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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
233
pkg/event/target/postgresql.go
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233
pkg/event/target/postgresql.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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// PostgreSQL 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 Postgres. On
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// each object removal, the corresponding row is deleted from the
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// 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 table with the required structure is:
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//
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// CREATE TABLE myminio (
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// key VARCHAR PRIMARY KEY,
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// value JSONB
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// );
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//
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// PostgreSQL's "INSERT ... ON CONFLICT ... DO UPDATE ..." feature
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// (UPSERT) is used here, so the minimum version of PostgreSQL
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// required is 9.5.
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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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"strings"
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"time"
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_ "github.com/lib/pq" // Register postgres driver
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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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psqlTableExists = `SELECT 1 FROM %s;`
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psqlCreateNamespaceTable = `CREATE TABLE %s (key VARCHAR PRIMARY KEY, value JSONB);`
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psqlCreateAccessTable = `CREATE TABLE %s (event_time TIMESTAMP WITH TIME ZONE NOT NULL, event_data JSONB);`
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psqlUpdateRow = `INSERT INTO %s (key, value) VALUES ($1, $2) ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value;`
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psqlDeleteRow = `DELETE FROM %s WHERE key = $1;`
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psqlInsertRow = `INSERT INTO %s (event_time, event_data) VALUES ($1, $2);`
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)
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// PostgreSQLArgs - PostgreSQL target arguments.
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type PostgreSQLArgs struct {
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Enable bool `json:"enable"`
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Format string `json:"format"`
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ConnectionString string `json:"connectionString"`
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Table string `json:"table"`
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Host xnet.URL `json:"host"` // default: localhost
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Port string `json:"port"` // default: 5432
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User string `json:"user"` // default: user running minio
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Password string `json:"password"` // default: no password
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Database string `json:"database"` // default: same as user
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}
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// PostgreSQLTarget - PostgreSQL target.
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type PostgreSQLTarget struct {
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id event.TargetID
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args PostgreSQLArgs
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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 *PostgreSQLTarget) ID() event.TargetID {
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return target.id
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}
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// Send - sends event to PostgreSQL.
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func (target *PostgreSQLTarget) 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 PostgreSQL database.
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func (target *PostgreSQLTarget) 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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// NewPostgreSQLTarget - creates new PostgreSQL target.
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func NewPostgreSQLTarget(id string, args PostgreSQLArgs) (*PostgreSQLTarget, error) {
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params := []string{args.ConnectionString}
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if !args.Host.IsEmpty() {
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params = append(params, "host="+args.Host.String())
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}
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if args.Port != "" {
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params = append(params, "port="+args.Port)
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}
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if args.User != "" {
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params = append(params, "user="+args.User)
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}
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if args.Password != "" {
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params = append(params, "password="+args.Password)
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}
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if args.Database != "" {
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params = append(params, "dbname="+args.Database)
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}
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connStr := strings.Join(params, " ")
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db, err := sql.Open("postgres", connStr)
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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(psqlTableExists, args.Table)); err != nil {
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createStmt := psqlCreateNamespaceTable
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if args.Format == event.AccessFormat {
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createStmt = psqlCreateAccessTable
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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(psqlUpdateRow, 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(psqlDeleteRow, 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(psqlInsertRow, args.Table)); err != nil {
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return nil, err
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}
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}
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return &PostgreSQLTarget{
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id: event.TargetID{id, "postgresql"},
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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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