150 lines
2.7 KiB
Go
150 lines
2.7 KiB
Go
package postgres
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import (
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"database/sql"
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"mapserver/coords"
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"mapserver/db"
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"mapserver/vfs"
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"time"
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_ "github.com/lib/pq"
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"github.com/sirupsen/logrus"
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)
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type PostgresAccessor struct {
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db *sql.DB
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}
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func (db *PostgresAccessor) Migrate() error {
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hasMtime := true
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_, err := db.db.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.Info("Migrating database")
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start := time.Now()
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_, err = db.db.Exec(vfs.FSMustString(false, "/sql/postgres_mapdb_migrate.sql"))
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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(posx, posy, posz int, data []byte, mtime int64) *db.Block {
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c := coords.NewMapBlockCoords(posx, posy, posz)
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return &db.Block{Pos: c, Data: data, Mtime: mtime}
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}
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func (this *PostgresAccessor) 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 posx, posy, posz int
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var data []byte
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var mtime int64
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err = rows.Scan(&posx, &posy, &posz, &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(posx, posy, posz, 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 *PostgresAccessor) CountBlocks(frommtime, tomtime int64) (int, error) {
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rows, err := this.db.Query(countBlocksQuery, frommtime, tomtime)
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if err != nil {
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panic(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 *PostgresAccessor) GetTimestamp() (int64, error) {
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rows, err := db.db.Query(getTimestampQuery)
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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 ts float64
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err = rows.Scan(&ts)
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if err != nil {
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return 0, err
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}
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return int64(ts), nil
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}
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return 0, nil
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}
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func (this *PostgresAccessor) GetBlock(pos *coords.MapBlockCoords) (*db.Block, error) {
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rows, err := this.db.Query(getBlockQuery, pos.X, pos.Y, pos.Z)
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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 posx, posy, posz int
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var data []byte
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var mtime int64
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err = rows.Scan(&posx, &posy, &posz, &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(posx, posy, posz, 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(connStr string) (*PostgresAccessor, error) {
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db, err := sql.Open("postgres", connStr+" sslmode=disable")
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if err != nil {
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return nil, err
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}
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sq := &PostgresAccessor{db: db}
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return sq, nil
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}
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