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// Package pdatadb implements sqlite3 database storage for pdata.
package pdatadb
import (
"bytes"
"compress/gzip"
"crypto/sha256"
"database/sql"
"encoding/hex"
"errors"
"fmt"
"net/url"
"github.com/jmoiron/sqlx"
)
// DB stores player data in a sqlite3 database.
type DB struct {
x *sqlx.DB
}
// Open opens a DB from the provided sqlite3 uri.
func Open(name string) (*DB, error) {
// note: WAL and a larger pagesize makes our writes and queries MUCH faster
x, err := sqlx.Connect("sqlite3", (&url.URL{
Path: name,
RawQuery: (url.Values{
"_journal": {"WAL"},
"_busy_timeout": {"4000"},
}).Encode(),
}).String())
if err != nil {
return nil, err
}
if _, err := x.Exec(`PRAGMA page_size = 8192`); err != nil {
panic(err)
}
return &DB{x}, nil
}
func (db *DB) Close() error {
return db.x.Close()
}
func (db *DB) GetPdataHash(uid uint64) (hash [sha256.Size]byte, exists bool, err error) {
var pdataHash string
if err := db.x.Get(&pdataHash, `SELECT pdata_hash FROM pdata WHERE uid = ?`, uid); err != nil {
if errors.Is(err, sql.ErrNoRows) {
return hash, false, nil
}
return hash, false, err
}
if b, err := hex.DecodeString(pdataHash); err != nil || len(b) != len(hash) {
return hash, false, fmt.Errorf("invalid pdata hash")
} else {
copy(hash[:], b)
}
return hash, true, nil
}
func (db *DB) GetPdataCached(uid uint64, sha [sha256.Size]byte) (buf []byte, exists bool, err error) {
tx, err := db.x.Beginx()
if err != nil {
return nil, false, nil
}
defer tx.Rollback()
if sha != [sha256.Size]byte{} {
var pdataHash string
var pdataHashB [sha256.Size]byte
if err := db.x.Get(&pdataHash, `SELECT pdata_hash FROM pdata WHERE uid = ?`, uid); err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, false, nil
}
return nil, false, err
}
if b, err := hex.DecodeString(pdataHash); err != nil || len(b) != len(pdataHashB) {
return nil, false, fmt.Errorf("invalid pdata hash")
} else {
copy(pdataHashB[:], b)
}
if pdataHashB == sha {
return nil, true, nil
}
}
var obj struct {
PdataComp string `db:"pdata_comp"`
PdataHash string `db:"pdata_hash"`
Pdata []byte `db:"pdata"`
}
if err := db.x.Get(&obj, `SELECT pdata_comp, pdata_hash, pdata FROM pdata WHERE uid = ?`, uid); err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, false, nil
}
return nil, false, err
}
switch obj.PdataComp {
case "":
case "gzip":
var b bytes.Buffer
zr, err := gzip.NewReader(bytes.NewReader(obj.Pdata))
if err != nil {
return nil, false, fmt.Errorf("decompress gzip: %w", err)
}
if _, err := b.ReadFrom(zr); err != nil {
return nil, false, fmt.Errorf("decompress gzip: %w", err)
}
if err := zr.Close(); err != nil {
return nil, false, fmt.Errorf("decompress gzip: %w", err)
}
obj.Pdata = b.Bytes()
default:
return nil, false, fmt.Errorf("unsupported compression method %q", obj.PdataComp)
}
var pdataHashB [sha256.Size]byte
if b, err := hex.DecodeString(obj.PdataHash); err != nil || len(b) != len(pdataHashB) {
return nil, false, fmt.Errorf("invalid pdata hash")
} else {
copy(pdataHashB[:], b)
}
if sha256.Sum256(obj.Pdata) != pdataHashB {
return nil, false, fmt.Errorf("pdata checksum mismatch")
}
return obj.Pdata, true, nil
}
func (db *DB) SetPdata(uid uint64, buf []byte) (n int, err error) {
hash := sha256.Sum256(buf)
pdataHash := hex.EncodeToString(hash[:])
var b bytes.Buffer
b.Grow(2000)
zw := gzip.NewWriter(&b)
if _, err := zw.Write(buf); err != nil {
return 0, fmt.Errorf("compress pdata: %w", err)
}
if err := zw.Close(); err != nil {
return 0, fmt.Errorf("compress pdata: %w", err)
}
var pdataComp string
if b.Len() < len(buf) {
pdataComp = "gzip"
buf = b.Bytes()
}
if _, err := db.x.NamedExec(`
INSERT OR REPLACE INTO
pdata ( uid, pdata_comp, pdata_hash, pdata)
VALUES (:uid, :pdata_comp, :pdata_hash, :pdata)
`, map[string]any{
"uid": uid,
"pdata_comp": pdataComp,
"pdata_hash": pdataHash,
"pdata": buf,
}); err != nil {
return 0, err
}
return len(buf), nil
}
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