net_tcp_client

Net::TCPClient is a TCP Socket Client with built-in timeouts, retries, and logging

• http://github.com/reidmorrison/net_tcp_client

Introduction

Net::TCPClient implements resilience features that most developers wish was already included in the standard Ruby libraries.

With so many "client" libraries to servers such us memcache, MongoDB, Redis, etc. their focus is on the communication formats and messaging interactions. As a result adding resilience is usually an after thought.

More importantly the way that each client implements connection failure handling varies dramatically. The purpose of this library is to extract the best of all the socket error handling out there and create a consistent way of dealing with connection failures.

Another important feature is that the connect and read API's use timeout's to prevent a network issue from "hanging" the client program.

Net::TCPClient API

Net::TCPClient is a drop in replacement for TCPSocket when used as a client.

The initializer is the only deviation since it accepts several new options that support automatic failover, re-connect and messaging retries.

Example

Connect to a server at address localhost, and on port 3300.

Specify a custom retry interval and retry counts during connection.

require 'net/tcp_client'

Net::TCPClient.connect(
  server:                 'localhost:3300',
  connect_retry_interval: 0.1,
  connect_retry_count:    5
) do |client|
  # If the connection is lost, create a new one and retry the send
  client.retry_on_connection_failure do
    client.send('Update the database')
  end
  response = client.read(20)
  puts "Received: #{response}"
end

Dependencies

• Ruby 1.9.3, JRuby 1.7, or greater

There is a soft dependency on SemanticLogger. It will use SemanticLogger only if it is already available, otherwise any other standard Ruby logger can be used.

• SemanticLogger

Production Use

Net::TCPClient was built for and is being used in a high performance, highly concurrent production environment. The resilient capabilities of Net::TCPClient are put to the test on a daily basis, especially with connections over the internet between remote data centers.

Installation

gem install net_tcp_client

Meta

• Code: git clone git://github.com/reidmorrison/net_tcp_client.git
• Home: https://github.com/reidmorrison/net_tcp_client
• Bugs: http://github.com/reidmorrison/net_tcp_client/issues
• Gems: http://rubygems.org/gems/net_tcp_client

This project uses Semantic Versioning.

Author

Reid Morrison :: @reidmorrison

License

Copyright 2012, 2013, 2014 Reid Morrison

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.