Migrate go code to function in go 1.22+

Author: consideRatio

.github/workflows/build-publish-python-packages.yaml

@@ -68,7 +68,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: "1.21"
+          go-version: "1.23"
           cache-dependency-path: "**/*.sum"
       - uses: actions/setup-python@v5
         with:

.github/workflows/test.yaml

@@ -58,13 +58,13 @@ jobs:
           #   that would be fine.
           #
           - python-version: "3.10"
-            go-version: "1.20"
+            go-version: "1.22"
           - python-version: "3.11"
-            go-version: "1.20"
+            go-version: "1.22"
           - python-version: "3.12"
-            go-version: "1.21"
+            go-version: "1.23"
           - python-version: "3.13"
-            go-version: "1.21"
+            go-version: "1.23"
 
     steps:
       - uses: actions/checkout@v4

dask-gateway-server/dask-gateway-proxy/go.mod

@@ -1,8 +1,8 @@
 module github.com/dask/dask-gateway/dask-gateway-proxy
 
-go 1.21
+go 1.22
 
-require github.com/stretchr/testify v1.8.4
+require github.com/stretchr/testify v1.10.0
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect

dask-gateway-server/dask-gateway-proxy/pkg/sni/sni.go

@@ -8,6 +8,18 @@ import (
 	"net"
 )
 
+// hideWriteTo is a workaround introduced to make the code functional in 1.22+,
+// where io.Copy would no longer make use of peekedTCPConn.Read after
+// net.TCPConn.WriteTo was added, so the workaround is to hide it again.
+//
+// The workaround was developed inspecting:
+// https://github.com/golang/go/commit/f664031bc17629080332a1c7bede38d67fd32e47
+//
+type hideWriteTo struct{}
+func (hideWriteTo) WriteTo(io.Writer) (int64, error) {
+       panic("can't happen")
+}
+
 type TcpConn interface {
 	net.Conn
 	CloseWrite() error
@@ -16,6 +28,7 @@ type TcpConn interface {
 
 type peekedTCPConn struct {
 	peeked []byte
+	hideWriteTo
 	*net.TCPConn
 }