Previously the following configuration didn't work properly:
{log_root, "logs"},
{handlers, [{lager_file_backend, [{file, "access.log"}, {level, none}, ...]}]},
{traces, [{{lager_file_backend, "access.log"}, [{tag, access}], info}]}
When lager:trace_file was trying to find a file among the existing
handlers, it was searching for the expanded file name
("logs/access.log"), but the handlers store the file names without
expansion ("access.log"), so it didn't find it.
The result was that lager:trace_file started another "access.log"
backend, which of course didn't use e.g. the log rotation settings of
the first handler. When the log_root was relative, then each log
message appeared twice in the log file (both backends thought that they
should log it, because when calculating the Destination,
"logs/access.log" was used in both cases).
Now the code performs path expansion on the file name inside the handler
too. Also, now it calculates the absolute paths of both files, so that
if one file is specified with an absolute path and the other with a
relative path, lager will still know that they are the same.
Test
----
Using the old code (tag 3.2.4 was tested) the new test usually fails the
following way:
module 'lager_trace_test'
lager_trace_test: trace_test_ (Trace combined with log_root)...*failed*
in function lager_trace_test:'-trace_test_/0-fun-6-'/0 (test/lager_trace_test.erl, line 71)
**throw:{too_many_entries,{ok,<<"Test message\n2017-03-26 23:04:23.935 [info] <0.5898.0>@lager"...>>}}
output:<<"">>
The reason for failing only usually is that it might happen that the
duplicate log entry is added to file only after we called
time:sleep(1000) and checked that the log entry is not there.
Don't use dirty timeout for gen_statem
That was introduced in OTP 19.2, and causes
failures in tests on OTP 19 and 19.1
Fix statem for all 19.x releases
Previously, error_logger messages only had the pid of the crashed
process, not any of the traditional lager metadata like
module, function, line, etc.
It turns out, however, that we already have most if not all of that
information as metadata already in the stack trace. Thus, we can capture
it and re-inject the error logger log message as a lager message with
metadata.
Additionally, when a process crashes, we get the process dictionary
passed to us, which we can scan for the '_lager_metadata' entry, and
attach the dead process' metadata to the log message as well.
On final analysis, it appears the effective fix is clearing out leftover lager state in the application controller.
Along the way, the test body was modified to account for the runtime system, and as this doesn't seem like a bad thing it's left in place.
This commit also moves `otp_version/0` to `lager_util`'s public API, as it may be helpful in future tests that check for version-specific messages (see issue #383).
Uses lager_util:create_test_dir/0 and lager_util:delete_test_dir/1 to give tests, or groups thereof, their own clean directory to work in.
Turn off whitespace diffs to review, as much code is shifted left to allow sane wrapping within around 100 columns.
Change rotate_file_test/0 and rotate_file_fail_test/0 to use temporary test directories.
Refactor rotate_file_test/0 to be marginally understandable.
Fix rotate_file_fail_test/0 to use 'chmod', as intended, instead of 'chown'.
This allows users to log metadata (tuple list) without a format string in lager. For
example `lager:info([{foo, bar}])` instead of `lager:info([{foo,bar}], "")`.
Add `| undefined` to records that get initialized with not all their
fields set to the proper type (hence get the value undefined). These
fixes allow lager to exist as a dependency in a project and be filtered
through that project's dialyzer run without warnings.
Mark Allen
Csaba Hoch
holsee
Panagiotis Papadomitsos
Andrew Thompson
walrusVision
Mark Allen
Michał Piotrowski
Ted Burghart
Drew Varner
Nick Marino
Brett Hazen
Doug Rohrer
Doug Rohrer
Bishop Bors