discourse/spec/components/distributed_mutex_spec.rb

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require 'rails_helper'
require_dependency 'distributed_mutex'
describe DistributedMutex do
it "allows only one mutex object to have the lock at a time" do
mutexes = (1..10).map do
DistributedMutex.new("test_mutex_key")
end
x = 0
mutexes.map do |m|
Thread.new do
m.synchronize do
y = x
sleep 0.001
x = y + 1
end
end
end.map(&:join)
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expect(x).to eq(10)
end
it "handles auto cleanup correctly" do
m = DistributedMutex.new("test_mutex_key")
$redis.setnx "test_mutex_key", Time.now.to_i - 1
start = Time.now.to_i
m.synchronize do
"nop"
end
# no longer than a second
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expect(Time.now.to_i).to be <= start + 1
end
it "maintains mutex semantics" do
m = DistributedMutex.new("test_mutex_key")
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expect {
m.synchronize do
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m.synchronize {}
end
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}.to raise_error(ThreadError)
end
end