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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 2 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 Go Responsiveness. If not, see <https://www.gnu.org/licenses/>.
*/
package lgc
import (
"context"
"crypto/tls"
"fmt"
"io"
"net/http"
"sync"
"sync/atomic"
"time"
"github.com/network-quality/goresponsiveness/debug"
"github.com/network-quality/goresponsiveness/stats"
"github.com/network-quality/goresponsiveness/utilities"
)
// TODO: All 64-bit fields that are accessed atomically must
// appear at the top of this struct.
type LoadGeneratingConnectionUpload struct {
uploaded uint64
lastIntervalEnd int64
URL string
ConnectToAddr string
uploadStartTime time.Time
lastUploaded uint64
client *http.Client
debug debug.DebugLevel
InsecureSkipVerify bool
KeyLogger io.Writer
clientId uint64
status LgcStatus
statusLock *sync.Mutex
statusWaiter *sync.Cond
}
func NewLoadGeneratingConnectionUpload(url string, keyLogger io.Writer, connectToAddr string, insecureSkipVerify bool) LoadGeneratingConnectionUpload {
lgu := LoadGeneratingConnectionUpload{
URL: url,
KeyLogger: keyLogger,
ConnectToAddr: connectToAddr,
InsecureSkipVerify: insecureSkipVerify,
statusLock: &sync.Mutex{},
}
lgu.status = LGC_STATUS_NOT_STARTED
lgu.statusWaiter = sync.NewCond(lgu.statusLock)
return lgu
}
func (lgu *LoadGeneratingConnectionUpload) WaitUntilStarted(ctxt context.Context) bool {
conditional := func() bool { return lgu.status != LGC_STATUS_NOT_STARTED }
go utilities.ContextSignaler(ctxt, 500*time.Millisecond, &conditional, lgu.statusWaiter)
return utilities.WaitWithContext(ctxt, &conditional, lgu.statusLock, lgu.statusWaiter)
}
func (lgu *LoadGeneratingConnectionUpload) ClientId() uint64 {
return lgu.clientId
}
func (lgu *LoadGeneratingConnectionUpload) TransferredInInterval() (uint64, time.Duration) {
transferred := atomic.SwapUint64(&lgu.uploaded, 0)
newIntervalEnd := (time.Now().Sub(lgu.uploadStartTime)).Nanoseconds()
previousIntervalEnd := atomic.SwapInt64(&lgu.lastIntervalEnd, newIntervalEnd)
intervalLength := time.Duration(newIntervalEnd - previousIntervalEnd)
if debug.IsDebug(lgu.debug) {
fmt.Printf("upload: Transferred: %v bytes in %v.\n", transferred, intervalLength)
}
return transferred, intervalLength
}
func (lgu *LoadGeneratingConnectionUpload) Client() *http.Client {
return lgu.client
}
func (lgu *LoadGeneratingConnectionUpload) Status() LgcStatus {
return lgu.status
}
func (lgd *LoadGeneratingConnectionUpload) Direction() LgcDirection {
return LGC_UP
}
type syntheticCountingReader struct {
n *uint64
ctx context.Context
lgu *LoadGeneratingConnectionUpload
}
func (s *syntheticCountingReader) Read(p []byte) (n int, err error) {
if s.ctx.Err() != nil {
return 0, io.EOF
}
if *s.n == 0 {
s.lgu.statusLock.Lock()
s.lgu.status = LGC_STATUS_RUNNING
s.lgu.statusWaiter.Broadcast()
s.lgu.statusLock.Unlock()
}
err = nil
n = len(p)
atomic.AddUint64(s.n, uint64(n))
return
}
func (lgu *LoadGeneratingConnectionUpload) doUpload(ctx context.Context) error {
lgu.uploaded = 0
s := &syntheticCountingReader{n: &lgu.uploaded, ctx: ctx, lgu: lgu}
var resp *http.Response = nil
var request *http.Request = nil
var err error
if request, err = http.NewRequest(
"POST",
lgu.URL,
s,
); err != nil {
lgu.statusLock.Lock()
lgu.status = LGC_STATUS_ERROR
lgu.statusWaiter.Broadcast()
lgu.statusLock.Unlock()
return err
}
// Used to disable compression
request.Header.Set("Accept-Encoding", "identity")
request.Header.Set("User-Agent", utilities.UserAgent())
lgu.uploadStartTime = time.Now()
lgu.lastIntervalEnd = 0
lgu.statusLock.Lock()
lgu.status = LGC_STATUS_RUNNING
lgu.statusWaiter.Broadcast()
lgu.statusLock.Unlock()
if resp, err = lgu.client.Do(request); err != nil {
lgu.statusLock.Lock()
lgu.status = LGC_STATUS_ERROR
lgu.statusWaiter.Broadcast()
lgu.statusLock.Unlock()
return err
}
lgu.statusLock.Lock()
lgu.status = LGC_STATUS_DONE
lgu.statusWaiter.Broadcast()
lgu.statusLock.Unlock()
resp.Body.Close()
if debug.IsDebug(lgu.debug) {
fmt.Printf("Ending a load-generating upload.\n")
}
return nil
}
func (lgu *LoadGeneratingConnectionUpload) Start(
parentCtx context.Context,
debugLevel debug.DebugLevel,
) bool {
lgu.uploaded = 0
lgu.clientId = utilities.GenerateUniqueId()
lgu.debug = debugLevel
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: lgu.InsecureSkipVerify,
},
}
if !utilities.IsInterfaceNil(lgu.KeyLogger) {
if debug.IsDebug(lgu.debug) {
fmt.Printf(
"Using an SSL Key Logger for this load-generating upload.\n",
)
}
transport.TLSClientConfig.KeyLogWriter = lgu.KeyLogger
}
utilities.OverrideHostTransport(transport, lgu.ConnectToAddr)
lgu.client = &http.Client{Transport: transport}
if debug.IsDebug(lgu.debug) {
fmt.Printf("Started a load-generating upload (id: %v).\n", lgu.clientId)
}
go lgu.doUpload(parentCtx)
return true
}
func (lgu *LoadGeneratingConnectionUpload) Stats() *stats.TraceStats {
// Get all your stats from the download side of the LGC.
return nil
}
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