125 lines
2.6 KiB
Go
125 lines
2.6 KiB
Go
package main
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import (
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"context"
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"errors"
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"flag"
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"fmt"
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"math"
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"net/http"
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"os"
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"os/signal"
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"sync"
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"time"
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"k8s.io/klog"
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)
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// daemon is the main state of the succdaemon.
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type daemon struct {
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// adcPirani is the adc implementation returning the voltage of the Pfeiffer
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// Pirani gauge.
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adcPirani adc
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// mu guards state variables below.
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mu sync.RWMutex
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// adcPiraniVolts is a moving window of read ADC values, used to calculate a
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// moving average.
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adcPiraniVolts []float32
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}
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// process runs the pain acquisition and control loop of succd.
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func (d *daemon) process(ctx context.Context) {
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ticker := time.NewTicker(time.Millisecond * 100)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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if err := d.processOnce(ctx); err != nil {
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if errors.Is(err, ctx.Err()) {
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return
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} else {
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klog.Errorf("Processing error: %v", err)
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time.Sleep(time.Second * 10)
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}
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}
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case <-ctx.Done():
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return
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}
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}
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}
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// processOnce runs the main loop step of succd.
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func (d *daemon) processOnce(_ context.Context) error {
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v, err := d.adcPirani.Read()
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if err != nil {
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return fmt.Errorf("when reading ADC: %w", err)
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}
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d.mu.Lock()
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d.adcPiraniVolts = append(d.adcPiraniVolts, v)
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trim := len(d.adcPiraniVolts) - 100
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if trim > 0 {
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d.adcPiraniVolts = d.adcPiraniVolts[trim:]
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}
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d.mu.Unlock()
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return nil
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}
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// pirani returns the Pirani gauge voltage and pressure.
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func (d *daemon) pirani() (volts float32, mbar float32) {
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d.mu.RLock()
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volts = 0.0
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for _, v := range d.adcPiraniVolts {
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volts += v
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}
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if len(d.adcPiraniVolts) != 0 {
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volts /= float32(len(d.adcPiraniVolts))
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}
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d.mu.RUnlock()
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// Per Pirani probe docs.
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bar := math.Pow(10.0, float64(volts)-8.5)
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mbar = float32(bar * 1000.0)
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return
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}
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var (
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flagFake bool
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flagListenHTTP string
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)
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func main() {
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flag.BoolVar(&flagFake, "fake", false, "Enable fake mode which allows to run succd for tests outside the succbone")
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flag.StringVar(&flagListenHTTP, "listen_http", ":8080", "Address at which to listen for HTTP requests")
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flag.Parse()
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ctx, _ := signal.NotifyContext(context.Background(), os.Interrupt)
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d := daemon{}
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if flagFake {
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klog.Infof("Starting with fake Pirani probe")
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d.adcPirani = &fakeADC{}
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} else {
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adc, err := newBBADC(0)
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if err != nil {
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klog.Exitf("Failed to setup Pirani ADC: %v", err)
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}
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d.adcPirani = adc
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}
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http.HandleFunc("/", d.httpIndex)
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http.HandleFunc("/stream", d.httpStream)
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http.HandleFunc("/metrics", d.httpMetrics)
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klog.Infof("Listening for HTTP at %s", flagListenHTTP)
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go func() {
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if err := http.ListenAndServe(flagListenHTTP, nil); err != nil {
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klog.Errorf("HTTP listen failed: %v", err)
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}
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}()
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go d.process(ctx)
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<-ctx.Done()
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}
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