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path: root/src/helsinki.at/rhimport/session_store.go
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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 newSessionResponse struct {
	id      string
	session *SessionChan
	err     error
}

type newSessionRequest struct {
	ctx      *ImportContext
	response chan newSessionResponse
}

type getSessionResponse struct {
	session *SessionChan
	err     error
}

type getSessionRequest struct {
	user     string
	id       string
	response chan getSessionResponse
}

type removeSessionResponse struct {
	err error
}

type removeSessionRequest struct {
	user     string
	id       string
	response chan removeSessionResponse
}

type SessionStore struct {
	store      map[string]map[string]*Session
	quit       chan bool
	done       chan bool
	newChan    chan newSessionRequest
	getChan    chan getSessionRequest
	removeChan chan removeSessionRequest
}

func (self *SessionStore) new(ctx *ImportContext) (resp newSessionResponse) {
	if !ctx.Trusted {
		if ok, err := ctx.rddb.CheckPassword(ctx.UserName, ctx.Password); err != nil {
			resp.err = err
			return
		} else if !ok {
			resp.err = fmt.Errorf("invalid username and/or password")
			return
		}
	}
	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] = NewSession(ctx, func() { self.GetInterface().Remove(ctx.UserName, resp.id) })
	resp.session = self.store[ctx.UserName][resp.id].getInterface()
	rhdl.Printf("SessionStore: created session for '%s' -> %s", ctx.UserName, resp.id)
	return
}

func (self *SessionStore) get(user, id string) (resp getSessionResponse) {
	if session, exists := self.store[user][id]; exists {
		resp.session = session.getInterface()
	} else {
		resp.err = fmt.Errorf("SessionStore: session '%s/%s' not found", user, id)
	}
	return
}

func (self *SessionStore) remove(user, id string) (resp removeSessionResponse) {
	if session, exists := self.store[user][id]; exists {
		go session.Cleanup() // cleanup could take a while -> don't block all the other stuff
		delete(self.store[user], id)
		rhdl.Printf("SessionStore: removed session '%s/%s'", user, id)
		if userstore, exists := self.store[user]; exists {
			if len(userstore) == 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) dispatchRequests() {
	defer func() { self.done <- true }()
	for {
		select {
		case <-self.quit:
			return
		case req := <-self.newChan:
			req.response <- self.new(req.ctx)
		case req := <-self.getChan:
			req.response <- self.get(req.user, req.id)
		case req := <-self.removeChan:
			req.response <- self.remove(req.user, req.id)
		}
	}
}

// *********************************************************
// Public Interface

type SessionStoreChan struct {
	newChan    chan<- newSessionRequest
	getChan    chan<- getSessionRequest
	removeChan chan<- removeSessionRequest
}

func (self *SessionStoreChan) New(ctx *ImportContext) (string, *SessionChan, 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 "", nil, res.err
	}
	return res.id, res.session, nil
}

func (self *SessionStoreChan) Get(user, id string) (*SessionChan, error) {
	res_ch := make(chan getSessionResponse)
	req := getSessionRequest{}
	req.user = user
	req.id = id
	req.response = res_ch
	self.getChan <- req

	res := <-res_ch
	if res.err != nil {
		return nil, res.err
	}
	return res.session, nil
}

func (self *SessionStoreChan) Remove(user, id string) error {
	res_ch := make(chan removeSessionResponse)
	req := removeSessionRequest{}
	req.user = user
	req.id = id
	req.response = res_ch
	self.removeChan <- req

	res := <-res_ch
	return res.err
}

func (self *SessionStore) GetInterface() *SessionStoreChan {
	ch := &SessionStoreChan{}
	ch.newChan = self.newChan
	ch.getChan = self.getChan
	ch.removeChan = self.removeChan
	return ch
}

func (self *SessionStore) Cleanup() {
	self.quit <- true
	<-self.done
	close(self.quit)
	close(self.done)
	close(self.newChan)
	close(self.getChan)
	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, 10)
	store.getChan = make(chan getSessionRequest, 10)
	store.removeChan = make(chan removeSessionRequest, 10)

	go store.dispatchRequests()
	return
}