refactor: supports Windows with address listen by named pipe

README.md

@@ -155,6 +155,28 @@ func main() {
 * Currently shells out to `mv` for moving files because `mv` handles cross-partition moves unlike `os.Rename`.
 * Package `init()` functions will run twice on start, once in the main process and once in the child process.
 
+## Windows Named Pipe Communication
+
+On Windows platform, since UNIX domain sockets and file descriptor passing mechanisms are not supported, Overseer uses Windows named pipes to implement communication between the main process and child processes.
+
+### Architecture Design
+
+1. **Main Process**:
+   - Creates a unique named pipe for each listening address
+   - Passes all pipe names as environment variables to the child process
+   - Accepts pipe connections from the child process, and creates dedicated data transfer channels for each address
+
+2. **Child Process**:
+   - Gets all pipe names and counts from environment variables
+   - Connects to corresponding dedicated pipes for each address
+   - Creates virtual listeners for each address, handling connections transparently
+
+3. **Connection Flow**:
+   - Client connects to the main process's TCP listener
+   - Main process directly forwards TCP connections to the dedicated pipe for the corresponding address
+   - Child process receives data from the pipe and processes the request
+   - No control information exchange is needed, data transmission is direct
+
 ### More documentation
 
 * [Core `overseer` package](https://godoc.org/github.com/jpillora/overseer)

example/go.mod

@@ -1,6 +1,8 @@
 module eg
 
-go 1.13
+go 1.21
+
+toolchain go1.23.2
 
 replace github.com/jpillora/overseer => ../
 

example/go.sum

@@ -1,21 +1,72 @@
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
+github.com/StackExchange/wmi v1.2.1/go.mod h1:rcmrprowKIVzvc+NUiLncP2uuArMWLCbu9SBzvHz7e8=
 github.com/aws/aws-sdk-go v1.29.34 h1:yrzwfDaZFe9oT4AmQeNNunSQA7c0m2chz0B43+bJ1ok=
 github.com/aws/aws-sdk-go v1.29.34/go.mod h1:1KvfttTE3SPKMpo8g2c6jL3ZKfXtFvKscTgahTma5Xg=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-ole/go-ole v1.2.4/go.mod h1:XCwSNxSkXRo4vlyPy93sltvi/qJq0jqQhjqQNIwKuxM=
+github.com/go-ole/go-ole v1.2.5/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5imkbgOkpRUYLnmbU7UEFbjtDA2hxJ1ichM=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
+github.com/jpillora/s3 v1.1.4/go.mod h1:yedE603V+crlFi1Kl/5vZJaBu9pUzE9wvKegU/lF2zs=
 github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 h1:iQTw/8FWTuc7uiaSepXwyf3o52HaUYcV+Tu66S3F5GA=
 github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0/go.mod h1:1NbS8ALrpOvjt0rHPNLyCIeMtbizbir8U//inJ+zuB8=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
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 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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+golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
+golang.org/x/term v0.10.0/go.mod h1:lpqdcUyK/oCiQxvxVrppt5ggO2KCZ5QblwqPnfZ6d5o=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.11.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/tools v0.11.0/go.mod h1:anzJrxPjNtfgiYQYirP2CPGzGLxrH2u2QBhn6Bf3qY8=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

go.mod

@@ -1,9 +1,16 @@
 module github.com/jpillora/overseer
 
-go 1.13
+go 1.23.0
+
+toolchain go1.23.2
 
 require (
-	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d
-	github.com/go-ole/go-ole v1.2.4 // indirect
+	github.com/Microsoft/go-winio v0.6.2
 	github.com/jpillora/s3 v1.1.4
+	github.com/yusufpapurcu/wmi v1.2.4
+)
+
+require (
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	golang.org/x/sys v0.10.0 // indirect
 )

