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/*
* This file is part of Go Responsiveness.
*
* Go Responsiveness is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
* Go Responsiveness is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with Foobar. If not, see <https://www.gnu.org/licenses/>.
*/
package utilities
import (
"context"
"io"
"math"
"net/http"
"os"
"reflect"
"time"
"github.com/network-quality/goresponsiveness/constants"
)
func IsInterfaceNil(ifc interface{}) bool {
return ifc == nil ||
(reflect.ValueOf(ifc).Kind() == reflect.Ptr && reflect.ValueOf(ifc).IsNil())
}
func SignedPercentDifference(
current float64,
previous float64,
) (difference float64) {
return ((current - previous) / (float64(current+previous) / 2.0)) * float64(
100,
)
}
func AbsPercentDifference(
current float64,
previous float64,
) (difference float64) {
return (math.Abs(current-previous) / (float64(current+previous) / 2.0)) * float64(
100,
)
}
func Conditional(condition bool, t string, f string) string {
if condition {
return t
}
return f
}
func ToMbps(bytes float64) float64 {
return ToMBps(bytes) * float64(8)
}
func ToMBps(bytes float64) float64 {
return float64(bytes) / float64(1024*1024)
}
type GetLatency struct {
Delay time.Duration
RoundTripCount uint16
Err error
}
func CalculateSequentialRTTsTime(
ctx context.Context,
saturated_client *http.Client,
new_client *http.Client,
url string,
) chan GetLatency {
responseChannel := make(chan GetLatency)
go func() {
roundTripCount := uint16(0)
before := time.Now()
/*
TODO: We are not going to measure round-trip times on the load-generating connection
right now because we are dealing with a massive amount of buffer bloat on the
Apple CDN.
c_a, err := saturated_client.Get(url)
if err != nil {
responseChannel <- GetLatency{Delay: 0, RTTs: 0, Err: err}
return
}
// TODO: Make this interruptable somehow
// by using _ctx_.
_, err = io.ReadAll(c_a.Body)
if err != nil {
responseChannel <- GetLatency{Delay: 0, RTTs: 0, Err: err}
return
}
roundTripCount += 5
c_a.Body.Close()
*/
c_b, err := new_client.Get(url)
if err != nil {
responseChannel <- GetLatency{Delay: 0, RoundTripCount: 0, Err: err}
return
}
// TODO: Make this interruptable somehow by using _ctx_.
_, err = io.ReadAll(c_b.Body)
if err != nil {
responseChannel <- GetLatency{Delay: 0, Err: err}
return
}
c_b.Body.Close()
// We use 1 here according to the wording in 4.2.1.
roundTripCount += 1
responseChannel <- GetLatency{Delay: time.Since(before), RoundTripCount: roundTripCount, Err: nil}
}()
return responseChannel
}
func SeekForAppend(file *os.File) (err error) {
_, err = file.Seek(0, 2)
return
}
func IsDebug(level constants.DebugLevel) bool {
if level <= constants.Debug {
return true
}
return false
}
func IsWarn(level constants.DebugLevel) bool {
if level <= constants.Warn {
return true
}
return false
}
func IsError(level constants.DebugLevel) bool {
if level <= constants.Error {
return true
}
return false
}
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