ballerina-http-circuit-breaker-sample

Sample test for Ballerina HTTP circuit breaker functionality

This is a sample code for test the ballerina HTTP circuit breaker functionality.

Modules

Weather Service

The weather_service module mocking a weather service, which will send the current temperature for a client who sends a GET request. This service is created to send the temperature service once in a while, to mock a failing service. It sends an 500_INTERNAL_ERROR response, most of the time.

Circuit Breaker Service

This service acts as the gateway for the temperature service. Clients sends the request to this service and it will forward the requests, through a Ballerina circuit breaker client. As the temperature service fails, the circuit breaker client will stop sending the requests to the upstream service, instead it sends error response to the client directly, until the reset time reaches.

Client

This module has a simple client which will send a Get request to the circuit breaker service periodically, using Ballerina task.

How to run

Download and Install ballerina.
Pull this repository
Go inside the ballerina-circuit-breaker-example directory and execute following command in a terminal.

ballerina run weather_service

This will starts the weather service back ends. You can confirm the services are up and running when the following messages appear.

[ballerina/http] started HTTP/WS listener 0.0.0.0:9091
[ballerina/http] started HTTPS/WSS listener 0.0.0.0:9092
[ballerina/http] started HTTP/WS listener 0.0.0.0:9090

Then open a new terminal at the ballerina-circuit-breaker-example and execute the following command.

ballerina run circuit_breaker_service

This will start the circuit breaker client. It will show the following if the service is up and running.

[ballerina/http] started HTTP/WS listener 0.0.0.0:8080
[ballerina/http] started HTTP/WS listener 0.0.0.0:8081
[ballerina/http] started HTTPS/WSS listener 0.0.0.0:8082

Now you can invoke any client to send a request to the backend. There are three clients.

http1_client - This is the basic HTTP/1 client
http2_client - This is the basic HTTP/2 client
http2_client_ssl - This client uses HTTP2 and SSL to connect with the backend

You can run one of the clients by opening a new terminal inside ballerina-circuit-breaker-example and running either of the following commands

ballerina run http1_client

ballerina run http2_client

ballerina run http2_client_ssl

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