library: io: implement Windows platform support

Discord on Windows makes use of Windows named pipes for the socket instead of UNIX domain sockets.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

go.mod

@@ -4,7 +4,9 @@ go 1.22
 
 require (
 	fyne.io/fyne/v2 v2.4.5
+	github.com/Microsoft/go-winio v0.6.2
 	github.com/google/uuid v1.6.0
+	golang.org/x/image v0.17.0
 )
 
 require (
@@ -28,7 +30,6 @@ require (
 	github.com/stretchr/testify v1.8.4 // indirect
 	github.com/tevino/abool v1.2.0 // indirect
 	github.com/yuin/goldmark v1.5.5 // indirect
-	golang.org/x/image v0.17.0 // indirect
 	golang.org/x/mobile v0.0.0-20231127183840-76ac6878050a // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.21.0 // indirect

io_windows.go

@@ -0,0 +1,27 @@
+package rpcfetch
+
+import (
+	"errors"
+	"github.com/Microsoft/go-winio"
+	"io/fs"
+	"syscall"
+)
+
+var errPipe = syscall.Errno(232)
+
+func (d *Client) dial() error {
+	if d.dialed {
+		panic("attempted to dial on open client")
+	}
+
+	if conn, err := winio.DialPipe(`\\.\pipe\discord-ipc-0`, nil); err != nil {
+		if errors.Is(err, winio.ErrTimeout) || errors.Is(err, fs.ErrNotExist) {
+			return ErrAgain
+		}
+		return err
+	} else {
+		d.conn = conn
+		d.dialed = true
+	}
+	return nil
+}