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hotswap_detector.go
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/
hotswap_detector.go
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package modules
import (
"context"
"time"
"github.com/pkg/errors"
"github.com/spf13/viper"
"github.com/timoth-y/chainmetric-iot/controllers/device"
"github.com/timoth-y/chainmetric-iot/core/dev/sensor"
"github.com/timoth-y/chainmetric-iot/core/io"
"github.com/timoth-y/chainmetric-iot/drivers/sensors"
"github.com/timoth-y/chainmetric-iot/model/events"
"github.com/timoth-y/chainmetric-iot/shared"
"github.com/timoth-y/go-eventdriver"
)
// HotswapDetector implements device.Module ofr detecting changes in connected to device.Device sensors.
type HotswapDetector struct {
moduleBase
detectedI2Cs io.I2CDetectResults
}
// WithHotswapDetector can be used to setup HotswapDetector logical device.Module onto the device.Device.
func WithHotswapDetector() device.Module {
return &HotswapDetector{
moduleBase: withModuleBase("HOTSWAP_DETECTOR"),
}
}
func (m *HotswapDetector) Start(ctx context.Context) {
go m.Do(func() {
var (
interval = viper.GetDuration("device.hotswap_detect_interval")
startTime time.Time
)
LOOP:
for {
startTime = time.Now()
if err := m.handleHotswap(ctx); err != nil {
shared.Logger.Error(errors.Wrap(err, "failed to handle hotswap"))
}
select {
case <- time.After(interval - time.Since(startTime)):
case <- ctx.Done():
shared.Logger.Debug("Hotswap detector module routine ended")
break LOOP
}
}
})
}
func (m *HotswapDetector) handleHotswap(ctx context.Context) error {
var (
detectedSensors = make(sensor.SensorsRegister)
registeredSensors = m.RegisteredSensors()
staticSensors = m.StaticSensors()
payload = events.SensorsRegisterChangedPayload{}
isChanges bool
)
m.detectedI2Cs = io.ScanI2C(sensors.I2CAddressesRange(), sensors.LocateI2CSensor)
for _, devices := range m.detectedI2Cs {
for _, s := range devices {
detectedSensors[s.ID()] = s
}
}
for id := range registeredSensors {
if !detectedSensors.Exists(id) && !m.contains(staticSensors, id) {
payload.Removed = append(payload.Removed, id)
isChanges = true
shared.Logger.Debugf("Hotswap: %s sensor was detached from the device", id)
}
}
for id := range detectedSensors {
if !registeredSensors.Exists(id) {
payload.Added = append(payload.Added, detectedSensors[id])
isChanges = true
shared.Logger.Debugf("Hotswap: %s sensor was attached to the device", id)
}
}
if isChanges {
eventdriver.EmitEvent(ctx, events.SensorsRegisterChanged, payload)
m.UpdateSensorsRegister(payload.Added, payload.Removed)
}
return nil
}
func (m *HotswapDetector) contains(register map[string]sensor.Sensor, id string) bool {
_, contains := register[id]
return contains
}