mirror of
https://github.com/discourse/discourse.git
synced 2024-12-05 10:26:17 +08:00
5302709343
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'
|
|
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)
|
|
|
|
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
|
|
expect(Time.now.to_i).to be <= start + 1
|
|
end
|
|
|
|
it "maintains mutex semantics" do
|
|
m = DistributedMutex.new("test_mutex_key")
|
|
|
|
expect {
|
|
m.synchronize do
|
|
m.synchronize {}
|
|
end
|
|
}.to raise_error(ThreadError)
|
|
end
|
|
|
|
context "readonly redis" do
|
|
before do
|
|
$redis.slaveof "127.0.0.1", "99991"
|
|
end
|
|
|
|
after do
|
|
$redis.slaveof "no", "one"
|
|
end
|
|
|
|
it "works even if redis is in readonly" do
|
|
m = DistributedMutex.new("test_readonly")
|
|
start = Time.now
|
|
done = false
|
|
|
|
expect {
|
|
m.synchronize do
|
|
done = true
|
|
end
|
|
}.to raise_error(Discourse::ReadOnly)
|
|
|
|
expect(done).to eq(false)
|
|
expect(Time.now - start).to be < (1.second)
|
|
end
|
|
end
|
|
|
|
end
|