| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package powerdns_recursor |
| 4 | |
| 5 | import ( |
| 6 | "errors" |
| 7 | "strconv" |
| 8 | |
| 9 | "github.com/netdata/netdata/go/plugins/pkg/web" |
| 10 | ) |
| 11 | |
| 12 | const ( |
| 13 | urlPathLocalStatistics = "/api/v1/servers/localhost/statistics" |
| 14 | ) |
| 15 | |
| 16 | func (c *Collector) collect() (map[string]int64, error) { |
| 17 | statistics, err := c.scrapeStatistics() |
| 18 | if err != nil { |
| 19 | return nil, err |
| 20 | } |
| 21 | |
| 22 | collected := make(map[string]int64) |
| 23 | |
| 24 | c.collectStatistics(collected, statistics) |
| 25 | |
| 26 | if !isPowerDNSRecursorMetrics(collected) { |
| 27 | return nil, errors.New("returned metrics aren't PowerDNS Recursor metrics") |
| 28 | } |
| 29 | |
| 30 | return collected, nil |
| 31 | } |
| 32 | |
| 33 | func isPowerDNSRecursorMetrics(collected map[string]int64) bool { |
| 34 | // PowerDNS Authoritative Server has same endpoint and returns data in the same format. |
| 35 | _, ok1 := collected["over-capacity-drops"] |
| 36 | _, ok2 := collected["tcp-questions"] |
| 37 | return ok1 && ok2 |
| 38 | } |
| 39 | |
| 40 | func (c *Collector) collectStatistics(collected map[string]int64, statistics statisticMetrics) { |
| 41 | for _, s := range statistics { |
| 42 | // https://doc.powerdns.com/authoritative/http-api/statistics.html#statisticitem |
| 43 | if s.Type != "StatisticItem" { |
| 44 | continue |
| 45 | } |
| 46 | |
| 47 | value, ok := s.Value.(string) |
| 48 | if !ok { |
| 49 | c.Debugf("%s value (%v) unexpected type: want=string, got=%T.", s.Name, s.Value, s.Value) |
| 50 | continue |
| 51 | } |
| 52 | |
| 53 | v, err := strconv.ParseInt(value, 10, 64) |
| 54 | if err != nil { |
| 55 | c.Debugf("%s value (%v) parse error: %v", s.Name, s.Value, err) |
| 56 | continue |
| 57 | } |
| 58 | |
| 59 | collected[s.Name] = v |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | func (c *Collector) scrapeStatistics() ([]statisticMetric, error) { |
| 64 | req, _ := web.NewHTTPRequestWithPath(c.RequestConfig, urlPathLocalStatistics) |
| 65 | |
| 66 | var stats statisticMetrics |
| 67 | if err := web.DoHTTP(c.httpClient).RequestJSON(req, &stats); err != nil { |
| 68 | return nil, err |
| 69 | } |
| 70 | |
| 71 | return stats, nil |
| 72 | } |