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https://github.com/minio/minio.git
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make notification as separate package (#5294)
* Remove old notification files * Add net package * Add event package * Modify minio to take new notification system
This commit is contained in:
Bala FA
kannappanr
226
pkg/event/target/mysql.go
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226
pkg/event/target/mysql.go
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/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// MySQL Notifier implementation. Two formats, "namespace" and
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// "access" are supported.
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//
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// * Namespace format
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//
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// On each create or update object event in Minio Object storage
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// server, a row is created or updated in the table in MySQL. On each
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// object removal, the corresponding row is deleted from the table.
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//
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// A table with a specific structure (column names, column types, and
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// primary key/uniqueness constraint) is used. The user may set the
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// table name in the configuration. A sample SQL command that creates
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// a command with the required structure is:
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//
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// CREATE TABLE myminio (
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// key_name VARCHAR(2048),
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// value JSONB,
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// PRIMARY KEY (key_name),
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// );
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//
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// MySQL's "INSERT ... ON DUPLICATE ..." feature (UPSERT) is used
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// here. The implementation has been tested with MySQL Ver 14.14
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// Distrib 5.7.17.
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//
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// * Access format
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//
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// On each event, a row is appended to the configured table. There is
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// no deletion or modification of existing rows.
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//
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// A different table schema is used for this format. A sample SQL
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// commant that creates a table with the required structure is:
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//
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// CREATE TABLE myminio (
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// event_time TIMESTAMP WITH TIME ZONE NOT NULL,
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// event_data JSONB
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// );
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package target
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import (
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"database/sql"
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"encoding/json"
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"fmt"
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"net/url"
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"time"
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"github.com/go-sql-driver/mysql"
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"github.com/minio/minio/pkg/event"
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xnet "github.com/minio/minio/pkg/net"
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)
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const (
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mysqlTableExists = `SELECT 1 FROM %s;`
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mysqlCreateNamespaceTable = `CREATE TABLE %s (key_name VARCHAR(2048), value JSON, PRIMARY KEY (key_name));`
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mysqlCreateAccessTable = `CREATE TABLE %s (event_time DATETIME NOT NULL, event_data JSON);`
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mysqlUpdateRow = `INSERT INTO %s (key_name, value) VALUES (?, ?) ON DUPLICATE KEY UPDATE value=VALUES(value);`
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mysqlDeleteRow = `DELETE FROM %s WHERE key_name = ?;`
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mysqlInsertRow = `INSERT INTO %s (event_time, event_data) VALUES (?, ?);`
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)
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// MySQLArgs - MySQL target arguments.
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type MySQLArgs struct {
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Enable bool `json:"enable"`
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Format string `json:"format"`
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DSN string `json:"dsnString"`
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Table string `json:"table"`
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Host xnet.URL `json:"host"`
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Port string `json:"port"`
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User string `json:"user"`
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Password string `json:"password"`
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Database string `json:"database"`
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}
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// MySQLTarget - MySQL target.
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type MySQLTarget struct {
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id event.TargetID
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args MySQLArgs
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updateStmt *sql.Stmt
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deleteStmt *sql.Stmt
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insertStmt *sql.Stmt
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db *sql.DB
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}
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// ID - returns target ID.
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func (target *MySQLTarget) ID() event.TargetID {
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return target.id
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}
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// Send - sends event to MySQL.
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func (target *MySQLTarget) Send(eventData event.Event) error {
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if target.args.Format == event.NamespaceFormat {
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objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
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if err != nil {
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return err
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}
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key := eventData.S3.Bucket.Name + "/" + objectName
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if eventData.EventName == event.ObjectRemovedDelete {
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_, err = target.deleteStmt.Exec(key)
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} else {
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var data []byte
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if data, err = json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}}); err != nil {
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return err
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}
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_, err = target.updateStmt.Exec(key, data)
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}
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return err
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}
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if target.args.Format == event.AccessFormat {
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eventTime, err := time.Parse(event.AMZTimeFormat, eventData.EventTime)
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if err != nil {
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return err
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}
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data, err := json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}})
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if err != nil {
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return err
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}
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_, err = target.insertStmt.Exec(eventTime, data)
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return err
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}
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return nil
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}
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// Close - closes underneath connections to MySQL database.
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func (target *MySQLTarget) Close() error {
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if target.updateStmt != nil {
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// FIXME: log returned error. ignore time being.
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_ = target.updateStmt.Close()
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}
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if target.deleteStmt != nil {
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// FIXME: log returned error. ignore time being.
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_ = target.deleteStmt.Close()
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}
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if target.insertStmt != nil {
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// FIXME: log returned error. ignore time being.
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_ = target.insertStmt.Close()
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}
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return target.db.Close()
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}
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// NewMySQLTarget - creates new MySQL target.
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func NewMySQLTarget(id string, args MySQLArgs) (*MySQLTarget, error) {
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if args.DSN == "" {
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config := mysql.Config{
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User: args.User,
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Passwd: args.Password,
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Net: "tcp",
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Addr: args.Host.String() + ":" + args.Port,
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DBName: args.Database,
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}
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args.DSN = config.FormatDSN()
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}
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db, err := sql.Open("mysql", args.DSN)
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if err != nil {
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return nil, err
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}
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if err = db.Ping(); err != nil {
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return nil, err
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}
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if _, err = db.Exec(fmt.Sprintf(mysqlTableExists, args.Table)); err != nil {
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createStmt := mysqlCreateNamespaceTable
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if args.Format == event.AccessFormat {
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createStmt = mysqlCreateAccessTable
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}
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if _, err = db.Exec(fmt.Sprintf(createStmt, args.Table)); err != nil {
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return nil, err
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}
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}
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var updateStmt, deleteStmt, insertStmt *sql.Stmt
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switch args.Format {
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case event.NamespaceFormat:
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// insert or update statement
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if updateStmt, err = db.Prepare(fmt.Sprintf(mysqlUpdateRow, args.Table)); err != nil {
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return nil, err
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}
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// delete statement
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if deleteStmt, err = db.Prepare(fmt.Sprintf(mysqlDeleteRow, args.Table)); err != nil {
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return nil, err
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}
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case event.AccessFormat:
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// insert statement
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if insertStmt, err = db.Prepare(fmt.Sprintf(mysqlInsertRow, args.Table)); err != nil {
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return nil, err
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}
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}
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return &MySQLTarget{
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id: event.TargetID{id, "mysql"},
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args: args,
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updateStmt: updateStmt,
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deleteStmt: deleteStmt,
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insertStmt: insertStmt,
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db: db,
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}, nil
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}
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