Commit Graph

9 Commits

Author SHA1 Message Date
Audrius Butkevicius
caaab462bc lib/sync: Fix broken build 2016-11-05 02:31:52 +00:00
Audrius Butkevicius
da413b823b lib/sync: Add option for sasha-s/go-deadlock 2016-11-05 02:24:53 +00:00
Audrius Butkevicius
3418497f3d lib/sync: Log everything... 2016-11-03 21:33:33 +00:00
Audrius Butkevicius
7fba8cf759 lib/sync: Print all lockers, add holder to RWMutex 2016-10-30 00:17:25 +01:00
Audrius Butkevicius
815588daba lib/sync, lib/model: Capture locker routine ID, print locker details on deadlock 2016-10-18 21:00:01 +01:00
Jakob Borg
d91e6023eb lib/sync: Skip the timing tests if the host timer is flaky 2016-03-27 10:41:38 +00:00
Audrius Butkevicius
5b03c2d949 Remove dead code 2015-10-25 20:46:09 +00:00
Jakob Borg
76af9ba53d Implement facility based logger, debugging via REST API
This implements a new debug/trace infrastructure based on a slightly
hacked up logger. Instead of the traditional "if debug { ... }" I've
rewritten the logger to have no-op Debugln and Debugf, unless debugging
has been enabled for a given "facility". The "facility" is just a
string, typically a package name.

This will be slightly slower than before; but not that much as it's
mostly a function call that returns immediately. For the cases where it
matters (the Debugln takes a hex.Dump() of something for example, and
it's not in a very occasional "if err != nil" branch) there is an
l.ShouldDebug(facility) that is fast enough to be used like the old "if
debug".

The point of all this is that we can now toggle debugging for the
various packages on and off at runtime. There's a new method
/rest/system/debug that can be POSTed a set of facilities to enable and
disable debug for, or GET from to get a list of facilities with
descriptions and their current debug status.

Similarly a /rest/system/log?since=... can grab the latest log entries,
up to 250 of them (hardcoded constant in main.go) plus the initial few.

Not implemented in this commit (but planned) is a simple debug GUI
available on /debug that shows the current log in an easily pasteable
format and has checkboxes to enable the various debug facilities.

The debug instructions to a user then becomes "visit this URL, check
these boxes, reproduce your problem, copy and paste the log". The actual
log viewer on the hypothetical /debug URL can poll regularly for new log
entries and this bypass the 250 line limit.

The existing STTRACE=foo variable is still obeyed and just sets the
start state of the system.
2015-10-03 18:09:53 +02:00
Jakob Borg
7705a6c1f1 mv internal lib 2015-08-09 09:35:26 +02:00