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log.go
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log.go
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package nitro
import (
"context"
"log"
"net"
"os"
"github.com/brave-intl/bat-go/libs/closers"
"github.com/mdlayher/vsock"
)
// VsockWriter - structure definition of a vsock writer
type VsockWriter struct {
socket net.Conn
addr string
}
// NewVsockWriter - create a new vsock writer
func NewVsockWriter(addr string) *VsockWriter {
return &VsockWriter{
socket: nil,
addr: addr,
}
}
// Connect - interface implementation for connect method for VsockWriter
func (w *VsockWriter) Connect() error {
if w.socket == nil {
s, err := DialContext(context.Background(), "tcp", w.addr)
if err != nil {
return err
}
w.socket = s
}
return nil
}
// Close - interface implementation of closer for VsockWriter
func (w VsockWriter) Close() error {
if w.socket != nil {
return w.socket.Close()
}
return nil
}
// Write -interface implementation of writer for VsockWriter
func (w VsockWriter) Write(p []byte) (n int, err error) {
if w.socket == nil {
err = w.Connect()
if err != nil {
return -1, err
}
}
n, err = w.socket.Write(p)
if err != nil {
// Our socket must have disconnected, reset our connection
w.socket = nil
return n, err
}
return n, nil
}
// VsockLogServer - implementation of a log server over vsock
type VsockLogServer struct {
baseCtx context.Context
port uint32
}
// NewVsockLogServer - create a new VsockLogServer
func NewVsockLogServer(ctx context.Context, port uint32) VsockLogServer {
return VsockLogServer{
baseCtx: ctx,
port: port,
}
}
// Serve - interface implementation for Serve for VsockLogServer
func (s VsockLogServer) Serve(l net.Listener) error {
if l == nil {
var err error
l, err = vsock.Listen(s.port, &vsock.Config{})
if err != nil {
log.Panicln(err)
}
defer closers.Panic(s.baseCtx, l)
}
log.Printf("Listening to connections on vsock port %d\n", s.port)
for {
conn, err := l.Accept()
if err != nil {
log.Panicln(err)
}
go handleLogConn(s.baseCtx, conn)
}
}
func handleLogConn(ctx context.Context, conn net.Conn) {
log.Println("Accepted connection.")
defer closers.Panic(ctx, conn)
defer log.Println("Closed connection.")
for {
buf := make([]byte, 1024)
size, err := conn.Read(buf)
if err != nil {
return
}
if _, err := os.Stdout.Write(buf[:size]); err != nil {
log.Printf("failed to write: %s", err.Error())
}
}
}