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package mc
import (
"context"
"fmt"
"io"
"io/ioutil"
"net/http"
)
type MeasurableConnection interface {
Start(context.Context) bool
Stop() bool
Downloaded() uint64
}
type LoadBearingConnection struct {
Path string
ctx context.Context
cancel context.CancelFunc
downloaded uint64
client *http.Client
}
func (lbc *LoadBearingConnection) Downloaded() uint64 {
return lbc.downloaded
}
func (lbc *LoadBearingConnection) Start(ctx context.Context) bool {
fmt.Printf("Starting a LBC ...")
lbc.ctx, lbc.cancel = context.WithCancel(ctx)
lbc.downloaded = 0
lbc.client = &http.Client{}
get, err := lbc.client.Get(lbc.Path)
if err != nil {
return false
}
go doDownload(get, &lbc.downloaded, lbc.ctx)
return true
}
func (lbc *LoadBearingConnection) Stop() bool {
lbc.cancel()
return true
}
func doDownload(get *http.Response, count *uint64, ctx context.Context) {
for ctx.Err() == nil {
n, err := io.CopyN(ioutil.Discard, get.Body, 1024*1024)
if err != nil {
fmt.Printf("Done reading!\n")
break
}
fmt.Printf("Read some bytes: %d\n", n)
*count += uint64(n)
}
fmt.Printf("Cancelling my download.\n")
get.Body.Close()
}
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