controller: remove controller grpc service

Remove the controller grpc service along with associated code related to
sessions or remote controllers.

Data types that are still used with complicated dependency chains have
been kept in the same package for a future refactor.

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

vendor/github.com/containerd/containerd/v2/pkg/dialer/dialer.go

@@ -1,74 +0,0 @@
-/*
-   Copyright The containerd Authors.
-
-   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.
-*/
-
-package dialer
-
-import (
-	"context"
-	"fmt"
-	"net"
-	"time"
-)
-
-type dialResult struct {
-	c   net.Conn
-	err error
-}
-
-// ContextDialer returns a GRPC net.Conn connected to the provided address
-func ContextDialer(ctx context.Context, address string) (net.Conn, error) {
-	if deadline, ok := ctx.Deadline(); ok {
-		return timeoutDialer(address, time.Until(deadline))
-	}
-	return timeoutDialer(address, 0)
-}
-
-func timeoutDialer(address string, timeout time.Duration) (net.Conn, error) {
-	var (
-		stopC = make(chan struct{})
-		synC  = make(chan *dialResult)
-	)
-	go func() {
-		defer close(synC)
-		for {
-			select {
-			case <-stopC:
-				return
-			default:
-				c, err := dialer(address, timeout)
-				if isNoent(err) {
-					<-time.After(10 * time.Millisecond)
-					continue
-				}
-				synC <- &dialResult{c, err}
-				return
-			}
-		}
-	}()
-	select {
-	case dr := <-synC:
-		return dr.c, dr.err
-	case <-time.After(timeout):
-		close(stopC)
-		go func() {
-			dr := <-synC
-			if dr != nil && dr.c != nil {
-				dr.c.Close()
-			}
-		}()
-		return nil, fmt.Errorf("dial %s: timeout", address)
-	}
-}

vendor/github.com/containerd/containerd/v2/pkg/dialer/dialer_unix.go

@@ -1,43 +0,0 @@
-//go:build !windows
-
-/*
-   Copyright The containerd Authors.
-
-   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.
-*/
-
-package dialer
-
-import (
-	"errors"
-	"fmt"
-	"net"
-	"strings"
-	"syscall"
-	"time"
-)
-
-// DialAddress returns the address with unix:// prepended to the
-// provided address
-func DialAddress(address string) string {
-	return fmt.Sprintf("unix://%s", address)
-}
-
-func isNoent(err error) bool {
-	return errors.Is(err, syscall.ENOENT)
-}
-
-func dialer(address string, timeout time.Duration) (net.Conn, error) {
-	address = strings.TrimPrefix(address, "unix://")
-	return net.DialTimeout("unix", address, timeout)
-}

vendor/github.com/containerd/containerd/v2/pkg/dialer/dialer_windows.go

@@ -1,47 +0,0 @@
-/*
-   Copyright The containerd Authors.
-
-   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.
-*/
-
-package dialer
-
-import (
-	"fmt"
-	"net"
-	"os"
-	"path/filepath"
-	"strings"
-	"time"
-
-	winio "github.com/Microsoft/go-winio"
-)
-
-func isNoent(err error) bool {
-	return os.IsNotExist(err)
-}
-
-func dialer(address string, timeout time.Duration) (net.Conn, error) {
-	address = strings.TrimPrefix(filepath.ToSlash(address), "npipe://")
-	return winio.DialPipe(address, &timeout)
-}
-
-// DialAddress returns the dial address with npipe:// prepended to the
-// provided address
-func DialAddress(address string) string {
-	address = filepath.ToSlash(address)
-	if !strings.HasPrefix(address, "npipe://") {
-		address = fmt.Sprintf("npipe://%s", address)
-	}
-	return address
-}