58 lines
2.2 KiB
Ruby
58 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Migrations
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module LockRetriesHelpers
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# Executes the block with a retry mechanism that alters the +lock_timeout+ and +sleep_time+ between attempts.
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# The timings can be controlled via the +timing_configuration+ parameter.
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# If the lock was not acquired within the retry period, a last attempt is made without using +lock_timeout+.
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#
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# Note this helper uses subtransactions when run inside an already open transaction.
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#
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# ==== Examples
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# # Invoking without parameters
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# with_lock_retries do
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# drop_table :my_table
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# end
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#
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# # Invoking with custom +timing_configuration+
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# t = [
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# [1.second, 1.second],
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# [2.seconds, 2.seconds]
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# ]
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#
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# with_lock_retries(timing_configuration: t) do
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# drop_table :my_table # this will be retried twice
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# end
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#
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# # Disabling the retries using an environment variable
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# > export DISABLE_LOCK_RETRIES=true
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#
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# with_lock_retries do
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# drop_table :my_table # one invocation, it will not retry at all
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# end
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#
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# ==== Parameters
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# * +timing_configuration+ - [[ActiveSupport::Duration, ActiveSupport::Duration], ...] lock timeout for the
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# block, sleep time before the next iteration, defaults to
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# `Gitlab::Database::WithLockRetries::DEFAULT_TIMING_CONFIGURATION`
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# * +logger+ - [Gitlab::JsonLogger]
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# * +env+ - [Hash] custom environment hash, see the example with `DISABLE_LOCK_RETRIES`
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def with_lock_retries(*args, **kwargs, &block)
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raise_on_exhaustion = !!kwargs.fetch(:raise_on_exhaustion, true)
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merged_args = {
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connection: connection,
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klass: self.class,
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logger: Gitlab::BackgroundMigration::Logger,
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allow_savepoints: true
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}.merge(kwargs.except(:raise_on_exhaustion))
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Gitlab::Database::WithLockRetries.new(**merged_args)
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.run(raise_on_exhaustion: raise_on_exhaustion, &block)
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end
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end
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end
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end
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end
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