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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 (
"net/http"
)
const (
SESSION_NEW = iota
SESSION_RUNNING
SESSION_CANCELED
SESSION_DONE
)
type SessionChan struct {
runChan chan<- bool
cancelChan chan<- bool
addProgressChan chan<- sessionAddProgressHandlerRequest
addDoneChan chan<- sessionAddDoneHandlerRequest
}
type Session struct {
ctx ImportContext
state int
done chan bool
cancelIntChan chan bool
progressIntChan chan ProgressData
doneIntChan chan ImportResult
runChan chan bool
cancelChan chan bool
addProgressChan chan sessionAddProgressHandlerRequest
addDoneChan chan sessionAddDoneHandlerRequest
// TODO: add pub/sub for progress and done
}
type ProgressData struct {
step int
step_name string
progress float64
}
type sessionAddProgressHandlerResponse struct {
err error
}
type sessionAddProgressHandlerRequest struct {
userdata interface{}
callback ImportProgressCB
response chan<- sessionAddProgressHandlerResponse
}
type sessionAddDoneHandlerResponse struct {
err error
}
type sessionAddDoneHandlerRequest struct {
userdata interface{}
callback func(*ImportResult, interface{})
response chan<- sessionAddDoneHandlerResponse
}
func session_progress_callback(step int, step_name string, progress float64, userdata interface{}) {
out := userdata.(chan<- ProgressData)
out <- ProgressData{step, step_name, progress}
}
func session_import_run(ctx ImportContext, done chan<- ImportResult) {
if err := ctx.SanityCheck(); err != nil {
done <- ImportResult{http.StatusBadRequest, err.Error(), 0, 0}
return
}
if res, err := FetchFile(&ctx); err != nil {
done <- ImportResult{http.StatusInternalServerError, err.Error(), 0, 0}
return
} else if res.ResponseCode != http.StatusOK {
done <- ImportResult{res.ResponseCode, res.ErrorString, 0, 0}
return
}
if res, err := ImportFile(&ctx); err != nil {
done <- ImportResult{http.StatusInternalServerError, err.Error(), 0, 0}
return
} else {
done <- *res
return
}
}
func (self *Session) run() {
self.ctx.ProgressCallBack = session_progress_callback
self.ctx.ProgressCallBackData = (chan<- ProgressData)(self.progressIntChan)
self.ctx.Cancel = self.cancelIntChan
go session_import_run(self.ctx, self.doneIntChan)
self.state = SESSION_RUNNING
return
}
func (self *SessionChan) Run() {
self.runChan <- true
}
func (self *SessionChan) Cancel() {
self.cancelChan <- true
}
func (self *Session) addProgressHandler(userdata interface{}, cb ImportProgressCB) (resp sessionAddProgressHandlerResponse) {
rhdl.Printf("Session: addProgressHandler called with: %+v", userdata)
return
}
func (self *SessionChan) AddProgressHandler(userdata interface{}, cb ImportProgressCB) error {
res_ch := make(chan sessionAddProgressHandlerResponse)
req := sessionAddProgressHandlerRequest{}
req.userdata = userdata
req.callback = cb
req.response = res_ch
self.addProgressChan <- req
res := <-res_ch
return res.err
}
func (self *Session) addDoneHandler(userdata interface{}, cb func(*ImportResult, interface{})) (resp sessionAddDoneHandlerResponse) {
rhdl.Printf("Session: addDoneHandler called with: %+v", userdata)
return
}
func (self *SessionChan) AddDoneHandler(userdata interface{}, cb func(*ImportResult, interface{})) error {
res_ch := make(chan sessionAddDoneHandlerResponse)
req := sessionAddDoneHandlerRequest{}
req.userdata = userdata
req.callback = cb
req.response = res_ch
self.addDoneChan <- req
res := <-res_ch
return res.err
}
func (self *Session) dispatchRequests() {
defer func() { self.done <- true }()
for {
select {
case <-self.runChan:
if self.state == SESSION_NEW {
self.run()
}
case <-self.cancelChan:
if self.state == SESSION_RUNNING {
rhdl.Println("Session: canceling running import")
select {
case self.cancelIntChan <- true:
default: // session got canceled already
}
} else {
return
}
case req := <-self.addProgressChan:
req.response <- self.addProgressHandler(req.userdata, req.callback)
case req := <-self.addDoneChan:
req.response <- self.addDoneHandler(req.userdata, req.callback)
case progress := <-self.progressIntChan:
rhdl.Printf("Session: got progress: %+v", progress)
// TODO: call all subscribed progress handler
case result := <-self.doneIntChan:
self.state = SESSION_DONE
rhdl.Printf("Session: import is done: %+v", result)
// TODO: call all subscribed done handler
}
}
}
func (self *Session) getInterface() *SessionChan {
ch := &SessionChan{}
ch.runChan = self.runChan
ch.cancelChan = self.cancelChan
ch.addProgressChan = self.addProgressChan
ch.addDoneChan = self.addDoneChan
return ch
}
func (self *Session) Cleanup() {
self.cancelChan <- true
rhdl.Printf("waiting for session to close")
<-self.done
close(self.done)
close(self.progressIntChan)
close(self.doneIntChan)
close(self.runChan)
close(self.cancelChan)
close(self.addProgressChan)
close(self.addDoneChan)
rhdl.Printf("session is now cleaned up")
}
func NewSession(ctx *ImportContext) (session *Session) {
session = new(Session)
session.state = SESSION_NEW
session.ctx = *ctx
session.done = make(chan bool)
session.cancelIntChan = make(chan bool, 1)
session.progressIntChan = make(chan ProgressData)
session.doneIntChan = make(chan ImportResult)
session.runChan = make(chan bool)
session.cancelChan = make(chan bool)
session.addProgressChan = make(chan sessionAddProgressHandlerRequest)
session.addDoneChan = make(chan sessionAddDoneHandlerRequest)
go session.dispatchRequests()
return
}
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