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Integer comparisions of "$!" are faster than hash lookups.
See commit 6fa2b29fcd0477d126ebb7db7f97b334f74bbcbc
("ds: cleanup Errno imports and favor constant comparisons")
for benchmarks.
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We don't need to keep track of that field since we always
know what events we're interested in when using one-shot
wakeups.
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We can avoid the EPOLL_CTL_ADD && EPOLL_CTL_MOD sequence with
a single EPOLL_CTL_ADD.
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No sense in having similar Linux-specific functionality in
both our NNTP.pm and HTTP.pm
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We don't need write buffering unless we encounter slow clients
requesting large responses. So don't waste a hash slot or
(empty) arrayref for it.
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All of our internal timing code should use monotonic clocks
for consistency against system clock adjustments.
This can be shared by our Daemon and NNTP packages.
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Merely checking the presence of the {sock} field is
enough, and having multiple sources of truth increases
confusion and the likelyhood of bugs.
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Having separate read/write callbacks in every class is too
confusing to my easily-confused mind. Instead, give every class
an "event_step" callback which is easier to wrap my head around.
This will make future code to support IO::Socket::SSL-wrapped
sockets easier-to-digest, since SSL_write() can require waiting
on POLLIN events, and SSL_read() can require waiting on POLLOUT
events.
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* origin/ds:
ds: stop caring about event flags set by epoll/poll/kqueue
ds: do not distinguish between POLLHUP and POLLERR
ds: remove read method, here, too
nntp: use sysread to append to existing buffer
ds: remove steal_socket method
ds: remove {fd} field
ds: reduce Errno imports and drop ->close reason
ds: cleanup Errno imports and favor constant comparisons
ds: simplify write buffer accounting
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It's the unfortunate reality that there are some clients which
reuse Message-IDs (in which we generate + use another) or set
multiple Message-IDs on their own. While the v2 format
addresses that, NNTP clients such as leafnode are not always
prepared to deal with that case.
So, ensure NNTP clients only see a single Message-ID, and
show the others as 'X-Alt-Message-ID'.
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Leafnode cannot handle Message-ID headers which are too long and
require folding via Email::Simple::Header. Since there are
already many of these messages in git with the header already
folded, we need to handle the unfolding when emitting the
message via NNTP.
As far as we know, Leafnode is the only client software
incapable of handling this case.
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Apparently leafnode just needs any junk in the Path: header.
Lets not waste bandwidth and just use a single byte to keep
leafnode happy.
Cc: Dave Taht <dave@taht.net>
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In my experience, both are worthless as any normal read/write
call path will be wanting to check errors and deal with them
appropriately; so we can just call event_read, for now.
Eventually, there'll probably be only one callback for dealing
with all in/out/err/hup events to simplify logic, especially w.r.t
TLS socket negotiation.
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We already do this in PublicInbox::HTTP, as it's superior to
DS::read in this regard. Initially (when I started writing
NNTP.pm, I wanted to use Danga::Socket's read buffering and
push_back_read (removed in DS) but quickly figured out it wasn't
useful at all for dealing with trickling clients.
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Storing the file descriptor was redundant as we can quickly call
fileno($self->{sock}) and not have to store an extra hash table
entry. Multiple sources of truth leads to confusion, confusion
leads to bugs.
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Keeping track of write_buf_size was redundant and pointless when
we can simply check the number of elements in the buffer array.
Multiple sources of truth leads to confusion; confusion leads to
bugs.
Finally, rename the prefixes to 'wbuf' to ensure we loudly
(instead of silently) break any external dependencies being
ported over from Danga::Socket, as further changes are pending.
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RFC3977 does not have provisions for whitespace beyond ASCII
TAB, SP, CR and LF. I doubt there's any NNTP clients broken
enough to be sending non-ASCII whitespace delimiters.
We're probably excessively liberal regarding TAB acceptance,
even; but it's probably too late to change at this point...
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We aren't able to make sense of non-ASCII digits
cf. perlrecharclass(1) / "Digits" section
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None of the NNTP code actually relies on Xapian, anymore.
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* origin/danga-bundle:
DS: epoll: fix misordered EPOLL_CTL_DEL call
DS: drop unused "_undef" sub
syscall: drop readahead wrapper
build: do not manify DS and Syscall pods
DS: handle EINTR in IO::Poll path, too
DS: workaround IO::Kqueue EINTR (mis-)handling
DS: drop profiling support
DS: remove unused fields and functions
listener: use EPOLLEXCLUSIVE for listen sockets
bundle Danga::Socket and Sys::Syscall
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We'll ignore blank lines from clients, since that's what innd
seems to do.
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These modules are unmaintained upstream at the moment, but I'll
be able to help with the intended maintainer once/if CPAN
ownership is transferred. OTOH, we've been waiting for that
transfer for several years, now...
Changes I intend to make:
* EPOLLEXCLUSIVE for Linux
* remove unused fields wasting memory
* kqueue bugfixes e.g. https://rt.cpan.org/Ticket/Display.html?id=116615
* accept4 support
And some lower priority experiments:
* switch to EV_ONESHOT / EPOLLONESHOT (incompatible changes)
* nginx-style buffering to tmpfile instead of string array
* sendfile off tmpfile buffers
* io_uring maybe?
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Unused since commit b8c41362f2a5c8fcc6b1846a79c72bfa77565297
("nntp: simplify the long_response API")
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Alpine is apparently stricter than other clients I've tried
w.r.t. using CRLF for headers. So do the same thing we do for
bodies to ensure we only emit CRLFs and no bare LFs.
Reported-by: Wang Kang <i@scateu.me>
https://public-inbox.org/meta/alpine.DEB.2.21.99.1901161043430.29788@la.scateu.me/
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do_write must return 0 or 1.
