quintans / grapevine-microservices-poc

Proof of concept using grapevine to build a microservice solution

grapevine-microservice-poc

Proof of concept using grapevine to build a microservice solution that follows a event driven architecture.

It includes a service, a gateway and a taskboard.

Service

The implemented service replies "Hello" with the supplied name.

To launch the service open a terminal in the helloservice folder and run

go run helloservice.go

This will start a grapevine peer listening in port 5000.

To have more info, create a another service, a bad one, by running:

go run helloservice.go -gv 5001 -bad 100

This will start a grapevine peer listening in port 5001 and will have 33% timeout and 66% of a long reply (2s)

Gateway

The gateway is responsible to interface between the http client an the grapevine services. On top of the resilience provided by the grapevine load balancers, all the call go through a circuit breaker.

Additionally we also the collection and publishing of metrics. This gateway will periodically (10s) publish the collected metrics from the load balancer and the circuit breaker.

To launch the gateway open a terminal in the gateway folder and run

go run gateway.go

To test the service open a browser (or whatever you like) and run, for example, to http://localhost:8080/api/Quintans

Dashboard

The dashboard listens the published metrics from the gateway and agregates them. It also makes available the endpoint /stats for server sent events to be consumed by any compatible browser, with a refresh rate of 10s.

It also provides a web frontend to presents the information in the following layout:

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Circuit Breaker

Global report for each service, from the perspective of a Circuit Breaker (CB).

Service Name	CB State	ok / all	Success
hello	Closed	2/3	(785457/85) 100%
hi	Open	0/2

Load Balacing

Report for each service from the perspective of the Load Balancer (LB). Every LB will send its statistics.

Service Name	Quarantine	Success	Location
hello	OK	(15990/143) 99%	127.0.0.1:5001
hello	OK		127.0.0.1:5002
hello	NOK	0%	127.0.0.1:5003
hi	NOK		127.0.0.1:5011
hi	NOK		127.0.0.1:5012

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To launch the gateway open a terminal in the dashboard folder and run

go run dashboard.go

and open browser in http://localhost:8070/