Commits on Aug 31, 2023

1. Add mochiweb_request:is_closed/1 function …

   This function can used during long running request callbacks to detect if the
   client connection is closed.
   
   If the request callback periodically streams data back to the client, the act
   of writting to the client socket will detect if it is closed or not. However,
   in cases when no data is sent back, and the client times-out and closes the
   connection, it may be useful to be able to find out early and stop processing
   the request on the server.
   
   It turns out there is no easy way to detect if a passive mode socket is closed
   in Erlang/OTP [1]. Neither one of inet:monitor/1, inet:info/1, inet:getstat/1
   work. However, it is possible to do it by querying the TCP state info of the
   socket. That option available in Linux since kernel 2.4 and on other Unix-like
   OSes (NetBSD, OpenBSD, FreeBSD and MacOS). Windows also has a tcp info query
   method however it is not reacheable via the gensockopts(2) standard socket API,
   so it can't be queried from Erlang's inet:getopts/2 API.
   
   [1] Using the newer socket module it's possible to detect if a socket is closed
   by attempting a recv with a MSG_PEEK option. However, the regular gen_tcp OTP
   module doesn't have a recv() variant which takes extra options. In addition,
   the new socket implementation still feels rather experimental. (It's not the
   default even in the latest OTP 26 release).

   

   nickva committed Aug 31, 2023
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