migration: added migration to ancestry schema
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Sida Chen
parent
33c623427f
commit
318c85ed20
287
database/pgsql/migrations/00009_ancestry_schema.go
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287
database/pgsql/migrations/00009_ancestry_schema.go
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// Copyright 2016 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package migrations
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import (
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"database/sql"
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"errors"
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"fmt"
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"time"
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"github.com/guregu/null/zero"
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lru "github.com/hashicorp/golang-lru"
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"github.com/lib/pq"
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"github.com/remind101/migrate"
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"github.com/sirupsen/logrus"
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)
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// on error, the function will rollback every migration changes in database.
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func up(tx *sql.Tx) error {
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err := migrate.Queries([]string{
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`CREATE TABLE IF NOT EXISTS ancestry (
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id SERIAL PRIMARY KEY,
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name VARCHAR(128) NOT NULL,
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engineversion INT NOT NULL,
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unique(name, engineversion)
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)`,
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`INSERT INTO ancestry(name, engineversion) SELECT name, engineversion FROM layer`,
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`CREATE TABLE IF NOT EXISTS layer_ancestry(
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id SERIAL PRIMARY KEY,
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hash VARCHAR(128) NOT NULL,
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ancestry_id INT NOT NULL,
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ancestry_index INT NOT NULL,
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unique(ancestry_id, ancestry_index)
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)`,
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`CREATE INDEX ON ancestry(name)`,
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`CREATE INDEX ON layer_ancestry(ancestry_id)`,
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`CREATE INDEX ON layer_ancestry(hash)`,
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})(tx)
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countLayerNum := `SELECT count(id) FROM layer`
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selectLayer := `
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SELECT layer.name, layer.id, parent_id, ancestry.id, layer.engineversion
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FROM layer, ancestry
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WHERE ancestry.name = layer.name
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AND layer.id >= $1
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ORDER BY layer.id LIMIT $2`
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selectAncestry := `
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SELECT layer_ancestry.hash, layer.engineversion
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FROM ancestry, layer_ancestry, layer
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WHERE layer.id = $1
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AND ancestry.name = layer.name
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AND layer_ancestry.ancestry_id = ancestry.id
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ORDER BY layer_ancestry.ancestry_index`
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if err != nil {
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return err
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}
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totalCount := 0
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count := 0
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err = tx.QueryRow(countLayerNum).Scan(&totalCount)
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if err != nil {
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return err
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}
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logrus.Debugf("processing %d layers", totalCount)
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batchSize := 9600
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nextID := 0
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cache := newCache(960000)
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// until no layer is selected from database
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for {
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// for statistics
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cachehit := 0
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startBatch := time.Now()
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rows, err := tx.Query(selectLayer, nextID, batchSize)
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if err != nil {
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return err
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}
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// query a batch of layers to compute ancestries
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var (
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layerBatch = make([]layerBuffer, 0, batchSize)
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)
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startLayerSel := time.Now()
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for rows.Next() {
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layer := layerBuffer{}
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err = rows.Scan(&layer.hash, &layer.id, &layer.parentID, &layer.ancestryID, &layer.engineversion)
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if err != nil {
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rows.Close()
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return err
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}
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// the migration is based on assumption that a layer's parent id
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// should be less than the layer's id
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if layer.parentID.Valid && int(layer.parentID.Int64) > layer.id {
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rows.Close()
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return errors.New("unsupported in migration: layer id > layer's parent id")
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}
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layerBatch = append(layerBatch, layer)
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}
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err = rows.Close()
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if err != nil {
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return err
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}
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count += len(layerBatch)
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if len(layerBatch) == 0 {
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break
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} else {
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// set next layer batch's starting id
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nextID = layerBatch[len(layerBatch)-1].id + 1
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}
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layerSelCost := time.Since(startLayerSel)
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ancestrySel := time.Now()
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// construct ancestries for every layer
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ancestryBatch := []ancestryBuffer{}
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for _, layer := range layerBatch {
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var (
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ancestry ancestryBuffer
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incache bool
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layerHash string
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layerEngineversion int
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)
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if layer.parentID.Valid {
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if ancestry, incache = cache.get(int(layer.parentID.Int64)); !incache {
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ancestryRows, err := tx.Query(selectAncestry, layer.parentID.Int64)
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if err != nil {
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rows.Close()
