119 lines
3 KiB
Go
119 lines
3 KiB
Go
package wrapper
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import (
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"fmt"
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"sync"
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"time"
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"github.com/andig/evcc/api"
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"github.com/benbjohnson/clock"
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)
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// ChargeRater is responsible for providing charged energy amount
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// by implementing api.ChargeRater. It uses the charge meter's TotalEnergy or
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// keeps track of consumed energy by regularly updating consumed power.
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type ChargeRater struct {
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sync.Mutex
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clck clock.Clock
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name string
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meter api.Meter
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charging bool
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start time.Time
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startEnergy float64
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chargedEnergy float64
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}
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// NewChargeRater creates charge rater and initializes realtime clock
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func NewChargeRater(name string, meter api.Meter) *ChargeRater {
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return &ChargeRater{
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clck: clock.New(),
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name: name,
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meter: meter,
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}
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}
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// StartCharge records meter start energy. If meter does not supply TotalEnergy,
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// start time is recorded and charged energy set to zero.
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func (cr *ChargeRater) StartCharge() {
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cr.Lock()
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defer cr.Unlock()
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// time is needed if MeterEnergy is not supported
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cr.charging = true
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cr.start = cr.clck.Now()
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// get end energy amount
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if m, ok := cr.meter.(api.MeterEnergy); ok {
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if f, err := m.TotalEnergy(); err == nil {
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cr.startEnergy = f
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log.DEBUG.Printf("%s charge start energy: %.0fkWh", cr.name, f)
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} else {
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log.ERROR.Printf("%s charge meter error %v", cr.name, err)
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}
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} else {
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cr.chargedEnergy = 0
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}
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}
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// StopCharge records meter stop energy. If meter does not supply TotalEnergy,
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// stop time is recorded and accumulating energy though SetChargePower stopped.
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func (cr *ChargeRater) StopCharge() {
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cr.Lock()
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defer cr.Unlock()
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cr.charging = false
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// get end energy amount
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if m, ok := cr.meter.(api.MeterEnergy); ok {
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if f, err := m.TotalEnergy(); err == nil {
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cr.chargedEnergy = f - cr.startEnergy
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log.DEBUG.Printf("%s final charge energy: %.0fkWh", cr.name, cr.chargedEnergy)
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} else {
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log.ERROR.Printf("%s charge meter error %v", cr.name, err)
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}
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}
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}
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// SetChargePower increments consumed energy by amount in kWh since last update
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func (cr *ChargeRater) SetChargePower(power float64) {
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cr.Lock()
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defer cr.Unlock()
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if !cr.charging {
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return
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}
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// update energy amount if not provided by meter
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if _, ok := cr.meter.(api.MeterEnergy); !ok {
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// convert power to energy in kWh
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cr.chargedEnergy += power / 1e3 * float64(cr.clck.Since(cr.start)) / float64(time.Hour)
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// move timestamp
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cr.start = cr.clck.Now()
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}
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}
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// ChargedEnergy implements the ChargeRater interface.
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// It returns energy consumption since charge start in kWh.
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func (cr *ChargeRater) ChargedEnergy() (float64, error) {
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cr.Lock()
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defer cr.Unlock()
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// return previously charged energy
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if !cr.charging {
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return cr.chargedEnergy, nil
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}
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// get current energy amount
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if m, ok := cr.meter.(api.MeterEnergy); ok {
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f, err := m.TotalEnergy()
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if err == nil {
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return f - cr.startEnergy, nil
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}
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return 0, fmt.Errorf("%s charge meter error %v", cr.name, err)
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}
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// return charged energy sofar if meter is not used
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return cr.chargedEnergy, nil
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}
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