lorem-hystrix

This is simple service module. Only for showing the micro service with HTTP and return json. The purpose for this service is only generating lorem ipsum paragraph and return the payload.

In this part I will demonstrate the circuit breaker patter. I copied from lorem-consul.

I am fully using all three functions from the golorem library.

Required libraries

go get github.com/go-kit/kit
go get github.com/drhodes/golorem
go get github.com/gorilla/mux
go get github.com/juju/ratelimit
go get github.com/prometheus/client_golang/prometheus
go get github.com/go-kit/kit/sd/consul
go get github.com/afex/hystrix-go/hystrix

service.go

Business logic will be put here

endpoint.go

Endpoint will be created here

transport.go

Handling about encode and decode json

logging.go

Logging function is under this file

instrument.go

Middleware function. For this sample, this function for rate limiting and metrics.

discovery.go

Consul service registration utility

lorem-consul.d

Go main function to build service and register to consul

discover.d

Go main function for discover service

Running Consul

docker run --rm -p 8400:8400 -p 8500:8500 -p 8600:53/udp -h node1 progrium/consul -server -bootstrap -ui-dir /ui

Running hystrix dashboard

The dashboard is running on http://localhost:8181/hystrix

docker run -p 8181:9002 --name hystrix-dashboard mlabouardy/hystrix-dashboard:latest

Running Prometheus and Grafana

To execute type

cd $GOPATH/src/github.com/ru-rocker/gokit-playground
docker-compose -f docker/docker-compose-prometheus-grafana-consul.yml up -d

execute

cd $GOPATH/src/github.com/ru-rocker/gokit-playground
go run lorem-hystrix/lorem-hystrix.d/main.go -consul.addr localhost -consul.port 8500 -advertise.addr 192.168.1.103 -advertise.port 7002
go run lorem-hystrix/discover.d/main.go -consul.addr localhost -consul.port 8500

execute request in forever loop

while true; do curl -XPOST -d'{"requestType":"word", "min":10, "max":10}' http://localhost:8080/sd-lorem; sleep 1; done;
while true; do curl -XPOST -d'{"requestType":"sentence", "min":10, "max":10}' http://localhost:8080/sd-lorem; sleep 1; done;
while true; do curl -XPOST -d'{"requestType":"paragraph", "min":10, "max":10}' http://localhost:8080/sd-lorem; sleep 1; done;