Only allowing it to be passed directly makes it hard to combine plain
(i.e. starttls) and Direct TLS connections in the same connection
resolution procedure. But now we can, using chained resolvers!
With opportunistic writes enabled, writes can return what :onwritable()
returns, thus :onwritable() should return something sensible at each
spot.
Should prevent whatever caused
> Error writing to connection: (nil)
Tho this was probably harmless
If the connection is closed by the peer, any buffered data is given a
last chance to be sent (see f27b9319e0da). If the connection is Really
closed, no attempt to write will occur, instead epoll will raise the
error flag and :onreadable() will be invoked again, where it will try to
:close() again for the same reason, thus looping until the connection
somehow gets destroyed.
By clearing the _connected flag, the second time it passes :onreadable()
it should go directly to :destroy(), breaking the loop.
Thanks Link Mauve for reporting
ff4e34c448a4 broke the way net.http.server streams downloads from disk
because it made writes from the ondrain callback no longer reset the
want-write flag, causing the download to halt.
Writes from the predrain handler still must not trigger anything but
additions to the buffer, since it is about to do all the socket writing
already.
Previously it would only say "unable to resolve server" for all DNS
problems. While "NoError in A lookup" might not make much sense to
users, it should help in debugging more than the previous generic error.
Friendlier errors will be future work.
This is not a pretty way to signal this... but it is the current API
interface:inittls() is a new code path which did not go past the point
in interface:starttls() where it set starttls to false, leading mod_tls
to offer starttls on direct TLS connections
Thanks Martin for discovering.
The intent is to ensure 'ondisconnect' only gets called once, while
giving buffered outgoing data a last chance to be delivered via the
:close() path in case the connection was only shutdown in one direction.
Before 22825cb5dcd8 connection attempts that failed (e.g. connection
refused) would be immediately destroyed. After, it would schedule
another write cycle and then report 'ondisconnect' again when failing.
Thanks Martin for reporting
Instead try to write any remaining buffered data. If the write attempt
also fails with "closed" then there's nothing we can do and the socket
is gone.
This reverts what appears to be a mistakenly included part of c8aa66595072
Thanks jonas’ for noticing
Previously it was unclear whether "client port" was the port that the
client connected to, or from. I hereby declare that the client port is
the source port and the server port is the destination port.
Incoming and outgoing connections can be distinguished by looking at
the_server reference, which only incoming connections have.
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.
To be removed in the future, but not right now. Give the log warning a
chance to prod anyone who might have network_backend="select" in their
config first.
There's also things built on Verse which uses server_select.lua, which
will need to be updated somehow.
Previously it would have gone for server_select if util.poll was for
some reason not available, which should be never these days. And even if
it was, best to flush it out by throwing loud errors so users notice.
Then they can work around it by using select until we delete that one.
Fixes that selecting libevent when unavaibalbe would fall back to select
instead of epoll, even if that's available.
This way, we only have to update it in once place when choosing a new
default.
Previously, if surrounding code was not configuring the TLS context
used default in net.http, it would not validate certificates at all.
This is not a security issue with prosody, because prosody updates the
context with `verify = "peer"` as well as paths to CA certificates in
util.startup.init_http_client.
Nevertheless... Let's not leave this pitfall out there in the open.
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.
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.
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.
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
