2024-07-18 17:15:15 +00:00
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//go:build p2p
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// +build p2p
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package p2p
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import (
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"context"
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"errors"
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"fmt"
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2024-10-03 16:38:41 +00:00
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"io"
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2024-07-18 17:15:15 +00:00
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"net"
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"github.com/mudler/edgevpn/pkg/node"
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"github.com/rs/zerolog/log"
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)
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func (f *FederatedServer) Start(ctx context.Context) error {
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n, err := NewNode(f.p2ptoken)
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if err != nil {
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return fmt.Errorf("creating a new node: %w", err)
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}
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err = n.Start(ctx)
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if err != nil {
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return fmt.Errorf("creating a new node: %w", err)
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}
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if err := ServiceDiscoverer(ctx, n, f.p2ptoken, f.service, func(servicesID string, tunnel NodeData) {
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log.Debug().Msgf("Discovered node: %s", tunnel.ID)
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2024-08-20 12:45:36 +00:00
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}, false); err != nil {
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2024-07-18 17:15:15 +00:00
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return err
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}
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return f.proxy(ctx, n)
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}
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func (fs *FederatedServer) proxy(ctx context.Context, node *node.Node) error {
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log.Info().Msgf("Allocating service '%s' on: %s", fs.service, fs.listenAddr)
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// Open local port for listening
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l, err := net.Listen("tcp", fs.listenAddr)
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if err != nil {
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log.Error().Err(err).Msg("Error listening")
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return err
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}
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2024-10-03 16:38:41 +00:00
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2024-08-17 06:28:52 +00:00
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go func() {
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<-ctx.Done()
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l.Close()
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}()
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2024-08-20 12:45:36 +00:00
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nodeAnnounce(ctx, node)
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2024-07-18 17:15:15 +00:00
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defer l.Close()
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for {
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select {
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case <-ctx.Done():
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return errors.New("context canceled")
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default:
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2024-08-13 14:17:18 +00:00
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log.Debug().Msgf("New connection from %s", l.Addr().String())
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2024-07-18 17:15:15 +00:00
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// Listen for an incoming connection.
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conn, err := l.Accept()
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if err != nil {
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fmt.Println("Error accepting: ", err.Error())
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continue
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}
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// Handle connections in a new goroutine, forwarding to the p2p service
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go func() {
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workerID := ""
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if fs.workerTarget != "" {
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workerID = fs.workerTarget
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2024-08-13 14:17:18 +00:00
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} else if fs.loadBalanced {
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log.Debug().Msgf("Load balancing request")
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2024-07-18 21:18:53 +00:00
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2024-08-20 12:45:36 +00:00
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workerID = fs.SelectLeastUsedServer()
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if workerID == "" {
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2024-08-16 17:34:36 +00:00
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log.Debug().Msgf("Least used server not found, selecting random")
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workerID = fs.RandomServer()
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}
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} else {
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workerID = fs.RandomServer()
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}
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2024-08-20 12:45:36 +00:00
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if workerID == "" {
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log.Error().Msg("No available nodes yet")
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2024-10-03 16:38:41 +00:00
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fs.sendHTMLResponse(conn, 503, "Sorry, waiting for nodes to connect")
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return
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}
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2024-08-20 12:45:36 +00:00
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log.Debug().Msgf("Selected node %s", workerID)
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nodeData, exists := GetNode(fs.service, workerID)
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if !exists {
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log.Error().Msgf("Node %s not found", workerID)
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fs.sendHTMLResponse(conn, 404, "Node not found")
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return
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}
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2024-08-20 12:45:36 +00:00
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proxyP2PConnection(ctx, node, nodeData.ServiceID, conn)
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if fs.loadBalanced {
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fs.RecordRequest(workerID)
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}
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2024-07-18 17:15:15 +00:00
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}()
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}
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}
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}
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2024-10-03 16:38:41 +00:00
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// sendHTMLResponse sends a basic HTML response with a status code and a message.
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// This is extracted to make the HTML content maintainable.
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func (fs *FederatedServer) sendHTMLResponse(conn net.Conn, statusCode int, message string) {
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defer conn.Close()
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// Define the HTML content separately for easier maintenance.
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htmlContent := fmt.Sprintf("<html><body><h1>%s</h1></body></html>\r\n", message)
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// Create the HTTP response with dynamic status code and content.
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response := fmt.Sprintf(
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"HTTP/1.1 %d %s\r\n"+
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"Content-Type: text/html\r\n"+
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"Connection: close\r\n"+
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"\r\n"+
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"%s",
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statusCode, getHTTPStatusText(statusCode), htmlContent,
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)
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// Write the response to the client connection.
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_, writeErr := io.WriteString(conn, response)
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if writeErr != nil {
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log.Error().Err(writeErr).Msg("Error writing response to client")
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}
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}
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// getHTTPStatusText returns a textual representation of HTTP status codes.
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func getHTTPStatusText(statusCode int) string {
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switch statusCode {
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case 503:
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return "Service Unavailable"
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case 404:
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return "Not Found"
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case 200:
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return "OK"
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default:
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return "Unknown Status"
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}
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}
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