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package repo
import (
"context"
"database/sql"
"errors"
"fmt"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
blockstore "github.com/ipfs/go-ipfs-blockstore"
ipld "github.com/ipfs/go-ipld-format"
)
type blockQueryer interface {
QueryRowContext(ctx context.Context, query string, args ...any) *sql.Row
QueryContext(ctx context.Context, query string, args ...any) (*sql.Rows, error)
}
func verifyBlock(c cid.Cid, data []byte) error {
computed, err := c.Prefix().Sum(data)
if err != nil {
return fmt.Errorf("hashing block %s: %w", c, err)
}
if !computed.Equals(c) {
return fmt.Errorf("block %s: %w", c, blocks.ErrWrongHash)
}
return nil
}
func readBlock(ctx context.Context, q blockQueryer, did string, c cid.Cid) (blocks.Block, error) {
var data []byte
err := q.QueryRowContext(ctx, "SELECT data FROM atrepo_blocks WHERE did = ? AND cid = ?", did, c.String()).Scan(&data)
if errors.Is(err, sql.ErrNoRows) {
return nil, ipld.ErrNotFound{Cid: c}
}
if err != nil {
return nil, fmt.Errorf("reading block %s: %w", c, err)
}
if err := verifyBlock(c, data); err != nil {
return nil, err
}
return blocks.NewBlockWithCid(data, c)
}
type sqlBlockReader struct {
db *sql.DB
did string
}
func (r *sqlBlockReader) Get(ctx context.Context, c cid.Cid) (blocks.Block, error) {
return readBlock(ctx, r.db, r.did, c)
}
func (r *sqlBlockReader) HashOnRead(enabled bool) {
}
type txBlockstore struct {
tx *sql.Tx
did string
order []cid.Cid
blocks map[cid.Cid]blocks.Block
}
func newTxBlockstore(ctx context.Context, tx *sql.Tx, did string) *txBlockstore {
return &txBlockstore{
tx: tx,
did: did,
blocks: make(map[cid.Cid]blocks.Block),
}
}
func (b *txBlockstore) DeleteBlock(ctx context.Context, c cid.Cid) error {
return fmt.Errorf("blockstore is append only")
}
func (b *txBlockstore) Has(ctx context.Context, c cid.Cid) (bool, error) {
var one int
err := b.tx.QueryRowContext(ctx, "SELECT 1 FROM atrepo_blocks WHERE did = ? AND cid = ?", b.did, c.String()).Scan(&one)
if errors.Is(err, sql.ErrNoRows) {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
}
func (b *txBlockstore) Get(ctx context.Context, c cid.Cid) (blocks.Block, error) {
if blk, ok := b.blocks[c]; ok {
return blk, nil
}
return readBlock(ctx, b.tx, b.did, c)
}
func (b *txBlockstore) GetSize(ctx context.Context, c cid.Cid) (int, error) {
var size int
err := b.tx.QueryRowContext(ctx, "SELECT length(data) FROM atrepo_blocks WHERE did = ? AND cid = ?", b.did, c.String()).Scan(&size)
if errors.Is(err, sql.ErrNoRows) {
return 0, ipld.ErrNotFound{Cid: c}
}
return size, err
}
func (b *txBlockstore) Put(ctx context.Context, blk blocks.Block) error {
c := blk.Cid()
if _, ok := b.blocks[c]; !ok {
b.order = append(b.order, c)
}
b.blocks[c] = blk
_, err := b.tx.ExecContext(ctx, "INSERT OR IGNORE INTO atrepo_blocks (did, cid, data) VALUES (?, ?, ?)", b.did, c.String(), blk.RawData())
if err != nil {
return fmt.Errorf("writing block %s: %w", c, err)
}
return nil
}
func (b *txBlockstore) PutMany(ctx context.Context, blks []blocks.Block) error {
for _, blk := range blks {
if err := b.Put(ctx, blk); err != nil {
return err
}
}
return nil
}
func (b *txBlockstore) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) {
rows, err := b.tx.QueryContext(ctx, "SELECT cid FROM atrepo_blocks WHERE did = ?", b.did)
if err != nil {
return nil, err
}
defer rows.Close()
var keys []cid.Cid
for rows.Next() {
var raw string
if err := rows.Scan(&raw); err != nil {
break
}
c, err := cid.Parse(raw)
if err != nil {
break
}
keys = append(keys, c)
}
out := make(chan cid.Cid, len(keys))
for _, c := range keys {
out <- c
}
close(out)
return out, nil
}
func (b *txBlockstore) HashOnRead(enabled bool) {
}
func (b *txBlockstore) orderedFrom(first cid.Cid) []blocks.Block {
out := make([]blocks.Block, 0, len(b.blocks))
seen := make(map[cid.Cid]bool, len(b.blocks))
if blk, ok := b.blocks[first]; ok {
out = append(out, blk)
seen[first] = true
}
for _, c := range b.order {
if seen[c] {
continue
}
blk, ok := b.blocks[c]
if !ok {
continue
}
seen[c] = true
out = append(out, blk)
}
return out
}
var _ blockstore.Blockstore = (*txBlockstore)(nil)
