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package socket
import (
"context"
"fmt"
"net"
"os/exec"
"sync"
"time"
"github.com/shirou/gopsutil/process"
"github.com/spiral/errors"
"github.com/spiral/goridge/v3/pkg/relay"
"github.com/spiral/goridge/v3/pkg/socket"
"github.com/spiral/roadrunner/v2/internal"
"github.com/spiral/roadrunner/v2/pkg/events"
"github.com/spiral/roadrunner/v2/pkg/worker"
"go.uber.org/multierr"
"golang.org/x/sync/errgroup"
)
// Factory connects to external stack using socket server.
type Factory struct {
// listens for incoming connections from underlying processes
ls net.Listener
// relay connection timeout
tout time.Duration
// sockets which are waiting for process association
relays sync.Map
}
// NewSocketServer returns Factory attached to a given socket listener.
// tout specifies for how long factory should serve for incoming relay connection
func NewSocketServer(ls net.Listener, tout time.Duration) *Factory {
f := &Factory{
ls: ls,
tout: tout,
relays: sync.Map{},
}
// Be careful
// https://github.com/go101/go101/wiki/About-memory-ordering-guarantees-made-by-atomic-operations-in-Go
// https://github.com/golang/go/issues/5045
go func() {
err := f.listen()
// there is no logger here, use fmt
if err != nil {
fmt.Printf("[WARN]: socket server listen, error: %v\n", err)
}
}()
return f
}
// blocking operation, returns an error
func (f *Factory) listen() error {
errGr := &errgroup.Group{}
errGr.Go(func() error {
for {
conn, err := f.ls.Accept()
if err != nil {
return err
}
rl := socket.NewSocketRelay(conn)
pid, err := internal.FetchPID(rl)
if err != nil {
return err
}
f.attachRelayToPid(pid, rl)
}
})
return errGr.Wait()
}
type socketSpawn struct {
w *worker.Process
err error
}
// SpawnWorkerWithTimeout creates Process and connects it to appropriate relay or return an error
func (f *Factory) SpawnWorkerWithTimeout(ctx context.Context, cmd *exec.Cmd, listeners ...events.Listener) (*worker.Process, error) {
const op = errors.Op("factory_spawn_worker_with_timeout")
c := make(chan socketSpawn)
go func() {
ctxT, cancel := context.WithTimeout(ctx, f.tout)
defer cancel()
w, err := worker.InitBaseWorker(cmd, worker.AddListeners(listeners...))
if err != nil {
select {
case c <- socketSpawn{
w: nil,
err: errors.E(op, err),
}:
return
default:
return
}
}
err = w.Start()
if err != nil {
select {
case c <- socketSpawn{
w: nil,
err: errors.E(op, err),
}:
return
default:
return
}
}
rl, err := f.findRelayWithContext(ctxT, w)
if err != nil {
err = multierr.Combine(
err,
w.Kill(),
w.Wait(),
)
select {
// try to write result
case c <- socketSpawn{
w: nil,
err: errors.E(op, err),
}:
return
// if no receivers - return
default:
return
}
}
w.AttachRelay(rl)
w.State().Set(worker.StateReady)
select {
case c <- socketSpawn{
w: w,
err: nil,
}:
return
default:
_ = w.Kill()
return
}
}()
select {
case <-ctx.Done():
return nil, ctx.Err()
case res := <-c:
if res.err != nil {
return nil, res.err
}
return res.w, nil
}
}
func (f *Factory) SpawnWorker(cmd *exec.Cmd, listeners ...events.Listener) (*worker.Process, error) {
const op = errors.Op("factory_spawn_worker")
w, err := worker.InitBaseWorker(cmd, worker.AddListeners(listeners...))
if err != nil {
return nil, err
}
err = w.Start()
if err != nil {
return nil, errors.E(op, err)
}
rl, err := f.findRelay(w)
if err != nil {
err = multierr.Combine(
err,
w.Kill(),
w.Wait(),
)
return nil, err
}
w.AttachRelay(rl)
// errors bundle
if pid, err := internal.FetchPID(rl); pid != w.Pid() {
err = multierr.Combine(
err,
w.Kill(),
w.Wait(),
)
return nil, errors.E(op, err)
}
w.State().Set(worker.StateReady)
return w, nil
}
// Close socket factory and underlying socket connection.
func (f *Factory) Close() error {
return f.ls.Close()
}
// waits for Process to connect over socket and returns associated relay of timeout
func (f *Factory) findRelayWithContext(ctx context.Context, w worker.BaseProcess) (*socket.Relay, error) {
ticker := time.NewTicker(time.Millisecond * 10)
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-ticker.C:
// check for the process exists
_, err := process.NewProcess(int32(w.Pid()))
if err != nil {
return nil, err
}
default:
tmp, ok := f.relays.LoadAndDelete(w.Pid())
if !ok {
continue
}
return tmp.(*socket.Relay), nil
}
}
}
func (f *Factory) findRelay(w worker.BaseProcess) (*socket.Relay, error) {
const op = errors.Op("factory_find_relay")
// poll every 1ms for the relay
pollDone := time.NewTimer(f.tout)
for {
select {
case <-pollDone.C:
return nil, errors.E(op, errors.Str("relay timeout"))
default:
tmp, ok := f.relays.Load(w.Pid())
if !ok {
continue
}
return tmp.(*socket.Relay), nil
}
}
}
// chan to store relay associated with specific pid
func (f *Factory) attachRelayToPid(pid int64, relay relay.Relay) {
f.relays.Store(pid, relay)
}
|
