CPU_PERCENT and GPS examples do not expose port

[johnwalicki]

Describe the bug
The CPU Percent example does not expose the port to query the CPU load
See https://github.com/open-horizon/examples/blob/master/edge/services/cpu_percent/horizon/service.definition.json

The README shows a curl excample but the user would need to run the curl within the workload container.
I am not certain that is the expected behavior.
The Makefile has a test rule which calls

../../../tools/curlServiceTest.sh

which is here: https://github.com/open-horizon/examples/blob/master/tools/curlServiceTest.sh
That script does a docker exec into the container and curl works.

If the purpose is to not expose the CPU performance data, then clarify in the README
If the intended example should report the CPU data, then service.definition.json should expose the port.

[tbsloan]

Hi John,
I will work with Troy, I think he owns/maintains those examples.

[tbsloan]

John - I contacted Troy - he was aware from examples meeting where this was discussed:

Troy Fine
1:49 PM
Hey Tim, ah yes John brought that up in the examples working group meeting this morning and mentioned he would open the issue … I’ll take a look at some of the documentation around and try to decide whether to make the change to expose the port or simply update the readme to mention you would need to exec into the container first

[johnwalicki]

@tbsloan Oops, sorry for the misdirect. GitHub type-ahead tagged you instead of Troy.

[tbsloan]

@johnwalicki No worries, we got it moved over to Troy.

[t-fine]

Similar to the open-horizon-services web-helloworld-python service exposes port 8000 we would like cpu_percent and gps to also expose the port to allow the service to be curl-ed from outside the container.

web-helloworld-python service.json file: https://github.com/open-horizon-services/web-helloworld-python/blob/main/service.json

cpu_percent: https://github.com/open-horizon/examples/tree/master/edge/services/cpu_percent

gps: https://github.com/open-horizon/examples/tree/master/edge/services/gps

[saurav1004]

@t-fine Could I be assigned this issue ?

If I am not wrong we need to expose the port in cpu_percent/horizon/service.defination.json and gps/horizon/service.defination.json so that the service can be curl-ed from outside the container.

[johnwalicki]

@saurav1004 - Yes, the service.definition.json files would expose the port. The web-helloworld-python service json has a snippet. Check the port number, it might be 8080

        "ports": [ 
          { "HostIP": "0.0.0.0", "HostPort": "8080:8080/tcp" }
        ]

[saurav1004]

Yes the port number is 8080 for both the services cpu_percent and gps

[saurav1004]

@johnwalicki I have created a draft pull request, will mark it "ready for review" once you confirm.

[johnwalicki]

The PR looks good. I think it's ready to merge.

[saurav1004]

Thanks, I have marked it ready for review. You should be able to merge it now.

[t-fine]

With the bump of version number of cpu_percent and gps in the PR just merged (#580) I will be closing this issue.