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connector_core.go
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connector_core.go
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package ocpp
import (
"time"
"github.com/lorenzodonini/ocpp-go/ocpp1.6/core"
"github.com/lorenzodonini/ocpp-go/ocpp1.6/types"
)
// timestampValid returns false if status timestamps are outdated
func (conn *Connector) timestampValid(t time.Time) bool {
// reject if expired
if conn.clock.Since(t) > messageExpiry {
return false
}
// assume having a timestamp is better than not
if conn.status.Timestamp == nil {
return true
}
// reject older values than we already have
return t.After(conn.status.Timestamp.Time)
}
func (conn *Connector) StatusNotification(request *core.StatusNotificationRequest) (*core.StatusNotificationConfirmation, error) {
conn.mu.Lock()
defer conn.mu.Unlock()
if conn.status == nil {
conn.status = request
close(conn.statusC) // signal initial status received
} else if request.Timestamp == nil || conn.timestampValid(request.Timestamp.Time) {
conn.status = request
} else {
conn.log.TRACE.Printf("ignoring status: %s < %s", request.Timestamp.Time, conn.status.Timestamp)
}
return new(core.StatusNotificationConfirmation), nil
}
func (conn *Connector) MeterValues(request *core.MeterValuesRequest) (*core.MeterValuesConfirmation, error) {
conn.mu.Lock()
defer conn.mu.Unlock()
if request.TransactionId != nil && conn.txnId == 0 {
conn.log.DEBUG.Printf("hijacking transaction: %d", *request.TransactionId)
conn.txnId = *request.TransactionId
}
for _, meterValue := range request.MeterValue {
// ignore old meter value requests
if meterValue.Timestamp.Time.After(conn.meterUpdated) {
for _, sample := range meterValue.SampledValue {
conn.measurements[getSampleKey(sample)] = sample
conn.meterUpdated = conn.clock.Now()
}
}
}
return new(core.MeterValuesConfirmation), nil
}
func getSampleKey(s types.SampledValue) string {
if s.Phase != "" {
return string(s.Measurand) + "@" + string(s.Phase)
}
return string(s.Measurand)
}
func (conn *Connector) StartTransaction(request *core.StartTransactionRequest) (*core.StartTransactionConfirmation, error) {
conn.mu.Lock()
defer conn.mu.Unlock()
// expired request
if request.Timestamp != nil && conn.clock.Since(request.Timestamp.Time) > transactionExpiry {
res := &core.StartTransactionConfirmation{
IdTagInfo: &types.IdTagInfo{
Status: types.AuthorizationStatusExpired, // reject
},
}
return res, nil
}
conn.txnCount++
conn.txnId = conn.txnCount
res := &core.StartTransactionConfirmation{
IdTagInfo: &types.IdTagInfo{
Status: types.AuthorizationStatusAccepted,
},
TransactionId: conn.txnId,
}
return res, nil
}
func (conn *Connector) StopTransaction(request *core.StopTransactionRequest) (*core.StopTransactionConfirmation, error) {
conn.mu.Lock()
defer conn.mu.Unlock()
// expired request
if request.Timestamp != nil && conn.clock.Since(request.Timestamp.Time) > transactionExpiry {
res := &core.StopTransactionConfirmation{
IdTagInfo: &types.IdTagInfo{
Status: types.AuthorizationStatusExpired, // reject
},
}
return res, nil
}
conn.txnId = 0
res := &core.StopTransactionConfirmation{
IdTagInfo: &types.IdTagInfo{
Status: types.AuthorizationStatusAccepted, // accept
},
}
return res, nil
}