mirror of https://github.com/schollz/croc.git
135 lines
3.3 KiB
Go
135 lines
3.3 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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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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)
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func runServer() {
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logger := log.WithFields(log.Fields{
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"function": "main",
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})
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logger.Info("Initializing")
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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 listenerThread(id, &wg)
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}
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wg.Wait()
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}
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func listenerThread(id int, wg *sync.WaitGroup) {
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logger := log.WithFields(log.Fields{
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"function": "listenerThread@" + serverAddress + ":" + strconv.Itoa(27000+id),
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})
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defer wg.Done()
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err := listener(id)
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if err != nil {
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logger.Error(err)
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}
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}
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func listener(id int) (err error) {
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port := strconv.Itoa(27001 + id)
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logger := log.WithFields(log.Fields{
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"function": "listener@" + serverAddress + ":" + port,
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})
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server, err := net.Listen("tcp", serverAddress+":"+port)
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if err != nil {
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return errors.Wrap(err, "Error listening on "+serverAddress+":"+port)
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}
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defer server.Close()
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logger.Info("waiting for connections")
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//Spawn a new goroutine whenever a client connects
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for {
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connection, err := server.Accept()
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if err != nil {
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return errors.Wrap(err, "problem accepting connection")
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}
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logger.Infof("Client %s connected", connection.RemoteAddr().String())
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go sendFileToClient(id, connection)
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}
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}
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//This function is to 'fill'
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func fillString(retunString string, toLength int) string {
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for {
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lengthString := len(retunString)
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if lengthString < toLength {
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retunString = retunString + ":"
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continue
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}
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break
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}
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return retunString
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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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