118 lines
2.4 KiB
Go
118 lines
2.4 KiB
Go
package db
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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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"time"
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)
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var log *logrus.Entry
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func init(){
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log = logrus.WithFields(logrus.Fields{"prefix": "db/sqlite"})
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}
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const migrateScript = `
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alter table blocks add mtime integer default 0;
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create index blocks_mtime on blocks(mtime);
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CREATE TRIGGER update_blocks_mtime_insert after insert on blocks for each row
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begin
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update blocks set mtime = strftime('%s', 'now') where pos = new.pos;
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end;
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CREATE TRIGGER update_blocks_mtime_update after update on blocks for each row
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begin
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update blocks set mtime = strftime('%s', 'now') where pos = old.pos;
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end;
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`
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//TODO: initial run: https://stackoverflow.com/questions/14468586/efficient-paging-in-sqlite-with-millions-of-records
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//TODO: postgres test
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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) Block {
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c := coords.PlainToCoord(pos)
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return Block{Pos:c, Data:data, Mtime:mtime}
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}
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func (db *Sqlite3Accessor) FindLatestBlocks(mintime int64, limit int) ([]Block, error) {
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return make([]Block, 0), nil
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}
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const getBlockQuery = `
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select pos,data,mtime from blocks b where b.pos = ?
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`
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func (db *Sqlite3Accessor) GetBlock(pos coords.MapBlockCoords) (*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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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 NewSqliteAccessor(filename string) (*Sqlite3Accessor, error) {
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db, err := sql.Open("sqlite3", filename + "?mode=ro")
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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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