The bidding-system-java from felipegutierrez

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This is a bidding system implemented using Java 11 with Spring-webflux and the project-reactor. The project uses spring-actuator and micrometer to expose metrics to Prometheus and visualize them in Grafana. Prometheus alertmanager, nodeexporter, and blackbox are also configured with multiple rules w.r.t. the service and the host system.

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Configure metrics

Configure metrics using spring boot actuator + micrometer + Prometheus

metrics: https://tomgregory.com/spring-boot-default-metrics/
prometheus: https://dev.to/ablx/minimal-prometheus-setup-with-docker-compose-56mp
grafana: https://finestructure.co/blog/2016/5/16/monitoring-with-prometheus-grafana-docker-part-1
rules: http://127.0.0.1:9090/rules
alert manager: http://127.0.0.1:9090/alerts
node export
incrementer and decrementer counter to bidder requests
blackbox exporter
pushgateway: https://github.com/stefanprodan/dockprom and https://github.com/prometheus/pushgateway

running the script ./run-test.sh fails eventually due to a duplicate bid of different offers.

running ./run-test.sh fails eventually

$ ./run-test.sh 
--- result	2021-05-04 14:39:18.545379451 +0200
+++ expected.result	2021-05-03 12:24:52.327669639 +0200
@@ -1,11 +1,11 @@
 a:750
 c:2500
 c:5000
-b:750
+a:750
 b:1250
 c:2500
 c:6000
-c:1000
+b:1000
 a:750
 c:500
 c:1000

This is because both bidders b:750 and a:750 are bidding 750:

felipe@alreadytaken:~/workspace-idea/bidding-system-java$ curl -s "http://localhost:8080/4?a=5&b=3"; echo
a:750
felipe@alreadytaken:~/workspace-idea/bidding-system-java$ curl -s "http://localhost:8080/4?a=5&b=3"; echo
b:750

and the application takes the first. Check the logs:

2021-05-04 14:39:58.107  INFO 51455 --- [     parallel-3] BidResponse                              : request(256)
2021-05-04 14:39:58.111  INFO 51455 --- [r-http-epoll-10] BidResponse                              : onNext(BidResponse(id=4, bid=750, content=b:$price$))
2021-05-04 14:39:58.111  INFO 51455 --- [r-http-epoll-12] BidResponse                              : onNext(BidResponse(id=4, bid=750, content=a:$price$))
2021-05-04 14:39:58.111  INFO 51455 --- [r-http-epoll-11] BidResponse                              : onNext(BidResponse(id=4, bid=500, content=c:$price$))
2021-05-04 14:39:58.112  INFO 51455 --- [r-http-epoll-10] BidResponse                              : onComplete()
2021-05-04 14:39:58.112  INFO 51455 --- [r-http-epoll-12] BidResponse                              : onComplete()
2021-05-04 14:39:58.112  INFO 51455 --- [r-http-epoll-11] BidResponse                              : onComplete()
2021-05-04 14:40:00.250  INFO 51455 --- [or-http-epoll-5] o.g.f.b.a.handler.AuctionHandlerFunc     : received bid request with adID: 4 attributes: {a=[5], b=[3]}
2021-05-04 14:40:00.250  INFO 51455 --- [     parallel-1] BidResponse                              : onSubscribe(FluxOnErrorResume.ResumeSubscriber)
2021-05-04 14:40:00.251  INFO 51455 --- [     parallel-1] BidResponse                              : request(256)
2021-05-04 14:40:00.251  INFO 51455 --- [     parallel-2] BidResponse                              : onSubscribe(FluxOnErrorResume.ResumeSubscriber)
2021-05-04 14:40:00.251  INFO 51455 --- [     parallel-2] BidResponse                              : request(256)
2021-05-04 14:40:00.251  INFO 51455 --- [     parallel-3] BidResponse                              : onSubscribe(FluxOnErrorResume.ResumeSubscriber)
2021-05-04 14:40:00.251  INFO 51455 --- [     parallel-3] BidResponse                              : request(256)
2021-05-04 14:40:00.254  INFO 51455 --- [r-http-epoll-12] BidResponse                              : onNext(BidResponse(id=4, bid=750, content=a:$price$))
2021-05-04 14:40:00.255  INFO 51455 --- [r-http-epoll-12] BidResponse                              : onComplete()
2021-05-04 14:40:00.255  INFO 51455 --- [r-http-epoll-10] BidResponse                              : onNext(BidResponse(id=4, bid=750, content=b:$price$))
2021-05-04 14:40:00.255  INFO 51455 --- [r-http-epoll-11] BidResponse                              : onNext(BidResponse(id=4, bid=500, content=c:$price$))

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