79 lines
1.9 KiB
Ruby
79 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module QueryLimiting
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class Transaction
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THREAD_KEY = :__gitlab_query_counts_transaction
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attr_accessor :count, :whitelisted
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# The name of the action (e.g. `UsersController#show`) that is being
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# executed.
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attr_accessor :action
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# The maximum number of SQL queries that can be executed in a request. For
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# the sake of keeping things simple we hardcode this value here, it's not
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# supposed to be changed very often anyway.
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THRESHOLD = 100
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# Error that is raised whenever exceeding the maximum number of queries.
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ThresholdExceededError = Class.new(StandardError)
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def self.current
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Thread.current[THREAD_KEY]
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end
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# Starts a new transaction and returns it and the blocks' return value.
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#
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# Example:
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#
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# transaction, retval = Transaction.run do
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# 10
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# end
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#
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# retval # => 10
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def self.run
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transaction = new
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Thread.current[THREAD_KEY] = transaction
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[transaction, yield]
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ensure
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Thread.current[THREAD_KEY] = nil
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end
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def initialize
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@action = nil
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@count = 0
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@whitelisted = false
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end
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# Sends a notification based on the number of executed SQL queries.
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def act_upon_results
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return unless threshold_exceeded?
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error = ThresholdExceededError.new(error_message)
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raise(error) if raise_error?
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end
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def increment
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@count += 1 unless whitelisted
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end
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def raise_error?
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Rails.env.test?
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end
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def threshold_exceeded?
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count > THRESHOLD
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end
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def error_message
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header = 'Too many SQL queries were executed'
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header = "#{header} in #{action}" if action
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"#{header}: a maximum of #{THRESHOLD} is allowed but #{count} SQL queries were executed"
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end
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end
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end
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end
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