X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/02fbcf5f06917d7dea546b90932da82b8ed29d2a..19854d936dc3a60cbc439b18251bae5ec58ee7b5:/app/models/changeset.rb diff --git a/app/models/changeset.rb b/app/models/changeset.rb index b00dfa8af..f23a4e356 100644 --- a/app/models/changeset.rb +++ b/app/models/changeset.rb @@ -1,170 +1,215 @@ -class Changeset < ActiveRecord::Base - require 'xml/libxml' +# == Schema Information +# +# Table name: changesets +# +# id :bigint(8) not null, primary key +# user_id :bigint(8) not null +# created_at :datetime not null +# min_lat :integer +# max_lat :integer +# min_lon :integer +# max_lon :integer +# closed_at :datetime not null +# num_changes :integer default(0), not null +# +# Indexes +# +# changesets_bbox_idx (min_lat,max_lat,min_lon,max_lon) USING gist +# changesets_closed_at_idx (closed_at) +# changesets_created_at_idx (created_at) +# changesets_user_id_created_at_idx (user_id,created_at) +# changesets_user_id_id_idx (user_id,id) +# +# Foreign Keys +# +# changesets_user_id_fkey (user_id => users.id) +# + +class Changeset < ApplicationRecord + require "xml/libxml" + + belongs_to :user, :counter_cache => true + + has_many :changeset_tags - belongs_to :user - - has_many :changeset_tags, :foreign_key => 'id' - has_many :nodes has_many :ways has_many :relations has_many :old_nodes has_many :old_ways has_many :old_relations - - validates_presence_of :user_id, :created_at - validates_inclusion_of :open, :in => [ true, false ] - - # over-expansion factor to use when updating the bounding box - EXPAND = 0.1 + + 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, :only_integer => true } + validates :num_changes, :presence => true, + :numericality => { :only_integer => 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 => { :only_integer => true } + + before_save :update_closed_at + + # maximum number of elements allowed in a changeset + MAX_ELEMENTS = 10000 + + # 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 + # determine whether a changeset is open, without breaking code in at # least 6 controllers - def is_open? - return open + def 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.utc) && (num_changes <= MAX_ELEMENTS)) end - def self.from_xml(xml, create=false) - begin - p = XML::Parser.new - p.string = xml - doc = p.parse + def set_closed_time_now + self.closed_at = Time.now.utc if open? + end - cs = Changeset.new + def self.from_xml(xml, create: false) + p = XML::Parser.string(xml, :options => XML::Parser::Options::NOERROR) + doc = p.parse + pt = doc.find_first("//osm/changeset") - doc.find('//osm/changeset').each do |pt| - if create - cs.created_at = Time.now - end + if pt + Changeset.from_xml_node(pt, :create => create) + else + raise OSM::APIBadXMLError.new("changeset", xml, "XML doesn't contain an osm/changeset element.") + end + rescue LibXML::XML::Error, ArgumentError => e + raise OSM::APIBadXMLError.new("changeset", xml, e.message) + end - pt.find('tag').each do |tag| - cs.add_tag_keyval(tag['k'], tag['v']) - end - end - rescue Exception => ex - cs = nil + def self.from_xml_node(pt, create: false) + cs = Changeset.new + if create + cs.created_at = Time.now.utc + # 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| + raise OSM::APIBadXMLError.new("changeset", pt, "tag is missing key") if tag["k"].nil? + raise 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 ||= [ min_lon, min_lat, max_lon, max_lat ] + @bbox ||= BoundingBox.new(min_lon, min_lat, max_lon, max_lat) + end + + def bbox_valid? + 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!(array) - # ensure that bbox is cached and has no nils in it. if there are any - # nils, just use the bounding box update to write over them. - @bbox = bbox.zip(array).collect { |a, b| a.nil? ? b : a } - - # FIXME - this looks nasty and violates DRY... is there any prettier - # way to do this? - @bbox[0] = array[0] + EXPAND * (@bbox[0] - @bbox[2]) if array[0] < @bbox[0] - @bbox[1] = array[1] + EXPAND * (@bbox[1] - @bbox[3]) if array[1] < @bbox[1] - @bbox[2] = array[2] + EXPAND * (@bbox[2] - @bbox[0]) if array[2] > @bbox[2] - @bbox[3] = array[3] + EXPAND * (@bbox[3] - @bbox[1]) if array[3] > @bbox[3] + # expand the bounding box to include the given bounding box. + def update_bbox!(bbox_update) + bbox.expand!(bbox_update) # 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 + self.min_lon, self.min_lat, self.max_lon, self.max_lat = @bbox.to_a.collect(&:round) if bbox.complete? end - def tags_as_hash - return tags + ## + # the number of elements is also passed in so that we can ensure that + # a single changeset doesn't contain too many elements. + 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 ||= {} + + # duplicate tags are now forbidden, so we can't allow values + # in the hash to be overwritten. + raise 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? - # FIXME there is no modified_at time, should it be added - self.save! - end + save! - ChangesetTag.transaction do tags = self.tags - ChangesetTag.delete_all(['id = ?', self.id]) + ChangesetTag.where(:changeset_id => id).delete_all - 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 - doc = OSM::API.new.get_xml_doc - doc.root << to_xml_node() - return doc + + ## + # 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 open? + self.closed_at = if (closed_at - created_at) > (MAX_TIME_OPEN - IDLE_TIMEOUT) + created_at + MAX_TIME_OPEN + else + Time.now.utc + IDLE_TIMEOUT + end + end end - - def to_xml_node(user_display_name_cache = nil) - el1 = XML::Node.new 'changeset' - el1['id'] = self.id.to_s - user_display_name_cache = {} if user_display_name_cache.nil? + ## + # 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. + raise OSM::APIUserChangesetMismatchError unless user.id == user_id - if user_display_name_cache and user_display_name_cache.key?(self.user_id) - # use the cache if available - elsif self.user.data_public? - user_display_name_cache[self.user_id] = self.user.display_name - else - user_display_name_cache[self.user_id] = nil - end + # can't change a closed changeset + raise OSM::APIChangesetAlreadyClosedError, self unless open? - el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil? + # copy the other's tags + self.tags = other.tags - self.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 - - el1['min_lon'] = (bbox[0] / SCALE).to_s unless bbox[0].nil? - el1['min_lat'] = (bbox[1] / SCALE).to_s unless bbox[1].nil? - el1['max_lon'] = (bbox[2] / SCALE).to_s unless bbox[2].nil? - el1['max_lat'] = (bbox[3] / SCALE).to_s unless bbox[3].nil? - - # 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. - - return el1 + save_with_tags! end end