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repairqueue.go
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repairqueue.go
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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package satellitedb
import (
"context"
"database/sql"
"errors"
"github.com/zeebo/errs"
"storj.io/common/pb"
"storj.io/storj/private/dbutil"
"storj.io/storj/storage"
)
// RepairQueueSelectLimit defines how many items can be selected at the same time.
const RepairQueueSelectLimit = 1000
type repairQueue struct {
db *satelliteDB
}
func (r *repairQueue) Insert(ctx context.Context, seg *pb.InjuredSegment, numHealthy int) (alreadyInserted bool, err error) {
defer mon.Task()(&ctx)(&err)
// insert if not exists, or update healthy count if does exist
var query string
// we want to insert the segment if it is not in the queue, but update the number of healthy pieces if it already is in the queue
// we also want to know if the result was an insert or an update - this is the reasoning for the xmax section of the postgres query
// and the separate cockroach query (which the xmax trick does not work for)
switch r.db.implementation {
case dbutil.Postgres:
query = `
INSERT INTO injuredsegments
(
path, data, num_healthy_pieces
)
VALUES (
$1, $2, $3
)
ON CONFLICT (path)
DO UPDATE
SET num_healthy_pieces=$3
RETURNING (xmax != 0) AS alreadyInserted
`
case dbutil.Cockroach:
query = `
WITH updater AS (
UPDATE injuredsegments SET num_healthy_pieces = $3 WHERE path = $1
RETURNING *
)
INSERT INTO injuredsegments (path, data, num_healthy_pieces)
SELECT $1, $2, $3
WHERE NOT EXISTS (SELECT * FROM updater)
RETURNING false
`
}
rows, err := r.db.QueryContext(ctx, query, seg.Path, seg, numHealthy)
if err != nil {
return false, err
}
defer func() { err = errs.Combine(err, rows.Close()) }()
if !rows.Next() {
// cockroach query does not return anything if the segment is already in the queue
alreadyInserted = true
} else {
err = rows.Scan(&alreadyInserted)
if err != nil {
return false, err
}
}
return alreadyInserted, rows.Err()
}
func (r *repairQueue) Select(ctx context.Context) (seg *pb.InjuredSegment, err error) {
defer mon.Task()(&ctx)(&err)
switch r.db.implementation {
case dbutil.Cockroach:
err = r.db.QueryRowContext(ctx, `
UPDATE injuredsegments SET attempted = now() WHERE path = (
SELECT path FROM injuredsegments
WHERE attempted IS NULL OR attempted < now() - interval '6 hours'
ORDER BY num_healthy_pieces ASC, attempted LIMIT 1
) RETURNING data`).Scan(&seg)
case dbutil.Postgres:
err = r.db.QueryRowContext(ctx, `
UPDATE injuredsegments SET attempted = now() WHERE path = (
SELECT path FROM injuredsegments
WHERE attempted IS NULL OR attempted < now() - interval '6 hours'
ORDER BY num_healthy_pieces ASC, attempted NULLS FIRST FOR UPDATE SKIP LOCKED LIMIT 1
) RETURNING data`).Scan(&seg)
default:
return seg, errs.New("invalid dbType: %v", r.db.implementation)
}
if errors.Is(err, sql.ErrNoRows) {
err = storage.ErrEmptyQueue.New("")
}
return seg, err
}
func (r *repairQueue) Delete(ctx context.Context, seg *pb.InjuredSegment) (err error) {
defer mon.Task()(&ctx)(&err)
_, err = r.db.ExecContext(ctx, r.db.Rebind(`DELETE FROM injuredsegments WHERE path = ?`), seg.Path)
return Error.Wrap(err)
}
func (r *repairQueue) SelectN(ctx context.Context, limit int) (segs []pb.InjuredSegment, err error) {
defer mon.Task()(&ctx)(&err)
if limit <= 0 || limit > RepairQueueSelectLimit {
limit = RepairQueueSelectLimit
}
//todo: strictly enforce order-by or change tests
rows, err := r.db.QueryContext(ctx, r.db.Rebind(`SELECT data FROM injuredsegments LIMIT ?`), limit)
if err != nil {
return nil, Error.Wrap(err)
}
defer func() { err = errs.Combine(err, rows.Close()) }()
for rows.Next() {
var seg pb.InjuredSegment
err = rows.Scan(&seg)
if err != nil {
return segs, Error.Wrap(err)
}
segs = append(segs, seg)
}
return segs, Error.Wrap(rows.Err())
}
func (r *repairQueue) Count(ctx context.Context) (count int, err error) {
defer mon.Task()(&ctx)(&err)
// Count every segment regardless of how recently repair was last attempted
err = r.db.QueryRowContext(ctx, r.db.Rebind(`SELECT COUNT(*) as count FROM injuredsegments`)).Scan(&count)
return count, Error.Wrap(err)
}