forked from notaryproject/notary
/
sqldb.go
322 lines (290 loc) · 8.42 KB
/
sqldb.go
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package storage
import (
"crypto/sha256"
"encoding/hex"
"fmt"
"strconv"
"time"
"github.com/go-sql-driver/mysql"
"github.com/jinzhu/gorm"
"github.com/sirupsen/logrus"
"github.com/hunter1085/notary/tuf/data"
)
// SQLStorage implements a versioned store using a relational database.
// See server/storage/models.go
type SQLStorage struct {
gorm.DB
}
// NewSQLStorage is a convenience method to create a SQLStorage
func NewSQLStorage(dialect string, args ...interface{}) (*SQLStorage, error) {
gormDB, err := gorm.Open(dialect, args...)
if err != nil {
return nil, err
}
return &SQLStorage{
DB: *gormDB,
}, nil
}
// translateOldVersionError captures DB errors, and attempts to translate
// duplicate entry - currently only supports MySQL and Sqlite3
func translateOldVersionError(err error) error {
switch err := err.(type) {
case *mysql.MySQLError:
// https://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html
// 1022 = Can't write; duplicate key in table '%s'
// 1062 = Duplicate entry '%s' for key %d
if err.Number == 1022 || err.Number == 1062 {
return ErrOldVersion{}
}
}
return err
}
// UpdateCurrent updates a single TUF.
func (db *SQLStorage) UpdateCurrent(gun data.GUN, update MetaUpdate) error {
// ensure we're not inserting an immediately old version - can't use the
// struct, because that only works with non-zero values, and Version
// can be 0.
exists := db.Where("gun = ? and role = ? and version >= ?",
gun.String(), update.Role.String(), update.Version).First(&TUFFile{})
if !exists.RecordNotFound() {
return ErrOldVersion{}
}
// only take out the transaction once we're about to start writing
tx, rb, err := db.getTransaction()
if err != nil {
return err
}
checksum := sha256.Sum256(update.Data)
hexChecksum := hex.EncodeToString(checksum[:])
if err := func() error {
// write new TUFFile entry
if err = translateOldVersionError(tx.Create(&TUFFile{
Gun: gun.String(),
Role: update.Role.String(),
Version: update.Version,
SHA256: hexChecksum,
Data: update.Data,
}).Error); err != nil {
return err
}
// If we're publishing a timestamp, update the changefeed as this is
// technically an new version of the TUF repo
if update.Role == data.CanonicalTimestampRole {
if err := db.writeChangefeed(tx, gun, update.Version, hexChecksum); err != nil {
return err
}
}
return nil
}(); err != nil {
return rb(err)
}
return tx.Commit().Error
}
type rollback func(error) error
func (db *SQLStorage) getTransaction() (*gorm.DB, rollback, error) {
tx := db.Begin()
if tx.Error != nil {
return nil, nil, tx.Error
}
rb := func(err error) error {
if rxErr := tx.Rollback().Error; rxErr != nil {
logrus.Error("Failed on Tx rollback with error: ", rxErr.Error())
return rxErr
}
return err
}
return tx, rb, nil
}
// UpdateMany atomically updates many TUF records in a single transaction
func (db *SQLStorage) UpdateMany(gun data.GUN, updates []MetaUpdate) error {
tx, rb, err := db.getTransaction()
if err != nil {
return err
}
var (
query *gorm.DB
added = make(map[uint]bool)
)
if err := func() error {
for _, update := range updates {
// This looks like the same logic as UpdateCurrent, but if we just
// called, version ordering in the updates list must be enforced
// (you cannot insert the version 2 before version 1). And we do
// not care about monotonic ordering in the updates.
