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# frozen_string_literal: true
module Gitlab
module Ci
class Trace
##
# Trace::Backoff class is responsible for calculating a backoff value
# for when to be able to retry archiving a build's trace
#
# Because we're updating `last_archival_attempt_at` timestamp with every
# failed archival attempt, we need to be sure that sum of the backoff values
# for 1..MAX_ATTEMPTS is under 7 days(CHUNK_REDIS_TTL).
#
class Backoff
include Gitlab::Utils::StrongMemoize
MAX_JITTER_VALUE = 4
attr_reader :archival_attempts
def initialize(archival_attempts)
@archival_attempts = archival_attempts
end
def value
(((chunks_ttl / (3.5 * max_attempts)) * archival_attempts) / 1.hour).hours
end
# This formula generates an increasing delay between executions
# 9.6, 19.2, 28.8, 38.4, 48.0 + a random amount of time to
# change the order of execution for the jobs.
# With maximum value for each call to rand(4), this sums up to 6.8 days
# and with minimum values is 6 days.
#
def value_with_jitter
value + jitter
end
private
def jitter
rand(MAX_JITTER_VALUE).hours
end
def chunks_ttl
::Ci::BuildTraceChunks::RedisBase::CHUNK_REDIS_TTL
end
def max_attempts
::Ci::BuildTraceMetadata::MAX_ATTEMPTS
end
end
end
end
end
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