mirror of
https://github.com/seaweedfs/seaweedfs.git
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455 lines
13 KiB
Go
455 lines
13 KiB
Go
package postgres_store
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import (
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"database/sql"
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"fmt"
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"path/filepath"
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"time"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/glog"
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_ "github.com/lib/pq"
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_ "path/filepath"
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"strings"
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)
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func databaseExists(db *sql.DB, databaseName string) (bool, error) {
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sqlStatement := "SELECT datname from pg_database WHERE datname='%s'"
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row := db.QueryRow(fmt.Sprintf(sqlStatement, databaseName))
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var dbName string
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err := row.Scan(&dbName)
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if err != nil {
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if err == sql.ErrNoRows {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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func createDatabase(db *sql.DB, databaseName string) error {
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sqlStatement := "CREATE DATABASE %s ENCODING='UTF8'"
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_, err := db.Exec(fmt.Sprintf(sqlStatement, databaseName))
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return err
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}
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func getDbConnection(conf PostgresConf) *sql.DB {
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_init_db.Do(func() {
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sqlUrl := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=%s connect_timeout=30", conf.HostName, conf.Port, conf.User, conf.Password, "postgres", conf.SslMode)
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glog.V(3).Infoln("Opening postgres master database")
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var dbErr error
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_db_connection, dbErr := sql.Open("postgres", sqlUrl)
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if dbErr != nil {
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_db_connection.Close()
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_db_connection = nil
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panic(dbErr)
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}
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pingErr := _db_connection.Ping()
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if pingErr != nil {
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_db_connection.Close()
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_db_connection = nil
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panic(pingErr)
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}
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glog.V(3).Infoln("Checking to see if DB exists: ", conf.DataBase)
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var existsErr error
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dbExists, existsErr := databaseExists(_db_connection, conf.DataBase)
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if existsErr != nil {
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_db_connection.Close()
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_db_connection = nil
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panic(existsErr)
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}
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if !dbExists {
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glog.V(3).Infoln("Database doesn't exist. Attempting to create one: ", conf.DataBase)
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createErr := createDatabase(_db_connection, conf.DataBase)
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if createErr != nil {
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_db_connection.Close()
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_db_connection = nil
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panic(createErr)
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}
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}
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glog.V(3).Infoln("Closing master postgres database and opening configured database: ", conf.DataBase)
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_db_connection.Close()
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_db_connection = nil
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sqlUrl = fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=%s connect_timeout=30", conf.HostName, conf.Port, conf.User, conf.Password, conf.DataBase, conf.SslMode)
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_db_connection, dbErr = sql.Open("postgres", sqlUrl)
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if dbErr != nil {
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_db_connection.Close()
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_db_connection = nil
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panic(dbErr)
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}
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pingErr = _db_connection.Ping()
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if pingErr != nil {
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_db_connection.Close()
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_db_connection = nil
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panic(pingErr)
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}
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maxIdleConnections, maxOpenConnections := default_maxIdleConnections, default_maxOpenConnections
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if conf.MaxIdleConnections != 0 {
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maxIdleConnections = conf.MaxIdleConnections
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}
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if conf.MaxOpenConnections != 0 {
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maxOpenConnections = conf.MaxOpenConnections
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}
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_db_connection.SetMaxIdleConns(maxIdleConnections)
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_db_connection.SetMaxOpenConns(maxOpenConnections)
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})
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return _db_connection
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}
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var createDirectoryTable = `
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CREATE TABLE IF NOT EXISTS %s (
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id BIGSERIAL NOT NULL,
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directoryRoot VARCHAR(1024) NOT NULL DEFAULT '',
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directoryName VARCHAR(1024) NOT NULL DEFAULT '',
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CONSTRAINT unique_directory UNIQUE (directoryRoot, directoryName)
