Shopify/toxiproxy

Toxiproxy is a framework for simulating network conditions. It's made specifically to work in testing, CI and development environments, supporting deterministic tampering with connections, but with support for randomized chaos and customization. Toxiproxy is the tool you need to prove with tests that your application doesn't have single points of failure. We've been successfully using it in all development and test environments at Shopify since October, 2014. See our blog post on resiliency for more information.

Toxiproxy usage consists of two parts. A TCP proxy written in Go (what this repository contains) and a client communicating with the proxy over HTTP. You configure your application to make all test connections go through Toxiproxy and can then manipulate their health via HTTP. See Usage below on how to set up your project.

For example, to add 1000ms of latency to the response of MySQL from the Ruby client:

While the examples in this README are currently in Ruby, there's nothing stopping you from creating a client in any other language (see Clients).

The existing ones we found didn't provide the kind of dynamic API we needed for integration and unit testing. Linux tools like nc and so on are not cross-platform and require root, which makes them problematic in test, development and CI environments.