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2019-09-14qspawn: remove unused WNOHANG import
We rely on DS to do waitpid with WNOHANG, now, and the non-DS code path won't use WNOHANG.
2019-09-14httpd/async: improve naming and comments
Rename the {cleanup} field to {end}, since it's similar to END {} and is consistent with the variable in Qspawn.pm And document how certain subs get called, since we have many subs named "new" and "close".
2019-09-14githttpbackend: use REMOTE_ADDR for deleted identifier
REMOTE_HOST is not set by us (it is the reverse DNS name) of REMOTE_ADDR, and there's few better ways to kill HTTP server performance than to use standard name resolution APIs like getnameinfo(3).
2019-09-14tmpfile: support O_APPEND and use it in DS::tmpio
Might as well share some code for temporary file creation
2019-09-14tmpfile: give temporary files meaningful names
Although we always unlink temporary files, give them a meaningful name so that we can we can still make sense of the pre-unlink name when using lsof(8) or similar tools on Linux.
2019-09-14qspawn: simplify by using PerlIO::scalar
I didn't know PerlIO::scalar existed until a few months ago, but it's been distributed with Perl since 5.8 and doesn't seem to be split out into it's own package on any distro.
2019-09-14admin: warn and ignore inaccessible inboxes
For whatever reason, inbox directories can go missing temporarily or permanently. Tell the admin about them and continue on our way.
2019-09-12solvergit: don't drop update-index stdin with qspawn
It's possible for Qspawn callers to be deferred, in which case we must ensure we don't cause the temporary file used for stdin to become unref-ed and closed. This can be a problem when we exceed the default Qspawn limiter of 32 concurrent processes for "git update-index".
2019-09-09run update-copyrights from gnulib for 2019
2019-09-08nntp: regexp always consumes rbuf if "\n" exists
We don't want to get hung into a state where we see "\n" via index(), yet cannot consume rbuf in the while loop. So tweak the regexp to ensure we always consume rbuf. I suspect this is what causes occasional 100% CPU usage of -nntpd, but reproducing it's been difficult..
2019-09-08nntp: fix redundant CRLF from "LISTGROUP GROUP RANGE"
Since Net::NNTP::listgroup doesn't support the range parameter, I had to test this manually and noticed extra CRLF were emitted.
2019-07-14nntpdeflate: reduce overhead of idle clients
We don't need to keep an empty buffer around in the common case when a client is sending us completely inflatable requests and we're able to read them in one go. This only seems to save about 2M with 10K NNTPS clients using COMPRESS, so it's not a huge win, but better than nothing.
2019-07-13nntp: support optional [range] arg in LISTGROUP
RFC3977 6.1.2.2 LISTGROUP allows a [range] arg after [group], and supporting it allows NNTP support in neomutt to work again. Tested with NeoMutt 20170113 (1.7.2) on Debian stretch (oldstable)
2019-07-13nntp: fix LIST OVERVIEW.FMT ordering and format
RFC3977 8.4.2 mandates the order of non-standard headers to be after the first seven standard headers/metadata; so "Xref:" must appear after "Lines:"|":lines". Additionally, non-required header names must be followed by ":full". Cc: Jonathan Corbet <corbet@lwn.net> Reported-by: Urs Janßen <E1hmKBw-0008Bq-8t@akw>
2019-07-13nntpdeflate: stop relying on SUPER for ->do_read
We won't need further layering after enabling compression. So be explicit about which sub we're calling when we hit ->do_read from NNTP and eliminate the need for the comment.
2019-07-12nntp: clear local timer on idle client expiry
We need to ensure further timers can be registered if there's currently no idle clients.
2019-07-10http|nntp: avoid recursion inside ->write
In HTTP.pm, we can use the same technique NNTP.pm uses with long_response with the $long_cb callback and avoid storing $pull in the per-client structure at all. We can also reuse the same logic to push the callback into wbuf from NNTP. This does NOT introduce a new circular reference, but documents it more clearly.
2019-07-10solver: remove redundant spawn imports
We're using Qspawn, now
2019-07-08http|nntp: "use PublicInbox::DS" instead of ->import
Relying on "use" to import during BEGIN means we get to take advantage of prototype checking of function args during the rest of the compilation phase.
2019-07-08httpd: (cleanup) use reference instead of *glob
*glob notation isn't always necessary, and there's no need to disable 'once' warnings, this way.
2019-07-08daemon: use POSIX and WNOHANG more idiomatically
No point in uglifying our code since we need the POSIX module in many places, anyways.