query = db.Where("gun = ? and role = ? and version >= ?",
gun.String(), update.Role.String(), update.Version).First(&TUFFile{})
if !query.RecordNotFound() {
return ErrOldVersion{}
}
var row TUFFile
checksum := sha256.Sum256(update.Data)
hexChecksum := hex.EncodeToString(checksum[:])
query = tx.Where(map[string]interface{}{
"gun": gun.String(),
"role": update.Role.String(),
"version": update.Version,
}).Attrs("data", update.Data).Attrs("sha256", hexChecksum).FirstOrCreate(&row)
if query.Error != nil {
return translateOldVersionError(query.Error)
}
// it's previously been added, which means it's a duplicate entry
// in the same transaction
if _, ok := added[row.ID]; ok {
return ErrOldVersion{}
}
if update.Role == data.CanonicalTimestampRole {
if err := db.writeChangefeed(tx, gun, update.Version, hexChecksum); err != nil {
return err
}
}
added[row.ID] = true
}
return nil
}(); err != nil {
return rb(err)
}
return tx.Commit().Error
}
func (db *SQLStorage) writeChangefeed(tx *gorm.DB, gun data.GUN, version int, checksum string) error {
c := &SQLChange{
GUN: gun.String(),
Version: version,
SHA256: checksum,
Category: changeCategoryUpdate,
}
return tx.Create(c).Error
}
// GetCurrent gets a specific TUF record
func (db *SQLStorage) GetCurrent(gun data.GUN, tufRole data.RoleName) (*time.Time, []byte, error) {
var row TUFFile
q := db.Select("updated_at, data").Where(
&TUFFile{Gun: gun.String(), Role: tufRole.String()}).Order("version desc").Limit(1).First(&row)
if err := isReadErr(q, row); err != nil {
return nil, nil, err
}
return &(row.UpdatedAt), row.Data, nil
}
// GetChecksum gets a specific TUF record by its hex checksum
func (db *SQLStorage) GetChecksum(gun data.GUN, tufRole data.RoleName, checksum string) (*time.Time, []byte, error) {
var row TUFFile
q := db.Select("created_at, data").Where(
&TUFFile{
Gun: gun.String(),
Role: tufRole.String(),
SHA256: checksum,
},
).First(&row)
if err := isReadErr(q, row); err != nil {
return nil, nil, err
}
return &(row.CreatedAt), row.Data, nil
}
// GetVersion gets a specific TUF record by its version
func (db *SQLStorage) GetVersion(gun data.GUN, tufRole data.RoleName, version int) (*time.Time, []byte, error) {
var row TUFFile
q := db.Select("created_at, data").Where(
&TUFFile{
Gun: gun.String(),
Role: tufRole.String(),
Version: version,
},
).First(&row)
if err := isReadErr(q, row); err != nil {
return nil, nil, err
}
return &(row.CreatedAt), row.Data, nil
}
func isReadErr(q *gorm.DB, row TUFFile) error {
if q.RecordNotFound() {
return ErrNotFound{}
} else if q.Error != nil {
return q.Error
}
return nil
}
// Delete deletes all the records for a specific GUN - we have to do a hard delete using Unscoped
// otherwise we can't insert for that GUN again
func (db *SQLStorage) Delete(gun data.GUN) error {
tx, rb, err := db.getTransaction()
if err != nil {
return err
}
if err := func() error {
res := tx.Unscoped().Where(&TUFFile{Gun: gun.String()}).Delete(TUFFile{})
if err := res.Error; err != nil {
return err
}
// if there weren't actually any records for the GUN, don't write
// a deletion change record.
if res.RowsAffected == 0 {
return nil
}
c := &SQLChange{
GUN: gun.String(),
Category: changeCategoryDeletion,
}
return tx.Create(c).Error
}(); err != nil {
return rb(err)
}
return tx.Commit().Error
}
// CheckHealth asserts that the tuf_files table is present
func (db *SQLStorage) CheckHealth() error {
tableOk := db.HasTable(&TUFFile{})
if db.Error != nil {
return db.Error
}
if !tableOk {
return fmt.Errorf(
"Cannot access table: %s", TUFFile{}.TableName())
}
return nil
}
// GetChanges returns up to pageSize changes starting from changeID.
func (db *SQLStorage) GetChanges(changeID string, records int, filterName string) ([]Change, error) {
var (
changes []Change
query = &db.DB
id int64
err error
)
if changeID == "" {
id = 0
} else {
id, err = strconv.ParseInt(changeID, 10, 32)
if err != nil {
return nil, ErrBadQuery{msg: fmt.Sprintf("change ID expected to be integer, provided ID was: %s", changeID)}
}
}
// do what I mean, not what I said, i.e. if I passed a negative number for the ID
// it's assumed I mean "start from latest and go backwards"
reversed := id < 0
if records < 0 {
reversed = true
records = -records
}
if filterName != "" {
query = query.Where("gun = ?", filterName)
}
if reversed {
if id > 0 {
// only set the id check if we're not starting from "latest"
query = query.Where("id < ?", id)
}
query = query.Order("id desc")
} else {
query = query.Where("id > ?", id).Order("id asc")
}
res := query.Limit(records).Find(&changes)
if res.Error != nil {
return nil, res.Error
}
if reversed {
// results are currently newest to oldest, should be oldest to newest
for i, j := 0, len(changes)-1; i < j; i, j = i+1, j-1 {
changes[i], changes[j] = changes[j], changes[i]
}
}
return changes, nil
}