171 lines
3.2 KiB
Go
171 lines
3.2 KiB
Go
package sqlite
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import (
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"database/sql"
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_ "github.com/mattn/go-sqlite3"
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"github.com/sirupsen/logrus"
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"mapserver/coords"
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"mapserver/db"
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"time"
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)
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/*
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sqlite extract: https://stackoverflow.com/questions/15448373/how-to-dump-a-file-stored-in-a-sqlite-database-as-a-blob
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sqlite3 my.db "SELECT writefile('object0.gz', MyBlob) FROM MyTable WHERE id = 1"
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*/
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type Sqlite3Accessor struct {
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db *sql.DB
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filename string
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}
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func (db *Sqlite3Accessor) Migrate() error {
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//RW connection
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rwdb, err := sql.Open("sqlite3", db.filename+"?mode=rw")
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if err != nil {
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return err
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}
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defer rwdb.Close()
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hasMtime := true
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_, err = rwdb.Query("select max(mtime) from blocks")
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if err != nil {
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hasMtime = false
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}
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if !hasMtime {
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log.WithFields(logrus.Fields{"filename": db.filename}).Info("Migrating database")
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start := time.Now()
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_, err = rwdb.Exec(migrateScript)
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if err != nil {
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return err
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}
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t := time.Now()
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elapsed := t.Sub(start)
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log.WithFields(logrus.Fields{"elapsed": elapsed}).Info("Migration completed")
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}
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return nil
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}
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func convertRows(pos int64, data []byte, mtime int64) *db.Block {
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c := coords.PlainToCoord(pos)
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return &db.Block{Pos: c, Data: data, Mtime: mtime}
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}
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func (this *Sqlite3Accessor) FindBlocksByMtime(gtmtime int64, limit int) ([]*db.Block, error) {
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blocks := make([]*db.Block, 0)
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rows, err := this.db.Query(getBlocksByMtimeQuery, gtmtime, limit)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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for rows.Next() {
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var pos int64
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var data []byte
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var mtime int64
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err = rows.Scan(&pos, &data, &mtime)
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if err != nil {
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return nil, err
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}
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mb := convertRows(pos, data, mtime)
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blocks = append(blocks, mb)
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}
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return blocks, nil
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}
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func (this *Sqlite3Accessor) FindLegacyBlocksByPos(lastpos *coords.MapBlockCoords, limit int) ([]*db.Block, error) {
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blocks := make([]*db.Block, 0)
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pc := coords.CoordToPlain(lastpos)
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rows, err := this.db.Query(getLastBlockQuery, pc, limit)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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for rows.Next() {
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var pos int64
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var data []byte
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var mtime int64
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err = rows.Scan(&pos, &data, &mtime)
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if err != nil {
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return nil, err
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}
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mb := convertRows(pos, data, mtime)
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blocks = append(blocks, mb)
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}
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return blocks, nil
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}
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func (db *Sqlite3Accessor) CountBlocks(frommtime, tomtime int64) (int, error) {
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rows, err := db.db.Query(countBlocksQuery, frommtime, tomtime)
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if err != nil {
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return 0, err
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}
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defer rows.Close()
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if rows.Next() {
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var count int64
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err = rows.Scan(&count)
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if err != nil {
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return 0, err
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}
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return int(count), nil
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}
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return 0, nil
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}
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func (db *Sqlite3Accessor) GetBlock(pos *coords.MapBlockCoords) (*db.Block, error) {
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ppos := coords.CoordToPlain(pos)
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rows, err := db.db.Query(getBlockQuery, ppos)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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if rows.Next() {
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var pos int64
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var data []byte
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var mtime int64
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err = rows.Scan(&pos, &data, &mtime)
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if err != nil {
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return nil, err
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}
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mb := convertRows(pos, data, mtime)
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return mb, nil
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}
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return nil, nil
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}
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func New(filename string) (*Sqlite3Accessor, error) {
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db, err := sql.Open("sqlite3", filename+"?mode=ro&_timeout=2000")
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if err != nil {
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return nil, err
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}
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sq := &Sqlite3Accessor{db: db, filename: filename}
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return sq, nil
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}
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