// Run runs the application in a loop until we're ready to finish
func (app *App) Run() {
logger.Println("app.Run()")
app.sigChan = make(chan os.Signal, 10) // 10 entries
signal.Notify(app.sigChan, syscall.SIGINT, syscall.SIGTERM)
eventChan := app.display.EventChan()
for !app.Finished() {
select {
case sig := <-app.sigChan:
fmt.Println("Caught signal: ", sig)
app.finished = true
case <-app.wi.WaitNextPeriod():
app.Collect()
app.Display()
if app.stdout {
app.setInitialFromCurrent()
}
case inputEvent := <-eventChan:
switch inputEvent.Type {
case event.EventAnonymise:
anonymiser.Enable(!anonymiser.Enabled()) // toggle current behaviour
case event.EventFinished:
app.finished = true
case event.EventViewNext:
app.displayNext()
case event.EventViewPrev:
app.displayPrevious()
case event.EventDecreasePollTime:
if app.wi.WaitInterval() > time.Second {
app.wi.SetWaitInterval(app.wi.WaitInterval() - time.Second)
}
case event.EventIncreasePollTime:
app.wi.SetWaitInterval(app.wi.WaitInterval() + time.Second)
case event.EventHelp:
app.SetHelp(!app.Help())
case event.EventToggleWantRelative:
app.ctx.SetWantRelativeStats(!app.ctx.WantRelativeStats())
app.Display()
case event.EventResetStatistics:
app.resetDBStatistics()
app.Display()
case event.EventResizeScreen:
width, height := inputEvent.Width, inputEvent.Height
app.display.Resize(width, height)
app.Display()
case event.EventError:
log.Fatalf("Quitting because of EventError error")
}
}
// provide a hook to stop the application if the counter goes down to zero
if app.stdout && app.count > 0 {
app.count--
if app.count == 0 {
app.finished = true
}
}
}
}
// NewApp sets up the application given various parameters.
func NewApp(settings Settings) *App {
logger.Println("app.NewApp()")
app := new(App)
anonymiser.Enable(settings.Anonymise) // not dynamic at the moment
app.dbh = settings.Conn.Handle()
status := global.NewStatus(app.dbh)
variables := global.NewVariables(app.dbh)
// Prior to setting up screen check that performance_schema is enabled.
// On MariaDB this is not the default setting so it will confuse people.
ensurePerformanceSchemaEnabled(variables)
app.ctx = context.NewContext(status, variables)
app.ctx.SetWantRelativeStats(true)
app.count = settings.Count
app.finished = false
app.stdout = settings.Stdout
app.display = settings.Disp
app.display.SetContext(app.ctx)
app.SetHelp(false)
if err := view.ValidateViews(app.dbh); err != nil {
log.Fatal(err)
}
logger.Println("app.Setup() Setting the default view to:", settings.View)
app.currentView.SetByName(settings.View) // if empty will use the default
app.setupInstruments = setup_instruments.NewSetupInstruments(app.dbh)
app.setupInstruments.EnableMonitoring()
app.wi.SetWaitInterval(time.Second * time.Duration(settings.Interval))
// setup to their initial types/values
logger.Println("app.NewApp() Setup models")
app.fsbi = fsbi.NewFileSummaryByInstance(app.ctx)
app.tiwsbt = tiwsbt.NewTableIoLatency(app.ctx)
app.tlwsbt = tlwsbt.NewTableLockLatency(app.ctx)
app.ewsgben = ewsgben.NewMutexLatency(app.ctx)
app.essgben = essgben.NewStagesLatency(app.ctx)
app.memory = memory_usage.NewMemoryUsage(app.ctx)
app.users = user_latency.NewUserLatency(app.ctx)
logger.Println("app.NewApp() Finished initialising models")
logger.Println("app.NewApp() fixLatencySetting()")
app.fixLatencySetting() // adjust to see ops/latency
logger.Println("app.NewApp() resetDBStatistics()")
app.resetDBStatistics()
logger.Println("app.NewApp() finishes")
return app
}