go.sum

@@ -1,10 +1,15 @@
-github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d h1:G0m3OIz70MZUWq3EgK3CesDbo8upS2Vm9/P3FtgI+Jk=
-github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
-github.com/go-ole/go-ole v1.2.4 h1:nNBDSCOigTSiarFpYE9J/KtEA1IOW4CNeqT9TQDqCxI=
-github.com/go-ole/go-ole v1.2.4/go.mod h1:XCwSNxSkXRo4vlyPy93sltvi/qJq0jqQhjqQNIwKuxM=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
+github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/jpillora/s3 v1.1.4 h1:YCCKDWzb/Ye9EBNd83ATRF/8wPEy0xd43Rezb6u6fzc=
 github.com/jpillora/s3 v1.1.4/go.mod h1:yedE603V+crlFi1Kl/5vZJaBu9pUzE9wvKegU/lF2zs=
 github.com/smartystreets/assertions v1.0.1 h1:voD4ITNjPL5jjBfgR/r8fPIIBrliWrWHeiJApdr3r4w=
 github.com/smartystreets/assertions v1.0.1/go.mod h1:kHHU4qYBaI3q23Pp3VPrmWhuIUrLW/7eUrw0BU5VaoM=
 github.com/smartystreets/gunit v1.1.3 h1:32x+htJCu3aMswhPw3teoJ+PnWPONqdNgaGs6Qt8ZaU=
 github.com/smartystreets/gunit v1.1.3/go.mod h1:EH5qMBab2UclzXUcpR8b93eHsIlp9u+pDQIRp5DZNzQ=
+github.com/yusufpapurcu/wmi v1.2.4 h1:zFUKzehAFReQwLys1b/iSMl+JQGSCSjtVqQn9bBrPo0=
+github.com/yusufpapurcu/wmi v1.2.4/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQmPyzfmi0=
+golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
+golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

graceful.go

@@ -1,8 +1,7 @@
 package overseer
 
-//overseer listeners and connections allow graceful
-//restarts by tracking when all connections from a listener
-//have been closed
+// overseer listeners and connections allow graceful restarts by tracking when all connections
+// from a listener have been closed
 
 import (
 	"net"
@@ -18,7 +17,7 @@ func newOverseerListener(l net.Listener) *overseerListener {
 	}
 }
 
-//gracefully closing net.Listener
+// gracefully closing net.Listener
 type overseerListener struct {
 	net.Listener
 	closeError   error
@@ -27,12 +26,26 @@ type overseerListener struct {
 }
 
 func (l *overseerListener) Accept() (net.Conn, error) {
-	conn, err := l.Listener.(*net.TCPListener).AcceptTCP()
-	if err != nil {
-		return nil, err
+	var conn net.Conn
+
+	// Try to convert the listener to TCPListener for better connection control
+	if tcpL, ok := l.Listener.(*net.TCPListener); ok {
+		tcpConn, tcpErr := tcpL.AcceptTCP()
+		if tcpErr != nil {
+			return nil, tcpErr
+		}
+		tcpConn.SetKeepAlive(true)                  // see http.tcpKeepAliveListener
+		tcpConn.SetKeepAlivePeriod(3 * time.Minute) // see http.tcpKeepAliveListener
+		conn = tcpConn
+	} else {
+		// For non-TCP listeners, use standard Accept
+		standardConn, standardErr := l.Listener.Accept()
+		if standardErr != nil {
+			return nil, standardErr
+		}
+		conn = standardConn
 	}
-	conn.SetKeepAlive(true)                  // see http.tcpKeepAliveListener
-	conn.SetKeepAlivePeriod(3 * time.Minute) // see http.tcpKeepAliveListener
+
 	uconn := overseerConn{
 		Conn:   conn,
 		wg:     &l.wg,
@@ -44,18 +57,18 @@ func (l *overseerListener) Accept() (net.Conn, error) {
 		case <-l.closeByForce:
 			uconn.Close()
 		case <-uconn.closed:
-			//closed manually
+			// closed manually
 		}
 	}()
 	l.wg.Add(1)
 	return uconn, nil
 }
 
-//non-blocking trigger close
+// non-blocking trigger close
 func (l *overseerListener) release(timeout time.Duration) {
-	//stop accepting connections - release fd
+	// stop accepting connections - release fd
 	l.closeError = l.Listener.Close()
-	//start timer, close by force if deadline not met
+	// start timer, close by force if deadline not met
 	waited := make(chan bool)
 	go func() {
 		l.wg.Wait()
@@ -71,20 +84,25 @@ func (l *overseerListener) release(timeout time.Duration) {
 	}()
 }
 
-//blocking wait for close
+// Close after blocking wait
 func (l *overseerListener) Close() error {
 	l.wg.Wait()
 	return l.closeError
 }
 
 func (l *overseerListener) File() *os.File {
 	// returns a dup(2) - FD_CLOEXEC flag *not* set
-	tl := l.Listener.(*net.TCPListener)
-	fl, _ := tl.File()
-	return fl
+	if tcpL, ok := l.Listener.(*net.TCPListener); ok {
+		fl, _ := tcpL.File()
+		return fl
+	}
+
+	// For non-TCP listeners, return nil
+	// This is safe because Windows version doesn't use ExtraFiles feature
+	return nil
 }
 
-//notifying on close net.Conn
+// notifying on close net.Conn
 type overseerConn struct {
 	net.Conn
 	wg     *sync.WaitGroup