151 lines
3.8 KiB
Go
151 lines
3.8 KiB
Go
package main
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import (
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"fmt"
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"os"
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"os/signal"
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"os/user"
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"syscall"
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"time"
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_ "time/tzdata"
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"git.fjla.uk/owlboard/timetable-mgr/background"
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"git.fjla.uk/owlboard/timetable-mgr/cif"
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"git.fjla.uk/owlboard/timetable-mgr/corpus"
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"git.fjla.uk/owlboard/timetable-mgr/dbAccess"
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"git.fjla.uk/owlboard/timetable-mgr/helpers"
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"git.fjla.uk/owlboard/timetable-mgr/log"
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"git.fjla.uk/owlboard/timetable-mgr/messaging"
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"git.fjla.uk/owlboard/timetable-mgr/pis"
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"git.fjla.uk/owlboard/timetable-mgr/stations"
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"git.fjla.uk/owlboard/timetable-mgr/vstp"
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"go.uber.org/zap"
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)
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const (
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bold = "\033[1m"
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redB = "\033[1;31m"
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blue = "\033[32m" //Actually green!
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cyan = "\033[36m"
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reset = "\033[0m"
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)
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func init() {
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printStartupBanner()
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fmt.Printf("%sVersion %s \n\n%s", bold+blue, helpers.Version, reset)
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// Exits is being run as root
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// not necessary and not secure
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checkRunAsRoot()
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}
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func main() {
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log.InitLogger()
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defer log.Cleanup()
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log.Info("Initialising OwlBoard timetable-mgr", zap.String("version", helpers.Version))
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cfg, err := helpers.LoadConfig()
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if err != nil {
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log.Fatal("Unable to load configuration", zap.Error(err))
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return
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}
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cfg.PrintConfig()
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dbAccess.InitDataAccess(cfg)
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dbAccess.PushVersionToDb()
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// Initialise a `stop` channel to signal goroutines to cleanup
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stop := make(chan struct{})
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// Start CIF Task Ticker
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background.InitTicker(cfg, stop)
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// Handle signals from the OS
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go handleSignals(cfg, stop)
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// Manually call CIF and CORPUS checks to ensure that they are
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// not delayed until the first ticker event.
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go cif.CheckCif(cfg)
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go corpus.CheckCorpus(cfg)
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go stations.Check()
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go pis.Check()
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if cfg.VstpOn {
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messaging.StompInit(cfg)
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vstp.Subscribe()
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}
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<-stop
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}
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// Traps SIGINT and SIGTERM signals and ensures cleanup() is run
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func handleSignals(cfg *helpers.Configuration, stop chan<- struct{}) {
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sigChan := make(chan os.Signal, 1)
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signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
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sig := <-sigChan
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log.Warn("Signal received: " + sig.String())
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cleanup(cfg, stop)
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}
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// Cleans up open connections ready for a clean exit of the program
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func cleanup(cfg *helpers.Configuration, stop chan<- struct{}) {
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log.Debug("Cleaning up open connections")
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if cfg.VstpOn {
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log.Info("Closing STOMP Client")
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messaging.Disconnect(messaging.Client)
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}
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if dbAccess.MongoClient != nil {
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log.Info("Closing MongoDB Client")
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dbAccess.CloseMongoClient()
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}
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log.Info("Signalling to other goroutines")
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close(stop)
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log.Info("Program ready to exit")
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time.Sleep(500 * time.Millisecond)
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log.Cleanup()
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os.Exit(0)
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}
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func printStartupBanner() {
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art := `
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___ _ ____ _
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/ _ \__ _| | __ ) ___ __ _ _ __ __| |
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| | | \ \ /\ / / | _ \ / _ \ / _' | '__/ _' |
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| |_| |\ V V /| | |_) | (_) | (_| | | | (_| |
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\___/ \_/\_/ |_|____/ \___/ \__,_|_| \__,_|
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_ _ _ _ _
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| |_(_)_ __ ___ ___| |_ __ _| |__ | | ___ _ __ ___ __ _ _ __
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| __| | '_ ' _ \ / _ \ __/ _' | '_ \| |/ _ \_____| '_ ' _ \ / _' | '__|
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| |_| | | | | | | __/ || (_| | |_) | | __/_____| | | | | | (_| | |
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\__|_|_| |_| |_|\___|\__\__,_|_.__/|_|\___| |_| |_| |_|\__, |_|
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|___/
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`
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fmt.Println(cyan + art + reset)
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}
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func checkRunAsRoot() {
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uid := os.Getuid()
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if uid != 0 {
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currUser, err := user.Current()
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var msg string
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if err != nil {
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msg = "Unable to determine which user is running the application."
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} else {
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msg = fmt.Sprintf("Running as user: %s, %s", currUser.Uid, currUser.Username)
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}
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fmt.Println(blue + msg + "\nRunning as non-root user" + reset)
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return
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}
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fmt.Println(redB + "This program must not be run as the root user" + reset)
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fmt.Println("")
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os.Exit(1)
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}
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