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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 (
"encoding/base32"
"fmt"
"github.com/satori/go.uuid"
"strings"
)
type Session struct {
ImportContext
ImportResult
// TODO: add creation time for timeout
}
type ProgressData struct {
step int
step_name string
progress float64
userdata interface{}
}
type newSessionResponse struct {
id string
err error
}
type newSessionRequest struct {
ctx ImportContext
response chan newSessionResponse
}
type sessionRunResponse struct {
err error
}
type sessionRunRequest struct {
user string
id string
response chan<- sessionRunResponse
}
type sessionAddProgressHandlerResponse struct {
err error
}
type sessionAddProgressHandlerRequest struct {
user string
id string
userdata interface{}
handler chan<- ProgressData
response chan<- sessionAddProgressHandlerResponse
}
type sessionAddDoneHandlerResponse struct {
err error
}
type sessionAddDoneHandlerRequest struct {
user string
id string
userdata interface{}
handler chan<- ImportResult
response chan<- sessionAddDoneHandlerResponse
}
type sessionRemoveResponse struct {
err error
}
type sessionRemoveRequest struct {
user string
id string
response chan sessionRemoveResponse
}
type SessionStore struct {
store map[string]map[string]Session
quit chan bool
done chan bool
newChan chan newSessionRequest
runChan chan sessionRunRequest
addProgressChan chan sessionAddProgressHandlerRequest
addDoneChan chan sessionAddDoneHandlerRequest
removeChan chan sessionRemoveRequest
}
func (self *SessionStore) Init() (err error) {
return
}
func (self *SessionStore) newSession(ctx ImportContext) (resp newSessionResponse) {
b := uuid.NewV4().Bytes()
resp.id = strings.ToLower(strings.TrimRight(base32.StdEncoding.EncodeToString(b), "="))
if _, exists := self.store[ctx.UserName]; !exists {
self.store[ctx.UserName] = make(map[string]Session)
}
self.store[ctx.UserName][resp.id] = Session{ImportContext: ctx}
rhdl.Printf("SessionStore: created session for '%s' -> %s", ctx.UserName, resp.id)
return
}
func (self *SessionStore) NewSession(ctx ImportContext) (string, error) {
res_ch := make(chan newSessionResponse)
req := newSessionRequest{}
req.ctx = ctx
req.response = res_ch
self.newChan <- req
res := <-res_ch
if res.err != nil {
return "", res.err
}
return res.id, nil
}
func (self *SessionStore) run(user, id string) (resp sessionRunResponse) {
if _, exists := self.store[user][id]; exists {
rhdl.Printf("SessionStore: running session '%s/%s'", user, id)
} else {
resp.err = fmt.Errorf("SessionStore: session '%s/%s' not found", user, id)
}
return
}
func (self *SessionStore) Run(user, id string) error {
res_ch := make(chan sessionRunResponse)
req := sessionRunRequest{}
req.user = user
req.id = id
req.response = res_ch
self.runChan <- req
res := <-res_ch
return res.err
}
func (self *SessionStore) addProgressHandler(user, id string, userdata interface{}, handler chan<- ProgressData) (resp sessionAddProgressHandlerResponse) {
if _, exists := self.store[user][id]; exists {
rhdl.Printf("SessionStore: adding progress handler to '%s/%s'", user, id)
} else {
resp.err = fmt.Errorf("SessionStore: session '%s/%s' not found", user, id)
}
return
}
func (self *SessionStore) AddProgressHandler(user, id string, userdata interface{}, handler chan<- ProgressData) error {
res_ch := make(chan sessionAddProgressHandlerResponse)
req := sessionAddProgressHandlerRequest{}
req.user = user
req.id = id
req.userdata = userdata
req.handler = handler
req.response = res_ch
self.addProgressChan <- req
res := <-res_ch
return res.err
}
func (self *SessionStore) addDoneHandler(user, id string, userdata interface{}, handler chan<- ImportResult) (resp sessionAddDoneHandlerResponse) {
if _, exists := self.store[user][id]; exists {
rhdl.Printf("SessionStore: adding done handler to '%s/%s'", user, id)
} else {
resp.err = fmt.Errorf("SessionStore: session '%s/%s' not found", user, id)
}
return
}
func (self *SessionStore) AddDoneHandler(user, id string, userdata interface{}, handler chan<- ImportResult) error {
res_ch := make(chan sessionAddDoneHandlerResponse)
req := sessionAddDoneHandlerRequest{}
req.user = user
req.id = id
req.userdata = userdata
req.handler = handler
req.response = res_ch
self.addDoneChan <- req
res := <-res_ch
return res.err
}
func (self *SessionStore) remove(user, id string) (resp sessionRemoveResponse) {
if _, exists := self.store[user][id]; exists {
delete(self.store[user], id)
rhdl.Printf("SessionStore: removed session '%s/%s'", user, id)
if _, exists := self.store[user]; exists {
if len(self.store[user]) == 0 {
delete(self.store, user)
rhdl.Printf("SessionStore: removed user '%s'", user)
}
}
} else {
resp.err = fmt.Errorf("SessionStore: session '%s/%s' not found", user, id)
}
return
}
func (self *SessionStore) Remove(user, id string) error {
res_ch := make(chan sessionRemoveResponse)
req := sessionRemoveRequest{}
req.user = user
req.id = id
req.response = res_ch
self.removeChan <- req
res := <-res_ch
return res.err
}
func (self *SessionStore) dispatchRequests() {
defer func() { self.done <- true }()
for {
select {
case <-self.quit:
return
case req := <-self.newChan:
req.response <- self.newSession(req.ctx)
case req := <-self.runChan:
req.response <- self.run(req.user, req.id)
case req := <-self.addProgressChan:
req.response <- self.addProgressHandler(req.user, req.id, req.userdata, req.handler)
case req := <-self.addDoneChan:
req.response <- self.addDoneHandler(req.user, req.id, req.userdata, req.handler)
case req := <-self.removeChan:
req.response <- self.remove(req.user, req.id)
}
}
}
func (self *SessionStore) Cleanup() {
self.quit <- true
<-self.done
close(self.quit)
close(self.done)
close(self.newChan)
close(self.runChan)
close(self.addProgressChan)
close(self.addDoneChan)
close(self.removeChan)
}
func NewSessionStore(conf *Config) (store *SessionStore, err error) {
store = new(SessionStore)
store.quit = make(chan bool)
store.done = make(chan bool)
store.store = make(map[string]map[string]Session)
store.newChan = make(chan newSessionRequest)
store.runChan = make(chan sessionRunRequest)
store.addProgressChan = make(chan sessionAddProgressHandlerRequest)
store.addDoneChan = make(chan sessionAddDoneHandlerRequest)
store.removeChan = make(chan sessionRemoveRequest)
go store.dispatchRequests()
return
}
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