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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"github.com/hawkinsw/goresponsiveness/ma"
"github.com/hawkinsw/goresponsiveness/mc"
_ "io"
"io/ioutil"
_ "log"
"net/http"
"time"
)
type ConfigUrls struct {
SmallUrl string `json:"small_https_download_url"`
LargeUrl string `json:"large_https_download_url"`
UploadUrl string `json:"https_upload_url"`
}
type Config struct {
Version int
Urls ConfigUrls `json:"urls"`
}
func (c *Config) String() string {
return fmt.Sprintf("Version: %d\nSmall URL: %s\nLarge URL: %s\nUpload URL: %s", c.Version, c.Urls.SmallUrl, c.Urls.LargeUrl, c.Urls.UploadUrl)
}
func toMBs(bytes float64) float64 {
return float64(bytes) / float64(1024*1024)
}
var (
// Variables to hold CLI arguments.
configHost = flag.String("config", "networkquality.example.com", "name/IP of responsiveness configuration server.")
configPort = flag.Int("port", 4043, "port number on which to access responsiveness configuration server.")
debug = flag.Bool("debug", false, "Enable debugging.")
)
func saturate(ctx context.Context, saturated chan<- interface{}, lbcGenerator func() mc.MeasurableConnection) {
mcs := make([]mc.MeasurableConnection, 4)
mcsPreviousTransferred := make([]uint64, 4)
for i := range mcs {
//mcs[i] = &mc.LoadBearingUpload{Path: config.Urls.UploadUrl}
mcs[i] = lbcGenerator()
mcsPreviousTransferred[i] = 0
if !mcs[i].Start(ctx) {
fmt.Printf("Error starting %dth MC!\n", i)
return
}
}
previousMovingAverage := float64(0)
movingAverage := ma.NewMovingAverage(4)
//lastFlowIncrease := uint64(0)
for currentIteration := uint64(0); true; currentIteration++ {
// If we are cancelled, then stop.
if ctx.Err() != nil {
return
}
time.Sleep(time.Second)
// 1. Calculate the most recent goodput.
totalTransfer := uint64(0)
for i := range mcs {
previousTransferred := mcsPreviousTransferred[i]
currentTransferred := mcs[i].Transferred()
totalTransfer += (currentTransferred - previousTransferred)
mcsPreviousTransferred[i] = currentTransferred
}
// 2. Calculate the delta
movingAverage.AddMeasurement(totalTransfer)
currentMovingAverage := movingAverage.CalculateAverage()
movingAverageDelta := ((currentMovingAverage - previousMovingAverage) / (float64(currentMovingAverage+previousMovingAverage) / 2.0)) * float64(100)
previousMovingAverage = currentMovingAverage
fmt.Printf("Instantaneous goodput: %f MB.\n", toMBs(float64(totalTransfer)))
fmt.Printf("Moving average: %f MB.\n", toMBs(currentMovingAverage))
fmt.Printf("Moving average delta: %f.\n", movingAverageDelta)
// 3. Are we stable or not?
if currentIteration != 0 && movingAverageDelta < float64(5) {
// We are stable!
fmt.Printf("Stable\n")
break
} else {
// We are unstable!
fmt.Printf("Unstable\n")
}
}
saturated <- struct{}{}
}
func main() {
flag.Parse()
configHostPort := fmt.Sprintf("%s:%d", *configHost, *configPort)
configUrl := fmt.Sprintf("https://%s/config", configHostPort)
configClient := &http.Client{}
resp, err := configClient.Get(configUrl)
if err != nil {
fmt.Printf("Error connecting to %s: %v\n", configHostPort, err)
return
}
jsonConfig, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("Error reading content downloaded from %s: %v\n", configUrl, err)
return
}
var config Config
err = json.Unmarshal(jsonConfig, &config)
if err != nil {
fmt.Printf("Error parsing configuration returned from %s: %v\n", configUrl, err)
return
}
if *debug {
fmt.Printf("Configuration: %s\n", &config)
}
operatingCtx, cancelOperatingCtx := context.WithCancel(context.Background())
uploadSaturationChannel := make(chan interface{})
g := func() mc.MeasurableConnection {
return &mc.LoadBearingDownload{Path: config.Urls.LargeUrl}
}
go saturate(operatingCtx, uploadSaturationChannel, g)
select {
case <-uploadSaturationChannel:
{
fmt.Printf("upload is saturated!\n")
}
}
time.Sleep(10 * time.Second)
cancelOperatingCtx()
time.Sleep(4 * time.Second)
}
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