113 lines
2.9 KiB
Ruby
113 lines
2.9 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
module Counters
|
|
class BufferedCounter
|
|
include Gitlab::ExclusiveLeaseHelpers
|
|
|
|
WORKER_DELAY = 10.minutes
|
|
WORKER_LOCK_TTL = 10.minutes
|
|
|
|
LUA_FLUSH_INCREMENT_SCRIPT = <<~LUA
|
|
local increment_key, flushed_key = KEYS[1], KEYS[2]
|
|
local increment_value = redis.call("get", increment_key) or 0
|
|
local flushed_value = redis.call("incrby", flushed_key, increment_value)
|
|
if flushed_value == 0 then
|
|
redis.call("del", increment_key, flushed_key)
|
|
else
|
|
redis.call("del", increment_key)
|
|
end
|
|
return flushed_value
|
|
LUA
|
|
|
|
def initialize(counter_record, attribute)
|
|
@counter_record = counter_record
|
|
@attribute = attribute
|
|
end
|
|
|
|
def get
|
|
redis_state do |redis|
|
|
redis.get(key).to_i
|
|
end
|
|
end
|
|
|
|
def increment(amount)
|
|
result = redis_state do |redis|
|
|
redis.incrby(key, amount)
|
|
end
|
|
|
|
FlushCounterIncrementsWorker.perform_in(WORKER_DELAY, counter_record.class.name, counter_record.id, attribute)
|
|
|
|
result
|
|
end
|
|
|
|
def reset!
|
|
counter_record.update!(attribute => 0)
|
|
|
|
redis_state do |redis|
|
|
redis.del(key)
|
|
end
|
|
end
|
|
|
|
def commit_increment!
|
|
with_exclusive_lease do
|
|
flush_amount = amount_to_be_flushed
|
|
next if flush_amount == 0
|
|
|
|
counter_record.transaction do
|
|
counter_record.update_counters_with_lease({ attribute => flush_amount })
|
|
remove_flushed_key
|
|
end
|
|
|
|
counter_record.execute_after_commit_callbacks
|
|
end
|
|
|
|
counter_record.reset.read_attribute(attribute)
|
|
end
|
|
|
|
# amount_to_be_flushed returns the total value to be flushed.
|
|
# The total value is the sum of the following:
|
|
# - current value in the increment_key
|
|
# - any existing value in the flushed_key that has not been flushed
|
|
def amount_to_be_flushed
|
|
redis_state do |redis|
|
|
redis.eval(LUA_FLUSH_INCREMENT_SCRIPT, keys: [key, flushed_key])
|
|
end
|
|
end
|
|
|
|
def key
|
|
project_id = counter_record.project.id
|
|
record_name = counter_record.class
|
|
record_id = counter_record.id
|
|
|
|
"project:{#{project_id}}:counters:#{record_name}:#{record_id}:#{attribute}"
|
|
end
|
|
|
|
def flushed_key
|
|
"#{key}:flushed"
|
|
end
|
|
|
|
private
|
|
|
|
attr_reader :counter_record, :attribute
|
|
|
|
def remove_flushed_key
|
|
redis_state do |redis|
|
|
redis.del(flushed_key)
|
|
end
|
|
end
|
|
|
|
def redis_state(&block)
|
|
Gitlab::Redis::SharedState.with(&block)
|
|
end
|
|
|
|
def with_exclusive_lease(&block)
|
|
lock_key = "#{key}:locked"
|
|
|
|
in_lock(lock_key, ttl: WORKER_LOCK_TTL, &block)
|
|
rescue Gitlab::ExclusiveLeaseHelpers::FailedToObtainLockError
|
|
# a worker is already updating the counters
|
|
end
|
|
end
|
|
end
|
|
end
|