mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-27 05:02:02 -08:00
282 lines
8.0 KiB
Go
282 lines
8.0 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package gocommand is a helper for calling the go command.
|
|
package gocommand
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
exec "golang.org/x/sys/execabs"
|
|
|
|
"golang.org/x/tools/internal/event"
|
|
)
|
|
|
|
// An Runner will run go command invocations and serialize
|
|
// them if it sees a concurrency error.
|
|
type Runner struct {
|
|
// once guards the runner initialization.
|
|
once sync.Once
|
|
|
|
// inFlight tracks available workers.
|
|
inFlight chan struct{}
|
|
|
|
// serialized guards the ability to run a go command serially,
|
|
// to avoid deadlocks when claiming workers.
|
|
serialized chan struct{}
|
|
}
|
|
|
|
const maxInFlight = 10
|
|
|
|
func (runner *Runner) initialize() {
|
|
runner.once.Do(func() {
|
|
runner.inFlight = make(chan struct{}, maxInFlight)
|
|
runner.serialized = make(chan struct{}, 1)
|
|
})
|
|
}
|
|
|
|
// 1.13: go: updates to go.mod needed, but contents have changed
|
|
// 1.14: go: updating go.mod: existing contents have changed since last read
|
|
var modConcurrencyError = regexp.MustCompile(`go:.*go.mod.*contents have changed`)
|
|
|
|
// Run is a convenience wrapper around RunRaw.
|
|
// It returns only stdout and a "friendly" error.
|
|
func (runner *Runner) Run(ctx context.Context, inv Invocation) (*bytes.Buffer, error) {
|
|
stdout, _, friendly, _ := runner.RunRaw(ctx, inv)
|
|
return stdout, friendly
|
|
}
|
|
|
|
// RunPiped runs the invocation serially, always waiting for any concurrent
|
|
// invocations to complete first.
|
|
func (runner *Runner) RunPiped(ctx context.Context, inv Invocation, stdout, stderr io.Writer) error {
|
|
_, err := runner.runPiped(ctx, inv, stdout, stderr)
|
|
return err
|
|
}
|
|
|
|
// RunRaw runs the invocation, serializing requests only if they fight over
|
|
// go.mod changes.
|
|
func (runner *Runner) RunRaw(ctx context.Context, inv Invocation) (*bytes.Buffer, *bytes.Buffer, error, error) {
|
|
// Make sure the runner is always initialized.
|
|
runner.initialize()
|
|
|
|
// First, try to run the go command concurrently.
|
|
stdout, stderr, friendlyErr, err := runner.runConcurrent(ctx, inv)
|
|
|
|
// If we encounter a load concurrency error, we need to retry serially.
|
|
if friendlyErr == nil || !modConcurrencyError.MatchString(friendlyErr.Error()) {
|
|
return stdout, stderr, friendlyErr, err
|
|
}
|
|
event.Error(ctx, "Load concurrency error, will retry serially", err)
|
|
|
|
// Run serially by calling runPiped.
|
|
stdout.Reset()
|
|
stderr.Reset()
|
|
friendlyErr, err = runner.runPiped(ctx, inv, stdout, stderr)
|
|
return stdout, stderr, friendlyErr, err
|
|
}
|
|
|
|
func (runner *Runner) runConcurrent(ctx context.Context, inv Invocation) (*bytes.Buffer, *bytes.Buffer, error, error) {
|
|
// Wait for 1 worker to become available.
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, nil, nil, ctx.Err()
|
|
case runner.inFlight <- struct{}{}:
|
|
defer func() { <-runner.inFlight }()
|
|
}
|
|
|
|
stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{}
|
|
friendlyErr, err := inv.runWithFriendlyError(ctx, stdout, stderr)
|
|
return stdout, stderr, friendlyErr, err
|
|
}
|
|
|
|
func (runner *Runner) runPiped(ctx context.Context, inv Invocation, stdout, stderr io.Writer) (error, error) {
|
|
// Make sure the runner is always initialized.
|
|
runner.initialize()
|
|
|
|
// Acquire the serialization lock. This avoids deadlocks between two
|
|
// runPiped commands.
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
case runner.serialized <- struct{}{}:
|
|
defer func() { <-runner.serialized }()
|
|
}
|
|
|
|
// Wait for all in-progress go commands to return before proceeding,
|
|
// to avoid load concurrency errors.
|
|
for i := 0; i < maxInFlight; i++ {
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
case runner.inFlight <- struct{}{}:
|
|
// Make sure we always "return" any workers we took.
|
|
defer func() { <-runner.inFlight }()
|
|
}
|
|
}
|
|
|
|
return inv.runWithFriendlyError(ctx, stdout, stderr)
|
|
}
|
|
|
|
// An Invocation represents a call to the go command.
|
|
type Invocation struct {
|
|
Verb string
|
|
Args []string
|
|
BuildFlags []string
|
|
|
|
// If ModFlag is set, the go command is invoked with -mod=ModFlag.
|
|
ModFlag string
|
|
|
|
// If ModFile is set, the go command is invoked with -modfile=ModFile.
|
|
ModFile string
|
|
|
|
// If Overlay is set, the go command is invoked with -overlay=Overlay.
|
|
Overlay string
|
|
|
|
// If CleanEnv is set, the invocation will run only with the environment
|
|
// in Env, not starting with os.Environ.
