mirror of
https://github.com/go-gitea/gitea
synced 2024-12-21 12:14:10 +01:00
294 lines
8.4 KiB
Go
294 lines
8.4 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
|
|
// Copyright 2019 The Gitea Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package process
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"os/exec"
|
|
"sort"
|
|
"strconv"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// TODO: This packages still uses a singleton for the Manager.
|
|
// Once there's a decent web framework and dependencies are passed around like they should,
|
|
// then we delete the singleton.
|
|
|
|
var (
|
|
manager *Manager
|
|
managerInit sync.Once
|
|
|
|
// DefaultContext is the default context to run processing commands in
|
|
DefaultContext = context.Background()
|
|
)
|
|
|
|
// IDType is a pid type
|
|
type IDType string
|
|
|
|
// FinishedFunc is a function that marks that the process is finished and can be removed from the process table
|
|
// - it is simply an alias for context.CancelFunc and is only for documentary purposes
|
|
type FinishedFunc = context.CancelFunc
|
|
|
|
// Manager manages all processes and counts PIDs.
|
|
type Manager struct {
|
|
mutex sync.Mutex
|
|
|
|
next int64
|
|
lastTime int64
|
|
|
|
processes map[IDType]*Process
|
|
}
|
|
|
|
// GetManager returns a Manager and initializes one as singleton if there's none yet
|
|
func GetManager() *Manager {
|
|
managerInit.Do(func() {
|
|
manager = &Manager{
|
|
processes: make(map[IDType]*Process),
|
|
next: 1,
|
|
}
|
|
})
|
|
return manager
|
|
}
|
|
|
|
// AddContext creates a new context and adds it as a process. Once the process is finished, finished must be called
|
|
// to remove the process from the process table. It should not be called until the process is finished but must always be called.
|
|
//
|
|
// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
|
|
// finished will cancel the returned context and remove it from the process table.
|
|
//
|
|
// Most processes will not need to use the cancel function but there will be cases whereby you want to cancel the process but not immediately remove it from the
|
|
// process table.
|
|
func (pm *Manager) AddContext(parent context.Context, description string) (ctx context.Context, cancel context.CancelFunc, finished FinishedFunc) {
|
|
parentPID := GetParentPID(parent)
|
|
|
|
ctx, cancel = context.WithCancel(parent)
|
|
|
|
pid, finished := pm.Add(parentPID, description, cancel)
|
|
|
|
return &Context{
|
|
Context: ctx,
|
|
pid: pid,
|
|
}, cancel, finished
|
|
}
|
|
|
|
// AddContextTimeout creates a new context and add it as a process. Once the process is finished, finished must be called
|
|
// to remove the process from the process table. It should not be called until the process is finished but must always be called.
|
|
//
|
|
// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
|
|
// finished will cancel the returned context and remove it from the process table.
|
|
//
|
|
// Most processes will not need to use the cancel function but there will be cases whereby you want to cancel the process but not immediately remove it from the
|
|
// process table.
|
|
func (pm *Manager) AddContextTimeout(parent context.Context, timeout time.Duration, description string) (ctx context.Context, cancel context.CancelFunc, finshed FinishedFunc) {
|
|
parentPID := GetParentPID(parent)
|
|
|
|
ctx, cancel = context.WithTimeout(parent, timeout)
|
|
|
|
pid, finshed := pm.Add(parentPID, description, cancel)
|
|
|
|
return &Context{
|
|
Context: ctx,
|
|
pid: pid,
|
|
}, cancel, finshed
|
|
}
|
|
|
|
// Add create a new process
|
|
func (pm *Manager) Add(parentPID IDType, description string, cancel context.CancelFunc) (IDType, FinishedFunc) {
|
|
pm.mutex.Lock()
|
|
start, pid := pm.nextPID()
|
|
|
|
parent := pm.processes[parentPID]
|
|
if parent == nil {
|
|
parentPID = ""
|
|
}
|
|
|
|
process := &Process{
|
|
PID: pid,
|
|
ParentPID: parentPID,
|
|
Description: description,
|
|
Start: start,
|
|
Cancel: cancel,
|
|
}
|
|
|
|
finished := func() {
|
|
cancel()
|
|
pm.remove(process)
|
|
}
|
|
|
|
if parent != nil {
|
|
parent.AddChild(process)
|
|
}
|
|
pm.processes[pid] = process
|
|
pm.mutex.Unlock()
|
|
|
|
return pid, finished
|
|
}
|
|
|
|
// nextPID will return the next available PID. pm.mutex should already be locked.
|
|
func (pm *Manager) nextPID() (start time.Time, pid IDType) {
|
|
start = time.Now()
|
|
startUnix := start.Unix()
|
|
if pm.lastTime == startUnix {
|
|
pm.next++
|
|
} else {
|
|
pm.next = 1
|
|
}
|
|
pm.lastTime = startUnix
|
|
pid = IDType(strconv.FormatInt(start.Unix(), 16))
|
|
|
|
if pm.next == 1 {
|
|
return
|
|
}
|
|
pid = IDType(string(pid) + "-" + strconv.FormatInt(pm.next, 10))
|
|
return
|
|
}
|
|
|
|
// Remove a process from the ProcessManager.
