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In a case like this the timer would not be readded:
addtimer(1, function(t, id)
stop(id)
return 1
end);
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Likely affected rescheduling but have no reports of this.
After readding a timer, it would have been issued a new id. Rescheduling
would use the previous id, thus not working.
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Thanks tmolitor
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Only relevant because a "dirty" connection (with incoming data in
LuaSocket's buffer) does not count as "readable" according to epoll, so
special care needs to be taken to keep on processing it.
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Allows sneaking in things in the write buffer just before it's sent to
the network stack. For example ack requests, compression flushes or
other things that make sense to send after stanzas or other things.
This ensures any additional trailing data sent is included in the same
write, and possibly the same TCP packet. Other methods used such as
timers or nextTick might not have the same effect as it depends on
scheduling.
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Should prevent further opportunistic write attempts after the kernel
buffers are full and stops accepting writes.
When combined with `keep_buffers = false` it should stop it from
repeatedly recreating the buffer table and concatenating it back into a
string when there's a lot to write.
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Caused "attempt to index a string value (local 'data')", but only if
keep_buffers is set to false, which is not the default.
Introduced in 917eca7be82b
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Read and write timeouts should usually match whether we want to read or
write.
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Should avoid rare but needless timer interactions
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Instead of removing and readding the timer, keep it and adjust it
instead. Should reduce garbage production a bit.
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Only real difference between the read and write timeouts is that the
former has a callback that allows the higher levels to keep the
connection alive, while hitting the later is immediately fatal. We want
the later behavior for TLS negotiation.
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Saves a function call. I forget if I measured this kind of thing but
IIRC infix concatenation is faster than a function call up to some
number of items, but let's stop at 2 here.
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writebuffer is now string | { string }
Saves the allocation of a buffer table until the second write, which
could be rare, especially with opportunistic writes.
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Reusing an already existing buffer table would reduce garbage, but
keeping it while idle is a waste.
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So that if a write ends up writing directly to the socket, it gets the
actual return value
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A timeout value less than 0.001 gets turned into zero on the C side, so
epoll_wait() returns instantly and essentially busy-loops up to 1ms,
e.g. when a timer event ends up scheduled (0, 0.001)ms into the future.
Unsure if this has much effect in practice, but it may waste a small
amount of CPU time. How much would depend on how often this ends up
happening and how fast the CPU gets trough main loop iterations.
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Nagle increases latency and is the bane of all networking!
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Activated by setting config.tcp_keepalive to a number, in seconds.
Defaults to 2h.
Depends on LuaSocket support for this option.
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In case one wishes to enable this for all connections, not just c2s
(not Direct TLS ones, because LuaSec) and s2s. Unclear what use these
are, since they kick in after 2 hours of idle time.
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Good to know if it fails, especially since the return value doesn't seem
to be checked anywhere.
Since LuaSec-wrapped sockets don't expose the setoption method, this
will likely show when mod_c2s tries to enable keepalives on direct tls
connections.
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Skips a roundtrip through the main loop in case client-first data is
available already, if not then :onreadable() will set the appropriate
timeout.
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There's the theory that the socket isn't the same before/after wrap(),
but since epoll operates on FD numbers this shouldn't matter.
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The :init() method sets a different timeout than the TLS related methods.
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Since TLS is a client-first protocol there is a chance that the
ClientHello message is available already. TLS Fast Open and/or the
TCP_DEFER_ACCEPT socket option would increase that chance.
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So there's :startls(), :inittls() and :tlshandshake()
:starttls() prepares for plain -> TLS upgrade and ensures that the
(unencrypted) write buffer is drained before proceeding.
:inittls() wraps the connection and does things like SNI, DANE etc.
:tlshandshake() steps the TLS negotiation forward until it completes
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net.http.files serving a big enough file on a fast enough connection
with opportunistic_writes enabled could trigger a stack overflow through
repeatedly serving more data that immediately gets sent, draining the
buffer and triggering more data to be sent. This also blocked the server
on a single task until completion or an error.
This change prevents nested opportunistic writes, which should prevent
the stack overflow, at the cost of reduced download speed, but this is
unlikely to be noticeable outside of Gbit networks. Speed at the cost of
blocking other processing is not worth it, especially with the risk of
stack overflow.
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This may speed up client-first protocols (e.g. XMPP, HTTP and TLS) when
the first client data already arrived by the time we accept() it.
If LuaSocket supported TCP_DEFER_ACCEPT we could use that to further
increase the chance that there's already data to handle.
In case no data has arrived, no harm should be done, :onreadable would
simply set the read timeout and we'll get back to it once there is
something to handle.
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The :init method is more suited for new outgoing connections, which is
why it uses the connect_timeout setting.
Depending on whether a newly accepted connection is to a Direct TLS port
or not, it should be handled differently, and was already. The :starttls
method sets up timeouts on its own, so the one set in :init was not needed.
Newly accepted plain TCP connections don't need a write timeout set, a
read timeout is enough.
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This should make sure that if there's data left to be written when
closing a connection, there's also a timeout so that it doesn't wait
forever.
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Supported by the other net.server implementations already, but not used
anywhere in Prosody.
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If the underlying TCP connection times out before the write timeout
kicks in, end up here with err="timeout", which the following code
treats as a minor issue.
Then, due to epoll apparently returning the EPOLLOUT (writable) event
too, we go on and try to write to the socket (commonly stream headers).
This fails because the socket is closed, which becomes the error
returned up the stack to the rest of Prosody.
This also trips the 'onconnect' signal, which has effects on various
things, such as the net.connect state machine. Probably undesirable
effects.
With this, we instead return "connection timeout", like server_event,
and destroy the connection handle properly. And then nothing else
happens because the connection has been destroyed.
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Not sure why these were here to begin with, since it does use the 'self'
argument and did so since they were added.
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This makes sure that a timer that returns 0 (or less) does not prevent
runtimers() from completing, as well as making sure a timer added with
zero timeout from within a timer does not run until the next tick.
Thanks tmolitor
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Partial backports of the following commits from trunk:
6c804b6b2ca2 net.http: Pass server name along for SNI (fixes #1408)
75d2874502c3 net.server_select: SNI support (#409)
9a905888b96c net.server_event: Add SNI support (#409)
adc0672b700e net.server_epoll: Add support for SNI (#409)
d4390c427a66 net.server: Handle server name (SNI) as extra argument
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Some lines seem to have gotten the wrong indentation, possibly caused by
Meld which often ignores lines with only whitespace changes and leaves
their previous indentation.
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#1388)
The previous timer handling did not scale well and led to high CPU usage
with many connections (each with at least an read timeout).
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It's an error, it should be logged at error level.
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It's confusingly quiet otherwise, even with maximum verboseness.
Thanks perflyst
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Might improve (CPU) performance at the risk of triggering top level
errors.
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This lets plugins handle errors in some custom way, should they wish to.
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