66 lines
1.4 KiB
Ruby
66 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module HealthChecks
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# This check is registered on master,
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# and validated by worker
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class MasterCheck
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extend SimpleAbstractCheck
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class << self
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def register_master
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# when we fork, we pass the read pipe to child
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# child can then react on whether the other end
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# of pipe is still available
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@pipe_read, @pipe_write = IO.pipe
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end
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def finish_master
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close_read
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close_write
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end
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def register_worker
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# fork needs to close the pipe
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close_write
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end
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private
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def close_read
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@pipe_read&.close
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@pipe_read = nil
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end
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def close_write
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@pipe_write&.close
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@pipe_write = nil
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end
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def metric_prefix
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'master_check'
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end
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def successful?(result)
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result
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end
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def check
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# the lack of pipe is a legitimate failure of check
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return false unless @pipe_read
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@pipe_read.read_nonblock(1)
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true
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rescue IO::EAGAINWaitReadable
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# if it is blocked, it means that the pipe is still open
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# and there's no data waiting on it
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true
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rescue EOFError
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# the pipe is closed
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false
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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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