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// 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"
"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()
)
// Process represents a working process inheriting from Gitea.
type Process struct {
PID int64 // Process ID, not system one.
Description string
Start time.Time
Cancel context.CancelFunc
}
// Manager knows about all processes and counts PIDs.
type Manager struct {
mutex sync.Mutex
counter int64
processes map[int64]*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[int64]*Process),
}
})
return manager
}
// Add a process to the ProcessManager and returns its PID.
func (pm *Manager) Add(description string, cancel context.CancelFunc) int64 {
pm.mutex.Lock()
pid := pm.counter + 1
pm.processes[pid] = &Process{
PID: pid,
Description: description,
Start: time.Now(),
Cancel: cancel,
}
pm.counter = pid
pm.mutex.Unlock()
return pid
}
// Remove a process from the ProcessManager.
func (pm *Manager) Remove(pid int64) {
pm.mutex.Lock()
delete(pm.processes, pid)
pm.mutex.Unlock()
}
// Cancel a process in the ProcessManager.
func (pm *Manager) Cancel(pid int64) {
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() []*Process {
pm.mutex.Lock()
processes := make([]*Process, 0, len(pm.processes))
for _, process := range pm.processes {
processes = append(processes, process)
}
pm.mutex.Unlock()
sort.Sort(processList(processes))
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(-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(timeout, "", desc, cmdName, args...)
}
// ExecDir a command and use the default timeout.
func (pm *Manager) ExecDir(timeout time.Duration, dir, desc, cmdName string, args ...string) (string, string, error) {
return pm.ExecDirEnv(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(timeout time.Duration, dir, desc string, env []string, cmdName string, args ...string) (string, string, error) {
return pm.ExecDirEnvStdIn(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(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, cancel := context.WithTimeout(DefaultContext, timeout)
defer cancel()
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
}
pid := pm.Add(desc, cancel)
err := cmd.Wait()
pm.Remove(pid)
if err != nil {
err = &Error{
PID: pid,
Description: desc,
Err: err,
CtxErr: ctx.Err(),
Stdout: stdOut.String(),
Stderr: stdErr.String(),
}
}
return stdOut.String(), stdErr.String(), err
}
type processList []*Process
func (l processList) Len() int {
return len(l)
}
func (l processList) Less(i, j int) bool {
return l[i].PID < l[j].PID
}
func (l processList) Swap(i, j int) {
l[i], l[j] = l[j], l[i]
}
// Error is a wrapped error describing the error results of Process Execution
type Error struct {
PID int64
Description string
Err error
CtxErr error
Stdout string
Stderr string
}
func (err *Error) Error() string {
return fmt.Sprintf("exec(%d:%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
}
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