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Code Issues Releases Wiki Activity

refactor: using callback instead of defer function

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This commit is contained in:
allo
2023-10-23 20:38:07 +01:00
committed by Xiaokang Wang (Shelikhoo)
parent 6593b88837
commit edff5c8e2d
1 changed files with 27 additions and 22 deletions
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transport/internet/system_listener.go
+27 -22
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@@ -56,9 +56,14 @@ func getControlFunc(ctx context.Context, sockopt *SocketConfig, controllers []co
}
}
func (dl *DefaultListener) Listen(ctx context.Context, addr net.Addr, sockopt *SocketConfig) (l net.Listener, err error) {
func (dl *DefaultListener) Listen(ctx context.Context, addr net.Addr, sockopt *SocketConfig) (net.Listener, error) {
var lc net.ListenConfig
var network, address string
// callback is called after the Listen function returns
// this is used to wrap the listener and do some post processing
callback := func(l net.Listener, err error) (net.Listener, error) {
return l, err
}
switch addr := addr.(type) {
case *net.TCPAddr:
network = addr.Network()
@@ -81,6 +86,7 @@ func (dl *DefaultListener) Listen(ctx context.Context, addr net.Addr, sockopt *S
}
} else {
// normal unix domain socket
var fileMode *os.FileMode
// parse file mode from address
if s := strings.Split(address, ","); len(s) == 2 {
fMode, err := strconv.ParseUint(s[1], 8, 32)
@@ -88,18 +94,8 @@ func (dl *DefaultListener) Listen(ctx context.Context, addr net.Addr, sockopt *S
return nil, newError("failed to parse file mode").Base(err)
}
address = s[0]
// set file mode for unix domain socket when it is created
defer func(name string, mode os.FileMode) {
if err != nil {
return
}
if cerr := os.Chmod(name, mode); cerr != nil {
// failed to set file mode, close the listener
l.Close()
l = nil
err = newError("failed to set file mode for file: ", name).Base(cerr)
}
}(address, os.FileMode(fMode))
fm := os.FileMode(fMode)
fileMode = &fm
}
// normal unix domain socket needs lock
locker := &FileLocker{
@@ -108,20 +104,29 @@ func (dl *DefaultListener) Listen(ctx context.Context, addr net.Addr, sockopt *S
if err := locker.Acquire(); err != nil {
return nil, err
}
defer func(locker *FileLocker) {
// combine listener and locker
if err == nil {
l = &combinedListener{Listener: l, locker: locker}
} else {
// failed to create listener, release the locker
// set file mode for unix domain socket when it is created
callback = func(l net.Listener, err error) (net.Listener, error) {
if err != nil {
locker.Release()
return nil, err
}
}(locker)
l = &combinedListener{Listener: l, locker: locker}
if fileMode == nil {
return l, err
}
if cerr := os.Chmod(address, *fileMode); cerr != nil {
// failed to set file mode, close the listener
l.Close()
return nil, newError("failed to set file mode for file: ", address).Base(cerr)
}
return l, err
}
}
}
l, err = lc.Listen(ctx, network, address)
if sockopt != nil && sockopt.AcceptProxyProtocol {
l, err := lc.Listen(ctx, network, address)
l, err = callback(l, err)
if err == nil && sockopt != nil && sockopt.AcceptProxyProtocol {
policyFunc := func(upstream net.Addr) (proxyproto.Policy, error) { return proxyproto.REQUIRE, nil }
l = &proxyproto.Listener{Listener: l, Policy: policyFunc}
}