mirror of
https://github.com/containerd/containerd.git
synced 2026-11-06 13:27:16 +00:00
116 lines
3.8 KiB
Go
116 lines
3.8 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package shim
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import (
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"context"
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"fmt"
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"net"
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"os"
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"time"
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winio "github.com/Microsoft/go-winio"
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)
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const shimBinaryFormat = "containerd-shim-%s-%s.exe"
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// AnonReconnectDialer connects to a named pipe that should already exist.
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// It fails immediately if the pipe is not found, rather than retrying.
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//
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// Use this when reconnecting to a shim that is expected to be running
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// (e.g. after a containerd restart). If the pipe doesn't exist, the shim
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// is dead and there's no point waiting.
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//
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// This fail-fast behavior is critical on Windows: the Service Control Manager
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// enforces a ~30s startup deadline on containerd. If reconnecting to many dead
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// shims, a 5s retry per shim (as in AnonDialer) could exceed that budget and
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// cause the SCM to kill containerd. See #3659.
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//
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// On Unix, this function simply calls AnonDialer since Unix domain sockets
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// appear atomically and the distinction is unnecessary.
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func AnonReconnectDialer(address string, timeout time.Duration) (net.Conn, error) {
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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c, err := winio.DialPipeContext(ctx, address)
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if os.IsNotExist(err) {
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return nil, fmt.Errorf("npipe not found on reconnect: %w", os.ErrNotExist)
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} else if err == context.DeadlineExceeded {
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return nil, fmt.Errorf("timed out waiting for npipe %s: %w", address, err)
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} else if err != nil {
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return nil, err
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}
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return c, nil
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}
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// AnonDialer connects to a named pipe, retrying for up to 5 seconds if the
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// pipe does not yet exist.
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//
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// Use this when connecting to a newly started shim. The shim's "start" helper
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// returns the pipe address before the long-lived shim daemon has created the
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// pipe, so a brief retry window is expected. 5 seconds is generous enough for
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// any healthy shim to begin serving.
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//
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// Unlike Unix domain sockets (which appear atomically on Listen), Windows named
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// pipes may take measurable time to appear — especially under load on CI
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// runners. See #2519, #2692.
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func AnonDialer(address string, timeout time.Duration) (net.Conn, error) {
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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// If there is nobody serving the pipe we limit the timeout for this case to
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// 5 seconds because any shim that would serve this endpoint should serve it
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// within 5 seconds.
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serveTimer := time.NewTimer(5 * time.Second)
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defer serveTimer.Stop()
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for {
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c, err := winio.DialPipeContext(ctx, address)
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if err != nil {
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if os.IsNotExist(err) {
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select {
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case <-serveTimer.C:
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return nil, fmt.Errorf("pipe not found before timeout: %w", os.ErrNotExist)
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default:
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// Wait 10ms for the shim to serve and try again.
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time.Sleep(10 * time.Millisecond)
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continue
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}
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} else if err == context.DeadlineExceeded {
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return nil, fmt.Errorf("timed out waiting for npipe %s: %w", address, err)
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}
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return nil, err
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}
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return c, nil
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}
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}
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// RemoveSocket removes the socket at the specified address if
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// it exists on the filesystem
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func RemoveSocket(address string) error {
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return nil
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}
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func writeSocketDir(string) error {
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return nil
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}
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func cleanupSockets(context.Context) {
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if address, err := ReadAddress("address"); err == nil {
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_ = RemoveSocket(address)
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}
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}
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