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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"
"time"
"github.com/zeebo/errs"
"storj.io/common/uuid"
"storj.io/private/dbutil"
"storj.io/storj/satellite/metabase"
"storj.io/storj/satellite/repair/queue"
"storj.io/storj/satellite/satellitedb/dbx"
"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 *queue.InjuredSegment) (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 segment health 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.impl {
case dbutil.Postgres:
query = `
INSERT INTO repair_queue
(
stream_id, position, segment_health
)
VALUES (
$1, $2, $3
)
ON CONFLICT (stream_id, position)
DO UPDATE
SET segment_health=$3, updated_at=current_timestamp
RETURNING (xmax != 0) AS alreadyInserted
`
case dbutil.Cockroach:
query = `
WITH updater AS (
UPDATE repair_queue SET segment_health = $3, updated_at = current_timestamp
WHERE stream_id = $1 AND position = $2
RETURNING *
)
INSERT INTO repair_queue (stream_id, position, segment_health)
SELECT $1, $2, $3
WHERE NOT EXISTS (SELECT * FROM updater)
RETURNING false
`
}
rows, err := r.db.QueryContext(ctx, query, seg.StreamID, seg.Position.Encode(), seg.SegmentHealth)
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 *queue.InjuredSegment, err error) {
defer mon.Task()(&ctx)(&err)
segment := queue.InjuredSegment{}
switch r.db.impl {
case dbutil.Cockroach:
err = r.db.QueryRowContext(ctx, `
UPDATE repair_queue SET attempted_at = now()
WHERE attempted_at IS NULL OR attempted_at < now() - interval '6 hours'
ORDER BY segment_health ASC, attempted_at NULLS FIRST
LIMIT 1
RETURNING stream_id, position, attempted_at, updated_at, inserted_at, segment_health
`).Scan(&segment.StreamID, &segment.Position, &segment.AttemptedAt,
&segment.UpdatedAt, &segment.InsertedAt, &segment.SegmentHealth)
case dbutil.Postgres:
err = r.db.QueryRowContext(ctx, `
UPDATE repair_queue SET attempted_at = now() WHERE (stream_id, position) = (
SELECT stream_id, position FROM repair_queue
WHERE attempted_at IS NULL OR attempted_at < now() - interval '6 hours'
ORDER BY segment_health ASC, attempted_at NULLS FIRST FOR UPDATE SKIP LOCKED LIMIT 1
) RETURNING stream_id, position, attempted_at, updated_at, inserted_at, segment_health
`).Scan(&segment.StreamID, &segment.Position, &segment.AttemptedAt,
&segment.UpdatedAt, &segment.InsertedAt, &segment.SegmentHealth)
default:
return seg, errs.New("unhandled database: %v", r.db.impl)
}
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, storage.ErrEmptyQueue.New("")
}
return nil, err
}
return &segment, err
}
func (r *repairQueue) Delete(ctx context.Context, seg *queue.InjuredSegment) (err error) {
defer mon.Task()(&ctx)(&err)
_, err = r.db.ExecContext(ctx, r.db.Rebind(`DELETE FROM repair_queue WHERE stream_id = ? AND position = ?`), seg.StreamID, seg.Position.Encode())
return Error.Wrap(err)
}
func (r *repairQueue) Clean(ctx context.Context, before time.Time) (deleted int64, err error) {
defer mon.Task()(&ctx)(&err)
n, err := r.db.Delete_RepairQueue_By_UpdatedAt_Less(ctx, dbx.RepairQueue_UpdatedAt(before))
return n, Error.Wrap(err)
}
func (r *repairQueue) SelectN(ctx context.Context, limit int) (segs []queue.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 stream_id, position, attempted_at, updated_at, segment_health
FROM repair_queue LIMIT ?`), limit,
)
if err != nil {
return nil, Error.Wrap(err)
}
defer func() { err = errs.Combine(err, rows.Close()) }()
for rows.Next() {
var seg queue.InjuredSegment
err = rows.Scan(&seg.StreamID, &seg.Position, &seg.AttemptedAt,
&seg.UpdatedAt, &seg.SegmentHealth)
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 repair_queue`)).Scan(&count)
return count, Error.Wrap(err)
}
// TestingSetAttemptedTime sets attempted time for a segment.
func (r *repairQueue) TestingSetAttemptedTime(ctx context.Context, streamID uuid.UUID,
position metabase.SegmentPosition, t time.Time) (rowsAffected int64, err error) {
defer mon.Task()(&ctx)(&err)
res, err := r.db.ExecContext(ctx,
r.db.Rebind(`UPDATE repair_queue SET attempted_at = ? WHERE stream_id = ? AND position = ?`),
t, streamID, position.Encode(),
)
if err != nil {
return 0, Error.Wrap(err)
}
count, err := res.RowsAffected()
return count, Error.Wrap(err)
}