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https://github.com/hanzoai/tasks.git
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Alex ShtinandGitHub
12fa8cc7bc
## What changed? <!-- Describe what has changed in this PR --> Use code generation for fault injection stores. ## Why? <!-- Tell your future self why have you made these changes --> They all are the same, and code can be generated. Also removed reflection from hot code path. Follow up for #5886. ## How did you test it? <!-- How have you verified this change? Tested locally? Added a unit test? Checked in staging env? --> Compile. ## Potential risks <!-- Assuming the worst case, what can be broken when deploying this change to production? --> No risks. ## Documentation <!-- Have you made sure this change doesn't falsify anything currently stated in `docs/`? If significant new behavior is added, have you described that in `docs/`? --> No. ## Is hotfix candidate? <!-- Is this PR a hotfix candidate or does it require a notification to be sent to the broader community? (Yes/No) --> No.
90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// The MIT License
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//
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// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
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//
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// Copyright (c) 2020 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package faultinjection
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import (
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"math/rand"
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"sync"
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"time"
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)
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type (
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faultMetadata struct {
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fault fault
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threshold float64 // threshold for this fault to be returned
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}
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methodFaultGenerator struct {
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rndMu sync.Mutex
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rnd *rand.Rand // rand is not thread-safe
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rate float64 // chance for one of the errors for this method to be returned
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faultsMetadata []faultMetadata // faults with their thresholds that might be generated for this method
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}
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)
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func newMethodFaultGenerator(faults []fault, seed int64) *methodFaultGenerator {
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if seed == 0 {
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seed = time.Now().UnixNano()
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}
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fm := make([]faultMetadata, 0, len(faults))
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totalRate := 0.0
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for _, f := range faults {
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totalRate += f.rate
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fm = append(fm, faultMetadata{
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fault: f,
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threshold: totalRate,
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})
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}
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return &methodFaultGenerator{
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rate: totalRate,
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faultsMetadata: fm,
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rnd: rand.New(rand.NewSource(seed)),
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}
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}
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func (p *methodFaultGenerator) generate(_ string) *fault {
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if p.rate <= 0 {
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return nil
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}
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p.rndMu.Lock()
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roll := p.rnd.Float64()
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p.rndMu.Unlock()
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if roll < p.rate {
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// Yes, this method call should be failed.
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// Let's find out with what fault.
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for i := range p.faultsMetadata {
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if roll < p.faultsMetadata[i].threshold {
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return &p.faultsMetadata[i].fault
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}
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}
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}
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return nil
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}
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