132 lines
2.7 KiB
Go
132 lines
2.7 KiB
Go
package main
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import (
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"database/sql"
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"fmt"
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"log"
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"os"
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"time"
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_ "github.com/mattn/go-sqlite3"
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)
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type DB struct {
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Ready bool
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path string
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readConn *sql.DB
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writeConn *sql.DB
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}
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func (db *DB) Open() error {
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if db.path == "" {
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return fmt.Errorf("database path not set")
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}
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file, err := os.Open(db.path)
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if err != nil {
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if os.IsNotExist(err) {
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log.Printf("Database file does not exist at %s, creating", db.path)
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file, err := os.Create(db.path)
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if err != nil {
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return fmt.Errorf("failed to create database file: %v", err)
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}
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log.Printf("Database created at %s", db.path)
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file.Close()
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} else {
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return fmt.Errorf("failed to open database file: %v", err)
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}
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}
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file.Close()
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writeConn, err := sql.Open("sqlite3", db.path+"?_journal=WAL&_synchronous=NORMAL")
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if err != nil {
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Error.Printf("%++v", err)
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return err
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}
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writeConn.SetMaxOpenConns(1)
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writeConn.SetConnMaxIdleTime(30 * time.Second)
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writeConn.SetConnMaxLifetime(30 * time.Second)
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db.writeConn = writeConn
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readConn, err := sql.Open("sqlite3", db.path+"?mode=ro&_journal=WAL&_synchronous=NORMAL&_mode=ro")
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if err != nil {
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Error.Printf("%++v", err)
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return err
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}
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readConn.SetMaxOpenConns(4)
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readConn.SetConnMaxIdleTime(30 * time.Second)
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readConn.SetConnMaxLifetime(30 * time.Second)
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db.readConn = readConn
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db.Ready = true
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return nil
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}
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func (db *DB) Init(ddl string) error {
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if !db.Ready {
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return fmt.Errorf("database not ready")
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}
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var rows map[string]struct{} = make(map[string]struct{})
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var expected = map[string]struct{}{
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"price": {},
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}
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res, err := db.readConn.Query("SELECT name FROM sqlite_master WHERE type='table';")
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if err != nil {
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Error.Printf("%++v", err)
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return err
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}
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defer res.Close()
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for res.Next() {
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var name string
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err := res.Scan(&name)
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if err != nil {
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Error.Printf("%++v", err)
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return err
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}
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rows[name] = struct{}{}
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}
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var needsInit bool
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for table := range expected {
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if _, ok := rows[table]; !ok {
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log.Printf("Table %s not found, initializing", table)
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needsInit = true
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break
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}
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}
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if !needsInit {
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log.Printf("Database already initialized")
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return nil
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}
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_, err = db.writeConn.Exec(ddl)
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if err != nil {
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Error.Printf("%++v", err)
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log.Printf("%#v", "Rolling back")
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_, err2 := db.writeConn.Exec("ROLLBACK;")
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if err2 != nil {
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Error.Printf("Error rollingback! %++v", err)
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}
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return err
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}
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return nil
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}
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func (db *DB) Close() error {
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err := db.writeConn.Close()
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if err != nil {
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return err
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}
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err = db.readConn.Close()
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if 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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