|
|
CleanEnv bool
|
|
Env []string
|
|
WorkingDir string
|
|
Logf func(format string, args ...interface{})
|
|
}
|
|
|
|
func (i *Invocation) runWithFriendlyError(ctx context.Context, stdout, stderr io.Writer) (friendlyError error, rawError error) {
|
|
rawError = i.run(ctx, stdout, stderr)
|
|
if rawError != nil {
|
|
friendlyError = rawError
|
|
// Check for 'go' executable not being found.
|
|
if ee, ok := rawError.(*exec.Error); ok && ee.Err == exec.ErrNotFound {
|
|
friendlyError = fmt.Errorf("go command required, not found: %v", ee)
|
|
}
|
|
if ctx.Err() != nil {
|
|
friendlyError = ctx.Err()
|
|
}
|
|
friendlyError = fmt.Errorf("err: %v: stderr: %s", friendlyError, stderr)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (i *Invocation) run(ctx context.Context, stdout, stderr io.Writer) error {
|
|
log := i.Logf
|
|
if log == nil {
|
|
log = func(string, ...interface{}) {}
|
|
}
|
|
|
|
goArgs := []string{i.Verb}
|
|
|
|
appendModFile := func() {
|
|
if i.ModFile != "" {
|
|
goArgs = append(goArgs, "-modfile="+i.ModFile)
|
|
}
|
|
}
|
|
appendModFlag := func() {
|
|
if i.ModFlag != "" {
|
|
goArgs = append(goArgs, "-mod="+i.ModFlag)
|
|
}
|
|
}
|
|
appendOverlayFlag := func() {
|
|
if i.Overlay != "" {
|
|
goArgs = append(goArgs, "-overlay="+i.Overlay)
|
|
}
|
|
}
|
|
|
|
switch i.Verb {
|
|
case "env", "version":
|
|
goArgs = append(goArgs, i.Args...)
|
|
case "mod":
|
|
// mod needs the sub-verb before flags.
|
|
goArgs = append(goArgs, i.Args[0])
|
|
appendModFile()
|
|
goArgs = append(goArgs, i.Args[1:]...)
|
|
case "get":
|
|
goArgs = append(goArgs, i.BuildFlags...)
|
|
appendModFile()
|
|
goArgs = append(goArgs, i.Args...)
|
|
|
|
default: // notably list and build.
|
|
goArgs = append(goArgs, i.BuildFlags...)
|
|
appendModFile()
|
|
appendModFlag()
|
|
appendOverlayFlag()
|
|
goArgs = append(goArgs, i.Args...)
|
|
}
|
|
cmd := exec.Command("go", goArgs...)
|
|
cmd.Stdout = stdout
|
|
cmd.Stderr = stderr
|
|
// On darwin the cwd gets resolved to the real path, which breaks anything that
|
|
// expects the working directory to keep the original path, including the
|
|
// go command when dealing with modules.
|
|
// The Go stdlib has a special feature where if the cwd and the PWD are the
|
|
// same node then it trusts the PWD, so by setting it in the env for the child
|
|
// process we fix up all the paths returned by the go command.
|
|
if !i.CleanEnv {
|
|
cmd.Env = os.Environ()
|
|
}
|
|
cmd.Env = append(cmd.Env, i.Env...)
|
|
if i.WorkingDir != "" {
|
|
cmd.Env = append(cmd.Env, "PWD="+i.WorkingDir)
|
|
cmd.Dir = i.WorkingDir
|
|
}
|
|
defer func(start time.Time) { log("%s for %v", time.Since(start), cmdDebugStr(cmd)) }(time.Now())
|
|
|
|
return runCmdContext(ctx, cmd)
|
|
}
|
|
|
|
// runCmdContext is like exec.CommandContext except it sends os.Interrupt
|
|
// before os.Kill.
|
|
func runCmdContext(ctx context.Context, cmd *exec.Cmd) error {
|
|
if err := cmd.Start(); err != nil {
|
|
return err
|
|
}
|
|
resChan := make(chan error, 1)
|
|
go func() {
|
|
resChan <- cmd.Wait()
|
|
}()
|
|
|
|
select {
|
|
case err := <-resChan:
|
|
return err
|
|
case <-ctx.Done():
|
|
}
|
|
// Cancelled. Interrupt and see if it ends voluntarily.
|
|
cmd.Process.Signal(os.Interrupt)
|
|
select {
|
|
case err := <-resChan:
|
|
return err
|
|
case <-time.After(time.Second):
|
|
}
|
|
// Didn't shut down in response to interrupt. Kill it hard.
|
|
cmd.Process.Kill()
|
|
return <-resChan
|
|
}
|
|
|
|
func cmdDebugStr(cmd *exec.Cmd) string {
|
|
env := make(map[string]string)
|
|
for _, kv := range cmd.Env {
|
|
split := strings.SplitN(kv, "=", 2)
|
|
k, v := split[0], split[1]
|
|
env[k] = v
|
|
}
|
|
|
|
var args []string
|
|
for _, arg := range cmd.Args {
|
|
quoted := strconv.Quote(arg)
|
|
if quoted[1:len(quoted)-1] != arg || strings.Contains(arg, " ") {
|
|
args = append(args, quoted)
|
|
} else {
|
|
args = append(args, arg)
|
|
}
|
|
}
|
|
return fmt.Sprintf("GOROOT=%v GOPATH=%v GO111MODULE=%v GOPROXY=%v PWD=%v %v", env["GOROOT"], env["GOPATH"], env["GO111MODULE"], env["GOPROXY"], env["PWD"], strings.Join(args, " "))
|
|
}
|