354 lines
7.2 KiB
Go
354 lines
7.2 KiB
Go
package main
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import (
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"database/sql"
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"errors"
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"fmt"
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"path/filepath"
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_ "github.com/mattn/go-sqlite3"
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sqlite3 "github.com/mattn/go-sqlite3"
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)
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// Global cache database
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var (
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cacheDB *DB // Main in memory db, is synced with disc
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_sql3conns []*sqlite3.SQLiteConn // Only used for backup hook
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backupHookRegistered bool // set to true once the backup hook is registered
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)
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const (
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DB_FILENAME = "gomarks.db"
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DBMemcacheFmt = "file:%s?mode=memory&cache=shared"
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DBBufferFmt = "file:%s?mode=memory&cache=shared"
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DB_BACKUP_HOOK = "sqlite_with_backup"
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)
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// Database schemas used for the creation of new databases
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const (
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// metadata: name or title of resource
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CREATE_LOCAL_DB_SCHEMA = `CREATE TABLE if not exists bookmarks (
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id integer PRIMARY KEY,
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URL text NOT NULL UNIQUE,
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metadata text default '',
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tags text default '',
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desc text default '',
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modified integer default ?,
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flags integer default 0
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)`
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CREATE_MEM_DB_SCHEMA = `CREATE TABLE if not exists bookmarks (
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id integer PRIMARY KEY,
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URL text NOT NULL UNIQUE,
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metadata text default '',
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tags text default '',
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desc text default '',
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modified integer default (strftime('%s')),
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flags integer default 0
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)`
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)
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// DB encapsulates an sql.DB
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// all itneractions with memory/buffer and disk databases
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// is done through the DB object
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type DB struct {
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name string
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path string
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handle *sql.DB
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backupHookOn bool
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}
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func (db DB) New(name string, path string) *DB {
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return &DB{name, path, nil, false}
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}
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func (db *DB) Error() string {
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errMsg := fmt.Sprintf("[error][db] name <%s>", db.name)
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return errMsg
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}
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// Initialize a sqlite database
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func (db *DB) Init() {
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// TODO: Use context when making call from request/api
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// `cacheDB` is a memory replica of disk db
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// `bufferDB` is current working job db
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var err error
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if db.handle != nil {
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logErrorMsg(db, "already initialized")
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return
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}
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// Create the memory cache db
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db.handle, err = sql.Open("sqlite3", db.path)
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//log.Debugf("db <%s> opend at at <%s>", db.name, db.path)
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log.Debugf("<%s> opened at <%s>", db.name, db.path)
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logPanic(err)
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// Populate db schema
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tx, err := db.handle.Begin()
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logPanic(err)
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stmt, err := tx.Prepare(CREATE_MEM_DB_SCHEMA)
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logPanic(err)
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_, err = stmt.Exec()
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logPanic(err)
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err = tx.Commit()
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logPanic(err)
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if !backupHookRegistered {
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//log.Debugf("backup_hook: registering driver %s", DB_BACKUP_HOOK)
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// Register the hook
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sql.Register(DB_BACKUP_HOOK,
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&sqlite3.SQLiteDriver{
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ConnectHook: func(conn *sqlite3.SQLiteConn) error {
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//log.Debugf("[HOOK] registering new connection")
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_sql3conns = append(_sql3conns, conn)
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//log.Debugf("%v", _sql3conns)
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return nil
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},
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})
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backupHookRegistered = true
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}
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log.Debugf("<%s> initialized", db.name)
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}
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func (db *DB) Attach(attached *DB) {
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stmtStr := fmt.Sprintf("ATTACH DATABASE '%s' AS '%s'", attached.path, attached.name)
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_, err := db.handle.Exec(stmtStr)
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logPanic(err)
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/////////////////
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// For debug only
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/////////////////
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//var idx int
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//var dt string
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//var name string
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//rows, err := db.handle.Query("PRAGMA database_list;")
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//logPanic(err)
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//for rows.Next() {
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//err = rows.Scan(&idx, &dt, &name)
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//logPanic(err)
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//log.Debugf("pragmalist: %s", dt)
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//}
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}
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func (db *DB) Close() {
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log.Debugf("Closing <%s>", db.name)
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db.handle.Close()
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}
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func (db *DB) Count() int {
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var count int
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row := db.handle.QueryRow("select count(*) from bookmarks")
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err := row.Scan(&count)
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logPanic(err)
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return count
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}
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func (db *DB) Print() error {
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var url string
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rows, err := db.handle.Query("select url from bookmarks")
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for rows.Next() {
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err = rows.Scan(&url)
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if err != nil {
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return err
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}
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log.Debugf("%s", url)
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}
