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package mc
import (
"context"
"io"
"io/ioutil"
"net/http"
"fmt"
)
var chunkSize int = 5000
type MeasurableConnection interface {
Start(context.Context) bool
Transferred() uint64
}
type LoadBearingDownload struct {
Path string
downloaded uint64
client *http.Client
}
func (lbd *LoadBearingDownload) Transferred() uint64 {
return lbd.downloaded
}
func (lbd *LoadBearingDownload) Start(ctx context.Context) bool {
lbd.downloaded = 0
lbd.client = &http.Client{}
fmt.Printf("Started a load bearing download.\n")
go doDownload(lbd.client, lbd.Path, &lbd.downloaded, ctx)
return true
}
func doDownload(client *http.Client, path string, count *uint64, ctx context.Context) {
get, err := client.Get(path)
if err != nil {
return
}
for ctx.Err() == nil {
n, err := io.CopyN(ioutil.Discard, get.Body, int64(chunkSize))
if err != nil {
break
}
*count += uint64(n)
}
get.Body.Close()
fmt.Printf("Ending a load-bearing download.\n");
}
type LoadBearingUpload struct {
Path string
uploaded uint64
client *http.Client
}
func (lbu *LoadBearingUpload) Transferred() uint64 {
return lbu.uploaded
}
type syntheticCountingReader struct {
n *uint64
ctx context.Context
}
func (s *syntheticCountingReader) Read(p []byte) (n int, err error) {
if s.ctx.Err() != nil {
return 0, io.EOF
}
err = nil
n = len(p)
n = chunkSize
*s.n += uint64(n)
return
}
func doUpload(client *http.Client, path string, count *uint64, ctx context.Context) bool {
*count = 0
s := &syntheticCountingReader{n: count, ctx: ctx}
resp, _ := client.Post(path, "application/octet-stream", s)
resp.Body.Close()
fmt.Printf("Ending a load-bearing upload.\n")
return true
}
func (lbu *LoadBearingUpload) Start(ctx context.Context) bool {
lbu.uploaded = 0
lbu.client = &http.Client{}
fmt.Printf("Started a load bearing upload.\n")
go doUpload(lbu.client, lbu.Path, &lbu.uploaded, ctx)
return true
}
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