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114 lines
2.7 KiB
Go
114 lines
2.7 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package physical
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import (
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"context"
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"errors"
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"math/rand"
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"sync"
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"time"
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log "github.com/hashicorp/go-hclog"
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)
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const (
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// DefaultErrorPercent is used to determin how often we error
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DefaultErrorPercent = 20
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)
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// ErrorInjector is used to add errors into underlying physical requests
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type ErrorInjector struct {
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backend Backend
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errorPercent int
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randomLock *sync.Mutex
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random *rand.Rand
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}
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// TransactionalErrorInjector is the transactional version of the error
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// injector
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type TransactionalErrorInjector struct {
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*ErrorInjector
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Transactional
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}
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// Verify ErrorInjector satisfies the correct interfaces
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var (
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_ Backend = (*ErrorInjector)(nil)
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_ Transactional = (*TransactionalErrorInjector)(nil)
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)
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// NewErrorInjector returns a wrapped physical backend to inject error
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func NewErrorInjector(b Backend, errorPercent int, logger log.Logger) *ErrorInjector {
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if errorPercent < 0 || errorPercent > 100 {
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errorPercent = DefaultErrorPercent
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}
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logger.Info("creating error injector")
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return &ErrorInjector{
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backend: b,
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errorPercent: errorPercent,
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randomLock: new(sync.Mutex),
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random: rand.New(rand.NewSource(int64(time.Now().Nanosecond()))),
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}
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}
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// NewTransactionalErrorInjector creates a new transactional ErrorInjector
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func NewTransactionalErrorInjector(b Backend, errorPercent int, logger log.Logger) *TransactionalErrorInjector {
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return &TransactionalErrorInjector{
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ErrorInjector: NewErrorInjector(b, errorPercent, logger),
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Transactional: b.(Transactional),
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}
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}
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func (e *ErrorInjector) SetErrorPercentage(p int) {
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e.errorPercent = p
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}
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func (e *ErrorInjector) addError() error {
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e.randomLock.Lock()
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roll := e.random.Intn(100)
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e.randomLock.Unlock()
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if roll < e.errorPercent {
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return errors.New("random error")
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}
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return nil
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}
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func (e *ErrorInjector) Put(ctx context.Context, entry *Entry) error {
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if err := e.addError(); err != nil {
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return err
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}
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return e.backend.Put(ctx, entry)
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}
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func (e *ErrorInjector) Get(ctx context.Context, key string) (*Entry, error) {
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if err := e.addError(); err != nil {
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return nil, err
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}
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return e.backend.Get(ctx, key)
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}
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func (e *ErrorInjector) Delete(ctx context.Context, key string) error {
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if err := e.addError(); err != nil {
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return err
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}
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return e.backend.Delete(ctx, key)
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}
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func (e *ErrorInjector) List(ctx context.Context, prefix string) ([]string, error) {
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if err := e.addError(); err != nil {
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return nil, err
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}
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return e.backend.List(ctx, prefix)
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}
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func (e *TransactionalErrorInjector) Transaction(ctx context.Context, txns []*TxnEntry) error {
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if err := e.addError(); err != nil {
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return err
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}
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return e.Transactional.Transaction(ctx, txns)
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}
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