- request->fileid file size chunksize and chunk information
- add the received file to the metadata of the peer
- make a mechanism to combine all the chunks and verify the file with the hash id
- Encryption od daata while transfering
- Register the file received peer to the Central server chunks information
- Ensure that load balancing is happening as Thought
To enhance your P2P file transfer CLI application, you can consider adding the following features:
- Progress Reporting: Show progress of file transfers.
- Encryption: Encrypt data during transfer for security.
- Resumable Transfers: Allow pausing and resuming of file transfers.
- Peer Discovery: Implement dynamic peer discovery instead of static IP addresses.
- File Integrity Check: Verify the integrity of transferred files using hashes.
- Peer Status Monitoring: Monitor the status of connected peers.
- Concurrency Control: Limit the number of concurrent transfers.
- File Search: Allow searching for files available on the network.
- Logging: Implement detailed logging for debugging and auditing.
- Configuration Management: Add support for configuration files and environment variables.
- Web Interface: Provide a web interface for users to interact with the system.
- File Compression: Compress files before transfer to save bandwidth.
You can use a library like progressbar to show transfer progress.
import (
"github.com/schollz/progressbar/v3"
)
func (p *PeerServer) fileRequest(fileId string, chunkIndex uint32, peerAddr string, chunkHash string) error {
// ... previous code ...
bar := progressbar.NewOptions64(
fileSize,
progressbar.OptionSetDescription(fmt.Sprintf("Downloading chunk %d", chunkId)),
progressbar.OptionSetTheme(progressbar.Theme{
Saucer: "[green]=",
SaucerHead: "[green]>",
SaucerPadding: " ",
BarStart: "[",
BarEnd: "]",
}),
)
if _, err := io.Copy(io.MultiWriter(file, bar), peer); err != nil {
log.Printf("Failed to copy file: %v\n", err)
panic("Error ")
}
log.Printf("Successfully received and saved chunk_%d.chunk\n", chunkId)
return nil
}Use a library like crypto to encrypt/decrypt data.
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"io"
)
func encrypt(data []byte, passphrase string) ([]byte, error) {
block, err := aes.NewCipher([]byte(passphrase))
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
return nil, err
}
ciphertext := gcm.Seal(nonce, nonce, data, nil)
return ciphertext, nil
}
func decrypt(data []byte, passphrase string) ([]byte, error) {
block, err := aes.NewCipher([]byte(passphrase))
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
nonceSize := gcm.NonceSize()
nonce, ciphertext := data[:nonceSize], data[nonceSize:]
plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return nil, err
}
return plaintext, nil
}Implementing resumable transfers requires tracking the progress of each file and chunk. You can store metadata about the transfer status and resume from the last known state.
import (
"encoding/json"
"os"
)
type TransferStatus struct {
FileID string
ChunkIndex uint32
Offset int64
}
func saveTransferStatus(status TransferStatus) error {
file, err := os.Create(fmt.Sprintf("%s_transfer_status.json", status.FileID))
if err != nil {
return err
}
defer file.Close()
return json.NewEncoder(file).Encode(status)
}
func loadTransferStatus(fileID string) (TransferStatus, error) {
var status TransferStatus
file, err := os.Open(fmt.Sprintf("%s_transfer_status.json", fileID))
if err != nil {
return status, err
}
defer file.Close()
err = json.NewDecoder(file).Decode(&status)
return status, err
}You can use a discovery service or protocol like mDNS for peer discovery.
import (
"github.com/grandcat/zeroconf"
"context"
"log"
"time"
)
func discoverPeers(service string) {
resolver, err := zeroconf.NewResolver(nil)
if err != nil {
log.Fatalln("Failed to initialize resolver:", err)
}
entries := make(chan *zeroconf.ServiceEntry)
go func(results <-chan *zeroconf.ServiceEntry) {
for entry := range results {
log.Println(entry)
}
}(entries)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
err = resolver.Browse(ctx, service, "local.", entries)
if err != nil {
log.Fatalln("Failed to browse:", err)
}
<-ctx.Done()
}Verify the integrity of transferred files using hashes.
func verifyFile(filePath string, expectedHash string) bool {
file, err := os.Open(filePath)
if err != nil {
return false
}
defer file.Close()
hash := sha256.New()
if _, err := io.Copy(hash, file); err != nil {
return false
}
return hex.EncodeToString(hash.Sum(nil)) == expectedHash
}package cmd
import (
"log"
"github.com/spf13/cobra"
)
var showProgress bool
var progressCmd = &cobra.Command{
Use: "progress",
Short: "Show progress of file transfers",
Run: func(cmd *cobra.Command, args []string) {
if showProgress {
// Implement progress reporting logic here
log.Println("Showing progress...")
} else {
log.Println("Progress reporting is disabled.")
}
},
}
func init() {
rootCmd.AddCommand(progressCmd)
progressCmd.Flags().BoolVarP(&showProgress, "show", "s", false, "Show progress of file transfers")
}package cmd
import (
"log"
"github.com/spf13/cobra"
)
var passphrase string
var encryptCmd = &cobra.Command{
Use: "encrypt",
Short: "Encrypt files before transfer",
Run: func(cmd *cobra.Command, args []string) {
// Implement encryption logic here
log.Println("Encrypting files with passphrase:", passphrase)
},
}
func init() {
rootCmd.AddCommand(encryptCmd)
encryptCmd.Flags().StringVarP(&passphrase, "passphrase", "p", "", "Passphrase for encryption")
encryptCmd.MarkFlagRequired("passphrase")
}By adding these features, you can significantly enhance the functionality and usability of your P2P file transfer application. The cobra CLI framework helps in organizing commands and subcommands, making your application more user-friendly and extensible.