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If we detect redis is in readonly we can not correctly get a mutex raise an exception to notify caller When getting optimized images avoid the distributed mutex unless for some reason it is the first call and we need to generate a thumb In redis readonly no thumbnails will be generated
74 lines
1.4 KiB
Ruby
74 lines
1.4 KiB
Ruby
require 'rails_helper'
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require_dependency 'distributed_mutex'
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describe DistributedMutex do
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it "allows only one mutex object to have the lock at a time" do
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mutexes = (1..10).map do
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DistributedMutex.new("test_mutex_key")
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end
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x = 0
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mutexes.map do |m|
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Thread.new do
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m.synchronize do
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y = x
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sleep 0.001
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x = y + 1
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end
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end
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end.map(&:join)
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expect(x).to eq(10)
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end
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it "handles auto cleanup correctly" do
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m = DistributedMutex.new("test_mutex_key")
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$redis.setnx "test_mutex_key", Time.now.to_i - 1
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start = Time.now.to_i
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m.synchronize do
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"nop"
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end
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# no longer than a second
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expect(Time.now.to_i).to be <= start + 1
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end
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it "maintains mutex semantics" do
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m = DistributedMutex.new("test_mutex_key")
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expect {
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m.synchronize do
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m.synchronize {}
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end
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}.to raise_error(ThreadError)
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end
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context "readonly redis" do
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before do
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$redis.slaveof "127.0.0.1", "99991"
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end
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after do
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$redis.slaveof "no", "one"
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end
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it "works even if redis is in readonly" do
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m = DistributedMutex.new("test_readonly")
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start = Time.now
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done = false
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expect {
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m.synchronize do
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done = true
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end
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}.to raise_error(Discourse::ReadOnly)
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expect(done).to eq(false)
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expect(Time.now - start).to be < (1.second)
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end
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end
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end
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