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return err
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}
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for ancestryRows.Next() {
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err := ancestryRows.Scan(&layerHash, &layerEngineversion)
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if err != nil {
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rows.Close()
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ancestryRows.Close()
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return err
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}
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// enforce every layer to have the same
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// engineversion in an ancestry
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if layerEngineversion != layer.engineversion {
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rows.Close()
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ancestryRows.Close()
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return errors.New("Ancestry engineversion mismatch")
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}
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ancestry.layers = append(ancestry.layers, layerHash)
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}
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ancestryRows.Close()
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ancestry.layers = ancestry.layers[:]
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cache.add(int(layer.parentID.Int64), ancestry)
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} else {
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cachehit++
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}
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}
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ancestry.id = layer.ancestryID
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ancestry.layers = append(ancestry.layers, layer.hash)
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cache.add(layer.id, ancestry)
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ancestryBatch = append(ancestryBatch, ancestry)
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}
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ancestrySelCost := time.Since(ancestrySel)
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ancestryIns := time.Now()
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// batch insert ancestries
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insertAncestry, err := tx.Prepare(pq.CopyIn("layer_ancestry", "hash", "ancestry_id", "ancestry_index"))
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if err != nil {
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return err
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}
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for _, ancestry := range ancestryBatch {
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for i, layerHash := range ancestry.layers {
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_, err := insertAncestry.Exec(layerHash, ancestry.id, i)
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if err != nil {
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insertAncestry.Close()
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return err
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}
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}
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}
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_, err = insertAncestry.Exec()
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if err != nil {
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insertAncestry.Close()
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return err
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}
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err = insertAncestry.Close()
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if err != nil {
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return err
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}
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ancestryInsCost := time.Since(ancestryIns)
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logrus.WithFields(logrus.Fields{
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"progress": fmt.Sprintf("%f%%(%d/%d)", 100*float32(count)/float32(totalCount), count, totalCount),
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"layer sel": fmt.Sprintf("%v", layerSelCost),
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"ancestry sel": fmt.Sprintf("%v", ancestrySelCost),
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"ancestry ins": fmt.Sprintf("%v", ancestryInsCost),
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"total cost": fmt.Sprint(time.Since(startBatch)),
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"cache hit": fmt.Sprintf("%f%%", 100*float32(cachehit)/float32(len(ancestryBatch))),
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}).Debugln("finished ancestry")
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}
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err = migrate.Queries([]string{
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`ALTER TABLE layer_ancestry
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ADD CONSTRAINT layer_ancestry_ancestry_id_fkey
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FOREIGN KEY (ancestry_id)
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REFERENCES ancestry
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ON DELETE CASCADE`,
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})(tx)
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if err != nil {
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return err
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}
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return nil
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}
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func newCache(size int) ancestryCache {
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cache, err := lru.NewARC(size)
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if err != nil {
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return nil
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}
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return &arcCache{lru: cache}
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}
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type layerBuffer struct {
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id int
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hash string
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parentID zero.Int
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ancestryID int
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engineversion int
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}
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type ancestryBuffer struct {
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id int
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layers []string
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}
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type ancestryCache interface {
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add(id int, ancestry ancestryBuffer)
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get(id int) (ancestryBuffer, bool)
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}
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type arcCache struct {
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lru *lru.ARCCache
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}
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func (c *arcCache) add(layerID int, ancestry ancestryBuffer) {
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c.lru.Add(layerID, ancestry)
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}
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func (c *arcCache) get(layerID int) (ancestryBuffer, bool) {
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v, ok := c.lru.Get(layerID)
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if !ok {
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return ancestryBuffer{}, ok
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}
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r, ok := v.(ancestryBuffer)
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if !ok {
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panic("invalid cache")
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}
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return r, ok
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}
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func init() {
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RegisterMigration(migrate.Migration{
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ID: 9,
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Up: up,
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Down: migrate.Queries([]string{
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`DROP TABLE IF EXISTS layer_ancestry`,
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`DROP TABLE IF EXISTS ancestry`,
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}),
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})
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}
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