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|
package lbc
import (
"context"
"fmt"
"io"
"io/ioutil"
"net/http"
"sync/atomic"
)
var chunkSize int = 5000
type LoadBearingConnection interface {
Start(context.Context, bool) bool
Transferred() uint64
Client() *http.Client
IsValid() bool
}
type LoadBearingConnectionDownload struct {
Path string
downloaded uint64
client *http.Client
debug bool
valid bool
}
func (lbd *LoadBearingConnectionDownload) Transferred() uint64 {
transferred := atomic.LoadUint64(&lbd.downloaded)
if lbd.debug {
fmt.Printf("download: Transferred: %v\n", transferred)
}
return transferred
}
func (lbd *LoadBearingConnectionDownload) Client() *http.Client {
return lbd.client
}
type countingReader struct {
n *uint64
ctx context.Context
readable io.Reader
}
func (cr *countingReader) Read(p []byte) (n int, err error) {
if cr.ctx.Err() != nil {
return 0, io.EOF
}
n, err = cr.readable.Read(p)
*cr.n += uint64(n)
return
}
func (lbd *LoadBearingConnectionDownload) Start(ctx context.Context, debug bool) bool {
lbd.downloaded = 0
lbd.client = &http.Client{}
lbd.debug = debug
lbd.valid = true
// At some point this might be useful: It is a snippet of code that will enable
// logging of per-session TLS key material in order to make debugging easier in
// Wireshark.
/*
lbd.client = &http.Client{
Transport: &http2.Transport{
TLSClientConfig: &tls.Config{
KeyLogWriter: w,
Rand: utilities.RandZeroSource{}, // for reproducible output; don't do this.
InsecureSkipVerify: true, // test server certificate is not trusted.
},
},
}
*/
if debug {
fmt.Printf("Started a load-bearing download.\n")
}
go lbd.doDownload(ctx)
return true
}
func (lbd *LoadBearingConnectionDownload) IsValid() bool {
return lbd.valid
}
func (lbd *LoadBearingConnectionDownload) doDownload(ctx context.Context) {
get, err := lbd.client.Get(lbd.Path)
if err != nil {
lbd.valid = false
return
}
buff := make([]byte, 500*1024*1024)
cr := &countingReader{n: &lbd.downloaded, ctx: ctx, readable: get.Body}
_, _ = io.CopyBuffer(ioutil.Discard, cr, buff)
lbd.valid = false
get.Body.Close()
if lbd.debug {
fmt.Printf("Ending a load-bearing download.\n")
}
}
type LoadBearingConnectionUpload struct {
Path string
uploaded uint64
client *http.Client
debug bool
valid bool
}
func (lbu *LoadBearingConnectionUpload) Transferred() uint64 {
transferred := atomic.LoadUint64(&lbu.uploaded)
if lbu.debug {
fmt.Printf("upload: Transferred: %v\n", transferred)
}
return transferred
}
func (lbu *LoadBearingConnectionUpload) Client() *http.Client {
return lbu.client
}
func (lbu *LoadBearingConnectionUpload) IsValid() bool {
return lbu.valid
}
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
atomic.AddUint64(s.n, uint64(n))
return
}
func (lbu *LoadBearingConnectionUpload) doUpload(ctx context.Context) bool {
lbu.uploaded = 0
s := &syntheticCountingReader{n: &lbu.uploaded, ctx: ctx}
if resp, err := lbu.client.Post(lbu.Path, "application/octet-stream", s); err == nil {
resp.Body.Close()
}
lbu.valid = false
if lbu.debug {
fmt.Printf("Ending a load-bearing upload.\n")
}
return true
}
func (lbu *LoadBearingConnectionUpload) Start(ctx context.Context, debug bool) bool {
lbu.uploaded = 0
lbu.client = &http.Client{}
lbu.debug = debug
lbu.valid = true
if debug {
fmt.Printf("Started a load-bearing upload.\n")
}
go lbu.doUpload(ctx)
return true
}
|
