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# frozen_string_literal: true
require_relative '../../../lib/gitlab/process_management'
RSpec.describe Gitlab::ProcessManagement do
describe '.trap_signals' do
it 'traps the given signals' do
expect(described_class).to receive(:trap).ordered.with(:INT)
expect(described_class).to receive(:trap).ordered.with(:HUP)
described_class.trap_signals(%i(INT HUP))
end
end
describe '.trap_terminate' do
it 'traps the termination signals' do
expect(described_class).to receive(:trap_signals)
.with(described_class::TERMINATE_SIGNALS)
described_class.trap_terminate { }
end
end
describe '.trap_forward' do
it 'traps the signals to forward' do
expect(described_class).to receive(:trap_signals)
.with(described_class::FORWARD_SIGNALS)
described_class.trap_forward { }
end
end
describe '.signal_processes' do
it 'sends a signal to every given process' do
expect(described_class).to receive(:signal).with(1, :INT)
described_class.signal_processes([1], :INT)
end
end
describe '.signal' do
it 'sends a signal to the given process' do
allow(Process).to receive(:kill).with(:INT, 4)
expect(described_class.signal(4, :INT)).to eq(true)
end
it 'returns false when the process does not exist' do
allow(Process).to receive(:kill).with(:INT, 4).and_raise(Errno::ESRCH)
expect(described_class.signal(4, :INT)).to eq(false)
end
end
describe '.wait_async' do
it 'waits for a process in a separate thread' do
thread = described_class.wait_async(Process.spawn('true'))
# Upon success Process.wait just returns the PID.
expect(thread.value).to be_a_kind_of(Numeric)
end
end
# In the X_alive? checks, we check negative PIDs sometimes as a simple way
# to be sure the pids are definitely for non-existent processes.
# Note that -1 is special, and sends the signal to every process we have permission
# for, so we use -2, -3 etc
describe '.all_alive?' do
it 'returns true if all processes are alive' do
processes = [Process.pid]
expect(described_class.all_alive?(processes)).to eq(true)
end
it 'returns false when a thread was not alive' do
processes = [-2]
expect(described_class.all_alive?(processes)).to eq(false)
end
end
describe '.process_alive?' do
it 'returns true if the proces is alive' do
process = Process.pid
expect(described_class.process_alive?(process)).to eq(true)
end
it 'returns false when a thread was not alive' do
process = -2
expect(described_class.process_alive?(process)).to eq(false)
end
end
describe '.pids_alive' do
it 'returns the pids that are alive, from a given array' do
pids = [Process.pid, -2]
expect(described_class.pids_alive(pids)).to match_array([Process.pid])
end
end
describe '.any_alive?' do
it 'returns true if at least one process is alive' do
processes = [Process.pid, -2]
expect(described_class.any_alive?(processes)).to eq(true)
end
it 'returns false when all threads are dead' do
processes = [-2, -3]
expect(described_class.any_alive?(processes)).to eq(false)
end
end
describe '.write_pid' do
it 'writes the PID of the current process to the given file' do
handle = double(:handle)
allow(File).to receive(:open).with('/dev/null', 'w').and_yield(handle)
expect(handle).to receive(:write).with(Process.pid.to_s)
described_class.write_pid('/dev/null')
end
end
end
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