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database.go
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database.go
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package browsers
import (
"database/sql"
)
// Database sql wrapper for operations with browser objects.
type Database struct {
db *sql.DB
}
// Close closes database.
func (db Database) Close() error {
return db.db.Close()
}
func NewDB(db *sql.DB) *Database {
return &Database{db: db}
}
type Browser struct {
ID string `json:"browser-id"`
Name string `json:"name"`
Timestamp uint64 `json:"timestamp"`
Dapp bool `json:"dapp?"`
HistoryIndex int `json:"history-index"`
History []string `json:"history,omitempty"`
}
func (db *Database) InsertBrowser(browser Browser) (err error) {
var (
tx *sql.Tx
insert *sql.Stmt
)
tx, err = db.db.Begin()
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
_ = tx.Rollback()
}()
insert, err = tx.Prepare("INSERT OR REPLACE INTO browsers(id, name, timestamp, dapp, historyIndex) VALUES(?, ?, ?, ?, ?)")
if err != nil {
return
}
_, err = insert.Exec(browser.ID, browser.Name, browser.Timestamp, browser.Dapp, browser.HistoryIndex)
insert.Close()
if err != nil {
return
}
if len(browser.History) == 0 {
return
}
insert, err = tx.Prepare("INSERT INTO browsers_history(browser_id, history) VALUES(?, ?)")
if err != nil {
return
}
defer insert.Close()
for _, history := range browser.History {
_, err = insert.Exec(browser.ID, history)
if err != nil {
return
}
}
return
}
func (db *Database) GetBrowsers() (rst []*Browser, err error) {
var (
tx *sql.Tx
rows *sql.Rows
)
tx, err = db.db.Begin()
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
_ = tx.Rollback()
}()
// FULL and RIGHT joins are not supported
rows, err = tx.Query("SELECT id, name, timestamp, dapp, historyIndex FROM browsers ORDER BY timestamp DESC")
if err != nil {
return
}
browsers := map[string]*Browser{}
for rows.Next() {
browser := Browser{}
err = rows.Scan(&browser.ID, &browser.Name, &browser.Timestamp, &browser.Dapp, &browser.HistoryIndex)
if err != nil {
return nil, err
}
browsers[browser.ID] = &browser
rst = append(rst, &browser)
}
rows, err = tx.Query("SELECT browser_id, history from browsers_history")
if err != nil {
return
}
var (
id string
history string
)
for rows.Next() {
err = rows.Scan(&id, &history)
if err != nil {
return
}
browsers[id].History = append(browsers[id].History, history)
}
return rst, nil
}
func (db *Database) DeleteBrowser(id string) error {
_, err := db.db.Exec("DELETE from browsers WHERE id = ?", id)
return err
}