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//
// pool-import
//
// Copyright (C) 2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of pool-import.
//
// pool-import is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// pool-import is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with pool-import. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"database/sql"
"fmt"
"regexp"
"strconv"
"strings"
"time"
"github.com/ziutek/mymysql/godrv"
)
var (
mysqlTableNameRe = regexp.MustCompile(`^[_0-9a-zA-Z-]+$`)
)
const (
DB_VERSION = 182
defaultCartTitle = "[new cart]"
)
type CutListEntry struct {
Number uint
Evergreen bool
Description string
Duration time.Duration
Imported NullTime
NumPlayed uint
LastPlayed NullTime
}
type CartListEntry struct {
Number uint
Exists bool
Artist string
Title string
Album string
Cuts []CutListEntry
}
type PoolListEntry struct {
Group string
Description string
}
type getPoolCartListResult struct {
carts map[uint]CartListEntry
err error
}
type getPoolCartListRequest struct {
pool PoolListEntry
response chan<- getPoolCartListResult
}
type db struct {
conf *config
dbh *sql.DB
getPoolCartListChan chan getPoolCartListRequest
getPoolCartsStmt *sql.Stmt
quit chan bool
done chan bool
}
func (d *db) init() (err error) {
godrv.Register("SET CHARACTER SET utf8;")
dsn := fmt.Sprintf("tcp:%s:3306*%s/%s/%s", d.conf.dbHost, d.conf.dbDb, d.conf.dbUser, d.conf.dbPasswd)
if d.dbh, err = sql.Open("mymysql", dsn); err != nil {
return
}
var dbver int
err = d.dbh.QueryRow("select DB from VERSION;").Scan(&dbver)
if err != nil {
err = fmt.Errorf("fetching version: %s", err)
return
}
if dbver != DB_VERSION {
err = fmt.Errorf("version mismatch is %d, should be %d", dbver, DB_VERSION)
return
}
if d.getPoolCartsStmt, err = d.dbh.Prepare("select CART.NUMBER,CART.ARTIST,CART.TITLE,CART.ALBUM,CUTS.CUT_NAME,CUTS.EVERGREEN,CUTS.DESCRIPTION,CUTS.LENGTH,CUTS.ORIGIN_DATETIME,CUTS.PLAY_COUNTER,CUTS.LAST_PLAY_DATETIME from CUTS,CART where CUTS.CART_NUMBER = CART.NUMBER and CART.GROUP_NAME = ?;"); err != nil {
return
}
return
}
func (d *db) getPoolCartList(pool PoolListEntry) (result getPoolCartListResult) {
var rows *sql.Rows
if rows, result.err = d.getPoolCartsStmt.Query(pool.Group); result.err != nil {
return
}
defer rows.Close()
result.carts = make(map[uint]CartListEntry)
for rows.Next() {
var cut CutListEntry
var cart, length uint
var cutName, evergreen string
var artist, title, album sql.NullString
if result.err = rows.Scan(&cart, &artist, &title, &album, &cutName, &evergreen, &cut.Description, &length, &cut.Imported, &cut.NumPlayed, &cut.LastPlayed); result.err != nil {
return
}
parts := strings.Split(cutName, "_")
if len(parts) == 2 {
if cn, converr := strconv.ParseUint(parts[1], 10, 32); converr != nil {
continue
} else {
cut.Number = uint(cn)
}
} else {
continue
}
switch evergreen {
case "Y":
cut.Evergreen = true
default:
cut.Evergreen = false
}
cut.Duration = time.Duration(length) * time.Millisecond
if c, exists := result.carts[cart]; !exists {
c = CartListEntry{cart, true, artist.String, title.String, album.String, nil}
c.Cuts = append(c.Cuts, cut)
result.carts[cart] = c
} else {
c.Cuts = append(c.Cuts, cut)
}
}
result.err = rows.Err()
return
}
func (d *db) dispatchRequests() {
defer func() { d.done <- true }()
for {
select {
case <-d.quit:
return
case req := <-d.getPoolCartListChan:
req.response <- d.getPoolCartList(req.pool)
}
}
}
// *********************************************************
// Public Interface
type DB struct {
getPoolCartListChan chan<- getPoolCartListRequest
}
func (d *DB) GetPoolCartList(pool PoolListEntry) (map[uint]CartListEntry, error) {
resCh := make(chan getPoolCartListResult)
req := getPoolCartListRequest{}
req.pool = pool
req.response = resCh
d.getPoolCartListChan <- req
res := <-resCh
if res.err != nil {
return nil, res.err
}
return res.carts, nil
}
func (d *db) GetInterface() *DB {
ch := &DB{}
ch.getPoolCartListChan = d.getPoolCartListChan
return ch
}
func (d *db) Cleanup() {
d.quit <- true
<-d.done
close(d.quit)
close(d.done)
if d.dbh != nil {
d.dbh.Close()
}
if d.getPoolCartsStmt != nil {
d.getPoolCartsStmt.Close()
}
}
func NewDB(configfile string) (d *db, err error) {
d = new(db)
if d.conf, err = newConfig(configfile); err != nil {
return
}
d.quit = make(chan bool)
d.done = make(chan bool)
d.getPoolCartListChan = make(chan getPoolCartListRequest, 10)
if err = d.init(); err != nil {
return
}
go d.dispatchRequests()
return
}
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