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[rubygems/rubygems] Fix gem install does-not-exist being super slow

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Every time a gem is not found in the Compact Index API, RubyGems will
fallback to the full index, which is very slow. This is unnecessary
because both indexes should be providing the same gems, so if a gem
can't be found in the Compact Index API, it won't be found in the full
index.

We _do_ want a fallback to the full index, whenever the Compact Index
API is not implemented. To detect that, we check that the API responds
to the "/versions" endpoint, just like Bundler does.

Before:

```
$ time gem install fooasdsfafs
ERROR:  Could not find a valid gem 'fooasdsfafs' (>= 0) in any repository
gem  20,77s user 0,59s system 96% cpu 22,017 total
```

After:

```
$ time gem install fooasdsfafs
ERROR:  Could not find a valid gem 'fooasdsfafs' (>= 0) in any repository
gem  5,02s user 0,09s system 91% cpu 5,568 total
```

c0d6b9eea7
This commit is contained in:
David Rodríguez 2024-09-06 09:34:00 +02:00 • committed by git
parent 2a17b4f022
commit fe1bace43c
5 changed files with 10 additions and 112 deletions
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2
lib/rubygems/source.rb
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@ -79,7 +79,7 @@ class Gem::Source
uri
end
bundler_api_uri = enforce_trailing_slash(fetch_uri)
bundler_api_uri = enforce_trailing_slash(fetch_uri) + "./versions"
begin
fetcher = Gem::RemoteFetcher.fetcher