diff options
Diffstat (limited to 'lib/gitlab/shard_health_cache.rb')
-rw-r--r-- | lib/gitlab/shard_health_cache.rb | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/gitlab/shard_health_cache.rb b/lib/gitlab/shard_health_cache.rb new file mode 100644 index 00000000000..3f03f46d4b1 --- /dev/null +++ b/lib/gitlab/shard_health_cache.rb @@ -0,0 +1,41 @@ +module Gitlab + class ShardHealthCache + HEALTHY_SHARDS_KEY = 'gitlab-healthy-shards'.freeze + HEALTHY_SHARDS_TIMEOUT = 300 + + # Clears the Redis set storing the list of healthy shards + def self.clear + Gitlab::Redis::Cache.with { |redis| redis.del(HEALTHY_SHARDS_KEY) } + end + + # Updates the list of healthy shards using a Redis set + # + # shards - An array of shard names to store + def self.update(shards) + Gitlab::Redis::Cache.with do |redis| + redis.multi do |m| + m.del(HEALTHY_SHARDS_KEY) + shards.each { |shard_name| m.sadd(HEALTHY_SHARDS_KEY, shard_name) } + m.expire(HEALTHY_SHARDS_KEY, HEALTHY_SHARDS_TIMEOUT) + end + end + end + + # Returns an array of strings of healthy shards + def self.cached_healthy_shards + Gitlab::Redis::Cache.with { |redis| redis.smembers(HEALTHY_SHARDS_KEY) } + end + + # Checks whether the given shard name is in the list of healthy shards. + # + # shard_name - The string to check + def self.healthy_shard?(shard_name) + Gitlab::Redis::Cache.with { |redis| redis.sismember(HEALTHY_SHARDS_KEY, shard_name) } + end + + # Returns the number of healthy shards in the Redis set + def self.healthy_shard_count + Gitlab::Redis::Cache.with { |redis| redis.scard(HEALTHY_SHARDS_KEY) } + end + end +end |