Adding PostgreSQL Filer Support

weed/filer/postgres_store/postgres_store.go

@@ -0,0 +1,365 @@
+package postgres_store
+
+import (
+	"database/sql"
+	"fmt"
+	"hash/crc32"
+	"sync"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+
+	_ "github.com/lib/pq"
+)
+
+const (
+	default_maxIdleConnections = 100
+	default_maxOpenConnections = 50
+	default_maxTableNums       = 1024
+	tableName                  = "filer_mapping"
+)
+
+var (
+	_init_db        sync.Once
+	_db_connections []*sql.DB
+)
+
+type PostgresConf struct {
+	User               string
+	Password           string
+	HostName           string
+	Port               int
+	DataBase           string
+	SslMode     string
+	MaxIdleConnections int
+	MaxOpenConnections int
+}
+
+type ShardingConf struct {
+	IsSharding bool `json:"isSharding"`
+	ShardCount int  `json:"shardCount"`
+}
+
+type PostgresStore struct {
+	dbs []*sql.DB
+	isSharding bool
+	shardCount int
+	server string
+	user string
+	password string
+}
+
+func databaseExists(db *sql.DB, databaseName string) (bool, error) {
+	sqlStatement := "SELECT datname from pg_database WHERE datname='%s'"	
+	row := db.QueryRow(fmt.Sprintf(sqlStatement, databaseName))
+
+	var dbName string
+	err := row.Scan(&dbName)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return false, nil
+		}
+		return false, err
+	}
+	return true, nil
+}
+
+func createDatabase(db *sql.DB, databaseName string) (error) {
+	sqlStatement := "CREATE DATABASE %s ENCODING='UTF8'";
+	_, err := db.Exec(fmt.Sprintf(sqlStatement, databaseName))
+	return err
+}
+
+func getDbConnection(confs []PostgresConf) []*sql.DB {
+	_init_db.Do(func() {
+		for _, conf := range confs {
+			
+			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)						
+			glog.V(3).Infoln("Opening postgres master database")
+						
+			var dbErr error
+			_db_connection, dbErr := sql.Open("postgres", sqlUrl)
+			if dbErr != nil {
+				_db_connection.Close()
+				_db_connection = nil
+				panic(dbErr)
+			}
+			
+			pingErr := _db_connection.Ping()
+			if pingErr != nil {
+				_db_connection.Close()
+				_db_connection = nil
+				panic(pingErr)
+			}			
+			
+			glog.V(3).Infoln("Checking to see if DB exists: ", conf.DataBase)
+			var existsErr error
+			dbExists, existsErr := databaseExists(_db_connection, conf.DataBase)
+			if existsErr != nil {
+				_db_connection.Close()
+				_db_connection = nil
+				panic(existsErr)
+			}			
+			
+			if !dbExists {
+			    glog.V(3).Infoln("Database doesn't exist. Attempting to create one:  ", conf.DataBase)
+				createErr := createDatabase(_db_connection, conf.DataBase)
+				if createErr != nil {
+					_db_connection.Close()
+					_db_connection = nil
+					panic(createErr)
+				}
+			}
+
+			glog.V(3).Infoln("Closing master postgres database and opening configured database: ", conf.DataBase)
+			_db_connection.Close()
+			_db_connection = nil
+			
+			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)			
+			_db_connection, dbErr = sql.Open("postgres", sqlUrl)
+			if dbErr != nil {
+				_db_connection.Close()
+				_db_connection = nil
+				panic(dbErr)
+			}	
+
+			pingErr = _db_connection.Ping()
+			if pingErr != nil {
+				_db_connection.Close()
+				_db_connection = nil
+				panic(pingErr)
+			}
+			
+			var maxIdleConnections, maxOpenConnections int
+
+			if conf.MaxIdleConnections != 0 {
+				maxIdleConnections = conf.MaxIdleConnections
+			} else {
+				maxIdleConnections = default_maxIdleConnections
+			}
+			if conf.MaxOpenConnections != 0 {
+				maxOpenConnections = conf.MaxOpenConnections
+			} else {
+				maxOpenConnections = default_maxOpenConnections
+			}
+
+			_db_connection.SetMaxIdleConns(maxIdleConnections)
+			_db_connection.SetMaxOpenConns(maxOpenConnections)
+			_db_connections = append(_db_connections, _db_connection)
+		}
+	})
+	return _db_connections
+}
+
+func NewPostgresStore(confs []PostgresConf, isSharding bool, shardCount int) *PostgresStore {
+	pg := &PostgresStore{
+		dbs: getDbConnection(confs),
+		isSharding: isSharding,
+		shardCount: shardCount,
+	}
+
+	for _, db := range pg.dbs {
+		if !isSharding {
+			pg.shardCount = 1
+		} else {
+			if pg.shardCount == 0 {
+				pg.shardCount = default_maxTableNums
+			}
+		}
+		for i := 0; i < pg.shardCount; i++ {
+			if err := pg.createTables(db, tableName, i); err != nil {
+				fmt.Printf("create table failed %v", err)
+			}
+		}
+	}
+	
+	return pg
+}
+
+func (s *PostgresStore) hash(fullFileName string) (instance_offset, table_postfix int) {
+	hash_value := crc32.ChecksumIEEE([]byte(fullFileName))
+	instance_offset = int(hash_value) % len(s.dbs)
+	table_postfix = int(hash_value) % s.shardCount
+	return
+}
+
+func (s *PostgresStore) parseFilerMappingInfo(path string) (instanceId int, tableFullName string, err error) {
+	instance_offset, table_postfix := s.hash(path)
+	instanceId = instance_offset
+	if s.isSharding {
+		tableFullName = fmt.Sprintf("%s_%04d", tableName, table_postfix)
+	} else {
+		tableFullName = tableName
+	}
+	return
+}
+
+func (s *PostgresStore) Get(fullFilePath string) (fid string, err error) {
