Adding History API

[sconwayubb]

I haven't been able to test the Event Log History, since we don't use those in our environment. Also, the history.get endpoint doesn't return the ValueType like item.get does, so I left it as a string.

Usage:

sevenDaysAgo := time.Now().AddDate(0, 0, -7)

for _, i := range items {
	histories, err := api.GetHistories(zabbix.HistoryGetParams{
		ItemIDs:  []string{strconv.Itoa(i.ItemID)},
		TimeFrom: float64(sevenDaysAgo.Unix())})
	if len(histories) == 0 {
		fmt.Printf("%s - No history found\n", i.ItemName)
		continue
	}
        // do stuff with histories
}

[cavaliercoder]

Thanks for this!