circuit-breaker-example

Shows how to leverage circuit breaking in go, using gobreaker.

Inspired by Secure integrations with Circuit Breaker in Go.

implementation

A client makes requests to server's /trip endpoint. /trip returns 200 by default.

server's status codes can be toggled to 5xx and back to 200 by hitting /circuit/open and /circuit/close.

TL;DR when the circuit is closed it means we'll let requests go to the origin; when it's open we'll return the latest response without hitting the origin. We'll set the circuit to half-open to let few requests in to check the status of the origin.

run

Just run docker-compose up. You can then:

• hit the open endpoint with curl http://localhost:8080/circuit/open
• hit the close endpoint with curl http://localhost:8080/circuit/close
• check metrics on prometheus at localhost:9090
• check metrics on grafana at localhost:3030

metrics

Circuit statuses vs response codes: