This currently causes 500's errors when loading the MR page
(Discussion) in a few scenarios.
We were not considering detailed diff headers such as
"--- a/doc/update/mysql_to_postgresql.md\n+++ b/doc/update/mysql_to_postgresql.md"
to crop the diff. In order to address it, we're now using
Gitlab::Diff::Parser, clean the diffs and builds Gitlab::Diff::Line objects
we can iterate and filter on.
We request Gitaly in a N+1 manner to build discussion diffs. Once the diffs are from different revisions, it's hard to make a single request to the service in order to build the whole response.
With this change we solve this problem and simplify a lot fetching this piece of info.
Today, when fetching diffs of a note, we always go to Gitaly in order to diff between commits and return the diff of each discussion note. With this change we avoid doing that for notes on the "current version" of the MR.
This adds a method to track errors that can be recovered from in
sentry.
It is useful when debugging performance issues, or exceptions that are
hard to reproduce.
Previously, we kept them all in the cache. We don't need the highlight results
for older diffs - if someone does view that (which is rare), we can do the
highlighting on the fly.
Rugged sometimes chops a context line in between bytes, resulting in the context
line having an invalid encoding: https://github.com/libgit2/rugged/issues/716
When that happens, we will try to detect the encoding for the diff, and
sometimes we'll get it wrong. If that difference in encoding results in a
difference in string lengths between the diff and the underlying blobs, we'd
fail to highlight any inline diffs, and return a 500 status to the user.
As we're using the underlying blobs, the encoding is 'correct' anyway, so if the
string range is invalid, we can just discard the inline diff highlighting. We
still report to Sentry to ensure that we can investigate further in future.
Old merge requests can have diffs without corresponding blobs. (This also may be
possible for commit diffs in corrupt repositories.)
We can't use the `&.` operator on the blobs, because the blob objects are never
nil, but `BatchLoader` instances that delegate to `Blob`. We can't use
`Object#try`, because `Blob` doesn't inherit from `Object`.
`BatchLoader` provides a `__sync` method that returns the delegated object, but
using `itself` also works because it's forwarded, and will work for
non-`BatchLoader` instances too. So the simplest solution is to just use that
with the `&.` operator.
For some old merge requests, we don't have enough information to figure out the
old blob and the new blob for the file. This means that we can't highlight the
diff correctly, but we can still display it without highlighting.
Oswaldo Ferreira
Douwe Maan
Jan Provaznik
Bob Van Landuyt
Sean McGivern
Sean McGivern
🙈 jacopo beschi 🙉
Douwe Maan
Martin Nowak
micael.bergeron
Zeger-Jan van de Weg
Jacopo
AlexWayfer
Valery Sizov
Alejandro Rodríguez
Felipe Artur
Ahmad Sherif
Andrew Newdigate
micael.bergeron
Robert Speicher
Brian Neel
Jacob Vosmaer
Robert Speicher