storj/storagenode/storagenodedb/vouchers.go

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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package storagenodedb
import (
"context"
"database/sql"
"strings"
"time"
"github.com/gogo/protobuf/proto"
"github.com/zeebo/errs"
"storj.io/storj/pkg/pb"
"storj.io/storj/pkg/storj"
"storj.io/storj/storagenode/vouchers"
)
type vouchersdb struct{ *InfoDB }
// Vouchers returns database for storing vouchers
func (db *DB) Vouchers() vouchers.DB { return db.info.Vouchers() }
// Vouchers returns database for storing vouchers
func (db *InfoDB) Vouchers() vouchers.DB { return &vouchersdb{db} }
// Put inserts or updates a voucher from a satellite
func (db *vouchersdb) Put(ctx context.Context, voucher *pb.Voucher) (err error) {
defer mon.Task()(&ctx)(&err)
voucherSerialized, err := proto.Marshal(voucher)
if err != nil {
return ErrInfo.Wrap(err)
}
_, err = db.db.Exec(`
INSERT INTO vouchers(
satellite_id,
voucher_serialized,
expiration
) VALUES (?, ?, ?)
ON CONFLICT(satellite_id) DO UPDATE SET
voucher_serialized = ?,
expiration = ?
`, voucher.SatelliteId, voucherSerialized, voucher.Expiration.UTC(), voucherSerialized, voucher.Expiration.UTC())
return err
}
// NeedVoucher returns true if a voucher from a particular satellite is expired, about to expire, or does not exist
func (db *vouchersdb) NeedVoucher(ctx context.Context, satelliteID storj.NodeID, expirationBuffer time.Duration) (need bool, err error) {
defer mon.Task()(&ctx)(&err)
expiresBefore := time.Now().Add(expirationBuffer)
// query returns row if voucher is good. If not, it is either expiring or does not exist
row := db.db.QueryRow(`
SELECT satellite_id
FROM vouchers
WHERE satellite_id = ? AND expiration >= ?
`, satelliteID, expiresBefore.UTC())
var bytes []byte
err = row.Scan(&bytes)
if err != nil {
if err == sql.ErrNoRows {
return true, nil
}
return false, ErrInfo.Wrap(err)
}
return false, nil
}
// GetValid returns one valid voucher from the list of approved satellites
func (db *vouchersdb) GetValid(ctx context.Context, satellites []storj.NodeID) (_ *pb.Voucher, err error) {
defer mon.Task()(&ctx)(&err)
if len(satellites) == 0 {
return nil, errs.New("at least one satellite required")
}
idCondition := `satellite_id IN (?` + strings.Repeat(", ?", len(satellites)-1) + `)`
var args []interface{}
for _, id := range satellites {
args = append(args, id)
}
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args = append(args, time.Now().UTC())
row := db.db.QueryRow(db.InfoDB.Rebind(`
SELECT voucher_serialized
FROM vouchers
WHERE `+idCondition+`
AND expiration > ?
LIMIT 1
`), args...)
var bytes []byte
err = row.Scan(&bytes)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, ErrInfo.Wrap(err)
}
voucher := &pb.Voucher{}
err = proto.Unmarshal(bytes, voucher)
if err != nil {
return nil, ErrInfo.Wrap(err)
}
return voucher, nil
}