This repository has been archived by the owner on Feb 9, 2019. It is now read-only.
forked from RoboCup-SSL/ssl-game-controller
/
controller.go
165 lines (143 loc) · 3.83 KB
/
controller.go
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package controller
import (
"encoding/json"
"github.com/RoboCup-SSL/ssl-game-controller/pkg/timer"
"io"
"log"
"os"
"time"
)
const logDir = "logs"
const lastStateFileName = logDir + "/lastState.json"
const configFileName = "config/ssl-game-controller.yaml"
// GameController controls a game
type GameController struct {
Config Config
stateHistoryFile *os.File
lastStateFile *os.File
Publisher Publisher
ApiServer ApiServer
Engine Engine
timer timer.Timer
}
// NewGameController creates a new RefBox
func NewGameController() (r *GameController) {
r = new(GameController)
r.Config = loadConfig()
r.ApiServer = ApiServer{}
r.ApiServer.Consumer = r
r.Publisher = loadPublisher(r.Config)
r.Engine = NewEngine(r.Config.Game)
r.timer = timer.NewTimer()
r.timer.Start()
return
}
// Run the GameController by starting an endless loop in the background
func (r *GameController) Run() (err error) {
r.openStateFiles()
r.readLastState()
go func() {
if r.stateHistoryFile != nil {
defer r.stateHistoryFile.Close()
}
if r.lastStateFile != nil {
defer r.lastStateFile.Close()
}
for {
r.timer.WaitTillNextFullSecond()
r.Engine.Tick(r.timer.Delta())
r.publish(nil)
}
}()
return nil
}
func (r *GameController) OnNewEvent(event Event) {
cmd, err := r.Engine.Process(event)
if err != nil {
log.Println("Could not process event:", event, err)
} else {
r.publish(cmd)
}
}
func loadPublisher(config Config) Publisher {
publisher, err := NewPublisher(config.Publish.Address)
if err != nil {
log.Printf("Could not start publisher on %v. %v", config.Publish.Address, err)
}
return publisher
}
func loadConfig() Config {
config, err := LoadConfig(configFileName)
if err != nil {
log.Printf("Could not load config: %v", err)
}
return config
}
func (r *GameController) openStateFiles() {
os.MkdirAll(logDir, os.ModePerm)
stateHistoryLogFileName := logDir + "/state-history_" + time.Now().Format("2006-01-02_15-04-05") + ".log"
f, err := os.OpenFile(stateHistoryLogFileName, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
log.Fatal("Can not open state history log file", err)
}
r.stateHistoryFile = f
f, err = os.OpenFile(lastStateFileName, os.O_RDWR|os.O_CREATE, 0600)
if err != nil {
log.Fatal("Can not open last state file", err)
}
r.lastStateFile = f
}
func (r *GameController) readLastState() {
bufSize := 10000
b := make([]byte, bufSize)
n, err := r.lastStateFile.Read(b)
if err != nil && err != io.EOF {
log.Fatal("Could not read from last state file ", err)
}
if n == bufSize {
log.Fatal("Buffer size too small")
}
if n > 0 {
err = json.Unmarshal(b[:n], r.Engine.State)
if err != nil {
log.Fatalf("Could not read last state: %v %v", string(b), err)
}
}
}
// publish publishes the state to the UI and the teams
func (r *GameController) publish(command *EventCommand) {
r.saveLatestState()
if command != nil {
r.saveStateHistory()
}
r.ApiServer.PublishState(*r.Engine.State)
r.Publisher.Publish(r.Engine.State, command)
}
// saveLatestState writes the current state into a file
func (r *GameController) saveLatestState() {
jsonState, err := json.MarshalIndent(r.Engine.State, "", " ")
if err != nil {
log.Print("Can not marshal state ", err)
return
}
err = r.lastStateFile.Truncate(0)
if err != nil {
log.Fatal("Can not truncate last state file ", err)
}
_, err = r.lastStateFile.WriteAt(jsonState, 0)
if err != nil {
log.Print("Could not write last state ", err)
}
r.lastStateFile.Sync()
}
// saveStateHistory writes the current state to the history file
func (r *GameController) saveStateHistory() {
jsonState, err := json.Marshal(r.Engine.State)
if err != nil {
log.Print("Can not marshal state ", err)
return
}
r.stateHistoryFile.Write(jsonState)
r.stateHistoryFile.WriteString("\n")
r.stateHistoryFile.Sync()
}