/
provider.go
112 lines (96 loc) · 2.92 KB
/
provider.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
// Copyright 2018 Trillian Authors
//
// 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 crdb
import (
"database/sql"
"flag"
"sync"
"github.com/google/trillian/monitoring"
"github.com/google/trillian/storage"
"k8s.io/klog/v2"
_ "github.com/cockroachdb/cockroach-go/v2/crdb/crdbpgx" // crdb retries and postgres interface
_ "github.com/lib/pq" // Register the Postgres driver.
)
const (
// StorageProviderName is the name of the storage provider.
StorageProviderName = "crdb"
)
var (
crdbURI = flag.String("crdb_uri", "postgresql://root@localhost:26257?sslmode=disable", "Connection URI for CockroachDB database")
maxConns = flag.Int("crdb_max_conns", 0, "Maximum connections to the database")
maxIdle = flag.Int("crdb_max_idle_conns", -1, "Maximum idle database connections in the connection pool")
crdbErr error
crdbHandle *sql.DB
crdbStorageInstance *crdbProvider
dbConnMu sync.Mutex
)
// GetDatabase returns the database handle for the provider.
func GetDatabase() (*sql.DB, error) {
dbConnMu.Lock()
defer dbConnMu.Unlock()
return getCRDBDatabaseLocked()
}
func init() {
if err := storage.RegisterProvider(StorageProviderName, newCRDBStorageProvider); err != nil {
klog.Fatalf("Failed to register storage provider crdb: %v", err)
}
}
type crdbProvider struct {
db *sql.DB
mf monitoring.MetricFactory
}
func newCRDBStorageProvider(mf monitoring.MetricFactory) (storage.Provider, error) {
dbConnMu.Lock()
defer dbConnMu.Unlock()
if crdbStorageInstance == nil {
db, err := getCRDBDatabaseLocked()
if err != nil {
return nil, err
}
crdbStorageInstance = &crdbProvider{
db: db,
mf: mf,
}
}
return crdbStorageInstance, nil
}
// Lazy initializes the database connection handle and returns the instance.
// Requires lock to be held.
func getCRDBDatabaseLocked() (*sql.DB, error) {
if crdbHandle != nil || crdbErr != nil {
return crdbHandle, crdbErr
}
db, err := OpenDB(*crdbURI)
if err != nil {
crdbErr = err
return nil, err
}
if *maxConns > 0 {
db.SetMaxOpenConns(*maxConns)
}
if *maxIdle >= 0 {
db.SetMaxIdleConns(*maxIdle)
}
crdbHandle, crdbErr = db, nil
return db, nil
}
func (p *crdbProvider) Close() error {
return p.db.Close()
}
func (p *crdbProvider) LogStorage() storage.LogStorage {
return NewLogStorage(p.db, p.mf)
}
func (p *crdbProvider) AdminStorage() storage.AdminStorage {
return NewSQLAdminStorage(p.db)
}