eval_everywhere & safe_eval_everywhere Preview

[linearregression]

*eval_everywhere Just like rpc's verison apply(Nodes, Module, Function) on the specified nodes. Pure fire and pray. Always return abcast. Nodes is [] or [::node()] eval_everywhere(Nodes, M, F) <-- rpc left this out eval_everywhere(Nodes, M, F, A), eval_everywhere(Nodes, M, F, A, SendTO)

*safe_eval_everywhere (rpc does not have equivalent version) apply(Nodes, Module, Function) on the specified nodes. Returns a list of nodes with status true or {badrpc, Reason} or {badtcp, Reason}. e.g. If SLAVE and SLAVE1 are present to receive messages. Error/Sucess Semantics same as safe_cast. e.g. [{?SLAVE,true}, {?SLAVE1,true},{?FAKE_NODE,{badrpc,nodedown}}] Apply on empty nodes return []. safe_eval_everywhere(Nodes, M, F), safe_eval_everywhere(Nodes,M,F,A), safe_eval_everywhere(Nodes, M, F, A, SendTO)

Note:

• on throw,it will trigger a {nocatch,throwXup}, ....} on the target node.

Tests:

• Since the fire and pray nature, we don't know if target system received anything. The original idea was to store something uniquely recognizable for that run and use rpc:call to get the result back to check.However, rpc:call always get there earlier than gen_rpc. So now it is no better than just like checking the return signature like gen_rpc:cast has been doing.
• The test server has dbg trace on for some eye balling (which is subopt).
• going to replace test with something simpler

[priestjim]

Can you please rebase off of develop first?

[linearregression]

Hi, got the chance to check it out yet?

[priestjim]

What you can do is use call to fetch the state from the test gen_server and see if the call has been evaluated. But you need to flush it for every test.

[linearregression]

• ditch test sever. Too many auxiliary test modules.
• master node trigger slaves nodes to ping him back with test case unique message
• master node relay the results back to test script to verify results
• test execution not overly rely on timeout for event synchronization

[linearregression]

done

[linearregression]

please review.