X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/5143fbcd5bbaf59e498fff4ac7dd797342a69a04..63cc3c195a03e469bc23b5bf2b60f4435c57c443:/lib/diff_reader.rb diff --git a/lib/diff_reader.rb b/lib/diff_reader.rb index 37de8ea59..de2da3c6b 100644 --- a/lib/diff_reader.rb +++ b/lib/diff_reader.rb @@ -18,19 +18,24 @@ class DiffReader # in OsmChange format. All diffs must be limited to a single changeset # given in +changeset+. def initialize(data, changeset) - @reader = XML::Reader.new data + @reader = XML::Reader.string(data) @changeset = changeset + # document that's (re-)used to handle elements expanded out of the + # diff processing stream. + @doc = XML::Document.new + @doc.root = XML::Node.new("osm") end ## # Reads the next element from the XML document. Checks the return value # and throws an exception if an error occurred. def read_or_die - # NOTE: XML::Reader#read returns 0 for EOF and -1 for error. - # we allow an EOF because we are expecting this to always happen - # at the end of a document. - if @reader.read < 0 - raise APIBadUserInput.new("Unexpected end of XML document.") + # NOTE: XML::Reader#read returns false for EOF and raises an + # exception if an error occurs. + begin + @reader.read + rescue LibXML::XML::Error => ex + raise OSM::APIBadXMLError.new("changeset", xml, ex.message) end end @@ -53,7 +58,18 @@ class DiffReader # as the call to @reader.next in the innermost loop will take # care of that for us. if @reader.node_type == 1 # element - yield @reader.name + name = @reader.name + attributes = {} + + if @reader.has_attributes? + while @reader.move_to_next_attribute == 1 + attributes[@reader.name] = @reader.value + end + + @reader.move_to_element + end + + yield name, attributes else read_or_die end @@ -69,12 +85,25 @@ class DiffReader # elements, it would be better to DRY and do this in a block. This # could also help with error handling...? def with_model - with_element do |model_name| + with_element do |model_name,model_attributes| model = MODELS[model_name] - raise "Unexpected element type #{model_name}, " + - "expected node, way, relation." if model.nil? - yield model, @reader.expand + raise OSM::APIBadUserInput.new("Unexpected element type #{model_name}, " + + "expected node, way or relation.") if model.nil? + # new in libxml-ruby >= 2, expand returns an element not associated + # with a document. this means that there's no encoding parameter, + # which means basically nothing works. + expanded = @reader.expand + + # create a new, empty document to hold this expanded node + new_node = @doc.import(expanded) + @doc.root << new_node + + yield model, new_node @reader.next + + # remove element from doc - it will be garbage collected and the + # rest of the document is re-used in the next iteration. + @doc.root.child.remove! end end @@ -103,13 +132,13 @@ class DiffReader # take the first element and check that it is an osmChange element @reader.read - raise APIBadUserInput.new("Document element should be 'osmChange'.") if @reader.name != 'osmChange' + raise OSM::APIBadUserInput.new("Document element should be 'osmChange'.") if @reader.name != 'osmChange' result = OSM::API.new.get_xml_doc result.root.name = "diffResult" # loop at the top level, within the element - with_element do |action_name| + with_element do |action_name,action_attributes| if action_name == 'create' # create a new element. this code is agnostic of the element type # because all the elements support the methods that we're using. @@ -129,7 +158,7 @@ class DiffReader # some elements may have placeholders for other elements in the # diff, so we must fix these before saving the element. - new.fix_placeholders!(ids) + new.fix_placeholders!(ids, placeholder_id) # create element given user new.create_with_history(@changeset.user) @@ -155,19 +184,21 @@ class DiffReader # if the ID is a placeholder then map it to the real ID model_sym = model.to_s.downcase.to_sym - is_placeholder = ids[model_sym].include? new.id - id = is_placeholder ? ids[model_sym][new.id] : new.id + client_id = new.id + is_placeholder = ids[model_sym].include? client_id + id = is_placeholder ? ids[model_sym][client_id] : client_id # and the old one from the database old = model.find(id) + # translate any placeholder IDs to their true IDs. new.fix_placeholders!(ids) + new.id = id + old.update_from(new, @changeset.user) xml_result = XML::Node.new model.to_s.downcase - # oh, the irony... the "new" element actually contains the "old" ID - # a better name would have been client/server, but anyway... - xml_result["old_id"] = new.id.to_s + xml_result["old_id"] = client_id.to_s xml_result["new_id"] = id.to_s # version is updated in "old" through the update, so we must not # return new.version here but old.version! @@ -182,7 +213,7 @@ class DiffReader # delete doesn't have to contain a full payload, according to # the wiki docs, so we just extract the things we need. new_id = xml['id'].to_i - raise API::APIBadXMLError.new(model, xml, "ID attribute is required") if new_id.nil? + raise OSM::APIBadXMLError.new(model, xml, "ID attribute is required") if new_id.nil? # if the ID is a placeholder then map it to the real ID model_sym = model.to_s.downcase.to_sym @@ -201,12 +232,23 @@ class DiffReader # can a delete have placeholders under any circumstances? # if a way is modified, then deleted is that a valid diff? new.fix_placeholders!(ids) - old.delete_with_history!(new, @changeset.user) xml_result = XML::Node.new model.to_s.downcase # oh, the irony... the "new" element actually contains the "old" ID # a better name would have been client/server, but anyway... xml_result["old_id"] = new_id.to_s + + if action_attributes["if-unused"] + begin + old.delete_with_history!(new, @changeset.user) + rescue OSM::APIPreconditionFailedError => ex + xml_result["new_id"] = old.id.to_s + xml_result["new_version"] = old.version.to_s + end + else + old.delete_with_history!(new, @changeset.user) + end + result.root << xml_result end