|
|
func (pm *Manager) Remove(pid IDType) {
|
|
pm.mutex.Lock()
|
|
delete(pm.processes, pid)
|
|
pm.mutex.Unlock()
|
|
}
|
|
|
|
func (pm *Manager) remove(process *Process) {
|
|
pm.mutex.Lock()
|
|
if p := pm.processes[process.PID]; p == process {
|
|
delete(pm.processes, process.PID)
|
|
}
|
|
parent := pm.processes[process.ParentPID]
|
|
pm.mutex.Unlock()
|
|
|
|
if parent == nil {
|
|
return
|
|
}
|
|
|
|
parent.RemoveChild(process)
|
|
}
|
|
|
|
// Cancel a process in the ProcessManager.
|
|
func (pm *Manager) Cancel(pid IDType) {
|
|
pm.mutex.Lock()
|
|
process, ok := pm.processes[pid]
|
|
pm.mutex.Unlock()
|
|
if ok {
|
|
process.Cancel()
|
|
}
|
|
}
|
|
|
|
// Processes gets the processes in a thread safe manner
|
|
func (pm *Manager) Processes(onlyRoots bool) []*Process {
|
|
pm.mutex.Lock()
|
|
processes := make([]*Process, 0, len(pm.processes))
|
|
if onlyRoots {
|
|
for _, process := range pm.processes {
|
|
if _, has := pm.processes[process.ParentPID]; !has {
|
|
processes = append(processes, process)
|
|
}
|
|
}
|
|
} else {
|
|
for _, process := range pm.processes {
|
|
processes = append(processes, process)
|
|
}
|
|
}
|
|
pm.mutex.Unlock()
|
|
|
|
sort.Slice(processes, func(i, j int) bool {
|
|
left, right := processes[i], processes[j]
|
|
|
|
return left.Start.Before(right.Start)
|
|
})
|
|
|
|
return processes
|
|
}
|
|
|
|
// Exec a command and use the default timeout.
|
|
func (pm *Manager) Exec(desc, cmdName string, args ...string) (string, string, error) {
|
|
return pm.ExecDir(DefaultContext, -1, "", desc, cmdName, args...)
|
|
}
|
|
|
|
// ExecTimeout a command and use a specific timeout duration.
|
|
func (pm *Manager) ExecTimeout(timeout time.Duration, desc, cmdName string, args ...string) (string, string, error) {
|
|
return pm.ExecDir(DefaultContext, timeout, "", desc, cmdName, args...)
|
|
}
|
|
|
|
// ExecDir a command and use the default timeout.
|
|
func (pm *Manager) ExecDir(ctx context.Context, timeout time.Duration, dir, desc, cmdName string, args ...string) (string, string, error) {
|
|
return pm.ExecDirEnv(ctx, timeout, dir, desc, nil, cmdName, args...)
|
|
}
|
|
|
|
// ExecDirEnv runs a command in given path and environment variables, and waits for its completion
|
|
// up to the given timeout (or DefaultTimeout if -1 is given).
|
|
// Returns its complete stdout and stderr
|
|
// outputs and an error, if any (including timeout)
|
|
func (pm *Manager) ExecDirEnv(ctx context.Context, timeout time.Duration, dir, desc string, env []string, cmdName string, args ...string) (string, string, error) {
|
|
return pm.ExecDirEnvStdIn(ctx, timeout, dir, desc, env, nil, cmdName, args...)
|
|
}
|
|
|
|
// ExecDirEnvStdIn runs a command in given path and environment variables with provided stdIN, and waits for its completion
|
|
// up to the given timeout (or DefaultTimeout if -1 is given).
|
|
// Returns its complete stdout and stderr
|
|
// outputs and an error, if any (including timeout)
|
|
func (pm *Manager) ExecDirEnvStdIn(ctx context.Context, timeout time.Duration, dir, desc string, env []string, stdIn io.Reader, cmdName string, args ...string) (string, string, error) {
|
|
if timeout == -1 {
|
|
timeout = 60 * time.Second
|
|
}
|
|
|
|
stdOut := new(bytes.Buffer)
|
|
stdErr := new(bytes.Buffer)
|
|
|
|
ctx, _, finished := pm.AddContextTimeout(ctx, timeout, desc)
|
|
defer finished()
|
|
|
|
cmd := exec.CommandContext(ctx, cmdName, args...)
|
|
cmd.Dir = dir
|
|
cmd.Env = env
|
|
cmd.Stdout = stdOut
|
|
cmd.Stderr = stdErr
|
|
if stdIn != nil {
|
|
cmd.Stdin = stdIn
|
|
}
|
|
|
|
if err := cmd.Start(); err != nil {
|
|
return "", "", err
|
|
}
|
|
|
|
err := cmd.Wait()
|
|
if err != nil {
|
|
err = &Error{
|
|
PID: GetPID(ctx),
|
|
Description: desc,
|
|
Err: err,
|
|
CtxErr: ctx.Err(),
|
|
Stdout: stdOut.String(),
|
|
Stderr: stdErr.String(),
|
|
}
|
|
}
|
|
|
|
return stdOut.String(), stdErr.String(), err
|
|
}
|
|
|
|
// Error is a wrapped error describing the error results of Process Execution
|
|
type Error struct {
|
|
PID IDType
|
|
Description string
|
|
Err error
|
|
CtxErr error
|
|
Stdout string
|
|
Stderr string
|
|
}
|
|
|
|
func (err *Error) Error() string {
|
|
return fmt.Sprintf("exec(%s:%s) failed: %v(%v) stdout: %s stderr: %s", err.PID, err.Description, err.Err, err.CtxErr, err.Stdout, err.Stderr)
|
|
}
|
|
|
|
// Unwrap implements the unwrappable implicit interface for go1.13 Unwrap()
|
|
func (err *Error) Unwrap() error {
|
|
return err.Err
|
|
}
|