45 lines
913 B
Go
45 lines
913 B
Go
package mock
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import (
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"context"
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"math/rand"
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"time"
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"github.com/pkg/errors"
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)
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var (
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// channel.go @ simulateAustralianInternet
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internetCanFail = true
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// 500ms ~ 3s
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internetMinLatency = 500
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internetMaxLatency = 3000
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)
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// ErrTimedOut is returned when the simulated IO decides to fail.
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var ErrTimedOut = errors.New("Australian Internet unsupported.")
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// simulate network latency
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func simulateAustralianInternet() error {
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return simulateAustralianInternetCtx(context.Background())
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}
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func simulateAustralianInternetCtx(ctx context.Context) (err error) {
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var ms = randClamp(internetMinLatency, internetMaxLatency)
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select {
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case <-time.After(time.Duration(ms) * time.Millisecond):
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// noop
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case <-ctx.Done():
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return ctx.Err()
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}
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// because australia, drop packet 20% of the time if internetCanFail is
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// true.
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if internetCanFail && rand.Intn(100) < 20 {
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return ErrTimedOut
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}
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return nil
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}
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