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package utilities
import (
"context"
"io"
"math"
"net/http"
"time"
)
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
}
type GetLatency struct {
Delay time.Duration
Err error
}
func TimedSequentialGets(ctx context.Context, client_a *http.Client, client_b *http.Client, url string) chan GetLatency {
responseChannel := make(chan GetLatency)
go func() {
before := time.Now()
c_a, err := client_a.Get(url)
if err != nil {
responseChannel <- GetLatency{Delay: 0, Err: err}
}
// TODO: Make this interruptable somehow by using _ctx_.
_, err = io.ReadAll(c_a.Body)
if err != nil {
responseChannel <- GetLatency{Delay: 0, Err: err}
}
c_b, err := client_b.Get(url)
if err != nil {
responseChannel <- GetLatency{Delay: 0, Err: err}
}
// TODO: Make this interruptable somehow by using _ctx_.
_, err = io.ReadAll(c_b.Body)
if err != nil {
responseChannel <- GetLatency{Delay: 0, Err: err}
}
responseChannel <- GetLatency{Delay: time.Now().Sub(before), Err: nil}
}()
return responseChannel
}
type RandZeroSource struct{}
func (RandZeroSource) Read(b []byte) (n int, err error) {
for i := range b {
b[i] = 0
}
return len(b), nil
}
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