X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/cf304fe60f05f48251a480d19ce3ea9440f8a10e..c66851f474104b7e9acffba80e0dffe400332fab:/app/models/changeset.rb?ds=sidebyside diff --git a/app/models/changeset.rb b/app/models/changeset.rb index 85621dce2..e6bde19a5 100644 --- a/app/models/changeset.rb +++ b/app/models/changeset.rb @@ -1,73 +1,236 @@ -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) +# - belongs_to :user +class Changeset < ApplicationRecord + require "xml/libxml" - has_many :changeset_tags, :foreign_key => 'id' + belongs_to :user, :counter_cache => true - def self.from_xml(xml, create=false) - begin - p = XML::Parser.new - p.string = xml - doc = p.parse + has_many :changeset_tags - cs = Changeset.new + has_many :nodes + has_many :ways + has_many :relations + has_many :old_nodes + has_many :old_ways + has_many :old_relations - doc.find('//osm/changeset').each do |pt| - if create - cs.created_at = Time.now - end + 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" - 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 + 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 + # least 6 controllers + 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 set_closed_time_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_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 ||= 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. + def update_bbox!(bbox_update) + bbox.expand!(bbox_update) + + raise OSM::APISizeLimitExceeded if bbox.linear_size > size_limit + + # 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.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. + 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? - self.save! - end + save! - ChangesetTag.transaction do 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 + + ## + # 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 + + ## + # 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 + + # can't change a closed changeset + 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 + + def size_limit + @size_limit ||= ActiveRecord::Base.connection.select_value( + "SELECT api_size_limit($1)", "api_size_limit", [user_id] + ) + end end