Hilbish/job.go

249 lines
4.5 KiB
Go

package main
import (
"io"
"os"
"os/exec"
"sync"
"hilbish/util"
rt "github.com/arnodel/golua/runtime"
"github.com/arnodel/golua/lib/iolib"
)
var jobs *jobHandler
type job struct {
cmd string
running bool
id int
pid int
exitCode int
once bool
args []string
// save path for a few reasons, one being security (lmao) while the other
// would just be so itll be the same binary command always (path changes)
path string
handle *exec.Cmd
stdin io.Reader
stdout io.Writer
stderr io.Writer
}
func (j *job) start() error {
if j.handle == nil || j.once {
// cmd cant be reused so make a new one
cmd := exec.Cmd{
Path: j.path,
Args: j.args,
Stdin: j.stdin,
Stdout: j.stdout,
Stderr: j.stderr,
}
j.setHandle(&cmd)
}
if !j.once {
j.once = true
}
err := j.handle.Start()
proc := j.getProc()
j.pid = proc.Pid
j.running = true
hooks.Em.Emit("job.start", j.lua())
return err
}
func (j *job) stop() {
// finish will be called in exec handle
proc := j.getProc()
if proc != nil {
proc.Kill()
}
}
func (j *job) finish() {
j.running = false
hooks.Em.Emit("job.done", j.lua())
}
func (j *job) setHandle(handle *exec.Cmd) {
j.handle = handle
j.args = handle.Args
j.path = handle.Path
j.stdin = handle.Stdin
j.stdout = handle.Stdout
j.stderr = handle.Stderr
}
func (j *job) getProc() *os.Process {
handle := j.handle
if handle != nil {
return handle.Process
}
return nil
}
func (j *job) setStdio(typ string, f *iolib.File) {
switch typ {
case "in": j.stdin = f.File
case "out": j.stdout = f.File
case "err": j.stderr = f.File
}
}
func (j *job) lua() rt.Value {
jobFuncs := map[string]util.LuaExport{
"stop": {j.luaStop, 0, false},
"start": {j.luaStart, 0, false},
}
luaJob := rt.NewTable()
util.SetExports(l, luaJob, jobFuncs)
luaJob.Set(rt.StringValue("cmd"), rt.StringValue(j.cmd))
luaJob.Set(rt.StringValue("running"), rt.BoolValue(j.running))
luaJob.Set(rt.StringValue("id"), rt.IntValue(int64(j.id)))
luaJob.Set(rt.StringValue("pid"), rt.IntValue(int64(j.pid)))
luaJob.Set(rt.StringValue("exitCode"), rt.IntValue(int64(j.exitCode)))
return rt.TableValue(luaJob)
}
func (j *job) luaStart(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if !j.running {
err := j.start()
exit := handleExecErr(err)
j.exitCode = int(exit)
j.finish()
}
return c.Next(), nil
}
func (j *job) luaStop(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if j.running {
j.stop()
j.finish()
}
return c.Next(), nil
}
type jobHandler struct {
jobs map[int]*job
latestID int
mu *sync.RWMutex
}
func newJobHandler() *jobHandler {
return &jobHandler{
jobs: make(map[int]*job),
latestID: 0,
mu: &sync.RWMutex{},
}
}
func (j *jobHandler) add(cmd string, args []string, path string) *job {
j.mu.Lock()
defer j.mu.Unlock()
j.latestID++
jb := &job{
cmd: cmd,
running: false,
id: j.latestID,
args: args,
path: path,
stdin: os.Stdin,
stdout: os.Stdout,
stderr: os.Stderr,
}
j.jobs[j.latestID] = jb
hooks.Em.Emit("job.add", jb.lua())
return jb
}
func (j *jobHandler) getLatest() *job {
j.mu.RLock()
defer j.mu.RUnlock()
return j.jobs[j.latestID]
}
func (j *jobHandler) loader(rtm *rt.Runtime) *rt.Table {
jobFuncs := map[string]util.LuaExport{
"all": {j.luaAllJobs, 0, false},
"get": {j.luaGetJob, 1, false},
"add": {j.luaAddJob, 2, false},
}
luaJob := rt.NewTable()
util.SetExports(rtm, luaJob, jobFuncs)
return luaJob
}
func (j *jobHandler) luaGetJob(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
j.mu.RLock()
defer j.mu.RUnlock()
if err := c.Check1Arg(); err != nil {
return nil, err
}
jobID, err := c.IntArg(0)
if err != nil {
return nil, err
}
job := j.jobs[int(jobID)]
if job == nil {
return c.Next(), nil
}
return c.PushingNext1(t.Runtime, job.lua()), nil
}
func (j *jobHandler) luaAddJob(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if err := c.CheckNArgs(2); err != nil {
return nil, err
}
cmd, err := c.StringArg(0)
if err != nil {
return nil, err
}
largs, err := c.TableArg(1)
if err != nil {
return nil, err
}
var args []string
util.ForEach(largs, func(k rt.Value, v rt.Value) {
if v.Type() == rt.StringType {
args = append(args, v.AsString())
}
})
// TODO: change to lookpath for args[0]
jb := j.add(cmd, args, args[0])
return c.PushingNext1(t.Runtime, jb.lua()), nil
}
func (j *jobHandler) luaAllJobs(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
j.mu.RLock()
defer j.mu.RUnlock()
jobTbl := rt.NewTable()
for id, job := range j.jobs {
jobTbl.Set(rt.IntValue(int64(id)), job.lua())
}
return c.PushingNext1(t.Runtime, rt.TableValue(jobTbl)), nil
}