595 lines
12 KiB
Go
595 lines
12 KiB
Go
//TODO: Handle modified time
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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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"strings"
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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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DBCacheName = "memcache"
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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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QCreateLocalDbSchema = `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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QCreateMemDbSchema = `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 struct. All interactions with memory/buffer and
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// disk databases are 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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}
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func (db DB) New(name string, path string) *DB {
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return &DB{name, path, nil}
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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 sqlite database for read only operations
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func (db *DB) InitRO() {
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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 sqlite connection
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db.Handle, err = sql.Open("sqlite3", db.Path)
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log.Debugf("<%s> opened at <%s>", db.Name, db.Path)
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if err != nil {
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log.Critical(err)
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}
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}
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// Initialize a sqlite database with Gomark Schema
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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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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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if err != nil {
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log.Critical(err)
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}
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// Populate db schema
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tx, err := db.Handle.Begin()
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if err != nil {
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log.Error(err)
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}
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stmt, err := tx.Prepare(QCreateMemDbSchema)
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if err != nil {
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log.Error(err)
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}
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_, err = stmt.Exec()
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if err != nil {
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log.Error(err)
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}
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err = tx.Commit()
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if err != nil {
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log.Error(err)
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}
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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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if err != nil {
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log.Error(err)
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}
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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() error {
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log.Debugf("Closing DB <%s>", db.Name)
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err := db.Handle.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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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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if err != nil {
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log.Error(err)
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}
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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, tags string
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rows, err := db.Handle.Query("select url,tags from bookmarks")
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for rows.Next() {
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err = rows.Scan(&url, &tags)
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if err != nil {
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return err
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}
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log.Debugf("url:%s tags:%s", url, tags)
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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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// For ever row in `src` try to insert it into `dst`.
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// If if fails then try to update it. It means `src` is synced to `dst`
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func (src *DB) SyncTo(dst *DB) {
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log.Debugf("syncing <%s> to <%s>", src.Name, dst.Name)
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var sqlite3Err sqlite3.Error
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var existingUrls []*SBookmark
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getSourceTable, err := src.Handle.Prepare(`SELECT * FROM bookmarks`)
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defer getSourceTable.Close()
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if err != nil {
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log.Error(err)
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}
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getDstTags, err := dst.Handle.Prepare(
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`SELECT tags FROM bookmarks WHERE url=? LIMIT 1`,
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)
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defer getDstTags.Close()
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if err != nil {
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log.Error(err)
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}
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tryInsertDstRow, err := dst.Handle.Prepare(
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`INSERT INTO
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bookmarks(url, metadata, tags, desc, flags)
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VALUES (?, ?, ?, ?, ?)`,
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)
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defer tryInsertDstRow.Close()
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if err != nil {
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log.Error(err)
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}
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updateDstRow, err := dst.Handle.Prepare(
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`UPDATE bookmarks
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SET (metadata, tags, desc, modified, flags) = (?,?,?,strftime('%s'),?)
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WHERE url=?
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`,
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)
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defer updateDstRow.Close()
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if err != nil {
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log.Error(err)
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}
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srcTable, err := getSourceTable.Query()
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if err != nil {
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log.Error(err)
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}
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// Lock destination db
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dstTx, err := dst.Handle.Begin()
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if err != nil {
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log.Error(err)
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}
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// Start syncing all entries from source table
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for srcTable.Next() {
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// Fetch on row
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scan, err := ScanBookmarkRow(srcTable)
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if err != nil {
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log.Error(err)
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}
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// Try to insert to row in dst table
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_, err = dstTx.Stmt(tryInsertDstRow).Exec(
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scan.Url,
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scan.metadata,
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scan.tags,
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scan.desc,
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scan.flags,
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)
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if err != nil {
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sqlite3Err = err.(sqlite3.Error)
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}
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if err != nil && sqlite3Err.Code != sqlite3.ErrConstraint {
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log.Error(err)
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}
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// Record already exists in dst table, we need to use update
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// instead.
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if err != nil && sqlite3Err.Code == sqlite3.ErrConstraint {
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existingUrls = append(existingUrls, scan)
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}
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}
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err = dstTx.Commit()
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if err != nil {
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log.Error(err)
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}
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// Start a new transaction to update the existing urls
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dstTx, err = dst.Handle.Begin() // Lock dst db
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if err != nil {
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log.Error(err)
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}
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// Traverse existing urls and try an update this time
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for _, scan := range existingUrls {
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var tags string
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//log.Debugf("updating existing %s", scan.Url)
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row := getDstTags.QueryRow(
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scan.Url,
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)
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row.Scan(&tags)
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//log.Debugf("src tags: %v", scan.tags)
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//log.Debugf("dst tags: %v", dstTags)
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srcTags := strings.Split(scan.tags, TagJoinSep)
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dstTags := strings.Split(tags, TagJoinSep)
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tagMap := make(map[string]bool)
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for _, v := range srcTags {
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tagMap[v] = true
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}
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for _, v := range dstTags {
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tagMap[v] = true
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}
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var newTags []string //merged tags
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for k, _ := range tagMap {
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newTags = append(newTags, k)
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}
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_, err = dstTx.Stmt(updateDstRow).Exec(
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scan.metadata,
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strings.Join(newTags, TagJoinSep),
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scan.desc,
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0, //flags
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scan.Url,
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)
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if err != nil {
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log.Errorf("%s: %s", err, scan.Url)
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}
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}
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err = dstTx.Commit()
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if err != nil {
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log.Error(err)
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}
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// If we are syncing to memcache, sync cache to disk
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if dst.Name == DBCacheName {
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err = dst.SyncToDisk(getDBFullPath())
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if err != nil {
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log.Error(err)
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}
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}
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}
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// Copy from src DB to dst DB
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// Source DB os overwritten
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func (src *DB) CopyTo(dst *DB) {
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log.Debugf("Copying <%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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if err != nil {
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log.Error(err)
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}
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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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if err != nil {
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log.Error(err)
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}
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dstDb.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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log.Error(err)
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}
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_, err = bk.Step(-1)
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if err != nil {
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log.Error(err)
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}
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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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log.Debugf("Syncing <%s> to <%s>", src.Name, dbpath)
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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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// Struct represetning the schema of `bookmarks` db.
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// The order in the struct respects the columns order
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type SBookmark struct {
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id int
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Url string
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metadata string
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tags string
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desc string
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modified int64
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flags int
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}
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// Scans a row into `SBookmark` schema
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func ScanBookmarkRow(row *sql.Rows) (*SBookmark, error) {
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scan := new(SBookmark)
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err := row.Scan(
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&scan.id,
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&scan.Url,
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&scan.metadata,
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&scan.tags,
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&scan.desc,
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&scan.modified,
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&scan.flags,
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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 scan, nil
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}
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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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cachePath := fmt.Sprintf(DBMemcacheFmt, DBCacheName)
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CacheDB = DB{}.New(DBCacheName, 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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if err != nil {
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log.Critical(err)
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}
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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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if err != nil {
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log.Warning(err)
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}
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log.Infof("<%s> exists, preloading to cache", dbpath)
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CacheDB.SyncFromDisk(dbpath)
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//CacheDB.Print()
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} else {
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if err != nil {
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log.Error(err)
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}
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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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|
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//Initialize the local database file
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func initLocalDB(db *DB, dbpath string) {
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|
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log.Infof("Initializing local db at '%s'", dbpath)
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err := db.SyncToDisk(dbpath)
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if err != nil {
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log.Critical(err)
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}
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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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