rename filer2 to filer

weed/filer/postgres/README.txt

@@ -0,0 +1,17 @@
+
+1. create "seaweedfs" database
+
+export PGHOME=/Library/PostgreSQL/10
+$PGHOME/bin/createdb --username=postgres --password seaweedfs
+
+2. create "filemeta" table
+$PGHOME/bin/psql --username=postgres --password seaweedfs
+
+CREATE TABLE IF NOT EXISTS filemeta (
+  dirhash     BIGINT,
+  name        VARCHAR(65535),
+  directory   VARCHAR(65535),
+  meta        bytea,
+  PRIMARY KEY (dirhash, name)
+);
+

weed/filer/postgres/postgres_store.go

@@ -0,0 +1,75 @@
+package postgres
+
+import (
+	"database/sql"
+	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/filer/abstract_sql"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	_ "github.com/lib/pq"
+)
+
+const (
+	CONNECTION_URL_PATTERN = "host=%s port=%d user=%s sslmode=%s connect_timeout=30"
+)
+
+func init() {
+	filer.Stores = append(filer.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) {
+	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"),
+	)
+}
+
+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"
+	store.SqlListExclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>$2 AND directory=$3 AND name like CONCAT($4,'%')ORDER BY NAME ASC LIMIT $5"
+	store.SqlListInclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>=$2 AND directory=$3 AND name like CONCAT($4,'%') ORDER BY NAME ASC LIMIT $5"
+
+	sqlUrl := fmt.Sprintf(CONNECTION_URL_PATTERN, hostname, port, user, sslmode)
+	if password != "" {
+		sqlUrl += " password=" + password
+	}
+	if database != "" {
+		sqlUrl += " dbname=" + database
+	}
+	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
+}