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# frozen_string_literal: true
#
module Gitlab
module DiscussionsDiff
class HighlightCache
extend Gitlab::Utils::Gzip
class << self
VERSION = 1
EXPIRATION = 1.week
# Sets multiple keys to a given value. The value
# is serialized as JSON.
#
# mapping - Write multiple cache values at once
def write_multiple(mapping)
with_redis do |redis|
Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
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
end
# 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]]
def read_multiple(raw_keys)
return [] if raw_keys.empty?
keys = raw_keys.map { |id| cache_key_for(id) }
content =
with_redis 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
# 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
def clear_multiple(raw_keys)
return [] if raw_keys.empty?
keys = raw_keys.map { |id| cache_key_for(id) }
with_redis do |redis|
Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
redis.del(keys)
end
end
end
def cache_key_for(raw_key)
"#{cache_key_prefix}:#{raw_key}"
end
private
def cache_key_prefix
"#{Redis::Cache::CACHE_NAMESPACE}:#{VERSION}:discussion-highlight"
end
def with_redis(&block)
Redis::Cache.with(&block) # rubocop:disable CodeReuse/ActiveRecord
end
end
end
end
end
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