func changeHandler(w http.ResponseWriter, r *http.Request, db *data.Database) {
datatypes := strings.Split(r.FormValue("key"), ",")
ids := strings.Split(r.FormValue("id"), ",")
channel, err := strconv.Atoi(r.FormValue("channel"))
if err != nil {
channel = 0
}
t, _ := computeTime(r.FormValue("time"))
var result struct {
Change []float64
}
unitmap := viper.GetStringMapString("units")
index := 0
for _, datatype := range datatypes {
for _, id := range ids {
if id == "" {
id = "%"
}
old, err := db.QueryFirst(t, datatype, id, channel)
if err != nil {
}
now, err := db.QueryLast(t, datatype, id, channel)
if err != nil {
}
value := now - old
var delta float64
delta = convertUnit(unitmap, r.FormValue("type"), value)
result.Change = append(result.Change, delta)
index++
}
}
json.NewEncoder(w).Encode(result)
}
