lookupippoc

lookupippoc

A proof of concept to test using AddrinfoEx with events

The net package for Go is using Addrinfo to do address resolution. This is a synchronous call which results in ctx context not being able to cancel a request as well as each concurrent call ties up a O/S level thread. This repository is a proof of concept to see if AddrinfoEx is a reasonable alternative to Addrinfo. Note that AddrinfoEx is only available in later versions of Windows so the code has to check to make sure that AddrinfoEx is available (as well as WaitForMultipleObjects). Other possible drawbacks include the additional complexity. AddrinfoEx does not support IO Completion Ports, only IO Completion Routines and Events. I don't see any way to support IO Completion Routines without a hack to the Go runtime so this POC will use Events.

The existing Addrinfo implementation limits the number of concurrent Addrinfo calls to 500 with no comment as to why this limit. This POC will use a limit of 512 (8 * 64) just to be similar to the original code but this approach should not be used in production without some research as to why the 500 limit exists and should it be any different when using AddrinfoEx.