clair/database/pgsql/ancestry/ancestry.go

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// Copyright 2019 clair authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ancestry
import (
"database/sql"
"errors"
log "github.com/sirupsen/logrus"
"github.com/coreos/clair/database"
"github.com/coreos/clair/database/pgsql/detector"
"github.com/coreos/clair/database/pgsql/layer"
"github.com/coreos/clair/database/pgsql/util"
)
const (
insertAncestry = `
INSERT INTO ancestry (name) VALUES ($1) RETURNING id`
findAncestryID = `SELECT id FROM ancestry WHERE name = $1`
removeAncestry = `DELETE FROM ancestry WHERE name = $1`
insertAncestryFeatures = `
INSERT INTO ancestry_feature
(ancestry_layer_id, namespaced_feature_id, feature_detector_id, namespace_detector_id) VALUES
($1, $2, $3, $4)`
)
func FindAncestry(tx *sql.Tx, name string) (database.Ancestry, bool, error) {
var (
ancestry = database.Ancestry{Name: name}
err error
)
id, ok, err := FindAncestryID(tx, name)
if !ok || err != nil {
return ancestry, ok, err
}
if ancestry.By, err = FindAncestryDetectors(tx, id); err != nil {
return ancestry, false, err
}
if ancestry.Layers, err = FindAncestryLayers(tx, id); err != nil {
return ancestry, false, err
}
return ancestry, true, nil
}
func UpsertAncestry(tx *sql.Tx, ancestry database.Ancestry) error {
if !ancestry.Valid() {
return database.ErrInvalidParameters
}
if err := RemoveAncestry(tx, ancestry.Name); err != nil {
return err
}
id, err := InsertAncestry(tx, ancestry.Name)
if err != nil {
return err
}
detectorIDs, err := detector.FindDetectorIDs(tx, ancestry.By)
if err != nil {
return err
}
// insert ancestry metadata
if err := InsertAncestryDetectors(tx, id, detectorIDs); err != nil {
return err
}
layers := make([]string, 0, len(ancestry.Layers))
for _, l := range ancestry.Layers {
layers = append(layers, l.Hash)
}
layerIDs, ok, err := layer.FindLayerIDs(tx, layers)
if err != nil {
return err
}
if !ok {
log.Error("layer cannot be found, this indicates that the internal logic of calling UpsertAncestry is wrong or the database is corrupted.")
return database.ErrMissingEntities
}
ancestryLayerIDs, err := InsertAncestryLayers(tx, id, layerIDs)
if err != nil {
return err
}
for i, id := range ancestryLayerIDs {
if err := InsertAncestryFeatures(tx, id, ancestry.Layers[i]); err != nil {
return err
}
}
return nil
}
func InsertAncestry(tx *sql.Tx, name string) (int64, error) {
var id int64
err := tx.QueryRow(insertAncestry, name).Scan(&id)
if err != nil {
if util.IsErrUniqueViolation(err) {
return 0, util.HandleError("insertAncestry", errors.New("other Go-routine is processing this ancestry (skip)"))
}
return 0, util.HandleError("insertAncestry", err)
}
return id, nil
}
func FindAncestryID(tx *sql.Tx, name string) (int64, bool, error) {
var id sql.NullInt64
if err := tx.QueryRow(findAncestryID, name).Scan(&id); err != nil {
if err == sql.ErrNoRows {
return 0, false, nil
}
return 0, false, util.HandleError("findAncestryID", err)
}
return id.Int64, true, nil
}
func RemoveAncestry(tx *sql.Tx, name string) error {
result, err := tx.Exec(removeAncestry, name)
if err != nil {
return util.HandleError("removeAncestry", err)
}
affected, err := result.RowsAffected()
if err != nil {
return util.HandleError("removeAncestry", err)
}
if affected != 0 {
log.WithField("ancestry", name).Debug("removed ancestry")
}
return nil
}