Repository navigation
Expand file tree
/
Copy pathpostgresql.go
More file actions
269 lines (238 loc) · 7.43 KB
/
Copy pathpostgresql.go
File metadata and controls
269 lines (238 loc) · 7.43 KB
Edit and raw actions
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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
/*
* Minio Cloud Storage, (C) 2018 Minio, 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.
*/
// PostgreSQL Notifier implementation. Two formats, "namespace" and
// "access" are supported.
//
// * Namespace format
//
// On each create or update object event in Minio Object storage
// server, a row is created or updated in the table in Postgres. On
// each object removal, the corresponding row is deleted from the
// table.
//
// A table with a specific structure (column names, column types, and
// primary key/uniqueness constraint) is used. The user may set the
// table name in the configuration. A sample SQL command that creates
// a table with the required structure is:
//
// CREATE TABLE myminio (
// key VARCHAR PRIMARY KEY,
// value JSONB
// );
//
// PostgreSQL's "INSERT ... ON CONFLICT ... DO UPDATE ..." feature
// (UPSERT) is used here, so the minimum version of PostgreSQL
// required is 9.5.
//
// * Access format
//
// On each event, a row is appended to the configured table. There is
// no deletion or modification of existing rows.
//
// A different table schema is used for this format. A sample SQL
// commant that creates a table with the required structure is:
//
// CREATE TABLE myminio (
// event_time TIMESTAMP WITH TIME ZONE NOT NULL,
// event_data JSONB
// );
package target
import (
"database/sql"
"encoding/json"
"fmt"
"net/url"
"strconv"
"strings"
"time"
_ "github.com/lib/pq" // Register postgres driver
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
)
const (
psqlTableExists = `SELECT 1 FROM %s;`
psqlCreateNamespaceTable = `CREATE TABLE %s (key VARCHAR PRIMARY KEY, value JSONB);`
psqlCreateAccessTable = `CREATE TABLE %s (event_time TIMESTAMP WITH TIME ZONE NOT NULL, event_data JSONB);`
psqlUpdateRow = `INSERT INTO %s (key, value) VALUES ($1, $2) ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value;`
psqlDeleteRow = `DELETE FROM %s WHERE key = $1;`
psqlInsertRow = `INSERT INTO %s (event_time, event_data) VALUES ($1, $2);`
)
// PostgreSQLArgs - PostgreSQL target arguments.
type PostgreSQLArgs struct {
Enable bool `json:"enable"`
Format string `json:"format"`
ConnectionString string `json:"connectionString"`
Table string `json:"table"`
Host xnet.URL `json:"host"` // default: localhost
Port string `json:"port"` // default: 5432
User string `json:"user"` // default: user running minio
Password string `json:"password"` // default: no password
Database string `json:"database"` // default: same as user
}
// Validate PostgreSQLArgs fields
func (p PostgreSQLArgs) Validate() error {
if !p.Enable {
return nil
}
if p.Table == "" {
return fmt.Errorf("empty table name")
}
if p.Format != "" {
f := strings.ToLower(p.Format)
if f != event.NamespaceFormat && f != event.AccessFormat {
return fmt.Errorf("unrecognized format value")
}
}
if p.ConnectionString != "" {
// No pq API doesn't help to validate connection string
// prior connection, so no validation for now.
} else {
// Some fields need to be specified when ConnectionString is unspecified
if p.Port == "" {
return fmt.Errorf("unspecified port")
}
if _, err := strconv.Atoi(p.Port); err != nil {
return fmt.Errorf("invalid port")
}
if p.Database == "" {
return fmt.Errorf("database unspecified")
}
}
return nil
}
// PostgreSQLTarget - PostgreSQL target.
type PostgreSQLTarget struct {
id event.TargetID
args PostgreSQLArgs
updateStmt *sql.Stmt
deleteStmt *sql.Stmt
insertStmt *sql.Stmt
db *sql.DB
}
// ID - returns target ID.
func (target *PostgreSQLTarget) ID() event.TargetID {
return target.id
}
// Send - sends event to PostgreSQL.
func (target *PostgreSQLTarget) Send(eventData event.Event) error {
if target.args.Format == event.NamespaceFormat {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return err
}
key := eventData.S3.Bucket.Name + "/" + objectName
if eventData.EventName == event.ObjectRemovedDelete {
_, err = target.deleteStmt.Exec(key)
} else {
var data []byte
if data, err = json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}}); err != nil {
return err
}
_, err = target.updateStmt.Exec(key, data)
}
return err
}
if target.args.Format == event.AccessFormat {
eventTime, err := time.Parse(event.AMZTimeFormat, eventData.EventTime)
if err != nil {
return err
}
data, err := json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}})
if err != nil {
return err
}
_, err = target.insertStmt.Exec(eventTime, data)
return err
}
return nil
}
// Close - closes underneath connections to PostgreSQL database.
func (target *PostgreSQLTarget) Close() error {
if target.updateStmt != nil {
// FIXME: log returned error. ignore time being.
_ = target.updateStmt.Close()
}
if target.deleteStmt != nil {
// FIXME: log returned error. ignore time being.
_ = target.deleteStmt.Close()
}
if target.insertStmt != nil {
// FIXME: log returned error. ignore time being.
_ = target.insertStmt.Close()
}
return target.db.Close()
}
// NewPostgreSQLTarget - creates new PostgreSQL target.
func NewPostgreSQLTarget(id string, args PostgreSQLArgs) (*PostgreSQLTarget, error) {
params := []string{args.ConnectionString}
if !args.Host.IsEmpty() {
params = append(params, "host="+args.Host.String())
}
if args.Port != "" {
params = append(params, "port="+args.Port)
}
if args.User != "" {
params = append(params, "user="+args.User)
}
if args.Password != "" {
params = append(params, "password="+args.Password)
}
if args.Database != "" {
params = append(params, "dbname="+args.Database)
}
connStr := strings.Join(params, " ")
db, err := sql.Open("postgres", connStr)
if err != nil {
return nil, err
}
if err = db.Ping(); err != nil {
return nil, err
}
if _, err = db.Exec(fmt.Sprintf(psqlTableExists, args.Table)); err != nil {
createStmt := psqlCreateNamespaceTable
if args.Format == event.AccessFormat {
createStmt = psqlCreateAccessTable
}
if _, err = db.Exec(fmt.Sprintf(createStmt, args.Table)); err != nil {
return nil, err
}
}
var updateStmt, deleteStmt, insertStmt *sql.Stmt
switch args.Format {
case event.NamespaceFormat:
// insert or update statement
if updateStmt, err = db.Prepare(fmt.Sprintf(psqlUpdateRow, args.Table)); err != nil {
return nil, err
}
// delete statement
if deleteStmt, err = db.Prepare(fmt.Sprintf(psqlDeleteRow, args.Table)); err != nil {
return nil, err
}
case event.AccessFormat:
// insert statement
if insertStmt, err = db.Prepare(fmt.Sprintf(psqlInsertRow, args.Table)); err != nil {
return nil, err
}
}
return &PostgreSQLTarget{
id: event.TargetID{ID: id, Name: "postgresql"},
args: args,
updateStmt: updateStmt,
deleteStmt: deleteStmt,
insertStmt: insertStmt,
db: db,
}, nil
}