func HistoryJson(u utils.Utils, w http.ResponseWriter, r *http.Request) {
requestedUrls := parseUrls(r)
url := requestedUrls[0]
records, err := u.HistoryLoad(url)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
u.Errorf("web.HistoryJson: HistoryLoad error %v", err)
return
}
data := make(map[string]HistorySlot)
slotSize := int64(300) // each slot lasts 5 minutes
for _, record := range records {
slotInt64 := record.Time.Unix() / slotSize * slotSize
slotString := fmt.Sprintf("%d", slotInt64)
if slot, ok := data[slotString]; ok {
if _, ok := slot.Counts[record.Service]; !ok {
slot.Counts[record.Service] = record.Count
slot.Total += record.Count
data[slotString] = slot
}
} else {
data[slotString] = HistorySlot{
Time: time.Unix(slotInt64, 0).Format(time.RFC1123),
Counts: map[string]int64{record.Service: record.Count},
Total: record.Count,
}
}
}
historyJson, err := json.Marshal(data)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
u.Errorf("web.HistoryJson: json.Marshal error %v", err)
return
}
writeJson(u, w, r, string(historyJson))
}