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package beanstalk
import (
"context"
"net"
"sync"
"time"
"github.com/beanstalkd/go-beanstalk"
"github.com/cenkalti/backoff/v4"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/plugins/logger"
)
type ConnPool struct {
sync.RWMutex
log logger.Logger
conn *beanstalk.Conn
connT *beanstalk.Conn
ts *beanstalk.TubeSet
t *beanstalk.Tube
network string
address string
tName string
tout time.Duration
}
func NewConnPool(network, address, tName string, tout time.Duration, log logger.Logger) (*ConnPool, error) {
connT, err := beanstalk.DialTimeout(network, address, tout)
if err != nil {
return nil, err
}
connTS, err := beanstalk.DialTimeout(network, address, tout)
if err != nil {
return nil, err
}
tube := beanstalk.NewTube(connT, tName)
ts := beanstalk.NewTubeSet(connTS, tName)
return &ConnPool{
log: log,
network: network,
address: address,
tName: tName,
tout: tout,
conn: connTS,
connT: connT,
ts: ts,
t: tube,
}, nil
}
// Put the payload
// TODO use the context ??
func (cp *ConnPool) Put(_ context.Context, body []byte, pri uint32, delay, ttr time.Duration) (uint64, error) {
cp.RLock()
defer cp.RUnlock()
// TODO(rustatian): redial based on the token
id, err := cp.t.Put(body, pri, delay, ttr)
if err != nil {
// errN contains both, err and internal checkAndRedial error
errN := cp.checkAndRedial(err)
if errN != nil {
return 0, errors.Errorf("err: %s\nerr redial: %s", err, errN)
} else {
// retry put only when we redialed
return cp.t.Put(body, pri, delay, ttr)
}
}
return id, nil
}
// Reserve reserves and returns a job from one of the tubes in t. If no
// job is available before time timeout has passed, Reserve returns a
// ConnError recording ErrTimeout.
//
// Typically, a client will reserve a job, perform some work, then delete
// the job with Conn.Delete.
func (cp *ConnPool) Reserve(reserveTimeout time.Duration) (uint64, []byte, error) {
cp.RLock()
defer cp.RUnlock()
id, body, err := cp.ts.Reserve(reserveTimeout)
if err != nil {
// errN contains both, err and internal checkAndRedial error
errN := cp.checkAndRedial(err)
if errN != nil {
return 0, nil, errors.Errorf("err: %s\nerr redial: %s", err, errN)
} else {
// retry Reserve only when we redialed
return cp.ts.Reserve(reserveTimeout)
}
}
return id, body, nil
}
func (cp *ConnPool) Delete(_ context.Context, id uint64) error {
cp.RLock()
defer cp.RUnlock()
err := cp.conn.Delete(id)
if err != nil {
// errN contains both, err and internal checkAndRedial error
errN := cp.checkAndRedial(err)
if errN != nil {
return errors.Errorf("err: %s\nerr redial: %s", err, errN)
} else {
// retry Delete only when we redialed
return cp.conn.Delete(id)
}
}
return nil
}
func (cp *ConnPool) Stats(_ context.Context) (map[string]string, error) {
cp.RLock()
defer cp.RUnlock()
stat, err := cp.conn.Stats()
if err != nil {
errR := cp.checkAndRedial(err)
if errR != nil {
return nil, errors.Errorf("err: %s\nerr redial: %s", err, errR)
} else {
return cp.conn.Stats()
}
}
return stat, nil
}
func (cp *ConnPool) redial() error {
const op = errors.Op("connection_pool_redial")
cp.Lock()
// backoff here
expb := backoff.NewExponentialBackOff()
// TODO(rustatian) set via config
expb.MaxElapsedTime = time.Minute
operation := func() error {
connT, err := beanstalk.DialTimeout(cp.network, cp.address, cp.tout)
if err != nil {
return err
}
if connT == nil {
return errors.E(op, errors.Str("connectionT is nil"))
}
connTS, err := beanstalk.DialTimeout(cp.network, cp.address, cp.tout)
if err != nil {
return err
}
if connTS == nil {
return errors.E(op, errors.Str("connectionTS is nil"))
}
cp.t = beanstalk.NewTube(connT, cp.tName)
cp.ts = beanstalk.NewTubeSet(connTS, cp.tName)
cp.conn = connTS
cp.connT = connT
cp.log.Info("beanstalk redial was successful")
return nil
}
retryErr := backoff.Retry(operation, expb)
if retryErr != nil {
cp.Unlock()
return retryErr
}
cp.Unlock()
return nil
}
var connErrors = map[string]struct{}{"EOF": {}}
func (cp *ConnPool) checkAndRedial(err error) error {
const op = errors.Op("connection_pool_check_redial")
switch et := err.(type) { //nolint:gocritic
// check if the error
case beanstalk.ConnError:
switch bErr := et.Err.(type) {
case *net.OpError:
cp.RUnlock()
errR := cp.redial()
cp.RLock()
// if redial failed - return
if errR != nil {
return errors.E(op, errors.Errorf("%v:%v", bErr, errR))
}
// if redial was successful -> continue listening
return nil
default:
if _, ok := connErrors[et.Err.Error()]; ok {
// if error is related to the broken connection - redial
cp.RUnlock()
errR := cp.redial()
cp.RLock()
// if redial failed - return
if errR != nil {
return errors.E(op, errors.Errorf("%v:%v", err, errR))
}
// if redial was successful -> continue listening
return nil
}
}
}
// return initial error
return err
}
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