2019-07-08Merge remote-tracking branch 'origin/nntp-compress'
* origin/nntp-compress: nntp: improve error reporting for COMPRESS nntp: reduce memory overhead of zlib nntp: support COMPRESS DEFLATE per RFC 8054 nntp: move LINE_MAX constant to the top nntp: use msg_more as a method
2019-07-08ds: use WNOHANG with waitpid if inside event loop
While we're usually not stuck waiting on waitpid after seeing a pipe EOF or even triggering SIGPIPE in the process (e.g. git-http-backend) we're reading from, it MAY happen and we should be careful to never hang the daemon process on waitpid calls. v2: use "eq" for string comparison against 'DEFAULT'
2019-07-07nntp: improve error reporting for COMPRESS
Add some checks for errors at initialization, though there's not much that can be done with ENOMEM-type errors aside from dropping clients. We can also get rid of the scary FIXME for MemLevel=8. It was a stupid error on my part in the original per-client deflate stream implementation calling C::R::Z::{Inflate,Deflate} in array context and getting the extra dualvar error code as a string result, causing the {zin}/{zout} array refs to have extra array elements.
2019-07-06nntp: reduce memory overhead of zlib
Using Z_FULL_FLUSH at the right places in our event loop, it appears we can share a single zlib deflate context across ALL clients in a process. The zlib deflate context is the biggest factor in per-client memory use, so being able to share that across many clients results in a large memory savings. With 10K idle-but-did-something NNTP clients connected to a single process on a 64-bit system, TLS+DEFLATE used around 1.8 GB of RSS before this change. It now uses around 300 MB. TLS via IO::Socket::SSL alone uses <200MB in the same situation, so the actual memory reduction is over 10x. This makes compression less efficient and bandwidth increases around 45% in informal testing, but it's far better than no compression at all. It's likely around the same level of compression gzip gives on the HTTP side. Security implications with TLS? I don't know, but I don't really care, either... public-inbox-nntpd doesn't support authentication and it's up to the client to enable compression. It's not too different than Varnish caching gzipped responses on the HTTP side and having responses go to multiple HTTPS clients.
2019-07-06nntp: support COMPRESS DEFLATE per RFC 8054
This is only tested so far with my patches to Net::NNTP at: https://rt.cpan.org/Ticket/Display.html?id=129967 Memory use in C10K situations is disappointing, but that's the nature of compression. gzip compression over HTTPS does have the advantage of not keeping zlib streams open when clients are idle, at the cost of worse compression.
2019-07-06nntp: move LINE_MAX constant to the top
It'll be accessible from other places, and there was no real point in having it declared inside a sub.
2019-07-06nntp: use msg_more as a method
It's a tad slower, but we'll be able to subclass this to rely on zlib deflate buffering. This is advantageous for TLS clients since (AFAIK) IO::Socket::SSL/OpenSSL doesn't give us ways to use MSG_MORE or writev(2) like like GNUTLS does.
2019-07-06watch: allow multiple spam watch directories
Given most folks have multiple mail accounts, there's no reason we can't support multiple Maildirs.
2019-07-06watch: remove some indirectly-used imports
We can drop some unnecessary imports and now that we switched to InboxWritable.
2019-07-05viewdiff: do not anchor using diffstat comments
Diffstat summary comments were added to git last year and we need to filter them out to get anchors working properly. Reported-by: SZEDER Gábor <szeder.dev@gmail.com> https://public-inbox.org/meta/20190704231123.GF20404@szeder.dev/
2019-07-04qspawn: retry sysread when parsing headers, too
We need to ensure the BIN_DETECT (8000 byte) check in ViewVCS can be handled properly when sending giant files. Otherwise, EPOLLET won't notify us, again, and responses can get stuck. While we're at it, bump up the read-size up to 4096 bytes so we make fewer trips to the kernel.
2019-06-30nntp: add support for CAPABILITIES command
Some clients may rely on this for STARTTLS support.
2019-06-30nntp: remove DISABLED hash checks
Before I figured out the long_response API, I figured there'd be expensive, process-monopolizing commands which admins might want to disable. Nearly 4 years later, we've never needed it and running a server without commands such as OVER/XOVER is unimaginable.
