changeset.rb b/app/models/changeset.rb index c9eeb0018..691081609 100644 --- a/app/models/changeset.rb +++ b/app/models/changeset.rb @@ -1,111 +1,254 @@ class Changeset < ActiveRecord::Base - require 'xml/libxml' - - belongs_to :user + require "xml/libxml" + + belongs_to :user, :counter_cache => true + + has_many :changeset_tags + + has_many :nodes + has_many :ways + has_many :relations + has_many :old_nodes + has_many :old_ways + has_many :old_relations + + has_many :comments, -> { where(:visible => true).order(:created_at) }, :class_name => "ChangesetComment" + has_and_belongs_to_many :subscribers, :class_name => "User", :join_table => "changesets_subscribers", :association_foreign_key => "subscriber_id" + + validates :id, :uniqueness => true, :presence => { :on => :update }, + :numericality => { :on => :update, :integer_only => true } + validates :user_id, :presence => true, + :numericality => { :integer_only => true } + validates :num_changes, :presence => true, + :numericality => { :integer_only => true, + :greater_than_or_equal_to => 0 } + validates :created_at, :closed_at, :presence => true + validates :min_lat, :max_lat, :min_lon, :max_lat, :allow_nil => true, + :numericality => { :integer_only => true } + + before_save :update_closed_at + + # over-expansion factor to use when updating the bounding box + EXPAND = 0.1 + + # maximum number of elements allowed in a changeset + MAX_ELEMENTS = 50000 + + # maximum time a changeset is allowed to be open for. + MAX_TIME_OPEN = 1.day + + # idle timeout increment, one hour seems reasonable. + IDLE_TIMEOUT = 1.hour + + # Use a method like this, so that we can easily change how we + # determine whether a changeset is open, without breaking code in at + # least 6 controllers + def is_open? + # a changeset is open (that is, it will accept further changes) when + # it has not yet run out of time and its capacity is small enough. + # note that this may not be a hard limit - due to timing changes and + # concurrency it is possible that some changesets may be slightly + # longer than strictly allowed or have slightly more changes in them. + ((closed_at > Time.now.getutc) && (num_changes <= MAX_ELEMENTS)) + end - has_many :changeset_tags, :foreign_key => 'id' + def set_closed_time_now + self.closed_at = Time.now.getutc if is_open? + end - def self.from_xml(xml, create=false) - begin - p = XML::Parser.new - p.string = xml - doc = p.parse + def self.from_xml(xml, create = false) + p = XML::Parser.string(xml, :options => XML::Parser::Options::NOERROR) + doc = p.parse - cs = Changeset.new + doc.find("//osm/changeset").each do |pt| + return Changeset.from_xml_node(pt, create) + end + fail OSM::APIBadXMLError.new("changeset", xml, "XML doesn't contain an osm/changeset element.") + rescue LibXML::XML::Error, ArgumentError => ex + raise OSM::APIBadXMLError.new("changeset", xml, ex.message) + end - doc.find('//osm/changeset').each do |pt| - if create - cs.created_at = Time.now - end + def self.from_xml_node(pt, create = false) + cs = Changeset.new + if create + cs.created_at = Time.now.getutc + # initial close time is 1h ahead, but will be increased on each + # modification. + cs.closed_at = cs.created_at + IDLE_TIMEOUT + # initially we have no changes in a changeset + cs.num_changes = 0 + end - pt.find('tag').each do |tag| - cs.add_tag_keyval(tag['k'], tag['v']) - end - end - rescue Exception => ex - print "noes "+ ex.to_s + "\n" - cs = nil + pt.find("tag").each do |tag| + fail OSM::APIBadXMLError.new("changeset", pt, "tag is missing key") if tag["k"].nil? + fail OSM::APIBadXMLError.new("changeset", pt, "tag is missing value") if tag["v"].nil? + cs.add_tag_keyval(tag["k"], tag["v"]) end - return cs + cs + end + + ## + # returns the bounding box of the changeset. it is possible that some + # or all of the values will be nil, indicating that they are undefined. + def bbox + @bbox ||= BoundingBox.new(min_lon, min_lat, max_lon, max_lat) + end + + def has_valid_bbox? + bbox.complete? + end + + ## + # expand the bounding box to include the given bounding box. also, + # expand a little bit more in the direction of the expansion, so that + # further expansions may be unnecessary. this is an optimisation + # suggested on the wiki page by kleptog. + def update_bbox!(bbox_update) + bbox.expand!(bbox_update, EXPAND) + + # update active record. rails 2.1's dirty handling should take care of + # whether this object needs saving or not. + self.min_lon, self.min_lat, self.max_lon, self.max_lat = @bbox.to_a if bbox.complete? + end + + ## + # the number of elements is also passed in so that we can ensure that + # a single changeset doesn't contain too many elements. this, of course, + # destroys the optimisation described in the bbox method above. + def add_changes!