5.2.0 doc polish

See merge request !1087

Reimplement map()

Closes #620 and #554

See merge request !1000

Error handling inside the test was incorrent and a detected error would
blow up the test routine.

Related: !1011, 3f5a826d

We don't have leader instance anymore, so each instance independently
provides Graphite statistics.

This commit also changes default Graphite prefix to solve problem
with conflicting instance names.

It now contains either content of SYSTEMD_INSTANCE environment variable
or stringified version of getpid() value.

Main motivation is that the old worker.id was broken on systemd,
i.e. the default installation.

Related: #631

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Fixup for c0b5faf2.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

We don't have leader instance anymore, so any instance can provide
Prometheus statistics.

For performance reasons an instance does not store past statistics
when no client is connected to HTTP socket. As a consequence chart in
web interface is empty when client loads the page and then gradually
chart fills up.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Obviously this is is racy and cannot be relied upon.
Caller still has to handle connection errors.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

New map() creates control/ sockets in current working directory so it
pollutes worktree when developers run it in worktree.

I've also added files with ephemeral certificates and pytests test report
which were missing as well.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Three instances send commands and DNS queries to each other.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Control protocol uses \n as command delimiter so we cannot allow \n
inside commands. Users should be able to Lua-escape \n with \010.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Typical example of unrepresentable message is a Lua error.
E.g. error() called from kresc would lead to NULL message.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

For now we still attempt to support systems without lua-cqueues,
e.g. Ubuntu 16.04.

lua-http depends on lua-cqueues so the test for availability of lua-http
at the beginning of kr_https_fetch() should cover lua-cqueues as well.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

We were exceeding CI time limit while running config tests under
Valgrind so let's see if smaller number of tests will get us through CI.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

map() command on leader instance now:
- detects call errors on followers
- detects unsupported number of return values
- detects unsupported data types which cannot be serialized
- keeps nil return values (signaled by table counter "n")

Fixes: #662

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Let's detect syntax errors before sending the command to all instances.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Helper functions for handling variable length arrays with nil values.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

map() now depends on presence of control sockets, and by default config
tests are executed with KRESD_NO_LISTEN=1 env var which prevents control
sockets from being created. Tests for features which depend on map() now
explicitly create their own control socket.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Previously exit trap executed command "kill -9" even if there were no
leftover processes and this lead to clutter in logs because kill
complained about missing arguments.

As a bonus the cleanup routine now prints information about leftover
processes.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Reasons:
- It allows to run several kresd instances and use map() without
  worrying about instance parameters.
- It removes special case from map().

Proper functionality depends on changes in MR !1011.

Petr Špaček authored 4 years ago and Tomas Krizek committed 4 years ago

Serializes: boolean, nil, number, string, table.
Skips all other types (functions, cdata, thread ...) and repeated
references to tables.

Resulting string should Lua-evaluate to identical objects.

Lukas Jezek authored 4 years ago and Tomas Krizek committed 4 years ago

This change allows map() to work with systemd integration.

As a bonus the new client implementation is based on Lua cqueues
allows caller to wrap map() in worker.corroutine() and get
asynchronous execution/avoid blocking main loop.

Currently socket communication does not employ timeouts so a hang
instance will lead to hang map() call. This does not affect query
processing _if_ map() is being run in worker.corroutine.

Fixes: #554
Fixes: #620

daemon: lower EDNS buffer size to 1232

Closes #300 and #538

See merge request knot/knot-resolver!920

Vladimír Čunát authored 4 years ago and Tomas Krizek committed 4 years ago

Note: this commits affects just the small respdiffs, not the big ones.