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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 lbc
import (
"context"
"crypto/tls"
"fmt"
"io"
"io/ioutil"
"net/http"
"sync/atomic"
"github.com/network-quality/goresponsiveness/utilities"
"golang.org/x/net/http2"
)
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
KeyLogger io.Writer
}
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)
atomic.AddUint64(cr.n, uint64(n))
return
}
func (lbd *LoadBearingConnectionDownload) Start(
ctx context.Context,
debug bool,
) bool {
lbd.downloaded = 0
transport := http2.Transport{}
if !utilities.IsInterfaceNil(lbd.KeyLogger) {
if debug {
fmt.Printf(
"Using an SSL Key Logger for this load-bearing download.\n",
)
}
// The presence of a custom TLSClientConfig in a *generic* `transport`
// means that go will default to HTTP/1.1 and cowardly avoid HTTP/2:
// https://github.com/golang/go/blob/7ca6902c171b336d98adbb103d701a013229c806/src/net/http/transport.go#L278
// Also, it would appear that the API's choice of HTTP vs HTTP2 can
// depend on whether the url contains
// https:// or http://:
// https://github.com/golang/go/blob/7ca6902c171b336d98adbb103d701a013229c806/src/net/http/transport.go#L74
transport.TLSClientConfig = &tls.Config{
KeyLogWriter: lbd.KeyLogger,
InsecureSkipVerify: true,
}
}
lbd.client = &http.Client{Transport: &transport}
lbd.debug = debug
lbd.valid = true
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
}
cr := &countingReader{n: &lbd.downloaded, ctx: ctx, readable: get.Body}
_, _ = io.Copy(ioutil.Discard, cr)
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
KeyLogger io.Writer
}
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)
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}
var resp *http.Response = nil
var err error
if resp, err = lbu.client.Post(lbu.Path, "application/octet-stream", s); err != nil {
lbu.valid = false
}
resp.Body.Close()
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
// See above for the rationale of doing http2.Transport{} here
// to ensure that we are using h2.
transport := http2.Transport{}
if !utilities.IsInterfaceNil(lbu.KeyLogger) {
if debug {
fmt.Printf(
"Using an SSL Key Logger for this load-bearing upload.\n",
)
}
transport.TLSClientConfig = &tls.Config{
KeyLogWriter: lbu.KeyLogger,
InsecureSkipVerify: true,
}
}
lbu.client = &http.Client{Transport: &transport}
lbu.debug = debug
lbu.valid = true
if debug {
fmt.Printf("Started a load-bearing upload.\n")
}
go lbu.doUpload(ctx)
return true
}
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