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);
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`
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var createFileTable = `
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CREATE TABLE IF NOT EXISTS %s (
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id BIGSERIAL NOT NULL,
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directoryPart VARCHAR(1024) NOT NULL DEFAULT '',
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filePart VARCHAR(1024) NOT NULL DEFAULT '',
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fid VARCHAR(36) NOT NULL DEFAULT '',
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createTime BIGINT NOT NULL DEFAULT 0,
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updateTime BIGINT NOT NULL DEFAULT 0,
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remark VARCHAR(20) NOT NULL DEFAULT '',
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status SMALLINT NOT NULL DEFAULT '1',
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PRIMARY KEY (id),
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CONSTRAINT %s_unique_file UNIQUE (directoryPart, filePart)
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);
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`
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func (s *PostgresStore) createDirectoriesTable() error {
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glog.V(3).Infoln("Creating postgres table if it doesn't exist: ", directoriesTableName)
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sqlCreate := fmt.Sprintf(createDirectoryTable, directoriesTableName)
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stmt, err := s.db.Prepare(sqlCreate)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec()
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if err != nil {
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return err
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}
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return nil
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}
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func (s *PostgresStore) createFilesTable() error {
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glog.V(3).Infoln("Creating postgres table if it doesn't exist: ", filesTableName)
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sqlCreate := fmt.Sprintf(createFileTable, filesTableName, filesTableName)
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stmt, err := s.db.Prepare(sqlCreate)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec()
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if err != nil {
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return err
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}
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return nil
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}
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func (s *PostgresStore) query(uriPath string) (string, error) {
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directoryPart, filePart := filepath.Split(uriPath)
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sqlStatement := fmt.Sprintf("SELECT fid FROM %s WHERE directoryPart=$1 AND filePart=$2", filesTableName)
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row := s.db.QueryRow(sqlStatement, directoryPart, filePart)
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var fid string
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err := row.Scan(&fid)
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glog.V(3).Infof("Postgres query -- looking up path '%s' and found id '%s' ", uriPath, fid)
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if err != nil {
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return "", err
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}
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return fid, nil
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}
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func (s *PostgresStore) update(uriPath string, fid string) error {
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directoryPart, filePart := filepath.Split(uriPath)
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sqlStatement := fmt.Sprintf("UPDATE %s SET fid=$1, updateTime=$2 WHERE directoryPart=$3 AND filePart=$4", filesTableName)
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glog.V(3).Infof("Postgres query -- updating path '%s' with id '%s'", uriPath, fid)
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res, err := s.db.Exec(sqlStatement, fid, time.Now().Unix(), directoryPart, filePart)
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if err != nil {
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return err
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}
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_, err = res.RowsAffected()
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if err != nil {
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return err
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}
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return nil
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}
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func (s *PostgresStore) insert(uriPath string, fid string) error {
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directoryPart, filePart := filepath.Split(uriPath)
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existingId, _, _ := s.lookupDirectory(directoryPart)
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if existingId == 0 {
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s.recursiveInsertDirectory(directoryPart)
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}
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sqlStatement := fmt.Sprintf("INSERT INTO %s (directoryPart,filePart,fid,createTime) VALUES($1, $2, $3, $4)", filesTableName)
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glog.V(3).Infof("Postgres query -- inserting path '%s' with id '%s'", uriPath, fid)
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res, err := s.db.Exec(sqlStatement, directoryPart, filePart, fid, time.Now().Unix())
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if err != nil {
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return err
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}
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rows, err := res.RowsAffected()
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if rows != 1 {
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return fmt.Errorf("Postgres insert -- rows affected = %d. Expecting 1", rows)
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}
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if err != nil {
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return err
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}
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return nil
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}
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func (s *PostgresStore) recursiveInsertDirectory(dirPath string) {
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pathParts := strings.Split(dirPath, "/")
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var workingPath string = "/"
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for _, part := range pathParts {
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if part == "" {
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continue
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}
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workingPath += (part + "/")
