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//
// rhimportd
//
// The Radio Helsinki Rivendell Import Daemon
//
//
// Copyright (C) 2015 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhimportd.
//
// rhimportd 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.
//
// rhimportd 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 rhimportd. If not, see <http://www.gnu.org/licenses/>.
//
package rhimport
import (
"database/sql"
"fmt"
_ "github.com/go-sql-driver/mysql"
)
type getPasswordResult struct {
password string
err error
}
type getPasswordRequest struct {
username string
cached bool
response chan getPasswordResult
}
type getGroupOfCartResult struct {
group string
err error
}
type getGroupOfCartRequest struct {
cart uint
response chan getGroupOfCartResult
}
type getShowInfoResult struct {
title string
carts map[int]int
err error
}
type getShowInfoRequest struct {
showid int
response chan getShowInfoResult
}
type RdDb struct {
dbh *sql.DB
password_cache map[string]string
getPasswordChan chan getPasswordRequest
getPasswordStmt *sql.Stmt
getGroupOfCartChan chan getGroupOfCartRequest
getGroupOfCartStmt *sql.Stmt
getShowInfoChan chan getShowInfoRequest
getShowInfoStmt *sql.Stmt
quit chan bool
done chan bool
}
func (self *RdDb) init(conf *Config) (err error) {
dsn := fmt.Sprintf("%s:%s@tcp(%s:3306)/%s", conf.db_user, conf.db_passwd, conf.db_host, conf.db_db)
if self.dbh, err = sql.Open("mysql", dsn); err != nil {
return
}
if self.getPasswordStmt, err = self.dbh.Prepare("select PASSWORD from USERS where LOGIN_NAME = ?;"); err != nil {
return
}
if self.getGroupOfCartStmt, err = self.dbh.Prepare("select NAME,DEFAULT_LOW_CART,DEFAULT_HIGH_CART from GROUPS where DEFAULT_LOW_CART <= ? and DEFAULT_HIGH_CART >= ?;"); err != nil {
return
}
if self.getShowInfoStmt, err = self.dbh.Prepare("select TITLE,MACROS from CART where NUMBER = ?;"); err != nil {
return
}
return
}
func (self *RdDb) getPassword(username string, cached bool) (pwd string, err error) {
if cached {
pwd = self.password_cache[username]
}
if pwd == "" {
err = self.getPasswordStmt.QueryRow(username).Scan(&pwd)
if err != nil {
if err == sql.ErrNoRows {
err = fmt.Errorf("user '%s' not known by rivendell", username)
}
return
}
self.password_cache[username] = pwd
}
return
}
func (self *RdDb) getGroupOfCart(cart uint) (group string, err error) {
var rows *sql.Rows
if rows, err = self.getGroupOfCartStmt.Query(cart, cart); err != nil {
return
}
defer rows.Close()
size_min := ^uint(0)
for rows.Next() {
var name string
var low_cart, high_cart uint
if err = rows.Scan(&name, &low_cart, &high_cart); err != nil {
return
}
if high_cart >= low_cart {
size := (high_cart - low_cart) + 1
if size_min > size {
group = name
size_min = size
}
}
}
if err = rows.Err(); err != nil {
return
}
if group == "" {
err = fmt.Errorf("cart is outside of all group cart ranges")
}
return
}
func (self *RdDb) getShowInfo(showid int) (title string, carts map[int]int, err error) {
var macros string
err = self.getShowInfoStmt.QueryRow(showid).Scan(&title, ¯os)
if err != nil {
if err == sql.ErrNoRows {
err = fmt.Errorf("show '%d' not found", showid)
}
return
}
rhdl.Printf("RdDb: macros for showid '%d' are set to '%s'", showid, macros)
// TODO: also fetch cart list
carts = make(map[int]int)
return
}
func (self *RdDb) dispatchRequests() {
defer func() { self.done <- true }()
for {
select {
case <-self.quit:
return
case req := <-self.getPasswordChan:
if req.cached {
rhdl.Println("RdDb: got getPassword request for", req.username, "(cached)")
} else {
rhdl.Println("RdDb: got getPassword request for", req.username, "(not cached)")
}
pwd, err := self.getPassword(req.username, req.cached)
req.response <- getPasswordResult{pwd, err}
case req := <-self.getGroupOfCartChan:
rhdl.Println("RdDb: got getGroupOfCart request for", req.cart)
group, err := self.getGroupOfCart(req.cart)
req.response <- getGroupOfCartResult{group, err}
case req := <-self.getShowInfoChan:
rhdl.Println("RdDb: got getShowInfo request for", req.showid)
title, carts, err := self.getShowInfo(req.showid)
req.response <- getShowInfoResult{title, carts, err}
}
}
}
func (self *RdDb) Cleanup() {
self.quit <- true
<-self.done
close(self.quit)
close(self.done)
close(self.getPasswordChan)
if self.dbh != nil {
self.dbh.Close()
}
if self.getPasswordStmt != nil {
self.getPasswordStmt.Close()
}
if self.getGroupOfCartStmt != nil {
self.getGroupOfCartStmt.Close()
}
if self.getShowInfoStmt != nil {
self.getPasswordStmt.Close()
}
}
func NewRdDb(conf *Config) (db *RdDb, err error) {
db = new(RdDb)
db.quit = make(chan bool)
db.done = make(chan bool)
db.password_cache = make(map[string]string)
db.getPasswordChan = make(chan getPasswordRequest)
db.getGroupOfCartChan = make(chan getGroupOfCartRequest)
db.getShowInfoChan = make(chan getShowInfoRequest)
if err = db.init(conf); err != nil {
return
}
go db.dispatchRequests()
return
}
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