seaweedfs/weed/filer2/postgres/postgres_store.go

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package postgres
import (
"database/sql"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/filer2/abstract_sql"
"github.com/chrislusf/seaweedfs/weed/util"
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_ "github.com/lib/pq"
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)
const (
CONNECTION_URL_PATTERN = "host=%s port=%d user=%s sslmode=%s connect_timeout=30"
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)
func init() {
filer2.Stores = append(filer2.Stores, &PostgresStore{})
}
type PostgresStore struct {
abstract_sql.AbstractSqlStore
}
func (store *PostgresStore) GetName() string {
return "postgres"
}
func (store *PostgresStore) Initialize(configuration util.Configuration, prefix string) (err error) {
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return store.initialize(
configuration.GetString(prefix+"username"),
configuration.GetString(prefix+"password"),
configuration.GetString(prefix+"hostname"),
configuration.GetInt(prefix+"port"),
configuration.GetString(prefix+"database"),
configuration.GetString(prefix+"sslmode"),
configuration.GetInt(prefix+"connection_max_idle"),
configuration.GetInt(prefix+"connection_max_open"),
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)
}
func (store *PostgresStore) initialize(user, password, hostname string, port int, database, sslmode string, maxIdle, maxOpen int) (err error) {
store.SqlInsert = "INSERT INTO filemeta (dirhash,name,directory,meta) VALUES($1,$2,$3,$4)"
store.SqlUpdate = "UPDATE filemeta SET meta=$1 WHERE dirhash=$2 AND name=$3 AND directory=$4"
store.SqlFind = "SELECT meta FROM filemeta WHERE dirhash=$1 AND name=$2 AND directory=$3"
store.SqlDelete = "DELETE FROM filemeta WHERE dirhash=$1 AND name=$2 AND directory=$3"
store.SqlDeleteFolderChildren = "DELETE FROM filemeta WHERE dirhash=$1 AND directory=$2"
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store.SqlListExclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>$2 AND directory=$3 ORDER BY NAME ASC LIMIT $4"
store.SqlListInclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>=$2 AND directory=$3 ORDER BY NAME ASC LIMIT $4"
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sqlUrl := fmt.Sprintf(CONNECTION_URL_PATTERN, hostname, port, user, sslmode)
if password != "" {
sqlUrl += " password="+password
}
if database != "" {
sqlUrl += " dbname="+database
}
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var dbErr error
store.DB, dbErr = sql.Open("postgres", sqlUrl)
if dbErr != nil {
store.DB.Close()
store.DB = nil
return fmt.Errorf("can not connect to %s error:%v", sqlUrl, err)
}
store.DB.SetMaxIdleConns(maxIdle)
store.DB.SetMaxOpenConns(maxOpen)
if err = store.DB.Ping(); err != nil {
return fmt.Errorf("connect to %s error:%v", sqlUrl, err)
}
return nil
}