X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/2b8bde9055f0cfdf7d261382cd40980d72bae188..f0764d3:/app/models/changeset.rb?ds=sidebyside diff --git a/app/models/changeset.rb b/app/models/changeset.rb index 0b214fe72..abb494de6 100644 --- a/app/models/changeset.rb +++ b/app/models/changeset.rb @@ -1,222 +1,200 @@ -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) +# index_changesets_on_user_id_and_closed_at (user_id,closed_at) +# +# 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 :id, :on => :update - validates_presence_of :user_id, :created_at, :closed_at, :num_changes - validates_uniqueness_of :id - validates_numericality_of :id, :on => :update, :integer_only => true - validates_numericality_of :min_lat, :max_lat, :min_lon, :max_lat, :allow_nil => true, :integer_only => true - validates_numericality_of :user_id, :integer_only => true - validates_numericality_of :num_changes, :integer_only => true, :greater_than_or_equal_to => 0 - validates_associated :user - - # 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 = 50000 + MAX_ELEMENTS = 10000 - # maximum time a changeset is allowed to be open for (note that this - # is in days - so one hour is Rational(1,24)). + # maximum time a changeset is allowed to be open for. MAX_TIME_OPEN = 1.day - # idle timeout increment, one hour as a rational number of days. - # NOTE: DO NOT CHANGE THIS TO 1.hour! when this was done the idle - # timeout changed to 1 second, which meant all changesets closed - # almost immediately. - IDLE_TIMEOUT = 1.hour # Rational(1,24) + # 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? + 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 + # concurrency it is possible that some changesets may be slightly # longer than strictly allowed or have slightly more changes in them. - return ((closed_at > DateTime.now) and (num_changes <= MAX_ELEMENTS)) + (closed_at > Time.now.utc) && (num_changes <= MAX_ELEMENTS) end def set_closed_time_now - unless is_open? - self.closed_at = DateTime.now + self.closed_at = Time.now.utc if open? + end + + 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") + + 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 - - def self.from_xml(xml, create=false) - begin - p = XML::Parser.new - p.string = xml - doc = p.parse - - cs = Changeset.new - - doc.find('//osm/changeset').each do |pt| - if create - cs.created_at = Time.now - # initial close time is 1h ahead, but will be increased on each - # modification. - cs.closed_at = Time.now + 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 - 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 - return cs + 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 + + 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 ## # 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. + # a single changeset doesn't contain too many elements. def add_changes!(elements) self.num_changes += elements end - def tags_as_hash - return tags - 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 - # 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. - if (closed_at - created_at) > (MAX_TIME_OPEN - IDLE_TIMEOUT) - self.closed_at = created_at + MAX_TIME_OPEN - else - self.closed_at = DateTime.now + IDLE_TIMEOUT - end - self.save! + save! tags = self.tags - ChangesetTag.delete_all(['id = ?', self.id]) + ChangesetTag.where(:changeset => 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 - 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? - - 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 - - el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil? - el1['uid'] = self.user_id.to_s if self.user.data_public? - self.tags.each do |k,v| - el2 = XML::Node.new('tag') - el2['k'] = k.to_s - el2['v'] = v.to_s - el1 << el2 + ## + # 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 - - el1['created_at'] = self.created_at.xmlschema - el1['closed_at'] = self.closed_at.xmlschema unless is_open? - el1['open'] = is_open?.to_s - - el1['min_lon'] = (bbox[0].to_f / GeoRecord::SCALE).to_s unless bbox[0].nil? - el1['min_lat'] = (bbox[1].to_f / GeoRecord::SCALE).to_s unless bbox[1].nil? - el1['max_lon'] = (bbox[2].to_f / GeoRecord::SCALE).to_s unless bbox[2].nil? - el1['max_lat'] = (bbox[3].to_f / GeoRecord::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 end ## @@ -225,18 +203,26 @@ class Changeset < ActiveRecord::Base # 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. - unless user.id == self.user_id - raise OSM::APIUserChangesetMismatchError - end - + raise OSM::APIUserChangesetMismatchError unless user.id == user_id + # can't change a closed changeset - unless is_open? - raise OSM::APIChangesetAlreadyClosedError.new(self) - end + raise OSM::APIChangesetAlreadyClosedError, self unless open? # copy the other's tags self.tags = other.tags save_with_tags! end + + def subscribe(user) + subscribers << user + end + + def unsubscribe(user) + subscribers.delete(user) + end + + def subscribed?(user) + subscribers.exists?(user.id) + end end