func (expr *PropertyExpression) Value(device datalayer.Device) (cloudvar.CloudVarValue, error) {
switch expr.property {
case "system.activity_status":
// -1 = never connected
// 0 = inactive
// 1 = active
last := device.LastActivityTime()
if last == nil {
return float64(-1), nil
} else if time.Now().UTC().Sub(*last) > time.Minute {
return float64(0), nil
}
return float64(1), nil
case "system.ws_connected":
return device.WSConnected(), nil
}
sample, err := device.LatestDataByName(expr.property)
if err != nil {
return nil, err
}
return sample.Value, nil
}
func deviceToJsonObj(device datalayer.Device, timestamp_type string) (map[string]interface{}, error) {
statusJsonObj := map[string]interface{}{
"ws_connected": device.WSConnected(),
}
lastSeen := device.LastActivityTime()
if lastSeen == nil {
statusJsonObj["last_activity_time"] = nil
} else {
if timestamp_type == "epoch_us" {
statusJsonObj["last_activity_time"] = canotime.EpochMicroseconds(*lastSeen)
} else {
statusJsonObj["last_activity_time"] = canotime.RFC3339(*lastSeen)
}
}
out := map[string]interface{}{
"device_id": device.ID().String(),
"friendly_name": device.Name(),
"location_note": device.LocationNote(),
"status": statusJsonObj,
"var_decls": nil,
"secret_key": device.SecretKey(),
"vars": map[string]interface{}{},
"notifs": []interface{}{},
}
sddlDoc := device.SDDLDocument()
if sddlDoc != nil {
out["var_decls"] = sddlDoc.Json()
}
outDoc := device.SDDLDocument()
if outDoc != nil {
// get most recent value of each sensor/control
for _, varDef := range outDoc.VarDefs() {
sample, err := device.LatestDataByName(varDef.Name())
if err != nil {
continue
}
if timestamp_type == "epoch_us" {
out["vars"].(map[string]interface{})[varDef.Name()] = map[string]interface{}{
"t": canotime.EpochMicroseconds(sample.Timestamp),
"v": sample.Value,
}
} else {
out["vars"].(map[string]interface{})[varDef.Name()] = map[string]interface{}{
"t": canotime.RFC3339(sample.Timestamp),
"v": sample.Value,
}
}
}
// Generate JSON for notifications
//
/*notifications, err := device.HistoricNotifications()
canolog.Info("Reading notifications")
if err != nil {
canolog.Info("Error reading notifications %s", err)
return nil, err
}
outNotifications := []jsonNotification{};
for _, notification := range notifications {
outNotifications = append(
outNotifications,
jsonNotification{
notification.Datetime().Format(time.RFC3339),
notification.IsDismissed(),
notification.Msg(),
})
}*/
}
return out, nil
}