mirror of https://github.com/schollz/croc.git
128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
package main
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import (
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"fmt"
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"io"
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"math"
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"net"
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"os"
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"strconv"
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"sync"
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"time"
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log "github.com/sirupsen/logrus"
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)
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// runClient spawns threads for parallel uplink/downlink via TCP
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func runClient(connectionType string, codePhrase string) {
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logger := log.WithFields(log.Fields{
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"codePhrase": codePhrase,
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"connection": connectionType,
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})
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var wg sync.WaitGroup
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wg.Add(numberConnections)
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for id := 0; id < numberConnections; id++ {
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go func(id int) {
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defer wg.Done()
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port := strconv.Itoa(27001 + id)
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connection, err := net.Dial("tcp", "localhost:"+port)
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if err != nil {
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panic(err)
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}
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defer connection.Close()
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message := receiveMessage(connection)
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logger.Infof("message: %s", message)
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sendMessage(connectionType+"."+codePhrase, connection)
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if connectionType == "s" {
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logger.Info("waiting for ok from relay")
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message = receiveMessage(connection)
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logger.Info("got ok from relay")
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// wait for pipe to be made
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time.Sleep(1 * time.Second)
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// Send file name
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logger.Info("sending filename")
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sendMessage("filename", connection)
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// Send file size
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time.Sleep(3 * time.Second)
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logger.Info("sending filesize")
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sendMessage("filesize", connection)
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// TODO: Write data from file
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// TODO: Release from connection pool
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// POST /release
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} else {
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fileName := receiveMessage(connection)
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fileSize := receiveMessage(connection)
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logger.Infof("fileName: %s", fileName)
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logger.Infof("fileSize: %s", fileSize)
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// TODO: Pull data and write to file
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// TODO: Release from connection pool
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// POST /release
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}
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}(id)
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}
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wg.Wait()
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}
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func sendFileToClient(id int, connection net.Conn) {
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logger := log.WithFields(log.Fields{
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"function": "sendFileToClient #" + strconv.Itoa(id),
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})
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defer connection.Close()
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//Open the file that needs to be send to the client
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file, err := os.Open(fileName)
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if err != nil {
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fmt.Println(err)
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return
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}
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defer file.Close()
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//Get the filename and filesize
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fileInfo, err := file.Stat()
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if err != nil {
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fmt.Println(err)
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return
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}
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numChunks := math.Ceil(float64(fileInfo.Size()) / float64(BUFFERSIZE))
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chunksPerWorker := int(math.Ceil(numChunks / float64(numberConnections)))
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bytesPerConnection := int64(chunksPerWorker * BUFFERSIZE)
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if id+1 == numberConnections {
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bytesPerConnection = fileInfo.Size() - (numberConnections-1)*bytesPerConnection
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}
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fileSize := fillString(strconv.FormatInt(int64(bytesPerConnection), 10), 10)
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fileName := fillString(fileInfo.Name(), 64)
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if id == 0 || id == numberConnections-1 {
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logger.Infof("numChunks: %v", numChunks)
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logger.Infof("chunksPerWorker: %v", chunksPerWorker)
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logger.Infof("bytesPerConnection: %v", bytesPerConnection)
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logger.Infof("fileName: %v", fileInfo.Name())
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}
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logger.Info("sending")
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connection.Write([]byte(fileSize))
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connection.Write([]byte(fileName))
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sendBuffer := make([]byte, BUFFERSIZE)
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chunkI := 0
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for {
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_, err = file.Read(sendBuffer)
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if err == io.EOF {
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//End of file reached, break out of for loop
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logger.Info("EOF")
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break
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}
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if (chunkI >= chunksPerWorker*id && chunkI < chunksPerWorker*id+chunksPerWorker) || (id == numberConnections-1 && chunkI >= chunksPerWorker*id) {
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connection.Write(sendBuffer)
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}
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chunkI++
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}
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fmt.Println("File has been sent, closing connection!")
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return
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}
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