forked from minio/minio
-
Notifications
You must be signed in to change notification settings - Fork 0
/
store.go
144 lines (124 loc) · 3.53 KB
/
store.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package target
import (
"context"
"errors"
"fmt"
"strings"
"syscall"
"time"
"github.com/memoio/minio/internal/event"
)
const retryInterval = 3 * time.Second
// errNotConnected - indicates that the target connection is not active.
var errNotConnected = errors.New("not connected to target server/service")
// errLimitExceeded error is sent when the maximum limit is reached.
var errLimitExceeded = errors.New("the maximum store limit reached")
// Store - To persist the events.
type Store interface {
Put(event event.Event) error
Get(key string) (event.Event, error)
List() ([]string, error)
Del(key string) error
Open() error
}
// replayEvents - Reads the events from the store and replays.
func replayEvents(store Store, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), id event.TargetID) <-chan string {
eventKeyCh := make(chan string)
go func() {
retryTicker := time.NewTicker(retryInterval)
defer retryTicker.Stop()
defer close(eventKeyCh)
for {
names, err := store.List()
if err == nil {
for _, name := range names {
select {
case eventKeyCh <- strings.TrimSuffix(name, eventExt):
// Get next key.
case <-doneCh:
return
}
}
}
if len(names) < 2 {
select {
case <-retryTicker.C:
if err != nil {
loggerOnce(context.Background(),
fmt.Errorf("store.List() failed '%w'", err), id)
}
case <-doneCh:
return
}
}
}
}()
return eventKeyCh
}
// IsConnRefusedErr - To check fot "connection refused" error.
func IsConnRefusedErr(err error) bool {
return errors.Is(err, syscall.ECONNREFUSED)
}
// 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.
return errors.Is(err, syscall.ECONNRESET)
}
// sendEvents - Reads events from the store and re-plays.
func sendEvents(target event.Target, eventKeyCh <-chan string, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{})) {
retryTicker := time.NewTicker(retryInterval)
defer retryTicker.Stop()
send := func(eventKey string) bool {
for {
err := target.Send(eventKey)
if err == nil {
break
}
if err != errNotConnected && !IsConnResetErr(err) {
loggerOnce(context.Background(),
fmt.Errorf("target.Send() failed with '%w'", err),
target.ID())
}
// Retrying after 3secs back-off
select {
case <-retryTicker.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
}
}
}