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package roadrunner
import (
"context"
"fmt"
"time"
"github.com/pkg/errors"
"github.com/spiral/goridge/v2"
)
var EmptyPayload = Payload{}
type SyncWorker interface {
// WorkerBase provides basic functionality for the SyncWorker
WorkerBase
// Exec used to execute payload on the SyncWorker
Exec(ctx context.Context, rqs Payload) (Payload, error)
}
type taskWorker struct {
w WorkerBase
}
func NewSyncWorker(w WorkerBase) (SyncWorker, error) {
return &taskWorker{
w: w,
}, nil
}
type twexec struct {
payload Payload
err error
}
func (tw *taskWorker) Exec(ctx context.Context, rqs Payload) (Payload, error) {
c := make(chan twexec)
go func() {
if len(rqs.Body) == 0 && len(rqs.Context) == 0 {
c <- twexec{
payload: EmptyPayload,
err: fmt.Errorf("payload can not be empty"),
}
return
}
if tw.w.State().Value() != StateReady {
c <- twexec{
payload: EmptyPayload,
err: fmt.Errorf("WorkerProcess is not ready (%s)", tw.w.State().String()),
}
return
}
// set last used time
tw.w.State().SetLastUsed(uint64(time.Now().UnixNano()))
tw.w.State().Set(StateWorking)
rsp, err := tw.execPayload(rqs)
if err != nil {
if _, ok := err.(TaskError); !ok {
tw.w.State().Set(StateErrored)
tw.w.State().RegisterExec()
}
c <- twexec{
payload: EmptyPayload,
err: err,
}
return
}
tw.w.State().Set(StateReady)
tw.w.State().RegisterExec()
c <- twexec{
payload: rsp,
err: nil,
}
return
}()
for {
select {
case <-ctx.Done():
return EmptyPayload, ctx.Err()
case res := <-c:
if res.err != nil {
return EmptyPayload, res.err
}
return res.payload, nil
}
}
}
func (tw *taskWorker) execPayload(rqs Payload) (Payload, error) {
// two things; todo: merge
if err := sendControl(tw.w.Relay(), rqs.Context); err != nil {
return EmptyPayload, errors.Wrap(err, "header error")
}
if err := tw.w.Relay().Send(rqs.Body, 0); err != nil {
return EmptyPayload, errors.Wrap(err, "sender error")
}
var pr goridge.Prefix
rsp := Payload{}
var err error
if rsp.Context, pr, err = tw.w.Relay().Receive(); err != nil {
return EmptyPayload, errors.Wrap(err, "WorkerProcess error")
}
if !pr.HasFlag(goridge.PayloadControl) {
return EmptyPayload, fmt.Errorf("malformed WorkerProcess response")
}
if pr.HasFlag(goridge.PayloadError) {
return EmptyPayload, TaskError(rsp.Context)
}
// add streaming support :)
if rsp.Body, pr, err = tw.w.Relay().Receive(); err != nil {
return EmptyPayload, errors.Wrap(err, "WorkerProcess error")
}
return rsp, nil
}
func (tw *taskWorker) String() string {
return tw.w.String()
}
func (tw *taskWorker) Created() time.Time {
return tw.w.Created()
}
func (tw *taskWorker) Events() <-chan WorkerEvent {
return tw.w.Events()
}
func (tw *taskWorker) Pid() int64 {
return tw.w.Pid()
}
func (tw *taskWorker) State() State {
return tw.w.State()
}
func (tw *taskWorker) Start() error {
return tw.w.Start()
}
func (tw *taskWorker) Wait(ctx context.Context) error {
return tw.w.Wait(ctx)
}
func (tw *taskWorker) Stop(ctx context.Context) error {
return tw.w.Stop(ctx)
}
func (tw *taskWorker) Kill(ctx context.Context) error {
return tw.w.Kill(ctx)
}
func (tw *taskWorker) Relay() goridge.Relay {
return tw.w.Relay()
}
func (tw *taskWorker) AttachRelay(rl goridge.Relay) {
tw.w.AttachRelay(rl)
}
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