(elements) + self.num_changes += elements end def tags unless @tags @tags = {} - self.changeset_tags.each do |tag| + changeset_tags.each do |tag| @tags[tag.k] = tag.v end end @tags end - def tags=(t) - @tags = t - end + attr_writer :tags def add_tag_keyval(k, v) - @tags = Hash.new unless @tags + @tags = {} unless @tags + + # duplicate tags are now forbidden, so we can't allow values + # in the hash to be overwritten. + fail OSM::APIDuplicateTagsError.new("changeset", id, k) if @tags.include? k + @tags[k] = v end def save_with_tags! - t = Time.now - + # do the changeset update and the changeset tags update in the + # same transaction to ensure consistency. Changeset.transaction do - # fixme update modified_at time? - self.save! - end + save! - ChangesetTag.transaction do tags = self.tags - ChangesetTag.delete_all(['id = ?', self.id]) + ChangesetTag.delete_all(:changeset_id => id) - tags.each do |k,v| + tags.each do |k, v| tag = ChangesetTag.new + tag.changeset_id = id tag.k = k tag.v = v - tag.id = self.id tag.save! end end end - - def to_xml + + ## + # set the auto-close time to be one hour in the future unless + # that would make it more than 24h long, in which case clip to + # 24h, as this has been decided is a reasonable time limit. + def update_closed_at + if is_open? + self.closed_at = if (closed_at - created_at) > (MAX_TIME_OPEN - IDLE_TIMEOUT) + created_at + MAX_TIME_OPEN + else + Time.now.getutc + IDLE_TIMEOUT + end + end + end + + def to_xml(include_discussion = false) doc = OSM::API.new.get_xml_doc - doc.root << to_xml_node() - return doc + doc.root << to_xml_node(nil, include_discussion) + doc end - def to_xml_node(user_display_name_cache = nil) - el1 = XML::Node.new 'changeset' - el1['id'] = self.id.to_s + + def to_xml_node(user_display_name_cache = nil, include_discussion = false) + el1 = XML::Node.new "changeset" + el1["id"] = id.to_s user_display_name_cache = {} if user_display_name_cache.nil? - if user_display_name_cache and user_display_name_cache.key?(self.user_id) + if user_display_name_cache && user_display_name_cache.key?(user_id) # use the cache if available - elsif self.user.data_public? - user_display_name_cache[self.user_id] = self.user.display_name + elsif user.data_public? + user_display_name_cache[user_id] = user.display_name else - user_display_name_cache[self.user_id] = nil + user_display_name_cache[user_id] = nil end - el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil? + el1["user"] = user_display_name_cache[user_id] unless user_display_name_cache[user_id].nil? + el1["uid"] = user_id.to_s if user.data_public? - self.tags.each do |k,v| - el2 = XML::Node.new('tag') - el2['k'] = k.to_s - el2['v'] = v.to_s + tags.each do |k, v| + el2 = XML::Node.new("tag") + el2["k"] = k.to_s + el2["v"] = v.to_s el1 << el2 end - - el1['created_at'] = self.created_at.xmlschema - el1['open'] = self.open.to_s - # FIXME FIXME FIXME: This does not include changes yet! There is - # currently no changeset_id column in the tables as far as I can tell, - # so this is just a scaffold to build on, not a complete to_xml + el1["created_at"] = created_at.xmlschema + el1["closed_at"] = closed_at.xmlschema unless is_open? + el1["open"] = is_open?.to_s + + bbox.to_unscaled.add_bounds_to(el1, "_") if bbox.complete? + + el1["comments_count"] = comments.count.to_s + + if include_discussion + el2 = XML::Node.new("discussion") + comments.includes(:author).each do |comment| + el3 = XML::Node.new("comment") + el3["date"] = comment.created_at.xmlschema + el3["uid"] = comment.author.id.to_s if comment.author.data_public? + el3["user"] = comment.author.display_name.to_s if comment.author.data_public? + el4 = XML::Node.new("text") + el4.content = comment.body.to_s + el3 << el4 + el2 << el3 + end + el1 << el2 + end + + # NOTE: changesets don't include the XML of the changes within them, + # they are just structures for tagging. to get the osmChange of a + # changeset, see the download method of the controller. + + el1 + end + + ## + # update this instance from another instance given and the user who is + # doing the updating. note that this method is not for updating the + # bounding box, only the tags of the changeset. + def update_from(other, user) + # ensure that only the user who opened the changeset may modify it. + fail OSM::APIUserChangesetMismatchError.new unless user.id == user_id + + # can't change a closed changeset + fail OSM::APIChangesetAlreadyClosedError.new(self) unless is_open? + + # copy the other's tags + self.tags = other.tags - return el1 + save_with_tags! end end