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main.go
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main.go
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package main
import (
"fmt"
"math/rand"
"os"
"sync"
"sync/atomic"
"time"
"github.com/tal-tech/go-zero/core/breaker"
"github.com/tal-tech/go-zero/core/lang"
"github.com/tal-tech/go-zero/core/logx"
"gopkg.in/cheggaaa/pb.v1"
)
const (
duration = time.Minute * 5
breakRange = 20
workRange = 50
requestInterval = time.Millisecond
// multiply to make it visible in plot
stateFator = float64(time.Second/requestInterval) / 2
)
type (
server struct {
state int32
}
metric struct {
calls int64
}
)
func (m *metric) addCall() {
atomic.AddInt64(&m.calls, 1)
}
func (m *metric) reset() int64 {
return atomic.SwapInt64(&m.calls, 0)
}
func newServer() *server {
return &server{}
}
func (s *server) serve(m *metric) bool {
m.addCall()
return atomic.LoadInt32(&s.state) == 1
}
func (s *server) start() {
go func() {
r := rand.New(rand.NewSource(time.Now().UnixNano()))
var state int32
for {
var v int32
if state == 0 {
v = r.Int31n(breakRange)
} else {
v = r.Int31n(workRange)
}
time.Sleep(time.Second * time.Duration(v+1))
state ^= 1
atomic.StoreInt32(&s.state, state)
}
}()
}
func runBreaker(s *server, br breaker.Breaker, duration time.Duration, m *metric) {
ticker := time.NewTicker(requestInterval)
defer ticker.Stop()
done := make(chan lang.PlaceholderType)
go func() {
time.Sleep(duration)
close(done)
}()
for {
select {
case <-ticker.C:
_ = br.Do(func() error {
if s.serve(m) {
return nil
} else {
return breaker.ErrServiceUnavailable
}
})
case <-done:
return
}
}
}
func main() {
srv := newServer()
srv.start()
gb := breaker.NewBreaker()
fp, err := os.Create("result.csv")
logx.Must(err)
defer fp.Close()
fmt.Fprintln(fp, "seconds,state,googleCalls,netflixCalls")
var gm, nm metric
go func() {
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
var seconds int
for range ticker.C {
seconds++
gcalls := gm.reset()
ncalls := nm.reset()
fmt.Fprintf(fp, "%d,%.2f,%d,%d\n",
seconds, float64(atomic.LoadInt32(&srv.state))*stateFator, gcalls, ncalls)
}
}()
var waitGroup sync.WaitGroup
waitGroup.Add(1)
go func() {
runBreaker(srv, gb, duration, &gm)
waitGroup.Done()
}()
go func() {
bar := pb.New(int(duration / time.Second)).Start()
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for range ticker.C {
bar.Increment()
}
bar.Finish()
}()
waitGroup.Wait()
}