(Sync Commit)

app/proxyman/inbound/unix.go

@@ -23,7 +23,10 @@ type UnixInboundHandler struct {
 func (uih *UnixInboundHandler) Start() {
  var err error
  uih.listenerHolder, err = domainsocket.ListenDS(uih.ctx, uih.path)
- newError(err).AtError().WriteToLog()
+ if err != nil {
+ newError(err).AtError().WriteToLog()
+ }
+
 }
 func (uih *UnixInboundHandler) Close() {
  if uih.listenerHolder != nil {

transport/internet/domainsocket/listener.go

@@ -3,24 +3,75 @@ package domainsocket
 import (
  "context"
  "net"
+ "os"
+ "syscall"
 )
 
 type Listener struct {
- ln net.Listener
+ ln net.Listener
+ listenerChan <-chan net.Conn
+ ctx context.Context
+ path string
+ lockfile os.File
 }
 
 func ListenDS(ctx context.Context, path string) (*Listener, error) {
+
+ vln := &Listener{path: path}
+ return vln, nil
+}
+
+func (ls *Listener) Down() error {
+ err := ls.ln.Close()
+ if err != nil {
+ newError(err).AtDebug().WriteToLog()
+ }
+ return err
+}
+
+//Setup systen level Listener
+func (ls *Listener) LowerUP() error {
+
+ if isUnixDomainSocketFileSystemBased(ls.path) && !___DEBUG_IGNORE_FLOCK {
+
+ }
+
  addr := new(net.UnixAddr)
- addr.Name = path
+ addr.Name = ls.path
  addr.Net = "unix"
  li, err := net.ListenUnix("unix", addr)
  if err != nil {
- return nil, err
+ return err
  }
- vln := &Listener{ln: li}
- return vln, nil
+
 }
 
-func (ls *Listener) Down() {
- ls.ln.Close()
+func isUnixDomainSocketFileSystemBased(path string) bool {
+ //No Branching
+ return path[0] != 0
 }
+
+func AcquireLock(lockfilepath string) (*os.File, error) {
+ f, err := os.Create(lockfilepath)
+ if err != nil {
+ newError(err).AtDebug().WriteToLog()
+ return f, err
+ }
+ err = syscall.Flock(int(f.Fd()), syscall.LOCK_EX)
+ if err != nil {
+ newError(err).AtDebug().WriteToLog()
+ err = f.Close()
+ if err != nil {
+ if ___DEBUG_PANIC_WHEN_ENCOUNTED_IMPOSSIBLE_ERROR {
+ panic(err)
+ }
+ newError(err).AtDebug().WriteToLog()
+ }
+ return nil, err
+ }
+}
+
+//DEBUG CONSTS
+const ___DEBUG_IGNORE_FLOCK = false
+const ___DEBUG_PANIC_WHEN_ERROR_UNPROPAGATEABLE = false
+const ___DEBUG_PANIC_WHEN_ENCOUNTED_IMPOSSIBLE_ERROR = false