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