/
unreliablebus.go
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/
unreliablebus.go
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// Copyright 2023 LiveKit, Inc.
//
// 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.
package testutils
import (
"context"
"math/rand"
"go.uber.org/atomic"
)
type AtomicFailureRate struct {
v *atomic.Float64
}
func NewAtomicFailureRate(v float64) AtomicFailureRate {
return AtomicFailureRate{v: atomic.NewFloat64(v)}
}
func (g *AtomicFailureRate) Rate() float64 {
return g.v.Load()
}
func (g *AtomicFailureRate) SetRate(v float64) {
g.v.Store(v)
}
func WithUnreliableBus(rate AtomicFailureRate) TestBusOption {
return WithUnreliableBusChannel(rate, "")
}
func WithUnreliableBusChannel(rate AtomicFailureRate, channelFilter string) TestBusOption {
return WithSubscribeInterceptor(func(_ context.Context, channel string, next ReadHandler) ReadHandler {
if channelFilter != "" && channelFilter != channel {
return next
}
rng := rand.New(rand.NewSource(0))
return func() ([]byte, bool) {
for {
b, ok := next()
if ok && rate.Rate() > rng.Float64() {
continue
}
return b, ok
}
}
})
}