mirror of
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Revert "Adding PostgreSQL Filer Support"
This reverts commit 855058858a.
This commit is contained in:
Mike Tolman
parent
855058858a
commit
a1783a14cc
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@ -1,365 +0,0 @@
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package postgres_store
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import (
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"database/sql"
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"fmt"
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"hash/crc32"
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"sync"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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_ "github.com/lib/pq"
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)
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const (
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default_maxIdleConnections = 100
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default_maxOpenConnections = 50
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default_maxTableNums = 1024
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tableName = "filer_mapping"
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)
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var (
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_init_db sync.Once
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_db_connections []*sql.DB
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)
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type PostgresConf struct {
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User string
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Password string
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HostName string
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Port int
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DataBase string
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SslMode string
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MaxIdleConnections int
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MaxOpenConnections int
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}
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type ShardingConf struct {
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IsSharding bool `json:"isSharding"`
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ShardCount int `json:"shardCount"`
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}
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type PostgresStore struct {
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dbs []*sql.DB
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isSharding bool
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shardCount int
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server string
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user string
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password string
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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(confs []PostgresConf) []*sql.DB {
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_init_db.Do(func() {
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for _, conf := range confs {
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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=60 fallback_application_name=filestore", 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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var maxIdleConnections, maxOpenConnections int
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if conf.MaxIdleConnections != 0 {
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maxIdleConnections = conf.MaxIdleConnections
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} else {
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maxIdleConnections = default_maxIdleConnections
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}
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if conf.MaxOpenConnections != 0 {
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maxOpenConnections = conf.MaxOpenConnections
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} else {
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maxOpenConnections = default_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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_db_connections = append(_db_connections, _db_connection)
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}
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})
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return _db_connections
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}
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func NewPostgresStore(confs []PostgresConf, isSharding bool, shardCount int) *PostgresStore {
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pg := &PostgresStore{
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dbs: getDbConnection(confs),
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isSharding: isSharding,
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shardCount: shardCount,
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}
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for _, db := range pg.dbs {
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if !isSharding {
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pg.shardCount = 1
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} else {
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if pg.shardCount == 0 {
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pg.shardCount = default_maxTableNums
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}
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}
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for i := 0; i < pg.shardCount; i++ {
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if err := pg.createTables(db, tableName, i); err != nil {
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fmt.Printf("create table failed %v", err)
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}
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}
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}
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return pg
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}
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func (s *PostgresStore) hash(fullFileName string) (instance_offset, table_postfix int) {
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hash_value := crc32.ChecksumIEEE([]byte(fullFileName))
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instance_offset = int(hash_value) % len(s.dbs)
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table_postfix = int(hash_value) % s.shardCount
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return
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}
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func (s *PostgresStore) parseFilerMappingInfo(path string) (instanceId int, tableFullName string, err error) {
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instance_offset, table_postfix := s.hash(path)
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instanceId = instance_offset
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if s.isSharding {
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tableFullName = fmt.Sprintf("%s_%04d", tableName, table_postfix)
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} else {
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tableFullName = tableName
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}
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return
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}
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func (s *PostgresStore) Get(fullFilePath string) (fid string, err error) {
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instance_offset, tableFullName, err := s.parseFilerMappingInfo(fullFilePath)
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if err != nil {
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return "", fmt.Errorf("PostgresStore Get operation can not parse file path %s: err is %v", fullFilePath, err)
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}
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fid, err = s.query(fullFilePath, s.dbs[instance_offset], tableFullName)
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return fid, err
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}
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func (s *PostgresStore) Put(fullFilePath string, fid string) (err error) {
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var tableFullName string
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instance_offset, tableFullName, err := s.parseFilerMappingInfo(fullFilePath)
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if err != nil {
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return fmt.Errorf("PostgresStore Put operation can not parse file path %s: err is %v", fullFilePath, err)
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}
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var old_fid string
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if old_fid, err = s.query(fullFilePath, s.dbs[instance_offset], tableFullName); err != nil && err != sql.ErrNoRows {
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return fmt.Errorf("PostgresStore Put operation failed when querying path %s: err is %v", fullFilePath, err)
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} else {
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if len(old_fid) == 0 {
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err = s.insert(fullFilePath, fid, s.dbs[instance_offset], tableFullName)
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if err != nil {
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return fmt.Errorf("PostgresStore Put operation failed when inserting path %s with fid %s : err is %v", fullFilePath, fid, err)
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}
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} else {
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err = s.update(fullFilePath, fid, s.dbs[instance_offset], tableFullName)
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if err != nil {
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return fmt.Errorf("PostgresStore Put operation failed when updating path %s with fid %s : err is %v", fullFilePath, fid, err)
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}
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}
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}
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return
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}
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func (s *PostgresStore) Delete(fullFilePath string) (err error) {
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var fid string
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instance_offset, tableFullName, err := s.parseFilerMappingInfo(fullFilePath)
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if err != nil {
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return fmt.Errorf("PostgresStore Delete operation can not parse file path %s: err is %v", fullFilePath, err)
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}
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if fid, err = s.query(fullFilePath, s.dbs[instance_offset], tableFullName); err != nil {
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return fmt.Errorf("PostgresStore Delete operation failed when querying path %s: err is %v", fullFilePath, err)
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} else if fid == "" {
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return nil
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}
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if err = s.delete(fullFilePath, s.dbs[instance_offset], tableFullName); err != nil {
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return fmt.Errorf("PostgresStore Delete operation failed when deleting path %s: err is %v", fullFilePath, err)
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} else {
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return nil
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}
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}
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func (s *PostgresStore) Close() {
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for _, db := range s.dbs {
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db.Close()
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}
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}
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var createTable = `
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CREATE TABLE IF NOT EXISTS %s (
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id BIGSERIAL NOT NULL,
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uriPath 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_index_uriPath UNIQUE (uriPath)
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);
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`
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func (s *PostgresStore) createTables(db *sql.DB, tableName string, postfix int) error {
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var realTableName string
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if s.isSharding {
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realTableName = fmt.Sprintf("%s_%04d", tableName, postfix)
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} else {
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realTableName = tableName
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}
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glog.V(3).Infoln("Creating postgres table if it doesn't exist: ", realTableName)
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sqlCreate := fmt.Sprintf(createTable, realTableName, realTableName)
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stmt, err := 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, db *sql.DB, tableName string) (string, error) {
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sqlStatement := fmt.Sprintf("SELECT fid FROM %s WHERE uriPath=$1", tableName)
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row := db.QueryRow(sqlStatement, uriPath)
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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, db *sql.DB, tableName string) error {
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sqlStatement := fmt.Sprintf("UPDATE %s SET fid=$1, updateTime=$2 WHERE uriPath=$3", tableName)
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glog.V(3).Infof("Postgres query -- updating path '%s' with id '%s'", uriPath, fid)
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res, err := db.Exec(sqlStatement, fid, time.Now().Unix(), uriPath)
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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, db *sql.DB, tableName string) error {
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sqlStatement := fmt.Sprintf("INSERT INTO %s (uriPath,fid,createTime) VALUES($1, $2, $3)", tableName)
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glog.V(3).Infof("Postgres query -- inserting path '%s' with id '%s'", uriPath, fid)
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res, err := db.Exec(sqlStatement, uriPath, 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) delete(uriPath string, db *sql.DB, tableName string) error {
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sqlStatement := fmt.Sprintf("DELETE FROM %s WHERE uriPath=$1", tableName)
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glog.V(3).Infof("Postgres query -- deleting path '%s'", uriPath)
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res, err := db.Exec(sqlStatement, uriPath)
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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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