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Merge pull request #27 from caesarxuchao/chao-testing
Chaos testing
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/* | ||
Copyright 2016 The Kubernetes Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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// Copied from k8s.io/kubernetes/test/e2e/chaosmonkey/chaosmonkey.go | ||
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package chaosmonkey | ||
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import . "github.com/onsi/ginkgo" | ||
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// Disruption is the type to construct a chaosmonkey with; see Do for more information. | ||
type Disruption func() | ||
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// Test is the type to register with a chaosmonkey. A test will run asynchronously across the | ||
// chaosmonkey's Disruption. A Test takes a Semaphore as an argument. It should call sem.Ready() | ||
// once it's ready for the disruption to start and should then wait until sem.StopCh (which is a | ||
// <-chan struct{}) is closed, which signals that the disruption is over. It should then clean up | ||
// and return. See Do and Semaphore for more information. | ||
type Test func(sem *Semaphore) | ||
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// Interface can be implemented if you prefer to define tests without dealing with a Semaphore. You | ||
// may define a struct that implements Interface's three methods (Setup, Test, and Teardown) and | ||
// RegisterInterface. See RegisterInterface for more information. | ||
type Interface interface { | ||
Setup() | ||
Test(stopCh <-chan struct{}) | ||
Teardown() | ||
} | ||
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type chaosmonkey struct { | ||
disruption Disruption | ||
tests []Test | ||
} | ||
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// New creates and returns a chaosmonkey, with which the caller should register Tests and call Do. | ||
// See Do for more information. | ||
func New(disruption Disruption) *chaosmonkey { | ||
return &chaosmonkey{ | ||
disruption, | ||
[]Test{}, | ||
} | ||
} | ||
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// Register registers the given Test with the chaosmonkey, so that the test will run over the | ||
// Disruption. | ||
func (cm *chaosmonkey) Register(test Test) { | ||
cm.tests = append(cm.tests, test) | ||
} | ||
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// RegisterInterface registers the given Interface with the chaosmonkey, so the chaosmonkey will | ||
// call Setup, Test, and Teardown properly. Test can tell that the Disruption is finished when | ||
// stopCh is closed. | ||
func (cm *chaosmonkey) RegisterInterface(in Interface) { | ||
cm.Register(func(sem *Semaphore) { | ||
in.Setup() | ||
sem.Ready() | ||
in.Test(sem.StopCh) | ||
in.Teardown() | ||
}) | ||
} | ||
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// Do performs the Disruption while testing the registered Tests. Once the caller has registered | ||
// all Tests with the chaosmonkey, they call Do. Do starts each registered test asynchronously and | ||
// waits for each test to signal that it is ready by calling sem.Ready(). Do will then do the | ||
// Disruption, and when it's complete, close sem.StopCh to signal to the registered Tests that the | ||
// Disruption is over, and wait for all Tests to return. | ||
func (cm *chaosmonkey) Do() { | ||
sems := []*Semaphore{} | ||
// All semaphores have the same StopCh. | ||
stopCh := make(chan struct{}) | ||
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for _, test := range cm.tests { | ||
test := test | ||
sem := newSemaphore(stopCh) | ||
sems = append(sems, sem) | ||
go func() { | ||
defer GinkgoRecover() | ||
defer sem.done() | ||
test(sem) | ||
}() | ||
} | ||
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By("Waiting for all async tests to be ready") | ||
for _, sem := range sems { | ||
// Wait for test to be ready. We have to wait for ready *or done* because a test | ||
// may panic before signaling that its ready, and we shouldn't block. Since we | ||
// defered sem.done() above, if a test panics, it's marked as done. | ||
sem.waitForReadyOrDone() | ||
} | ||
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defer func() { | ||
close(stopCh) | ||
By("Waiting for async validations to complete") | ||
for _, sem := range sems { | ||
sem.waitForDone() | ||
} | ||
}() | ||
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By("Starting disruption") | ||
cm.disruption() | ||
By("Disruption complete; stopping async validations") | ||
} | ||
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// Semaphore is taken by a Test and provides: Ready(), for the Test to call when it's ready for the | ||
// disruption to start; and StopCh, the closure of which signals to the Test that the disruption is | ||
// finished. | ||
type Semaphore struct { | ||
readyCh chan struct{} | ||
StopCh <-chan struct{} | ||
doneCh chan struct{} | ||
} | ||
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func newSemaphore(stopCh <-chan struct{}) *Semaphore { | ||
// We don't want to block on Ready() or done() | ||
return &Semaphore{ | ||
make(chan struct{}, 1), | ||
stopCh, | ||
make(chan struct{}, 1), | ||
} | ||
} | ||
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// Ready is called by the Test to signal that the Test is ready for the disruption to start. | ||
func (sem *Semaphore) Ready() { | ||
close(sem.readyCh) | ||
} | ||
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// done is an internal method for Go to defer, both to wait for all tests to return, but also to | ||
// sense if a test panicked before calling Ready. See waitForReadyOrDone. | ||
func (sem *Semaphore) done() { | ||
close(sem.doneCh) | ||
} | ||
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// We would like to just check if all tests are ready, but if they fail (which Ginkgo implements as | ||
// a panic), they may not have called Ready(). We check done as well to see if the function has | ||
// already returned; if it has, we don't care if it's ready, and just continue. | ||
func (sem *Semaphore) waitForReadyOrDone() { | ||
select { | ||
case <-sem.readyCh: | ||
case <-sem.doneCh: | ||
} | ||
} | ||
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// waitForDone is an internal method for Go to wait on all Tests returning. | ||
func (sem *Semaphore) waitForDone() { | ||
<-sem.doneCh | ||
} |
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