Class: Gitlab::DiscussionsDiff::HighlightCache

Inherits:
Object
  • Object
show all
Extended by:
Utils::Gzip
Defined in:
lib/gitlab/discussions_diff/highlight_cache.rb

Constant Summary collapse

VERSION =
1
EXPIRATION =
1.week

Class Method Summary collapse

Methods included from Utils::Gzip

gzip_compress, gzip_decompress

Class Method Details

.cache_key_for(raw_key) ⇒ Object


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# File 'lib/gitlab/discussions_diff/highlight_cache.rb', line 72

def cache_key_for(raw_key)
  "#{cache_key_prefix}:#{raw_key}"
end

.clear_multiple(raw_keys) ⇒ Object

Clears multiple cache keys at once.

raw_keys - An Array of unique cache keys, without namespaces.

It returns the number of cache keys cleared. Ex.: 42


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# File 'lib/gitlab/discussions_diff/highlight_cache.rb', line 60

def clear_multiple(raw_keys)
  return [] if raw_keys.empty?

  keys = raw_keys.map { |id| cache_key_for(id) }

  Redis::Cache.with do |redis|
    Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
      redis.del(keys)
    end
  end
end

.read_multiple(raw_keys) ⇒ Object

Reads multiple cache keys at once.

raw_keys - An Array of unique cache keys, without namespaces.

It returns a list of deserialized diff lines. Ex.:

[Gitlab::Diff::Line, …], [Gitlab::Diff::Line]

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# File 'lib/gitlab/discussions_diff/highlight_cache.rb', line 34

def read_multiple(raw_keys)
  return [] if raw_keys.empty?

  keys = raw_keys.map { |id| cache_key_for(id) }

  content =
    Redis::Cache.with do |redis|
      Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
        redis.mget(keys)
      end
    end

  content.map! do |lines|
    next unless lines

    Gitlab::Json.parse(gzip_decompress(lines)).map! do |line|
      Gitlab::Diff::Line.safe_init_from_hash(line)
    end
  end
end

.write_multiple(mapping) ⇒ Object

Sets multiple keys to a given value. The value is serialized as JSON.

mapping - Write multiple cache values at once


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# File 'lib/gitlab/discussions_diff/highlight_cache.rb', line 16

def write_multiple(mapping)
  Redis::Cache.with do |redis|
    redis.multi do |multi|
      mapping.each do |raw_key, value|
        key = cache_key_for(raw_key)

        multi.set(key, gzip_compress(value.to_json), ex: EXPIRATION)
      end
    end
  end
end