Spring Cloud Gateway

Testing spring cloud with integration of, without Netflix dependencies

Spring Gateway
Spring Load-balancer
Spring Webflux (client)

Gateway configuration

Gateway configuration takes these:

API Url	Method	Description	Goal
/api/v1/{lang}	GET	Greetings response	To test gateway load-balancing and data failure. Include chain filters.
/api/v1/{lang}	POST	Greetings response, pass parameter "name"	To test gateway load-balancing and data failure. Include chain filters.
/api/v2/{lang}	GET	Greetings response	Enabling routing via codes.
/upload	POST	File uploading	File limitation control
/socket-io/event-emitter	Websocket	Test websocket	Test websocket, use this site "https://www.websocket.org/echo.html" and enter ws://{hostname}:{port}
/images/*	GET	Routing images to another location	Routing image, redirect
/static/report/sample.txt or /static/images/pictoral.jpg	GET	Static file access, Add header "Token" = "abc123" to request

NOTES: Filter enables for ip address

NOTES: Load balancing is using health-check configuration and it's checked every 5seconds. Cached need to be disabled to allow Load balancing.

NOTES: To change path for health-check modify spring.cloud.loadbalancer.health-check.path.default (or remove it)

Test proved

Load-balancing via health-check, if "spring.cloud.loadbalancer.configurations: health-check" and are based on 5 seconds interval with program path /status as check. If reverting to round-robing, remove "spring.cloud.loadbalancer.configurations" and "spring.cloud.loadbalancer.cache" in application.yml. No Zuul or Ribbon is used in this setting.
Simple Cloud Discovery instead of using Eureka.
Web Filtering and ordering in Gateway.
Traffic-control based on IP headers to deny access.
Websocket and load-balancing on websocket.
Resource routing.
File upload and controlling file limitation access.
Enabling CORS.
Disable Dynamic resource control by adding spring.cloud.config.enabled = false in bootstrap.yml
Serving of static files. (Does not address caching resources, would think running another microservice is better.)

Webclient

Web client is using Webflux and are Docker Compose enabled.

To run manually, do ./gradlew bootRun
To run via docker do

./build-docker.sh
docker run -p 8081:8080 demo-gw-web:1.0
docker ps

If to run via docker -compose, do

#docker-compose build
docker-compose up -d
#docker-compose down

NOTES: Used actuator, where the url http://{hostname}:{port}/actuator/health returns the server status for gateway health check.. There is also http://{hostname}:{port}/status to reply for gateway health check. Remove "path.default" from spring.cloud.loadbalancer.health-check and it will point to /actuator/health.

Load Test and Test Suite

Download SOAP UI.
Import project from gw-demo\soapui-test\SOAPProject.xml
Or use apache load test (without an idea if there are errors)

ab -n 100 -c 10 http://127.0.0.1:9000/api/v1/

Getting Started or Running Program

Change directory to /gw-demo/src/main/resources and open application.yml, modify 'spring.cloud.discovery.client.simple.instance.greeting-service(s).uri', and change "raspberrypi" to "localhost" or "127.0.0.1".
Start gateway by executing:

cd gw-demo
./gradlew bootRun

Try and do a curl GET on http://localhost:9000/api/v1/greetings/pt. It should FAIL
Start webservices by either