2019-02-26 03:01:13 +01:00
|
|
|
/*
|
2019-04-09 20:39:42 +02:00
|
|
|
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
|
2019-02-26 03:01:13 +01:00
|
|
|
*
|
|
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
|
|
* you may not use this file except in compliance with the License.
|
|
|
|
* You may obtain a copy of the License at
|
|
|
|
*
|
|
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
*
|
|
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
|
|
* See the License for the specific language governing permissions and
|
|
|
|
* limitations under the License.
|
|
|
|
*/
|
|
|
|
|
|
|
|
package target
|
|
|
|
|
|
|
|
import (
|
|
|
|
"errors"
|
2019-04-10 14:46:01 +02:00
|
|
|
"fmt"
|
2019-07-05 11:51:41 +02:00
|
|
|
"net"
|
|
|
|
"os"
|
2019-04-10 14:46:01 +02:00
|
|
|
"strings"
|
2019-07-05 11:51:41 +02:00
|
|
|
"syscall"
|
2019-04-10 14:46:01 +02:00
|
|
|
"time"
|
|
|
|
|
2019-02-26 03:01:13 +01:00
|
|
|
"github.com/minio/minio/pkg/event"
|
|
|
|
)
|
|
|
|
|
2019-04-10 14:46:01 +02:00
|
|
|
const retryInterval = 3 * time.Second
|
|
|
|
|
|
|
|
// errNotConnected - indicates that the target connection is not active.
|
|
|
|
var errNotConnected = errors.New("not connected to target server/service")
|
2019-02-26 03:01:13 +01:00
|
|
|
|
2019-04-10 14:46:01 +02:00
|
|
|
// errLimitExceeded error is sent when the maximum limit is reached.
|
|
|
|
var errLimitExceeded = errors.New("the maximum store limit reached")
|
|
|
|
|
2019-02-26 03:01:13 +01:00
|
|
|
// Store - To persist the events.
|
|
|
|
type Store interface {
|
|
|
|
Put(event event.Event) error
|
|
|
|
Get(key string) (event.Event, error)
|
2019-05-22 22:34:48 +02:00
|
|
|
List() []string
|
2019-04-10 14:46:01 +02:00
|
|
|
Del(key string) error
|
2019-02-26 03:01:13 +01:00
|
|
|
Open() error
|
|
|
|
}
|
2019-04-10 14:46:01 +02:00
|
|
|
|
|
|
|
// replayEvents - Reads the events from the store and replays.
|
|
|
|
func replayEvents(store Store, doneCh <-chan struct{}) <-chan string {
|
|
|
|
var names []string
|
|
|
|
eventKeyCh := make(chan string)
|
|
|
|
|
|
|
|
go func() {
|
|
|
|
retryTimer := time.NewTimer(retryInterval)
|
|
|
|
defer retryTimer.Stop()
|
|
|
|
defer close(eventKeyCh)
|
|
|
|
for {
|
2019-05-22 22:34:48 +02:00
|
|
|
names = store.List()
|
2019-04-10 14:46:01 +02:00
|
|
|
for _, name := range names {
|
|
|
|
select {
|
|
|
|
case eventKeyCh <- strings.TrimSuffix(name, eventExt):
|
|
|
|
// Get next key.
|
|
|
|
case <-doneCh:
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if len(names) < 2 {
|
|
|
|
retryTimer.Reset(retryInterval)
|
|
|
|
select {
|
|
|
|
case <-retryTimer.C:
|
|
|
|
case <-doneCh:
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
|
|
|
|
return eventKeyCh
|
|
|
|
}
|
|
|
|
|
2019-07-23 19:22:08 +02:00
|
|
|
// IsConnRefusedErr - To check fot "connection refused" error.
|
|
|
|
func IsConnRefusedErr(err error) bool {
|
|
|
|
if opErr, ok := err.(*net.OpError); ok {
|
|
|
|
if sysErr, ok := opErr.Err.(*os.SyscallError); ok {
|
|
|
|
if errno, ok := sysErr.Err.(syscall.Errno); ok {
|
|
|
|
if errno == syscall.ECONNREFUSED {
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
2019-09-05 22:55:48 +02:00
|
|
|
// IsConnResetErr - Checks for connection reset errors.
|
|
|
|
func IsConnResetErr(err error) bool {
|
|
|
|
if strings.Contains(err.Error(), "connection reset by peer") {
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
// incase if error message is wrapped.
|
2019-07-05 11:51:41 +02:00
|
|
|
if opErr, ok := err.(*net.OpError); ok {
|
|
|
|
if syscallErr, ok := opErr.Err.(*os.SyscallError); ok {
|
|
|
|
if syscallErr.Err == syscall.ECONNRESET {
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
2019-04-10 14:46:01 +02:00
|
|
|
// sendEvents - Reads events from the store and re-plays.
|
|
|
|
func sendEvents(target event.Target, eventKeyCh <-chan string, doneCh <-chan struct{}) {
|
|
|
|
retryTimer := time.NewTimer(retryInterval)
|
|
|
|
defer retryTimer.Stop()
|
|
|
|
|
|
|
|
send := func(eventKey string) bool {
|
|
|
|
for {
|
|
|
|
err := target.Send(eventKey)
|
|
|
|
if err == nil {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
|
2019-09-05 22:55:48 +02:00
|
|
|
if err != errNotConnected && !IsConnResetErr(err) {
|
2019-04-10 14:46:01 +02:00
|
|
|
panic(fmt.Errorf("target.Send() failed with '%v'", err))
|
|
|
|
}
|
|
|
|
|
|
|
|
retryTimer.Reset(retryInterval)
|
|
|
|
select {
|
|
|
|
case <-retryTimer.C:
|
|
|
|
case <-doneCh:
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
|
|
|
|
for {
|
|
|
|
select {
|
|
|
|
case eventKey, ok := <-eventKeyCh:
|
|
|
|
if !ok {
|
|
|
|
// closed channel.
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
if !send(eventKey) {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
case <-doneCh:
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|