mirror of https://github.com/jlelse/GoBlog
186 lines
4.1 KiB
Go
186 lines
4.1 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"errors"
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"log"
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"os"
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"sync"
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sqlite "github.com/mattn/go-sqlite3"
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"github.com/schollz/sqlite3dump"
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"golang.org/x/sync/singleflight"
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)
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type database struct {
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db *sql.DB
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c context.Context
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cf context.CancelFunc
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stmts map[string]*sql.Stmt
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g singleflight.Group
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pc singleflight.Group
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pcm sync.Mutex
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}
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func (a *goBlog) initDatabase() (err error) {
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log.Println("Initialize database...")
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// Setup db
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db, err := a.openDatabase(a.cfg.Db.File, true)
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if err != nil {
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return err
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}
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// Create appDB
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a.db = db
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a.shutdown.Add(func() {
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if err := db.close(); err != nil {
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log.Printf("Failed to close database: %v", err)
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} else {
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log.Println("Closed database")
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}
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})
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if a.cfg.Db.DumpFile != "" {
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a.hourlyHooks = append(a.hourlyHooks, func() {
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db.dump(a.cfg.Db.DumpFile)
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})
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db.dump(a.cfg.Db.DumpFile)
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}
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log.Println("Initialized database")
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return nil
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}
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func (a *goBlog) openDatabase(file string, logging bool) (*database, error) {
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// Register driver
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dbDriverName := generateRandomString(15)
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sql.Register("goblog_db_"+dbDriverName, &sqlite.SQLiteDriver{
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ConnectHook: func(c *sqlite.SQLiteConn) error {
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// Depends on app
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if err := c.RegisterFunc("mdtext", a.renderText, true); err != nil {
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return err
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}
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// Independent
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if err := c.RegisterFunc("tolocal", toLocalSafe, true); err != nil {
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return err
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}
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if err := c.RegisterFunc("wordcount", wordCount, true); err != nil {
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return err
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}
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if err := c.RegisterFunc("charcount", charCount, true); err != nil {
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return err
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}
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return nil
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},
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})
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// Open db
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db, err := sql.Open("goblog_db_"+dbDriverName, file+"?cache=shared&mode=rwc&_journal_mode=WAL")
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if err != nil {
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return nil, err
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}
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db.SetMaxOpenConns(1)
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err = db.Ping()
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if err != nil {
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return nil, err
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}
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// Check available SQLite features
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rows, err := db.Query("pragma compile_options")
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if err != nil {
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return nil, err
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}
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cos := map[string]bool{}
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var co string
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for rows.Next() {
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err = rows.Scan(&co)
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if err != nil {
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return nil, err
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}
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cos[co] = true
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}
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if _, ok := cos["ENABLE_FTS5"]; !ok {
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return nil, errors.New("sqlite not compiled with FTS5")
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}
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// Migrate DB
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err = migrateDb(db, logging)
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if err != nil {
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return nil, err
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}
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c, cf := context.WithCancel(context.Background())
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return &database{
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db: db,
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stmts: map[string]*sql.Stmt{},
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c: c,
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cf: cf,
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}, nil
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}
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// Main features
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func (db *database) dump(file string) {
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f, err := os.Create(file)
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if err != nil {
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log.Println("Error while dump db:", err.Error())
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return
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}
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if err = sqlite3dump.DumpDB(db.db, f, sqlite3dump.WithTransaction(true)); err != nil {
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log.Println("Error while dump db:", err.Error())
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}
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}
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func (db *database) close() error {
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db.cf()
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return db.db.Close()
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}
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func (db *database) prepare(query string) (*sql.Stmt, error) {
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stmt, err, _ := db.g.Do(query, func() (interface{}, error) {
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stmt, ok := db.stmts[query]
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if ok && stmt != nil {
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return stmt, nil
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}
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stmt, err := db.db.PrepareContext(db.c, query)
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if err != nil {
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return nil, err
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}
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db.stmts[query] = stmt
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return stmt, nil
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})
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if err != nil {
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return nil, err
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}
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return stmt.(*sql.Stmt), nil
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}
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func (db *database) exec(query string, args ...interface{}) (sql.Result, error) {
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stmt, err := db.prepare(query)
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if err != nil {
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return nil, err
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}
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return stmt.ExecContext(db.c, args...)
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}
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func (db *database) execMulti(query string, args ...interface{}) (sql.Result, error) {
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// Can't prepare the statement
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return db.db.ExecContext(db.c, query, args...)
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}
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func (db *database) query(query string, args ...interface{}) (*sql.Rows, error) {
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stmt, err := db.prepare(query)
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if err != nil {
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return nil, err
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}
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return stmt.QueryContext(db.c, args...)
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}
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func (db *database) queryRow(query string, args ...interface{}) (*sql.Row, error) {
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stmt, err := db.prepare(query)
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if err != nil {
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return nil, err
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}
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return stmt.QueryRowContext(db.c, args...), nil
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}
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// Other things
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func (d *database) rebuildFTSIndex() {
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_, _ = d.exec("insert into posts_fts(posts_fts) values ('rebuild')")
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}
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