Module: Fix::Protocol

Defined in:
lib/fix/protocol.rb,
lib/fix/protocol/field.rb,
lib/fix/protocol/message.rb,
lib/fix/protocol/version.rb,
lib/fix/protocol/messages.rb,
lib/fix/protocol/message_part.rb,
lib/fix/protocol/parse_failure.rb,
lib/fix/protocol/messages/logon.rb,
lib/fix/protocol/unordered_part.rb,
lib/fix/protocol/messages/logout.rb,
lib/fix/protocol/messages/reject.rb,
lib/fix/protocol/type_conversions.rb,
lib/fix/protocol/messages/md_entry.rb,
lib/fix/protocol/messages/heartbeat.rb,
lib/fix/protocol/messages/instrument.rb,
lib/fix/protocol/message_class_mapping.rb,
lib/fix/protocol/messages/test_request.rb,
lib/fix/protocol/messages/md_entry_type.rb,
lib/fix/protocol/repeating_message_part.rb,
lib/fix/protocol/messages/resend_request.rb,
lib/fix/protocol/messages/market_data_request.rb,
lib/fix/protocol/messages/market_data_snapshot.rb,
lib/fix/protocol/messages/market_data_incremental_refresh.rb

Overview

Main protocol namespace

Defined Under Namespace

Modules: MessageClassMapping, Messages, TypeConversions Classes: Field, Message, MessagePart, ParseFailure, RepeatingMessagePart, UnorderedPart

Constant Summary collapse

VERSION =

The fix-protocol gem version string

'1.0.2'

Class Method Summary collapse

Class Method Details

.alias_namespace! ⇒ Object

Alias the Fix::Protocol namespace to FP if possible



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# File 'lib/fix/protocol.rb', line 67

def self.alias_namespace!
  Object.const_set(:FP, Protocol) unless Object.const_defined?(:FP)
end

.parse(str) ⇒ Fix::Protocol::Message

Parses a string into a Fix::Protocol::Message instance

Parameters:

  • str (String) —

    A FIX message string

Returns:

  • (Fix::Protocol::Message) —

    A Fix::Protocol::Message instance, or a Fix::Protocol::ParseFailure in case of failure



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# File 'lib/fix/protocol.rb', line 24

def self.parse(str)
  errors    = []
  msg_type  = str.match(/^8\=[^\x01]+\x019\=[^\x01]+\x0135\=([^\x01]+)\x01/)

  unless str.match(/^8\=[^\x01]+\x019\=[^\x01]+\x0135\=[^\x01]+\x01.+10\=[^\x01]+\x01/)
    FP::ParseFailure.new("Malformed message <#{str}>")
  else

    klass = MessageClassMapping.get(msg_type[1])

    unless klass
      errors << "Unknown message type <#{msg_type[1]}>"
    end

    # Check message length
    length = str.gsub(/10\=[^\x01]+\x01$/, '').gsub(/^8\=[^\x01]+\x019\=([^\x01]+)\x01/, '').length
    if length != $1.to_i
      errors << "Incorrect body length"
    end

    # Check checksum
    checksum = str.match(/10\=([^\x01]+)\x01/)[1]
    if checksum != ('%03d' % (str.gsub(/10\=[^\x01]+\x01/, '').bytes.inject(&:+) % 256))
      errors << "Incorrect checksum"
    end

    if errors.empty?
      msg = klass.parse(str)

      if msg.valid?
        msg
      else
        FP::ParseFailure.new(msg.errors)
      end
    else
      FP::ParseFailure.new(errors)
    end
  end
end