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package roadrunner
import (
"context"
"os/exec"
"github.com/spiral/errors"
"github.com/spiral/goridge/v3"
"go.uber.org/multierr"
)
// PipeFactory connects to stack using standard
// streams (STDIN, STDOUT pipes).
type PipeFactory struct{}
// NewPipeFactory returns new factory instance and starts
// listening
// todo: review tests
func NewPipeFactory() Factory {
return &PipeFactory{}
}
type SpawnResult struct {
w WorkerBase
err error
}
// SpawnWorker creates new WorkerProcess and connects it to goridge relay,
// method Wait() must be handled on level above.
func (f *PipeFactory) SpawnWorkerWithContext(ctx context.Context, cmd *exec.Cmd) (WorkerBase, error) {
c := make(chan SpawnResult)
const op = errors.Op("spawn worker with context")
go func() {
w, err := InitBaseWorker(cmd)
if err != nil {
c <- SpawnResult{
w: nil,
err: errors.E(op, err),
}
return
}
// TODO why out is in?
in, err := cmd.StdoutPipe()
if err != nil {
c <- SpawnResult{
w: nil,
err: errors.E(op, err),
}
return
}
// TODO why in is out?
out, err := cmd.StdinPipe()
if err != nil {
c <- SpawnResult{
w: nil,
err: errors.E(op, err),
}
return
}
// Init new PIPE relay
relay := goridge.NewPipeRelay(in, out)
w.AttachRelay(relay)
// Start the worker
err = w.Start()
if err != nil {
c <- SpawnResult{
w: nil,
err: errors.E(op, err),
}
return
}
// errors bundle
pid, err := fetchPID(relay)
if pid != w.Pid() || err != nil {
err = multierr.Combine(
err,
w.Kill(),
w.Wait(),
)
c <- SpawnResult{
w: nil,
err: errors.E(op, err),
}
return
}
// everything ok, set ready state
w.State().Set(StateReady)
// return worker
c <- SpawnResult{
w: w,
err: nil,
}
}()
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 *PipeFactory) SpawnWorker(cmd *exec.Cmd) (WorkerBase, error) {
const op = errors.Op("spawn worker")
w, err := InitBaseWorker(cmd)
if err != nil {
return nil, errors.E(op, err)
}
// TODO why out is in?
in, err := cmd.StdoutPipe()
if err != nil {
return nil, errors.E(op, err)
}
// TODO why in is out?
out, err := cmd.StdinPipe()
if err != nil {
return nil, errors.E(op, err)
}
// Init new PIPE relay
relay := goridge.NewPipeRelay(in, out)
w.AttachRelay(relay)
// Start the worker
err = w.Start()
if err != nil {
return nil, errors.E(op, err)
}
// errors bundle
if pid, err := fetchPID(relay); pid != w.Pid() {
err = multierr.Combine(
err,
w.Kill(),
w.Wait(),
)
return nil, errors.E(op, err)
}
// everything ok, set ready state
w.State().Set(StateReady)
return w, nil
}
// Close the factory.
func (f *PipeFactory) Close(ctx context.Context) error {
return nil
}
|
