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main.go
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main.go
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package main
import (
"bytes"
"flag"
"log"
"os"
"runtime"
"time"
m "github.com/CasualSuperman/Diorite/multiverse"
)
var local = flag.Bool("local", false, "Connect to an update server running on localhost.")
var noserver = flag.Bool("noserver", false, "Don't start a web server.")
var keepserver = flag.Bool("keepserver", false, "Keep the server alive even if the page unloads.")
var playing = flag.Bool("playing", false, "Skip the main program and do whatever crazy thing you're working on at the moment.")
type exitSignal struct {
code int
reason string
}
func exit(es exitSignal) {
log.Println(es.reason)
os.Exit(es.code)
}
func main() {
flag.Parse()
runtime.GOMAXPROCS(runtime.NumCPU() * 8)
multiverseChan := make(chan *m.Multiverse)
exitChan := make(chan exitSignal)
multiverseDirAvailable := makeStorageDir()
var multiverse *m.Multiverse
if multiverseDirAvailable {
multiverse = loadMultiverse()
}
if !*playing {
server := NewServer(multiverse)
if !*noserver {
log.Println("Starting display server.")
go server.Serve(":7000", exitChan)
}
log.Println("Checking for updates.")
go watchForUpdates(multiverse, multiverseChan)
for {
select {
case multiverse = <-multiverseChan:
if !*noserver {
if multiverse != nil {
server.UpdateMultiverse(multiverse)
}
} else {
go func() {
exitChan <- exitSignal{0, "Exiting."}
}()
}
case code := <-exitChan:
exit(code)
}
}
}
}
func watchForUpdates(currMultiverse *m.Multiverse, ch chan *m.Multiverse) {
updateFrequency := time.Tick(5 * time.Minute)
for {
newMultiverse := downloadUpdates(currMultiverse)
if newMultiverse.Modified.After(currMultiverse.Modified) {
currMultiverse = newMultiverse
ch <- currMultiverse
} else {
ch <- nil
}
<-updateFrequency
}
}
func loadLocalMultiverse(location string) (m.Multiverse, error) {
multiverseFile, err := os.Open(location)
if err != nil {
return m.Multiverse{}, err
}
defer multiverseFile.Close()
return m.Read(multiverseFile)
}
func connectToServer() (serverConnection, error) {
if *local {
return connectToLocalServer()
} else {
return connectToDefaultServer()
}
}
func makeStorageDir() bool {
err := os.MkdirAll(StorageDir, os.ModePerm|os.ModeDir)
if err != nil {
log.Println("Unable to create application storage directory. Multiverse will not be saved.")
}
return err == nil
}
func loadMultiverse() *m.Multiverse {
log.Println("Loading local multiverse.")
multiverse, err := loadLocalMultiverse(MultiverseFileName)
if err != nil {
if os.IsNotExist(err) || os.IsPermission(err) {
log.Println("No local database available. A local copy will be downloaded.")
} else {
log.Printf("Unable to load multiverse: %s\n", err)
log.Println("Removing local multiverse.")
os.Remove(MultiverseFileName)
}
} else {
log.Println("Multiverse loaded.")
}
return &multiverse
}
func downloadUpdates(multiverse *m.Multiverse) *m.Multiverse {
log.Println("Contacting update server.")
server, err := connectToServer()
if err != nil {
if !multiverse.Loaded() {
log.Println("No local multiverse available, and unable to download copy. Unable to continue.")
} else {
log.Println("Warning: Online database unavailable. Your card index may be out of date.")
}
return multiverse
}
defer server.Close()
if multiverse.Loaded() {
log.Println("Checking for multiverse updates.")
} else {
log.Println("Downloading online multiverse.")
}
if multiverse.Loaded() && !server.Modified().After(multiverse.Modified) {
log.Println("No updates found.")
return multiverse
}
log.Println("Updates available. Downloading.")
data := server.RawMultiverse()
buf := bytes.NewBuffer(data)
newM, err := m.Read(buf)
if err != nil {
log.Printf("Error updating: %s\n", err)
if !multiverse.Loaded() {
log.Fatalln("Unable to load local multiverse and no download available. Exiting.")
} else {
log.Println("Unable to download most recent multiverse. Continuing with an out-of-date version.")
}
return multiverse
}
saveTo, err := os.Create(MultiverseFileName)
if err != nil {
log.Println("Unable to save update to multiverse. Continuing, but it will be redownloaded on next startup.")
return multiverse
}
_, err = saveTo.Write(data)
if err != nil && multiverse.Loaded() {
log.Println("Error saving multiverse. Rolling back changes.")
saveTo.Truncate(0)
multiverse.Write(saveTo)
saveTo.Close()
} else if err != nil {
log.Println("Error saving Multiverse. Removing.")
saveTo.Close()
os.Remove(MultiverseFileName)
}
log.Println("Multiverse downloaded!")
return &newM
}