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exec.go
183 lines (149 loc) · 3.59 KB
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exec.go
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package exec
import (
"crypto/md5"
"encoding/hex"
"errors"
"fmt"
"io"
"net/url"
"os"
"os/exec"
"strings"
"sync"
"time"
"github.com/AlexxIT/go2rtc/internal/app"
"github.com/AlexxIT/go2rtc/internal/rtsp"
"github.com/AlexxIT/go2rtc/internal/streams"
"github.com/AlexxIT/go2rtc/pkg/core"
"github.com/AlexxIT/go2rtc/pkg/magic"
pkg "github.com/AlexxIT/go2rtc/pkg/rtsp"
"github.com/AlexxIT/go2rtc/pkg/shell"
"github.com/AlexxIT/go2rtc/pkg/stdin"
"github.com/rs/zerolog"
)
func Init() {
rtsp.HandleFunc(func(conn *pkg.Conn) bool {
waitersMu.Lock()
waiter := waiters[conn.URL.Path]
waitersMu.Unlock()
if waiter == nil {
return false
}
// unblocking write to channel
select {
case waiter <- conn:
return true
default:
return false
}
})
streams.HandleFunc("exec", execHandle)
log = app.GetLogger("exec")
}
func execHandle(rawURL string) (core.Producer, error) {
var path string
var query url.Values
// RTSP flow should have `{output}` inside URL
// pipe flow may have `#{params}` inside URL
if i := strings.Index(rawURL, "{output}"); i > 0 {
if rtsp.Port == "" {
return nil, errors.New("exec: rtsp module disabled")
}
sum := md5.Sum([]byte(rawURL))
path = "/" + hex.EncodeToString(sum[:])
rawURL = rawURL[:i] + "rtsp://127.0.0.1:" + rtsp.Port + path + rawURL[i+8:]
} else if i = strings.IndexByte(rawURL, '#'); i > 0 {
query = streams.ParseQuery(rawURL[i+1:])
rawURL = rawURL[:i]
}
args := shell.QuoteSplit(rawURL[5:]) // remove `exec:`
cmd := exec.Command(args[0], args[1:]...)
if log.Debug().Enabled() {
cmd.Stderr = os.Stderr
}
if path == "" {
return handlePipe(rawURL, cmd, query)
}
return handleRTSP(rawURL, cmd, path)
}
func handlePipe(_ string, cmd *exec.Cmd, query url.Values) (core.Producer, error) {
if query.Get("backchannel") == "1" {
return stdin.NewClient(cmd)
}
r, err := PipeCloser(cmd, query)
if err != nil {
return nil, err
}
if err = cmd.Start(); err != nil {
return nil, err
}
prod, err := magic.Open(r)
if err != nil {
_ = r.Close()
}
return prod, err
}
func handleRTSP(url string, cmd *exec.Cmd, path string) (core.Producer, error) {
stderr := limitBuffer{buf: make([]byte, 512)}
if cmd.Stderr != nil {
cmd.Stderr = io.MultiWriter(cmd.Stderr, &stderr)
} else {
cmd.Stderr = &stderr
}
if log.Trace().Enabled() {
cmd.Stdout = os.Stdout
}
waiter := make(chan core.Producer)
waitersMu.Lock()
waiters[path] = waiter
waitersMu.Unlock()
defer func() {
waitersMu.Lock()
delete(waiters, path)
waitersMu.Unlock()
}()
log.Debug().Str("url", url).Str("cmd", fmt.Sprintf("%s", strings.Join(cmd.Args, " "))).Msg("[exec] run")
ts := time.Now()
if err := cmd.Start(); err != nil {
log.Error().Err(err).Str("url", url).Msg("[exec]")
return nil, err
}
done := make(chan error, 1)
go func() {
done <- cmd.Wait()
}()
select {
case <-time.After(time.Second * 60):
_ = cmd.Process.Kill()
log.Error().Str("url", url).Msg("[exec] timeout")
return nil, errors.New("timeout")
case <-done:
// limit message size
return nil, errors.New("exec: " + stderr.String())
case prod := <-waiter:
log.Debug().Stringer("launch", time.Since(ts)).Msg("[exec] run")
return prod, nil
}
}
// internal
var (
log zerolog.Logger
waiters = map[string]chan core.Producer{}
waitersMu sync.Mutex
)
type limitBuffer struct {
buf []byte
n int
}
func (l *limitBuffer) String() string {
if l.n == len(l.buf) {
return string(l.buf) + "..."
}
return string(l.buf[:l.n])
}
func (l *limitBuffer) Write(p []byte) (int, error) {
if l.n < cap(l.buf) {
l.n += copy(l.buf[l.n:], p)
}
return len(p), nil
}