feat: gitea client

vendor/cloud.google.com/go/auth/grpctransport/dial_socketopt.go

@@ -0,0 +1,62 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build linux
+// +build linux
+
+package grpctransport
+
+import (
+	"context"
+	"net"
+	"syscall"
+
+	"google.golang.org/grpc"
+)
+
+const (
+	// defaultTCPUserTimeout is the default TCP_USER_TIMEOUT socket option. By
+	// default is 20 seconds.
+	tcpUserTimeoutMilliseconds = 20000
+
+	// Copied from golang.org/x/sys/unix.TCP_USER_TIMEOUT.
+	tcpUserTimeoutOp = 0x12
+)
+
+func init() {
+	// timeoutDialerOption is a grpc.DialOption that contains dialer with
+	// socket option TCP_USER_TIMEOUT. This dialer requires go versions 1.11+.
+	timeoutDialerOption = grpc.WithContextDialer(dialTCPUserTimeout)
+}
+
+func dialTCPUserTimeout(ctx context.Context, addr string) (net.Conn, error) {
+	control := func(network, address string, c syscall.RawConn) error {
+		var syscallErr error
+		controlErr := c.Control(func(fd uintptr) {
+			syscallErr = syscall.SetsockoptInt(
+				int(fd), syscall.IPPROTO_TCP, tcpUserTimeoutOp, tcpUserTimeoutMilliseconds)
+		})
+		if syscallErr != nil {
+			return syscallErr
+		}
+		if controlErr != nil {
+			return controlErr
+		}
+		return nil
+	}
+	d := &net.Dialer{
+		Control: control,
+	}
+	return d.DialContext(ctx, "tcp", addr)
+}