add functional testing for pollster service

I have an idea of using CL to get the information of polling agent,If we write a polling agent,we can use the cmd line to get the information,for example,ceilometer --polling_agent cpu interval 60(cpu is the name of agent which is defined in the setup.cfg).

what is a 'CL'?

i mean comman line,we can use cliff to generate the command line and use the CL to test the polling agent.

I think we can add a command in ceilometer python client--poll,just like 'ceilometer poll --namesapce=ceilometer.poll.compute --module=cpu',the command will print the message generated by polling agent.

to be honest, this would be quite complicated as these are two different services. it would go from client -> API -> polling agent and back... and there is currently no way to for API to communicate with polling agents. integration full stack testing might be the easiest and most realistic test

yes,it's quite complicated,but if we launch a new ceilometer compute|central service in ceilometer python client,and just loading the plugin using DriverManager in stevedore.I know this will increasing the load,but it's rare situations in developing,so we can destroy the service if the developers don't use the poll command,and we will reduce the burden as much as we can.

More easier,we can just load the pollster plugin that developers write and the discovery plugin.

hi,gordon,Why can't we implement the function in ceilometer API,in the api code ,we can just load the pollster plugin that developers write and the discovery plugin.I think it's easier than full stack testing.

i'm not sure what you mean by API service here. do you mean the REST API service?

yes,REST API,when you request the ceilometer api service,the specific function will load the pollster plugin that developers write to get the samples produced by the pollster plugin.

but the REST api does not communicate with polling agent?

now the polling agents are managed by agentManager,and the aim of this bug is adding the function test for specifically polling agent(one or more),so we can add a function which loads the polling agent,and the function returns the result of the polling agent.Access the functon and get the result is achieved by ceilometer REST api.

Fix proposed to branch: master
Review: https://review.openstack.org/294898

Fix proposed to branch: master
Review: https://review.openstack.org/294900

not merged.

your solution does not actually test the polling agent. it just tests that the pollsters it loads does something.

so you want to konw what happened in the process of starting the polling agent service? including whether all of the pollsters are started correctly.

Change abandoned by gordon chung (<email address hidden>) on branch: master
Review: https://review.openstack.org/294900
Reason: REST api is deprecated

Change abandoned by gordon chung (<email address hidden>) on branch: master
Review: https://review.openstack.org/294898
Reason: api is deprecated