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# Copyright (C) 2015-2017 MongoDB, Inc.
#
# Licensed 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 Mongo
class Error
# Class for parsing the various forms that errors can come in from MongoDB
# command responses.
#
# @since 2.0.0
class Parser
# @return [ BSON::Document ] document The returned document.
attr_reader :document
# @return [ String ] message The error message parsed from the document.
attr_reader :message
# @return [ Array<Protocol::Message> ] replies The message replies.
attr_reader :replies
# Create the new parser with the returned document.
#
# @example Create the new parser.
# Parser.new({ 'errmsg' => 'failed' })
#
# @param [ BSON::Document ] document The returned document.
#
# @since 2.0.0
def initialize(document, replies = nil)
@document = document || {}
@replies = replies
parse!
end
private
def parse!
@message = ""
parse_single(@message, ERR)
parse_single(@message, ERROR)
parse_single(@message, ERRMSG)
parse_multiple(@message, WRITE_ERRORS)
parse_single(@message, ERRMSG,
document[WRITE_CONCERN_ERROR]) if document[WRITE_CONCERN_ERROR]
parse_flag(@message)
end
def parse_single(message, key, doc = document)
if error = doc[key]
append(message ,"#{error} (#{doc[CODE]})")
end
end
def parse_multiple(message, key)
if errors = document[key]
errors.each do |error|
parse_single(message, ERRMSG, error)
end
end
end
def parse_flag(message)
if replies && replies.first &&
(replies.first.respond_to?(:cursor_not_found?)) && replies.first.cursor_not_found?
append(message, CURSOR_NOT_FOUND)
end
end
def append(message, error)
if message.length > 1
message.concat(", #{error}")
else
message.concat(error)
end
end
end
end
end
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