+	instance_offset, tableFullName, err := s.parseFilerMappingInfo(fullFilePath)
+	if err != nil {
+		return "", fmt.Errorf("PostgresStore Get operation can not parse file path %s: err is %v", fullFilePath, err)
+	}
+	fid, err = s.query(fullFilePath, s.dbs[instance_offset], tableFullName)
+		
+	return fid, err
+}
+
+func (s *PostgresStore) Put(fullFilePath string, fid string) (err error) {
+	var tableFullName string
+
+	instance_offset, tableFullName, err := s.parseFilerMappingInfo(fullFilePath)
+	if err != nil {
+		return fmt.Errorf("PostgresStore Put operation can not parse file path %s: err is %v", fullFilePath, err)
+	}
+	var old_fid string
+	if old_fid, err = s.query(fullFilePath, s.dbs[instance_offset], tableFullName); err != nil && err != sql.ErrNoRows {
+		return fmt.Errorf("PostgresStore Put operation failed when querying path %s: err is %v", fullFilePath, err)
+	} else {
+		if len(old_fid) == 0 {
+			err = s.insert(fullFilePath, fid, s.dbs[instance_offset], tableFullName)
+			if err != nil {
+				return fmt.Errorf("PostgresStore Put operation failed when inserting path %s with fid %s : err is %v", fullFilePath, fid, err)
+			}
+		} else {
+			err = s.update(fullFilePath, fid, s.dbs[instance_offset], tableFullName)
+			if err != nil {
+				return fmt.Errorf("PostgresStore Put operation failed when updating path %s with fid %s : err is %v", fullFilePath, fid, err)
+			}
+		}
+	}
+	return
+}
+
+func (s *PostgresStore) Delete(fullFilePath string) (err error) {
+	var fid string
+	instance_offset, tableFullName, err := s.parseFilerMappingInfo(fullFilePath)
+	if err != nil {
+		return fmt.Errorf("PostgresStore Delete operation can not parse file path %s: err is %v", fullFilePath, err)
+	}
+	if fid, err = s.query(fullFilePath, s.dbs[instance_offset], tableFullName); err != nil {
+		return fmt.Errorf("PostgresStore Delete operation failed when querying path %s: err is %v", fullFilePath, err)
+	} else if fid == "" {
+		return nil
+	}
+	if err = s.delete(fullFilePath, s.dbs[instance_offset], tableFullName); err != nil {
+		return fmt.Errorf("PostgresStore Delete operation failed when deleting path %s: err is %v", fullFilePath, err)
+	} else {
+		return nil
+	}
+}
+
+func (s *PostgresStore) Close() {
+	for _, db := range s.dbs {
+		db.Close()
+	}
+}
+
+var createTable = `
+
+CREATE TABLE IF NOT EXISTS %s (
+  id BIGSERIAL NOT NULL,
+  uriPath VARCHAR(1024) NOT NULL DEFAULT '',
+  fid VARCHAR(36) NOT NULL DEFAULT '',
+  createTime BIGINT NOT NULL DEFAULT 0,
+  updateTime BIGINT NOT NULL DEFAULT 0,
+  remark VARCHAR(20) NOT NULL DEFAULT '',
+  status SMALLINT NOT NULL DEFAULT '1',
+  PRIMARY KEY (id),
+  CONSTRAINT %s_index_uriPath UNIQUE (uriPath)
+);
+`
+
+func (s *PostgresStore) createTables(db *sql.DB, tableName string, postfix int) error {
+	var realTableName string
+	if s.isSharding {
+		realTableName = fmt.Sprintf("%s_%04d", tableName, postfix)
+	} else {
+		realTableName = tableName
+	}	
+			
+	glog.V(3).Infoln("Creating postgres table if it doesn't exist: ", realTableName)
+				
+	sqlCreate := fmt.Sprintf(createTable, realTableName, realTableName)
+	
+	stmt, err := db.Prepare(sqlCreate)
+	if err != nil {
+		return err
+	}
+	defer stmt.Close()
+
+	_, err = stmt.Exec()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s *PostgresStore) query(uriPath string, db *sql.DB, tableName string) (string, error) {
+	sqlStatement := fmt.Sprintf("SELECT fid FROM %s WHERE uriPath=$1", tableName)
+		
+	row := db.QueryRow(sqlStatement, uriPath)
+	var fid string
+	err := row.Scan(&fid)
+	
+	glog.V(3).Infof("Postgres query -- looking up path '%s' and found id '%s' ", uriPath, fid)
+			
+	if err != nil {
+		return "", err
+	}
+	return fid, nil
+}
+
+func (s *PostgresStore) update(uriPath string, fid string, db *sql.DB, tableName string) error {
+	sqlStatement := fmt.Sprintf("UPDATE %s SET fid=$1, updateTime=$2 WHERE uriPath=$3", tableName)
+	
+	glog.V(3).Infof("Postgres query -- updating path '%s' with id '%s'", uriPath, fid)
+	
+	res, err := db.Exec(sqlStatement, fid, time.Now().Unix(), uriPath)
+	if err != nil {
+		return err
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s *PostgresStore) insert(uriPath string, fid string, db *sql.DB, tableName string) error {
+	sqlStatement := fmt.Sprintf("INSERT INTO %s (uriPath,fid,createTime) VALUES($1, $2, $3)", tableName)
+	
+	glog.V(3).Infof("Postgres query -- inserting path '%s' with id '%s'", uriPath, fid)
+	
+	res, err := db.Exec(sqlStatement, uriPath, fid, time.Now().Unix())	
+	
+	if err != nil {
+		return err
+	}
+
+	rows, err := res.RowsAffected()	
+	if rows != 1 {
+		return fmt.Errorf("Postgres insert -- rows affected = %d. Expecting 1", rows)
+	}	
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s *PostgresStore) delete(uriPath string, db *sql.DB, tableName string) error {
+	sqlStatement := fmt.Sprintf("DELETE FROM %s WHERE uriPath=$1", tableName)
+	
+	glog.V(3).Infof("Postgres query -- deleting path '%s'", uriPath)
+	
+	res, err := db.Exec(sqlStatement, uriPath)
+	if err != nil {
+		return err
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	return nil
+}

