has_many :old_ways
has_many :old_relations
- validates_presence_of :user_id, :created_at
- validates_inclusion_of :open, :in => [ true, false ]
+ validates_presence_of :user_id, :created_at, :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 (note that this
+ # is in days - so one hour is Rational(1,24)).
+ MAX_TIME_OPEN = 1
+
+ # 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 = Rational(1,24)
+
# 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?
- return 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.
+ return ((closed_at > DateTime.now) and (num_changes <= MAX_ELEMENTS))
end
+ def set_closed_time_now
+ closed_at = DateTime.now
+ end
+
def self.from_xml(xml, create=false)
begin
p = XML::Parser.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|
self.min_lon, self.min_lat, self.max_lon, self.max_lat = @bbox
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_as_hash
return tags
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
+ # 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!
- end
- ChangesetTag.transaction do
tags = self.tags
ChangesetTag.delete_all(['id = ?', self.id])
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')
end
el1['created_at'] = self.created_at.xmlschema
- el1['open'] = self.open.to_s
+ el1['closed_at'] = self.closed_at.xmlschema unless is_open?
+ el1['open'] = is_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?
+ 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
return 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.
+ unless user.id == self.user_id
+ raise OSM::APIUserChangesetMismatchError
+ end
+
+ # can't change a closed changeset
+ unless is_open?
+ raise OSM::APIChangesetAlreadyClosedError.new(self)
+ end
+
+ # copy the other's tags
+ self.tags = other.tags
+
+ save_with_tags!
+ end
end
projects / rails.git / blobdiff