* Replace error assertions with Go 1.13 style
Use `errors.As(..)` over type assertions. This enables better use of
wrapped errors in the future, and lets us pass some errorlint checks
in the process.
The rewrite is entirely mechanical, and uses a standard idiom for
doing so.
* Use Go 1.13's errors.Is(..)
Rather than directly checking for error equality, use errors.Is(..).
This protects against error wrapping issues in the future.
Even though something like sql.ErrNoRows doesn't need the wrapping, do
so anyway, for the sake of consistency throughout the code base.
The change almost lets us pass the `errorlint` Go checker except for
a missing case in `js.go` which is to be handled separately; it isn't
mechanical, like these changes are.
* Remove goconst
goconst isn't a useful linter in many cases, because it's false positive
rate is high. It's 100% for the current code base.
* Avoid direct comparison of errors in recover()
Assert that we are catching an error from recover(). If we are,
check that the error caught matches errStop.
* Enable the "errorlint" checker
Configure the checker to avoid checking for errorf wraps. These are
often false positives since the suggestion is to blanket wrap errors
with %w, and that exposes the underlying API which you might not want
to do.
The other warnings are good however, and with the current patch stack,
the code base passes all these checks as well.
* Configure rowserrcheck
The project uses sqlx. Configure rowserrcheck to include said package.
* Mechanically rewrite a large set of errors
Mechanically search for errors that look like
fmt.Errorf("...%s", err.Error())
and rewrite those into
fmt.Errorf("...%v", err)
The `fmt` package is error-aware and knows how to call err.Error()
itself.
The rationale is that this is more idiomatic Go; it paves the
way for using error wrapping later with %w in some sites.
This patch only addresses the entirely mechanical rewriting caught by
a project-side search/replace. There are more individual sites not
addressed by this patch.
* Log 3 unchecked errors
Rather than ignore errors, log them at
the WARNING log level.
The server has been functioning without these, so assume they are not at
the ERROR level.
* Log errors in concurrency test
If we can't initialize the configuration, treat the test as a failure.
* Undo the errcheck on configurations for now.
* Handle unchecked errors in pkg/manager
* Resolve unchecked errors
* Handle DLNA/DMS unchecked errors
* Handle error checking in concurrency test
Generalize config initialization, so we can initialize a configuration
without writing it to disk.
Use this in the test case, since otherwise the test fails to write.
* Handle the remaining unchecked errors
* Heed gosimple in update test
* Use one-line if-initializer statements
While here, fix a wrong variable capture error.
* testing.T doesn't support %w
use %v instead which is supported.
* Remove unused query builder functions
The Int/String criterion handler functions are now generalized.
Thus, there's no need to keep these functions around anymore.
* Mark filterBuilder.addRecursiveWith nolint
The function is useful in the future and no other refactors are looking
nice.
Keep the function around, but tell the linter to ignore it.
* Remove utils.Btoi
There are no users of this utility function
* Return error on scan failure
If we fail to scan the row when looking for the
unique checksum index, then report the error upwards.
* Fix comments on exported functions
* Fix typos
* Fix startup error
* Add indexes for path and checksum to images
The scenes table has unique indexes/constraints on path and checksum
colums. The images table doesn't, which doesn't really make sense, as
scanning uses these colums extensively which warrents an index, and both
should be unique as well.
Adding these indexes thus heavily improves the scanning tasks
performance. On a database containing 4700 images a (re)scan of those
4700 files, which thus shouldn't do anything, took 1.2 seconds, with the
indexes added this only takes 0.4 seconds. Taking the same test on a
generated database containing 4M images + the actual 4700 images took 26
minutes for a rescan, and with the index existing also only takes 0.4
seconds.
* Add images.checksum unique constraint in code with fallback
Work around the issue where in some cases duplicate images (/checksums
on images) might exist. This as discussed in #1740 by creating the index
on startup and in case of an error logging the duplicates. This so the
users where this scenario exists can correct the database (by searching
on the logged checksum(s) and removing the duplicates) and after a
restart the unique index / constraint will still be created. In case
when creating the unique index fails a "normal" / non-unique index is
created as surrogate so the user will still get the performance benefit
(for example during scanning) without being forced to remove the
duplicates and restart beforehand. This surrogate is also automatically
cleaned up after the unique index is succesfully created.
SmallCoccinelle