2019-06-30daemon: warn on inheriting blocking listeners
For users relying on socket activation via service manager (e.g. systemd) and running multiple service instances (@1, @2), we need to ensure configuration of the socket is NonBlocking. Otherwise, service managers such as systemd may clear the O_NONBLOCK flag for a small window where accept/accept4 blocks: public-inbox-nntpd@1 |systemd |public-inbox-nntpd@2 --------------------------+----------------+-------------------- F_SETFL,O_NONBLOCK|O_RDWR | | (not running, yet) |F_SETFL, O_RDWR | |fork+exec @2... | accept(...) # blocks! | |(started by systemd) | |F_SETFL,O_NONBLOCK|O_RDWR | |accept(...) non-blocking It's a very small window where O_NONBLOCK can be cleared, but it exists, and I finally hit it after many years.
2019-06-30Merge remote-tracking branch 'origin/email-simple-mem' into master
* origin/email-simple-mem: nntp: reduce syscalls for ARTICLE and BODY mbox: split header and body processing mbox: use Email::Simple->new to do in-place modifications nntp: rework and simplify art_lookup response
2019-06-30ds: fix return values of do_read and *_tls_step
We need to ensure all these subroutines return false on incomplete.
2019-06-30ds: rely on refcounting to close descriptors
Since we have EPOLL_CTL_DEL implemented for the poll(2) and kqueue backends, we can rely on Perl refcounting to gently close(2) the underlying file descriptors as references get dropped. This may be beneficial in the future if we want to drop a descriptor from the event loop without actually closing it.
2019-06-29dskqxs: more closely match epoll semantics
EV_DISPATCH is actually a better match for EPOLLONESHOT semantics than EV_ONESHOT in that it doesn't require EV_ADD for every mod operation. Blindly using EV_ADD everywhere forces the FreeBSD kernel to do extra allocations up front, so it's best avoided.
2019-06-29http: use bigger, but shorter-lived buffers for pipes
Linux pipes default to 65536 bytes in size, and we want to read external processes as fast as possible now that we don't use Danga::Socket or buffer to heap. However, drop the buffer ASAP if we need to wait on anything; since idle buffers can be idle for eons. This lets other execution contexts can reuse that memory right away.
2019-06-29httpd/async: switch to buffering-as-fast-as-possible
With DS buffering to a temporary file nowadays, applying backpressure to git-http-backend(1) hurts overall memory usage of the system. Instead, try to get git-http-backend(1) to finish as quickly as possible and use edge-triggered notifications to reduce wakeups on our end.
2019-06-29parentpipe: make the ->close call more obvious
We can close directly in event_step without bad side effects, and then we also don't need to take a reason arg from worker_quit, since we weren't logging it anywhere.
2019-06-29parentpipe: document and use one-shot wakeups
The master process only dies once and we close ourselves right away. So it doesn't matter if it's level-triggered or edge-triggered, actually, but one-shot is most consistent with our use and keeps the kernel from doing extra work.
2019-06-29http: support HTTPS (kinda)
It's barely any effort at all to support HTTPS now that we have NNTPS support and can share all the code for writing daemons. However, we still depend on Varnish to avoid hug-of-death situations, so supporting reverse-proxying will be required.
2019-06-29ds: consolidate IO::Socket::SSL checks
We need to be careful about handling EAGAIN on write(2) failures deal with SSL_WANT_READ vs SSL_WANT_WRITE as appropriate.
2019-06-29ds: handle deferred DS->close after timers
Our hacks in EvCleanup::next_tick and EvCleanup::asap were due to the fact "closed" sockets were deferred and could not wake up the event loop, causing certain actions to be delayed until an event fired. Instead, ensure we don't sleep if there are pending sockets to close. We can then remove most of the EvCleanup stuff While we're at it, split out immediate timer handling into a separate array so we don't need to deal with time calculations for the event loop.
2019-06-29listener: use edge-triggered notifications
We don't need extra wakeups from the kernel when we know a listener is already active.
2019-06-29http: use requeue instead of watch_in1
Don't use epoll or kqueue to watch for anything unless we hit EAGAIN, since we don't know if a socket is SSL or not.
2019-06-29ds: move requeue logic over from NNTP
We'll be reusing requeue in other places to reduce trips to the kernel to retrieve "hot" descriptors.
2019-06-29ds: share lazy rbuf handling between HTTP and NNTP
Doing this for HTTP cuts the memory usage of 10K idle-after-one-request HTTP clients from 92 MB to 47 MB. The savings over the equivalent NNTP change in commit 6f173864f5acac89769a67739b8c377510711d49, ("nntp: lazily allocate and stash rbuf") seems down to the size of HTTP requests and the fact HTTP is a client-sends-first protocol where as NNTP is server-sends-first.