weed/server/filer_server.go

@@ -14,6 +14,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/filer/embedded_filer"
 	"github.com/chrislusf/seaweedfs/weed/filer/flat_namespace"
 	"github.com/chrislusf/seaweedfs/weed/filer/mysql_store"
+	"github.com/chrislusf/seaweedfs/weed/filer/postgres_store"
 	"github.com/chrislusf/seaweedfs/weed/filer/redis_store"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/security"
@@ -24,6 +25,7 @@ import (
 type filerConf struct {
 	MysqlConf []mysql_store.MySqlConf `json:"mysql"`
 	mysql_store.ShardingConf
+	PostgresConf []postgres_store.PostgresConf `json:"postgres"`
 }
 
 func parseConfFile(confPath string) (*filerConf, error) {
@@ -86,6 +88,9 @@ func NewFilerServer(r *http.ServeMux, ip string, port int, master string, dir st
 	if setting.MysqlConf != nil && len(setting.MysqlConf) != 0 {
 		mysql_store := mysql_store.NewMysqlStore(setting.MysqlConf, setting.IsSharding, setting.ShardCount)
 		fs.filer = flat_namespace.NewFlatNamespaceFiler(master, mysql_store)
+	} else if setting.PostgresConf != nil && len(setting.PostgresConf) != 0 {
+		postgres_store := postgres_store.NewPostgresStore(setting.PostgresConf, setting.IsSharding, setting.ShardCount)
+		fs.filer = flat_namespace.NewFlatNamespaceFiler(master, postgres_store)
 	} else if cassandra_server != "" {
 		cassandra_store, err := cassandra_store.NewCassandraStore(cassandra_keyspace, cassandra_server)
 		if err != nil {