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existingId, _, _ := s.lookupDirectory(workingPath)
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if existingId == 0 {
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s.insertDirectory(workingPath)
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}
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}
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}
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func (s *PostgresStore) insertDirectory(dirPath string) {
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pathParts := strings.Split(dirPath, "/")
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directoryRoot := "/"
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directoryName := ""
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if len(pathParts) > 1 {
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directoryRoot = strings.Join(pathParts[0:len(pathParts)-2], "/") + "/"
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directoryName = strings.Join(pathParts[len(pathParts)-2:], "/")
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} else if len(pathParts) == 1 {
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directoryRoot = "/"
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directoryName = pathParts[0] + "/"
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}
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sqlInsertDirectoryStatement := fmt.Sprintf("INSERT INTO %s (directoryroot, directoryname) "+
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"SELECT $1, $2 WHERE NOT EXISTS ( SELECT id FROM %s WHERE directoryroot=$3 AND directoryname=$4 )",
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directoriesTableName, directoriesTableName)
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glog.V(4).Infof("Postgres query -- Inserting directory (if it doesn't exist) - root = %s, name = %s",
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directoryRoot, directoryName)
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_, err := s.db.Exec(sqlInsertDirectoryStatement, directoryRoot, directoryName, directoryRoot, directoryName)
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if err != nil {
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glog.V(0).Infof("Postgres query -- Error inserting directory - root = %s, name = %s: %s",
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directoryRoot, directoryName, err)
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}
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}
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func (s *PostgresStore) delete(uriPath string) error {
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directoryPart, filePart := filepath.Split(uriPath)
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sqlStatement := fmt.Sprintf("DELETE FROM %s WHERE directoryPart=$1 AND filePart=$2", filesTableName)
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glog.V(3).Infof("Postgres query -- deleting path '%s'", uriPath)
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res, err := s.db.Exec(sqlStatement, directoryPart, filePart)
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if err != nil {
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return err
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}
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_, err = res.RowsAffected()
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if err != nil {
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return err
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}
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return nil
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}
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func (s *PostgresStore) lookupDirectory(dirPath string) (filer.DirectoryId, string, error) {
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directoryRoot, directoryName := s.mySplitPath(dirPath)
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sqlStatement := fmt.Sprintf("SELECT id, directoryroot, directoryname FROM %s WHERE directoryRoot=$1 AND directoryName=$2", directoriesTableName)
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row := s.db.QueryRow(sqlStatement, directoryRoot, directoryName)
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var id filer.DirectoryId
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var dirRoot string
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var dirName string
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err := row.Scan(&id, &dirRoot, &dirName)
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glog.V(3).Infof("Postgres lookupDirectory -- looking up directory '%s' and found id '%d', root '%s', name '%s' ", dirPath, id, dirRoot, dirName)
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if err != nil {
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return 0, "", err
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}
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return id, filepath.Join(dirRoot, dirName), err
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}
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func (s *PostgresStore) findDirectories(dirPath string, limit int) (dirs []filer.DirectoryEntry, err error) {
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sqlStatement := fmt.Sprintf("SELECT id, directoryroot, directoryname FROM %s WHERE directoryRoot=$1 AND directoryName != '' ORDER BY id LIMIT $2", directoriesTableName)
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rows, err := s.db.Query(sqlStatement, dirPath, limit)
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if err != nil {
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glog.V(0).Infof("Postgres findDirectories error: %s", err)
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}
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if rows != nil {
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defer rows.Close()
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for rows.Next() {
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var id filer.DirectoryId
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var directoryRoot string
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var directoryName string
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scanErr := rows.Scan(&id, &directoryRoot, &directoryName)
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if scanErr != nil {
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err = scanErr
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}
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dirs = append(dirs, filer.DirectoryEntry{Name: (directoryName), Id: id})
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}
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}
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return
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}
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func (s *PostgresStore) safeToDeleteDirectory(dirPath string, recursive bool) bool {
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if recursive {
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return true
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}
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sqlStatement := fmt.Sprintf("SELECT id FROM %s WHERE directoryRoot LIKE $1 LIMIT 1", directoriesTableName)
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row := s.db.QueryRow(sqlStatement, dirPath+"%")
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var id filer.DirectoryId
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err := row.Scan(&id)
