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transformer.go
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transformer.go
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package domain
import (
logger "github.com/sirupsen/logrus"
"strconv"
"strings"
)
const (
errKeyMsg = "Error converting key to float: %s"
errValMsg = "Error converting value to float: %s"
)
func formatMapString(s string) string {
s = strings.Replace(s, " ", "", -1)
s = strings.TrimPrefix(s, "[")
s = strings.TrimSuffix(s, "]")
return s
}
func parseTransMap(s string) (map[float64]float64, error) {
m := make(map[float64]float64)
s = formatMapString(s)
for _, kv := range strings.Split(s, ",") {
kvSplit := strings.Split(kv, ":")
if len(kvSplit) == 2 {
key, errKey := strconv.ParseFloat(kvSplit[0], 64)
value, errVal := strconv.ParseFloat(kvSplit[1], 64)
if errKey != nil {
logger.Errorf(errKeyMsg, errKey)
return nil, errKey
}
if errVal != nil {
logger.Errorf(errValMsg, errVal)
return nil, errVal
}
m[key] = value
}
}
return m, nil
}
func parseDisplayMap(s string) (map[float64]string, error) {
m := make(map[float64]string)
s = formatMapString(s)
for _, kv := range strings.Split(s, ",") {
kvSplit := strings.Split(kv, ":")
if len(kvSplit) == 2 {
key, errKey := strconv.ParseFloat(kvSplit[0], 64)
value := kvSplit[1]
if errKey != nil {
logger.Errorf(errKeyMsg, errKey)
return nil, errKey
}
m[key] = value
}
}
return m, nil
}
func Transform(telem *TelemetryMessage, transVal TransformerValue) error {
transMap, err := parseTransMap(transVal.ValueType)
if err != nil {
return err
}
if val, ok := transMap[transVal.Value]; ok {
telem.SetValue(transVal.PointRef, val)
} else {
telem.SetValue(transVal.PointRef, transVal.Value)
}
return nil
}
func TransformDisplay(telemVal float64, strMap string) (string, error) {
displayMap, err := parseDisplayMap(strMap)
if err != nil {
return "", err
}
if val, ok := displayMap[telemVal]; ok {
return val, nil
}
return "", nil
}