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package circuitbreaker_test
import (
"io/ioutil"
stdlog "log"
"testing"
"time"
"github.com/afex/hystrix-go/hystrix"
"github.com/go-kit/kit/circuitbreaker"
)
func TestHystrix(t *testing.T) {
stdlog.SetOutput(ioutil.Discard)
const (
commandName = "my-endpoint"
errorPercent = 5
maxConcurrent = 1000
)
hystrix.ConfigureCommand(commandName, hystrix.CommandConfig{
ErrorPercentThreshold: errorPercent,
MaxConcurrentRequests: maxConcurrent,
})
var (
breaker = circuitbreaker.Hystrix(commandName)
primeWith = hystrix.DefaultVolumeThreshold * 2
shouldPass = func(n int) bool { return (float64(n) / float64(primeWith+n)) <= (float64(errorPercent-1) / 100.0) }
openCircuitError = hystrix.ErrCircuitOpen.Error()
)
// hystrix-go uses buffered channels to receive reports on request success/failure,
// and so is basically impossible to test deterministically. We have to make sure
// the report buffer is emptied, by injecting a sleep between each invocation.
requestDelay := 5 * time.Millisecond
testFailingEndpoint(t, breaker, primeWith, shouldPass, requestDelay, openCircuitError)
}
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