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if err != nil {
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if err == sql.ErrNoRows {
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return true
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}
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}
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return false
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}
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func (s *PostgresStore) mySplitPath(dirPath string) (directoryRoot string, directoryName string) {
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pathParts := strings.Split(dirPath, "/")
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directoryRoot = "/"
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directoryName = ""
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if len(pathParts) > 1 {
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directoryRoot = strings.Join(pathParts[0:len(pathParts)-2], "/") + "/"
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directoryName = strings.Join(pathParts[len(pathParts)-2:], "/")
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} else if len(pathParts) == 1 {
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directoryRoot = "/"
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directoryName = pathParts[0] + "/"
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}
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return directoryRoot, directoryName
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}
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func (s *PostgresStore) deleteDirectory(dirPath string, recursive bool) (err error) {
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directoryRoot, directoryName := s.mySplitPath(dirPath)
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// delete files
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sqlStatement := fmt.Sprintf("DELETE FROM %s WHERE directorypart=$1", filesTableName)
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_, err = s.db.Exec(sqlStatement, dirPath)
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if err != nil {
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return err
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}
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// delete specific directory if it is empty or recursive delete was requested
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safeToDelete := s.safeToDeleteDirectory(dirPath, recursive)
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if safeToDelete {
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sqlStatement = fmt.Sprintf("DELETE FROM %s WHERE directoryRoot=$1 AND directoryName=$2", directoriesTableName)
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_, err = s.db.Exec(sqlStatement, directoryRoot, directoryName)
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if err != nil {
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return err
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}
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}
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if recursive {
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// delete descendant files
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sqlStatement = fmt.Sprintf("DELETE FROM %s WHERE directorypart LIKE $1", filesTableName)
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_, err = s.db.Exec(sqlStatement, dirPath+"%")
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if err != nil {
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return err
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}
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// delete descendant directories
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sqlStatement = fmt.Sprintf("DELETE FROM %s WHERE directoryRoot LIKE $1", directoriesTableName)
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_, err = s.db.Exec(sqlStatement, dirPath+"%")
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if err != nil {
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return err
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}
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}
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return err
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}
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func (s *PostgresStore) findFiles(dirPath string, lastFileName string, limit int) (files []filer.FileEntry, err error) {
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var rows *sql.Rows = nil
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if lastFileName == "" {
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sqlStatement :=
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fmt.Sprintf("SELECT fid, directorypart, filepart FROM %s WHERE directorypart=$1 ORDER BY id LIMIT $2", filesTableName)
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rows, err = s.db.Query(sqlStatement, dirPath, limit)
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} else {
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sqlStatement :=
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fmt.Sprintf("SELECT fid, directorypart, filepart FROM %s WHERE directorypart=$1 "+
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"AND id > (SELECT id FROM %s WHERE directoryPart=$2 AND filepart=$3) ORDER BY id LIMIT $4",
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filesTableName, filesTableName)
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_, lastFileNameName := filepath.Split(lastFileName)
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rows, err = s.db.Query(sqlStatement, dirPath, dirPath, lastFileNameName, limit)
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}
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if err != nil {
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glog.V(0).Infof("Postgres find files error: %s", err)
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}
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if rows != nil {
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defer rows.Close()
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for rows.Next() {
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var fid filer.FileId
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var directoryPart string
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var filePart string
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scanErr := rows.Scan(&fid, &directoryPart, &filePart)
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if scanErr != nil {
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err = scanErr
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}
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files = append(files, filer.FileEntry{Name: filepath.Join(directoryPart, filePart), Id: fid})
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if len(files) >= limit {
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break
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}
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}
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}
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glog.V(3).Infof("Postgres findFiles -- looking up files under '%s' and found %d files. Limit=%d, lastFileName=%s",
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dirPath, len(files), limit, lastFileName)
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return files, err
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}
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