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author | Eric Wong <e@80x24.org> | 2017-03-08 04:56:46 +0000 |
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committer | Eric Wong <e@80x24.org> | 2017-03-08 05:39:55 +0000 |
commit | 873218e317773462be2a72556d26dc4a723cc7be (patch) | |
tree | d51829f7830eca74d90325822a7a5a0e9514cee2 | |
parent | 8ce88a3756b110e5e3001f640ebd53a5b11d8c65 (diff) | |
download | unicorn-873218e317773462be2a72556d26dc4a723cc7be.tar.gz |
Ruby 2.2+ can show "struct tcp_info" as a string via Socket::Option#inspect, and we can attempt to parse it out to extract the information we need. Parsing this string is inefficient, but does not depend on the ordering of the tcp_info struct.
-rw-r--r-- | lib/unicorn/http_request.rb | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/lib/unicorn/http_request.rb b/lib/unicorn/http_request.rb index 68bde16..c08097c 100644 --- a/lib/unicorn/http_request.rb +++ b/lib/unicorn/http_request.rb @@ -29,6 +29,7 @@ class Unicorn::HttpParser EMPTY_ARRAY = [].freeze @@input_class = Unicorn::TeeInput @@check_client_connection = false + @@tcpi_inspect_ok = true def self.input_class @@input_class @@ -127,8 +128,37 @@ class Unicorn::HttpParser end end else + + # Ruby 2.2+ can show struct tcp_info as a string Socket::Option#inspect. + # Not that efficient, but probably still better than doing unnecessary + # work after a client gives up. def check_client_connection(socket) # :nodoc: - write_http_header(socket) + if Unicorn::TCPClient === socket && @@tcpi_inspect_ok + opt = socket.getsockopt(:IPPROTO_TCP, :TCP_INFO).inspect + if opt =~ /\bstate=(\S+)/ + @@tcpi_inspect_ok = true + raise Errno::EPIPE, "client closed connection".freeze, + EMPTY_ARRAY if closed_state_str?($1) + else + @@tcpi_inspect_ok = false + write_http_header(socket) + end + opt.clear + else + write_http_header(socket) + end + end + + def closed_state_str?(state) + case state + when 'ESTABLISHED' + false + # not a typo, ruby maps TCP_CLOSE (no 'D') to state=CLOSED (w/ 'D') + when 'CLOSE_WAIT', 'TIME_WAIT', 'CLOSED', 'LAST_ACK', 'CLOSING' + true + else + false + end end end |