Why doesn't on_eof get called on this example?

[Konstantin A. Pustovalov]

On 24.06.2014 00:47, Alexander Karelas wrote:
> http://stackoverflow.com/questions/24373840/why-isnt-on-eof-called-in-this-anyeventhandle-example 
>
>
> I notice that when there is on on_read function, then on_eof doesn't 
> get called when the telnet client connects and immediately disconnects.
>
> However when an $hdl->on_read(sub{ say "READ!" }); statement is 
> executed, then the on_eof event gets called even though the on_read 
> event never gets called.
>
> So why is on_read needed for on_eof, if it doesn't get executed? 
> Should this be in the documentation? Maybe this could be classified as 
> a bug?

You should read 
http://search.cpan.org/~mlehmann/AnyEvent-7.07/lib/AnyEvent/Handle.pm#NONFREQUENTLY_ASKED_QUESTIONS

Also, manual says about read queue:

 > It can be used in two ways, the "simple" way, using only|on_read|and 
the "complex" way, using a queue.

I think that when there is no on_read handler and read queue is empty ( 
there is no outstanding push_read requests ) AE::Handle is unable to 
decide whether to call on_eof or on_error. You should be able to 
construct AE::handle with no on_read and empty queue. Then make 
push_read( line => ) request and get on_error called.



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