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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 RDDB struct {
dbh *sql.DB
password_cache map[string]string
getPasswordChan chan getPasswordRequest
dbGetPasswordStmt *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.dbGetPasswordStmt, err = self.dbh.Prepare("select PASSWORD from USERS where LOGIN_NAME = ?"); 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.dbGetPasswordStmt.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) 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}
}
}
}
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.dbGetPasswordStmt != nil {
self.dbGetPasswordStmt.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)
if err = db.init(conf); err != nil {
return
}
go db.dispatchRequests()
return
}
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