/
db.go
167 lines (122 loc) · 3.39 KB
/
db.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
package direktiv
import (
"context"
"database/sql"
"fmt"
"time"
"github.com/lib/pq"
"github.com/vorteil/direktiv/ent"
"github.com/vorteil/direktiv/ent/hook"
secretsgrpc "github.com/vorteil/direktiv/pkg/secrets/grpc"
"github.com/vorteil/direktiv/pkg/util"
"github.com/vorteil/direktiv/pkg/varstore"
"google.golang.org/grpc"
)
const (
filterPrefix = "filter-"
)
// DBManager contains all database related information and functions
type dbManager struct {
dbEnt *ent.Client
ctx context.Context
tm *timerManager
varStorage *varstore.VarStorage
grpcConn *grpc.ClientConn
secretsClient secretsgrpc.SecretsServiceClient
dbForLock *sql.DB
}
func prepLockDB(conn string) (*sql.DB, error) {
db, err := sql.Open("postgres", conn)
db.SetConnMaxIdleTime(-1)
db.SetConnMaxLifetime(-1)
db.SetMaxOpenConns(10)
db.SetMaxIdleConns(10)
return db, err
}
func newDBManager(ctx context.Context, conn string, config *Config) (*dbManager, error) {
var err error
db := &dbManager{
ctx: ctx,
}
appLog.Debugf("connecting db")
db.dbEnt, err = ent.Open("postgres", conn)
if err != nil {
appLog.Errorf("can not connect to db: %v", err)
return nil, err
}
udb := db.dbEnt.DB()
udb.SetMaxIdleConns(64)
udb.SetMaxOpenConns(32)
// Run the auto migration tool.
if err := db.dbEnt.Schema.Create(db.ctx); err != nil {
appLog.Errorf("failed creating schema resources: %v", err)
return nil, err
}
// increasing the version of the workflow by one
// can be used to lookup which workflow uses which revision
db.dbEnt.Workflow.Use(func(next ent.Mutator) ent.Mutator {
return hook.WorkflowFunc(func(ctx context.Context, m *ent.WorkflowMutation) (ent.Value, error) {
m.AddRevision(1)
return next.Mutate(ctx, m)
})
})
// get secrets client
db.grpcConn, err = util.GetEndpointTLS(util.TLSSecretsComponent)
if err != nil {
return nil, err
}
db.secretsClient = secretsgrpc.NewSecretsServiceClient(db.grpcConn)
db.dbForLock, err = prepLockDB(conn)
if err != nil {
return nil, err
}
return db, nil
}
func rollback(tx *ent.Tx, err error) error {
if rerr := tx.Rollback(); rerr != nil {
err = fmt.Errorf("%v: %v", err, rerr)
}
return err
}
func (db *dbManager) tryLockDB(id uint64) (bool, *sql.Conn, error) {
var gotLock bool
conn, err := db.dbForLock.Conn(context.Background())
if err != nil {
return false, nil, err
}
conn.QueryRowContext(context.Background(), "SELECT pg_try_advisory_lock($1)", int64(id)).Scan(&gotLock)
if !gotLock {
conn.Close()
}
return gotLock, conn, nil
}
func (db *dbManager) lockDB(id uint64, wait int) (*sql.Conn, error) {
var err error
ctx, cancel := context.WithTimeout(context.Background(),
time.Duration(wait)*time.Second)
defer cancel()
conn, err := db.dbForLock.Conn(ctx)
if err != nil {
return nil, err
}
_, err = conn.ExecContext(ctx, "SELECT pg_advisory_lock($1)", int64(id))
if err, ok := err.(*pq.Error); ok {
appLog.Debugf("db lock failed: %v", err)
if err.Code == "57014" {
return conn, fmt.Errorf("canceled query")
}
return conn, err
}
return conn, err
}
func (db *dbManager) unlockDB(id uint64, conn *sql.Conn) {
_, err := conn.ExecContext(context.Background(),
"SELECT pg_advisory_unlock($1)", int64(id))
if err != nil {
appLog.Errorf("can not unlock lock %d: %v", id, err)
}
err = conn.Close()
if err != nil {
appLog.Errorf("can not close database connection %d: %v", id, err)
}
}