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//
// sfive
//
// sfive - spreadspace streaming statistics suite is a generic
// statistic collection tool for streaming server infrastuctures.
// The system collects and stores meta data like number of views
// and throughput from a number of streaming servers and stores
// it in a global data store.
// The data acquisition is designed to be generic and extensible in
// order to support different streaming software.
// sfive also contains tools and applications to filter and visualize
// live and recorded data.
//
//
// Copyright (C) 2014-2017 Christian Pointner <equinox@spreadspace.org>
// Markus Grüneis <gimpf@gimpf.org>
//
// This file is part of sfive.
//
// sfive is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3
// as published by the Free Software Foundation.
//
// sfive 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 sfive. If not, see <http://www.gnu.org/licenses/>.
//
package sfive
import (
"time"
)
type appendManyToken struct {
data []DataUpdateFull
response chan bool
}
type getUpdatesResult struct {
values []DataUpdateFull
err error
}
type getUpdatesAfterToken struct {
id int
limit int
response chan getUpdatesResult
}
type getHubIdResult struct {
id string
}
type getHubIdToken struct {
response chan getHubIdResult
}
type getLastUpdateIdResult struct {
id int
err error
}
type getLastUpdateIdToken struct {
response chan getLastUpdateIdResult
}
type Server struct {
store Store
quit chan bool
done chan bool
appendData chan DataUpdateFull
appendManyData chan appendManyToken
getUpdatesAfterChan chan getUpdatesAfterToken
getHubIdChan chan getHubIdToken
getLastUpdateIdChan chan getLastUpdateIdToken
}
func (srv Server) appendActor() {
defer func() { srv.done <- true }()
for {
select {
case <-srv.quit:
return
case value := <-srv.appendData:
var err error
for tryNum := 0; tryNum < 5; tryNum++ {
err = srv.store.Append(value)
if err != nil {
time.Sleep(1 * time.Second)
} else {
break
}
}
if err != nil {
s5l.Printf("server: failed to store data: %v\n", err)
}
case token := <-srv.appendManyData:
err := srv.store.AppendMany(token.data)
if err != nil {
s5l.Printf("server: failed to store many data: %v\n", err)
token.response <- false
} else {
token.response <- true
}
case token := <-srv.getUpdatesAfterChan:
values, err := srv.store.GetUpdatesAfter(token.id, token.limit)
token.response <- getUpdatesResult{values, err}
case token := <-srv.getHubIdChan:
token.response <- getHubIdResult{srv.store.GetStoreId()}
case token := <-srv.getLastUpdateIdChan:
lastUpdateId, err := srv.store.GetLastUpdateId()
token.response <- getLastUpdateIdResult{lastUpdateId, err}
}
}
}
func (srv Server) GetUpdatesAfter(id, limit int) ([]DataUpdateFull, error) {
token := getUpdatesAfterToken{id: id, limit: limit, response: make(chan getUpdatesResult, 1)}
defer close(token.response)
srv.getUpdatesAfterChan <- token
res := <-token.response
return res.values, res.err
}
func (srv Server) GetHubId() string {
token := getHubIdToken{response: make(chan getHubIdResult, 1)}
defer close(token.response)
srv.getHubIdChan <- token
res := <-token.response
return res.id
}
func (srv Server) GetLastUpdateId() (int, error) {
token := getLastUpdateIdToken{response: make(chan getLastUpdateIdResult, 1)}
defer close(token.response)
srv.getLastUpdateIdChan <- token
res := <-token.response
return res.id, res.err
}
func (srv Server) Close() {
s5l.Printf("server: shutting down\n")
srv.quit <- true
<-srv.done
close(srv.quit)
close(srv.done)
close(srv.appendData)
close(srv.appendManyData)
close(srv.getUpdatesAfterChan)
close(srv.getHubIdChan)
close(srv.getLastUpdateIdChan)
srv.store.Close()
s5l.Printf("server: finished\n")
}
func NewServer(dbPath string) (server *Server, err error) {
// TODO read configuration and create instance with correct settings
server = new(Server)
server.store, err = NewStore(dbPath)
if err != nil {
return
}
server.quit = make(chan bool)
server.done = make(chan bool)
server.appendData = make(chan DataUpdateFull, 5)
server.appendManyData = make(chan appendManyToken, 5)
server.getUpdatesAfterChan = make(chan getUpdatesAfterToken, 1)
server.getHubIdChan = make(chan getHubIdToken, 1)
server.getLastUpdateIdChan = make(chan getLastUpdateIdToken, 1)
go server.appendActor()
s5l.Printf("server: started\n")
return
}
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