-
Notifications
You must be signed in to change notification settings - Fork 0
/
periodic.go
184 lines (167 loc) · 4.4 KB
/
periodic.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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*
Copyright 2018 Gravitational, Inc.
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 lite
import (
"database/sql"
"time"
"github.com/gravitational/teleport/lib/backend"
"github.com/gravitational/trace"
)
const notSet = -2
func (l *LiteBackend) runPeriodicOperations() {
t := time.NewTicker(l.PollStreamPeriod)
defer t.Stop()
rowid := int64(notSet)
for {
select {
case <-l.ctx.Done():
l.closeDatabase()
return
case <-t.C:
err := l.removeExpiredKeys()
if err != nil {
// connection problem means that database is closed
// or is closing, downgrade the log to debug
// to avoid polluting logs in production
if trace.IsConnectionProblem(err) {
l.Debugf("Failed to run remove expired keys: %v", err)
} else {
l.Warningf("Failed to run remove expired keys: %v", err)
}
}
if !l.EventsOff {
err = l.removeOldEvents()
if err != nil {
l.Warningf("Failed to run remove old events: %v", err)
}
rowid, err = l.pollEvents(rowid)
if err != nil {
l.Warningf("Failed to run poll events: %v", err)
}
}
}
}
}
func (l *LiteBackend) removeExpiredKeys() error {
// In mirror mode, don't expire any elements. This allows the cache to setup
// a watch and expire elements as the events roll in.
if l.Mirror {
return nil
}
now := l.clock.Now().UTC()
return l.inTransaction(l.ctx, func(tx *sql.Tx) error {
q, err := tx.PrepareContext(l.ctx,
"SELECT key FROM kv WHERE expires <= ? ORDER BY key LIMIT ?")
if err != nil {
return trace.Wrap(err)
}
rows, err := q.QueryContext(l.ctx, now, l.BufferSize)
if err != nil {
return trace.Wrap(err)
}
defer rows.Close()
var keys [][]byte
for rows.Next() {
var key []byte
if err := rows.Scan(&key); err != nil {
return trace.Wrap(err)
}
keys = append(keys, key)
}
for i := range keys {
if err := l.deleteInTransaction(l.ctx, keys[i], tx); err != nil {
return trace.Wrap(err)
}
}
return nil
})
}
func (l *LiteBackend) removeOldEvents() error {
expiryTime := l.clock.Now().UTC().Add(-1 * backend.DefaultEventsTTL)
return l.inTransaction(l.ctx, func(tx *sql.Tx) error {
stmt, err := tx.PrepareContext(l.ctx, "DELETE FROM events WHERE created <= ?")
if err != nil {
return trace.Wrap(err)
}
_, err = stmt.ExecContext(l.ctx, expiryTime)
if err != nil {
return trace.Wrap(err)
}
return nil
})
}
func (l *LiteBackend) pollEvents(rowid int64) (int64, error) {
if rowid == notSet {
err := l.inTransaction(l.ctx, func(tx *sql.Tx) error {
q, err := tx.PrepareContext(
l.ctx,
"SELECT id from events ORDER BY id DESC LIMIT 1")
if err != nil {
return trace.Wrap(err)
}
row := q.QueryRow()
if err := row.Scan(&rowid); err != nil {
if err != sql.ErrNoRows {
return trace.Wrap(err)
}
rowid = -1
} else {
rowid = rowid - 1
}
return nil
})
if err != nil {
return rowid, trace.Wrap(err)
}
l.Debugf("Initialized event ID iterator to %v", rowid)
l.signalWatchStart()
}
var events []backend.Event
var lastID int64
err := l.inTransaction(l.ctx, func(tx *sql.Tx) error {
q, err := tx.PrepareContext(l.ctx,
"SELECT id, type, kv_key, kv_value, kv_modified, kv_expires FROM events WHERE id > ? ORDER BY id LIMIT ?")
if err != nil {
return trace.Wrap(err)
}
limit := l.BufferSize / 2
if limit <= 0 {
limit = 1
}
rows, err := q.QueryContext(l.ctx, rowid, limit)
if err != nil {
return trace.Wrap(err)
}
defer rows.Close()
for rows.Next() {
var event backend.Event
var expires NullTime
if err := rows.Scan(&lastID, &event.Type, &event.Item.Key, &event.Item.Value, &event.Item.ID, &expires); err != nil {
return trace.Wrap(err)
}
if expires.Valid {
event.Item.Expires = expires.Time
}
events = append(events, event)
}
return nil
})
if err != nil {
return rowid, trace.Wrap(err)
}
l.buf.PushBatch(events)
if len(events) != 0 {
return lastID, nil
}
return rowid, nil
}