syncthing/lib
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
..
auto Docs and translation update 2015-09-27 22:31:19 +02:00
beacon Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
config Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
connections Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
db Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
discover Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
events Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
fnmatch Use raw strings to describe regexes, avoids double escaping 2015-09-02 22:19:45 +02:00
ignore Correctly report errors encountered parsing ignores (fixes #2309, fixes #2296) 2015-09-29 18:04:18 +02:00
logger Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
model Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
osutil Revert "Case insensitive renames, part 1" 2015-09-30 21:40:04 +02:00
protocol Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
rc Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
relay Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
scanner Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
signature stsigtool should use the built in key by default 2015-08-24 16:24:00 +02:00
stats Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
symlinks Fix import paths 2015-09-22 19:38:46 +02:00
sync Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
tlsutil Generate certs with SHA256 signature instead of SHA1 2015-09-09 12:55:17 +02:00
upgrade Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
upnp Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00
versioner Implement facility based logger, debugging via REST API 2015-10-03 18:09:53 +02:00