mirror of https://github.com/hashicorp/consul
113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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//go:build windows && !fips
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// +build windows,!fips
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package envoy
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import (
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"errors"
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"fmt"
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"github.com/natefinch/npipe"
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"os"
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"os/exec"
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"path/filepath"
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"time"
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)
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func makeBootstrapPipe(bootstrapJSON []byte) (string, error) {
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pipeFile := filepath.Join(os.TempDir(),
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fmt.Sprintf("envoy-%x-bootstrap.json", time.Now().UnixNano()+int64(os.Getpid())))
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binary, args, err := execArgs("connect", "envoy", "pipe-bootstrap", pipeFile)
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if err != nil {
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return pipeFile, err
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}
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// Dial the named pipe
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pipeConn, err := npipe.Dial(pipeFile)
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if err != nil {
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return pipeFile, err
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}
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defer pipeConn.Close()
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// Start the command to connect to the named pipe
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cmd := exec.Command(binary, args...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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cmd.Stdin = pipeConn
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// Start the command
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err = cmd.Start()
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if err != nil {
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return pipeFile, err
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}
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// Write the config
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n, err := pipeConn.Write(bootstrapJSON)
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if err != nil {
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return pipeFile, err
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}
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if n < len(bootstrapJSON) {
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return pipeFile, fmt.Errorf("failed writing boostrap to child STDIN: %s", err)
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}
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// We can't wait for the process since we need to exec into Envoy before it
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// will be able to complete so it will be remain as a zombie until Envoy is
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// killed then will be reaped by the init process (pid 0). This is all a bit
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// gross but the cleanest workaround I can think of for Envoy 1.10 not
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// supporting /dev/fd/<fd> config paths any more. So we are done and leaving
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// the child to run it's course without reaping it.
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return pipeFile, nil
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}
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func startProc(binary string, args []string) (p *os.Process, err error) {
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if binary, err = exec.LookPath(binary); err == nil {
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var procAttr os.ProcAttr
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procAttr.Files = []*os.File{os.Stdin,
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os.Stdout, os.Stderr}
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p, err := os.StartProcess(binary, args, &procAttr)
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if err == nil {
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return p, nil
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}
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}
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return nil, err
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}
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func execEnvoy(binary string, prefixArgs, suffixArgs []string, bootstrapJSON []byte) error {
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tempFile, err := makeBootstrapPipe(bootstrapJSON)
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if err != nil {
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os.RemoveAll(tempFile)
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return err
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}
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// We don't defer a cleanup since we are about to Exec into Envoy which means
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// defer will never fire. The child process cleans up for us in the happy
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// path.
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// We default to disabling hot restart because it makes it easier to run
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// multiple envoys locally for testing without them trying to share memory and
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// unix sockets and complain about being different IDs. But if user is
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// actually configuring hot-restart explicitly with the --restart-epoch option
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// then don't disable it!
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disableHotRestart := !hasHotRestartOption(prefixArgs, suffixArgs)
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// First argument needs to be the executable name.
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envoyArgs := []string{}
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envoyArgs = append(envoyArgs, prefixArgs...)
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if disableHotRestart {
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envoyArgs = append(envoyArgs, "--disable-hot-restart")
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}
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envoyArgs = append(envoyArgs, suffixArgs...)
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envoyArgs = append(envoyArgs, "--config-path", tempFile)
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// Exec
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if proc, err := startProc(binary, envoyArgs); err == nil {
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proc.Wait()
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} else if err != nil {
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return errors.New("Failed to exec envoy: " + err.Error())
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}
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return nil
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}
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