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# frozen_string_literal: true
module Gitlab
module OptimisticLocking
MAX_RETRIES = 100
module_function
def retry_lock(subject, max_retries = MAX_RETRIES, name:, &block)
start_time = Gitlab::Metrics::System.monotonic_time
retry_attempts = 0
begin
subject.transaction do
yield(subject)
end
rescue ActiveRecord::StaleObjectError
raise unless retry_attempts < max_retries
subject.reset
retry_attempts += 1
retry
ensure
retry_lock_histogram.observe({}, retry_attempts)
log_optimistic_lock_retries(
name: name,
retry_attempts: retry_attempts,
start_time: start_time)
end
end
alias_method :retry_optimistic_lock, :retry_lock
def log_optimistic_lock_retries(name:, retry_attempts:, start_time:)
return unless retry_attempts > 0
elapsed_time = Gitlab::Metrics::System.monotonic_time - start_time
retry_lock_logger.info(
message: "Optimistic Lock released with retries",
name: name,
retries: retry_attempts,
time_s: elapsed_time)
end
def retry_lock_logger
@retry_lock_logger ||= Gitlab::Services::Logger.build
end
def retry_lock_histogram
@retry_lock_histogram ||=
Gitlab::Metrics.histogram(
:gitlab_optimistic_locking_retries,
'Number of retry attempts to execute optimistic retry lock',
{},
[0, 1, 2, 3, 5, 10, 50]
)
end
end
end
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