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When a client starts pipelining requests to us which trigger
long responses, we need to keep socket readiness checks disabled
and only enable them when our socket rbuf is drained.
Failure to do this caused aborted clients with
"BUG: nested long response" when Danga::Socket calls event_read
for read-readiness after our "next_tick" sub fires in the
same event loop iteration.
Reported-by: Jonathan Corbet <corbet@lwn.net>
cf. https://public-inbox.org/meta/20181013124658.23b9f9d2@lwn.net/
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Putting the Xref field into xover lines allows newsreaders to mark
cross-posted messages read when catching up a group. That, in turn,
massively improves the life of crazy people who try to follow dozens of
kernel lists, where emails are often heavily cross-posted.
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RFC 5536 sec 3.2.14 says that the server-name in an Xref line is "which
news server generated the header field"; indeed, that is necessary for
newsreaders like gnus to handle references properly. So pick up the server
name from the config if available (the first name if there's more than
one), from the host name otherwise, and use it rather than the domain
name of the list server.
Tests have been adjusted to match the new behavior.
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* origin/master:
nntp: allow and ignore empty commands
mbox: do not barf on queries which return no results
nntp: fix NEWNEWS command
searchview: fix non-numeric comparison
Allow specification of the number of search results to return
githttpbackend: avoid infinite loop on generic PSGI servers
http: fix modification of read-only value
extmsg: use news.gmane.org for Message-ID lookups
extmsg: rework partial MID matching to favor current inbox
Update the installation instructions with Fedora package names
nntp: do not drain rbuf if there is a command pending
nntp: improve fairness during XOVER and similar commands
searchidx: do not modify Xapian DB while iterating
Don't use LIMIT in UPDATE statements
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Somebody hitting "\n" into telnet shouldn't hold a client up
indefinitely and prevent shutdown.
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Since we only query the SQLite over DB for OVER/XOVER; do not
need to waste space storing fields To/Cc/:bytes/:lines or the
XNUM term. We only use From/Subject/References/Message-ID/:blob
in various places of the PSGI code.
For reindexing, we will take advantage of docid stability
in "xapian-compact --no-renumber" to ensure duplicates do not
show up in search results. Since the PSGI interface is the
only consumer of Xapian at the moment, it has no need to
search based on NNTP article number.
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Noted by Jonathan Corbet in https://lwn.net/Articles/748184/
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We we worked around the default range/termination conditions of
long_response in many cases to reduce calls to SQLite or Xapian.
So continue that trend and become more like the PSGI API
which doesn't force callers to specify an article range or
work inside a loop.
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id_batch had a an overly complicated interface, replace it
with id_batch which is simpler and takes advantage of
selectcol_arrayref in DBI. This allows simplification of
callers and the diffstat agrees with me.
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While SQLite is faster than Xapian for some queries we
use, it sucks at handling OFFSET. Fortunately, we do
not need offsets when retrieving sorted results and
can bake it into the query.
For inbox.comp.version-control.git (v1 Xapian),
XOVER and XHDR are over 20x faster.
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I guess nobody uses this command (slrnpull does not), and
the breakage was not noticed until I started writing new
tests for multi-MID handling.
Fixes: 3fc411c772a21d8f ("search: drop pointless range processors for Unix timestamp")
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This ought to provide better performance and scalability
which is less dependent on inbox size. Xapian does not
seem optimized for some queries used by the WWW homepage,
Atom feeds, XOVER and NEWNEWS NNTP commands.
This can actually make Xapian optional for NNTP usage,
and allow more functionality to work without Xapian
installed.
Indexing performance was extremely bad at first, but
DBI::Profile helped me optimize away problematic queries.
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Some clients pipeline requests aggressively (enough to match
LINE_MAX) and we should not read from the client socket until we
know there's no pending command in our read buffer.
Reported-and-tested-by: Sergey Organov <sorganov@gmail.com>
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For other commands generating long responses, we generally want
to yield to another client after emitting 100 . However,
XOVER-based responses already query 200 lines worth of responses
at a time, so we were sending 20000 lines before yielding to
other clients. This may help avoid timeouts for some clients.
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I guess nobody uses this command (slrnpull does not), and
the breakage was not noticed until I started writing new
tests for multi-MID handling.
Fixes: 3fc411c772a21d8f ("search: drop pointless range processors for Unix timestamp")
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Since Message-IDs are no longer unique within Xapian
(but are within the SQLite Msgmap); favor NNTP article
numbers for internal lookups. This will prevent us
from finding the "wrong" internal Message-ID.
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Using update-copyrights from gnulib
While we're at it, use the SPDX identifier for AGPL-3.0+ to
ease mechanical processing.
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There's no need to use strftime if we'll be converting the date
by hand, anyways.
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This clarifies the code somewhat, and we don't care to lazy-load
in NNTP.pm anyways since this is only used for a long-lived
daemon.
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Based on reading RFC 3986, it seems '@', ':', '!', '$', '&',
"'", '; '(', ')', '*', '+', ',', ';', '=' are all allowed
in path-absolute where we have the Message-ID.
In any case, it seems '@' is fairly common in path components
nowadays and too common in Message-IDs.
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Callers may have localized $/ to something else, so make sure
we chomp the expected character(s) when calling chomp.
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Danga::Socket::write will set the closed flag on a socket,
automatically, and we do not need to bring down an entire
server when one client breaks the connection :P
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This fixes some layering violations and consolidates
the cleanup into the inbox object itself. Keeping in
mind weakening does not work at all without our PSGI
server.
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This avoids breaking clients on graceful shutdown since
NNTP responses should usually be quick.
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This ought to make things easier when we add TLS support.
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