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return nil
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}
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func (db *DB) isEmpty() (bool, error) {
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var count int
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row := db.handle.QueryRow("select count(*) from bookmarks")
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err := row.Scan(&count)
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if err != nil {
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return false, err
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}
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if count > 0 {
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return false, nil
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}
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return true, nil
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}
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func (src *DB) SyncTo(dst *DB) {
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log.Debugf("Syncing <%s>(%d) to <%s>(%d)", src.name,
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src.Count(),
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dst.name,
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dst.Count())
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srcDb, err := sql.Open(DB_BACKUP_HOOK, src.path)
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defer func() {
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srcDb.Close()
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_sql3conns = _sql3conns[:len(_sql3conns)-1]
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}()
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logPanic(err)
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srcDb.Ping()
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dstDb, err := sql.Open(DB_BACKUP_HOOK, dst.path)
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defer func() {
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dstDb.Close()
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_sql3conns = _sql3conns[:len(_sql3conns)-1]
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}()
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logPanic(err)
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dstDb.Ping()
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bk, err := _sql3conns[1].Backup("main", _sql3conns[0], "main")
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logPanic(err)
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_, err = bk.Step(-1)
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logPanic(err)
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bk.Finish()
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}
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func (src *DB) SyncToDisk(dbpath string) error {
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if !backupHookRegistered {
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errMsg := fmt.Sprintf("%s, %s", src.path, "db backup hook is not initialized")
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return errors.New(errMsg)
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}
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//log.Debugf("[flush] openeing <%s>", src.path)
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srcDb, err := sql.Open(DB_BACKUP_HOOK, src.path)
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defer flushSqliteCon(srcDb)
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if err != nil {
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return err
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}
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srcDb.Ping()
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//log.Debugf("[flush] opening <%s>", DB_FILENAME)
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dbUri := fmt.Sprintf("file:%s", dbpath)
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bkDb, err := sql.Open(DB_BACKUP_HOOK, dbUri)
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defer flushSqliteCon(bkDb)
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if err != nil {
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return err
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}
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bkDb.Ping()
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bk, err := _sql3conns[1].Backup("main", _sql3conns[0], "main")
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if err != nil {
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return err
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}
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_, err = bk.Step(-1)
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if err != nil {
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return err
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}
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bk.Finish()
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return nil
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}
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func (dst *DB) SyncFromDisk(dbpath string) error {
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if !backupHookRegistered {
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errMsg := fmt.Sprintf("%s, %s", dst.path, "db backup hook is not initialized")
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return errors.New(errMsg)
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}
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log.Debugf("Syncing <%s> to <%s>", dbpath, dst.name)
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dbUri := fmt.Sprintf("file:%s", dbpath)
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srcDb, err := sql.Open(DB_BACKUP_HOOK, dbUri)
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defer flushSqliteCon(srcDb)
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if err != nil {
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return err
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}
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srcDb.Ping()
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//log.Debugf("[flush] opening <%s>", DB_FILENAME)
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bkDb, err := sql.Open(DB_BACKUP_HOOK, dst.path)
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defer flushSqliteCon(bkDb)
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if err != nil {
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return err
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}
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bkDb.Ping()
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bk, err := _sql3conns[1].Backup("main", _sql3conns[0], "main")
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if err != nil {
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return err
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}
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_, err = bk.Step(-1)
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if err != nil {
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return err
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}
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bk.Finish()
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return nil
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}
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// TODO: Use context when making call from request/api
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func initDB() {
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// Initialize memory db with schema
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cacheName := "memcache"
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cachePath := fmt.Sprintf(DBMemcacheFmt, cacheName)
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cacheDB = DB{}.New(cacheName, cachePath)
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cacheDB.Init()
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// Check and initialize local db as last step
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// browser bookmarks should already be in cache
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dbdir := getDefaultDBPath()
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dbpath := filepath.Join(dbdir, DB_FILENAME)
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// Verifiy that local db directory path is writeable
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err := checkWriteable(dbdir)
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logPanic(err)
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// If local db exists load it to cacheDB
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var exists bool
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if exists, err = checkFileExists(dbpath); exists {
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logPanic(err)
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log.Debugf("localdb exists, preloading to cache")
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cacheDB.SyncFromDisk(dbpath)
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//_ = cacheDB.Print()
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} else {
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logPanic(err)
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// Else initialize it
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initLocalDB(cacheDB, dbpath)
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}
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}
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//Initialize the local database file
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func initLocalDB(db *DB, dbpath string) {
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log.Infof("Initializing local db at '%s'", dbpath)
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log.Debugf("%s flushing to disk", db.name)
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err := db.SyncToDisk(dbpath)
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logPanic(err)
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}
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func flushSqliteCon(con *sql.DB) {
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con.Close()
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_sql3conns = _sql3conns[:len(_sql3conns)-1]
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log.Debugf("Flushed sqlite conns %v", _sql3conns)
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}
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