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package beanstalk
import (
"fmt"
"github.com/beanstalkd/go-beanstalk"
"github.com/spiral/jobs/v2"
"strconv"
"sync"
"sync/atomic"
"time"
)
type tube struct {
active int32
pipe *jobs.Pipeline
mut sync.Mutex
tube *beanstalk.Tube
tubeSet *beanstalk.TubeSet
reserve time.Duration
// tube events
lsn func(event int, ctx interface{})
// stop channel
wait chan interface{}
// active operations
muw sync.RWMutex
wg sync.WaitGroup
// exec handlers
execPool chan jobs.Handler
errHandler jobs.ErrorHandler
}
type entry struct {
id uint64
data []byte
}
func (e *entry) String() string {
return fmt.Sprintf("%v", e.id)
}
// create new tube consumer and producer
func newTube(pipe *jobs.Pipeline, lsn func(event int, ctx interface{})) (*tube, error) {
if pipe.String("tube", "") == "" {
return nil, fmt.Errorf("missing `tube` parameter on beanstalk pipeline")
}
return &tube{
pipe: pipe,
tube: &beanstalk.Tube{Name: pipe.String("tube", "")},
tubeSet: beanstalk.NewTubeSet(nil, pipe.String("tube", "")),
reserve: pipe.Duration("reserve", time.Second),
lsn: lsn,
}, nil
}
// run consumers
func (t *tube) serve(connector connFactory) {
// tube specific consume connection
cn, err := connector.newConn()
if err != nil {
t.report(err)
return
}
defer cn.Close()
t.wait = make(chan interface{})
atomic.StoreInt32(&t.active, 1)
for {
e, err := t.consume(cn)
if err != nil {
if isConnError(err) {
t.report(err)
}
continue
}
if e == nil {
return
}
h := <-t.execPool
go func(h jobs.Handler, e *entry) {
err := t.do(cn, h, e)
t.execPool <- h
t.wg.Done()
t.report(err)
}(h, e)
}
}
// fetch consume
func (t *tube) consume(cn *conn) (*entry, error) {
t.muw.Lock()
defer t.muw.Unlock()
select {
case <-t.wait:
return nil, nil
default:
conn, err := cn.acquire(false)
if err != nil {
return nil, err
}
t.tubeSet.Conn = conn
id, data, err := t.tubeSet.Reserve(t.reserve)
cn.release(err)
if err != nil {
return nil, err
}
t.wg.Add(1)
return &entry{id: id, data: data}, nil
}
}
// do data
func (t *tube) do(cn *conn, h jobs.Handler, e *entry) error {
j, err := unpack(e.data)
if err != nil {
return err
}
err = h(e.String(), j)
// mandatory acquisition
conn, connErr := cn.acquire(true)
if connErr != nil {
// possible if server is dead
return connErr
}
if err == nil {
return cn.release(conn.Delete(e.id))
}
stat, statErr := conn.StatsJob(e.id)
if statErr != nil {
return cn.release(statErr)
}
t.errHandler(e.String(), j, err)
reserves, ok := strconv.Atoi(stat["reserves"])
if ok != nil || !j.Options.CanRetry(reserves-1) {
return cn.release(conn.Bury(e.id, 0))
}
return cn.release(conn.Release(e.id, 0, j.Options.RetryDuration()))
}
// stop tube consuming
func (t *tube) stop() {
if atomic.LoadInt32(&t.active) == 0 {
return
}
atomic.StoreInt32(&t.active, 0)
close(t.wait)
t.muw.Lock()
t.wg.Wait()
t.muw.Unlock()
}
// put data into pool or return error (no wait), this method will try to reattempt operation if
// dead conn found.
func (t *tube) put(cn *conn, attempt int, data []byte, delay, rrt time.Duration) (id string, err error) {
id, err = t.doPut(cn, attempt, data, delay, rrt)
if err != nil && isConnError(err) {
return t.doPut(cn, attempt, data, delay, rrt)
}
return id, err
}
// perform put operation
func (t *tube) doPut(cn *conn, attempt int, data []byte, delay, rrt time.Duration) (id string, err error) {
conn, err := cn.acquire(false)
if err != nil {
return "", err
}
var bid uint64
t.mut.Lock()
t.tube.Conn = conn
bid, err = t.tube.Put(data, 0, delay, rrt)
t.mut.Unlock()
return strconv.FormatUint(bid, 10), cn.release(err)
}
// return tube stats (retries)
func (t *tube) stat(cn *conn) (stat *jobs.Stat, err error) {
stat, err = t.doStat(cn)
if err != nil && isConnError(err) {
return t.doStat(cn)
}
return stat, err
}
// return tube stats
func (t *tube) doStat(cn *conn) (stat *jobs.Stat, err error) {
conn, err := cn.acquire(false)
if err != nil {
return nil, err
}
t.mut.Lock()
t.tube.Conn = conn
values, err := t.tube.Stats()
t.mut.Unlock()
if err != nil {
return nil, cn.release(err)
}
stat = &jobs.Stat{InternalName: t.tube.Name}
if v, err := strconv.Atoi(values["current-jobs-ready"]); err == nil {
stat.Queue = int64(v)
}
if v, err := strconv.Atoi(values["current-jobs-reserved"]); err == nil {
stat.Active = int64(v)
}
if v, err := strconv.Atoi(values["current-jobs-delayed"]); err == nil {
stat.Delayed = int64(v)
}
return stat, cn.release(nil)
}
// report tube specific error
func (t *tube) report(err error) {
if err != nil {
t.lsn(jobs.EventPipeError, &jobs.PipelineError{Pipeline: t.pipe, Caused: err})
}
}
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