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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
module Avro
class Protocol
VALID_TYPE_SCHEMA_TYPES = Set.new(%w[enum record error fixed])
VALID_TYPE_SCHEMA_TYPES_SYM = Set.new(VALID_TYPE_SCHEMA_TYPES.map(&:to_sym))
class ProtocolParseError < Avro::AvroError; end
attr_reader :name, :namespace, :types, :messages, :md5
def self.parse(protocol_string)
json_data = MultiJson.load(protocol_string)
if json_data.is_a? Hash
name = json_data['protocol']
namespace = json_data['namespace']
types = json_data['types']
messages = json_data['messages']
Protocol.new(name, namespace, types, messages)
else
raise ProtocolParseError, "Not a JSON object: #{json_data}"
end
end
def initialize(name, namespace=nil, types=nil, messages=nil)
# Ensure valid ctor args
if !name
raise ProtocolParseError, 'Protocols must have a non-empty name.'
elsif !name.is_a?(String)
raise ProtocolParseError, 'The name property must be a string.'
elsif !namespace.is_a?(String)
raise ProtocolParseError, 'The namespace property must be a string.'
elsif !types.is_a?(Array)
raise ProtocolParseError, 'The types property must be a list.'
elsif !messages.is_a?(Hash)
raise ProtocolParseError, 'The messages property must be a JSON object.'
end
@name = name
@namespace = namespace
type_names = {}
@types = parse_types(types, type_names)
@messages = parse_messages(messages, type_names)
@md5 = Digest::MD5.digest(to_s)
end
def to_s
MultiJson.dump to_avro
end
def ==(other)
to_avro == other.to_avro
end
private
def parse_types(types, type_names)
type_objects = []
types.collect do |type|
# FIXME adding type.name to type_names is not defined in the
# spec. Possible bug in the python impl and the spec.
type_object = Schema.real_parse(type, type_names, namespace)
unless VALID_TYPE_SCHEMA_TYPES_SYM.include?(type_object.type_sym)
msg = "Type #{type} not an enum, record, fixed or error."
raise ProtocolParseError, msg
end
type_object
end
end
def parse_messages(messages, names)
message_objects = {}
messages.each do |name, body|
if message_objects.has_key?(name)
raise ProtocolParseError, "Message name \"#{name}\" repeated."
elsif !body.is_a?(Hash)
raise ProtocolParseError, "Message name \"#{name}\" has non-object body #{body.inspect}"
end
request = body['request']
response = body['response']
errors = body['errors']
message_objects[name] = Message.new(name, request, response, errors, names, namespace)
end
message_objects
end
protected
def to_avro(names=Set.new)
hsh = {'protocol' => name}
hsh['namespace'] = namespace if namespace
hsh['types'] = types.map{|t| t.to_avro(names) } if types
if messages
hsh['messages'] = messages.inject({}) {|h, (k,t)| h[k] = t.to_avro(names); h }
end
hsh
end
class Message
attr_reader :name, :request, :response, :errors, :default_namespace
def initialize(name, request, response, errors=nil, names=nil, default_namespace=nil)
@name = name
@default_namespace = default_namespace
@request = parse_request(request, names)
@response = parse_response(response, names)
@errors = parse_errors(errors, names) if errors
end
def to_avro(names=Set.new)
{
'request' => request.to_avro(names),
'response' => response.to_avro(names)
}.tap do |hash|
hash['errors'] = errors.to_avro(names) if errors
end
end
def to_s
Yajl.dump to_avro
end
def parse_request(request, names)
unless request.is_a?(Array)
raise ProtocolParseError, "Request property not an Array: #{request.inspect}"
end
Schema::RecordSchema.new(nil, default_namespace, request, names, :request)
end
def parse_response(response, names)
if response.is_a?(String) && names
fullname = Name.make_fullname(response, default_namespace)
return names[fullname] if names.include?(fullname)
end
Schema.real_parse(response, names, default_namespace)
end
def parse_errors(errors, names)
unless errors.is_a?(Array)
raise ProtocolParseError, "Errors property not an Array: #{errors}"
end
Schema.real_parse(errors, names, default_namespace)
end
end
end
end
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