wi/storage/storage.go

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/**
* @file storage.go
* @author Mikhail Klementyev jollheef<AT>riseup.net
* @license GNU GPLv3
* @date July, 2016
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* @brief Database functions
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*/
package storage
import (
"database/sql"
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"errors"
"reflect"
"strings"
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_ "github.com/mattn/go-sqlite3"
)
func OpenDB(path string) (db *sql.DB, err error) {
db, err = sql.Open("sqlite3", path)
if err != nil {
return
}
_, err = db.Exec("CREATE TABLE IF NOT EXISTS `links` " +
"( `id` INTEGER PRIMARY KEY AUTOINCREMENT, `url` TEXT );")
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if err != nil {
return
}
_, err = db.Exec("CREATE TABLE IF NOT EXISTS `history` " +
"( `id` INTEGER PRIMARY KEY AUTOINCREMENT, `url` TEXT );")
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if err != nil {
return
}
_, err = db.Exec("CREATE TABLE IF NOT EXISTS `fields` " +
"( `id` INTEGER PRIMARY KEY AUTOINCREMENT, " +
" `form_id` INTEGER, " +
" `hidden` BOOLEAN, " +
" `value` TEXT, " +
" `name` TEXT );")
if err != nil {
return
}
_, err = db.Exec("CREATE TABLE IF NOT EXISTS `forms` " +
"( `id` INTEGER PRIMARY KEY AUTOINCREMENT, " +
" `post` BOOLEAN, " +
" `url` TEXT );")
return
}
type Field struct {
Hidden bool
Value string
Name string
}
func getFields(db *sql.DB, formNo int64) (fields []Field, err error) {
stmt, err := db.Prepare("SELECT `hidden`, `value`, `name` FROM `fields` WHERE form_id=$1;")
if err != nil {
return
}
defer stmt.Close()
rows, err := stmt.Query(formNo)
if err != nil {
return
}
defer rows.Close()
for rows.Next() {
var f Field
err = rows.Scan(&f.Hidden, &f.Value, &f.Name)
if err != nil {
return
}
fields = append(fields, f)
}
return
}
func addField(db *sql.DB, name, value string, hidden bool, formNo int64) (err error) {
stmt, err := db.Prepare("INSERT INTO `fields` " +
"(`form_id`, `name`, `hidden`, `value`) VALUES ($1, $2, $3, $4);")
if err != nil {
return
}
defer stmt.Close()
_, err = stmt.Exec(formNo, name, hidden, value)
return
}
func AddForm(db *sql.DB, fields []Field, url, method string) (formNo int64, err error) {
stmt, err := db.Prepare("INSERT INTO `forms` (`url`, `post`) VALUES ($1, $2);")
if err != nil {
return
}
defer stmt.Close()
post := false // GET
if strings.ToUpper(method) == "POST" {
post = true
}
r, err := stmt.Exec(url, post)
if err != nil {
return
}
formNo, err = r.LastInsertId()
if err != nil {
return
}
for _, f := range fields {
addField(db, f.Name, f.Value, f.Hidden, formNo)
}
return
}
func GetFormID(db *sql.DB, fields []Field, url, method string) (formNo int64, err error) {
stmt, err := db.Prepare("SELECT `id` FROM `forms` WHERE url=$1 AND post=$2;")
if err != nil {
return
}
defer stmt.Close()
post := false // GET
if strings.ToUpper(method) == "POST" {
post = true
}
err = stmt.QueryRow(url, post).Scan(&formNo)
if err != nil {
return
}
dbFields, err := getFields(db, formNo)
if err != nil {
return
}
if !reflect.DeepEqual(fields, dbFields) {
err = errors.New("Fields not match")
return
}
return
}
func GetForm(db *sql.DB, formID int64) (fields []Field, url string, post bool, err error) {
stmt, err := db.Prepare("SELECT `post`, `url` FROM `forms` WHERE id=$1;")
if err != nil {
return
}
defer stmt.Close()
err = stmt.QueryRow(formID).Scan(&post, &url)
if err != nil {
return
}
fields, err = getFields(db, formID)
if err != nil {
return
}
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return
}
func AddLink(db *sql.DB, url string) (linkNo int64, err error) {
stmt, err := db.Prepare("INSERT INTO `links` (`url`) VALUES ($1);")
if err != nil {
return
}
defer stmt.Close()
r, err := stmt.Exec(url)
if err != nil {
return
}
linkNo, err = r.LastInsertId()
return
}
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func GetLink(db *sql.DB, linkID int64) (url string, err error) {
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stmt, err := db.Prepare("SELECT `url` FROM `links` WHERE id=$1;")
if err != nil {
return
}
defer stmt.Close()
err = stmt.QueryRow(linkID).Scan(&url)
return
}
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func GetLinkID(db *sql.DB, url string) (linkID int64, err error) {
stmt, err := db.Prepare("SELECT `id` FROM `links` WHERE url=$1;")
if err != nil {
return
}
defer stmt.Close()
err = stmt.QueryRow(url).Scan(&linkID)
return
}
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func AddHistoryURL(db *sql.DB, url string) (err error) {
stmt, err := db.Prepare("INSERT INTO `history` (`url`) VALUES ($1);")
if err != nil {
return
}
defer stmt.Close()
_, err = stmt.Exec(url)
return
}
type HistoryItem struct {
ID int64
URL string
}
func GetHistory(db *sql.DB) (history []HistoryItem, err error) {
rows, err := db.Query("SELECT `id`, `url` FROM `history`;")
if err != nil {
return
}
defer rows.Close()
for rows.Next() {
var h HistoryItem
err = rows.Scan(&h.ID, &h.URL)
if err != nil {
return
}
history = append(history, h)
}
return
}
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func GetHistoryUrl(db *sql.DB, historyID int64) (url string, err error) {
stmt, err := db.Prepare("SELECT `url` FROM `history` WHERE id=$1;")
if err != nil {
return
}
defer stmt.Close()
err = stmt.QueryRow(historyID).Scan(&url)
return
}