// snapshotMap recursively walks expvar Maps and records their integer expvars
// in a separate flat map.
func snapshotMap(varsMap map[string]int64, path string, mp *expvar.Map) {
mp.Do(func(kv expvar.KeyValue) {
switch kv.Value.(type) {
case *expvar.Int:
varsMap[path+"."+kv.Key], _ = strconv.ParseInt(kv.Value.String(), 10, 64)
case *expvar.Map:
snapshotMap(varsMap, path+"."+kv.Key, kv.Value.(*expvar.Map))
}
})
}
func resetVarMap(varMap *expvar.Map) {
// There is no easy way to delete/clear expvar.Map. As such there is a slight
// race here. *sigh*
keys := []string{}
varMap.Do(func(kv expvar.KeyValue) {
keys = append(keys, kv.Key)
})
for _, key := range keys {
varMap.Set(key, new(expvar.Int))
}
}