napicella / fi-proxy

Failure injector proxy

fi-proxy PoC

Failure injector proxy.
Transparent egress proxy which inject latency to your dependencies to test how the system reacts to increased latency/failures.
This is a PoC, it needs some work to be used:

• failures configuration requires changing the code
• there are no tests in place

Usage

For now the failures are encoded directly in the main:
You need to change the endpoint that should cause latency/failures in the main.

After that, rebuild and run it:

go build
./fi-proxy --proto http

Start the service under test, using the proxy. This depends on the language used for the service, i.e. for java you need to start it with:

## Proxy http/s to localhost:8888
JAVA_FLAGS="-Dhttp.proxyHost=localhost -Dhttp.proxyPort=8888 -Dhttps.proxyHost=localhost -Dhttps.proxyPort=8888 -Dhttp.nonProxyHosts="
## Start your service
java ${JAVA_FLAGS} -jar your-service.jar 

Reference

Transparent proxy code is inspired by @mlowicki's blog post